self-aspirating syringe

Abstract

The invention discloses a syringe capable of pumping automatically. The syringe comprises a syringe needle, a cylinder, a piston rod and a round piston rod pressing handle, wherein the piston rod pressing handle and a blocking edge serve as concentric circles with the identical diameter; an air bag is arranged between the piston rod pressing handle and the blocking edge; the two ends of the air bag are respectively fixed with the piston rod pressing handle and the blocking edge; the air bag encircles the piston rod; a reverse valve and an aeration nozzle are arranged on the surface of the air bag; a sealing cover is arranged on the aeration nozzle; the reverse valve allows gas to flow from outside to inflate the gas bag. According to the syringe disclosed by the invention, the gas bag is inflated to push the piston rod to move, so as to allow the syringe needle to pump liquid, realize automatic control, and control the pumping speed through the inflation speed.

Description

technical field [0001] The invention relates to a syringe capable of automatic suction, belonging to the field of medical instruments. Background technique [0002] A syringe is a common medical appliance. The syringe is composed of a needle barrel with a small hole at the front end and a matching piston rod. Syringes are used to inject or withdraw small amounts of liquids into or from otherwise inaccessible areas. When the core rod is pulled out, the liquid or gas is sucked from the small hole at the front end of the syringe, and the liquid or gas is squeezed out when the core rod is pushed in. The process of withdrawing or injecting gas or liquid with a syringe and needle is called injection. [0003] At the same time, the syringe also has a suction function. The most commonly used in medical practice is to use the syringe to draw blood for the diagnosis of diseases. In the preparation of micro-dosage, use the syringe to suck the liquid medicine to realize the transfer ...

AI Technical Summary

Problems solved by technology

And in practical application, it is very frequent to use the syringe to suck the liquid. Only relying on the user's experience to use the traditional syringe in many suction situations will cause very serious consequences, and for inexperienced When a person uses a traditional syringe to achieve the suction function, it becomes more serious later, not only the waste of raw materials, but also the safe disposal of the raw materials that are pumped out, and even the failure of the experiment, the death of the strain, etc.

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