U.S. patent application number 12/653219 was filed with the patent office on 2010-04-15 for devices, systems, and methods for prosthesis delivery and implantation.
This patent application is currently assigned to APTUS ENDOSYSTEMS, INC.. Invention is credited to Lee Bolduc, Gilbert Laroya, Joshua Stafford.
Application Number | 20100094400 12/653219 |
Document ID | / |
Family ID | 37962965 |
Filed Date | 2010-04-15 |
United States Patent
Application |
20100094400 |
Kind Code |
A1 |
Bolduc; Lee ; et
al. |
April 15, 2010 |
Devices, systems, and methods for prosthesis delivery and
implantation
Abstract
Devices, systems, and methods use a catheter device sized and
configured for introduction to a targeted site in a hollow body
organ or blood vessel. The catheter device includes a first release
mechanisms coupled to the prosthesis to secure at least one region
of the prosthesis to the catheter shaft, and a second release
mechanism coupled to the prosthesis in cooperation with the first
release mechanism to prevent full release of the at least one
region of the at least one region of the prosthesis from the
catheter shaft after actuation of the first release mechanism. A
fastening device sized and configured for introduction to the
targeted site in the hollow body organ or blood vessel occupied by
the catheter device, includes an actuator to deploy a fastener in
the at least one region of the prosthesis after actuation of the
first release mechanism and before actuation of the second release
mechanism.
Inventors: |
Bolduc; Lee; (Sunnyvale,
CA) ; Laroya; Gilbert; (Santa Clara, CA) ;
Stafford; Joshua; (Menlo Park, CA) |
Correspondence
Address: |
Daniel D. Ryan;RYAN KROMHOLZ & MANION, S.C.
Post Office Box 26618
Milwaukee
WI
53226-0618
US
|
Assignee: |
APTUS ENDOSYSTEMS, INC.
|
Family ID: |
37962965 |
Appl. No.: |
12/653219 |
Filed: |
December 10, 2009 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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11255116 |
Oct 20, 2005 |
7637932 |
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12653219 |
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11254619 |
Oct 20, 2005 |
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11255116 |
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10692283 |
Oct 23, 2003 |
7147657 |
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11254619 |
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10786465 |
Feb 25, 2004 |
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11255116 |
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11166428 |
Jun 24, 2005 |
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10786465 |
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10693255 |
Oct 24, 2003 |
6929661 |
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11166428 |
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10307226 |
Nov 29, 2002 |
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11255116 |
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10669881 |
Sep 24, 2003 |
7491232 |
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10307226 |
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11166411 |
Jun 24, 2005 |
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10669881 |
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10271334 |
Oct 15, 2002 |
6960217 |
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11166411 |
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60488753 |
Jul 21, 2003 |
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60489011 |
Jul 21, 2003 |
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60333937 |
Nov 28, 2001 |
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Current U.S.
Class: |
623/1.11 |
Current CPC
Class: |
A61B 17/064 20130101;
A61B 2017/003 20130101; A61B 2017/0649 20130101; A61B 17/00234
20130101; A61M 2025/015 20130101; A61B 17/0401 20130101; A61B
17/3415 20130101; A61B 17/3468 20130101; A61M 25/0147 20130101;
A61B 17/068 20130101; A61B 2017/00327 20130101; A61M 25/0136
20130101; A61B 2017/0409 20130101; A61B 2017/0441 20130101; A61B
2090/3966 20160201 |
Class at
Publication: |
623/1.11 |
International
Class: |
A61F 2/84 20060101
A61F002/84 |
Claims
1. A method comprising providing a prosthesis including a proximal
region and a distal region, each of the proximal and distal regions
being sized and configured for self-expansion between a radially
compressed condition and a radially expanded condition, providing a
deployment catheter including a shaft sized and configured to carry
the prosthesis, a first proximal release mechanism coupling the
proximal region of the prosthesis to the shaft to retain the
proximal region in the radially compressed condition, a second
proximal release mechanism coupling the proximal region of the
prosthesis to the shaft, independent of the first proximal release
mechanism, to retain the proximal region coupled to the shaft while
the proximal region is in the radially expanded condition, and a
distal release mechanism, independent of the first and second
proximal release mechanisms, coupling the distal region of the
prosthesis to the shaft to retain the distal region the radially
compressed condition, providing a guide device separate from the
deployment catheter, the guide device defining a guide passage,
providing a fastener device separate from the guide device and the
deployment catheter and being sized and configured to pass through
the guide passage, the fastener device carrying at least one
fastener, positioning the deployment catheter at a targeted site in
a hollow body organ or blood vessel, the first proximal release
mechanism and the distal release mechanisms of the deployment
catheter retaining the proximal and distal regions of the
prosthesis, respectively, in the radially compressed condition,
actuating the first proximal release mechanism and not the second
proximal release mechanism and not the distal release mechanism to
release the proximal region of the prosthesis for self-expansion
from the radially compressed condition to the radially expanded
condition, thereby allowing adjustment of a position of the
prosthesis, while the proximal region is in the radially expanded
condition, relative to the targeted site by manipulation of the
deployment catheter, deploying the guide device into the proximal
region while the proximal region is in the radially expanded
condition, deploying the fastener device through the guide passage
of the guide device into the proximal region while the proximal
region is in the radially expanded condition, operating the
fastener device to apply the fastener to fasten the proximal region
of the prosthesis to the targeted site while the proximal region is
in the radially expanded condition, after applying the fastener,
actuating the second proximal release mechanism to release the
proximal region of the prosthesis from the deployment catheter, and
actuating the distal release mechanism to allow the distal region
of the prosthesis to self expand from the radially compressed
condition to the radially expanded condition.
2. A method according to claim 1 further comprising, after
actuating the first proximal release mechanism and before applying
the fastener, manipulating the deployment catheter to adjust a
position of the prosthesis either longitudinally and/or
rotationally relative to the targeted site.
3. A method according to claim 1 wherein the deployment catheter
includes an interlock mechanism to prevent actuation of the second
proximal release mechanism before actuation of the first proximal
release mechanism.
4. A method according to claim 1 wherein the prosthesis is
longitudinally compliant.
Description
RELATED APPLICATIONS
[0001] This application is a continuation of co-pending U.S. patent
application Ser. No. 11/255,116, filed Oct. 20, 2005, which is a
continuation-in-part of (i) U.S. patent application Ser. No.
11/254,619 filed Oct. 20, 2005, and entitled "Devices, Systems, and
Methods for Guiding an Operative Tool Into an Interior Body
Region," which is incorporated herein by reference; (ii) U.S.
patent application Ser. No. 10/692,283, filed Oct. 23, 2003, and
entitled "Prosthesis Delivery Systems and Methods," which claims
the benefit of U.S. Provisional Patent Application Ser. No.
60/488,753, filed Jul. 21, 2003, and entitled "Endoprosthesis
Delivery Systems and Methods"; (iii) U.S. patent application Ser.
No. 10/786,465, filed Feb. 25, 2004, and entitled "Systems and
Methods for Attaching a Prosthesis Within a Body Lumen or Hollow
Organ"; (iv) U.S. patent application Ser. No. 11/166,428, filed
Jun. 24, 2005, entitled "Multi-Lumen Prosthesis Systems and
Methods," which is a division of U.S. patent application Ser. No.
10/693,255, filed 24 Oct. 2003 (now U.S. Pat. No. 6,929,661), which
claims the benefit of U.S. Provisional Patent Application Ser. No.
60/489,011, filed Jul. 21, 2003, and entitled "Bifurcated
Prosthesis Systems and Methods"; (v) U.S. patent application Ser.
No. 10/307,226, filed 29 Nov. 2002, and entitled "Intraluminal
Prosthesis Attachment Systems, and Methods"; (vi) U.S. patent
application Ser. No. 10/669,881, entitled "Catheter-Based Fastener
Implantation Apparatus and Methods with Implantation Force
Resolution"; (vii) U.S. patent application Ser. No. 11/166,411,
filed Jun. 24, 2005, entitled "Endovascular Aneurysm Repair
System," which is a division of U.S. patent application Ser. No.
10/271,334, filed 15 Oct. 2002 (now U.S. Pat. No. 6,960,217), which
claims the benefit of U.S. Provisional Patent Application Ser. No.
60/333,937, filed 28 Nov. 2001, and entitled "Endovascular Aneurysm
Repair System." Each of the preceding applications is incorporated
herein by reference.
FIELD OF THE INVENTION
[0002] The invention relates generally to devices, systems, and
methods for the delivery and implantation of a prosthesis to a
targeted site within the body, e.g., for the repair of diseased
and/or damaged sections of a hollow body organ and/or blood
vessel.
BACKGROUND OF THE INVENTION
[0003] The weakening of a vessel wall from damage or disease can
lead to vessel dilatation and the formation of an aneurysm. Left
untreated, an aneurysm can grow in size and may eventually
rupture.
[0004] For example, aneurysms of the aorta primarily occur in the
abdominal region, usually in the infrarenal area between the renal
arteries and the aortic bifurcation. Aneurysms can also occur in
the thoracic region between the aortic arch and renal arteries. The
rupture of an aortic aneurysm results in massive hemorrhaging and
has a high rate of mortality.
[0005] Open surgical replacement of a diseased or damaged section
of vessel can eliminate the risk of vessel rupture. In this
procedure, the diseased or damaged section of vessel is removed and
a prosthetic prosthesis, made either in a straight or bifurcated
configuration, is installed and then permanently attached and
sealed to the ends of the native vessel by suture. The prosthetic
prosthesis for these procedures are usually unsupported woven tubes
and are typically made from polyester, ePTFE or other suitable
materials. The prosthesis are longitudinally unsupported so they
can accommodate changes in the morphology of the aneurysm and
native vessel. However, these procedures require a large surgical
incision and have a high rate of morbidity and mortality. In
addition, many patients are unsuitable for this type of major
surgery due to other co-morbidities.
[0006] Endovascular aneurysm repair has been introduced to overcome
the problems associated with open surgical repair. The aneurysm is
bridged with a vascular prosthesis, which is placed intraluminally.
Typically these prosthetic prostheses for aortic aneurysms are
delivered collapsed on a catheter through the femoral artery. These
prostheses are usually designed with a fabric material attached to
a metallic scaffolding (stent) structure, which expands or is
expanded to contact the internal diameter of the vessel. Unlike
open surgical aneurysm repair, intraluminally deployed prostheses
are not sutured to the native vessel, but rely on either barbs
extending from the stent, which penetrate into the native vessel
during deployment, or the radial expansion force of the stent
itself is utilized to hold the prosthesis in position. These
prosthesis attachment means do not provide the same level of
attachment when compared to suture and can damage the native vessel
upon deployment.
[0007] Accordingly, there is a need for improved prosthesis
delivery devices, systems, and methods that deliver a prosthetic
graft to a body lumen, the prosthesis being able to adapt to
changes in aneurysm morphology and able to be deployed safely and
without damage to the native vessel.
SUMMARY OF THE INVENTION
[0008] The devices, systems, and methods for delivering and
implanting radially expandable prostheses in the body lumens and
hollow body organ are described. In particular, the present
invention provides improved devices, systems, and methods for
implanting vascular prostheses into blood vessels, including both
arterial and venous systems. In the exemplary embodiments,
prostheses are placed in vasculature to reinforce aneurysms,
particularly abdominal aortic aneurysms.
[0009] According to one aspect of the invention, devices, systems
and methods position a deployment catheter at a targeted site in a
hollow body organ or blood vessel. The deployment catheter carries
an expandable endovascular prosthesis. The devices, systems and
methods actuate a first release mechanism on the deployment
catheter to allow at least some expansion of at least one region of
the prosthesis at the targeted site without fully releasing the one
region of the prosthesis from the deployment catheter. After
actuating the first release mechanism, the devices, systems and
methods apply a fastener to fasten the at least one region of the
prosthesis to the targeted site. After applying the fastener, the
devices, systems and methods actuate a second release mechanism on
the deployment catheter to fully release the at least one region of
the prosthesis from the deployment catheter.
[0010] According to another aspect of the invention, devices,
systems and methods position a deployment catheter at a targeted
site in a hollow body organ or blood vessel. The deployment
catheter carries an expandable endovascular prosthesis. The
devices, systems and methods actuate a first release mechanism on
the deployment catheter to allow at least some expansion of the
proximal region of the prosthesis at the targeted site without
fully releasing the proximal end of the prosthesis from the
deployment catheter. After actuating the first release mechanism,
the devices, systems and methods apply a fastener to fasten the
proximal end the prosthesis to the targeted site. After applying
the fastener, the devices, systems and methods actuate, a second
release mechanism on the deployment catheter to fully release the
proximal end of the prosthesis from the deployment catheter. After
applying the fastener, the devices, systems and methods actuate a
third release mechanism on the deployment catheter to fully release
the distal end of the prosthesis from the deployment catheter.
[0011] The devices, systems, and methods make possible longitudinal
and/or rotational adjustment of the position and orientation of the
prosthesis before prior to applying a fastener. The devices,
systems, and methods also make possible retaining control of the
prosthesis, both proximally and distally, while a fastener is
applied.
[0012] Other features and advantages of the invention shall be
apparent based upon the accompanying description, drawings, and
claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] FIG. 1 is a perspective view of one embodiment of a
prosthesis deployment catheter shown positioned within an abdominal
aortic aneurysm.
[0014] FIG. 2 is a perspective view of one embodiment of the
deployment of a prosthesis within the aneurysm of FIG. 1, with the
jacket partially retracted.
[0015] FIG. 3 is a perspective view of one embodiment of the
deployment of a prosthesis within the aneurysm of FIG. 1, with the
jacket fully retracted and showing radial expansion of the proximal
end.
[0016] FIG. 4 is a perspective view of one embodiment of the
completed deployment of a multi-lumen prosthesis within the
aneurysm of FIG. 1.
[0017] FIG. 5 is a perspective view of an alternative embodiment of
the completed deployment of a single, lumen prosthesis within the
aneurysm of FIG. 1.
[0018] FIG. 6 is a side view of the multi-lumen prosthesis assembly
that embodies features of the invention, the multi-lumen prosthesis
assembly shown with lumen extensions.
[0019] FIG. 7A is a side view of the main body component of the
multi-lumen prosthesis assembly.
[0020] FIG. 7B is an enlarged view showing detail of the distal
stent curved apices of the multi-lumen prosthesis shown in FIG.
7A.
[0021] FIG. 7C is a side view of one embodiment of the prosthesis
septum, showing stitches and weaving to form the septum.
[0022] FIG. 7D is a side view of an alternative embodiment of the
main body component of the multi-lumen prosthesis assembly of FIG.
7A, showing the main body prosthesis having a second lumen
extending beyond the first lumen.
[0023] FIG. 8A is a section view of the distal end of the main body
component of the multi-lumen prosthesis taken generally along line
8A-8A of FIG. 6.
[0024] FIG. 8B is a section view of the proximal end of the main
body component of the multi-lumen prosthesis taken generally along
line 8B-8B of FIG. 6.
[0025] FIG. 9A is a side view of a prosthesis lumen extension.
[0026] FIG. 9B is an enlarged view showing detail of the securing
stent curved apices of the lumen extension shown in FIG. 9A.
[0027] FIG. 9C is a side view of one extension lumen coupled to the
main body component of the multi-lumen prosthesis.
[0028] FIG. 9D is an enlarged view showing detail of the curved
apices of both the securing stent of the lumen extension coupled to
the distal stent of the main body prosthesis, as shown in FIG.
9C.
[0029] FIG. 10A is a side view of an alternative embodiment of the
prosthesis lumen extension of FIG. 9A, and shows securing stents
without deflected apices.
[0030] FIG. 10B is an enlarged view showing detail of the securing
stents of the lumen extension shown in FIG. 10A.
[0031] FIG. 10C is a side view showing the alternative embodiment
of the prosthesis lumen extension of FIG. 10A coupled to the main
body component of the multi-lumen prosthesis.
[0032] FIG. 10D is an enlarged view showing detail of the securing
stents of the alternative embodiment of the lumen extension coupled
to the distal stent of the main body prosthesis, as shown in FIG.
10C.
[0033] FIG. 11 is a perspective view of a prosthesis deployment
catheter that embodies features of the invention.
[0034] FIG. 12 is a side view of one embodiment of the proximal end
of the deployment catheter of FIG. 11.
[0035] FIG. 13 is a side view of the proximal end of the deployment
catheter of FIG. 11, and showing a jacket covering components of
the deployment catheter.
[0036] FIG. 14A is a side view of the proximal end of the
deployment catheter of FIG. 11, and showing the jacket covering the
main body component of the multi-lumen prosthesis prior to
deployment.
[0037] FIG. 14B is a perspective view of an alternative embodiment
of the deployment catheter jacket of FIG. 11 showing structural
reinforcement.
[0038] FIG. 15 is a section view of the lumens in the central shaft
deployment catheter taken generally along line 15-15 of FIG.
12.
[0039] FIG. 16 is a side view of the catheter tip and central shaft
of the deployment catheter showing the catheter tip lumen and
central shaft lumen.
[0040] FIG. 17 is a perspective view of the main body component of
the multi-lumen prosthesis positioned on the proximal end of the
deployment catheter prior to deployment, and showing the first
proximal retaining means in a compressed condition.
[0041] FIG. 18A is a side view of one embodiment of a suture loop
path around the main body component of the multi-lumen
prosthesis.
[0042] FIG. 18B is a side view of an alternative embodiment of a
suture loop path around the multi-lumen prosthesis of FIG. 18A,
showing multiple suture loops.
[0043] FIG. 19 is a perspective view of the main body component of
the multi-lumen prosthesis positioned on the proximal end of the
deployment catheter showing the first proximal retaining means
released and the proximal end of the main body component
expanded.
[0044] FIG. 20 is a side view of a portion of the distal end of the
deployment catheter showing one embodiment of a first proximal
releasing means and a first proximal release wire.
[0045] FIG. 21 is a side view of a portion of the proximal end of
the deployment catheter showing detail of the first proximal
release hub and central shaft lumens.
[0046] FIG. 22 is a side view of a portion of the distal end of the
deployment catheter showing detail of one embodiment of the second
proximal releasing means.
[0047] FIG. 23 is a side view showing detail of the stabilizing
arms in a pre-deployment configuration, the proximal ends of the
stabilizing arms being arched back generally toward a first
proximal release hub.
[0048] FIG. 24 is a side view of the stabilizing arms of FIG. 23 in
a pre-deployment configuration with the deployment catheter and
multi-lumen prosthesis positioned within the descending aorta, and
showing the proximal ends of the stabilizing arms coupled to the
proximal end of the main body prosthesis.
[0049] FIG. 25 is a side view showing detail of stabilizing arms
coupled to the proximal end of the main body prosthesis, showing
the second proximal release wire stitched or otherwise extended
through a stabilizing arm aperture and through the prosthesis
material, releasably securing the stabilizing arms to the main body
prosthesis.
[0050] FIG. 26 is a side view of the stabilizing arms of FIG. 23 in
a post-deployment configuration with the deployment catheter and
multi-lumen prosthesis positioned within the descending aorta, and
showing the proximal ends of the stabilizing arms released from the
proximal end of the main body prosthesis.
[0051] FIG. 27 is a section view of the proximal end of the
deployment catheter shaft taken generally along line 27-27 of FIG.
23.
[0052] FIG. 28 is a side view of the distal end of the main body
prosthesis positioned on the deployment catheter central shaft
prior to deployment of the distal retaining means.
[0053] FIG. 29A is a side view of one embodiment of a suture loop
path around the distal end of the multi-lumen prosthesis.
[0054] FIG. 29B is a side view of an alternative embodiment of a
suture loop path around the distal end of the multi-lumen
prosthesis of FIG. 29A, showing multiple suture loops.
[0055] FIG. 30 is a side view of the distal end of the main body
component of the multi-lumen prosthesis positioned on the
deployment catheter shaft of FIG. 28, showing the distal retaining
means released and the distal end of the main body component
expanded.
[0056] FIG. 31 is a side view of a portion of the proximal end of
the deployment catheter showing detail of the distal releasing
means and central shaft lumens.
[0057] FIG. 32 is a side view of an alternative embodiment of the
distal end of the main body prosthesis positioned on the deployment
catheter central shaft prior to deployment of the distal retaining
means.
[0058] FIG. 33 is a side view of the distal end of the main body
component of the multi-lumen prosthesis positioned on the
deployment catheter shaft of FIG. 32, showing the alternative
distal retaining means released and the distal end of the main body
component expanded.
[0059] FIG. 34 is a perspective view of a first side of the
deployment catheter handle assembly that embodies features of the
invention.
[0060] FIG. 35 is a perspective view of a second side of the
deployment catheter handle assembly that embodies features of the
invention.
[0061] FIG. 36 is a top view of the deployment catheter handle
assembly of FIG. 34.
[0062] FIG. 37 is a section view of the deployment catheter handle
assembly of FIG. 34 taken generally along line 37-37 of FIG.
36.
[0063] FIG. 38 is a section view of the deployment catheter handle
assembly of FIG. 34 taken generally along line 38-38 of FIG.
36.
[0064] FIG. 39 is a top view of a portion of the deployment
catheter handle assembly of FIG. 34 showing the jacket retraction
means prior to jacket retraction.
[0065] FIG. 40 is a top view of a portion of the deployment
catheter handle assembly of FIG. 39 showing the jacket retraction
means after the jacket has been retracted.
[0066] FIG. 41 is a perspective view of a second side of one
embodiment of a rack and pinion mechanism and a release system
positioned within the deployment catheter handle assembly.
[0067] FIG. 42 is a perspective view of a second side of one
embodiment of a rack and pinion mechanism and a release system
positioned within the deployment catheter handle assembly.
[0068] FIG. 43 is a perspective view showing detail of the release
system positioned within the deployment catheter handle
assembly.
[0069] FIG. 44A is a perspective view of a lumen extension
deployment catheter that embodies features of the invention.
[0070] FIG. 44B is a perspective view of the lumen extension
deployment catheter shown in FIG. 44A, and showing a stationary
outer jacket and a hemostatic valve.
[0071] FIG. 45A is a side view of one embodiment of the proximal
end of the lumen extension deployment catheter of FIG. 44.
[0072] FIG. 45B is a side view of an alternative embodiment of the
proximal end of the lumen extension deployment catheter of FIG.
45A, and shows an optional distal retaining and releasing
means.
[0073] FIG. 46A is a side view of a proximal section of the lumen
extension deployment catheter of FIG. 45A, and showing a jacket
covering the lumen extension positioned on the catheter shaft prior
to deployment.
[0074] FIG. 46B is a side view of an alternative embodiment of a
proximal section of the lumen extension deployment catheter of FIG.
45B, and showing a jacket covering the lumen extension positioned
on the catheter shaft prior to deployment and including a distal
retaining means.
[0075] FIG. 46C is a perspective view of an alternative embodiment
of the lumen extension deployment catheter jacket of FIG. 44
showing structural reinforcement.
[0076] FIG. 47A is a section view of the lumen extension deployment
catheter shaft of FIG. 45A taken generally along line 47A-47A of
FIG. 45A.
[0077] FIG. 47B is a section view of an alternative embodiment of
the lumen extension deployment catheter shaft of FIG. 45B taken
generally along line 47B-47B of FIG. 45B.
[0078] FIG. 48A is a side view of one embodiment of a suture loop
path around the proximal end of the lumen extension.
[0079] FIG. 48B is a side view of one embodiment of a suture loop
path around the distal end of the lumen extension.
[0080] FIG. 48C is a side view of an alternative embodiment of a
suture loop path around the proximal or distal end of the lumen
extension shown in FIGS. 48A and 48B, and shows multiple suture
loops.
[0081] FIG. 49A is side view of the lumen extension deployment
catheter handle assembly of FIG. 44.
[0082] FIG. 49B is a side view of an alternative embodiment of the
lumen extension deployment catheter handle assembly of FIG. 44, and
showing and additional slide knob for an optional distal releasing
means.
[0083] FIG. 50 is top view of the lumen extension deployment
catheter handle assembly of FIG. 44.
[0084] FIG. 51 is a perspective view of one embodiment of the
release system positioned within the handle assembly of the lumen
extension deployment catheter.
[0085] FIG. 52 is an enlarged perspective view of one embodiment of
a helical fastener that can be used in association with a fastener
tool or device shown in FIG. 53.
[0086] FIG. 53 is a perspective view of a fastener tool that
embodies features of the invention.
[0087] FIG. 54 is a perspective view of the handle assembly of the
fastener tool of FIG. 53.
[0088] FIG. 55 is a perspective view of a steerable guide device
that embodies features of the invention.
[0089] FIG. 56 is a perspective view of the handle assembly of the
steerable guide device of FIG. 55.
[0090] FIG. 57 is a perspective view of an obturator or dilator
that may be used in conjunction with the steerable guide device of
FIG. 55.
[0091] FIG. 58 is a perspective view of one embodiment of a
prosthesis deployment catheter shown positioned within an abdominal
aortic aneurysm.
[0092] FIG. 59 is a perspective view of the deployment of the main
body component of the multi-lumen prosthesis within the aneurysm of
FIG. 58, with the jacket partially retracted.
[0093] FIG. 60 is a perspective view of the deployment of the main
body component of the multi-lumen prosthesis within the aneurysm of
FIG. 58, with the jacket fully retracted but prior to the release
of the proximal or distal retaining means.
[0094] FIG. 61 is a perspective view of the deployment of the main
body component of the multi-lumen prosthesis within the aneurysm of
FIG. 58, with the jacket fully retracted but prior to the release
of the proximal or distal retaining means and showing an
alternative embodiment of the distal retaining means.
[0095] FIG. 62 is a perspective view of the deployment of the main
body component of the multi-lumen prosthesis within the aneurysm of
FIG. 58, and showing the first proximal retaining means released
and the proximal end of the main body component expanded.
[0096] FIG. 63 is a perspective view of the deployment of the main
body component of the multi-lumen prosthesis within the aneurysm of
FIG. 58, and showing a second guide wire positioned through the
main body prosthesis lumen.
[0097] FIG. 64 is a perspective view of the deployment of the main
body component of the multi-lumen prosthesis within the aneurysm of
FIG. 58, and showing the steerable guide and obturator positioned
on the second guide wire and through the main body prosthesis
lumen.
[0098] FIG. 65 is an enlarged perspective view of the deployment of
the main body component of the multi-lumen prosthesis within the
descending aorta, and showing the steerable guide device and the
fastener tool just prior to fastening a helical fastener through
the prosthesis material and into tissue.
[0099] FIG. 66 is an enlarged perspective view of the deployment of
the main body component of the multi-lumen prosthesis within the
descending aorta, and showing the steerable guide device and the
fastener tool just after fastening a helical fastener through the
prosthesis material and into tissue.
[0100] FIG. 67 is a perspective view of the deployment of the main
body component of the multi-lumen prosthesis within the aneurysm of
FIG. 58, and showing the deflected end of the steerable guide
device and the fastener tool after being repositioned for
deployment of an additional helical fastener.
[0101] FIG. 68 is an enlarged perspective view of the deployment of
the main body component of the multi-lumen prosthesis within the
descending aorta, and showing one embodiment of a fastener
deployment pattern.
[0102] FIG. 69 is a perspective view of the deployment of a lumen
extension component of the multi-lumen prosthesis within the
aneurysm of FIG. 58, and showing the lumen extension catheter being
positioned partially within a prosthesis lumen.
[0103] FIG. 70 is a perspective view of the deployment of the lumen
extension component of the multi-lumen prosthesis within the
aneurysm of FIG. 58, and showing the jacket retracted from the
lumen extension deployment catheter and prior to the release of a
proximal retaining means.
[0104] FIG. 71 is a perspective view of the deployment of the lumen
extension component of the multi-lumen prosthesis within the
aneurysm of FIG. 58, and showing the lumen extension coupled to and
fully expanded within a lumen of the main body component after the
release of the proximal retaining means.
[0105] FIG. 72 is a perspective view of the deployment of the main
body component of the multi-lumen prosthesis within the aneurysm of
FIG. 58, and showing the lumen extension deployment catheter
removed and the stabilizing arms of the main body deployment
catheter released.
[0106] FIG. 73 is a perspective view of the deployment of the main
body component of the multi-lumen prosthesis within the aneurysm of
FIG. 58, and showing the distal retaining means released and the
distal end of the main body prosthesis expanded.
[0107] FIG. 74 is a perspective view of the deployment of the main
body component of the multi-lumen prosthesis within the aneurysm of
FIG. 58, and showing the withdrawal of the rejacketed main body
deployment catheter over the first guide wire.
[0108] FIG. 75 is a perspective view of the deployment of a second
lumen extension component of the multi-lumen prosthesis within the
aneurysm of FIG. 58, and showing the lumen extension catheter being
positioned partially within a prosthesis lumen.
[0109] FIG. 76 is a perspective view of the deployment of the
second lumen extension component of the multi-lumen prosthesis
within the aneurysm of FIG. 58, and showing the jacket retracted
from the lumen extension deployment catheter and prior to the
release of a proximal retaining means.
[0110] FIG. 77 is a perspective view of the deployment of the
second lumen extension component of the multi-lumen prosthesis
within the aneurysm of FIG. 58, and showing the second lumen
extension coupled to and fully expanded within a lumen of the main
body component after the release of the proximal retaining
means.
[0111] FIG. 78 is a perspective view of one embodiment of the
completed deployment of the multi-lumen prosthesis within the
aneurysm of FIG. 58.
[0112] FIG. 79A is an enlarged perspective view of an alternative
embodiment of a helical fastener that can be used in association
with a fastener tool or device shown in FIG. 53.
[0113] FIG. 79B is an enlarged top view of the alternative fastener
of FIG. 79A showing a "D" shape.
[0114] FIG. 80 is an enlarged perspective view of the deployment of
the main body component of the multi-lumen prosthesis within the
descending aorta, and showing the steerable guide device and the
fastener tool having an alternative fastener driver just prior to
fastening the helical fastener of FIG. 79A through the prosthesis
material and into tissue.
[0115] FIG. 81 is an enlarged perspective view of the fastener
driver and fastener of FIG. 80, and showing the fastener rotating
off of the fastener carrier.
[0116] FIG. 82A is an enlarged side view of the fastener driver of
FIG. 80, and showing a fastener positioned on the fastener carrier
and within a threaded fastener housing, and also showing the
fastener latch feature.
[0117] FIG. 82B is an enlarged side view of the fastener driver of
FIG. 80, and showing a fastener on the carrier and rotating off the
carrier and showing the pivoting of the fastener latch.
[0118] FIG. 82C is an enlarged side view of the fastener driver of
FIG. 80, and showing a fastener positioned on the fastener carrier
and within a threaded fastener housing, and also showing an
alternative fastener latch feature.
[0119] FIG. 83 is a perspective view of one embodiment of a
fastener cassette with fasteners releasably positioned with a
fastener receptacle.
[0120] FIG. 84 is a perspective view of an alternative embodiment
of a fastener cassette of FIG. 82.
[0121] FIG. 85 is a perspective view showing the fastener tool
positioned on a fastener cassette for removal of a fastener from
the cassette and positioning the fastener within the fastener
driver.
[0122] FIG. 86 is a perspective view showing the fastener tool with
a fastener positioned in the fastener driver and ready for
deployment.
DETAILED DESCRIPTION OF THE INVENTION
[0123] This Specification discloses various catheter-based devices,
systems, and methods for delivering and implanting radially
expandable prostheses in the body lumens. For example, the various
aspects of the invention have application in procedures requiring
the repair of diseased and/or damaged sections of a hollow body
organ and/or blood vessel. The devices, systems, and methods that
embody features of the invention are also adaptable for use with
systems and surgical techniques that are not necessarily
catheter-based.
[0124] The devices, systems, and methods are particularly well
suited for treating aneurysms of the aorta that primarily occur in
the abdominal region, usually in the infrarenal area between the
renal arteries and the aortic bifurcation, as well as aneurysms
that also occur in the thoracic region between the aortic arch and
renal arteries. For this reason, the devices, systems, and methods
will be described in this context. Still, it should be appreciated
that the disclosed devices, systems, and methods are applicable for
use in treating other dysfunctions elsewhere in the body, which are
not necessarily aorta-related.
I. OVERVIEW
[0125] FIG. 1 depicts a portion of the descending aorta and shows
an abdominal aortic aneurysm 20. For the purposes of illustration,
FIG. 1 shows the targeted site for delivery and implantation of a
prosthesis as being within the abdominal aortic aneurysm 20. It is
to be appreciated that the targeted site can also be elsewhere in
the body. In the illustrated arrangement, the prosthesis takes the
form of an endovascular graft.
[0126] In order to provide a consistent orientation for the
devices, systems, and methods described herein, the terms proximal
or cephalad will be used to describe a relation or orientation
toward the head or heart, and the terms distal or caudal will be
used to describe a position or orientation toward the feet or away
from the heart. Therefore, the devices, systems, and methods can be
described as having a proximal or cephalad component and a distal
or caudal component. The use of these terms also applies to the
implantation apparatus as used in the implantation process
described, i.e., the deployment catheter handle is distal or caudal
as the handle of the deployment catheter is oriented toward the
feet and away from the heart.
[0127] The proximal or cephalad end 202 of a prosthesis deployment
catheter 200 can be seen in FIG. 1 positioned over a first guide
wire 30 (the guide wire being previously positioned) and extending
through at least a portion of the abdominal aortic aneurysm 20. The
deployment catheter 200 carries the main body of the prosthesis 120
(see FIG. 2), which is placed at the targeted site, e.g., by radial
expansion of the main body prosthesis 120 (see FIG. 3). After
expansion of the main body prosthesis 120, one or more fasteners
402 (see FIG. 4) may be introduced by a fastener device 400 to
anchor the proximal end 108 of the main body prosthesis, in
place.
[0128] FIG. 2 depicts the initial stage of the main body prosthesis
120 deployment at the targeted site. While the deployment method
can vary, in the illustrated embodiment, the delivery catheter 200
has a movable jacket or outer sheath 210, which overlays the main
body prosthesis 120. When the outer jacket 210 is pulled distally,
or in a caudal direction, the main body prosthesis 120 is exposed
but may remain in an undeployed configuration until releasing means
has been activated. Once the releasing means has been activated,
the main body prosthesis or a portion(s) of the main body
prosthesis 120 is free to radially expand, thereby enlarging to
contact at least a portion of the internal walls of the blood
vessel. The prosthesis deployment process is continued, including
the deployment of one or more lumen extensions, until a multi-lumen
or bifurcated prosthesis 100 is fully deployed within the vessel,
as can be seen in FIG. 4 and will be described in greater detail
later.
[0129] It is to be understood that the terms prosthesis and
prostheses both can mean an independent component, or multiple
components coupled together, or multiple components not necessarily
coupled together. The prosthesis may be either coupled together at
or near the targeted site, or exterior the body, or a combination
of both.
[0130] In a desirable embodiment, the prosthesis, is a multi-lumen
prosthesis. In an alternative embodiment, the prosthesis is a
straight prosthesis. The prosthesis 100 may be self-expanding, or,
the prosthesis 100 can utilize an expanding member, such as a
balloon or mechanical expander. FIG. 4 depicts a completely
deployed multi-lumen or bifurcated prosthesis 100 that is sized and
configured to be positioned within the aorta and extend across the
aneurysm and into the contralateral iliac artery and the
ipsilateral iliac artery. FIG. 5 depicts a completely deployed
straight prosthesis 50.
[0131] It is to be appreciated that one or more fasteners 402 can
be introduced into the multi-lumen prosthesis 100 to anchor the
main body 120 and/or lumen extensions 140 in place at different
times or at the same time during the procedure.
II. GENERAL METHODS OF ENDOVASCULAR IMPLANTATION
[0132] The prosthesis or prostheses 100 as just described lend
themselves to implantation in a hollow organ in various ways. The
prosthesis may be implanted using catheter-based technology via a
peripheral intravascular access site, such as in the femoral
artery, optionally with the assistance of image guidance. Image
guidance includes but is not limited to fluoroscopy, ultrasound,
magnetic resonance, computed tomography, or combinations thereof.
Alternatively, the prosthesis can be implanted, e.g., in an open
chest surgical procedure.
[0133] FIGS. 58 to 78 show a representative embodiment of the
deployment of a prosthesis of the type shown in FIG. 4 by a
percutaneous, catheter-based procedure. Percutaneous vascular
access is achieved by conventional methods into the femoral artery,
for example.
[0134] The implantation of the multi-lumen prosthesis 100 is first
described here in a number of general steps. The multi-lumen
prosthesis and each of the various tools used to implant the
prosthesis are then described with additional detail below. The
multi-lumen prosthesis 100 is described in section III and the
various implantation apparatus are described in section IV.
Additionally, the general implantation steps are then described
again with additional detail below in section V.
[0135] A first implantation step can be generally described as
deploying the main body 120 of the prosthesis. The deployment
catheter 200 is positioned within the aortic aneurysm 20 and the
main body of the prosthesis is allowed to deploy. Proximal and
distal retaining means hold the main body prosthesis in a
predetermined relationship to the proximal end 202 of the
deployment catheter. By activating a proximal releasing means, the
proximal end 108 of the main body prosthesis 120 may be partially
or fully released from the deployment catheter shaft so as to allow
the proximal stent 130 to expand to contact the aorta or a portion
of the aorta. At this step the prosthesis may not be fully released
from the deployment catheter. The main body prosthesis 120 may be
attached to the deployment catheter 200 through a second proximal
retaining means. The proximal end 108 or other areas of the main
body prosthesis 120 is fastened to the vessel wall to resist axial
migration of the prosthesis.
[0136] Next, an extension catheter 350 carrying a first prosthesis
lumen extension 140 is guided through the vasculature and to the
main body prosthesis 120. The first lumen extension is
telescopically fitted within the second lumen 128 of the main body
prosthesis 120 and allowed to radially expand. The extension
catheter is then removed, leaving the lumen extension 140 coupled
to the main body prosthesis 120 and extending into the
contralateral iliac artery.
[0137] If the main body prosthesis 120 is attached to the
deployment catheter 200 through a second proximal retaining means,
a second releasing means is activated to allow the proximal end 108
of the main body prosthesis 120 to release from the deployment
catheter shaft 216. The distal releasing means is then activated,
allowing the distal end 110 of the main body prosthesis 120 to
release from the deployment catheter shaft 216 and radially expand.
The deployment catheter 200 is then removed from the body.
[0138] Lastly, the extension catheter 350 carrying a second
prosthesis lumen extension 140 is guided through the vasculature
and to the main body prosthesis 120. The second lumen extension 140
is telescopically fitted within the first lumen 126 of the main
body prosthesis and allowed to radially expand. The extension
catheter 350 is then removed, leaving the lumen extension 140
coupled to the main body prosthesis 120 and extending into the
ipsilateral iliac artery. The multi-lumen prosthesis 100 is now
fully deployed across the aortic aneurysm.
III. MULTI-LUMEN PROSTHESIS ASSEMBLY
[0139] FIG. 6 shows a multi-lumen prosthesis assembly 100 that
embodies features of the invention. In the illustrated embodiment,
the multi-lumen prosthesis assembly 100 comprises a main body
component 120 and at least one lumen extension 140, desirably two
lumen extensions.
[0140] The main body component 120 is sized and configured to fit
within a hollow body organ and/or a blood vessel. As described in
this Specification, the targeted site of deployment is within the
aorta adjacent the renal arteries, as will be described in greater
detail later. However, this targeted site of deployment is selected
for purposes of illustrating the features of the prosthesis 100,
and is not intended to be limiting.
[0141] Referring to FIG. 7A, the main body component 120 has a
proximal and distal end 108, 110, and includes an interior
communicating with a proximal opening 122 for fluid flow into or
from the prosthesis. The main body component 120 includes a septum
124 within its interior. The length of the septum 124 within the
prosthesis 120 can vary. In the illustrated embodiment, the septum
124 does hot extend along the entire length of the main body
component 120, but is spaced a distance from the proximal opening
122. In the illustrated arrangement, the septum 124 comprises a
longitudinal seam. The seam can be formed by coupling the opposing
surfaces together (i.e., the front and back) of the prosthesis
material 112 (which is typically a fabric) by sewing, heat bonding,
stitching or weaving, for example, or any combination. The coupling
of the opposing surfaces together thereby creates a septum or
shared, common wall between two lumens, the first lumen 126 and the
second lumen 128 (see FIGS. 8A and 8B). Typically the seam 124
would be located along the midline of the main body to create two
equally sized lumens 126 and 128. However, the location of the seam
124 could be moved, if different sized lumens were desired. In one
embodiment shown in FIG. 7C, the septum 124 is formed by a
stitch(s) 131 at the septum's proximal end 121, a stitch(s) 133 at
the septums distal end 123, and a weave(s) 135 in-between the
stitches 131, 133 at the septum's proximal end 121 and distal end
123. The combination of stitches and weaving, for example, provides
added stability to the septum 124.
[0142] The septum 124 transforms at least a portion of the interior
of the main body component 120 into the multi-lumen flow channel
configuration. In the illustrated embodiment, the multi-lumen flow
channel configuration comprises dual first and second interior
lumens 126 and 128. Due to the septum 124, the dual first and
second interior lumens 126 and 128 of the multi-lumen flow channel
configuration do not form branched or divergent lumens. The shared
common wall or seam (the septum 124) prevents divergence and
maintains the lumens 126 and 128 in a non-divergent, generally
parallel flow relationship (as FIGS. 8A and 8B show).
[0143] In the illustrated arrangement, the septum 124 runs
generally along the mid-line of the main body component 120, making
the multi-lumen flow channel configuration within the main body
component 120 essentially symmetric. However, it should be
appreciated that the septum 124 could form a non-symmetric
multi-lumen flow channel configuration. It should also be
appreciated that multiple septums can be present within the
interior, transforming the interior of the main body component 120
into several flow lumens. The length of the septum can vary. In a
representative embodiment, the septum 124 is typically greater than
10 mm in length and not less than 5 mm in length.
[0144] In the illustrated embodiment, the first lumen 126 defines a
flow channel sized and configured to reach a targeted destination
or source spaced a defined distance from the proximal opening 122,
while the truncated second lumen 128 communicates with generally
the same targeted destination as the proximal opening 122 of the
main body component 120 itself. Furthermore, the septum 124 is
sized and configured to accommodate the coupling of a flow channel
extension 140 to the first lumen 126 and to the truncated second
lumen 128, to likewise extend their reach to another targeted
source or destination spaced from the proximal opening 122, if
desired.
[0145] The second lumen 128 is truncated along at least a portion
of the septum 124. As a result, the distal opening 127 of the first
lumen 126 can be said to extend beyond the distal opening 129 of
the second lumen 128. Still, the shared common wall (the septum
124) prevents divergence and maintains the lumens 126 and 128 in a
non-divergent, generally parallel flow relationship. It is to be
appreciated that the first and second lumens 126, 128 may be
reversed, i.e., the second lumen 128 may extend beyond the first
lumen 126 (see FIG. 7D).
[0146] In this arrangement, the multi-lumen prosthesis assembly 100
desirably includes a first and second flow channel lumen extension
140 (see FIG. 6). The first and second lumen extensions 140
desirably comprise the same construction, i.e., they are duplicates
of each other. Referring to FIG. 9A, the lumen extension 140
includes a proximal end 142 that is sized and configured to be
telescopically fitted within the first lumen 126 and/or the
truncated second lumen 128 of the main body component 120. The
distal end 144 of the lumen extension 140 is sized and configured
to extend the reach of the first lumen 126 and the truncated second
lumen 128 to another targeted destination or source spaced a
defined distance from the main body component proximal opening 122.
As a result, a portion of the extended second lumen 128 is joined
to the first lumen 126 by the septum 124, and a portion of the
extended second lumen 128 is not joined by the septum 124 to the
lumen extension 140 of the first lumen 126.
[0147] Both the first lumen 126 and the truncated second lumen 128
of the main body component 120, which is joined by the septum 124
to the first lumen 126, provide an interface region or socket that
is fully enclosed within the body of the main body component 120
itself. The first lumen 126 and the truncated second lumen 128 are
therefore not prone to kinking or twisting or other kinds of
movement independent of the main body component 120. Passage of a
guide wire through the first lumen 126 or the second lumen 128 can
occur unimpeded.
[0148] Being telescopically fitted within the interface region or
socket and enclosed within the main body component 120, the
mechanical properties of the lumen extension 140 are supplemented
by the structural support and integrity of the main body component
120 itself, and vice versa. Coupled together, the main body
component 120 and the lumen extension 140 provide enhanced
resistance to migration and/or separation of the lumen extension
140 from the main body component 120. Seated within the enclosed
interface region, the lumen extension 140 is peripherally sealed
within the main body component 120 to resist leaks or seepage of
fluids around the lumen extension 140. The septum 124 can be
tapered, curved, wavy, or otherwise non-linear to enhance the
connection between the lumen extension 140 and the main body
component 120.
[0149] In one illustrated use (see FIG. 3), the main body component
120 can be deployed in the aorta in the region of the bifurcation
of the first and second iliac, or ipsilateral and contralateral
iliac arteries. When the main body prosthesis 120 is deployed, both
the first lumen 126 and the second lumen 128 remains in
communication with the aorta. After the main body component 120 is
deployed, the first lumen extension 140 can be fitted within the
distal opening 127 of the first lumen 126, and the second lumen
extension 140 can be fitted within the distal opening 129 of the
second lumen 128, so that the distal end 144 of the first extension
140 can be sized to reach into the first iliac of the bifurcation,
while the distal end 144 of the second extension 140 can reach into
the second iliac of the bifurcation (see FIG. 4). In this
arrangement, the first lumen extension 140 of lumen 126 serves as a
first lumen or ipsilateral lumen of the prosthesis 100, and the
lumen extension 140 of the second lumen 128 serves as a second
lumen or contralateral lumen.
[0150] The main body component 120 may include a proximal sealing
stent 130 at its proximal end 108, which may extend beyond the
prosthetic material 112 (see FIG. 7A). The proximal stent 130
orients the main body prosthesis 120 within the lumen and aids in
maintaining the position of the main body prosthesis 120 in the
aorta without obstructing the normal blood flow into the renal
arteries. The proximal sealing stent 130 may also serve to limit
the length of the prosthesis edge which is exposed to the flow of
fluids and may cause scalloping. The proximal sealing stent 130 may
be a self-expanding zigzag or diamond shaped stent, for example,
and is desirably sewn inside the prosthesis material 112, although
the stent may be outside, or may be wrapped between two layers of
prosthesis material 112, for example.
[0151] Typically, this region of the aorta (proximal neck of the
aneurysm just below the renal arteries) is also one area where one
or more fasteners 402 may be introduced by a fastener device 400 to
anchor the prosthesis 100 in place (see FIG. 4). However, it should
be noted that other areas throughout the main body 120 and lumen
extensions 140 can also be fastened in place. It is desirable that
this region of the main body component 120 be sized and configured
for the receipt and retention of fasteners, e.g., the size and
spacing of diamond or zigzag stent patterns to specially
accommodate the placement of fasteners; and/or the use of woven
fibers with an "X-pattern" or a "sinusoidal pattern" to specially
accommodate placement of fasteners; and/or to fold over the
prosthetic material 112 to form multiple layers, to reinforce the
prosthesis in the region where fasteners 402 are placed; and/or the
use of denser weave patters or stronger fibers from, e.g.,
Kevlar.TM. material or Vectran.TM. material or metallic wire woven
alone or interwoven with typical polyester fibers in the region
were fasteners are placed. It may also be desirable to
fluoroscopically indicate this region, of the prosthesis with
radiopaque markers 132 on the prosthetic material 112 or proximal
sealing stents 130 to aid in positioning the fastening devices.
[0152] Additional stents may be utilized throughout the main body
component 120. Desirably, a minimal number of stents would be
utilized within the main body component 120.
[0153] The multiple lumens 126 and 128 in the main body component
120 may typically be supported with distal stent rings 134 sewn or
otherwise attached to the inside or outside of the prosthetic
material 112. The proximal apices 136 of the stent rings 134
desirably are angled or curved inwardly (see FIG. 7B). The inward
angle provides a retentive feature when the lumen extension 140 is
positioned within a first or second lumen (see FIG. 10B).
Alternative retentive features may also be used, such as hooks,
barbs, loops of fabric or loops/folds of graft material or pockets
in graft material, for example. Ideally, the distal stent rings 134
in one lumen 126 are staggered axially in position with the stent
rings 134 in the other lumen 128, so that they do not overlap each
other when the main body component 120 is radially compressed prior
to deployment.
[0154] Rotational orientation of the main body component 120 within
the vessel lumen or hollow body organ is accomplished with
additional radiopaque markers 137 and 138 attached to the main body
prosthesis 120 for visualization under fluoroscopy. Typically,
these markers may be attached to the prosthetic material 112.
Still, the markers 137 and 138 may be attached to the proximal
sealing stent 130 or distal stent rings 134 instead of or in
addition to the prosthetic material 112 to help fluoroscopically
determine the location of all prosthesis openings. The radiopaque
markers typically are in the form of marker bands, tight wound
coils, or wire made from radiopaque materials such as platinum,
platinum/iridium, tantalum, or gold for example.
[0155] Desirably, one or more markers 137, 138, are longer than the
other, and are attached on opposite sides of the main body
component 120 with the longer markers 137 aligned on the side with
the first lumen 126 and the shorter markers 138 aligned on the side
with the second lumen 128, for example. In an alternative
embodiment the markers could be aligned with the septum. The
markers 137 and 138 enable the clinician to determine the desired
rotational orientation of the main body prosthesis 120 in the
delivery system so that, upon deployment, the first distal opening
127 and the second distal opening 128 are aligned with the desired
iliac arteries. The proximal markers 132 may also be included to
enable the clinician to determine the position of the proximal end
108 of the main body component 120 in relation to the fixation
point of the aorta. Additionally, distal markers 139 may be
included to aid in the location of the distal openings 127, 129,
and the insertion of the lumen extension 140. Insertion depth
marker(s) 125 may be attached near the septum 124, or may be
attached to the septum, or may be attached to the prosthesis
material 112, for example, to indicate the location of and
insertion depth for the lumen extension 140.
[0156] As previously described, the main body 120 (and the lumen
extension 140) desirably utilizes a prosthetic material 112. The
material 112 of the main body 120 may carry individual
self-expanding, zigzag or diamond type stent rings, for example.
The stent rings need not be attached to one another throughout the
main body prosthesis 120. However, it may be desirable in certain
locations within the prosthesis structure 120 to have attachments
between the individual stent rings to provide stability and/or
additional radial support.
[0157] As previously stated, the septum 124 is formed by sewing,
heat bonding, stitching, or weaving opposing surfaces (i.e., the
front and back) of the prosthetic material 112 of the main body
component 120 together. In the region of the septum 124, the stent
rings 134 extend from the septum 124 about the formed lumen, but do
not enter or otherwise interrupt the septum 124 itself. The septum
124 is continuous and is formed separate from the supporting
structure of stent rings 134.
[0158] The individual distal stent rings 134 allow for longitudinal
main body prosthesis 120 compliance while maintaining radial
support of the prosthesis lumens. This technical feature allows the
prosthesis to more readily accommodate changes in vessel/aneurysm
morphology.
[0159] The stents can be made, e.g., from Nitinol.RTM.. Still,
other materials, manufacturing methods and designs can be used.
Each of the stents may be sewn onto prosthetic material 112. In
certain locations it is desired to have the stents attached to the
outer diameter of the prosthetic material 112. Still, it is also
contemplated that the stents could be attached to the inner
diameter of the prosthetic material 112.
[0160] In the illustrated embodiment, the prosthetic material 112
is woven polyester, and the attachment of the stents is made with
polyester suture. However, it is also contemplated that other
attachment means could be utilized to secure the stents to the
prosthetic material 112. These means include bonding; capturing the
stents between two layers of prosthetic material 112; and
incorporating the stents directly into the woven prosthetic
material 112.
[0161] As seen in FIG. 9A, the lumen extension 140 has at least one
spiral stent 146 positioned along at least a portion of the length
of the extension and attached to the outside of prosthetic material
112 to provide stability and/or additional radial support. However,
as in the main body component 120, it is contemplated that the
stent 146 could also be placed on the inside of the prosthetic
material 112, or the spiral stent 146 could be captured between two
layers of prosthetic material (not shown). The prosthetic layer 112
could be a continuous tube or non-tubular. The prosthetic material
112 could cover the entire lumen extension 140 or the prosthetic
material 112 could cover only a portion of the lumen extension.
Furthermore, as previously discussed, the spiral stent 146 need not
be one continuous stent along the length of the extension. The
addition of the spiral stent 146 to the lumen extension 140 aids in
the deployment of the lumen extension and allows for longitudinal
compliance while maintaining radial support of the lumen within the
lumen extension 140. Typically, radiopaque extension markers 148
are used on each end of the extension 140 to aid in the
visualization of the placement of the lumen extension 140 within
the lumen of the first distal opening 127 and the second distal
opening 129 of the main body component 120.
[0162] As shown in FIGS. 9A through 9D, the engaging stent or
stents 150 in the lumen extension 140 can be sized, configured, and
arranged to engage the stent rings 134 in the first lumen 126 and
the second lumen 128 of the main body 120. The distal apices 147 of
at least one engaging stent 150 are angled outwardly to engage the
mating distal stent 134 on the main body component 120 (seen
particularly in FIGS. 9B and 9D). This engagement prevents the
lumen extension 140 from moving or migrating axially in relation to
the first lumen 126 and the second lumen 128 after the lumen
extension 140 has been deployed. In an alternative embodiment shown
in FIGS. 10A through 10D, the spiral stents 146, which are attached
to the outside of the lumen extension 140, may engage with the
distal stents 134 of the main body 120 without being angled
outwardly. In either of these embodiments, additional features may
be included with the main body 120 or the lumen extensions 140 to
help prevent the lumen extension 140 from moving or migrating
axially in relation to the main body 120, such as hooks, barbs,
loops of fabric or loops/folds of graft material, or pockets in
graft material, for example.
[0163] During use (see FIG. 58), the deployment catheter 200 is
navigated over the guide wire 30 through an iliac to the desired
location within the aorta near the renal arteries. The catheter 200
carries the main body component 120 of the multi-lumen prosthesis
system 100 in a radially reduced configuration. At the targeted
site, the retaining jacket 210 is retracted which allows the distal
stent 134 of the second lumen 128 to radially expand into the
position shown in FIG. 60. The distal stent 134 of the first lumen
126 and the proximal stent 130 are not allowed to expand until
releasing means have been activated.
[0164] As FIGS. 69 and 70 show, the first lumen extension 140 is
carried in a radially compressed condition by an over-the-wire
extension catheter 350 coming from the contralateral iliac, for
example. The catheter 350 deploys the first lumen extension 140,
such that the proximal end 142 of the lumen extension 140 is
telescopically received within the second lumen 128 of the main
body component 120 and the distal end 144 extends into the
contralateral iliac, as FIG. 71 shows. The second lumen extension
140 is then carried in a radially compressed condition by the
extension catheter 350 coming from the ipsilateral iliac, for
example. The extension catheter 350 deploys the second lumen
extension 140, such that the proximal end 142 of the lumen
extension 140 is telescopically received within the first lumen 126
of the main body component 120 and the distal end 144 extends into
the ipsilateral iliac, as FIG. 77 shows. Only when each lumen
extension 140 is telescopically received within the first lumen 126
and second lumen 128 of the main body component 120, a bifurcated
prosthesis 100 is formed with divergent lumens; as seen in FIG.
78.
IV. IMPLANTATION APPARATUS
[0165] A. Prosthesis Deployment Catheter
[0166] FIG. 11 shows a prosthesis deployment catheter 200 having
features of the invention. The purpose of the catheter 200 is to
(i) contain and/or restrain the main body prosthesis 120 prior to
its deployment (see FIG. 14A), (ii) deliver the main body
prosthesis 120 through the vasculature to a desired location within
the body, e.g., a hollow body organ or a blood vessel (see FIG. 1),
and (iii) controllably deploy the main body prosthesis 120 in the
desired location (see FIGS. 2 and 3), including maintaining a
stable position of the main body prosthesis 120 in a partially
deployed condition while the main body prosthesis is fastened to
the vessel wall. In the illustrated embodiment, the proximal end
202 of the catheter 200 is shown positioned over a guide wire 30 in
a body lumen (see FIG. 1). The catheter 200 carries the main body
prosthesis 120 in a radially reduced configuration to the targeted
site. At the targeted site, the catheter 200 releases the radially
reduced prosthesis 120, which expands radially (see FIGS. 2 and 3).
After partial or complete expansion or deployment of the main body
prosthesis 120, one or more fasteners 402 are desirably introduced
by a fastener device 400 to anchor the main body prosthesis 120 in
place. The fasteners 402 may also serve to provide apposition of
the prosthesis material 112 to the hollow body organ or vessel wall
and to seal and/or repair a fluid leak. Further details of the
fastener device and fastener can be found in section three (3)
below.
[0167] As previously described, the prosthesis 100 can be sized and
configured to be either straight or bifurcated form. FIG. 4 depicts
a completely deployed bifurcated prosthesis 100. FIG. 5 depicts a
completely deployed straight prosthesis 50.
[0168] For the purposes of illustration, FIG. 1 shows the targeted
site as being within an abdominal aortic aneurysm. Of course, the
targeted site can be elsewhere in the body.
[0169] As shown in FIGS. 11 through 14B, the catheter 200 comprises
an inner assembly 208, an outer jacket 210, and a handle assembly
212. These components will now be individually described in greater
detail.
[0170] 1. The Inner Assembly
[0171] In the illustrated embodiment (see FIGS. 12 through 14B),
the inner assembly 208 comprises a central shaft 216, which
functions as a carrier for the main body prosthesis 120, proximal
and distal retaining means 218, 220, and a catheter tip component
222. The proximal retaining means 218 desirably comprises a first
proximal retaining means 224 and a second proximal retaining means
226. The first proximal retaining means 224 desirably retains at
least a portion of the main body prosthesis 120 in a radially
compressed, and/or partially radially expanded condition prior to
deployment and prior to fastening the main body prosthesis 120 to
the vessel wall. The second proximal retaining means 226 desirably
functions to stabilize the deployed proximal sealing stent 130 by
preventing longitudinal and to a limited extent rotational
movement. Each of the first and second proximal retaining means
also desirably include a co-acting releasing means or mechanism
228, 230 for maintaining the first or second proximal retaining
means 224, 226 in a desired relationship with the main body
prosthesis 120 prior to activation. The distal retaining means or
mechanism 220 also desirably includes a releasing means or
mechanism 232 for activating/releasing the distal retaining means
or mechanism 220. The releasing means may comprise a wide variety
of devices, such as wire or wires, sutures, magnetics, or fluids,
and may include sliding, pulling or pushing, for example.
[0172] a. The Central Shaft
[0173] In the embodiment shown in FIGS. 13 and 14A, the central
shaft 216 and the proximal and distal retaining means 218, 220 are
located within the confines of the outer jacket 210. In this
respect, the outer jacket 210 functions as an enclosure for the
main body prosthesis 120 on the carrier (see FIG. 14A). In this
arrangement, the catheter tip component 222 is attached to the
proximal end of the central shaft 216, and the proximal end of the
outer jacket 210 terminates adjacent the catheter tip component
222. Thus, the catheter tip component 222 extends outward beyond
the outer jacket 210. The central shaft 216, the proximal and
distal releasing means 228, 230, 232, and the outer jacket 210 may
be coupled to the handle assembly 212 at the proximal end of the
catheter handle assembly 212 (see FIG. 11). As can be seen in FIG.
14A, the main body prosthesis 120 is contained in a cavity 234
defined between the central shaft 216 and the outer jacket 210 in
the proximal section of the deployment catheter 200.
[0174] The central shaft 216 extends from the handle assembly 212
to the catheter tip component 222. The central shaft 216 may be
made, e.g., from stainless steel or other suitable medical
materials including other metals or polymers. The central shaft 216
comprises at least one lumen, desirably more than one lumen, and
more desirably four lumens.
[0175] One lumen may be described as the central lumen 236 (see
FIG. 15), with an inner diameter between 0.010 and 0.120 inches,
desirably between 0.020 and 0.060 inches and most desirably between
0.030 and 0.050 inches. As described, the central lumen 236 allows
for the insertion of the guide wire 30 up to 0.038'' diameter. The
catheter tip component 222 also desirably has at least one lumen
238 (see FIG. 16) configured to align with at least one lumen
within the central shaft 216. This lumen 238 allows for the
insertion of the guide wire 30 through the central shaft 216 and
through the catheter tip component 222. Typically this lumen 238
will have an inner diameter between 0.010 and 0.120 inches,
desirably between 0.020 and 0.060 inches and most desirably between
0.030 and 0.050 inches.
[0176] b. Catheter Tip
[0177] Desirably, the catheter tip component 222 is flexible and
has a long, tapered proximal end 240 and a shorter, tapered distal
end 242. The maximum diameter of the catheter tip component 222 is
approximately the same as the outside diameter of the proximal end
of the outer jacket 210. The proximal end 240 of the catheter tip
component 222 provides a smooth tapered transition from the lumen
238 containing the guide wire 30 to the proximal edge of the outer
jacket 210. This feature aids in catheter insertion and navigation
through tortuous anatomy over the guide wire 30. The tapered
section on the distal end 242 of the catheter tip component 222
prevents the catheter tip component 222 from inadvertently engaging
the main body prosthesis 120, portions of the surrounding anatomy,
or an introducer sheath or the like during removal of the
deployment catheter 200 from the body.
[0178] 2. Proximal Retaining Means
[0179] a. First Proximal Retaining Means
[0180] As can be seen in FIGS. 17 through 19, in the illustrated
embodiment, the first proximal retaining means 224 comprises at
least one suture, or sutures, 252 and/or equivalent structures,
which are coupled to the prosthetic material 112, or one or more
stents 130 on the main body prosthesis 120. The suture 252 is, in
turn, looped around the releasing means 228, e.g., a release wire
250, when the release, wire 250 is in its proximal-most position,
as FIGS. 17 and 18A shows. Distal retraction of the wire 250
withdraws the wire 250 from the suture loop 252, and allows the
proximal end 108 of the main body prosthesis 120 to radially
expand, as FIG. 19 shows. In an alternative embodiment, the suture
252 may comprise more than one suture, i.e., two or more suture
loops. FIG. 18B shows the path of two suture loops 252 looped
around the release wire 250.
[0181] Belt loops or the like may be provided on the main body
prosthesis 120 and/or lumen extensions 140 to guide and support the
suture loop(s) along the path of the suture loop (see FIGS. 17 and
46B for example). The belt loops can be spaced at desired
circumferential intervals, such as every ninety degrees, for
example.
[0182] In the illustrated embodiment, one end of the suture loop
252 is coupled to the prosthetic material 112 or one or more stents
130 at or near the proximal end 108 of the main body prosthesis
120. The suture loop 252 is then looped around the main body
prosthesis 120 and the releasing means 228 in a predetermined
pattern, as shown in FIG. 18A, in order to compress and retain the
proximal end 108 of the prosthesis 120. The free end of the suture
loop 252 is then coupled to the prosthetic material 112 or one or
more stents 130 at or near the proximal end 108 of the main body
prosthesis 120. FIG. 18B shows two separate loops 252 looped around
the main body prosthesis 120 and the release wire 250. It should be
appreciated, however, that suture loop 252 could be coupled to
stents elsewhere in the main body prosthesis 120, and/or the other
components of the main body prosthesis 120 as well.
[0183] The suture loop 252 and releasing means 228, e.g., release
wire 250, of the embodiment just described retains the prosthesis
120 in a desired relationship to the central shaft (see FIG. 17).
The suture loop 252 and the releasing means 228 help to keep the
main body prosthesis 120 from moving distally as the outer jacket
210 is retracted. The suture loop 252 also keeps the stent or
stents 130 that are retained by the suture loop 252 in a radially
compressed condition as the outer jacket 210 is retracted. The
suture loop 252 and releasing means 228 prevent the proximal end
108 of the main body prosthesis 120 from self-expanding until the
releasing means 228 has been withdrawn. In the illustrated
embodiment, the withdrawal of the releasing means 228 is
accomplished by operating a control knob to move the releasing
means 228 distally, withdrawing the releasing means 228 away from
the suture loop 252. Once the releasing means 228 is withdrawn, the
restrained components of the main body prosthesis 120 are free to
self expand, as FIG. 19 shows.
[0184] As can be seen in FIGS. 20 and 21, the first
proximal-releasing means 228 comprises a first proximal release hub
244 positioned over the central shaft 216, and a release wire 250.
The first proximal release hub 244 may include a small hole or
lumen 246 in the proximal end of the hub 244 that is in fluid
communication with a first proximal release lumen 248 within the
central shaft 216. Each lumen 246, 248 desirably includes a
diameter sufficiently large to accommodate the first proximal
release wire 250 extending from the handle assembly 212 to beyond
the first proximal release hub 244. It is to be appreciated that
the release wire 250 may extend external the shaft 216 as well.
[0185] The first proximal retaining means 224 holds the main body
prosthesis 120 in a desired configuration prior to deployment (see
FIGS. 17 and 18A) and the first proximal releasing means 228
selectively releases the main body prosthesis 120 for the first
stage of deployment (see FIG. 19). In the illustrated embodiment,
the distal end of the first proximal release wire 250 is connected
to an actuator or control button or knob in the handle assembly
212, as will be described further below.
[0186] The main body prosthesis 120 is retained by at least the
first proximal retaining means 224 along the central shaft 216 in
the cavity 234, which extends between the distal end 242 of the
catheter tip component 222 and the proximal end of a spacer 206 (as
best seen in FIG. 14A). In the illustrated embodiment, the
releasing means 228 includes the release wire 250 that may extend
through at least a portion of the central shaft 216. The proximal
end of the wire 250 passes through the lumen 246 of the first
proximal release hub 244. The first proximal release wire 250 is
thereby kept in a desired relationship within or along the central
shaft 216. The distal end of the first proximal release wire 250 is
coupled to the control knob, such that fore and aft movement of the
knob moves the release wire 250, respectively, proximally and
distally.
[0187] As illustrated and described, the first proximal releasing
means 228 is coupled to one restrained component of the main body
prosthesis 120, i.e., suture loop 252. It should be appreciated,
however, that the releasing means 228 can be coupled to the main
body prosthesis 120 at two or more restrained regions, so that
withdrawal of the releasing means 228 frees the prosthesis at two
or more restrained regions. It should also be appreciated that the
releasing means 228 can comprise more than a single releasing
element. For example, multiple, individual releasing wires 250
could be coupled to the main body prosthesis 120 at different
regions, so that release of separate regions of the main body
prosthesis 120 can be individually controlled.
[0188] b Second Proximal Retaining Means
[0189] Referring back to FIG. 12, the proximal retaining means 218
may also incorporate a second retaining means 226 which may
function in cooperation with, or separate from the first proximal
retaining means 224. The second proximal retaining means 226 may be
held in place by the second proximal releasing means 230 in a
predetermined, spaced relationship with the central shaft 216.
[0190] Referring now to FIGS. 22 through 27, the second proximal
retaining means 226 may comprise at least one stabilizing arm 256,
and/or equivalent structures, and desirably more than one
stabilizing arm, such as three stabilizing arms, as shown. The
second proximal releasing means 226 may comprise a second proximal
release hub 266 and a second proximal release wire or wires
268.
[0191] The distal ends 258 of the stabilizing arms 256 are coupled
to the second proximal release hub 266. In a pre-deployment
configuration, the proximal ends 262 of the stabilizing arms 256
are arched back generally toward the first proximal release hub 244
(see FIGS. 23 and 24) and are releasably attached to the prosthesis
material 112 at or near the proximal end 108 of the main body
prosthesis 120 (see FIGS. 24 and 25). In a post-deployment
configuration, as seen in FIG. 26, the stabilizing arms 256 extend
proximally toward the catheter tip 222.
[0192] The proximal ends 262 of the stabilizing arms 256 include a
stabilizing arm aperture 264. In the pre-deployment configuration,
the stabilizing arms 256 are positioned within the proximal opening
122 of the main body prosthesis 120 and the second proximal release
wire 268 is stitched or otherwise extended through the stabilizing
arm aperture 264 and through the prosthesis material 112,
releasably securing the stabilizing arms 256 to the main body
prosthesis 120 (as best seen in FIG. 25). Distal retraction of the
second proximal release wire 268 (using a second control knob, to
be described later) withdraws the second proximal release wire 268
from the prosthesis material 112 and releases the stabilizing arms
264. The main body prosthesis 120 is now free from the retentive
feature of the stabilizing arms 256, and the stabilizing arms
return to the post-deployment configuration, as shown in FIG. 26.
It is to be appreciated that the second proximal release wire 268
may comprise multiple release wires, including one release wire for
each stabilizing arm 256. The second proximal release wire 268 may
comprise a single wire extending through the central shaft, and
then divide into multiple wires to individually engage the
stabilizing arms, or the release wire 268 may comprise multiple
wires extending through the central shaft 216 to individually
engage each stabilizing arm 256. In an alternative embodiment, the
stabilizing arms 256 could be positioned in the reverse orientation
on the catheter central shaft 216. Stabilizing arms of this
configuration would be biased open away from the central shaft 216
and would require a secondary means to retain them in close
proximity to the central shaft 216 in order to be rejacketed before
catheter removal.
[0193] In the embodiment shown in FIGS. 24 through 27, the second
proximal retaining means 226 includes a second proximal release hub
266 positioned over the central shaft 216. The second proximal
release hub 266 may include a small hole or lumen 270 in the
proximal end of the hub 266 that is in fluid communication with the
second proximal release lumen 272 within the central shaft (see
FIGS. 24 and 27). The lumen 270 and 272 desirably includes a
diameter sufficiently large to accommodate at least one second
proximal release wire 268 extending from the handle portion 212 to
beyond the second proximal release hub 266. It is to be appreciated
that the release wire 268 may extend external the shaft 216 as
well.
[0194] The second proximal retaining means 226 holds the main body
prosthesis 120 in a desired configuration prior to deployment (see
FIGS. 19 and 24) and selectively releases the main body prosthesis
120 for the second stage of deployment (see FIG. 26). In the
illustrated embodiment, the distal end of the second proximal
release wire 268 is connected to an actuator or control button or
knob in the handle assembly 212, as will be discussed further
below.
[0195] The main body prosthesis 120 is retained by the second
proximal retaining means 226 in a spaced apart relationship to the
central shaft 216 (see FIG. 24). In the illustrated embodiment, the
second proximal releasing means 230 includes the second proximal
release wire 268 that may extend through at least a portion of the
central shaft 216. The proximal end of the release wire 268 passes
through the lumen 270 of the second proximal release hub 266. The
second proximal release wire 268 is thereby kept in a desired
relationship within or along the central shaft 216. The distal end
of the second proximal release wire 268 is coupled to the second
control knob, such that fore and aft movement of the second knob
moves the second proximal release wire 268, respectively,
proximally and distally.
[0196] 3. Distal Retaining Means
[0197] As can be seen in FIGS. 28 through 33, in the illustrated
embodiment, the distal retaining means 220 comprises at least one
suture, or sutures, 274 and/or equivalent structures, which are
coupled to the prosthetic material 112, or one or more stents 134
on the main body prosthesis 120. Desirably, the suture 274 is
coupled to the prosthesis material 112 near the distal end 110 of
the main body 120, and more desirably near the distal opening 127
of the first lumen 126. The suture 274 is, in turn, looped around
the releasing means 232, e.g., a release wire 282, when the release
wire 282 is in its proximal-most position, as FIGS. 28 and 29A
show. Distal retraction of the wire 282 withdraws the wire 282 from
the suture loop 274, and allows the distal end 110 of the main body
prosthesis 120 to radially expand, as FIG. 30 shows. In an
alternative embodiment, the suture 274 may comprise more than one
suture, i.e., two or more suture loops. FIG. 29B shows the path of
two suture loops 252 looped around the release wire 292.
[0198] As described for the first proximal retaining means, belt
loops or the like may be provided on the main body prosthesis 120
and/or lumen extensions 140 to guide and support the suture loop(s)
along the path of the suture loop. The belt loops can be spaced at
desired circumferential intervals, such as every ninety degrees,
for example.
[0199] In the illustrated embodiment, one end of the suture loop
274 is coupled to the prosthetic material-112 or one or more stents
134 at or near the distal end 110 of the main body prosthesis 120.
The suture loop 274 is then looped around the main body prosthesis
120 and the distal releasing means 232 in a predetermined pattern,
as shown in FIG. 29A, in order to compress and retain the distal
end 110 of the main body prosthesis 120. The free end of the suture
loop 274 is then coupled to the prosthetic material 112 or one or
more stents 134 at or near the proximal end 110 of the main body
prosthesis 120. FIG. 29B shows two separate loops 252 looped around
the main body prosthesis 120 and the release wire 250. It should be
appreciated, however, that suture loop 274 could be coupled to
stents elsewhere in the main body prosthesis 120, and/or the other
components of the main body prosthesis 120 as well.
[0200] The suture loop 274 and releasing means 232, e.g., release
wire 282, of the embodiment just described retain the distal end of
the main body prosthesis 120 to the central shaft 216 (see FIG.
28). The suture loop 274 and the releasing means 232 keep the main
body prosthesis 120 from moving distally as the outer jacket 210 is
retracted. The releasing means 232 also keeps the stent or stents
134 that are retained by the suture loops 274 in a radially
compressed condition as the outer jacket 210 is retracted. The
suture loop 274 and releasing means 232 prevent the distal end 110
of the main body prosthesis 120 from self-expanding until the
releasing means 232 has been withdrawn. In the illustrated
embodiment, the withdrawal of the releasing means 232 is
accomplished by operating a control knob to move the releasing
means 232 distally, withdrawing the releasing means 232 and away
from the suture loop 252. Once the releasing means 232 is
withdrawn, the restrained components of the main body prosthesis
120 are free to self expand, as FIG. 30 shows.
[0201] In the embodiment shown in FIGS. 28 through 31, the distal
releasing means 232 includes a distal release hub 276 positioned
over the central shaft 216 and a release wire 282. The distal
release hub may include a small hole or lumen 278 in the proximal
end of the hub that is in fluid communication with a distal release
lumen 280 within the central shaft 216 (see FIG. 31). Each lumen
278, 280 desirably includes a diameter sufficiently large to
accommodate a distal release wire 282 extending from the handle
assembly 212 to beyond the distal release hub. It is to be
appreciated that the release wire 282 may extend external to the
shaft 216 as well.
[0202] The distal retaining means 220 holds the distal end 110 of
the main body prosthesis 120 in a desired configuration prior to
deployment of the distal end (see FIG. 28) and the distal releasing
means 232 selectively releases the distal end 110 of the main body
prosthesis 120 for the final stage of deployment (see FIG. 30). In
the illustrated embodiment, the distal end of the distal releasing
means 232 is connected to an actuator or control button or knob in
the handle assembly 212, as will be described further below.
[0203] In the illustrated embodiment, the distal releasing means
232 includes the distal release wire 282 that may extend through at
least a portion of the central shaft 216. The proximal end of the
wire 282 passes through the lumen 278 of the distal release hub
276. The proximal end of the distal release wire 282 then may
extend back into the central shaft 216 through the second distal
release hole or lumen 284 positioned spaced apart from the distal
release hub 276. The proximal end of the release wire 282 is
thereby kept in a desired relationship within or along the central
shaft 216. The distal end of the distal release wire 282 is coupled
to the distal control knob, such that fore and aft movement of the
distal control knob moves the distal release wire 282,
respectively, distally and proximally.
[0204] As illustrated and described, the distal releasing means 232
is coupled to the main body prosthesis 120 or a component of the
main body prosthesis, i.e., suture loop 274. It should be
appreciated, however, that the distal releasing means 232 can be
coupled to the main body prosthesis 120 at two or more restrained
regions, so that withdrawal of the distal releasing means 232 frees
the prosthesis at two or more restrained regions. It should also be
appreciated that the distal releasing means 232 can comprise more
than a single releasing element. For example, multiple, individual
releasing wires 282 could be coupled to the main body prosthesis
120 at different regions, so that release of separate regions of
the distal end of the main body prosthesis 120 can be individually
controlled.
[0205] In an alternative embodiment, the distal retaining means 220
may comprise the prosthesis material 112. As can be seen in FIG.
32, the distal release wire 282 may be threaded through the
prosthesis material 112 near the distal end 110 of the main body
prosthesis 120, e.g., the first lumen 126. The distal release wire
282 then desirably extends into the second distal lumen 284. The
proximal end of the release wire 282 is thereby kept in a desired
relationship within or along the central shaft 216 to retain the
wire 282. In this configuration, the distal stent(s) 134 are not
radially restrained. As the outer jacket is retracted, the distal
end 110 of the main body prosthesis 120 is free to radially expand.
The distal release wire 282 serves to maintain the position of the
distal end 110 relative to the catheter shaft 216. This feature
allows for a greater flow of fluid through the lumens of the main
body prosthesis while still maintaining longitudinal or axial
control of the main body prosthesis 120 during the deployment
process. In the illustrated embodiment, the withdrawal of the
release wire 282 is accomplished by operating a control knob to
move the release wire 282 distally, withdrawing the release wire
282 from the prosthesis material 112 and releasing the restrained
components of the main body prosthesis 120 from the catheter shaft
216, as FIG. 33 shows.
[0206] B. The Outer Jacket
[0207] As previously described, the outer jacket 210 serves to
restrain the stents 130, 134 on the main body prosthesis 120 from
expanding and allows for a controlled deployment of the main body
prosthesis 120 within the body (see FIG. 14A). In the illustrated
arrangement, the outer jacket 210 is coupled to an actuator or knob
302 on the handle assembly 212, as will be described in greater
detail below.
[0208] As FIG. 14A shows, the outer jacket 210 extends proximally
over the spacer 206 and main body prosthesis 120 and terminates
adjacent the distal end 242 of the catheter tip component 222.
Typically, the outer jacket 210 can be made of a polymer tube or
similar materials known in the art. In one embodiment, the jacket
210 may be free of structural reinforcement. In an alternative
embodiment (shown in FIG. 14B), the jacket 210 may include
structural reinforcement, such as but not limited to, a wire or rod
211 positioned longitudinally along a length of the jacket, and/or
a wire or rod 213 positioned helically around a length of the
jacket. The structural reinforcement may also be in the form of a
coil(s) or braided wire, for example. The plasticity of the
structural reinforcement may be altered to affect the flexibility
of the jacket 210 depending on a selected application. In addition,
the structural reinforcement may extend along the full length of
the jacket 210, or may be positioned along only a portion or
portions of the length of the jacket. The structural reinforcement
may be embedded within the jacket 210, or may be coupled to the
interior or exterior surface of the jacket.
[0209] In the illustrated embodiment, the outer jacket 210 is
configured to maintain a consistent diameter throughout its entire
length (see FIG. 11). The outer jacket may also be tapered due to a
difference in outer diameters of the catheter tip component 222.
The diameter of the outer jacket 210 is intended to contain the
main body prosthesis 120, and optionally an extension portion 140
or portions of the main body prosthesis 120, if present. The outer
diameter continues distally to the handle assembly 212. The
relatively small size of the outer diameter of the outer jacket 210
also allows for better blood circulation passed the deployment
catheter 200.
[0210] Returning to FIG. 14A, the spacer 206 provides support for
the outer jacket 210 and, by occupying space within the outer
jacket 210, reduces the amount of air entrapped within the
deployment catheter 200. The proximal end of the spacer 206
desirably terminates adjacent the distal end 110 of the main body
prosthesis 120. In this arrangement, the cavity 234 containing the
main body prosthesis 120 extends from the distal end 242 of the
catheter tip component 222 to the proximal end of the spacer 206.
As FIG. 14A shows, the spacer 206 is positioned over the central
shaft 216 and the distal end of the spacer 206 is connected to the
handle assembly 212. Typically, the spacer 206 can have an outer
diameter slightly less than the inner diameter of the outer jacket
210. The spacer 206 can comprise a single lumen or an array of
multiple lumens for passage of the various components within the
spacer 206.
[0211] C. Handle Assembly
[0212] The handle assembly 212 provides the operator with
longitudinal or axial control and rotational control of the
deployment catheter 200 within the body and provides access to the
actuator(s) or control means for deploying the main body prosthesis
120.
[0213] Referring to FIGS. 34 through 36, the handle assembly 212
comprises a handle, body 290, a jacket retraction means 292, which
is connected to the distal end of the outer jacket 210, a sliding
knob 294 which may also be connected to the distal end of the outer
jacket 210, and at least one actuator or knob which is attached to
the distal end of the proximal and distal releasing means.
Desirably, the handle 212 comprises a separate knob for each of the
first proximal releasing means 228, the second proximal releasing
means 230, and the distal releasing means 232.
[0214] In the illustrated embodiment, the central shaft 216 is
captured within the handle 212 and has a guide wire receiving luer
296 and an infusion valve 297 coupled to its distal end, which is
located at the distal end of the handle assembly 212 (see FIGS. 37
and 38). This feature prevents the position of the main body
prosthesis 120 from moving relative to the handle body 212 while
the outer jacket 210 is retracted, and allows for irrigation or
flushing of the catheter shaft 216, such as with a saline
solution.
[0215] To withdraw the outer jacket 210 from the catheter tip 222
and expose the proximal end of the main body prosthesis 120 (see
FIGS. 37 through 40), the jacket retraction means 292 is used. The
jacket retraction means 292 may include a variety of different
mechanisms to selectively control the retraction of the jacket 210
from the catheter tip 222. In the illustrated embodiment, the
jacket retraction means 292 comprises a rack and pinion type
control mechanism to provide a mechanical advantage sufficient to
withdraw the jacket 210 from the catheter tip 222. A pinion 298 is
carried by a gear axle 300, and is rotated by a starting knob 302
positioned on at least one end of the gear axle 300, as best seen
in FIG. 41. A single starting knob may be present, or as shown in
FIGS. 39 and 40, two co-acting starting knobs 302 may be available
for the clinician, one positioned on a first side 304 and one
positioned on a second side 306 of the handle 212. A complimentary
rack 308 is carried by a jacket slide 310. The pinion 298 controls
distal movement of the rack 308 along the jacket slide 310 between
a first (jacket extended) position 312, shown in FIG. 39, and a
second (jacket retracted) position 314, shown in FIG. 40.
[0216] The jacket slide 310 is coupled to the jacket 210 and is
temporarily coupled to the gear rack 308 via a spring loaded
connecting pin 316. The connecting pin 316 disengages the jacket
slide 310 at a predetermined position in the handle body 290 by
springing or otherwise retracting into a recess 318 in the handle
body 290. When the connecting pin 316 disengages, the jacket slide
310 is free to travel in both a proximal and distal direction
without re-engaging the rack 308. The rack 308 desirably remains in
this retracted position 314. A ratchet pawl, such as a spring
backed ratchet pawl 320 may be coupled to the rack 308 to allow the
rack to travel in a distal direction, but restrict proximal travel
of the rack 308. Ratchet teeth 322 may be provided in the handle
body 290 to engage the ratchet pawl 320.
[0217] Once the jacket slide 310 has traveled distally and the rack
308 has been disengaged, the jacket sliding knob 294 may then be
used to continue the retraction of the jacket 210 from the main
body prosthesis 120. The jacket slide 310 is moved distally until
the outer jacket 210 is free of the main body prosthesis 120 (see
FIG. 60, for example). The portion or portions of the main body
prosthesis 120 that are not coupled to the proximal and distal
retaining means 218, 220, are free to self-expand, as FIG. 60
shows. However, the portions of the main body prosthesis 120 that
are coupled to the proximal and distal retaining means 218, 220,
are still restrained from self-expansion, despite withdrawal of the
outer jacket 210, as FIG. 60 also shows. The stent structure of the
main body prosthesis 120 is thereby kept restrained in a close
relationship against the central shaft 216 while the outer jacket
210 is retracted. The proximal and distal retaining means 218, 220
prevents the main body prosthesis 120 from moving relative to the
central shaft 216 during retraction of the outer jacket 210, which
potentially minimizes blood flow through the main body prosthesis
120 during the deployment process. Furthermore, as described, the
main body prosthesis 120 is not "pushed out" of the catheter. The
main body prosthesis 120 therefore need not have longitudinal
stiffness or a stent structure with a "spine".
[0218] To employ the first proximal retaining means 224, the first
proximal sliding knob 322 (see FIG. 34) is moved distally until the
proximal end of the first proximal releasing means 228 is withdrawn
from the first proximal retaining means 224, as previously
described. In the illustrated embodiment, the first proximal
release wire 250 is positioned within the loops of the suture loop
252, as seen in FIGS. 17 and 18A. As the first proximal release
wire 250 is withdrawn from the suture loop 252, the suture loop 252
releases its retentive feature, yet may remain coupled to the
prosthesis material 112. The proximal end 108 of the main body
prosthesis 120 is thereby free to self-expand to its first stage
deployment configuration, as FIG. 19 shows.
[0219] The same process is repeated for the second proximal
retaining means 226 and the distal retaining means 220. To employ
the second proximal retaining means 226, the second proximal
sliding knob 324 (see FIG. 35) is moved distally until the proximal
end of the second proximal releasing means 230 is withdrawn from
the second proximal retaining means 226, as previously described.
The proximal end 108 of the main body prosthesis 120 is thereby
finally released from the catheter shaft 216, as FIG. 26 shows. To
employ the distal retaining means 220, the distal sliding knob 326
(see FIG. 35) is moved distally until the proximal end of the
distal releasing means 232 is withdrawn from the distal retaining
means 220. The distal end 110 of the main body prosthesis 120 is
thereby free to self-expand to its final deployment configuration,
as FIG. 30 shows. Each of these steps will be described in greater
detail in section V. It is to be appreciated that the sliding
buttons or knobs may all be positioned on the first side 304 of the
handle, or all may be positioned on the second side 306 of the
handle, or may be positioned with one or more on the first side 304
and one or more on the second side 306, as shown. It should also be
appreciated that the knobs 322, 324, 326, can comprise separate
components that are not part of the handle assembly 212, i.e., on
the outer jacket 210.
[0220] The proximal and distal retaining means 218, 220, desirably
cooperate with a release system 328 positioned within the handle
housing 290 (see FIGS. 37 and 38). Each sliding knob 322, 324; 326,
is coupled to a release slide 330, 332, 334, respectively,
positioned within a track 336, 338, 340, respectively, in or on the
release system 328 (see FIGS. 41 through 43). Each release slide is
coupled to the distal end of the releasing means, such as a release
wire. It is to be appreciated that the release system 328 may also
include an interlock system, such as a mechanical linkage for
controlling the order by which the slides may be moved. In
addition, an interlock system could also include a mechanical
linkage to the jacket retraction slide 310. This feature would
prevent the activation of the release slides until the jacket had
been retracted to a predetermined position. It is also to be
appreciated that the sliding knobs may include a symbol to indicate
to the clinician an appropriate order of deployment.
[0221] As described, the main body prosthesis 120 is not released
immediately from proximal end to distal end as the jacket 210 is
withdrawn. The proximal and distal stent or stents 130, 134, are
released in a secondary operation, which follows the withdrawal of
the outer jacket 210. Placement of the prosthesis extensions 140
can therefore comprise a next step in the deployment process.
[0222] 1. Lumen Extension Deployment Catheter
[0223] After the main body of the prosthesis 120 has been partially
or completely deployed, a lumen extension 140, or lumen extensions,
are next to be implanted. An extension deployment catheter 350 is
shown in FIG. 44. It is to be appreciated that the extension
deployment catheter 350 may incorporate all the features disclosed
in the description of the deployment catheter 200. The extension
catheter is used for delivery and deployment of the lumen
extensions 140 to the targeted site.
[0224] In the illustrated embodiment, the extension catheter 350
carries the lumen extension 140 in a radially reduced configuration
to the targeted site. At the targeted site, the extension catheter
350 releases the radially reduced lumen extension 140, which
expands radially, and is coupled to a lumen of the main body
prosthesis 120, as will be described further in section V.
[0225] As shown in FIGS. 44 through 45B, the extension catheter 350
comprises an inner assembly 358, an outer jacket 360, and a handle
assembly 362. These components will now be individually described
in greater detail.
[0226] a. The Inner Assembly
[0227] In the illustrated embodiment (see FIG. 45A), the inner
assembly 358 comprises a central shaft 364, which functions as a
carrier for the lumen extension 140, proximal retaining means 366,
and an extension catheter tip component 368. The proximal retaining
means 366 desirably retains at least a portion of the lumen
extension 140 in a radially compressed or partially radially
expanded condition prior to deployment and prior to coupling to the
main body prosthesis 120. The proximal retaining means 366 also
desirably includes a co-acting releasing means or mechanism 370 for
maintaining the proximal retaining means 366 in a desired
relationship with the lumen extension 140 prior to activation.
[0228] In an alternative embodiment (see FIG. 45B), the inner
assembly may also include distal retaining means 367. The distal
retaining means 367 desirably retains at least the distal portion
of the lumen extension 140 in a radially compressed or partially
radially expanded condition prior to deployment and prior to
coupling to the main body prosthesis 120. The distal retaining
means 367 also desirably includes a co-acting releasing means or
mechanism 371 for maintaining the distal retaining means 367 in a
desired relationship with the lumen extension 140 prior to
activation.
[0229] b. The Central Shaft
[0230] In the embodiments shown in FIGS. 45A and 45B, the central
shaft 364 and the proximal and distal retaining means 366, 367 are
located within the confines of the outer jacket 360. In this
respect, the outer jacket 360 functions as an enclosure or jacket
for the lumen extension 140 on the shaft 364 (see FIGS. 46A and B).
In this arrangement, the catheter tip component 368 is attached to
the proximal end of the central shaft 364, and the proximal end of
the outer jacket 360 terminates adjacent the catheter tip component
368. Thus, the extension catheter tip component 368 extends outward
beyond the outer jacket 360. The central shaft 364, the proximal
releasing means 366, the distal releasing means 367 (shown in FIG.
45B), and the outer jacket 360 are coupled to the handle assembly
362 at the proximal end of the catheter handle assembly 362 (see
FIG. 44). As can be seen in FIGS. 46A and 46B, the lumen extension
140 is contained in a cavity 372 defined between the central shaft
364 and the outer jacket 360 in the proximal section of the
extension catheter 350.
[0231] The central shaft 364 extends from the handle assembly 362
to the catheter tip component 368. The central shaft 364 may be
made, e.g., from stainless steel or other suitable medical
materials including other metals or polymers. The central shaft 364
comprises at least one lumen, and may comprise more than one
lumen.
[0232] One lumen may be described as the central lumen 374 (see
FIGS. 47A and 47B), with an inner diameter between 0.010 and 0.120
inches, desirably between 0.020 and 0.060 inches and most desirably
between 0.030 and 0.050 inches. As described, the central lumen 374
allows for the insertion of a guide wire, i.e., the first guide
wire 30 or the second guide wire 40, up to 0.038'' diameter, for
example. The catheter tip component 368, having the same features
as described for the catheter tip 222 of the deployment catheter
200, also desirably has at least one lumen 376 (see FIG. 45A)
configured to align with at least one lumen within the central
shaft 364. This lumen 376 allows for the insertion of the guide
wire through the central shaft 364 and through the extension
catheter tip component 368. Typically this lumen 376 will have an
inner diameter between 0.010 and 0.120 inches, desirably between
0.020 and 0.060 inches and most desirably between 0.030 and 0.050
inches.
[0233] c. Proximal Retaining Means
[0234] The proximal retaining means 366 and the proximal releasing
means 370 may function in the same or similar fashion as the
retaining means 224, 226, and the releasing means 228, 230 embodied
in the deployment catheter 200, as previously shown and described.
As can be seen in FIGS. 46A and 48A, in the illustrated embodiment,
the proximal retaining means 366 comprises at least one suture, or
sutures, 378 and/or equivalent structures, which are coupled to the
lumen extension prosthetic material 112, or to one or more stents
150 on the lumen extension 140. The suture 378 is, in turn, looped
around the proximal releasing means 370, e.g., a release wire 380,
when the release wire 380 is in its proximal-most position, as
FIGS. 46A and 48A show. Distal retraction of the wire 380
positioned within a releasing wire lumen 381 (see FIGS. 45A and
47A) withdraws the wire 380 from the suture loop 378, and allows
the proximal end 142 of the lumen extension 140 to radially expand,
as can be seen in FIGS. 70 and 71. In an alternative embodiment,
the suture 378 may comprise more than one suture, i.e., two or more
suture loops. FIG. 48C shows the path of two suture loops 378
looped around the release wire 380.
[0235] As described for the main body prosthesis 120, belt loops or
the like may be provided on the lumen extensions 140 as well to
guide and support the suture loop(s) along the path of the suture
loop. The belt loops can be spaced at desired circumferential
intervals, such as every ninety degrees, for example.
[0236] As can be seen in FIG. 45A, the proximal releasing means 370
comprises a proximal release hub 397 positioned over the central
shaft 364, and the release wire 380. The proximal release hub 397
may include a small hole or lumen 398 in the proximal end of the
hub 397 that is in fluid communication with the proximal releasing
wire lumen 381 within the central shaft 364. Each lumen 381, 398
desirably include a diameter sufficiently large to accommodate the
release wire 380 extending from the handle assembly 362 to beyond
the release hub 397. It is to be appreciated that the release wire
380 may extend external the shaft 364 as well.
[0237] d. Distal Retaining Means
[0238] In an alternative embodiment, the distal retaining means 367
and the distal releasing means 371 may function in the same or
similar fashion as the retaining means 220, and the releasing means
232 embodied in the deployment catheter 200, as previously shown
and described. As can be seen in FIGS. 46B and 48B, the distal
retaining means 367 comprises at least one suture, or sutures, 379
and/or equivalent structures, which are coupled to the lumen
extension prosthetic material 112, or to one or more stents 150 on
the lumen extension 140. The suture 379 is, in turn, looped around
the distal releasing means 371, e.g., a release wire 383, when the
release wire 383 is in its proximal-most position, as FIGS. 46B and
48B show. Distal retraction of the wire 383 positioned within a
releasing wire lumen 385 (see FIGS. 45B 47B) withdraws the wire 383
from the suture loop 379, and allows the distal end 144 of the
lumen extension 140 to radially expand. As described for the
proximal retaining means 366, the suture 379 may also comprise more
than one suture, i.e., two or more suture loops. FIG. 48C shows the
path of two suture loops 378 looped around the release wire 380.
This path may also be used for suture loops 379 looped around the
release wire 383.
[0239] As can be seen in FIG. 45B, the distal releasing means 371
comprises a distal release hub 399 positioned over the central
shaft 364, and the release wire 383. The distal release hub 399 may
include a small hole or lumen 395 in the proximal end of the hub
399 that is in fluid communication with the distal releasing wire
lumen 385 within the central shaft 364. Each lumen 385, 395
desirably include a diameter sufficiently large to accommodate the
release wire 383 extending from the handle assembly 362 to beyond
the release hub 399. It is to be appreciated that the release wire
383 may extend external the shaft 364 as well.
[0240] B. The Outer Jacket
[0241] The outer jacket 360 may function in the same or similar
fashion as described for the outer jacket 210 embodied in the
deployment catheter 200. The outer jacket 360 also serves to
restrain the stents 146 and 150 on the lumen extension 140 from
expanding and allows for a controlled deployment of the lumen
extension 140 within a lumen of the main body prosthesis 120. In
the illustrated arrangement, the outer jacket 360 is coupled to an
actuator or knob 382 on the handle assembly 362, as will be
described in greater detail below.
[0242] As FIGS. 46A and 46B show, the outer jacket 360 extends
proximally over a spacer 384 and lumen extension 140 and terminates
adjacent the distal end of the catheter tip component 368.
Typically, the outer jacket 360 can be made of a polymer tube or
similar materials known in the art. In one embodiment, the jacket
360 may be free of structural reinforcement. In an alternative
embodiment (shown in FIG. 46C), the jacket 360 may include
structural reinforcement, such as but not limited to, a wire or rod
361 positioned longitudinally along a length of the jacket, and/or
a wire or rod 363 positioned helically around a length of the
jacket. The structural reinforcement may also be in the form of a
coil(s) or braided wire, for example. The plasticity of the
structural reinforcement may be altered to affect the flexibility
of the jacket 360 depending on a selected application. In addition,
the structural reinforcement may extend along the full length of
the jacket 360, or may be positioned along only a portion or
portions of the length of the jacket. The structural reinforcement
may be embedded within the jacket 360, or may be coupled to the
interior or exterior surface of the jacket.
[0243] If desired, and as shown in FIG. 44B, a stationary outer
jacket 365 may be provided that extends from the proximal end of
the handle assembly 362. The jacket 360 slides within the
stationary jacket 365. The stationary jacket 365 provides a seal
interface with a hemostatic valve at the access site. The
stationary jacket 365 can be made of a suitable medical grade
plastic, such as Fluorinated Ethylene Propylene (FEP) as
non-limiting example. The stationary outer jacket 365 provides
column strength and lubricity to reduce friction during sliding
actuation of the jacket 360. The stationary outer jacket 365 may
also be provided for the prosthesis deployment catheter 200 for the
same purposes.
[0244] C. Handle Assembly
[0245] The handle assembly 362 may function in the same or similar
fashion as described for the handle assembly 212 embodied in the
deployment catheter 200. The handle assembly 362 provides the
operator with longitudinal or axial control and rotational control
of the extension deployment catheter 350 within the body and
provides access to the actuator(s) or control means for deploying
the lumen extension 140.
[0246] Referring to FIGS. 49 and 50, the handle assembly 362
comprises a handle body 386, a jacket retraction means 382, which
is connected to the distal end of the outer jacket 360, and at
least one knob or button 392 which is attached to the distal end of
the proximal releasing means 370. It is to be appreciated that the
handle assembly 362 may also include at least one knob or button
393 (see FIG. 49B) attached to an optional distal releasing means
371 and the knob or button may function in the same or similar
fashion as described below for the proximal releasing means
370.
[0247] In the illustrated embodiment, the central shaft 364 is
captured within the handle 362 and has a guide wire receiving luer
388 and an infusion valve 390 coupled to its distal end, which is
located at the distal end of the handle assembly 362 (see FIGS. 50
and 51). This feature prevents the position of the lumen extension
140 from moving relative to the handle body 362 while the outer
jacket 360 is retracted, and allows for irrigation or flushing of
the catheter shaft 364, such as with a saline solution.
[0248] To withdraw the outer jacket 360 from the catheter tip 368
and expose the lumen extension 140, jacket retraction means, such
as the jacket retraction knob 382 may be used. The jacket
retraction means 382 may include a variety of different mechanisms
to selectively control the retraction of the jacket 360 from the
catheter tip 368. In the illustrated embodiment, the jacket
retraction means comprises two co-acting retraction knobs 382 which
are available for the clinician, one positioned on each side of the
handle 362.
[0249] The jacket retraction knob 382 is used to retract the jacket
360 from the lumen extension 140. The jacket retraction knob 382 is
moved distally until the outer jacket 360 is free of the lumen
extension 140 (see FIG. 70). The portion or portions of the lumen
extension 140 that are not coupled to the proximal retaining means
366 are free to self-expand, as FIG. 70 shows. However, the
portions of the lumen extension 140 that are coupled to the
proximal retaining means 366 are still restrained from
self-expansion, despite withdrawal of the outer jacket 360. The
stent structure of the lumen extension 140 is thereby kept
restrained in a close relationship against the central shaft 364
while the outer jacket 360 is retracted. The proximal retaining
means 366 prevents the lumen extension 140 from moving relative to
the central shaft 364 during retraction of the outer jacket 360,
which potentially minimizes blood flow through the lumen extension
140 during the deployment process. Furthermore, as described, the
lumen extension 140 is not "pushed out" of the extension catheter
350. The lumen extension 140 therefore need not have longitudinal
stiffness or a stent structure with a "spine".
[0250] To employ the proximal retaining means 366, the proximal
release sliding knob 392 (see FIGS. 49A and 50) is moved distally
until the proximal end of the proximal releasing means 370 is
withdrawn from the proximal retaining means 366, as previously
described. In the illustrated embodiment, the proximal release wire
380 is positioned within the loops of the suture loop 378, as seen
in FIGS. 46A and 48A. As the proximal release wire 380 is withdrawn
from the suture loop 378, the suture loop 378 releases its
retentive feature, yet may remain coupled to the prosthesis
material 112. The proximal end 142 of the lumen extension 140 is
thereby free to self-expand to its deployment configuration and
couple itself within the lumen of the main body prosthesis 120, as
FIGS. 70 and 71 show. The natural flow of fluid through the new
extension 140 provides sufficient force to cause the restraint
mechanism of the lumen extension 140 to engage the co-acting
restraint mechanism of the main body prosthesis 120. The lumen
extension stent and/or the outwardly extending apices 147 of the
lumen extension stent 150 engage the mating outwardly extending
apices 136 of the main body prosthesis stent 134 (see FIG. 10B).
Each of these steps will be described in greater detail in section
V. It is to be appreciated that the sliding buttons or knobs may
all be positioned on one side of the handle, or all may be
positioned on the opposite side of the handle, or may be positioned
on both sides, as shown. It should also be appreciated that the
knobs 382 and 392 can comprise separate components that are not
part of the handle assembly 362, i.e., on the outer jacket 360.
[0251] The proximal retaining means 366 desirably cooperate with a
release system 394 positioned within the handle housing 386.
Proximal release sliding knob 392 is coupled to a release slide 396
positioned within a track 398 in or on the release system 394 (see
FIG. 51). The release slide 396 is coupled to the distal end of the
releasing means 370, such as the release wire 380. It is to be
appreciated that the release system 394 may also include an
interlock system, such as a mechanical linkage for controlling the
order by which the slides may be moved. In addition, an interlock
system could also include a mechanical linkage to the jacket
retraction slide 382. This feature would prevent the activation of
the release slides until the jacket had been retracted to a
predetermined position. It is also to be appreciated that the
sliding knobs may include a symbol to indicate to the clinician an
appropriate order of deployment.
[0252] As described, the lumen extension 140 is not released
immediately from proximal end to distal end as the jacket 360 is
withdrawn. The lumen extension stent or stents 146 and 150 may be
released in a secondary operation, which follows the withdrawal of
the outer jacket 360. Placement of the prosthesis extensions 140
can therefore comprise a final step in the deployment process.
[0253] D. Fastener Device And Fastener
[0254] As previously described, one or more fasteners 402 (see FIG.
52) may be introduced by a fastener device 400 to anchor the
prosthesis 100 in place. Typically the fasteners 402 will be
introduced at the proximal end of the main body prosthesis 120;
however, it should be appreciated that the fasteners can be
introduced in any part of the prosthesis 100, including the lumen
extensions 140, to anchor it in place. In addition, the fasteners
402 may also serve to provide apposition of the prosthesis material
112 to the hollow body organ or vessel wall. Fasteners may also be
used to seal and/or repair leaks or seepage of fluid (e.g., around
the proximal stents and/or distal stents of the prosthesis 100).
One or more fasteners 402 may be introduced into the prosthesis 100
at different times or at the same time during the procedure.
[0255] As can be seen in FIGS. 53 and 54, the fastener tool 400
desirably comprises a handle assembly 404 including a control
assembly 406 and an indication assembly 408. A fastener delivery
shaft 409, having a fastener driver 411 at its proximal end 410, is
coupled to the proximal end of the handle assembly 404 for delivery
of the fastener 402. Coupled to the distal end of the handle
assembly may be an irrigation port or infusion valve 422.
[0256] The handle assembly 404 provides the fastening control
feature for the clinician. Positioned within the handle assembly
404 is the control assembly 406. The control assembly provides
motion control, such as a forward and reverse drive feature, for
turning or otherwise moving the fastener 402 to or from a fastening
position. The control assembly desirably includes a forward control
button 412 and a reverse control button 414. The forward and
reverse control buttons 412, 414 provide the clinician an ergonomic
and single finger control of the fastener device 400.
[0257] The handle assembly desirably includes an indication
assembly 408 to provide control information to the clinician. The
indication assembly may include indication lights, i.e., LEDs,
and/or the ability to produce audible signals (tones) to provide
visual and/or audible indication of forward or reverse movement of
the fastener 402, for example, by way of a variety of tones and/or
a forward light 416 and a reverse light 418. Additionally, the
indication assembly may include status tones and/or a status light
420 to provide a variety of information back to the clinician. The
tones may use a variety of pitches or pulses, for example, and the
status light 420 may use a variety a flash signals and illumination
times, for example, to provide these different indications for the
clinician, such as error indication, position indication, and
timing indication, for example.
[0258] Further details of the fastener device 400 and fastener 402
can be found in U.S. patent application Ser. No. 10/307,226, filed
Nov. 29, 2002, and entitled "Intraluminal Prosthesis Attachment
Systems and Methods," and in U.S. patent application Ser. No.
10/786,465, filed Feb. 29, 2004 and entitled "Systems and Methods
for Attaching a Prosthesis Within a Body Lumen or Hollow Organ,"
which are both incorporated herein by reference.
[0259] In this embodiment, the proximal coil 422 of the fastener
402 is formed to produce a diagonal member 424, which crosses the
diameter of the helical fastener. The distal end of the fastener
402 comprises a sharpened tip 426, such as a conical tip or a
chiseled tip, for example, to aid in the ease of tissue
penetration. Similar helical fasteners are described in U.S. Pat.
Nos. 5,964,772; 5,824,008; 5,582,616; and 6,296,656, the full
disclosures of which are incorporated herein by reference.
[0260] In an alternative embodiment, the fastener device 400 and a
fastener 430 may comprise features allowing the fastener 430 to be
releasably secured to the fastener driver 432. As can be seen in
FIGS. 79A and 79B, the proximal coil 434 of the helical fastener
430 desirably includes a diagonal member 436, which crosses the
diameter of the fastener 430. The diagonal member 436 may bisect
the diameter of the fastener 430, or may be offset, forming a "D"
shaped proximal coil 434, as shown. The diagonal member 436
desirably comes completely across the diameter to prevent the
fastener 430 from being an open coil and to control the depth of
penetration into the tissue. In addition, the diagonal member 436
can be attached to a previous coil, as shown, to strengthen the
entire structure and provide a retentive shape for a fastener
driver 432. This attachment could be achieved via welding, adhesive
or any other suitable means.
[0261] Located at the proximal end of the fastener delivery shaft
410 is the fastener driver 432. In the illustrated embodiment (see
FIGS. 80 and 81), the fastener driver 432 includes a fastener
carrier 438 positioned within a threaded fastener housing 439. The
threaded fastener housing 439 may include tabs 437 or other
coupling means so as to snap fit or couple to the fastener carrier
438 for convenient replacement. The coupling between the driver 432
and carrier 438 can take different forms e.g., magnets, graspers,
or other suitable mechanical connection. In the embodiment
illustrated in FIGS. 80 and 81, the driver 432 and carrier 438 are
integrally connected as a single unit.
[0262] The carrier 438 is sized and configured to engage a selected
fastener 430. The diagonal member 436 serves to define a shape,
such as a "D" shape, to engage the carrier 438, which rotates the
fastener 430 positioned over the carrier 438 to achieve fastening
the prosthesis to tissue. The diagonal member 436 also serves as a
stop to prevent the helical fastener 430 from penetrating too far
into the tissue.
[0263] As can be seen in FIGS. 80 and 81, a fastener 430 is
positioned within the fastener housing 439 and over the carrier
438. The carrier 438 includes a release latch 440. The release
latch 440 may be spring loaded, magnetic, or lever action, for
example. The latch 440 prevents the premature release of the
fastener 430. The release latch 440 desirably requires a force to
overcome the securing force of the latch. For example, the release
latch 440 may be overcome by a pulling force, e.g., the fastener
430 is being fastened through the prosthesis and within tissue and
the pulling force of the fastener turning or screwing into tissue
may overcome the securing force of the release latch.
Alternatively, the release latch 440 may be overcome by a magnetic
force activated by the clinician by pressing a release button 444
on the handle assembly 404 (shown in FIG. 86). In one embodiment
shown in FIGS. 82A and 82B, the release latch 440 includes a lever
arm 442 to provide the latching force. As the carrier 438 is
rotated to deploy the fastener 430, the force of the fastener 430
rotating into the tissue may be adequate to overcome the force of
the release latch 440. As seen in FIG. 82A, the fastener 430
remains fastened to the carrier 438 by way of the fastener release
latch 440. As seen in FIG. 82B, further rotation of the fastener
430 into tissue will cause each coil of the fastener to overcome
the force of the release latch 440 and allow the fastener 430 to
exit off of the carrier 438.
[0264] In an alternative embodiment, the release latch 440 may
include a release spring 445, as seen in FIG. 82C. The release
spring 445 is sized and configured to provide a sufficient force to
maintain the fastener 430 on the carrier 438, and yet allow the
fastener 430 to overcome the force of the release spring 445 and
release latch 440 as the fastener is being screwed into tissue.
[0265] The fastener housing 439 desirably includes a predetermined
amount of internal threads 441 (e.g., two or three threads). In
this configuration, the threaded portion of the housing 439 may not
be continuous throughout the length of the housing. The threads 441
engage the fastener 430 when the fastener is being loaded onto the
fastener driver 432 (as described below) and also partially drive
the helical fastener 430 out of the fastener driver 432 and into
tissue. Desirably, the threaded portion of the threaded housing
terminates a predetermined distance from the housing tip 443. This
unthreaded portion of the threaded housing 439 provides an area in
which the fastener 430 can be rotated but not be driven out of the
fastener driver 432. This unthreaded feature of the housing 439
allows the fastener 430 to pull itself out of the fastener driver
432 when rotated by the driver only as long as the fastener 430 has
been previously engaged with the prosthesis 120 and tissue. This
feature ensures a more uniform depth of penetration for the
fastener 430.
[0266] A helical fastener, such as 402 and 430, for example, may be
positioned in a fastener cassette 446, as seen in FIGS. 83 and 84.
The fastener cassette 446 may take on any convenient shape, such as
a rectangle or circle, as shown, and may include any convenient
number of fastener receptacles 448, such as six, although any
number may be used. The cassette 446 may be used to store and
retain fasteners during shipment, and also to provide a convenient
means to present the fastener 430, for example, to the fastener
device 400 during a medical procedure.
[0267] As seen in FIGS. 83 and 84, the fastener receptacle 448 is
sized and configured to allow the proximal end 410 and the fastener
driver 432 of the fastener device 400 access to the seated fastener
430. The fastener 430 may be positioned on a receptacle post 449,
to hold the fastener 430 within the receptacle 448. Or alternately,
the fastener 430 may be held within the receptacle 448 through
interference between the fastener 430 and the receptacle 448, or by
penetrating the fastener tip 426 into a material at the base of the
receptacle 448. The receptacle post 449 may include a receptacle
post spring 447, allowing the receptacle post 449 to retreat into
the receptacle 448 as the fastener driver 432 is inserted into the
receptacle 448 to position the fastener 430 on to the carrier
438.
[0268] FIGS. 85 and 86 show an embodiment of a fastener 430 being
positioned within the fastener driver 432. As can be seen the
fastener driver 432 is positioned on top of the receptacle 448 and
gently inserted into the receptacle. The force of the insertion
allows the fastener 430 to overcome the force of the release latch
440 on the carrier 438 and to be positioned over the carrier 438.
The fastener driver is then reversed, using the control assembly
406 provided on the fastener driver handle 404. The internal
threads 441 of the threaded housing 439 draw the fastener 430 into
the fastener driver 432 and into position for deployment. FIG. 86
shows the fastener 430 removed from the cassette 446 and positioned
on the fastener driver 432. It is to be appreciated that the
cassette 446 can be used to hold a variety of fastener shapes and
sizes, and is not limited to the fastener 430, as described.
[0269] E. Steerable Guide Device
[0270] A steerable guide device 450 may be used to establish an
open path through which an operative tool, such as the fastener
device 400, can be deployed for use. FIGS. 55 and 56 show an
embodiment of the steerable guide device 450. The steerable guide
device comprises a flexible guide tube 452 carried by a handle 454.
The handle is sized and configured to be ergonomically held by the
clinician to introduce the guide tube 452 to the targeted site.
[0271] In order to establish an open path for the fastener device
400, the steerable guide device 450 includes an interior guide
passage 456 which extends through the interior portion of the
handle 454 continuously and into and through the guide tube 452.
The distal end of the handle 454 may also include a seal 457 to
restrict the flow of fluids through the guide tube 452. During
introduction of the guide tube through the vasculature to the
targeted site, an obturator or dilator 458 having a tip component
459 (see FIG. 57) is positioned within the guide tube 452 in order
to seal the guide tube and restrict the flow of fluids through the
guide tube 452, to provide an atraumatic tip for guiding through
the vasculature, and to provide a guide wire lumen 470.
[0272] The handle assembly desirably includes a rotatable steering
assembly 460 and a flushing port 462. The steering assembly 460 is
used to deflect the proximal end 464 of the guide tube 452 to a
bent or deflected configuration, as will be described later. The
steering assembly 460 is rotated in a desired direction, causing
the proximal end 464 to bend or deflect in a predetermined
configuration. A radiopaque marker 466 can be placed on the
proximal end region 464 of the guide tube 452 to allow for
fluoroscopic visualization of the orientation of the deflected end
region. In the bent or deflected configuration, the proximal end
464 can be oriented in a desired relationship with the targeted
site.
[0273] Further details of the steerable guide device 450 can be
found in U.S. patent application Ser. No. ______, (to be supplied),
filed 20 Oct. 2005, and entitled "Devices, Systems, and Methods for
Guiding an Operative Tool Into an Interior Body Region," which is
incorporated herein by reference.
V. DETAILED IMPLANTATION METHODS
[0274] The generally described steps of implantation of the
prosthesis 100 provided in Section II will now be described in
greater detail. In the illustrated embodiment, deployment of the
bifurcated prosthesis 100 may generally be achieved in a twelve
step process, for example, and is shown generally in FIGS. 58
through 78. The exemplary embodiment will describe the systems,
methods, and uses of the tools for implanting the prosthesis 100.
It is to be understood that these same or similar systems, methods,
and tools may be used to implant other prosthesis configurations in
other areas of the body as well. Throughout the implantation
process, image guidance may be used and in conjunction with
radiopaque markers positioned on the prosthesis 100 and deployment
tools.
[0275] Access to the vascular system is commonly provided through
the use of introducers known in the art. A hemostasis introducer
sheath (not shown), for example, may be first positioned in the
left femoral artery, providing access for the implantation tools. A
second introducer sheath (not shown) may also be positioned in the
right femoral artery, providing access for the implantation tools.
It is to be understood that alternative access points may also be
used. Access at both the left femoral artery and the right femoral
artery, for example, allows for multiple implantation tools to be
positioned within the vasculature at the same time, allowing the
implantation procedure to be efficiently performed.
[0276] A. Position Main Body Prosthesis
[0277] A first step includes positioning the main body prosthesis
120 at the desired location. From either the left or right femoral
artery, under image guidance, the first guide wire 30 is advanced
into the ipsilateral iliac artery and to the descending aorta. The
deployment catheter 200 is then navigated over the first guide wire
30 to the desired location within the body, (e.g., aortic
aneurysm), for deployment of the main body prosthesis 120 (as FIG.
58 shows). A conventional hemostatic valve arrangement may be used
at the access site (shown for purposes of illustration in FIG.
44B).
[0278] B. Retract Outer Jacket
[0279] Next, the outer jacket 210 is retracted in a distal or
caudal direction to expose the main body prosthesis 120. By first
rotating the starting knob 302 on the handle assembly 212, the
outer jacket 210 is initially retracted from its secure position on
the catheter tip 222. After the mechanical advantage provided by
the rotation of the starting knob 302 has retracted the outer
jacket 210 away from the catheter tip 222, the jacket sliding knob
294 on the handle 212 may be used to further retract the jacket 210
and fully expose the main body prosthesis 120 (as FIGS. 59 and 60
show). The unrestrained portion or portions of the main body
prosthesis 120 self-expand, as can be seen in FIG. 60. Optionally,
the first lumen 126 may not be radially restrained, but still
restrained in relation to the central shaft 216 (see FIG. 32), so
as the outer jacket 210 is retracted, the first lumen 126 may self
expand as well, as can be seen in FIG. 61. As FIGS. 59 through 61
show, both during and after retraction of the outer jacket 210, the
main body prosthesis 120 maintains its position relative to the
central shaft 216 due to the proximal and distal retaining means
218, 220, coupled to the main body prosthesis 120.
[0280] It should be appreciated that the withdrawal of the outer
jacket 210 and the withdrawal of the proximal and distal releasing
means 228, 230, 232, or any combination thereof, can be
accomplished in a single step or process or in multiple steps. In
this arrangement, a single activation mechanism can be jointly
coupled to the outer jacket 210 and any or all of the releasing
means 228, 230, 232, so that the outer jacket 210 and releasing
means 228, 230, 232, are withdrawn in a single step, or multiple
steps.
[0281] C. Release First Proximal Retaining Means
[0282] In the third general step of the deployment process,
following the withdrawal of the outer jacket 210, the first
proximal sliding knob 322 on the handle assembly 212 is moved
distally, which causes the proximal end of the first proximal
releasing means 228, i.e., the first proximal release wire 250, to
be withdrawn from the first proximal retaining means 224, i.e., the
suture loop 252, and allows the restrained stent or stents 130, and
the proximal end 108 of the main body prosthesis 120 as a whole, to
self-expand radially to the first stage deployment configuration,
as seen in FIG. 62. The proximal end 108 of the main body
prosthesis 120 desirably radially expands either partially or fully
toward the internal walls of the vessel or hollow body organ.
[0283] At this point in the deployment process, both the proximal
and distal ends of the main body prosthesis 120 are being held and
controlled, respectively, by the second proximal retaining means
226 and the distal retaining means 232. This allows the
practitioner to adjust the position of the main body prosthesis 120
either longitudinally or rotationally before the next stage (fasten
proximal end), as well as hold and maintain control of the main
body prosthesis 120 during the next stage (fasten proximal means).
Further, because the main body prosthesis 120 can be selectively
retained and controlled from both proximal and distal ends during
deployment and anchoring, the prosthesis 120 itself need not be
self-supporting, but can instead be compliant in either or both
longitudinal and/or rotational dimensions, and thereby be capable
of conforming and accommodating anatomic changes that may occur
after implantation (e.g., shrinkage of the aneurysm).
[0284] D. Fasten Proximal End
[0285] The fourth general stage comprises fastening the proximal
end 108 of the main body prosthesis 120 to the internal walls of
the vessel or hollow body organ. From the right femoral artery,
under image guidance, a second guide wire 40 is advanced using a
conventional intravascular approach into the contralateral iliac
artery and to the descending aorta. However, other access sites and
methods can be utilized. The guide wire 40 desirably extends
through the second expanded lumen 128 and through the proximal
opening 122 of the main body prosthesis 120 (see FIG. 63). Next,
the steerable guide device 450, with the obturator 458 positioned
within the interior guide passage 456, is then navigated over the
second guide wire 40 to the desired location with respect to the
main body prosthesis 120 (see FIG. 64). Once the steerable guide
device 450 is in position, the obturator 458 and the second guide
wire 40 are both removed from the interior guide passage 456 and
from the body.
[0286] By rotating the steering assembly 460 (see FIG. 55), and
still employing fluoroscopy visualization, the clinician deflects
the proximal end region 464--and rotates the handle 454 to rotate
the flexible guide tube 452 if necessary--to orient the proximal
opening 468 of the passage 456 in a desired facing relationship
with the site where introduction of a fastener 402 is desired. An
operative tool, such as the fastener device 400 is then inserted
through the interior guide passage 456 of the steerable guide
device 450, and advanced until a fastener, such as the fastener
402, is located for deployment in relation to the now-oriented
proximal opening 468, as FIG. 65 shows. As the fastener device 400
is advanced out of the steerable guide device 450 and contacts the
wall of the main body prosthesis 120, a resultant force is applied
to the proximal end 464 of the steerable guide 450 which moves in
the opposite direction of the fastener device proximal end 410. The
resultant force causes the proximal end 464 of the steerable guide
450 to deflect until it contacts the opposite wall of the main body
prosthesis within the lumen or hollow body organ. In this way, the
force applied to the main body prosthesis 120 and vascular wall
from the proximal end 410 of the fastener device 400 is partially
resolved through the steerable guide 450 within the vessel or
hollow body organ. A representative embodiment of an endovascular
device that, in use, applies a helical fastener is described in
U.S. patent application Ser. No. 10/786,465, filed Feb. 25, 2004,
and entitled "Systems and Methods for Attaching a Prosthesis Within
a Body Lumen or Hollow Organ," which is incorporated herein by
reference.
[0287] The fastener device 400 can then be actuated to apply a
fastener 402 to the proximal end 108 of the main body prosthesis
120 and into the surrounding tissue (see FIG. 66). If the fastener
device 400 is a single fire device, i.e., it carries only one
fastener 402, the fastener device 400 is withdrawn through the
interior guide passage 456 and a new fastener 402 is mounted. See
FIGS. 85 and 86 for one embodiment of the fastener 430 being
mounted to the fastener device 400. The proximal end region 464 of
the steerable device 450 is reoriented in facing relationship with
a new fastening site. The fastener device 400 is inserted back
through the interior guide passage 456 to apply a second fastener
402 to the new fastening site (see FIG. 67). This sequence is
repeated until a desired number and array of fasteners 402 are
applied to the main body prosthesis 120, as can be seen in FIG.
68.
[0288] At this point, the fastener device 400 is withdrawn, leaving
the steerable guide device 450 in place. The obturator 458 is
repositioned within the interior guide passage 456, and the second
guide wire 40 is navigated through the obturator lumen 470 to the
desired location with respect to the main body prosthesis 120. Once
the second guide wire 40 is in position, the steerable guide device
450 and the obturator 458 are both removed from the interior guide
passage 456 and from the body leaving the second guide wire 40 in
position within the vasculature.
[0289] Throughout this stage of the deployment process, both the
proximal and distal ends of the main body prosthesis 120 can being
held and controlled, respectively, by the second proximal retaining
means 226 and the distal retaining means 232, while fastening
occurs.
[0290] E. Position First Lumen. Extension
[0291] In the fifth general stage of the deployment process,
following the fastening of the proximal end 108 of the main body
prosthesis 120, the extension deployment catheter 350 is used to
position a lumen extension 140 for deployment within a lumen of the
main body prosthesis 120. From the left or right femoral artery,
under image guidance, the extension catheter 350 is navigated over
the second guide wire 40 to the desired location, i.e.,
telescopically positioned partially within the second lumen 128 of
the main body prosthesis 120, as FIG. 69 shows. A conventional
hemostatic valve arrangement may be used at the access site (shown
for purposes of illustration in FIG. 44B).
[0292] F. Retract Extension Catheter Outer Jacket
[0293] Next, the extension catheter's outer jacket 360 must be
retracted in a distal or caudal direction to expose the lumen
extension 140. The jacket sliding knob 382 on the extension
catheter handle 362 is urged in a distal direction to retract the
jacket 360 and fully expose the lumen extension 140. The
unrestrained portion or portions of the lumen extension 140
self-expand (see FIG. 70). Both during and after retraction of the
outer jacket 360, the lumen extension 140 maintains its position
relative to the central shaft 356 due to the proximal retaining
means 366, coupled to the lumen extension 140.
[0294] G. Release Lumen Extension Proximal Retaining Means
[0295] In the seventh general step of the deployment process,
following the withdrawal of the extension catheter outer jacket
360, the proximal sliding knob 382 on the extension catheter handle
assembly 362 is moved distally, which causes the proximal end of
the proximal releasing means 370, i.e., the proximal release wire
380, to be withdrawn from the proximal retaining means 366, i.e.,
the suture loop 378, and allows the restrained stent or stents 150,
and the proximal end 142 of the lumen extension 140, to self-expand
radially to the deployment configuration, as seen in FIGS. 70 and
71. The proximal end 142 of the lumen extension 140 desirably
enlarges to contact the internal walls of the second lumen 128 of
the main body prosthesis 140. The natural flow of fluid through the
lumen extension 140 provides sufficient force to cause the
restraint mechanism of the lumen extension 140 to engage the
co-acting restraint mechanism of the main body prosthesis 120. The
lumen extension stent and/or outwardly extending apices 147 of the
lumen extension stent 150 engage the mating outwardly extending
apices 136 of the distal stent 134 positioned within the second
lumen 128 of the main body prosthesis 120 (as best seen in FIG.
10B) in order to couple the lumen extension 140 to the main body
prosthesis 120.
[0296] Prior to withdrawing the extension catheter 350, the outer
jacket 360 is desirably repositioned in an abutting relationship
with the catheter tip 368. The jacket sliding knob 382 on the
extension catheter handle 362 is urged in a proximal direction to
reposition the jacket 360 in a pre-deployment configuration. The
extension catheter 350 may now be withdrawn and removed from the
body. The second guide wire 40 may either be removed, or may remain
until the deployment process is completed.
[0297] H. Release Second Proximal Retaining Means
[0298] In the eighth general stage of the deployment process,
following the deployment of a first lumen extension 140, the second
proximal retaining means 226 is released. To release the proximal
end 108 of the main body prosthesis 120, the second proximal
release sliding knob 324 on the handle 212 is moved distally, which
causes the proximal end of the second proximal releasing means 230,
i.e., the second proximal release wire 268, to be withdrawn from
the prosthesis material 112 and the stabilizing arm apertures 264,
and allows the stabilizing arms 256 to release from the proximal
end 108 of the main body prosthesis 120, and spring proximally, as
shown in FIG. 72. The proximal end 108 of the main body prosthesis
120 is no longer in a restrained relationship with the central
shaft 216.
[0299] I. Release Distal Retaining Means
[0300] In the ninth general stage of the deployment process,
following the release of the second proximal retaining means 226,
the distal retaining means 220 is released. To release the distal
end 110 of the main body prosthesis 140, the distal release sliding
knob 326 on the handle 212 is moved distally, which causes the
proximal end of the distal releasing means 232, i.e., the distal
release wire 282, to be withdrawn from the distal retaining means
220, i.e., the distal suture loop 274, and allows the restrained
stent or stents 134 to self-expand radially to the second stage
deployment configuration, as seen in FIG. 73. As previously
mentioned, alternatively, the stent or stents 140 are not
necessarily radially restrained by the distal retaining means 226.
The main body prosthesis 120 is no longer in a restrained
relationship with the central shaft 216.
[0301] Prior to withdrawing the deployment catheter 200, the outer
jacket 210 is desirably repositioned in an abutting relationship
with the catheter tip 222. The jacket sliding knob 294 on the
catheter handle 212 is urged in a proximal direction to reposition
the jacket 210 in a pre-deployment configuration. The deployment
catheter 200 may now be withdrawn from the body, leaving the first
guide wire 30 within the vasculature (see FIG. 74).
[0302] J. Position Second Lumen Extension
[0303] In the tenth general stage of the deployment process,
following the release of the distal retaining means 220 and
withdrawal of the deployment catheter 200, the second lumen
extension 140 is positioned, for deployment. The general steps as
describe for the deployment of the first lumen extension 140 are
the same or similar, but will be repeated here for clarity. The
extension deployment catheter 350 is again used to position the
second lumen extension 140 for deployment within a lumen of the
main body prosthesis 120. From the left or right femoral artery,
for example, under image guidance, the extension catheter 350 is
navigated over the first guide wire 30 to the desired location,
i.e., telescopically positioned partially within the first lumen
126 of the main body prosthesis 120, as FIG. 75 shows. Again, as
previously described, a conventional hemostatic valve arrangement
may be used at the access site (shown for purposes of illustration
in FIG. 44B).
[0304] K. Retract Extension Catheter Outer Jacket
[0305] Next, the extension catheter's outer jacket 360 must be
retracted in a distal or caudal direction to expose the lumen
extension 140. The jacket sliding knob 382 on the extension
catheter handle 362 is urged, in a distal direction to retract the
jacket 360 and fully expose the lumen extension 140. The
unrestrained portion or portions of the lumen extension 140
self-expand (see FIGS. 75 and 76). As FIG. 76 shows, both during
and after retraction of the outer jacket 360, the lumen extension
140 maintains its position relative to the central shaft 356 due to
the proximal retaining means 366, coupled to the lumen extension
140.
[0306] L. Release. Lumen Extension Proximal Retaining Means
[0307] In the twelfth general step of the deployment process,
following the withdrawal of the extension catheter outer jacket
360, the proximal sliding knob 382 on the extension catheter handle
assembly 362 is moved distally, which causes the proximal end of
the proximal releasing means 370, i.e., the proximal release wire
380, to be withdrawn from the proximal retaining means 366, i.e.,
the suture loop 378, and allows the restrained stent or stents 150,
and the proximal end 142 of the lumen extension 140, to self-expand
radially to the deployment configuration, as seen in FIG. 77. The
proximal end 142 of the lumen extension 140 desirably enlarges to
contact the internal walls of the first lumen 126 of the main body
prosthesis 140. The natural flow of fluid through the lumen
extension 140 provides sufficient force to cause the restraint
mechanism of the lumen extension 140 to engage the co-acting
restraint mechanism of the main body prosthesis 120. The lumen
extension stent and/or the outwardly extending apices 147 of the
lumen extension stent 150 engage the mating outwardly extending
apices 136 of the distal stent 134 positioned within the first
lumen 126 of the main body prosthesis 120 (as best seen in FIG.
10B) in order to couple the rumen extension 140 to the main body
prosthesis 120.
[0308] Prior to withdrawing the extension catheter 350, the outer
jacket 360 is desirably repositioned in an abutting relationship
with the catheter tip 368. The jacket sliding knob 382 on the
extension catheter handle 362 is urged in a proximal direction to
reposition the jacket 360 in a pre-deployment configuration. The
extension catheter 350 may now be withdrawn and removed from the
body. Both the first guide wire 30 and the second guide wire 40 may
now be removed to complete the deployment process of the bifurcated
prosthesis 100, as can be seen in FIG. 78.
[0309] It is to be appreciated that the general steps just
described do not necessarily need to follow the order in which they
were described. For example, the second proximal retaining means
may be released prior to the deployment of the first lumen
extension 140, and the second guide wire may be removed prior to
the completion of the deployment process. It is also to be
appreciated that fasteners may be applied to the lumen extensions
as well to connect the lumen extensions to the iliac arteries.
[0310] It will also be appreciated that the components and/or
features of the preferred embodiments described herein may be used
together or separately, while the depicted methods and devices may
be combined or modified in whole or in part. It is contemplated
that the components of the guiding device, fastener device, and
helical fastener may be alternately oriented relative to each
other, for example, offset, bi-axial, etc. Further, it will be
understood that the various embodiments may be used in additional
procedures not described herein, such as vascular trauma, arterial
dissections, artificial heart valve attachment and attachment of
other prosthetic device within the vascular system and generally
within the body.
[0311] The foregoing is considered as illustrative only of the
principles of the invention. Furthermore, since numerous
modifications and changes will readily occur to those skilled in
the art, it is not desired to limit the invention to the exact
construction and operation shown and described. While the preferred
embodiment has been described, the details may be changed without
departing from the invention, which is defined by the claims.
[0312] The desired embodiments of the invention are described above
in detail for the purpose of setting forth a complete disclosure
and for the sake of explanation and clarity. Those skilled in the
art will envision other modifications within the scope and spirit
of the present disclosure.
* * * * *