Patent ID: 8876781

Claim:
A safety pen needle device, comprising: a generally tubular hub having a proximal, a distal end, an attachment device arranged at the distal end and configured for attaching the safety pen needle device to a medicament container, and a coaxially arranged needle attachment member; an injection needle having an injection end and a non-injection end, and extending through the needle attachment member; an actuation sleeve coaxially and rotationally positioned inside the proximal end of the hub; a generally tubular first needle shield having a proximal and a distal end and surrounding the proximal end of the hub; a first spring device coaxially arranged between the first needle shield and the actuation sleeve for urging the first needle shield in the proximal direction, such that the first needle shield covers the injection end of the needle; a second back-end needle shield coaxially arranged inside the distal end of the hub; and a second spring device coaxially arranged between the second needle shield and the hub for urging the second needle shield in the distal direction; wherein the second needle shield includes at least one first holding member configured to cooperate with a corresponding at least one second holding member arranged on the actuation sleeve for holding the second needle shield in a position exposing the non-injection end of the needle in a pre-penetration state; the first needle shield includes at least one first guide member configured to cooperate with at least one first guide track arranged on the actuation sleeve when the first needle shield is moved from an extended position surrounding the injection end of the needle to a retracted position, such that the actuation sleeve is rotated and thereby the at least one first holding member is released; and the hub includes at least one second guide member configured to cooperate with at least one second guide track arranged on the actuation sleeve when the first needle shield is moved from the extended position to the retracted position and vice versa, such that when the first needle shield is moved from the retracted position to the extended position, the actuation sleeve is further rotated and thereby the at least one first guide member of the first needle shield abuts a first stop member arranged on the actuation sleeve for locking the first needle shield in the extended position.