초록 ▼

An automatically retractable safety syringe includes a needle assembly consisting of a cannula, a needle hub and a rubber O-ring, a needle cap, a retracting spring, a breakable and retractable plunger, a plunger gasket and a medicine barrel; in accordance with the structure of the said automatically

An automatically retractable safety syringe includes a needle assembly consisting of a cannula, a needle hub and a rubber O-ring, a needle cap, a retracting spring, a breakable and retractable plunger, a plunger gasket and a medicine barrel; in accordance with the structure of the said automatically retractable safety syringe of the present invention, since the breakable plunger is assembled inside the medicine barrel, after being pushed all the way to the end, it is forced to break automatically into two parts for reducing it's length so as to provide enough space for the retracting spring to drive the needle assembly moving along the sliding passages for accomplishing an automatically retracting action.

대표청구항 ▼

1. 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 configure

1. 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. 2. The automatically retracting safety syringe according to claim 1, wherein one end of the needle hub receives the needle cannula fitly penetrating the center thereof for flowing the medicine; the circumference of the other end is disposed with an annular rubber gasket groove; a convex torus is disposed as a check plate at one end of a retracting spring; a plurality of concave positioning slits are disposed at two ends of the needle hub to connect a plurality of proceeding slopes tapered upwards, a plurality of rotating slide passages concaved inwardly and slanted for rotation as well as to connect a plurality of communicating slide passages concaved inwardly to form at least more than two U-shaped slide passages for the needle assembly to make retracting action. 3. An The automatically retracting safety syringe according to claim 1, wherein the retracting rod of the breakable retracting plunger has a rubber clip head on a first end to clip with the plunger rubber gasket, a second end of the retracting rod is connected to a first end of the hollow receiving tube with a breakable cutting edge area formed therebetween; a second end of the hollow receiving rod is disposed with a push grip; an annular bottom check ring is located on an outer periphery of the hollow receiving tube controlling the bottom position of the syringe; an annular fastening annular groove controls and fastens the breakable retracting plunger to break into two parts and rotates the needle assembly for completing inwardly retraction. 4. The automatically retracting safety syringe according to claim 1, wherein a first end of the cylindrical medicine barrel is disposed with a plurality of resilient retaining hooks pointing internally for engaging the needle hub; a second end is disposed with a handle lug; an aperture of the first end of cylindrical medicine barrel is smaller than an interior thereof to form a check ring for retaining the retracting spring; the second end of the cylindrical medicine barrel is disposed with an annular convex ring for controlling and positioning the bottom check ring and the fastening annular groove.