Retention needle tube assembly

Abstract

The invention relates to an instrument for introducing medium into bodies, particularly a retention needle tube assembly which comprises a connecting component, a retractable protective sleeve, a needle stand and a needle tube. The retention needle tube assembly is structurally characterized by also comprising an extension spring, wherein the retractable protective sleeve is enclosed in the innercavity of the needle stand after being compressed; and the connecting component, is connected with the needle stand through a buckling device. The invention has the technical characteristics that theextension spring is arranged in the retention pin with the retractable protective sleeve; and in the piercing process, the needle stand and the retractable protective sleeve are unfolded under the action of the spring, the needle tube retreats from the guide tube along with the needle stand and finally leaves the guide tube assembly to enter the retractable protective sleeve, and meanwhile, the connecting component, is held by a hand so as to feed the guide tube into deep inside vessels. In the piercing process, the needle point is no longer exposed outside the port of the guide tube, so thatthe needle point can not hurt the vessel when feeding the tube, thereby preventing angitis from generation. As for the medical care operators, the operation success rate is high; and as for the patients, injury and pain from piercing again can be prevented.

Description

technical field [0001] The invention relates to a device for introducing a medium into the body, in particular to an indwelling needle tube assembly. Background technique [0002] In the prior art, there is an indwelling needle with a retractable protective sheath that can prevent stab wounds. For details, please refer to Chinese patent ZL200920139686.7. This kind of indwelling needle includes a catheter assembly and a needle tube assembly. The catheter assembly includes a flexible catheter, a catheter hub connected to one end of the catheter, and a handle connected to the catheter hub. Protective sheath and hub with rigid puncture needle. Before use, the puncture needle tube is inserted into the catheter, and the needle tip is exposed, and the protective sleeve is in a compressed state, and is movably connected with the catheter base. When in use, first puncture the puncture needle tube with the catheter into the blood vessel through one-handed operation, and apply force ...

AI Technical Summary

Problems solved by technology

[0003] The disadvantages of the above indwelling needles are: 1. After the puncture, the protective sheath needs to be fully stretched to include the puncture needle tube in its protective sheath. When fully stretched, the catheter assembly is withdrawn, resulting in the puncture needle tip still being exposed, at this time the protective cover loses its containment effect on the needle tube, prone to needle tip injury accidents, resulting in medical problems

2. After the puncture needle tube is

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