A kind of dovetail groove oblique block needle for skin pricking experiment

Abstract

The invention discloses a dovetail-groove oblique block needle for a skin prick test, comprising a needle head, a needle seat, an oblique plane push rod and a housing; a transverse hole and a vertical hole which form a certain angle mutually and are communicated with each other are formed in the housing; the needle seat is arranged in the vertical hole; the oblique plane push rod is arranged in the transverse hole; an oblique plane is provided at the tail of the needle seat; a dovetail groove is formed in the oblique plane; the dovetail groove is matched with a bulge of the oblique plane push rod, so that the bulge can only slide in the dovetail groove; the oblique plane push rod is moved in the transverse hole, so that the needle seat can be moved in the vertical hole; the tail of the oblique plane push rod is stretched out from the housing and is provided with a push plate; a coarse spring is arranged between the push plate and the housing, so that the coarse spring can be compressed by pushing the push plate and can be rebounded automatically after the push plate is released.

Description

technical field [0001] The invention relates to a needle, in particular to a dovetail groove inclined block 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 fals...

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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