| 主权项 |
1. An impactor for positioning and inserting an acetabular cup into an acetabulum of a pelvis during hip arthroplasty, the impactor comprising:
an elongated body including a stem having a proximal end and an opposed distal end; a cup-engaging element disposed at the proximal end of the stem, the cup-engaging element being adapted to engage the acetabular cup for insertion into the acetabulum; an impact element disposed at the distal end of the stem and adapted to receive a force used to drive the acetabular cup into the acetabulum, the stem defining a longitudinal axis extending between the cup-engaging element and the impact element, the longitudinal axis thereby defining an impact axis; a guide element mounted to the elongated body, the guide element having first and second openings aligned with each other to define an axial passage extending therebetween, a guide axis centrally disposed within the first and second openings and extending through the axial passage, the first and second openings being spaced apart an axial distance along said guide axis, the first and second openings and the axial passage receiving a guide pin therethrough, the guide pin adapted to be pinned in a fixed position relative to the pelvis, the guide pin defining a pin axis extending longitudinally through a center thereof; and wherein the guide element provides a mechanical orientation guide which restricts an angular orientation of the impactor relative to the guide pin when the guide pin is pinned in the fixed position relative to the pelvis and received through the first and second openings of the guide element, and wherein centering the openings of the guide element relative to the guide pin in the fixed position achieves a desired orientation of the impactor within a predetermined angular tolerance. |
