1
R David McNaughton: Syringe shield. Karen M Gerken, Martin P Hoffman, Mitchell B Wasson, October 17, 1989: US04874383 (121 worldwide citation)

Disclosed are hypodermic syringes having special safety features for preventing the user from inadvertently pricking himself with the needle. In the preferred embodiment the barrel of, for example, a syringe is provided with a sleeve that can be drawn out over the needle and firmly locked into posit ...


2
R David McNaughton: Syringe shield. Hoffman Wasson & Gitler, June 18, 1991: US05024660 (58 worldwide citation)

Disclosed are hypodermic syringes having special safety features for preventing the user from inadvertently pricking himself with the needle. In the preferred embodiment the barrel of, for example, a syringe is provided with a sleeve that can be drawn out over the needle and firmly locked into posit ...