Patent ID: 8672878
Filing Date: 2014-03-18
Classification: A61M

Abstract:
1. A syringe for dispensing anesthetic from a cartridge having an interior wall defining a hollow interior sized and shaped for receiving a dose of anesthetic, and a piston, the syringe comprising: a tubular plunger slidably received in the hollow interior of the tubular cartridge, said plunger having a hollow interior extending between a distal end shaped for engaging the piston and an open proximal end opposite the distal end; and a plunger rod slidably received in the hollow interior of the tubular plunger, the rod having a sharp distal end adapted to penetrate the piston, a proximal end, and a length extending between the distal end and the proximal end sized so that a delivery portion of the rod extends through the piston into the cartridge when the rod is driven through the piston, said delivery portion including a recess for receiving a buffering agent to reduce acidity of the dose of anesthetic.