U.S. patent application number 11/534550 was filed with the patent office on 2007-01-18 for hydraulic controlled retractable tip filter retrieval catheter.
This patent application is currently assigned to SCIMED LIFE SYSTEMS, INC.. Invention is credited to Thomas E. Broome, Charles L. Euteneuer.
Application Number | 20070016247 11/534550 |
Document ID | / |
Family ID | 21785030 |
Filed Date | 2007-01-18 |
United States Patent
Application |
20070016247 |
Kind Code |
A1 |
Euteneuer; Charles L. ; et
al. |
January 18, 2007 |
HYDRAULIC CONTROLLED RETRACTABLE TIP FILTER RETRIEVAL CATHETER
Abstract
Distal protection filter retrieval devices and methods of
retrieving a distal protection filter. A filter retrieval catheter
may comprise an inner tube, an outer tube disposed over the inner
tube, an annular lumen disposed between the inner tube and the
outer tube, and a tapered member coupled to the lumen. The tapered
member may be movable between a first position for passing a lesion
and a second position retrieving a filter.
Inventors: |
Euteneuer; Charles L.; (St.
Michael, MN) ; Broome; Thomas E.; (Hopkins,
MN) |
Correspondence
Address: |
CROMPTON, SEAGER & TUFTE, LLC
1221 NICOLLET AVENUE
SUITE 800
MINNEAPOLIS
MN
55403-2420
US
|
Assignee: |
SCIMED LIFE SYSTEMS, INC.
One Scimed Place
Maple Grove
MN
|
Family ID: |
21785030 |
Appl. No.: |
11/534550 |
Filed: |
September 22, 2006 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
10017877 |
Dec 13, 2001 |
|
|
|
11534550 |
Sep 22, 2006 |
|
|
|
Current U.S.
Class: |
606/200 |
Current CPC
Class: |
A61F 2230/0067 20130101;
A61F 2/011 20200501; A61F 2002/018 20130101; A61F 2230/005
20130101 |
Class at
Publication: |
606/200 |
International
Class: |
A61M 29/00 20060101
A61M029/00 |
Claims
1. A filter retrieval catheter, comprising: an inner tube having a
proximal end, a distal end, and an inner lumen extending
therethrough; an outer tube disposed over the inner tube, the outer
tube including a proximal end and a distal end, wherein an annular
lumen is defined between the inner tube and the outer tube; and a
tip member slidably disposed in the annular lumen for movement
between a first position and a second position under the influence
of fluid pressure.
2. The filter retrieval catheter in accordance with claim 1,
wherein a quantity of fluid is disposed within the annular
lumen.
3. The filter retrieval catheter in accordance with claim 1,
wherein, in the first position at least a portion of the tip member
extends distal of the distal end of the outer tube.
4. The filter retrieval catheter in accordance with claim 1,
wherein, in the second position the tip member is disposed proximal
to the distal end of the outer tube.
5. The filter retrieval catheter in accordance with claim 1,
further comprising a shaft disposed within the inner lumen.
6. The filter retrieval catheter in accordance with claim 5,
wherein the shaft includes a filter coupled to the shaft.
7. A method of retrieving a filter from a blood vessel, comprising
the steps of: providing a catheter having a distal tip movable
between first and second positions under the influence of fluid
pressure; advancing the catheter to the filter; altering the fluid
pressure to allow the tip to move between the first and the second
position; enclosing the filter at least in part within the
catheter; and removing the catheter and filter proximally from the
blood vessel.
8. The method in accordance with claim 7, wherein the step of
altering the fluid pressure includes decreasing the fluid pressure,
and wherein decreasing the fluid pressure shifts the tip from the
first position to the second position.
9. The method in accordance with claim 7, wherein the step of
altering the fluid pressure includes increasing the fluid pressure,
and wherein increasing the fluid pressure shifts the tip from the
first position to the second position.
Description
[0001] This application is a continuation of U.S. application Ser.
No. 10/017,877 filed Dec. 13, 2001.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention pertains to catheters for retrieving a
distal protection filter. More precisely, the present invention
pertains to retrieval catheters having a tapered distal tip.
[0004] 2. Description of the Related Art
[0005] Heart disease is a major problem in the United States and
throughout the world. Conditions such as atherosclerosis result in
blood vessels becoming blocked or narrowed. This blockage can
result in lack of oxygenation of the heart, which has significant
consequences since the heart muscle must be well oxygenated in
order to maintain its blood pumping action.
[0006] Occluded, stenotic, or narrowed blood vessels may be treated
with a number of relatively non-invasive medical procedures
including percutaneous transluminal angioplasty (PTA), percutaneous
transluminal coronary angioplasty (PTCA), and atherectomy.
Angioplasty techniques typically involve the use of a balloon
catheter. The balloon catheter is advanced over a guidewire such
that the balloon is positioned adjacent a stenotic lesion. The
balloon is then inflated and the restriction of the vessel is
opened. During an atherectomy procedure, the stenotic lesion may be
mechanically cut away from the blood vessel wall using an
atherectomy catheter.
[0007] During angioplasty and atherectomy procedures, embolic
debris can be separated from the wall of the blood vessel. If this
debris enters the circulatory system, it could block other vascular
regions including the neural and pulmonary vasculature, both of
which are highly undesirable. During angioplasty procedures,
stenotic debris may also break loose due to manipulation of the
blood vessel. Because of this debris, a number of devices, termed
distal protection devices, have been developed to filter out this
debris.
BRIEF SUMMARY OF THE INVENTION
[0008] The present invention pertains to distal protection filter
retrieval catheters. The retrieval catheter may include an inner
tube, an outer tube disposed over the inner tube, a lumen disposed
between the inner tube and the outer tube, and a tapered member
coupled to the lumen. The tapered member may include, for example,
a distal tip or a rolling membrane movable between a first position
and a second position.
[0009] The first position may comprise the most appropriate
position for advancing the catheter across, for example, a stent or
lesion. The second position may comprise the most appropriate
position for retrieving a distal protection filter. Shifting the
tapered member between the first position and the second position
may occur by, for example, altering fluid pressure, venting fluid,
or infusing fluid into the lumen.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0010] FIG. 1 is a cross-section of a distal protection filter
retrieval catheter disposed within a blood vessel including a
tapered member in a first position;
[0011] FIG. 2 is a cross-section of the distal protection filter
retrieval catheter of FIG. 1 having the tapered member in a second
position;
[0012] FIG. 3 is a cross-section of an alternate distal protection
filter retrieval catheter disposed having a tapered member in a
first position; and
[0013] FIG. 4 is a cross-section of the distal protection filter
retrieval catheter of FIG. 3 having a tapered member in a second
position.
DETAILED DESCRIPTION OF THE INVENTION
[0014] The following description should be read with reference to
the drawings wherein like reference numerals indicate like elements
throughout the several views. The detailed description and drawings
illustrate example embodiments of the claimed invention.
[0015] FIG. 1 is a cross-section of a distal protection filter
retrieval catheter 10 disposed within a blood vessel 12 and
including a tapered member 14 configured in a first position.
Removing a distal protection filter 16 from blood vessel 12
following an intravascular procedure may be complicated by a number
of factors. For example, if the intravascular procedure includes
the placement of a stent 18 adjacent a lesion 20, a retrieval
catheter may catch or otherwise engage stent 18, which could lead
to the displacement of stent 18. To minimize the chance of
disrupting stent 18 or any other interventions that may be present
adjacent lesion 20, distal protection filter retrieval catheter 10
has been designed to include a tapered member 14 that may assist
passing catheter 10 past lesion 20 while causing minimal disruption
of stent 18.
[0016] Catheter 10 includes an outer tube 22 disposed over an inner
tube 24 and including an annular lumen 26 disposed therebetween.
Outer tube 22 includes a proximal end 28 and a distal end 30. Outer
tube 22 may be comprised of a polymer, stainless steel or
nickel-titanium alloy hypodermic tubing, or a composite thereof.
Alternatively, outer tube 22 may be generally comprised of metals,
polymers, or composites thereof.
[0017] Inner tube 24 includes a proximal end 32, a distal end 34,
and an inner lumen 36 extending therethrough. Similar to what is
stated above for outer tube 22, inner tube 24 may be comprised of
metals, polymers, or composites thereof. Inner lumen 36 may
comprise a guidewire lumen adapted and configured to have a
guidewire, core wire, etc. disposed therein.
[0018] Tapered member 14 may include a proximal end 42 and a
tapered distal tip 44. Tapered member 14 may be coupled to lumen
26. For example, tapered member may comprise a polymeric, metallic,
or composite tubular member slidably disposed within lumen 26. In
addition, the position of tapered member may be maintained or
otherwise altered by altering the pressure and/or the amount of
fluid within lumen 26.
[0019] Tapered member 14 is movable between a first position and a
second position. According to this embodiment, the first position
is understood to be tapered member 14 configured such that at least
a portion of distal tip 44 thereof extends beyond distal end 30 of
outer tube 22. The first position may be the most appropriate
position for tapered member 14 when advancing catheter 10 across
stent 18 or lesion 20 toward filter 16.
[0020] Distal protection filter 16 may be coupled to a generally
metallic elongate shaft 38, for example proximate a distal end 40
thereof. When using catheter 10 to retrieve filter 16 from blood
vessel 12, catheter 10 may pass over shaft 38 to a location
proximate filter 16. According to this embodiment, at least a
portion shaft 38 may extend through inner lumen 36.
[0021] Filter 16 and shaft 38 may generally comprise a number of
configurations known to those skilled in the appropriate art.
Filter 16 may be comprised of a polyurethane sheet and include at
least one opening that may be, for example, formed by known laser
techniques. The holes or openings are sized to allow blood flow
therethrough but restrict flow of debris or emboli floating in the
body lumen or cavity.
[0022] Filter 16 may be generally cone-shaped, and have a proximal
and a distal end. The distal end may be a narrow, "V"-shaped end
and can be fixedly secured or formed to shaft 38. The proximal end
has a relatively wide opening. Alternatively, filter 16 may be
cylindrical with a relatively rounded distal end.
[0023] Filter 16 operates between a closed collapsed profile and an
open radially-expanded deployed profile for collecting debris in a
body lumen. Filter 16 may include a collapsible proximally-tapered
frame having a mouth and a plurality of longitudinally-extending
ribs. In an expanded profile, the mouth is opened and the ribs
extend radially outwardly to support the mouth. In an alternate
embodiment, filter 16 may comprise a number of differing objects
including, but not limited to, a filter, a basket, a filter basket,
a sheath, a capture sheath, a capturing device, one or more struts,
one or more ribs, a mesh, a net, an expandable object, a
self-expanding object, and combinations thereof. A number of
differing configurations of filter 16 may be substituted without
departing from the spirit of the invention.
[0024] FIG. 2 is a cross-section of distal protection filter
retrieval catheter 10 having tapered member 14 in a second
position. The second position is understood to be tapered member 14
configured so that distal tip 44 may be disposed proximal to distal
end 30 of outer tube 22. The second position may be the most
appropriate position for retrieving filter 16. Accordingly, when
tapered member 14 is in the second position, the inside diameter of
tapered member may be sufficiently sized to accommodate filter 16
and allow removal thereof from blood vessel 12.
[0025] Inner tube 24 and outer tube 22 may be configured such that
distal end 30 of outer tube 22 extends distally beyond distal end
34 of inner tube 24. The length that outer tube 22 extending
distally of inner tube may be sized appropriated for having filter
16 disposed therein. Shifting tapered member 14 from the first
position to the second position would shift the inside diameter of
catheter 10 from that of tapered member 14 or inner tube 24 to that
of the inside diameter of outer tube 22. Increasing the inside
diameter of catheter 10 makes it possible for filter 16 to be
disposed therein, either collapsed or partially collapsed.
[0026] To shift tapered member 14 between the first and the second
positions, a clinician alters the fluid pressure or vent fluid from
lumen 26. For example, a quantity of fluid may be disposed within
lumen 26 that exerts a force upon tapered member 14 so as to hold
it in the first position. With tapered member 14 in the first
position, catheter 10 may be advanced across stent 18 or lesion 20.
Once catheter is positioned across stent 18, the fluid can be
vented from lumen 26. Venting fluid from lumen 26 will essentially
remove the force exerted by the fluid on tapered member 14 and
allow it to shift to the second position. The actual shift may
occur by a number of mechanisms. For example, once catheter 10
encounters filter 16, proximal movement of filter 16 into catheter
10 may exert a force on tapered member 14 in the proximal direction
and, thus, shift it into the second position.
[0027] Alternatively, tapered member 14 may be biased to be in the
second position (e.g., by a spring, etc.). According to this
embodiment, force exerted upon tapered member 14 by the fluid may
be acting to overcome the bias and hold tapered member 14 in the
first position. Venting the fluid would allow the bias in position
of tapered member 14 to shift tapered member 14 to the second
position.
[0028] FIG. 3 is a cross-section of an alternate distal protection
filter retrieval catheter 110 having a tapered member 114 in a
first position. Catheter 110 is essentially the same in form and
function as catheter 10 except that tapered member 114 comprises a
rolling membrane and that inner tube 124 and outer tube 122 are
configured such that distal end 134 of inner tube 124 extends
distally beyond distal end 130 of outer tube 122.
[0029] Tapered member 114 may be comprised of a polymer or
combination of polymers extending between distal end 130 of outer
tube 122 and distal end 134 of inner tube 124 and be generally
tapered and having a relatively low profile. Tapered member 114 is
in fluid communication with lumen 126. Similar to what is described
above, lumen 126 may include a fluid or other means for exerting
force onto tapered member 114. In alternate embodiments, tapered
member 114 may be relatively inelastic or be elastic.
[0030] Similar to what is described above, tapered member 114 may
be shifted between the first and the second positions by, for
example, altering the fluid pressure, infusing fluid, or venting
fluid from lumen 126. The first position of tapered member 114 is
understood to be where at least a portion of tapered member 114 is
disposed proximal to distal end 134 of inner tube 124. With tapered
member 114 in the first position, catheter 110 may be advanced
across stent 18 or lesion 20. Once catheter 110 is positioned
across stent 18, the fluid can be infused into lumen 126. Infusing
fluid into lumen 126 will exert a force on tapered member 114 and
cause it to move or roll distally, and shift it to the second
position.
[0031] FIG. 4 is a cross-section of distal protection filter
retrieval catheter 110 having tapered member 114 in a second
position. The second position is understood to be a configuration
of tapered member 114 wherein at least a portion thereof extends
distally of distal end 134 of inner tube 124. When tapered member
114 shifts from the first position to the second position, outer
tube 122 may move distally relative to inner tube 124. This
movement may be due to force exerted by the fluid onto tapered
member 114 being transferred to outer tube 122. Alternatively, the
position of outer tube 122 may be fixed relative to inner tube
124.
[0032] It can be appreciated that the first position of tapered
member 114 would be the appropriate position for advancing tapered
member 114 past lesion 20 or stent 18, and the second position is
the position that would be appropriate for retrieving filter 16.
According to this embodiment, the second position would configure
catheter 110 with an inside diameter (e.g., the inside diameter
defined by tapered member 114 or outer tube 122) that is sized for
having filter 16 disposed therein.
[0033] It should be understood that this disclosure is, in many
respects, only illustrative. Changes may be made in details,
particularly in matters of shape, size, and arrangement of steps
without exceeding the scope of the invention. The invention's scope
is, of course, defined in the language in which the appended claims
are expressed.
* * * * *