Patent ID: 8454558

Claim:
A hollow syringe barrel for use within a syringe mixing system for mixing a two-part dental composition, the hollow syringe barrel comprising: a hollow body including a continuous cylindrical wall defining an internal chamber for containing a first component, the hollow body having a proximal end and a distal dispensing end; a single dispensing orifice at the distal dispensing end of the hollow body through which a first component contained in the internal chamber can be dispensed; and a sealing plug and a rupturable membrane integrally formed together as a single piece, wherein the sealing plug is laterally disposed around the distal dispensing end of the hollow body, has an outer diameter so as to seal against an inner wall of a syringe barrel and has a distal end that terminates at or near the single orifice at the distal dispensing end of the hollow body, wherein the rupturable membrane caps and seals off the single orifice until irreversible rupture of the rupturable membrane by application of sufficient pressure on a first component contained in the internal chamber so as to irreversibly rupture the rupturable membrane. wherein the rupturable membrane has a cross-sectional thickness that is substantially less than a cross-sectional thickness of the sealing plug to facilitate rupture of the rupturable membrane during use.