Patent ID: 8708970

Claim:
An injection needle assembly having opposite distal and proximal ends, comprising: an injection needle having proximal and distal pointed ends, wherein the distal pointed end is arranged to penetrate a membrane arranged at the proximal end of a medicament container; a tubular needle holder partially surrounding and fixedly connected to the injection needle, wherein the needle holder comprises on its outer circumferential a surface a distal engagement device and a proximal engagement device; a tubular cap, comprising a distal part having a container attachment device, a proximal part having a proximal outer engagement device on its outer circumferential surface, and a central passage having a proximal inner engagement device on its inner circumferential surface adapted for receiving the distal engagement device of the needle holder, where the container attachment device is integrally formed as part of the distal part of the tubular cap; and a tubular needle cover having an open distal end, comprising on its inner circumferential surface a first engagement device arranged to cooperate with the proximal engagement device of the needle holder, and a second engagement device arranged to cooperate with the proximal outer engagement device of the tubular cap, wherein the open distal end of the needle cover is sealed with a protective cover and where the open distal end has an inner diameter configured to surround and completely enclose the container attachment device when the protective cover is in sealing engagement with the open distal end; wherein the needle cover is arranged to be displaced from a first position, in which the second engagement device and the proximal outer engagement device prevent the needle cover and the needle holder from axial displacement by a linear displacement, to a second position, in which the needle cover is displaced and the needle holder is distally displaced; and the proximal inner engagement device of the tubular cap and the distal engagement device of the needle holder prevent the needle holder from proximal displacement but allow the needle cover to be removed.