Patent ID: 9199043
Filing Date: 2015-12-01
Classification: A61M,Y10T

Abstract:
1. A syringe piston comprising: a piston body having a fluid end and an actuator end opposite the fluid end; a piston seal coupled to the piston body and located between the fluid end and the actuator end, wherein the piston seal forms an interference fluid seal with an interior wall of a syringe barrel; a check valve seal coupled to the piston body and positioned such that the piston seal is located between the check valve seal and the actuator end, the check valve seal having a major outer surface that faces a main fluid chamber of the syringe barrel; and a gas entrapment zone defined between the check valve seal and the piston seal, wherein the check valve seal allows one-way gas flow from the main fluid chamber of the syringe barrel and into the gas entrapment zone, and the piston seal inhibits or prevents gas flow from the gas entrapment zone.