Patent ID: 9623195
Date: 2017-04-18
CPC Classifications: A61M

Claim:
1. A needle assembly for connection to an injection pen having a boss with external threads for receiving the needle assembly, the needle assembly comprising: a sleeve having internal threads at one end for threaded engagement with the external threads of an injection pen boss, the sleeve defining at least one guide extending along a length thereof; a needle carrier slidably supported within the sleeve and having a lug engaged with the guide of the sleeve and projecting from the outer surface of the sleeve, the needle carrier supporting a double-ended needle extending axially within the sleeve; and a separate shield slidably supported on the sleeve and being engaged with a projecting part of the lug, whereby forward sliding movement of the shield moves the needle carrier forwardly within the sleeve, so moving a non-injection end of the needle further from said one end of the sleeve; wherein said one end of the sleeve is formed into two or more divided segments and the shield is mounted on the sleeve for sliding movement between a first position at which the shield maintains full radial engagement of the two or more divided segments with the external threads of the injection pen boss, and a second position where the shield is displaced from said one end so that radial disengagement of the external threads is possible by radial deformation of the two or more divided segments at said one end.