Composite safety self-destruct syringe

Abstract

A composite safety self-destruct syringe comprises: an injection barrel, wherein the bottom wall of the injection barrel is radially recessed to form a first retaining groove; an injection rod movably passed into the injection barrel, wherein the lower end of the injection rod is tightly fitted to the inner wall of a needle cylinder, the injection rod has a cavity inside, the bottom wall of the injection rod is radially recessed to form a second retaining groove, a spring sleeve capable of moving up relative to the injection rod is mounted at the lower portion of the cavity of the injection rod, and a fastener is fixed to the lower end of the spring sleeve; a seal ring arranged at the bottom end of the injection barrel and is tightly fitted to the inner wall of the injection barrel, and the middle of the seal ring is provided with a through hole; a needle seat including a first segment, a second segment and a third segment from bottom to top, wherein the diameter of the first, second and third segments of the needle seat decreases sequentially. A needle is fixed in a cavity of the needle seat. The invention is intended to provide the composite safety self-destruct syringe, composite safety self-destruction can be achieved for the syringe, safety of usage is ensured, and medical accidents are avoided.

Description

technical field [0001] The invention relates to a syringe, in particular to a composite safety self-destruction syringe. Background technique [0002] With the wide application of syringes, in order to avoid cross-infection of medical patients, more and more self-destructing syringes appear on the market. Self-destructing syringes are disposable syringe products that can prevent reuse after use. There are various types , after the injection is completed, depending on manual or mechanical force, the push rod cannot be drawn out of the syringe to achieve self-locking, or the sealing performance of the piston is destroyed, or the push rod of the syringe can be inferred, and finally achieve the purpose of preventing reuse . [0003] There are also a variety of retractable self-destructing syringes on the market. This type of syringe is equipped with a specific assembly structure so that the needle tube can be retracted into the syringe after injection to achieve the self-destru...

AI Technical Summary

Problems solved by technology

[0003] There are also a variety of retractable self-destructing syringes on the market. This type of syringe is equipped with a specific assembly structure so that the needle tube can be retracted into the syringe after injection to achieve the self-destruct function. However, the retractable self-destructing syringe of this type Safety performance restricts the widespread promotion of this product. When users use the syringe, they usually need to draw the liquid medicine multiple times for dispensing. Because the air in the syringe needs to be completely discharged, the injection rod must be pushed to the zero position of the syringe. This operation It is prone to safety problems. When the injection rod is pushed to the zero position, the self-destruct function of the syringe is triggered, making the syringe unusable. During the process, the self-destruct function of the syringe is triggered, causing the needle tube to be pulled out accidentally in the patient's body, which may cause medical accidents

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