| 摘要 |
An attachment for standardized hypodermic syringes which is characterized by a protector tube that slides over the syringe and is secured by a catch spring comprised of a split ring that constricts onto the hub that carries the syringe needle and has resilient legs that engage in the longitudinal slot in the protector tube, a detent at an outer end of the slot for retracted postioning of the protector tube exposing the needle, and a lock shoulder (shoulders) at an inner end of the slot for permanent extended positioning of the protector tube covering the needle.
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