Delivery and detachment systems and methods for vascular implants

摘要

A system for delivering an implant device to a vascular site in a patient a delivery pusher apparatus, an implant device detachably connected to the delivery pusher apparatus by a tether having a distal end connected to a proximal end of the implant device, wherein the tether is substantially non-tensioned when connecting the implant device to the delivery pusher, and an electrical heating element configured coaxially around at least a portion of the tether, wherein heat generated by the heating element severs the tether at a point near the proximal end of the implant device.

主权项

1. An implant delivery system comprising:
a delivery pusher; an implant device detachably connected to the delivery pusher by a tether having a distal end connected to a proximal end of the implant device, wherein the tether is substantially non-tensioned when connecting the implant device to the delivery pusher; and an electrical heating element comprising:
an electric coil arranged coaxially around at least a portion of the tether and having a heat-generating zone, the coil being operable to achieve a temperature in the heat-generating zone that is sufficient to sever the tether, the electric coil comprising a first plurality of windings having a first pitch and a second plurality of windings having a second pitch that is greater than the first pitch;wherein the first plurality of windings are in a first winding zone, and the second plurality of windings are in a second winding zone located distally from the first winding zone.