| 摘要 |
PURPOSE: A position determining apparatus of a cotyloid cavity by using a photo-electron system is provided to improve the accuracy of a direction and a position of the cotyloid cavity by installing a pin on a correct center of the cotyloid cavity as monitoring the position of the cotyloid cavity. CONSTITUTION: A plate(10) is provided with a plurality of luminous devices(11) on a surface thereof with a lattice structure so that a camera(110) of a photo-electron system(120) photographs a luminous spot to transmit it to the photo-electron system(120). A hollow shaft(20) is fixed on a side of the plate(10) toward an axial direction. A direction control member(40) is connected to a lower portion of the hollow shaft(20) and moved along a surface shape of the cotyloid cavity(300). The pin(30) is continuously installed through the hollow shaft(20) and the direction control member(40) and a lower end of the pin(30) is pinned around a center of the cotyloid cavity(300).
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