Filtering and injection syringe needle

Abstract

The invention provides a filtering and injection syringe needle which comprises a steel needle, an upper needle seat, a lower needle seat, a check valve, a gasket and a filtering membrane. A lower needle seat cavity and a check valve cavity are formed at the rear end of the upper needle seat; the check valve cavity comprises a circular truncated-cone-shaped inner side wall and a cylindrical inner side wall; a ring-shaped groove is formed in the end face of the small end of the circular truncated-cone-shaped inner side wall; the center of the ring-shaped groove is communicated with a steel needle mounting hole; the big end of the circular truncated-cone-shaped inner side wall is connected with the cylindrical inner side wall; the circular truncated-cone-shaped inner side wall is provided with a groove connected with the ring-shaped groove; a triangular plate is vertically arranged at the bottom of the ring-shaped groove; a connection portion is arranged at the front end of the lower needle seat; a valve element is arranged at the center of the connection portion; the filtering membrane sleeves the rear end of the valve element; a barrel of the check valve sleeves the valve element; the gasket is arranged at the front end of the barrel of the check valve at the end part of the valve element; the connection portion is inserted into the lower needle seat cavity and is in interference fit with the lower needle seat cavity. According to the filtering and injection syringe needle provided by the invention, filtering and injection processes are automatically carried out, and the syringe needle does not need to be replaced, so that possibility of bacterial and virus pollution is avoided.

Description

technical field [0001] The invention belongs to the field of medical instruments, in particular to a filter injection needle. Background technique [0002] As we all know, most of the injections currently used clinically are packaged in glass bottles. When the needle of the syringe is used to pierce the rubber stopper or cut the glass bottle with a grinding wheel to extract the medicinal solution, the bottle stopper chips or glass powder will enter the injection solution. Traditional syringes do not have a filter function. When liquid medicine is drawn, these impurities will be drawn into the syringe and injected directly into the patient, thereby inducing diseases such as venous inflammation. [0003] Chinese invention patent application CN102600535A discloses an injection needle with a precision filter, including a needle tube and a needle seat with an inner through hole, and the inner through hole of the needle seat includes an upper part with a smaller aperture, a lower ...

AI Technical Summary

Problems solved by technology

Since the liquid inlet channel and the liquid outlet channel of the injection needle are the same channel, the injection needle needs to be replaced again after filtration, but there is a risk of contamination by bacteria or viruses during the replacement process of the filter needle and the injection needle, and the clinical operation is also inconvenient

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