Patent ID: 6866653

Claim:
A sequential injection syringe comprising a generally cylindrical barrel portion, a plunger and an intermediate disc being disposed in a spaced apart relationship within said barrel portion, each of said plunger and disc being sized to be in sealing engagement with said barrel portion, an outlet portion disposed generally at a distal end of said syringe, said outlet portion having an outlet opening through which fluids contained within said syringe are expelled, a first chamber for containing a first fluid within said syringe formed between the outlet portion and the disc, and a second chamber for containing a second fluid within said syringe formed between the disc and the plunger, said outlet portion having a radially enlarged portion with a protrusion in the radially enlarged portion that extends into an interior of the syringe, said protrusion being adapted to engage the intermediate disc in the radially enlarged portion as the disc is advanced to the syringe outlet opening, said radially enlarged portion being dimensioned to permit tilting of the disc in the syringe interior as the protrusion engages the disc and the disc loses sealing engagement with said syringe to thereby allow the second fluid to flow through the outlet opening after the first fluid has been substantially expelled therethrough.