Retraction type blood sampling device

Abstract

The invention relates to a retraction type blood sampling device. The retraction type blood sampling device comprises a needle tube shell and a pressing cap, a cylindrical cam, a unilateral bearing, a first spring, an upper end face cam, a lower end face cam, a central shaft, a guide sleeve, a second spring and a blood sampling needle which are arranged in the needle tube. The retraction type blood sampling device can quickly and instantly puncture in a puncture process and then can quickly retract after the puncture; the instant puncture can greatly relieve the pain feel of the user; the user even has no feel after the ending of the puncture, so that the psychological burden of the user can be greatly relieved; the principle of double-spring double damping vibration is adopted in the device; in a one-time pressing process, the needle cannot pop out for puncturing the skin after the needle quickly punctures deep into the skin, so that high speed for puncture is maintained while secondary injury caused by the high speed can be avoided; the unilateral bearing only allows the lower end face cam to unilaterally advance, so that the circulating reciprocating action can be performed all the time in the pressing process; after pressing and puncturing, the device can automatically reset, so that a large amount of time can be saved.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a retractable blood collection device. Background technique [0002] Blood collection needles are one of the most commonly used medical devices in hospitals when taking blood samples. However, it is worth noting that there are millions of human accidents caused by broken needles or improper operation of medical staff in hospitals around the world every year. Therefore, it is urgent to need a safe and convenient blood collection needle, but some blood collection needles on the market are either not easy to operate, or the safety performance is not up to standard. The existing blood collection needle mainly slides the needle core with the needle body in a housing, the inner wall of the front part of the housing is provided with a conical surface or an inclined surface, the front end is provided with a pinhole, and the needle core is symmetrically and obliquely provided with...

AI Technical Summary

Problems solved by technology

The blood collection pen includes a shell and a locking shooting structure with a firing rod. Because the needle tip of this mechanism is extended in the firing mode, it is easy to penetrate too deep because of the inertia of the needle tip, which is easy to cause harm to the human body.

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