| 摘要 |
A rotational surgical instrument (10) including a working head (12) connected to a rotatable, pencil-like handle (11). The handle includes a casing (13) with distal and proximal end caps (19,20), an elongated outer member (14) extending into the casing, and an actuation link (16) extending from the distal end cap through the casing and elongated member to the working head. An actuating mechanism (17) is positioned distally from the distal end cap about the proximal portion of the elongated member for slideably actuating the working head between open and closed positions. A compression spring (43) is included in the passageway of the casing around the actuation link between the proximal end cap and the proximal end of the elongated member to return the working head to the nonactuated position. Keyed surfaces (47,49) are included within the passageway of the casing and attached to the distal end of the casing and the proximal end of the elongated member for preventing rotation of the elongated member with respect to the casing and actuation link. A spring (21) is also positioned between the distal end cap and the actuating mechanism for varying the combined tension of the two springs for operating the handle. The variable tension spring is varied by rotating a knob of the actuating mechanism which adjusts the distance from the distal end cap. <IMAGE> |
