Stent delivery system having stent securement apparatus

Abstract

A system/assembly for delivery and deployment of an inflation expandable stent within a vessel, comprising a catheter having proximal and distal ends; a stent, inflation expandable from a delivery diameter to a deployment diameter, such that the delivery diameter is reduced from the deployment diameter for conforming the stent to the catheter, such that the stent, in its delivery diameter, is coaxially mounted on the catheter near the catheter distal end; an expandable inflation means coaxially mounted on the catheter axially within the stent, for expansion of the stent from the delivery diameter to the deployment diameter upon application of fluid deployment pressure to the inflation means; and a securement component coaxially mounted on the catheter, axially within the expandable inflation means, the securement component designed and adapted to provide a securement pressure to the stent in the delivery diameter to maintain the stent in position on the catheter during delivery to the deployment site.

What is claim is: 
     
         1 . A medical device, comprising:
 an elongate shaft including a first tubular member and a second tubular member;   a balloon coupled to the shaft;   a first member coupled to the first tubular member and positioned within the balloon, the first member including a distal stop with a tapered distal portion;   a second member coupled to the first tubular member and positioned within the balloon, the second member having a distal end disposed proximal of a proximal end of the distal stop; and   a medical implant coupled to the shaft and positioned adjacent to the balloon.   
     
     
         2 . The medical device of  claim 1 , wherein the first tubular member is an inner tubular member and wherein the second tubular member is an outer tubular member. 
     
     
         3 . The medical device of  claim 2 , wherein an inflation lumen is defined between the inner tubular member and the outer tubular member, the inflation lumen being in fluid communication with the balloon. 
     
     
         4 . The medical device of  claim 3 , wherein the balloon has a proximal portion coupled to the outer tubular member and wherein the balloon has a distal portion coupled to the inner tubular member. 
     
     
         5 . The medical device of  claim 4 , wherein the proximal portion of the balloon is adhesively bonded to the outer tubular member. 
     
     
         6 . The medical device of  claim 4 , wherein the distal portion of the balloon is adhesively bonded to the inner tubular member. 
     
     
         7 . The medical device of  claim 1 , wherein the distal stop includes a proximal end face extending substantially perpendicular to a longitudinal axis of the elongate shaft. 
     
     
         8 . The medical device of  claim 1 , wherein the second member is a support member configured to support the medical implant. 
     
     
         9 . The medical device of  claim 1 , wherein the second member includes a distal portion having a substantially constant outer diameter. 
     
     
         10 . The medical device of  claim 1 , wherein the first member and the second member are longitudinally spaced from each other. 
     
     
         11 . The medical device of  claim 1 , wherein the medical implant includes a stent. 
     
     
         12 . The medical device of  claim 1 , wherein the medical implant is configured to be expanded by expanding the balloon. 
     
     
         13 . The medical device of  claim 1 , wherein the first member, the second member, or both include a radiopaque marker. 
     
     
         14 . A system for delivering a medical device, the system comprising:
 a catheter shaft, the catheter shaft including an inner tubular member and an outer tubular member;   a balloon coupled to the catheter shaft;   a distal stop including a tapered distal portion attached to the inner tubular member and positioned at least partially underneath the balloon;   a proximal member attached to the inner tubular member and positioned underneath the balloon, the proximal member having a distal end disposed proximal of a proximal end of the distal stop; and   a cardiovascular implant disposed along the catheter shaft, the cardiovascular implant being configured to shift between a first configuration and an expanded configuration.   
     
     
         15 . The system of  claim 14 , wherein an inflation lumen is defined between the inner tubular member and the outer tubular member, the inflation lumen being in fluid communication with the balloon. 
     
     
         16 . The system of  claim 15 , wherein the balloon has a proximal portion coupled to the outer tubular member and wherein the balloon has a distal portion coupled to the inner tubular member. 
     
     
         17 . The system of  claim 14 , wherein the distal stop includes a proximal end face extending substantially perpendicular to a longitudinal axis of the catheter shaft. 
     
     
         18 . The system of  claim 14 , wherein the proximal member includes a distal region having a substantially constant outer diameter. 
     
     
         19 . The system of  claim 14 , wherein the distal stop and the proximal member are longitudinally spaced from each other. 
     
     
         20 . The system of  claim 14 , wherein the cardiovascular implant includes a stent. 
     
     
         21 . The system of  claim 14 , wherein the cardiovascular implant is configured to be expanded by the balloon. 
     
     
         22 . The system of  claim 14 , wherein the distal stop, the proximal member, or both include a radiopaque marker. 
     
     
         23 . A medical device for implanting a medical implant, the medical device comprising:
 a catheter shaft, the catheter shaft including an inner tubular member and an outer tubular member;   a balloon attached to the catheter shaft;   wherein a proximal portion of the balloon is coupled to the outer tubular member and a distal portion of the balloon is coupled to the inner tubular member;   wherein an inflation lumen is defined between the inner tubular member and the outer tubular member, the inflation lumen being in fluid communication with the balloon;   wherein a body portion of the balloon extends over an implant receiving region of the inner tubular member;   a distal stop including a tapered distal portion attached to the inner tubular member adjacent to the implant receiving region;   wherein at least a portion of the distal stop is disposed within the balloon;   a proximal member attached to the implant receiving region and positioned between the implant receiving region and the body portion of the balloon, the proximal member having a distal end disposed proximal of a proximal end of the distal stop; and   an implantable endoprosthesis disposed along the catheter shaft, the implantable endoprosthesis being configured to be received along the implant receiving region.   
     
     
         24 . The medical device of  claim 23 , wherein the distal stop includes a proximal end face extending substantially perpendicular to a longitudinal axis of the catheter shaft. 
     
     
         25 . The medical device of  claim 23 , wherein the proximal member includes a distal region having a substantially constant outer diameter. 
     
     
         26 . The medical device of  claim 23 , wherein the distal stop and the proximal member are longitudinally spaced from each other. 
     
     
         27 . The medical device of  claim 23 , wherein the implantable endoprosthesis includes a stent. 
     
     
         28 . The medical device of  claim 23 , further comprising a radiopaque marker coupled to the inner tubular member. 
     
     
         29 . The medical device of  claim 23 , wherein the implantable endoprosthesis is designed to be expanded by the balloon. 
     
     
         30 . A system for delivering an implantable medical device, the system comprising:
 a catheter shaft, the catheter shaft including an inner tubular member and an outer tubular member;   wherein the inner tubular member has a distal end that extends distally beyond a distal end of the outer tubular member;   wherein the inner tubular member defines a guidewire lumen;   a balloon attached to the catheter shaft, the balloon being configured to shift between a collapsed configuration and an expanded configuration;   wherein a proximal portion of the balloon is coupled to the outer tubular member and a distal portion of the balloon is coupled to the inner tubular member;   wherein an inflation lumen is defined between the inner tubular member and the outer tubular member, the inflation lumen being in fluid communication with the balloon;   wherein a body portion of the balloon extends over an implant receiving region of the inner tubular member;   a distal stop attached to the inner tubular member at a position adjacent to the implant receiving region, the distal stop being disposed at least partially between the balloon and the inner tubular member;   wherein at least a section of the distal stop is tapered;   a proximal member attached to the implant receiving region and being positioned between the implant receiving region and the body portion of the balloon;   wherein the distal stop has a proximal end disposed adjacent to a distal end of the proximal member;   a first radiopaque marker disposed along the implant receiving region and positioned adjacent to the distal stop;   a second radiopaque marker disposed along the implant receiving region and positioned adjacent to the proximal member;   wherein the first radiopaque marker is axially spaced from the second radiopaque marker; and   an implantable endoprosthesis disposed along the catheter shaft and configured to be received along the implant receiving region, the implantable endoprosthesis being configured to be expandable by the balloon.