Positive-pressure needle-free connecting piece

Abstract

The invention discloses a positive-pressure needle-free connecting piece comprising a shell with a hollow inner cavity, wherein the cross section of the shell is oval; the hollow inner cavity of the shell is internally provided with a rubber plug with a solid upper end part and a hollow lower end part; the cross section of the lower end part of the rubber plug is round; the lower end port of the shell is fixedly connected to the upper end of a connector base; the upper end of the connector base is provided with an annular groove; the lower end part of the rubber plug is sleeved in the annular groove; the bottom of the annular groove is provided with at least one air vent used for enabling the lower end part of the rubber plug to be communicated with the outside; a Luer connector with an inner pipe cavity is arranged at the lower end of the connector base; and one end, adjacent to the shell, of the inner pipe cavity of the Luer connector is provided with a diversion hole which is vertical to the axial direction and is used for enabling the inner pipe cavity of the Luer connector to be communicated with the hollow inner cavity of the shell. The positive-pressure needle-free connecting piece has the characteristics of improving the transfusion flow speed, being simple in structure, facilitating production and manufacture, lowering the production cost and the like.

Description

technical field [0001] The invention belongs to the field of infusion equipment, and in particular relates to a positive pressure needle-free connector. Background technique [0002] Positive pressure connector is a needle-free and airtight infusion connector. Because it generates positive pressure when the syringe or infusion tube is pulled out, it has the advantages of simple operation, avoiding needle stick injury, effectively reducing the occurrence of blood return and blocking the tube, and prolonging the time of tube insertion. Commonly used to connect intravenous catheters. Chinese patent CN101879339B discloses a positive pressure connector for needle-free drug dosing. The opening of the rubber stopper is activated through the Luer connector, so as to realize the liquid flow in a single direction, so as to avoid the pollution of particles and micro-dust that may be caused by needle puncture. When the syringe is pulled out, the positive pressure joint will generate a ...

AI Technical Summary

Problems solved by technology

However, the cross-section of the upper cover in the above patent is circular. In order to increase the gap between the inner wall of the upper cover and the rubber plug to increase the flow rate, the inner wall of the upper cover is provided with a diversion groove. However, in practical applications, such as conveying The liquid contains macromolecular tissue structures, such as blood, and the setting of the diversion groove is easy to scratch blood cells, thus affecting the efficacy of infusion

At the same time, the setting of the diversion groove will also form a dead angle on the inner wall of the upper cover, resulting in drug residues and affecting the accuracy of drug dosage

Since the cross-section of the upper cover is circular, in order to facilitate assembly, an anti-slip structure is provided on the outer wall of the upper cover, which increases the difficulty of manufacturing molds and high production costs

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