Dispensing injection needle with one-way filtration function

Abstract

The invention relates to a dispensing injection needle with a one-way filtration function. The dispensing injection needle comprises a needle tube, a needle holder and a filter device, wherein the needle tube is fixed at the front end of the needle holder; the filter device is arranged in a liquid medicine channel of the needle holder; a liquid extraction channel and a liquid pushing channel which are mutually isolated are formed in the filter device; inlets and outlets of the liquid extraction channel and the liquid pushing channel are connected with the liquid medicine channel; a filter membrane is arranged at an inlet end of the liquid pushing channel; a check valve mechanism is arranged at an inlet end of the liquid extraction channel; a one-way valve structure is arranged in the liquid pushing channel. When the dispensing injection needle with the one-way filtration function executes liquid extraction and liquid pushing, the liquid medicine flows through the liquid extraction channel and the liquid pushing channel, impurities are isolated in an injection syringe through the filter membrane in a liquid pushing process, and safety of liquid extraction and liquid pushing is guaranteed.

Description

Technical field [0001] The invention relates to a medical needle, in particular to a medicine dispensing injection needle with one-way filtering function. Background technique [0002] At present, intravenous infusion and injection are the most commonly used treatment methods in medical treatment. Infusion [0003] Previously, it was often necessary to mix some powders with glucose liquids or liquids. specific [0004] The operation method is: insert the syringe into the liquid medicine bottle to draw a small amount of liquid medicine; [0005] The ejector is inserted into the powder bottle, and the liquid medicine is injected into the powder bottle; wait until the powder and liquid are completely dissolved [0006] Afterwards, draw the mixed solution into the infusion bottle or directly into the syringe. [0007] However, in the actual use of the above injection dosing device, during the dispensing process, when the dissolving liquid or liquid medicine in the ampoule is extracted, th...

AI Technical Summary

Problems solved by technology

The usual practice of existing dispensing injection needles is to set a filter device (such as a filter membrane) in the infusion pipeline to filter these solid drug powder particles and rubber debris. Rubber crumbs, etc. are blocked on one side of the filter device (such as a filter membrane). If the injection is reversed, the particles blocked on the side of the filter device (such as a filter membrane) will flow back, causing harm to the patient's body; Some also added a one-way valve to prevent backflow. These needles are only suitable for drawing liquid medicine and dispensing medicine, and cannot be suitable for pushing liquid backward at the same time.

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