Patent ID: 7481797
Filing Date: 2009-01-27
Classification: A61M

Abstract:
1. A safety syringe assembly, comprising: an elongated, generally cylindrical barrel having a hollow interior forming a hollow nozzle located at a distal end of said barrel and opening into the interior of said barrel; a plunger slidably mounted in said barrel and having a longitudinal open channel; a needle; a needle holder mounting said needle at a distal end thereof and slidably mounted in said longitudinal open channel of said plunger for movement between an advanced position in which said needle on the distal end of said needle holder projects from a distal end of said nozzle, and a retracted position in which said needle is retracted within said barrel; a compression spring mounted inside of said barrel, and a spring retainer element located in and locked to said barrel and having a stabilizing surface extending along and about a portion of the internal wall of said barrel, and a spring support portion extending from said stabilizing surface interiorly of said barrel and supporting a distal end portion of said spring against expansion, said spring retainer also having a through opening for freely receiving said needle holder therethrough; said spring urging said needle holder toward its retracted position; and a latch having an engaged position in which said needle holder is latched relative to said barrel to hold said needle holder in its advanced position against the urging of said spring, and a disengaged position in which said needle holder is unlatched relative to said barrel to allow said spring to expand in a proximal direction to move said needle holder to its retracted position.