Patent ID: 9289557
Filing Date: 2016-03-22
CPC Classification: A61M

Claim Text:
1. A stopper for use within a syringe barrel, the stopper comprising: a main body portion having a flexible roof, the main body portion defining an open rearward end configured to receive a plunger rod such that a space is defined between the flexible roof and the plunger rod, the main body portion manufactured from a rigid or semi-rigid polymeric material having an elastic modulus in the range of about 0.01 GPa to about 5 GPa; and a first perimetrical skirt extending around and defining a gap with respect to an outer circumference of the main body portion, wherein, when fluid pressure is increased inside the syringe barrel during an injection: a) the increased fluid pressure causes the flexible roof of the main portion to flex inwardly into the space defined between the flexible roof and the plunger rod and expand in a radial direction toward an inner wall of the syringe barrel; and b) the increased fluid pressure in the gap causes the first perimetrical skirt to bend such that the first perimetrical skirt flexes toward the inner wall of the syringe barrel is forced against an inner wall of the syringe barrel.