| 摘要 |
A safety arrangement for a medical needle ( 15 ) has a support ( 14 ) for carrying the mount end of the needle, and a sleeve ( 16 ) slidably mounted on the support ( 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 the needle ( 15 ). A spring ( 32 ) urges the sleeve toward 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, the blocking member ( 23 ) moves to lie between the support ( 14 ) and sleeve ( 16 ) to 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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