| 摘要 |
<p>A medical device (20) includes a barrel (21) with proximal and distal ends. A needle (24) extends from the distal end (29) of the barrel and terminates in a point. A shield (26) is coaxially and rotationally mounted on the barrel (21), This shield (26) is axially movable between a retracted position in which the needle point (30) is exposed and an extended position in which the needle point is covered. The device (20) includes locking elements associated with the barrel (21) and the shield (26). These locking elements are responsive to a combined rotational and axially distal movement of the shield (26), when the shield is at an extended and unlocked position, for locking the shield (26) on the barrel (21) at the extended position. These locking elements prevent subsequent rotational and axial movement of the shield (26) on the barrel (21). <IMAGE></p> |
