Methods and apparatus for luminal stenting

摘要

Stent delivery systems and methods of use are provided. The systems can include a catheter, a core member, and engagement member, and a stent. The catheter can have a inner wall. The core member can extend within the catheter and having a distal segment. The engagement member can be attached to the distal segment. Further, the stent can be positioned within the catheter and extend over the engagement member. The stent can have an axial length that is greater than an axial length of the engagement member. The engagement member can have an expanded state in which the engagement member presses the stent against the catheter inner wall for engaging the stent to move the stent along with the core member relative to the catheter.

主权项

1. A stent delivery system, comprising:
a catheter having an inner wall that defines a lumen; a core member extending within the catheter, the core member having a distal segment; a self-expanding stent having a length and extending along the core member distal segment radially positioned between the core member and the catheter inner wall; an expandable engagement member attached to the core member and extending distally beyond the distal segment of the core member, the engagement member being positioned radially between the core member and the stent and having a length less than 60% of the stent length, the engagement member having (i) an advancement configuration in which the engagement member is expanded within the catheter to press the stent against the catheter inner wall and transmit axial movement of the core member to the stent for moving the stent within the catheter lumen relative to the catheter and (ii) an expansion configuration in which the engagement member extends distally beyond the catheter lumen and expands to a diameter greater than a diameter of the lumen to urge the stent to a fully expanded state; wherein the engagement member comprises first and second end portions, the first end portion coupled to the core member, the second end portion positioned distal to and longitudinally spaced apart from a distal end of the core member to permit the second end portion to move freely relative to the core member.