Patent ID: 8961581
Filing Date: 2015-02-24
Classification: A61F,A61M

Abstract:
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 stent having a proximal end, a distal end, and a central longitudinal axis, the stem positioned on and surrounding a distal portion of the elongate shaft; and an engagement member having an inner surface and an outer surface, the engagement member positioned between an inner surface of the stent and an outer surface of the elongate shaft, the engagement member configured to be elongated from a first length to a second length greater than the first length by longitudinal movement parallel to the central longitudinal axis of the stent to release the stent; wherein when at the first length the engagement member has a first thickness measured from a point on the inner surface of the engagement member that is intersected by a line extending radially outward from and perpendicular to the central longitudinal axis to a point on the outer surface of the engagement member that is intersected by the line extending radially outward and perpendicular to the central longitudinal axis, and when at the second length the engagement member has a second thickness measured from a point on the inner surface of the engagement member that is intersected by a line extending radially outward from and perpendicular to the central longitudinal axis to a point on the outer surface of the engagement member that is intersected by the line extending radially outward from and perpendicular to the central longitudinal axis, the second thickness being less than the first thickness; wherein when at the first length the engagement member is engaged with the inner surface of the stent to secure the stent on the distal portion of the elongate shaft, and at the second length the engagement member is sufficiently disengaged from the inner surface of the stent to release the stent from the distal portion of the elongate shaft such that the elongate shall may be withdrawn from the stent.