needleless connector

Abstract

The invention discloses a needle-free joint which comprises a shell with a cavity, a plunger, an elastic element and a liquid outlet pipe. A liquid inlet pipe is arranged at the upper end of the shell, a through hole is formed in the side wall of the shell, the plunger can move between a first position and a second position in the cavity of the shell and is provided with a through hole, a first radial through hole is formed in the side wall of the plunger, the elastic element comprises an inserting-connecting portion, a wrapping portion and a fixed ring portion, the inserting-connecting portion is inserted into an axial through hole of the plunger, the section of the wrapping portion is U-shaped, the wrapping portion is composed of an inner ring, an outer ring and a bottom ring which encircle to form an annular groove containing the bottom of the plunger, the fixed ring portion is in sealed connection with the inner wall of the shell, a second radial through hole is formed in the fixed ring portion, and the liquid outlet pipe is arranged on the side face of the shell and communicated with the through hole in the side wall of the shell. Positive pressure to push liquid medicine in the shell to the liquid outlet pipe is generated when the needle-free joint is closed, so that backflow of the liquid medicine is prevented. In addition, the positive pressure can be changed by changing the sizes of the plunger and the elastic element.

Description

technical field [0001] The invention relates to a needle-free joint that is clinically used in conjunction with an infusion catheter and a syringe, and can prevent backflow of medicinal liquid and blood return. Background technique [0002] At present, when long-term repeated infusion or injection is required in the course of intravenous infusion therapy, intravenous indwelling needles or indwelling catheters are often used. These intravenous indwelling needles or indwelling catheters are usually connected to a three-way catheter, and the three-way catheter is usually equipped with a standard Luer (Luer) connector or a heparin cap to meet the clinical requirements of various infusions. However, the above-mentioned medical devices have certain defects in clinical use: the use of the Luer connector on the three-way tube requires local disinfection every time, and the use of injection needles for puncture, which increases the workload and operational risks for medical care. Th...

AI Technical Summary

Problems solved by technology

However, the above-mentioned medical devices have certain defects in clinical use: the use of the Luer connector on the three-way tube requires local disinfection every time, and the use of injection needles for puncture, which increases the workload and operational risks for medical care. The use of heparin caps requires medical personnel to inject heparin or normal saline into the heparin caps to seal the tube after filling the liquid medicine to prevent blood coagulation from forming thrombus, which also brings a burden to clinical operations

In addition, the application of the heparin cap may also cause a small amount of air to enter the blood circulation system, posing a risk

[0003] At the same time, neither of the above two devices can solve the problem that after the infusion is completed, the blood of the human body flows back into the indwelling hose due to the negative pressure generated when the injection needle or the needleless connector is withdrawn, and the blood coagulates to block the needle tube and prevent the next infusion. serious safety hazard

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