Cannula tips, tissue attachment rings, and methods of delivering and using the same

摘要

A surgical cannula system. The surgical cannula system includes a cannula (60) having a proximal end, a distal end, and a lumen (82) extending therebetween. A tissue attachment ring (110), being configured to be coupled to a biological tissue (74), includes a lumen (117) extending therethrough. A locking mechanism (119) has a first locking state, in which the cannula (60) is configured to move with respect to the tissue attachment ring (110), and a second locking state, in which movement of the cannula (60) with respect to the tissue attachment ring (110) is resisted.