Patent ID: 8663305

Claim:
A graft delivery system comprising: a graft cover retractor including: a hollow slotted screw gear including an outer surface, and threads extending from the outer surface; a hollow graft cover advance nut having: a first inner surface; a second inner surface distal to the first inner surface; a proximal end edge surface positioned between the first inner surface and the second inner surface; and threads extending from the second inner surface, wherein the hollow slotted screw gear is mounted within the hollow graft cover advance nut so that threads of the hollow slotted screw gear engage the threads of the hollow graft cover advance nut; and a spacer graft cover anchor affixed to a graft cover and having a distal end configured to removably fit within a proximal end of the hollow graft cover advance nut between threads of the hollow slotted screw gear and the first inner surface of the hollow graft cover advance nut, wherein the spacer graft cover anchor is slidable relative to the hollow graft cover advance nut, wherein when the distal end of the spacer graft cover anchor is within the proximal end of the hollow graft cover advance nut and is in contact with the proximal end edge surface of the hollow graft cover advance nut, and the hollow graft cover advance nut is rotated about the hollow slotted screw gear in a first rotational direction, the graft cover is retracted; and when the distal end of the spacer graft cover anchor is within the proximal end of the hollow graft cover advance nut and the spacer graft cover anchor is slid in a proximal direction longitudinally relative to the hollow graft cover advance nut and along the hollow slotted screw gear, the distal end of the spacer graft cover anchor is removed from within the proximal end of the hollow graft cover advance nut, and the graft cover also is retracted by the sliding.