Needle head assembly for detaining needle

Abstract

The invention provides a needle head assembly for a detaining needle. The needle head assembly comprises a guide pipe assembly and a steel needle assembly. The steel needle assembly comprises a steelneedle and a needle handle. The guide pipe assembly comprises a guide pipe seat. The front end of the guide pipe seat is provided with a detaining guide pipe for packaging a steel needle. The guide pipe seat is internally provided with an isolating plug. The needle hole at the back part of the steel needle gradually contracts from front to back. The needle handle is provided with a mounting hole for facilitating steel needle fixation. The needle handle at the back side of the mounting hole is provided with a sol trough. The back end of the steel needle passes through the mounting hole and is fixed in the sol trough in an airtight manner. The needle head assembly has advantages of simple structure, high safety and high practicability. Through contracting and sealing glue processing of the back part of the steel needle, steel needle jam caused by entry of glue into the inner part of the steel needle is effectively prevented; and normal clinical use is ensured.

Description

technical field [0001] The invention relates to a transfusion medical device, in particular to a needle assembly for an indwelling needle. Background technique [0002] The indwelling needle is a commonly used infusion device for clinical care and treatment. It is inserted into the peripheral vascular and venous system of the human body through the needle tip to form an infusion channel. In venous blood vessels, the catheter can stay in the vein for a long time, and it is not easy to puncture the blood vessel wall. [0003] At present, in the production process of catheters used by domestic indwelling needle manufacturers, because the length of the catheter is not easy to control, the error is relatively large, so the length of the steel needle assembly must be adjusted according to the length of the catheter. The adjustment method is to insert the steel needle into the needle seat The port at one end pushes the steel needle to move in the catheter to achieve the purpose of...

AI Technical Summary

Problems solved by technology

[0003] At present, in the production process of catheters used by domestic indwelling needle manufacturers, because the length of the catheter is not easy to control, the error is relatively large, so the length of the steel needle assembly must be adjusted according to the length of the catheter. The adjustment method is to insert the steel needle into the needle seat The port at one end pushes the steel needle to move in the catheter to achieve the purpose of adjusting the length of the steel needle assembly. After the length of the steel needle assembly is determined, use glue to bond or use interference fit to fix the rear end of the steel needle on the needle handle; When using glue for bonding, if the inner hole diameter of the steel needle is relatively large or not closed, the glue will enter the inside of the steel needle, causing the needle tube to be blocked, making it unusable for clinical use; when using interference fit for fixing, if the inner hole diameter of the steel needle is relatively large or If it is not closed, blood will flow from the inner hole of the steel needle to the outside of the needle seat during clinical use, causing blood contamination

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