Low-residual safe self-destructing injector

[0033] see figure 1 , figure 2 , image 3 , the present invention comprises a hollow syringe 1, a push rod 2 sliding in the syringe, a rubber plug 3 mounted on the front end of the push rod, a needle holder 4 is installed on the front end of the syringe 1, and the needle holder 4 is supported by a support seat 5 , the lower end of the support seat 5 is in interference fit with the inner wall of the syringe, the inner side of the support seat 5 is provided with an elastic claw 6, and the front end of the push rod 2 is connected to the cone 8 through the core 7 passing through the rubber plug 3, after the injection of the cone 8 is completed Engage with the elastic claw 6.

[0034] The bottom of the cone 8 at the front end of the push rod 2 collides with the top 3 of the rubber plug when it is not injected, and the rubber plug 3 is hollow (see Figure 10). The push rod is provided with a stopper 10 that pushes against the rubber plug, and the stopper 10 also plays a role in f...

[0041] The syringe shown in this embodiment has the same structure except that the structure of the rubber stopper is different from Example 1.

[0042] Referring to Fig. 18 and Fig. 19, the rubber plug 3' in this embodiment is also a hollow type, the difference is that a ring of flange 9' is formed on the lower part of the rubber plug, and the stopper 10 is located under the flange 9', and is connected with the flange The edge 9' is opposed to each other, and the core 7 of the push rod is provided with a second stopper 10', and the second stopper 10' is located in the hollow cavity of the rubber plug 3' and is close to the flange 9'. There is a large gap between the inner wall of the rubber plug 3' and the card core 7, that is, the wall of the rubber plug 3' is relatively thin, and the rubber plug is compressed and deformed by the reaction force generated by the injection liquid and the thrust of the stopper 10 during injection. Due to the effect of the second stopper 10', on...