Blood sampling assembly with a retractable needle

摘要

The blood sampling assembly includes a retractable double-ended needle 26 so that a vial may be passed through an opposed end 30 of the needle to obtain a blood sample. The assembly includes a hollow cylinder 10 including circumferentially spaced seat tabs 20 which allow a needle seat 40 and the needle 26 supported thereon to be released upon rotation of tube 62 with respect to hollow cylinder 10. The extractor assembly includes a stopper 66 for maintaining a vacuum within tube 62 to withdraw the needle to a retracted position within the tube 62 upon rotation of the tube 62, the end cap 92, and the stopper retainer 70. A stopper tab positioner 84 rotationally connects the stopper 66 to the cylinder 10.