Stent delivery catheter with folded sleeve and method of making same
First Claim
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1. A stent delivery catheter comprising:
- a catheter shaft having proximal and distal ends and an inflation lumen therein;
a tubular balloon having proximal and distal ends, the balloon being mounted on and wrapped around the catheter shaft adjacent the distal end thereof and in communication with the inflation lumen;
an elastic tubular sleeve having proximal and distal ends and a premounted length, the sleeve being mounted snugly around the balloon with a sleeve mounted length that is shorter than the premounted length such that excess sleeve material develops during the mounting of the sleeve on the catheter, the sleeve proximal and distal ends being fixed to the catheter shaft adjacent the proximal and distal ends of the balloon respectively;
an expandable stent having first and second ends and being shorter in length than the balloon, the stent being crimped about the sleeve and the balloon; and
wherein the excess sleeve material is gathered and formed into a first circumferential fold lying over the first end of the stent.
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Abstract
A stent delivery catheter and method for making the same includes a tubular balloon, an elastic sleeve, and a stent. The balloon is mounted around a catheter shaft, and the stent is crimped onto the balloon. The elastic sleeve is positioned between the balloon and the stent, the sleeve extending beyond the ends of the stent where the ends of the sleeve are fixed to the catheter shaft. Sleeve material is gathered and folded over the ends of the stent to retain the stent snugly against the balloon during delivery.
25 Citations
15 Claims
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1. A stent delivery catheter comprising:
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a catheter shaft having proximal and distal ends and an inflation lumen therein;
a tubular balloon having proximal and distal ends, the balloon being mounted on and wrapped around the catheter shaft adjacent the distal end thereof and in communication with the inflation lumen;
an elastic tubular sleeve having proximal and distal ends and a premounted length, the sleeve being mounted snugly around the balloon with a sleeve mounted length that is shorter than the premounted length such that excess sleeve material develops during the mounting of the sleeve on the catheter, the sleeve proximal and distal ends being fixed to the catheter shaft adjacent the proximal and distal ends of the balloon respectively;
an expandable stent having first and second ends and being shorter in length than the balloon, the stent being crimped about the sleeve and the balloon; and
wherein the excess sleeve material is gathered and formed into a first circumferential fold lying over the first end of the stent. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A stent delivery system for a medical catheter, the system comprising:
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an elongate, relatively inelastic balloon having a central axis and proximal and distal ends, the balloon being uninflated and furled about the axis;
an expandable tubular stent being mounted around the balloon, the stent having first and second ends and being shorter than the balloon; and
an elastic tubular retainer being mounted between the stent and the balloon and extending beyond the ends of the stent, the retainer having formed therein a first circumferential fold that lies over the first end of the stent to hold the stent against the balloon. - View Dependent Claims (9, 10, 11, 12, 14, 15)
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13. A method of making a stent delivery catheter, comprising the steps of:
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(a) providing an elongate catheter shaft having proximal and distal ends and an inflation lumen;
(b) providing a tubular balloon having proximal and distal ends and mounting the balloon adjacent to and about the distal end of the catheter shaft and in fluid communication with the inflation lumen;
(c) wrapping the balloon around the catheter shaft;
(d) providing a sleeve comprising an elastic material, and having proximal and distal ends and a premounted length, and mounting the sleeve snugly about the balloon with the sleeve ends fixed to the shaft adjacent the balloon ends;
(e) providing a tubular stent having open ends and a stent length that is shorter than the balloon, and crimping the stent about the sleeve and the balloon; and
(f) gathering and forming the sleeve material into at least one circumferential fold that lies over at least one end of the stent.
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Specification