Patent ID: 7955370

Claim:
A medical device comprising: a catheter, the catheter having a catheter shaft, a portion of the catheter shaft defining a stent receiving region; a sheath, the sheath being disposed about the catheter shaft and being longitudinally moveable relative thereto, a distal portion of the sheath defining a stent retaining region, the sheath being moveable between an extended position and a retracted position, in the extended position the retaining region being disposed about the stent receiving region, in the retracted position the sheath being removed from the stent receiving region; a membrane, a distal region of the membrane being engaged to a distal portion of the sheath, a proximal region of the membrane being engaged to a portion of the catheter shaft proximal of the stent receiving region, in the extended position the membrane being positioned between the catheter shaft and the sheath and a portion of the membrane being disposed about at least a portion of the stent receiving region, in the retracted position the membrane being removed from about the at least a portion of the stent receiving region; and a fluid chamber, the fluid chamber having a proximal region and a distal region, the proximal region being defined by the catheter shaft and the sheath, in the extended position the distal portion of the fluid chamber being defined by the membrane and the sheath and in the retracted position the distal portion of the fluid chamber being defined by said membrane.