Cannula for receiving surgical instruments

摘要

A cannula (10) receives surgical instruments for performing a surgical procedure on a body. The cannula (10) comprises a tube structure (12) defining a passage (16) through which the surgical instruments are inserted into the body. The tube structure (12) has a proximal end (20) and a distal end (62). The tube structure (12) includes an expandable portion (40) for enabling an increase in the cross-sectional area of the passage (16) at the distal end (62). The expandable portion (40) of the tube structure (12), when expanded, has a conical configuration.