| 摘要 |
A clamping cannula (10) comprises a generally rigid layer (12) having a first end (14), and a generally flexible tube (18) generally coaxial with the rigid layer. The flexible tube extends axially in a first direction beyond the first end. The cannula also has a generally rigid sleeve (22) movable between a cover position (Fig. 1), wherein the sleeve covers a first part of the flexible tube, and an uncovered position (Fig. 2), wherein the sleeve does not cover the first part of a flexible tube to enable clamping of the cannula. |
