Pull-back self-locking syringe

Abstract

The invention relates to the technical field of medical instruments, and in particular to a pull-back self-locking syringe. The syringe comprising a syringe body and a core rod movably disposed in thesyringe body. The syringe body is provided with a self-locking structure; the core rod is provided with a first frustum matched with the self-locking structure; the piston sleeves the core rod; the piston is internally provided with an elastic member; the core rod moves forward so that the first frustum crosses the self-locking structure, and the elastic member is compressed and drives the core rod to pull back; and the rear end surface of the first frustum abuts the self-locking structure. The pull-back self-locking syringe of the present invention comprises the self-locking structure disposed on the syringe body and the first frustum disposed on the core rod and matched with the self-locking structure. In the process of pushing the core rod forward, the first frustum passes over the self-locking structure, a first boss presses the elastic member on the piston, and the elastic member always pulls back the core rod, so that the rear end face of the first frustum always abuts the self-locking structure to achieve self-locking and prevent the syringe from being reused.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a retractable self-locking syringe. Background technique [0002] Safety syringes are disposable sterile medical devices used to inject drugs to patients. They can avoid cross-infection and are easy to use. They are widely recognized by doctors and patients. At present, there are many types of safety syringes, but the design of their parts is complicated. The assembly is not easy, resulting in high cost; and most safety syringes have insufficient needle withdrawal resistance, and the needle tip is easily retracted into the jacket, causing the liquid medicine to leak and cause pollution. Contents of the invention [0003] The technical solution adopted by the present invention to solve the above problems is to provide a pull-back self-locking syringe, which includes a cylinder body and a core rod that is movably arranged in the cylinder body. A self-locking structure is ...

AI Technical Summary

Problems solved by technology

[0002] Safety syringes are disposable sterile medical devices used to inject drugs to patients. They can avoid cross-infection and are easy to use. They are widely recognized by doctors and patients. At present, there are many types of safety syringes, but the design of their parts is complicated. Difficult to assemble, resulting in high cost; and most safety syringes have insufficient needle withdrawal resistance, and the needle tip is easily retracted into the jacket, causing the liquid medicine to leak and cause pollution

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