Patent ID: 6752782
Filing Date: 2004-06-22
Classification: A61M

Abstract:
An automatically retractable safety syringe to be adopted for injecting medicine comprising: a needle cannula, and a rotary and movable needle hub; an expandable retracting spring receiving a needle assembly in an interior space for storing kinetic energy; a breakable retracting plunger configured for breaking into a retracting rod and a hollow receiving tube; a plunger rubber gasket; a needle hub rubber gasket; a needle cap covering and guarding the needle assembly and clipping onto a retaining hook of a medicine barrel, such that, when the needle cap is not separated from the retaining hook of the medicine barrel, the retaining hook is not able to eject and the needle assembly cannot retract; an interior of the medicine barrel has a space for the needle assembly, the retracting spring, the breakable retracting plunger and the plunger rubber gasket; whereby, when the retracting spring area is over a halfway retracting state, the breakable retracting plunger drives the needle assembly and compresses the retracting spring; after the breakable retracting plunger breaks into two-parts the retracting rod and the hollow receiving tube, the retracting spring expands to move the needle assembly into the interior of the medicine barrel and the retracting rod into an interior of the hollow receiving tube for accomplishing the automatically retracting action.