Transcatheter prosthetic heart valve delivery device with passive trigger release

A system for restoring a defective heart valve of a patient, the system comprising:

• a prosthetic heart valve having a stent frame and a valve structure attached to the stent frame, the stent frame defining a distal region and a proximal region, the proximal region forming at least one post;
• and
• a delivery device comprising:
• a delivery sheath terminating at a distal end and defining a lumen, an inner shaft assembly slidably disposed within the lumen and including an engagement structure,
• a release assembly for selectively coupling the prosthetic heart valve relative to the inner shaft assembly, the release assembly defining a central axis and including:
• a base coupled to the inner shaft assembly proximal the engagement structure,
• a retraction member distal the base and configured to self-retract in longitudinal length from an extended condition to a relaxed, retracted condition,
• a release member distal the retraction member and configured to self-expand in radial projection relative to the central axis from a compressed condition to a normal, expanded condition,
• a retention member distal the release member;
• wherein the system is configured to provide a loaded mode in which the prosthetic heart valve is retained within the delivery sheath and to the inner shaft assembly, including the at least one post slidably captured to the engagement structure by the retention member, with the retraction member in the extended condition and the release member in the compressed condition.