Painless vacuum blood collector

Abstract

The invention discloses a painless vacuum blood collector which comprises a cylinder, a needle ejecting assembly, a push rod assembly and a shell cover. The needle ejecting assembly comprises an ejecting rod and an ejecting base, wherein an ejecting elastic part and an ejecting rod reset elastic part are arranged on the ejecting rod. The push rod assembly comprises a push rod and a piston body, wherein a push rod reset elastic part is arranged on the push rod. Magnetic attraction assemblies are arranged between the rear end of the ejecting rod and the front end of the push rod assembly. The cylinder is provided with a clamping lock structure and a trigger button, wherein the clamping lock structure is capable of being interlocked with the piston body, and an air hole is formed in the trigger button. When the push rod is pushed forwards until the piston body and the cylinder are interlocked, the magnetic attraction assemblies between the front end of the push rod assembly and the rear end of the ejecting rod are in attraction connection; the trigger button is pressed continuously to release the clamping lock structure, the push rod moves backwards to drive the ejecting rod to move backwards through the magnetic attraction assemblies, when the ejecting rod moves backwards to the maximum backwards-moving position, the magnetic attraction assemblies are separated, and the ejecting rod ejects forwards quickly under the action of the ejecting elastic part and moves backwards to reset under the action of the ejecting rod reset elastic part.

Description

technical field [0001] The invention belongs to the technical field of medical micro blood collection devices, in particular to a painless vacuum blood collection device. Background technique [0002] Disposable blood collection device is a kind of medical equipment commonly used, is to utilize blood collection needle to puncture patient's finger or ear to take blood. At present, the blood collection equipment on the market will bring pain to the patient when used. This pain is caused by the slow insertion or withdrawal speed of the blood collection needle during the use of the blood collection equipment. When the speed of needle insertion is significantly lower than the transmission speed of the pain-sensing nerves of the human body to the brain, the peripheral nerves of the human body will successfully complete the whole process of a reflex arc transmitted to the brain, resulting in pain; Small relative movements are likely to occur between the patient's fingers or ears, ...

AI Technical Summary

Problems solved by technology

The above-mentioned compression spring is used as a tension spring, which consumes a lot of kinetic energy of the blood collection needle during the needle insertion process. Therefore, it will inevitably lead to a slow needle insertion speed of the blood collection needle, thereby causing pain to the patient.

[0004] In addition, there are certain safety defects in the existing blood collection device

That is, when inserting a disposable blood collection needle, the ejection member may enter the locked state before launch due to the insertion thrust, and the user may mistakenly touch the launch button to launch the blood collection needle, thereby causing harm to the user

At present, there are also some blood collection devices with safety settings, but this blood collection device has a complicated structure, is inconvenient to operate, and cannot observe and obtain the required blood collection volume

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