Percutaneous medical device delivery system

A method of delivering a direct cardiac compression device into a thoracic cavity of a subject, the method comprising:

• a) inserting a distal end of a delivery sheath of a delivery system configured to deliver a direct cardiac compression device through an incision in a pericardium below an apex of a heart in the skin of subject,
• wherein the delivery system comprises:
• i) the delivery sheath that comprises an internal lumen,
• ii) a plurality of delivery arms contained within the internal lumen of the delivery sheath and extending along a longitudinal axis of the internal lumen of the delivery sheath, wherein distal ends of the delivery arms comprise fasteners configured to engage with basal and apical structures of the direct cardiac compression device, and
• iii) removable release wires or release lines configured to engage with the fasteners to hold the basal and apical structures of the direct cardiac compression device in place at the fasteners;
• wherein the direct cardiac compression device comprises:
• i) the apical structure and the basal structure which are parallel to each other and flexibly connected to each other by a plurality of helically-arranged fibers spanning between the basal structure and the apical structure, wherein the helically-arranged fibers are enclosed within a cup-shaped sleeve, wherein the apical structure is rotatable relative to the basal structure and wherein the direct cardiac compression device is expandable from a collapsed state to an expanded state, and
• ii) a motor housed within a motor housing and coupled to the apical structure of the direct cardiac compression device;
• wherein the motor housing comprises a suture ring fitted around and sealed to the motor housing:
• b) deploying the direct cardiac compression device using the delivery arms of the delivery system from the distal end of the delivery sheath to around the heart intra-pericardium;
• wherein the direct cardiac compression device is in the collapsed state within the delivery sheath and expands into the expanded state once deployed from the delivery sheath;
• and wherein the delivery arms quide, position, and hold the direct cardiac compression device in the expanded state around the heart;
• c) securing either the apical structure, the basal structure, or both to the heart;
• d) securing the suture ring of the motor housing to the pericardium to close the pericardial sac:
• e) releasing the direct cardiac compression device from the delivery arms, and
• f) removing the delivery system from the subject.