Filter needle head

Abstract

The invention provides a filter needle head. The filter needle head comprises a steel needle, an upper needle seat, a lower needle seat, a check valve and a filter diaphragm, wherein the steel needle is installed at the front end of the upper needle seat, the rear end of the upper needle seat is successively provided with a check valve cavity, a gasket cavity and a lower needle seat cavity, the front end of the lower needle seat is provided with an end wall, the middle part of the end wall is provided with a valve element, a blind hole is formed inside the valve element, the lower end of the blind hole penetrates through the end wall, the upper end of the blind hole is disposed inside the valve element and perpendicularly provided with a liquid outlet hole, one end of the liquid outlet hole is communicated with the blind hole, the other end of the liquid outlet hole is disposed on the side wall of the valve element, two sides of the valve element on the end wall are provided with a liquid inlet, the check valve comprises a check valve barrel, the lower end of the check valve barrel is provided with a gasket, the lower needle seat is in interference fit with the cavity of the lower needle seat, and the check valve and an annular filter membrane sleeve the valve element. A liquid inlet passage and a liquid outlet passage of the check valve do not interfere each other, the check valve barrel wraps the valve element in a way of being in surface contact with the valve element, so that the contact area is increased, the reliability is improved, and the check valve is relatively simple in machining and manufacturing process.

Description

technical field [0001] The invention relates to the field of medical appliances, in particular to a syringe needle with improved structure. Background technique [0002] Disposable injection needles have been used in the medical field for many years. The matching syringes are used for clinical muscle, intravenous, subcutaneous, intradermal injection or infusion. , so as to prevent cross-infection of patients. [0003] According to domestic and foreign literature reports, it is found that in the process of opening a glass ampoule, a large amount of invisible glass fragments will fall into the liquid medicine in the ampoule bottle, or, in the configuration process of the infusion liquid medicine, use During the process of the needle puncturing the rubber stopper of the vial or the large infusion container, rubber particles will be produced, and at the same time, foreign substances such as insoluble particles or foreign impurities will also exist in the liquid medicine itself....

AI Technical Summary

Problems solved by technology

When the syringe extracts the liquid medicine, all the particles, debris, and impurities present in the liquid medicine are drawn into the barrel of the injection molding device, while the ordinary injection needles used in China do not have a filter device, and the medicine is injected into the injection needle. During the process of injecting the liquid into the muscles or veins of the human body, all the particles, debris, and impurities in the liquid medicine are also injected into the human tissue. These foreign objects will cause serious damage to the patient, and even threaten the life of the patient in severe cases.

Images