Self-expanding stent and stent delivery system for treatment of vascular stenosis
First Claim
1. A self-expanding stent and stent delivery system comprising:
- a balloon catheter comprised of an elongated catheter having a delivery lumen and an inflation lumen, said elongated catheter having a distal section and an inflatable balloon mounted on the distal section of said elongated catheter and communicating with the inflation lumen;
an elongated core member slidably disposed within the delivery lumen of said elongated catheter, said elongated core member including a proximal cylindrical member disposed about said elongated core member, and a distal cylindrical member disposed about said elongated core member and positioned distally of said proximal cylindrical member and being spaced apart from said proximal cylindrical member to define a gap having a predetermined length; and
, a self-expanding stent comprised of a small diameter skeletal tubular member having a thin wall, said wall of said skeletal tubular member including a plurality of cells which are formed by a plurality of interconnected strut members, and a cylindrical anchor member placed on one of said plurality of strut members, said cylindrical anchor member having a length less than the length of the gap between the proximal cylindrical member and the distal cylindrical member, and said self-expanding stent being mounted on one of said cylindrical members such that said cylindrical anchor member is interlocked within said gap and between said proximal cylindrical member and said distal cylindrical member to thereby retain said stent on said elongated core member.
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Accused Products
Abstract
A self-expanding stent and stent delivery system are provided for treating vascular diseases such as partially occluded blood vessels within the brain. The self-expanding stent is preferably mounted on an elongated core wire including proximal, intermediate and distal cylindrical members disposed about the core wire. The proximal, intermediate, and distal cylindrical members are spaced apart such that first and second gaps are formed. The stent, which includes anchor members, is mounted on the intermediate cylindrical member such that the anchor members interlock within the gaps between the cylindrical members. The self-expanding stent and elongated core wire are disposed within a delivery lumen of a balloon catheter such that the balloon catheter compresses and constrains the stent about the intermediate cylindrical member to thereby interlock the stent onto the core wire. The elongated core wire further includes an expandable capture basket attached to the distal end of the elongated core wire in order to capture embolic debris released during angioplasty and during the deployment of the self-expanding stent.
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Citations
12 Claims
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1. A self-expanding stent and stent delivery system comprising:
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a balloon catheter comprised of an elongated catheter having a delivery lumen and an inflation lumen, said elongated catheter having a distal section and an inflatable balloon mounted on the distal section of said elongated catheter and communicating with the inflation lumen;
an elongated core member slidably disposed within the delivery lumen of said elongated catheter, said elongated core member including a proximal cylindrical member disposed about said elongated core member, and a distal cylindrical member disposed about said elongated core member and positioned distally of said proximal cylindrical member and being spaced apart from said proximal cylindrical member to define a gap having a predetermined length; and
,a self-expanding stent comprised of a small diameter skeletal tubular member having a thin wall, said wall of said skeletal tubular member including a plurality of cells which are formed by a plurality of interconnected strut members, and a cylindrical anchor member placed on one of said plurality of strut members, said cylindrical anchor member having a length less than the length of the gap between the proximal cylindrical member and the distal cylindrical member, and said self-expanding stent being mounted on one of said cylindrical members such that said cylindrical anchor member is interlocked within said gap and between said proximal cylindrical member and said distal cylindrical member to thereby retain said stent on said elongated core member. - View Dependent Claims (2, 3, 4)
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5. A self-expanding stent and stent delivery system comprising:
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a balloon catheter comprised of an elongated catheter having a delivery lumen, said elongated catheter having a distal section and an expandable balloon mounted on the distal section of said elongated catheter;
an elongated core member slidably disposed within the delivery lumen of said elongated catheter and having a stop member extending radially outward from said elongated core member; and
,a self-expanding stent mounted on said elongated core member and engaging said stop member so that said self-expanding stent can be moved through said delivery lumen when said elongated core member is moved through said delivery lumen. - View Dependent Claims (6, 7, 8, 9)
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10. A method of treating a stenosis comprising the steps of:
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providing a balloon catheter comprised of an elongated catheter having a delivery lumen, said elongated catheter having a distal section and an expandable balloon mounted on the distal section of said catheter, an elongated core member disposed within the delivery lumen of said catheter, said elongated core member including a stop member extending radially outward from said elongated core member, and a self-expanding stent mounted on said elongated core member and engaging said stop member so that said self-expanding stent can be moved through said delivery lumen when said elongated core member is moved through said delivery lumen, inserting the balloon catheter into a vessel of a patient;
advancing the balloon catheter through the vessel until the balloon catheter is positioned across a stenosis within the vessel;
inserting the self-expanding stent mounted on the elongated core member into the delivery lumen of the elongated catheter and advancing the self-expanding stent and elongated core member distally through the delivery lumen until the self-expanding stent is aligned approximate the stenosis;
expanding the balloon;
withdrawing the elongated catheter proximally to thereby allow the self-expanding stent to expand within the vessel;
disengaging the self-expanding stent from the elongated core member; and
,withdrawing the balloon catheter and the elongated core member from the vessel of the patient.
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11. A method of treating a stenosis comprising the steps of:
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providing a balloon catheter comprised of an elongated catheter having a delivery lumen, said elongated catheter having a distal section and an expandable balloon mounted on the distal section of said elongated catheter, an elongated core wire including a stop member extending radially outward from said elongated core wire, and a self-expanding stent comprised of a small diameter skeletal tubular member having a thin wall, said wall of said skeletal tubular member including a plurality of cells which are formed by a plurality of interconnected strut members, said self-expanding stent being mounted on said elongated core wire and engaging said stop member so that said self-expanding stent can be moved through said delivery lumen when said elongated core wire is moved through said delivery lumen;
inserting the balloon catheter into a blood vessel of a patient;
advancing the balloon catheter distally through the blood vessel until the balloon catheter is positioned across a stenosis within the blood vessel;
inserting the self-expanding stent mounted on the elongated core wire into the delivery lumen of the elongated catheter and advancing the self-expanding stent and elongated core wire distally through the delivery lumen until the self-expanding stent is aligned with the stenosis;
expanding the balloon;
contracting the balloon;
withdrawing the elongated catheter proximally to thereby allow the self-expanding stent to expand within the blood vessel;
disengaging the self-expanding stent from the elongated core wire; and
,withdrawing the elongated catheter and the elongated core wire from the blood vessel of the patient.
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12. A method of treating a stenosis comprising the steps of:
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providing a guidewire, a balloon catheter comprised of an elongated catheter having a delivery lumen and an inflation lumen, said elongated catheter having a distal section and an inflatable balloon mounted on the distal section of said elongated catheter and communicating with the inflation lumen, an elongated core member including a proximal cylindrical member disposed about said elongated core member, and a distal cylindrical member disposed about said elongated core member and positioned distally of said proximal cylindrical member and being spaced apart from said proximal cylindrical member to define a gap having a predetermined length, and a self-expanding stent comprised of a small diameter skeletal tubular member having a thin wall, said wall of said skeletal tubular member including a plurality of cells which are formed by a plurality of interconnected strut members, a cylindrical anchor member being placed on one of said plurality of strut members, said cylindrical anchor member having a length less than the length of the gap between the proximal cylindrical member and the distal cylindrical member, and said self-expanding stent being mounted on one of said cylindrical members such that said cylindrical anchor member is interlocked within said gap and between said proximal cylindrical member and said distal cylindrical member to thereby retain said stent on said elongated core member;
inserting the balloon catheter into a blood vessel of a patient over the guidewire;
advancing the guidewire and the balloon catheter until the balloon catheter is positioned across a stenosis within the blood vessel;
removing the guidewire;
inserting the self-expanding stent mounted on the elongated core member into the delivery lumen of the elongated catheter and advancing the self-expanding stent and elongated core member distally through the delivery lumen until the self-expanding stent is aligned approximate the stenosis;
injecting a fluid into the inflation lumen of the elongated catheter to thereby inflate the balloon;
removing the fluid from within the inflation lumen to thereby deflate the balloon;
withdrawing the elongated catheter proximally to thereby allow the self-expanding stent to expand within the blood vessel;
disengaging the cylindrical anchor member from the gap to thereby release the self-expanding stent from the elongated core member; and
,withdrawing the balloon catheter and the elongated core member from the blood vessel of the patient.
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Specification