Blood drawing pen

Abstract

The invention discloses a blood drawing pen capable of rotatably returning a needle, which comprises a needle returning device, a hitting device and a depth regulating device, wherein the hitting device comprises a pen holder with an inner cavity and a needle rod capable of sliding in the inner cavity, one end of the hitting device is connected with the needle returning device used for applying apre-ejection force, and the other end of the hitting device is connected with the depth regulating device used for regulating the ejection depth. The blood drawing pen is characterized in that the needle returning device comprises a rotating member with an inner cavity and a transmission member capable of sliding in the inner cavity of the rotating member, one end of the needle rod is sleeved with an ejection spring which passes through the inner cavity of the pen holder and the inner cavity of the rotating member to be fixedly connected with the transmission member, wherein one end of the rotating member and the pen holder are connected and can rotate relatively, the other end of the rotating member is provided with an incline rail formed by adopting an incline, and the outer wall of thetransmission member is provided with a lug boss capable of sliding on the incline rail. The blood drawing pen is simple in operation; and parts of the whole blood drawing pen are connected in a convex and concave matching manner without gaps and exposed parts, and are easy to assemble, therefore, production cost is effectively lowered.

Description

technical field [0001] The invention relates to a medical appliance, in particular to a blood sampling pen which can adjust the puncture depth and rotate the needle back. Background technique [0002] The blood collection pen can be used to collect blood for diabetic patients to complete blood sugar monitoring, and can also be used for clinical blood collection for routine inspection. Most of the commercially available blood collection pens use the ejection principle of the spring to apply ejection force to the blood collection needle, thereby puncturing the skin to complete blood collection. [0003] When the commercially available blood collection pen is back-needling, generally a push-pull button is set on the body of the pen or a pull-out rod is set on the top, and the ejection force is applied to the needle head by pushing or pulling back the needle with external force. The specific operation is: The pen holder is connected with the blood collection needle, and it is a...

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of these blood collection pens is that the push-pull or pull-back method, or the adjustment of the ejection depth through the helical structure, will create gaps on the blood collection pen, which will cause the invasion and accumulation of dust and bacteria, and easily cause infection; the above-mentioned technical solutions Too many parts, complex assembly, difficult to maintain, and affect the appearance of the product;

[0006] Some commercially available blood collection pens are assembled by hot melting or welding, the production process is cumbersome and cannot be disassembled, and the production cost is too high

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