| 摘要 |
2051806 9112843 PCTABS00007 This invention is a lockable and retractable safety cap for covering the needle of a hypodermic syringe to prevent accidental needle-stick. There is a unitary cap assembly (30) of a resiliently flexible plastic material including a hub portion (32) disposed concentrically about a base portion of the needle and attached to the barrel, a sliding safety hub portion (36) having a bore (38) therethrough slidably disposed with the needle passing through the bore and extending over a point end of the needle, and a plurality of slats (40) extending between the hub portion and the sliding safety hub portion. The slats are parallel to the needle whereby a longitudinal compressive force against the sliding safety hub portion is resisted by a longitudinal compressive resistance of the slats which must be overcome before the slats will deform and flex outward from the needle to expose the needle for use. A releasable safety latch assembly (52) can be disposed over the slats for preventing deforming and outward flexing thereof. The preferred assembly comprises a coil spring (60) disposed over the slats, a sliding collar (58) carried by an outer end of the coil spring, a retaining button (56) located on one of the slats adjacent the inner end for holding the sliding collar to retain the coil spring in a compressed state, and a release for releasing a hold on the sliding collar when the slats bend outward whereby following use of the syringe the coil spring is released and returns to an extended state.
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