| 摘要 |
A needle assembly includes an elongate square cross-sectioned needle mount (10), a needle (12), and a sheath (14) mounted on the needle mount (10) for reciprocal axial movement between a forward position whereat the sheath (14) covers the needle (12) and a rearward position whereat the needle (12) is exposed. The sheath (14) is bifurcated at its rearward end to define opposed resilient members (30) which engage a portion (18) situated rearwardly of first ramps (24) when the sheath (14) is in a rearward injecting position. Subsequent to injection occurring, the sheath (14) is axially rotated throug h 90 degrees relative to the needle mount (10) to disengage the resilient members (30) from the ramps (24). The sheath (14) then automatically slides under the action of a compression spring to the forward position so that the resilient members (30) lockingly engage second ramps (26), rendering the needle (12) safe.
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