Patent ID: 6530906
Filing Date: 2003-03-11
Classification: A61M,Y10S

Abstract:
A safety syringe comprising:a barrel having a cylindrical body, a receiving hole, a grip lug fastened to a rear end of said cylindrical body, two fitting holes disposed oppositely in the direction of a longitudinal axis of said grip lug, two retaining holes disposed in said grip lug and opposite to inner sides of said fitting holes and in communication with said fitting holes; an elastic lashing member disposed in said grip lug of said barrel and provided with an elasticity enabling said lashing member to retract inwards, two locating pillars fixed on bases of the lashing member having at a free end thereof an arresting head, said arresting head being disposed in said fitting hole of said grip lug, said locating pillars being retained in said retaining holes, two slide confining portions being disposed in opposite inner sides of said bases and provided with a slide confining slot extending inwards; a plunger having a front rod body which is inserted into said receiving hole of said barrel and is provided in axial outer periphery thereof with two slide pieces, a rear rod body connected with a rear segment of said front rod body, a press portion connected with said rear rod body, a catching and turning portion disposed at a front end of said front rod body; a needle holder disposed in said receiving hole of said barrel and provided with a catching turning cooperating portion located at a rear end thereof to be caught and pulled by said catching and turning portion of said plunger, a needle connection portion for fitting said needle set; said slide pieces of said plunger being confined by said slide confining portion of said elastic lashing member such that said plunger cannot be turned at the time when said syringe is in use, said plunger arriving at a bottom in the wake of injection such that said plunger is not confined by said elastic lashing member, and that said plunger can be thus turned to actuate said needle holder, thereby enabling said needle holder to be drawn into an interior of said barrel by said plunger.