DELIVERY SYSTEM WITH HOOKS FOR RESHEATHABILITY

摘要

Flexible implantable devices or stents can navigate tortuous vessels of the neurovasculature. The devices can also conform to the shape of tortuous vessels of the vasculature. In some embodiments, the devices can direct blood flow within a vessel away from an aneurysm or limit blood flow to the aneurysm. Methods and structures are provided for adjusting, along a length of the device, the porosity of the device while maintaining a cross-sectional dimension. In some embodiments, small hooks releasably engage the stent at a proximal end and are able to resheath the stent by retracting a proximal retaining member where the hooks are coupled to. The hooks straighten, unfurl, or otherwise disengage the stent when either unrestrained by a catheter or when coming into contact with an external stimulus found in the patient's vasculature.

主权项

1. A stent delivery system comprising:
an elongate body having a distal portion, a proximal portion, and an inner surface extending from the distal portion to the proximal portion, the distal portion being configured to extend within a blood vessel of a patient; a stent expandable from a compressed configuration to an expanded configuration, the stent having a proximal region and a distal region; a stabilizing member extending into an interior of the proximal region of the stent; and one or more hook members extending distally from the stabilizing member, each hook member having a proximal section and a distal section, each hook member having a more curved configuration wherein the distal section of each hook member releasably engages the proximal region of the stent with at least a portion of the proximal section being radially engaged between the proximal region of the stent and the elongate body and with at least a portion of the distal section extending through one or more interstices in the stent and curving proximally on a radially inward side of the stent, and each hook member having a less curved configuration wherein the distal section of each hook member is disengaged from the stent, each hook member being biased to the less curved configuration when unrestrained.