Instrument for implanting an artificial hip joint socket pan in the acetabulum has a structured head which grips a peak passage without contact to position it without distortion or damage

摘要

The instrument to position the socket of an artificial hip joint in the acetabulum, with an inlet as the sliding surface to work with the ball of the prosthesis in a conical clamped fit within the socket, has a passage opening at the pole zone of the inlet with a bell and a head (10) at the leading end. The outer contour (50) of the head matches the inner contours (30) of the socket pan (40), but with slightly smaller dimensions, so that the head can be placed without contact within the socket pan (40). The head (10) has a guide pin (100) to be set into the passage opening (110) at the peak of the socket pan (40), with a unit (130) to apply radial forces at its circumference. When the pin (100) has been inserted in the passage (110), the unit (130) bears against the inner wall of the passage opening (110) through the forces acting radially outwards. The head (10) has at least one elastic spacer (80), as an O-ring, which holds the outer contours (50) clear of the inner contours (30) of the socket pan (40) during the insertion process.