System to aid in the removal of a foldable stent (stent) from a placement device

摘要

Placement device (10; 10 ') for an implantable medical device (11) having a retention member (4) at one end thereof, the placement device comprising: an axis (24; 24') extending in a longitudinal direction and defining a longitudinal axis; an elongated sheath (22; 22 ') surrounding the longitudinal portion of the shaft, the sheath being slidable with respect to the axis in the longitudinal direction; a compartment (28; 28 ') defined inside the sheath, and adapted to receive the medical device in an assembled condition; a retainer (30; 30 '; 30a; 30b) located at one end of the compartment, the retainer including a cavity (36) adapted to receive the medical device retention member in the assembled condition; characterized in that an energy storage element is located in the longitudinal portion of the shaft and is configured to be radially compressed by the medical device when the elongated sheath covers the compartment containing the medical device, in which the energy storage element it is an elastomeric element (40; 40 ') that surrounds at least a part of the longitudinal portion of the shaft, and a surface of the elastomeric element has a plurality of higher portions (43) and a plurality of lower portions (44) distributed in a circumferential direction around the longitudinal axis.