Rolling membrane stent delivery device
First Claim
1. A device for deploying an expandable stent at a treatment site within a body;
- comprising;
a first catheter having a proximal end region and a distal end region;
a stent retaining member disposed at the distal end region of the first catheter and including an inner layer extending distally beyond the first catheter, said member being turned back upon itself to form an outer layer extending toward the first catheter, said inner layer adapted to retain an expandable stent in a reduced state along an axial length of the stent with the stent located distally of the first catheter; and
a moving means operable to displace the outer layer relative to the first catheter, thereby to displace the inner layer remove the member from its retaining relation to the stent, thus to release the stent for expansion at the treatment site;
wherein a distal end of the first catheter is positioned near a proximal end of the stent when the inner layer of the stent retaining member retains the stent, to abut the stent and thereby prevent any substantial proximal migration of the stent as the retaining member is removed.
3 Assignments
0 Petitions
Accused Products
Abstract
A device for deploying radially self-expanded stents and other radially expandable stents includes an inner catheter, an outer catheter surrounding the inner catheter, and a tubular stent retaining sheath formed of a rolling membrane. The sheath is doubled over upon itself to provide an inner sheath layer attached to the inner catheter, and an outer sheath layer attached to the outer catheter. The sheath layers extend along and surround a radially self-expanding stent, to maintain the stent distally of the inner catheter and in a radially compressed, axially elongated state. Distally of the stent, the inner and outer sheath layers converge and are narrowed in the distal direction to define a tapered distal tip. To release the stent, the outer catheter is moved proximally to roll the membrane away from its surrounding relation to the stent, whereupon the stent radially self-expands progressively, beginning at its distal end. When completely retracted after stent release, the sheath surrounds a distal region of the inner catheter, and can provide a protective layer between arterial tissue and a dilatation balloon supported along the distal region. As an alternative, a stent formed of a recovery metal can be plastically deformed into a reduced radius state for delivery, which facilitates use of a more flexible stent retaining sheath. A further alternative involves securing the sheath proximally of the dilatation balloon, so that sheath retraction leaves the dilatation balloon exposed, rather than covered by the sheath.
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Citations
54 Claims
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1. A device for deploying an expandable stent at a treatment site within a body;
- comprising;
a first catheter having a proximal end region and a distal end region; a stent retaining member disposed at the distal end region of the first catheter and including an inner layer extending distally beyond the first catheter, said member being turned back upon itself to form an outer layer extending toward the first catheter, said inner layer adapted to retain an expandable stent in a reduced state along an axial length of the stent with the stent located distally of the first catheter; and a moving means operable to displace the outer layer relative to the first catheter, thereby to displace the inner layer remove the member from its retaining relation to the stent, thus to release the stent for expansion at the treatment site; wherein a distal end of the first catheter is positioned near a proximal end of the stent when the inner layer of the stent retaining member retains the stent, to abut the stent and thereby prevent any substantial proximal migration of the stent as the retaining member is removed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- comprising;
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14. An apparatus including a radially expandable stent and a device for deploying the radially expandable stent at a treatment site within a body lumen;
- comprising;
a radially expandable stent; an elongate first catheter having a proximal end and a distal end; an elongate second catheter having a proximal end and a distal end, and a catheter lumen running along the second catheter and open to the distal end of the second catheter, wherein the first catheter is contained within the catheter lumen; and a tubular, pliable and flexible sheath, and means for connecting a first end of the sheath to the first catheter, and for connecting a second end of the sheath to a distal end of the second catheter; wherein the first catheter and the second catheter are movable relative to one another to position the sheath in a stent retaining state in which the sheath surrounds the radially expandable stent along an axial length of the stent, the entire stent is disposed distally of the distal end of the first catheter, and the stent is in a radially reduced state to facilitate use of the first and second catheters to deliver the stent to a treatment site within a body lumen; and wherein the first catheter and the second catheter are further moveable relative to one another to roll the sheath proximally from its surrounding relation to the stent, thus to release the stent for radial expansion at the treatment site. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
- comprising;
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23. An apparatus for deploying a radially expandable stent at a treatment site within a body lumen and for forcing the stent against the body lumen after deployment;
- said apparatus comprising;
an elongate balloon catheter having a proximal end and a distal end; a stent releasing means disposed along the balloon catheter and having a proximal end; a sheath, and means for connecting a first end of the sheath to the balloon catheter and connecting a second end of the sheath to the stent releasing means; and a flexible dilatation balloon mounted to the balloon catheter near said distal end of the balloon catheter, and a balloon inflation lumen along the balloon catheter for supplying a fluid under pressure to the dilatation balloon; wherein the sheath is positionable in a stent retaining state with the sheath surrounding and engaging a radially expandable stent along an axial length of the stent when at least a portion of the stent extends distally of said balloon catheter, thus to maintain the stent in a radially reduced state to facilitate use of the balloon catheter to deliver the stent to a treatment site within a body lumen; wherein the stent releasing means is movable proximally relative to the balloon catheter to roll the sheath away from its surrounding relation to the stent, thus to release the stent for radial expansion at the treatment site; and wherein the first end of the sheath is connected to the balloon catheter at a location distally of the dilatation balloon. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31)
- said apparatus comprising;
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32. A device for releasably securing a radially expandable stent near a distal end of an elongate catheter, said device comprising:
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a stent retaining sheath mounted to a distal end region of a catheter, said sheath being positionable in a stent retaining state in which the sheath surrounds and engages a radially expandable stent along an axial length of the stent, thus to maintain the stent in a radially reduced state with the stent located distally of the catheter, to facilitate use of the catheter for delivery of the stent to a treatment site within a body lumen; wherein the sheath is movable proximally relative to the catheter to allow a rolling of the sheath away from its surrounding relation to the stent, to release the stent for radial expansion at the treatment site; wherein said distal end region is disposed near a proximal end of the stent when the sheath maintains the stent, to abut the stent and thereby prevent any substantial proximal migration of the stent as the sheath is rolled away to release the stent. - View Dependent Claims (33, 34, 35, 36, 37, 38)
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39. A device for deploying a radially expandable stent at a treatment site within a body lumen, comprising:
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an elongate delivery catheter having a proximal end region and a distal end region; a tubular stent retaining sheath mounted to a distal end region of the delivery catheter and extended distally from the delivery catheter whereby the sheath is adapted to surround a radially expandable stent along an axial length of the stent, to maintain the stent in a radially reduced state to facilitate use of the delivery catheter to deliver the stent to a treatment site within a body lumen, said sheath, distally of the stent, converging in the distal direction to form a tapered distal tip; and a stent releasing means operatively coupled to the sheath and movable relative to the delivery catheter to roll the sheath away from its surrounding relation to the stent, to release the stent for radial expansion at the treatment site; wherein said sheath, when so maintaining the stent, includes an inner sheath layer extended distally from the delivery catheter and engaging the stent, and further is turned back upon itself at said distal tip to provide an outer sheath layer extended proximally toward the delivery catheter and surrounding the inner sheath layer; and wherein said inner sheath layer and said outer sheath layer, in the region of the distal tip, provide a transition region over which the hardness of the sheath diminishes in the distal direction, whereby said distal tip is softer than the remainder of the sheath. - View Dependent Claims (40, 41, 42)
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43. A device for deploying an expandable stent at a treatment site within a body, comprising:
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a first catheter having a proximal end region and a distal end region; a dilatation means mounted to the first catheter along the distal end region of the first catheter; a stent retaining member disposed at the distal end region of the first catheter and including an inner layer extending distally beyond the first catheter, said member being turned back upon itself to form an outer layer toward the first catheter, said inner layer adapted to retain an expandable stent in a reduced state along an axial length of the stent with the stent located distally of the first catheter, wherein the stent retaining member is mounted to the first catheter at a location distally of the dilatation means; and a moving means operable to displace the outer catheter relative to the first catheter, thereby to displace the inner layer to remove the member from its retaining relation to the stent, thus to release the stent for expansion at the treatment site. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52)
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53. A device for deploying an expandable stent at the treatment site within a body;
- comprising;
a first catheter having a proximal end and a distal end; a stent retaining member mounted to the first catheter and extending distally beyond said distal end of the first catheter to provide an inner layer, said stent retaining member further being turned back upon itself to form an outer layer adjacent and outside of the inner layer and extending proximally toward the first catheter, said inner layer adapted to retain an expandable stent in a reduced radius state along an axial length of the stent with the entire stent disposed distally of said distal end of the first catheter; and a moving means disposed outside of the first catheter and coupled to the outer layer of the stent retaining member, said moving means being operable to displace the outer layer relative to the first catheter, thereby to displace the inner layer to remove the inner layer from its retaining relation to the stent, thus to release the stent for expansion at the treatment site. - View Dependent Claims (54)
- comprising;
Specification