| 摘要 |
A surgical cannula apparatus includes a sheath (32) having proximal and distal ends, a flexible member (34) in the sheath and movable longitudinally therein, the member (34) having proximal and distal ends, and a surgical instrument (104) operable by movement of the member (34) with respect to the sheath. The apparatus further includes an operating device (10) comprising a body (12) which slidably receives a slide (48) for movement longitudinaily of the body. The body (12) has a generally cylindrical interior and the slide (48) has a pair of longtudinally spaced walls (44,46) of circular shape. The walls have aligned apertures which rotatably receive a stem (70) which has proximal and distal ends, and the proximal end of the flexible member (34) is fixed to the distal end of the stem (70). The proximal end of the sheath (32) is fixed to the body (12). The stem has a thumbwheel (84) accessible through the wall of the body, the thumbwheel being manipulatable to rotate the membar (34) in the sheath (32). The slide (48) includes a rack and the body supports an additional thumbwheel (58) having gear teeth which engage the rack. Manipulation of the second thumbwheel causes the slide (48) to move longitudinally within the body to move the flexible member (34) longitudinally in the sheath. |
