A double spring needle for skin pricking experiment

Abstract

The invention provides a skin prick test double-spring needle. The skin prick test double-spring needle comprises a needle head, a needle seat, a slope push rod and a shell. A transverse hole and a vertical hole which are formed at a certain angle and communicated with each other are formed in the shell. The needle seat is arranged in the vertical hole. The slope push rod is arranged in the transverse hole. A slope is arranged at the tail of the needle seat. A dovetail groove is formed in the slope and matched with a protrusion of the slope push rod, the protrusion can only slide in the dovetail groove, the slope push rod moves in the transverse hole to make the needle seat move in the vertical hole, the tail of the slope push rod stretches out of the shell and is provided with a push tray, a thick spring is arranged between the push tray and the shell, the thick spring can be compressed by pushing the push tray, and the thick spring can automatically rebound after the push tray is released.

Description

technical field [0001] The invention relates to a needle, in particular to a double spring needle for skin pricking experiments. Background technique [0002] The existing human skin allergy test mainly obtains the required data through the skin prick test. At present, the skin prick allergen is mainly used in clinical practice-disinfect the patient's bilateral forearms, and drop it on the inside of the forearm every 3-5cm. One drop of allergen drug solution (about 20 kinds), and dripped with histamine positive control and normal saline negative control, puncture the skin vertically with a disposable needle in the center of the drug solution to subcutaneous, observe for 20 minutes, and compare with histamine group and saline group Compare and record the location and size of the wheal. However, for operators, especially beginners, the depth of needle penetration is often uncertain, and the penetration is too shallow to pierce the skin, which may lead to false negative result...

AI Technical Summary

Problems solved by technology

However, for operators, especially beginners, the depth of needle penetration is often uncertain, and the penetration is too shallow to pierce the skin, which may lead to false negative results

If the penetration is too deep, the pain will be strong, and the penetration into the dermis will cause bleeding, which will affect the test results, so that the operator cannot let go during the operation, and the detection efficiency will be too slow

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