| 摘要 |
An inner cylindrical member has a first pair of locking projections on opposite sides of the member at a proximal end and has an extension to which a syringe needle is secured. A second pair of resilient locking projections are spaced from the first pair forming an axially extending locking recess there between at the proximal end. The resilient projections depress to a release position. A pair of finger gripping tabs protrude from the distal end. An outer cylindrical member receives the inner member in its bore. The outer member has an extension which receives the inner member extension and which extensions have mating detents for releasably securing the members in a needle extended use position with the members juxtaposed in nested concentric relation. The outer member at a distal end has projections which mate in the locking recesses at the proximal end to lock the outer member in an extended needle protective position. The resilient locking projections may be depressed to release the locked outer member so it can be displaced to the nested relation of the needle extended position in those cases where the syringe is supplied in the needle protected state of the members. After use, the outer member can be returned to the locked needle protected state.
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