ACETABULAR REAMER WITH LOCKING COLLAR

摘要

A acetabular reamer (10) for reaming an acetabulum, reaction forces being exerted onto the acetabular reamer by the acetabulum when the acetabulum is reamed, the acetabular reamer comprising: a body (12), the body (12) defining a rotation axis (13) about which the acetabular reamer (10) is rotatable; a reaming element (14, 14', 14") operatively coupled to the body (12) so as to be movable between a reaming element inner position and a reaming element outer position relatively thereto, the reaming element (14, 14', 14") being positioned further away from the rotation axis in the reaming element outer position than in the reaming element inner position; an actuator (16) operatively coupled to the reaming element (14, 14', 14") for moving the reaming element (14, 14', 14") between the reaming element inner and outer positions; and a reaming element lock (18) configurable between a locked configuration and an unlocked configuration, the reaming element lock (18) being operatively coupled to the reaming element (14, 14', 14") in a manner such that when the reaming element lock (18) is in the unlocked configuration, the reaming element (14, 14', 14") is substantially freely movable by the actuator (16) between the reaming element inner and outer positions, and when the reaming element lock (18) is in the locked configuration, the reaming element lock (18) substantially prevents the reaming element (14, 14', 14") from moving relatively to the body (12); the reaming element lock (18) being configured, sized and operatively coupled to the reaming element (14, 14', 14") and the body (12) in a manner such that when the reaming element lock (18) is in the locked configuration and the reaction forces are exerted onto the reaming element (14, 14', 14"), a larger portion of the reaction forces is transmitted to the body (12) than to the actuator (16).