Patent ID: 8858508
Filing Date: 2014-10-14
Classification: A61M

Abstract:
1. An injection device comprising: a housing having a proximate end and a distal end, the distal end having an opening therein; a cartridge barrel within the housing, the cartridge barrel having proximate and distal ends; a needle cannula fixed to the distal end of the cartridge barrel; a stopper within the cartridge barrel; a driver coupled to the stopper; a shield coupled to the housing and slidable between a retracted and an extended position; a spring activateable to urge the shield from the retracted position to the extended position; and at least one deformable side arm forming a portion of said driver and releasably retaining the spring in a compressed state, wherein the at least one side arm is biased into slidable contact with an exterior surface of said cartridge barrel and deflects radially inwardly at an end profile of the distal end of the cartridge barrel and, in turn, release the spring such that the spring slides past the at least one side arm and applies a force to the shield to urge the shield into the extended position.