| 摘要 |
An installation tool has a head for engaging an acetabular cup, and an elongated member mounting the head adjacent an end that projects from the head and is insertable into an opening through the cup. The member end is expandable for engaging the cup at the opening to prevent movement of the cup relative to the member end and hold the cup in engagement with the head in order to move the cup with movement of the member end to place the cup for implanting at a desired position. The member end also is contractable for releasing the cup after implanting at the desired position. The elongated member is composed of a tubular shaft having a passage therethrough and a rod slidably disposed through the shaft passage. The member end is composed of a split collet with expandable and contractable jaws on one end of the shaft and an outwardly flared cam element formed on one end of the rod and extending between the collet jaws. A knob is mounted on the shaft and threadably fitted on the rod such that manual rotation of the knob in one or the other opposite directions will cause sliding movement of the rod relative to the shaft and of the cam element relative to the collet jaws to correspondingly expand or contract the jaws into or out of engagement with the cup at the central opening thereof.
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