U.S. patent application number 14/177803 was filed with the patent office on 2016-10-06 for devices, systems, and methods for atrial appendage occlusion.
This patent application is currently assigned to CVDevices, LLC. The applicant listed for this patent is CVDevices, LLC. Invention is credited to Ghassan S. Kassab, Jose A. Navia, SR..
Application Number | 20160287850 14/177803 |
Document ID | / |
Family ID | 51297973 |
Filed Date | 2016-10-06 |
United States Patent
Application |
20160287850 |
Kind Code |
A9 |
Kassab; Ghassan S. ; et
al. |
October 6, 2016 |
DEVICES, SYSTEMS, AND METHODS FOR ATRIAL APPENDAGE OCCLUSION
Abstract
Devices, systems and methods for atrial appendage occlusion. A
device is described with respect to non-surgically occluding the
left atrial appendage with minimal invasiveness. Additionally, a
system and method are described for using the device to perform the
left atrial appendage occlusion procedure.
Inventors: |
Kassab; Ghassan S.;
(Zionsville, IN) ; Navia, SR.; Jose A.; (Buenos
Aires, AR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
CVDevices, LLC |
Zionsville |
IN |
US |
|
|
Assignee: |
CVDevices, LLC
Zionsville
IN
|
Prior
Publication: |
|
Document Identifier |
Publication Date |
|
US 20140228877 A1 |
August 14, 2014 |
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|
Family ID: |
51297973 |
Appl. No.: |
14/177803 |
Filed: |
February 11, 2014 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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12522674 |
Apr 9, 2010 |
8647367 |
|
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PCT/US08/00838 |
Jan 23, 2008 |
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14177803 |
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60881831 |
Jan 23, 2007 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A61B 2017/00876
20130101; A61M 25/007 20130101; A61B 17/0057 20130101; A61B
2017/1205 20130101; A61B 17/122 20130101; A61B 17/00491 20130101;
A61B 17/12031 20130101; A61B 17/12122 20130101; A61B 17/12136
20130101; A61B 2017/00292 20130101; A61M 29/02 20130101; A61B
17/1204 20130101; A61B 2017/0065 20130101; A61B 2017/00867
20130101; A61B 2017/306 20130101; A61B 2017/00349 20130101 |
International
Class: |
A61M 29/02 20060101
A61M029/02 |
Claims
1. A method for occluding an atrial appendage comprising the steps
of: providing a device for occluding an atrial appendage
comprising: a shaft comprising a first hollow interior, an exterior
surface, a first open end, a second open end, and an inflatable
balloon coupled to the exterior surface, a catheter slidably
positioned within the first hollow interior of the shaft, the
catheter comprising a proximal end, a distal end, an exterior
surface, a second hollow interior, and at least one opening
communicating from the second hollow interior to the exterior
surface adjacent to the distal end, a vacuum source operatively
coupled with the second hollow interior of the catheter and capable
of providing suction through the at least one opening, and an
adhesive delivery device operatively coupled with the second hollow
interior of the catheter and capable of delivering an adhesive
through the at least one opening, wherein the inflatable balloon is
configured to seal an ostium of the atrial appendage when the
device is positioned within the atrial appendage and the balloon is
inflated, and operation of the vacuum source creates a vacuum
within the sealed atrial appendage, thereby causing the atrial
appendage to collapse, and wherein the vacuum source is capable of
providing suction through the second open end; delivering the shaft
and catheter to the atrial appendage through a percutaneous
intravenous route; and inflating the balloon at the ostium of the
atrial appendage such that the ostium is sealed.
2. The method of claim 1, further comprising the step of:
collapsing the walls of the atrial appendage through operation of
the vacuum source while the balloon is inflated to seal the ostium
of the atrial appendage.
3. The method of claim 2, further comprising the step of: injecting
an adhesive into the collapsed atrial appendage, thereby sealing
the collapsed atrial appendage.
4. The method of claim 1, wherein delivering the shaft and catheter
to the atrial appendage further comprises the step of performing
transseptal procedure.
5. The method of claim 2, wherein the step of collapsing the walls
of the atrial appendage through operation of the vacuum source
further comprises: advancing the distal end of the catheter into
the atrial appendage; and applying suction to the interior of the
atrial appendage through the at least one opening of the
catheter.
6. The method of claim 3, wherein the step of injecting an adhesive
into the collapsed atrial appendage further comprises: advancing
the distal end of the catheter into the atrial appendage; and
operating the adhesive delivery device such that an amount of
adhesive advances through the second hollow interior of the
catheter and through the at least one opening.
7. The method of claim 3, wherein the step of operating the
adhesive delivery source is performed to fill the collapsed atrial
appendage with the adhesive.
8. The method of claim 3, further comprising the steps of:
deflating the balloon; and withdrawing the shaft and catheter.
9. The method of claim 2, further comprising the step of:
puncturing the walls of the atrial appendage at a first location by
advancing the catheter through the second open end of the
shaft.
10. The method of claim 9, further comprising the step of:
puncturing the walls of the atrial appendage at a second location
by advancing the catheter through the second open end of the
shaft.
11. The method of claim 9, further comprising the steps of:
delivering a first adhesive to the exterior walls of the atrial
appendage; and delivering a second adhesive to the interior walls
of the atrial appendage.
12. The method of claim 11, wherein the first adhesive comprises a
magnetic adhesive having a first polarity, and the second adhesive
comprises a magnetic adhesive comprising a second polarity.
13. The method of claim 11, wherein the step of delivering a second
adhesive to the exterior walls of the atrial appendage further
comprises the steps of: providing a device comprising: a second
catheter slidably positioned within the first hollow interior of
the shaft, the catheter comprising a distal end, an interior, and
at least one opening disposed through the distal end, wherein the
adhesive delivery device is operatively coupled with the interior
of the second catheter and capable of delivering the second
adhesive through the at least one opening in the second catheter;
withdrawing the first catheter from the first hollow interior of
the shaft; injecting the second adhesive into the collapsed atrial
appendage; and sealing the collapsed atrial appendage.
14. A device for occluding an atrial appendage, comprising: a shaft
comprising a first hollow interior, an exterior surface, a first
open end, a second open end, and an inflatable balloon coupled to
the exterior surface; a catheter slidably positioned within the
first hollow interior of the shaft, the catheter comprising a
proximal end, a distal end, an exterior surface, a second hollow
interior, and at least one opening communicating from the second
hollow interior to the exterior surface adjacent to the distal end;
a vacuum source operatively coupled with the second hollow interior
of the catheter and capable of providing suction through the at
least one opening; and an adhesive delivery device operatively
coupled with the second hollow interior of the catheter and capable
of delivering an adhesive through the at least one opening; wherein
the inflatable balloon is configured to seal an ostium of the
atrial appendage when the device is positioned within the atrial
appendage and the balloon is inflated; wherein operation of the
vacuum source creates a vacuum within the sealed atrial appendage,
thereby causing the atrial appendage to collapse; wherein the
vacuum source is capable of providing suction through the second
open end; and wherein the adhesive delivery device is capable of
delivering an adhesive to the atrial appendage through the second
hollow interior of the catheter.
15. The device of claim 14, wherein the first lumen is disposed
around a circumference of the catheter.
16. The device of claim 14, wherein the first hollow interior of
the shaft extends from the proximal end of the shaft to the distal
end of the shaft and the second hollow interior of the catheter
extends from the proximal end of the catheter to the distal end of
the catheter.
17. A method for occluding an atrial appendage, comprising the
steps of: percutaneously and intravascularly introducing a portion
of a device for occluding an atrial appendage through a blood
vessel, into a heart, and into the atrial appendage, the device
comprising: a shaft defining a first hollow interior therethrough,
an exterior surface, a first open end, a second open end, and
having an inflatable balloon coupled thereto, the inflatable
balloon configured to seal an ostium of the atrial appendage upon
inflation; a catheter slidably positioned within the first hollow
interior of the shaft, the catheter comprising a proximal end, a
distal end, an exterior surface, and defining a second hollow
interior therethrough and at least one opening at or near a distal
end of the catheter in communication with the second hollow
interior; an adhesive delivery device coupled with the second
hollow interior of the catheter and configured to deliver an
adhesive through the at least one opening; and a vacuum source
operatively coupled with the second hollow interior of the catheter
and capable of providing suction through the at least one opening;
wherein the inflatable balloon is configured to seal an ostium of
the atrial appendage when the device is positioned within the
atrial appendage and the balloon is inflated, and operation of the
vacuum source creates a vacuum within the sealed atrial appendage,
thereby causing the atrial appendage to collapse; and wherein the
vacuum source is capable of providing suction through the second
open end; positioning the balloon at the ostium of the atrial
appendage; and inflating the balloon to seal the ostium.
18. The method of claim 17, further comprising the step of:
operating the vacuum source operatively coupled to the catheter to
collapse the atrial appendage while the balloon is inflated to seal
the ostium of the atrial appendage.
19. The method of claim 18, further comprising the step of:
injecting an adhesive into the collapsed atrial appendage to seal
the collapsed atrial appendage.
20. The method of claim 19, further comprising the step of:
removing the shaft and catheter from the sealed atrial appendage.
Description
PRIORITY
[0001] The present application is related to, claims the priority
benefit of, and is a U.S. continuation application of, U.S. patent
application Ser. No. 12/522,674, filed on Jul. 9, 2009 and issued
as U.S. Pat. No. 8,647,367 on Feb. 11, 2014, which is related to,
and claims the priority benefit of, International Patent
Application Serial No. PCT/US2008/000838, filed on Jan. 23, 2008,
which is related to, and claims the priority benefit of, U.S.
Provisional Patent Application Ser. No. 60/881,831, filed on Jan.
23, 2007. The contents of each of these applications and issued
patent are hereby incorporated by reference in their entirety into
this disclosure.
BACKGROUND
[0002] Currently, 2.2 million patients in the United States suffer
atrial fibrillation ("AF"). About half of these patients are
considered to be at a high risk for stroke. The Stroke Prevention
in Atrial Fibrillation trials (SPAF, SPAF II, SPAF III) have shown
that chronic warfarin therapy reduces the risk of stroke by about
70%. Nevertheless, problems related with the long term use of
anti-coagulation treatments are well known. It has been shown that
up to two-thirds of eligible AF patients do not receive warfarin
treatment. This can be at least partly attributed to the fact that
warfarin is difficult to dose as it is known to interact with many
commonly-used medications and other chemicals that may be present
in appreciable quantities in food. Accordingly, safer options are
desirable.
[0003] AF is frequently diagnosed in elderly patients and is
responsible for more than 15% of all strokes. This percentage grows
to almost 25% in women and men older than 80 years of age. Dilation
of the left atrium and a reduction of blood flow velocity,
especially in the left atrial appendage, is commonly seen with AF.
Atrial contraction is responsible for blood ejection out of the
left atrium and appendage. The dysfunction of the left atrial
contraction is followed by blood stagnation, especially at the
level of the atrial appendage. It has been demonstrated by means of
echocardiography and autopsy studies that more than 90% of all
thrombi in patients with non-rheumatic AF beginning in the left
atrium, appear in the left atrial appendage. Thrombus formation
elevates the threat of stroke by three-fold.
[0004] The left atrial appendage ("LAA") is an embryonic remnant of
the left atrium that grows during the third week of pregnancy. The
left atrial cavity develops soon after and is produced from an
outgrowth of the pulmonary veins. The diameter of the LAA ostium
into the left atrial cavity is about 1 to 4 cm and is positioned
between the left upper pulmonary vein and the left ventricle. The
left axis deviation orifice, width, and length are typically about
0.7 to 2 cm, 0.9 to 3.4 cm, and 1.3 to 4 cm, respectively. The
circumflex branch and the left coronary artery runs close to the
base of the LAA ostium.
[0005] The LAA is a long structure with tubular or hooked shape of
variable morphology and size. The LAA wall is trabeculated
including muscle bars, known as pectinate muscles. The cavities
between the pectinate muscles emerge as "branches" (lobes),
"twigs", or "fine structures." LAA closure may be an option in
patients who cannot receive anticoagulation treatment as a result
of contraindications or conditions in which the hemorrhage risk is
greater than the potential medical benefit.
[0006] One of the convention options of treating LAA closure is
surgery. However, it is unsuitable for the same high-risk patients
who are poor candidates for warfarin therapy. Accordingly, a safe,
accurate and minimally invasive procedure is needed to occlude the
LAA.
BRIEF SUMMARY
[0007] Embodiments disclosed herein comprise devices and methods of
LAA occlusion that do not require surgery and avoid many of the
risks associated with current methods of LAA occlusion. In one
embodiment, a standard trans-septal sheath kit is utilized for
percutaneous transluminal access. A balloon catheter at the tip of
the shaft is inflated for occlusion of the LAA orifice or ostium.
Thereafter, a three-lumen catheter with a pigtail tip designed for
dual functionality is utilized for suction first, which collapses
the LAA, then injection of magnetic glue to seal the collapsed
LAA.
[0008] In another exemplary embodiment of the present invention, a
plurality of wire needles are employed to puncture the LAA, and
thereafter apply magnetic beads thereon. In one embodiment,
biologic glue may also be employed to seal the LAA. In yet another
embodiment, an umbrella-like clip assembly composed of magnetic
rods is introduced through a catheter to the outside of the LAA.
The configuration of the magnetic rods may be opened to receive the
exterior portion of the LAA, and thereafter closed around the LAA
and secured to a magnetic substance inside the LAA. In one
embodiment, the magnetic rods employ magnetic forces to attract and
secure proper placement of the device
[0009] In still another exemplary embodiment, a pigtail catheter is
used to introduce a wire comprised of a shape memory alloy around
the base of the LAA. In one embodiment, a nitinol wire is used. In
application, the wire may be tied around the outside of the base of
the LAA, thereby maintaining the seal.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1A shows a side view of at least one embodiment of an
occlusion assembly;
[0011] FIG. 1B shows a cross-sectional view of at least one
embodiment of an occlusion assembly taken along line A-A of FIG.
1A;
[0012] FIGS. 2A-2E shows a side view of the occlusion assembly of
FIGS. 1A and 1B as applied to treat a left atrial appendage;
[0013] FIG. 3A shows a side view of at least one embodiment of an
occlusion assembly;
[0014] FIGS. 3B-D shows side views of the needle wires of the
occlusion assembly of FIG. 3A applied to treat a left atrial
appendage;
[0015] FIG. 3E shows a side view of at least one embodiment of an
occlusion assembly as applied to treat a left atrial appendage;
[0016] FIG. 3F shows a side view of a left atrial appendage that
has been occluded using the occlusion assembly of FIGS. 3A-E;
[0017] FIGS. 4A-4B show two side views of at least one embodiment
of an occlusion assembly as applied to treat a left atrial
appendage;
[0018] FIGS. 5A, 5B, and 5C show side views of the occlusion
assembly of FIGS. 4A-4B in operation;
[0019] FIGS. 6A-6C show various embodiments of a pigtail catheter
that may be used to treat a left atrial appendage; and
[0020] FIGS. 7-9B shows a side view of the pigtail catheter of
FIGS. 6A-6C as applied to treat a left atrial appendage.
DETAILED DESCRIPTION
[0021] Reference will now be made to the embodiments illustrated in
the drawings and specific language will be used to describe the
same. It will nevertheless be understood that no limitation of
scope is intended by the description of these embodiments.
[0022] FIG. 1 shows a side view of one embodiment of an occlusion
assembly 10 for closing a left atrial appendage. Specifically, the
assembly 10 is configured for placement within the left atrial
appendage ("LAA") and is delivered non-surgically through the use
of catheterization and percutaneous transluminal access.
[0023] The occlusion assembly 10 comprises a shaft 12, a balloon
14, a catheter 16, and a guidewire 18. The shaft 12 comprises an
elongated catheter shaft having a proximal end 20, a distal end 22,
and an interior 24. Both the proximal end 20 and the distal end 22
of the shaft 12 are open and in communication with the interior 24.
The interior 24 of the shaft 12 extends throughout the length of
the shaft 12 and provides a channel through which the distal end 22
of the shaft 12 may be accessed when positioned within a body.
[0024] The balloon 14 is coupled with the distal end 22 of the
shaft 12 and can comprise any balloon catheter tip known in the
art. The balloon 14 may comprise a tube or other inflation means
(not shown) coupled therewith to facilitate the inflation and
deflation of the balloon 14 when positioned within the body. The
balloon 14 can be configured in a range of sizes to accommodate the
anatomy of the left atrial appendage. In one embodiment, the
balloon 14 comprises a flattened-disk configuration, however it
will be understood that the balloon 14 can comprise various shapes
and forms that will assist in the temporary closing and sealing of
the LAA cavity, including, without limitation, a hemisphere shape
and a wine-bottle cork shape.
[0025] The occlusion assembly 10 further comprises a guidewire 18.
The guidewire 18 is configured to be inserted through the interior
24 of the shaft 12 and may be any standard guidewire known in the
art. In one embodiment, the guidewire 18 functions to facilitate
navigation of the shaft 12 and catheter 16 into the LAA. Use of the
guidewire 18 enables more effective navigation of the occlusion
assembly 10 and prevents damage to the atrial or appendage
walls.
[0026] In one approach, the procedure can be performed under local
anesthesia and conscious sedation. The shaft 12 and the balloon 14
coupled therewith are inserted through the femoral vein and
advanced to the right atrium of the heart. Thereafter, a
trans-septal puncture is made at the level of the fossa ovalis area
to access the left atrium. After the shaft 12 and the balloon 14
are positioned within the left atrium, the guidewire 18 is inserted
into the LAA, visualized by fluoroscopy or transesophageal
echocardiography, and the shaft 12 is threaded over the guidewire
18 such that the balloon 14 is positioned adjacent to the ostium of
the LAA. When the balloon 14 is properly positioned, as shown in
FIG. 1A, the balloon 14 is inflated to occlude the LAA orifice.
[0027] After the shaft 12 and the balloon 14 are properly
positioned with respect to the LAA, the catheter 16 may be
introduced. The catheter 16 of the occlusion assembly 10 comprises
an elongated, flexible tube having an exterior wall, a proximal end
30, a distal end 32, a hollow interior 34, and at least one opening
36 disposed through the exterior wall. The proximal end 30 of the
catheter 16 is in communication with the interior 34, and the
interior 34 extends throughout the length of the catheter 16.
Accordingly, the interior 34 of the catheter 16 provides a channel
through which the distal end 32 may be accessed.
[0028] The catheter 16 is configured to be slidably positioned
within the interior 24 of the shaft 12. For example, the distal end
32 of the catheter 16 can be inserted into the proximal end 20 of
the shaft 12, advanced through the interior 24 of the shaft 12, and
extended into the LAA cavity. In one embodiment, the catheter 16
comprises a length that is greater than the length of the shaft 12
such that the distal end 32 of the catheter 16 can conveniently be
extended through the distal end 22 of the shaft and into the LAA
cavity. Further, in at least one embodiment, the catheter 16
comprises a three-lumen pigtail catheter, such that the distal end
32 is tightly curled. This tightly curled configuration functions
to prevent trauma in the event the proximal end 32 comes into
contact with a vessel or organ wall as the catheter 16 is advanced
through the body of a patient.
[0029] The distal end 32 of the catheter 16 comprises at least one
opening 36 disposed therein. Each of openings 36 located on the
distal end 32 is in communication with the interior 34 of the
catheter 16 and comprises a configuration such that a force or
substance can be transmitted therethrough. For example, in one
embodiment, the at least one opening 36 comprises a suction port
configured to aspirate an area adjacent to the catheter 16 when the
at least one opening 36 is coupled with a vacuum source. In an
alternative embodiment, the at least one opening 36 comprises a
single opening at the distal end 32 of the catheter 16, configured
such that the guidewire 18 or other device can be positioned
therethrough. In yet another embodiment, the at least one opening
36 is configured to deliver a substance to the surrounding tissue,
such as an adhesive or medicament. The number of openings 36
located on the distal end 32 of the catheter 16 may depend on the
desired functionality of the occlusion assembly 10, and it will be
understood that any number of openings 36 may be employed.
[0030] As previously described, the interior 34 of the catheter 16
extends from the proximal end 30 of the catheter 16 to the distal
end 32 of the catheter 16. Further, the interior 34 is in
communication with the at least one opening 36. Accordingly, the
interior 34 of the catheter 16 can function as a conduit through
which a force, device, and/or substance may be delivered to the at
least one opening 36. For example, when a vacuum source, such as a
syringe or other vacuum source, is coupled with the proximal end 30
of the catheter 16, the suctional force produced thereby can be
communicated throughout the interior 34 of the catheter 16 and
through the at least one opening 36 in communication therewith. In
one embodiment, a syringe or other vacuum source (not shown) may be
coupled with the proximal end 30 of the catheter 16 in order to
provide appropriate suction throughout the interior 34 of the
catheter 16. It will be understood that any type of vacuum source
may be used to supply suction throughout the interior 34, such as a
controlled vacuum system providing specific suction pressures. In
another embodiment, an adhesive delivery device (not shown) is
coupled with the proximal end 30 of the catheter 16. The adhesive
delivery device may comprise any means for advancing an adhesive
through the interior 34 of the catheter and through the at least
one opening 36. For example, in one embodiment, the adhesive
delivery device may be a clinician's hand when he or she applies
force to a container of adhesive such that the adhesive is advanced
through the interior 34 of the catheter 16. In an alternative
embodiment, the adhesive delivery device may comprise a
specifically designed mechanism for advancing the adhesive.
[0031] Referring now to FIG. 1B, in one embodiment, the interior 34
of the catheter 16 comprises multiple lumens. In the embodiment
shown in FIG. 1B, the occlusion assembly 10 comprises a
triple-lumen pigtail catheter, wherein the interior 34 comprises a
first lumen 42, a second lumen 44, and a third lumen 46. In this
embodiment, the first lumen 42 is disposed around the circumference
of the catheter 16 and the second and third lumens 44, 46 are
disposed centrally within the interior 34. The second and third
lumens 44, 46 are wholly surrounded by the first lumen 42. While
this specific configuration is shown with respect to FIG. 1B, it
will be appreciated that the interior 34 may comprise any number of
lumens and the lumens can be arranged in any configuration.
[0032] The multiple lumens enable the catheter 16 to perform
multiple functions without withdrawing the catheter 16 from the
body or employing more than one device. For example, a plurality of
openings 36 configured to aspirate a tissue may be in communication
with the first lumen 42, a single opening 36 configured to receive
the guidewire 18 therethrough may be in communication with the
second lumen 44, and a plurality of openings 36 configured to
deliver a substance to a tissue may be in communication with the
third lumen 46. In this manner, the catheter 16 is capable of
various functionalities including, without limitation, delivering
suction to the cavity of the LAA, advancing the guidewire 18 to
ensure accurate navigation throughout the body, and applying an
adhesive to the LAA. It will be recognized that the catheter 16 may
further comprise any combination of the aforementioned embodiments
on a single device. In addition, the number of openings 36 located
on the distal end 32 of the catheter 16 depend on the desired
functionality of the occlusion assembly 10, and it will be
understood that any number of openings 36 may be employed.
[0033] The operation of the occlusion assembly 10 will now be
described with respect to the at least one embodiment of the
catheter 16 shown in FIG. 2A. While this embodiment is described
herein, it is understood that any of the embodiments of the
catheters 16 described herein may be used to occlude a LAA.
[0034] In operation, the guidewire 18 is threaded through the
previously deployed shaft 12 and inserted into the cavity of the
LAA, visualized by fluoroscopy or transesophageal echocardiography.
After the guidewire 18 has accessed the cavity of the LAA, the
distal end 32 of the catheter 16 is advanced through the distal end
22 of the shaft 12 and into the cavity of the LAA as shown in FIG.
2A. While maintaining the inflation of the balloon 14 occluding the
LAA ostium, suction is initiated through the catheter 16.
Specifically, a vacuum source is coupled with the first lumen 41
such that a vacuum is created therein. In this manner, the
plurality of openings 36 function to aspirate the cavity of the
LAA. This suctional force is maintained until a small amount of
blood is removed from the LAA cavity and the LAA wall collapses as
shown in FIG. 2B. After the LAA wall is completely collapsed, the
suction is ceased. As the balloon 14 is occluding the LAA ostium
and the LAA cavity is sealed, the collapse is maintained even in
the absence of aspiration.
[0035] At this point, the catheter 16 is used to inject an adhesive
47 into the collapsed LAA cavity. In one embodiment the adhesive 47
comprises a biologic glue, however, the adhesive 47 can comprise
any adhesive known in the medical arts. Accordingly, the occlusion
assembly 10 may further comprise a delivery apparatus (not shown)
for providing the adhesive 47 to the catheter 16. In one
embodiment, the delivery apparatus is coupled with the third lumen
46 such that the adhesive 47 is advanced therethrough and applied
to the cavity of the LAA through the at least one of opening 36 in
communication therewith.
[0036] As shown in FIG. 2C, the application of the adhesive 47
within the collapsed LAA functions to seal the LAA. Further, as the
catheter 16 delivers the adhesive 47 into the LAA cavity, the
catheter 16 is slowly withdrawn through the interior 24 of the
shaft 12 (FIG. 2D). After the adhesive 47 has completed sealing,
the balloon 14 is deflated. Thereafter, the left atrium of the
heart can be injected with dye in order to show angiographically
the LAA occlusion. Once the success of the procedure has been
confirmed, the shaft 12 and the balloon 14 are withdrawn from the
body, across the interatrial septum and back through the femoral
vein, thereby leaving the cavity of LAA sealed as shown in FIG.
2E.
[0037] Now referring to FIG. 3, an additional embodiment of an
occlusion assembly 100 is shown. The occlusion assembly 100
comprises the shaft 12 and the balloon 14, and a catheter needle
118. The shaft 12 and the balloon 14 are configured identically to
the shaft 12 and the balloon 14 of the occlusion assembly 10.
Accordingly, configuration of the shaft 12 and the balloon 14 will
not be described in detail with respect to the occlusion assembly
100, and like reference numerals between FIGS. 1A-2E and FIGS.
3A-3D will refer to like components.
[0038] The catheter needle 118 of the occlusion assembly 100
comprises a catheter 116 comprising a proximal end 130, a distal
end 132, a hollow interior 134, and one or more needle wires 121.
The catheter 116 may be composed of any material known in the
medical arts suitable for application within the heart. The hollow
interior 134 of the catheter 116 extends the length of the catheter
116, and in one embodiment, the interior 134 of the catheter 116
comprises at least two independent lumens.
[0039] The needle wires 121 are coupled with the distal end 132 of
the catheter 116 and extend therefrom. The needle wires 121 are
hollow so that a magnetic glue-like substance or other suitable
substance (not shown) can pass therethrough. In one embodiment,
each of the needle wires 121 comprise a lumen extending the length
of the needle wire 121 and a distal needle aperture 123 in
communication with the lumen. The needle wires 121 may be composed
of any suitable material commonly used in the medical arts that
serves the functions noted herein including, without limitation, a
metallic compound. In one embodiment, the needle wires 121 are
comprised of a very fine, hollow wire.
[0040] The catheter needle 118 can be slidably positioned within
the interior 24 of the shaft 12. When the needle wires 121 of the
catheter needle 118 are encased within the interior 24 of the shaft
12, the needle wires 121 are necessarily in a closed, joined form.
In this manner, a clinician can effectively manipulate the catheter
needle 118 containing the needle wires 121 in and around a
patient's body without the needle wires 121 protruding and
contacting surrounding tissue. However, once the catheter needle
118 is properly positioned (e.g., within the atrial appendage), a
clinician may advance the catheter needle 118 through the distal
end 22 of the shaft 12, thereby exposing the needle wires 121 and
allowing them to expand as shown in FIG. 3B.
[0041] The lumen of each of the needle wires 121 is in
communication with the hollow interior 134 of the catheter 116. In
the embodiment where the catheter 116 comprises at least two
independent lumens, the lumens of each of the needle wires 121 may
be in communication with one of the lumens of the catheter 116,
some of the lumens of the catheter 116, or all of the lumens of the
catheter 116. In one embodiment, the lumen of each needle wire 121
is in communication with each of the lumens of the catheter 116. In
this manner, a first lumen of the catheter 116 may provide a
suctional force through the lumen of the needle wire 121, and a
second lumen of the catheter 116 may provide delivery of an
adhesive or medicament through the lumen of the needle wire 121.
Alternatively, and in the same manner, a first lumen of the
catheter 116 may provide a first adhesive to the needle wire 121
and a second lumen of the catheter 116 may provide a second
adhesive to the needle wire 121.
[0042] As previously described, the needle wires 121 comprise a
distal aperture 123. The distal aperture 123 is in communication
with the lumen of the needle wire 118, and as such, in
communication with the interior 134 of the catheter 116. In this
manner a magnetic glue-like substance can be advanced through the
interior of the catheter 116, into the lumen of the needle wire
118, and delivered to a targeted tissue through the needle aperture
123. Alternatively, a suctional force can be transmitted through
the needle aperture 123. In one embodiment, the needle wires 121
are connected to an injection apparatus (not shown) for glue
delivery via the hollow interiors of the needle wires 121, and a
vacuum source (not shown) to supply the requisite suction necessary
to aspirate the LAA cavity.
[0043] The needle wires 121 may further have an expanded memory.
For example, the needle wires 121 may be initially closed and then
expanded once exposed to a particular temperature or other stimuli.
In other words, the needle wires 121 may comprise an original
configuration, which may include, without limitation, a bend and/or
a curve in the needle wires 121. When the needle wires 121
exhibiting their original configuration are positioned within the
shaft 12, the original configuration may be altered (e.g., the
needle wires 121 may be straightened while positioned within the
interior of the shaft 12). When the needle wires 121 are thereafter
protracted from the distal end 22 of the shaft 12, the original
configuration of the needle wires 121 may then present itself.
[0044] The occlusion assembly 100 may be used in conjunction with
an injection apparatus and a magnetic glue-like substance capable
of injection by the injection apparatus. The injection apparatus
may comprise any device capable of advancing a magnetic glue-like
substance into the needle wires 121. The magnetic glue-like
substance may exert a sufficient magnetic force so that when the
magnetic glue-like substance is positioned on the exterior wall of
an atrial appendage, the magnetic glue-like substance functions to
effectively collapse the structure of the atrial appendage. The
magnetic glue-like substance can be composed of any commonly used
adhesive substance known in the medical arts.
[0045] In operation, the occlusion assembly 100, the shaft 12 and
balloon 14 are delivered and deployed as previously described.
Specifically, the balloon 14 is inflated and positioned to collect
occluding the ostium of the LAA. Thereafter, the catheter needle
118 is delivered through the interior 24 of the shaft 12 (see FIG.
3A) and suction of the LAA cavity is initiated. In one embodiment,
the suction can be provided through the needle apertures 123 of the
needle wires 121. In an alternative embodiment, a vacuum source can
be applied directly to the proximal end 20 of the shaft 12. The
suctional force of the vacuum is maintained and/or increased until
an amount of blood is removed from the LAA cavity and the LAA wall
collapses. Even after the wall collapses, a degree of suction is
maintained through the catheter 116 or the shaft 12 in order to
ensure the balloon 14 maintains optimal position.
[0046] Under fluoroscopic and transesophageal echocardiography
control, the catheter needle 118 is advanced through the distal end
22 of the shaft 12 and the walls of the LAA are punctured with the
needle wires 121 (see FIG. 3D). The needle wires 121 are capable of
completely puncturing the LAA wall, such that the needle apertures
123 of the needle wires 121 are positioned within the pericardial
sac. Due to the relatively thin nature of the needle wires 121, the
puncture of the LAA wall has minimal effect on the pressure within
the LAA cavity. However, in one embodiment, the suctional pressure
may be slightly increased during this step to facilitate a constant
pressure within the LAA cavity.
[0047] While the needle apertures 123 are positioned within the
pericardial sac, an amount of magnetite microbeads 57 are delivered
through the needle apertures 123 of the needle wires 121 onto the
epicardial surface. In one embodiment, this delivery is achieved
through the use of the injection apparatus previously described.
The magnetite microbeads 57 may be delivered as an adhesive
solution, a powder, or as carbon dioxide spray. As shown in FIG.
3D, after the first application is complete, the needle wires 121
are used to puncture the LAA and deliver the microbeads 57 to the
epicardial surface in multiple locations. Once a sufficient amount
of magnetite microbeads 57 have been applied to the external
surface of the atrial appendage, the needle catheter 118 may be
withdrawn through the shaft 12 and removed from the body.
Alternatively, prior to being withdrawn, the needle catheter 118
may deposit an amount of magnetite microbeads 57 within the
interior of the LAA cavity such that the magnetite microbeads 57
are distributed between the LAA wall trabecules (pectinate
muscles). The catheter 16 (as shown in FIGS. 1A-1E) is thereafter
introduced into the LAA cavity and an adhesive biological glue is
injected therein to achieve an adequate seal of the LAA ostium (see
FIG. 3E).
[0048] The inflation of the balloon 14 is maintained during the
requisite sealing time and the catheter 16 is withdrawn from the
body through the shaft 12. The magnetic attraction between the
magnetic beads 57 on the epicardial surface of the LAA and the
magnetite beads 57 disposed within the interior of the LAA
functions to create a constricted and tightened LAA, thereby
promoting the occlusion of the LAA (see FIG. 3F).
[0049] Now referring to FIGS. 4A and 4B, another embodiment of an
occlusion assembly 200 is shown. The occlusion assembly 200
comprises the shaft 12 and the balloon 14, and a catheter 216. The
shaft 12 and the balloon 14 are configured identically to the shaft
12 and the balloon 14 of the occlusion assembly 10. Accordingly,
configuration of the shaft 12 and the balloon 14 will not be
described in detail with respect to the occlusion assembly 100, and
like reference numerals between FIGS. 1A-2E and FIGS. 4A-4B will
refer to like components.
[0050] In one embodiment, a catheter 216 is used in conjunction
with the shaft 12 and the balloon 14 to collapse an atrial
appendage. The catheter 216 comprises a proximal end 220, a distal
end 222, and a clip assembly 250 extending from the distal end 222
of the catheter 216. The clip assembly 250 comprises a magnetic bar
254 and a plurality of ferromagnetic clips 255 positioned in an
umbrella-like configuration. The magnetic bar 254 is removably
coupled with the distal end 222 of the catheter 216 such that once
the clip assembly 250 is anchored to a tissue, the catheter 216 can
be removed therefrom and withdrawn from the body. Further, in at
least one embodiment, the magnetic bar 254 initially comprises a
sheath disposed thereon to prevent any magnetic attraction between
the ferromagnetic clips 255 and the magnetic bar 254 prior to
deployment of the device.
[0051] Each of the ferromagnetic clips 255 comprising the clip
assembly 250 comprises a first end 230 and a second end 232. In
addition, each of the ferromagnetic clips 255 exhibits a magnetic
polarity. The second ends 232 of the ferromagnetic clips 255 are
hingedly coupled with the magnetic bar 254, such that a hinged apex
257 is formed. From this hinged apex 257, the clip assembly 250 is
capable of moving between a compressed position (closed umbrella)
and an expanded position (open umbrella).
[0052] The ferromagnetic clips 255 are specifically arranged around
the magnetic bar 257 such that ferromagnetic clips 255 a magnetic
force is generated between the components of the clip assembly 250.
However, for as long as the sheath is disposed on the magnetic bar
254, the various components of the clip assembly 250 may be easily
maneuvered.
[0053] When the clip assembly 250 is positioned in a compressed
position, each of the ferromagnetic clips 255 lay substantially
parallel with the catheter 116 (see FIG. 4A). In addition, the apex
257 of the assembly 150 comprises a needle-like surface that is
capable of puncturing a targeted tissue. When the ferromagnetic
clips 255 are positioned in the expanded position, the first ends
230 of the clips 255 extend radially from the magnetic bar 257 such
that the ferromagnetic clips 255 are positioned in the expanded
position (see FIG. 4B).
[0054] The umbrella-like configuration of the clip assembly 250
enables the clip assembly 250 to puncture a targeted tissue and
subsequently anchor thereto. For example, when the ferromagnetic
clips 255 are positioned in the compressed position, the apex 257
of the clip assembly 250 can be used to puncture the tissue of the
LAA. Thereafter, the ferromagnetic clips 255 in the compressed
position are advanced through the puncture hole and into the
pericardial space. Once the first ends 230 of the ferromagnetic
clips 255 clear the puncture hole in the tissue, the catheter 216
is withdrawn through a pull back technique. As the first ends 230
of the ferromagnetic clips 255 are not as tightly configured as are
the second ends 232 which form a needle-like tip, the first ends
230 cannot retract through the puncture hole in the tissue.
Accordingly, the first ends 230 of the ferromagnetic clips 255 to
expand radially away from the catheter 216 and into the expanded
position.
[0055] The magnetic bar 254 remains positioned within the interior
of the LAA. At this point, the sheath disposed on the magnetic bar
254 to prevent magnetic interaction between the magnetic bar 257
and the ferromagnetic clips 255 is removed. Once the sheath is
removed, the magnetic attraction between the components of the clip
assembly 250 causes the ferromagnetic clips 255 to move into the
compressed position, thereby applying pressure to the exterior of
the LAA as shown in FIGS. 5A-5C. In this manner, a sandwich effect
is created around the exterior of the LAA and the LAA cavity is
caused to collapse. Once the desired collapse has been achieved,
the catheter 216 may be uncoupled from the magnetic bar 257
(through unscrewing or some other means) and withdrawn from the
body.
[0056] Now referring to FIGS. 6A-9B, at least one embodiment of an
occlusion assembly 300 is shown. The occlusion assembly 300
comprises the shaft 12, the balloon 14, a catheter 316, a needle
wire 318, and a memory wire 320. The shaft 12 and the balloon 14
are configured identically to the shaft 12 and the balloon 14 of
the occlusion assembly 10. Accordingly, configuration of the shaft
12 and the balloon 14 will not be described in detail with respect
to the occlusion assembly 300, and like reference numerals between
FIGS. 1A-2E and FIGS. 6A-9B will refer to like components.
[0057] The occlusion assembly 300 comprises a catheter 316, a
needle wire 318, and a memory wire 320. The catheter 316 comprises
a preformed pigtail catheter having a plurality of lumens. FIGS.
6A-6C illustrate various configurations of the catheter 316,
although the catheter 316 may comprise any other configuration
capable of advancing the memory wire 320 through the base of the
LAA. In one embodiment, the catheter 316 comprises three lumens: a
first lumen coupled with a vacuum device, a second lumen for
receiving a guide wire, and a third lumen for receiving the memory
wire 320 and the needle wire 318. The memory wire 320 may be made
of a shape memory alloy, such as nitinol. Thus, the wire 320 is
relatively straight when deployed through the catheter 316.
However, after introduction into the body and placement around the
atrial appendage, by manipulating the wire to wrap around the
appendage, the wire forms the shape of a loop. In one embodiment,
the memory wire 320 is relatively short and is employed with a
separate wire guide to facilitate accurate placement.
[0058] The catheter 316 is delivered into the LAA and suction is
applied thereto as previously described herein. The needle wire 318
is advanced through the shaft 12, and is used to puncture the base
of the LAA, as shown in FIG. 7. After the LAA wall is punctured,
the atraumatic guide wire 18 is introduced into the puncture hole
and advanced through the LAA wall and into the pericardial space.
Once the puncture hole is maintained by the guide wire 18, the
needle wire 318 is withdrawn back into the LAA and thereafter
removed from the body.
[0059] The catheter 316 is then advanced, following the guide wire
18, through the puncture in the LAA wall. Further, the pigtail
configuration of the catheter 316 is utilized to wrap around the
base of the LAA, as shown in FIG. 8. At this point, the guide wire
18 is withdrawn and removed, and the wire guide is advanced in its
place. The wire guide functions to push and deliver the short
memory wire 320 to the base of the LAA. Accordingly, the wire guide
effects the placement of the memory wire 320 through pushing and
pulling the memory wire 320 around the base of the LAA as shown in
FIG. 9. In this manner, the two ends of the memory wire 320 are
crossed around the base of the LAA. Concurrent with the
manipulation of the memory wire 320, the catheter 316 is slowly
withdrawn from the LAA cavity through the shaft 12. Due to the
shape memory alloy properties of the memory wire 320 and its
placement around the base of the LAA, the memory wire 320
effectively occludes the LAA without the use of adhesives or
sutures.
[0060] While various embodiments of devices, systems, and methods
for occluding the LAA have been described in considerable detail
herein, the embodiments are merely offered by way of non-limiting
examples. Many variations and modifications of the embodiments
described herein will be apparent to one of ordinary skill in the
art in light of the disclosure. It will therefore be understood by
those skilled in the art that various changes and modifications may
be made, and equivalents may be substituted for elements thereof,
without departing from the scope of the disclosure. Indeed, this
disclosure is not intended to be exhaustive or to limiting. The
scope of the disclosure is to be defined by the appended claims,
and by their equivalents.
[0061] Further, in describing representative embodiments, the
disclosure may have presented a method and/or process as a
particular sequence of steps. However, to the extent that the
method or process does not rely on the particular order of steps
set forth herein, the method or process should not be limited to
the particular sequence of steps described. As one of ordinary
skill in the art would appreciate, other sequences of steps may be
possible. Therefore, the particular order of the steps disclosed
herein should not be construed as limitations on the claims. In
addition, the claims directed to a method and/or process should not
be limited to the performance of their steps in the order written,
and one skilled in the art can readily appreciate that the
sequences may be varied and still remain within the spirit and
scope of the present disclosure.
[0062] It is therefore intended that this description and the
appended claims will encompass, all modifications and changes
apparent to those of ordinary skill in the art based on this
disclosure.
* * * * *