Patent ID: 9265890
Filing Date: 2016-02-23
CPC Classification: A61M

Claim Text:
1. A syringe piston comprising: a piston body having a tip, a base opposite the tip, and an outer seal-retaining surface between the tip and the base, the base including a retaining shoulder that extends outwardly from the base and the base defines a cavity; a piston sealing cover coupled to the piston body, the piston sealing cover overlying the tip and coupled around the outer seal-retaining surface, and the piston sealing cover comprising a fin-shaped fluid seal element to form an interference fluid seal with an interior wall of a syringe barrel, the fin-shaped fluid seal element located near the tip of the piston body and having a surface that faces the base of the piston body, the piston sealing cover including a circumferential end seal element that extends outwardly from the piston sealing cover, the circumferential end seal element spaced a distance apart from the fin-shaped fluid seal element along the piston sealing cover, and the piston sealing cover is coupled to the piston body such that the circumferential end seal element contacts the retaining shoulder of the base, wherein the surface is concave.