Patent ID: 8540670
Filing Date: 2013-09-24
Classification: A61M

Abstract:
1. A syringe assembly, comprising: a syringe barrel having an inside surface defining a chamber, an open proximal end, a distal end, and an outlet disposed adjacent the distal end in fluid communication with the chamber; a plunger assembly disposed at least partially within the syringe barrel, comprising an elongate plunger rod and a plunger head having a distal sealing surface and a proximal end surface, the proximal end surface of the plunger head having a continuous perimeter and the plunger rod and the plunger head being integrally connected; and a retaining ring lock disposed on the inside surface of the barrel and extending into the chamber of the barrel and defining an engagement surface about a perimeter of the chamber of the barrel, the retaining ring lock adapted to engage and retain the plunger head in a locked position at least partially within the chamber of the barrel, wherein the engagement surface of the retaining ring lock engages the continuous perimeter of the proximal end surface of the plunger head in a perimetrical engagement when the plunger head is in the locked position, and wherein the plunger assembly is formed as a single, monolithic piece.