| 摘要 |
A safety arrangement for a medical needle (15) has a support (14) for carryi ng the mount end of the needle, and a sleeve (16) slidably mounted on the suppo rt (14) for movement from an initial position to a retracted position and then back to a protecting position where the sleeve (16) covers the tip (21) of t he needle (15). A spring (32) urges the sleeve towards its protecting position and a blocking member (23) projects forwardly from the support (14) and is movable between non-blocking and blocking positions. In the non-blocking position the sleeve (16) is free to slide from its initial position to its retracted position. On movement of the sleeve to its protecting position, th e blocking member (23) moves to lie between the support (14) and sleeve (16) t o prevent subsequent movement of the sleeve away from its protecting position. A control mechanism (27) releases the blocking member (23) so that it may move from its non-blocking position to its blocking position, the mechanism (27) being controlled by movement of the sleeve (16) from its initial position at least partway towards its retracted position.
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