Delivery system having stent retention structure

摘要

A drainage stent delivery system including an elongate shaft of a medial device, a drainage catheter or stent, and an interference fit member for selectively coupling the drainage stent to the elongate shaft. The drainage stent is selectively coupled to a distal portion of the elongate shaft by an interference fit between the interference fit member and the drainage stent such that axial movement of the elongate shaft relative to the drainage stent moves the interference fit member from a first position in which the interference fit member is engaged with the drainage stent and forms an interference fit with the drainage stent to a second position in which the interference fit member is disengaged from the drainage stent.

主权项

1. A stent delivery system comprising:
an elongate shaft of a medical device, the elongate shaft having a proximal end and a distal end; a non-expandable tubular stent having a proximal end, a distal end, and a lumen extending therethrough, the lumen being defined by an inner surface of the tubular stent, the tubular stent positioned on and surrounding a distal portion of the elongate shaft; and an interference fit member positioned on and axially fixed at a plurality of axially spaced apart points relative to the elongate shaft and movable therewith, the interference fit member configured to cooperate with the inner surface of the tubular stent to form an interference fit therebetween; wherein axial movement of the elongate shaft relative to the tubular stent moves the interference fit member from a first position in which the interference fit member is positioned within the lumen of the tubular stent and forms an interference fit with the inner surface of the tubular stent to retain the tubular stent on the elongate shaft during delivery of the tubular stent to a target site to a second position in which the interference fit member is positioned exterior of the lumen of the tubular stent to release the tubular stent from the elongate shaft.