Closed type detaining needle catheter assembly

Abstract

The invention relates to a device for introducing a medium into a body, in particular to a closed type detaining needle catheter assembly comprising a needle tube, a catheter, a catheter holder and an extending tube joint, wherein the needle tube penetrates through a catheter cavity through a centre shaft of an inner cavity of the catheter holder, and an annular gap cavity is formed between the needle tube and the catheter. The closed type detaining needle catheter assembly is structurally characterized by also comprising an exhaust guide hole, and the exhaust guide hole is arranged on the front end of the catheter holder and communicated with a blood return cavity. The invention has the advantages that the inventor provides the closed type detaining needle catheter assembly capable of enabling transfusion to be fast and convenient by overcoming the technical prejudice of the field; the exhaust guide hole communicated with the blood return cavity is arranged on the front end part of the catheter holder and communicated with an extending tube with an infusion tube during infusion, a gas inside the catheter assembly is fast exhausted to outside through the exhaust guide hole, and infusing fluid can fast enter the catheter assembly through the extending tube for the infusion simultaneously. The invention solves the problems of long-term inconvenient infusion and long waiting timeand provides powerful support for medical needle using demands against time.

Description

technical field [0001] The invention relates to a device for introducing a medium into the body, in particular to a closed indwelling needle catheter assembly. Background technique [0002] In the prior art, the closed indwelling needle catheter assembly includes a needle tube with a blood return groove at the front end, a transparent or translucent catheter, a catheter adapter, and an extension tube connector. One end of the catheter is connected to the catheter adapter, and the needle tube is inserted into the catheter cavity. In the center, there is a gap between the needle tube wall and the catheter, forming an annular cavity; the inner cavity of the catheter hub is hollow, and a blood return cavity is left at the front end, which is connected and communicated with the extension tube joint, and an isolation plug is installed at the rear end. The extension pipe joint and the blood return cavity communicate with the outside world through the passage formed by the annular c...

AI Technical Summary

Problems solved by technology

However, in the catheter assembly, the passage between the extension tube and the blood return chamber and the outside world is only an annular gap cavity, the passage is too small, the exhaust is slow, and there will be a dead exhaust angle in the blood return chamber, which affects the use of the closed indwelling needle

There is another structure of the closed indwelling needle, which uses a needle tube without a blood return groove. This kind of indwelling needle has a smaller exhaust channel, and the air outlet is almost sealed, which is more inconvenient to use.

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