Patent ID: 8241255

Claim:
An injection device, comprising: a syringe comprising a proximal end, a distal end, and a plunger extending from the proximal end, the syringe having proximal and distal pockets; a guard slidably attached to the syringe and having a proximal end and a distal end, the guard being biased from a first position wherein the distal end of the syringe is exposed towards a second position wherein the guard covers the distal end of the syringe; first cooperating detents on the syringe and guard for retaining the guard in the first position; second cooperating detents on the guard for engaging the syringe pockets for retaining the guard in the first position, and for retaining the guard in the second position; and a latch member extending proximally from the guard, the latch member being engageable by the plunger as the plunger is advanced into the syringe for releasing the first cooperating detents whereupon the guard may slide toward the second position.