| 摘要 |
An elongated cannula with an inner tube (50) that is designed to cooperate with a corresponding outer tube (80). The cannula includes a cam mechanism, a plurality of flexible members (55) designed to expand and deploy when the inner and outer tubes move relative to each other, and a pressure ring (310) disposed on the outer tube. The inner and outer tubes are slidably moveable relative to each other in at least one direction. |
