| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a disposable type puncture instrument having a novel structure which enables retention of a lancet in a puncture preparation position where the lancet is locked at a position in which a spring member is compressed and puncture operation by cancelling the locking through reliable and stable operation.SOLUTION: A housing 12 and a locking ring 72 which is separate from a lancet 14 are employed. Rotations of the lancet 14 about a central axis with respect to the housing 12 are prevented, and rotations of the locking ring 72 are also prevented by locking the locking ring 72 at the lancet 14. On the other hand, a malfunction preventing mechanism is provided for allowing rotations of the locking ring 72 in a puncture preparation position as the blocking of rotations of the locking ring 72 is canceled by the movement of the lancet 14 in an axial direction with respect to the locking ring 72.</p> |
