A cannula includes a body portion having circumferential openings at the distal end thereof and a removable tip incorporated at the distal end of the body portion, the removable tip having circumferential tabs for releasably interlocking with the circumferential openings of the cannula. The removable tip serves as an obturator, and it is positioned within the distal end of the cannula, such that the cannula and obturator are combined into a single unitary cannula assembly.
