Pull back stent delivery system

Claim 1

A delivery system for implantation of a medical device in a vessel, comprising: a medical device; and elongate flexible catheter means having proximal and distal ends for delivering a medical device to a predetermined location in a vessel of a patient, the elongate flexible catheter means being further comprised of: an inner shaft which carries the medical device near its distal end, a middle pull back shaft concentrically arranged around the inner shaft, the medical device being carried between the inner shaft and middle pull back shaft, and an outer stiffening shaft concentrically arranged around the middle pull back shaft, the inner and outer shafts being connected at their proximal ends to prevent axial movement of the inner shaft with respect to the outer shaft, whereby the medical device is delivered at the desired site by pulling on the proximal end of the middle pull back shaft, which deploys the medical device, and where the outer stiffening shaft connection to the inner shaft prevents axial movement of the inner shaft with respect to the outer stiffening shaft, thereby preventing the distal end of the inner shaft from being urged forward during delivery and therefore allowing for more accurate placement of the medical device.