| 摘要 |
<p>PURPOSE:To facilitate an aligning work of a receiving member to a patient by providing an engaging part on plural parts in a rod, and providing a rod-like stopper and a spring to a lock mechanism. CONSTITUTION:When a rod 32 is drawn out of a hole 28, an engaging part 52 of the rod 32 abuts on the tip part of a stopper 58. However, since the front of the engaging part 52 retracts toward the outside in the radial direction from the side of an axis and the tip part of the stopper 58 is a hemispherical or truncated conical shape, the stopper 58 is moved backward from the hole 28 against force of a spring 60. Accordingly, only by drawing out the rod 32 from the hole 28, an alignment of a first receiving member 36 to a patient can be executed. In this regard, at the time of returning the rod 32 and a first receiving member 36 to their original positions, the rod 32 is pushed into the hole 28 in a state that the stopper 58 is drawn against force of the spring 60 to a position where the tip part of the stopper 58 retracts from the hole 28. In this case, the stopper 58 can be drawn by utilizing its finger putting part 64.</p> |
