Novel pen type indwelling needle

Abstract

The invention relates to a novel pen type indwelling needle. An elastic shaft is arranged in a thimble seat so that the thimble seat can be sealed automatically when the indwelling needle is pulled out and highly difficult operation that the head end of a thimble of a traditional pen type indwelling needle must be pressed manually before needle pulling to avoid backflow of blood is avoided; due to the extensibility of the elastic shaft, the thimble seat can be directly matched with an infusion conical head, arrangement of an additional infusion pipe like a y-type indwelling needle is needless, and blood return, caused by extrusion of the additionally arranged infusion pipe, of y-type indwelling needle is avoided. In a word, the novel pen type indwelling needle is simple in structure and convenient to produce, has the advantages of the pen type indwelling needle and the y-type indwelling needle, can avoid the disadvantages of the pen type indwelling needle and the y-type indwelling needle, and additionally has the performance of positive-pressure pipe sealing.

Description

technical field [0001] The invention relates to a medical product, in particular to a novel pen-type indwelling needle. Background technique [0002] There are two types of indwelling needles: pen type and y type. [0003] The structure of the pen-type indwelling needle is simple, but when the puncture is completed and the needle tube is pulled out, the inner cavity of the cannula seat is directly connected to the atmosphere because the needle tube and the needle seat are pulled out from the inside of the cannula and cannula seat, resulting in blood return and contamination, so it is required to remove the needle tube The head end of the cannula must be pressed by hand beforehand. Since the head end of the cannula is located in the blood vessel, the operation is very difficult. Either the head end of the cannula cannot be pressed and blood returns, or the pressure is too heavy, causing the needle tube to scratch the blood vessel. [0004] The y-shaped indwelling needle solv...

AI Technical Summary

Problems solved by technology

However, due to the obstruction of the elastic plug, the cannula seat cannot be used as an infusion port, and an additional infusion line must be added to form a y-shaped trident structure

In addition to the complex structure of the y-shaped indwelling needle, there is also a fatal flaw. Once the tube is sealed, the newly added infusion line is vulnerable to various squeezes. Afterwards, the blood flows back into the cannula, forming a thrombotic blockage, which leads to the scrapping of the indwelling needle

The current popular positive pressure joint technology can only ensure that there is no blood return in the casing at the time of sealing, and it cannot prevent subsequent blood return due to extrusion of the pipeline at all.

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