Patent ID: 8758296
Filing Date: 2014-06-24
Classification: A61M

Abstract:
1. A syringe comprising: a barrel including a gripping flange at a proximal end, an end wall at a distal end defining an opening, an internal shoulder at a location spaced from the end wall, and a sidewall structure comprising an exterior surface and an interior surface defining an interior cavity; a plunger including a tubular body having a shoulder, an interior cavity disposed in the interior cavity of the barrel, a push flange at a proximal end, and a plunger tip holder including a push end; an elastomeric plunger tip mounted on the elastomeric plunger tip holder, the plunger tip having a hollow space such that a hollow cavity is defined by an interior surface of the elastomeric plunger tip and the plunger tip holder; a carriage including an elongated body having a spring located thereon, a base extending from the elongated body, a shoulder positioned between the elongated body and the base, and a passage receiving a needle; wherein the spring is compressed by the end wall of the barrel and the shoulder on the carriage and the carriage is removably and frictionally secured to the barrel by a resilient holding tire wedged between the base of the carriage and the interior surface of the barrel; wherein the plunger comprises three plunger positions including a first plunger position in which the elastomeric plunger tip is spaced apart from the carriage, a second plunger position in which the elastomeric plunger tip simultaneously contacts the shoulder on the tubular body and the internal shoulder on the barrel while the resilient holding tire is positioned on the base of the carriage, and a third plunger position in which the push end on the plunger has pushed the resilient holding tire distally off of the base of the carriage; and wherein the elastomeric plunger tip and the plunger are movable relative to one another when the plunger moves from the second plunger position to the third plunger position.