Patent ID: 6712788
Filing Date: 2004-03-30
Classification: A61M

Abstract:
A disposable syringe comprising:a syringe body having a hollow inside and having a front and rear that are open, a plunger sliding inside the syringe body and being movable from a retracted syringe-filling position to a forward syringe-emptying position, said plunger being provided at the rear with a shaft that can be operated manually and brought out of the syringe body through the rear end thereof, an injection needle integral with a needle carrier attachable, directly or by means of supporting body to the fore end of the syringe body, hooking means operatively connected to said shaft of the plunger, able to hook said needle carrier to pull it inside the syringe body, elastic means retained under compression within said syringe body, retaining means operatively connected to said syringe body to retain said elastic means under compression, and engagement means operatively connected to said shaft able to cooperate with said retaining means to free said elastic means when said plunger has reached the end of the injection stroke, so that said elastic means can act on said shaft to cause retraction thereof into the retracted position, and locking means operatively connected to said shaft to block forward movement of said shaft, when it is in the retracted position, after the injection has been performed, said locking means comprising flexible longitudinal tongues, and the inside of said syringe body having an abutment surface constructed to abut against the end of said tongues of the shaft, when said shaft is in the retracted position after the injection has been performed, to prevent a possible forward movement of said shaft.