Blood drawing pen with needle withdrawing function and assembling method

Abstract

The invention discloses a blood drawing pen with a needle withdrawing function and an assembling method. The blood drawing pen mainly comprises a pen loop, a percussion needle withdrawing structure, ablood drawing needle, a tail cap and a pen cap. A guide sleeve is inserted into the pen loop. A limiting structure for controlling the advancing distance of an inner core is arranged in the guide sleeve. The inner core comprises a needle seat part for fixing the blood drawing needle, and the tail end of the needle seat part is connected with an inner core arm for being sleeved with an elastic part. A needle withdrawing key is arranged in the pen loop. The needle withdrawing inner core is in an L shape, and comprises a second convex rib and a hanging table limited between a first clamping table and a second clamping table. The elastic part comprises a transmitting spring, a first reset spring and a second reset spring with which the inner core arm is sleeved. When needle withdrawing is carried out after blood drawing, the percussion needle withdrawing structure is arranged in the blood drawing pen, the tail cap arranged at the rear end of the blood drawing pen pushes the percussion needle withdrawing structure to advance, thus, the blood drawing needle is pushed to be separated from the needle seat part, blood drawing and needle withdrawing processes are continuous, and potential safety hazards are effectively avoided.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a needle-retractable blood collection pen and an assembly method thereof. Background technique [0002] The blood collection pen is a pen-shaped blood collection device that is used in conjunction with a disposable sterile blood collection needle to collect peripheral blood samples from the human body and is a manual ejection auxiliary blood collection device. After the blood collection is completed, since the needle has been adhered with human blood, the used needle must be disposed of to prevent medical staff or other people from being stabbed by the needle. Many of the existing blood collection pens do not have the function of withdrawing the needle. It is very inconvenient to remove the blood collection needle after use and may even accidentally injure the operator. Some blood collection pens have the function of withdrawing the needle, but the operation is cumbersome...

AI Technical Summary

Problems solved by technology

Many of the existing blood collection pens do not have the function of withdrawing the needle. It is very inconvenient to remove the blood collection needle after use and may even accidentally injure the operator. Some blood collection pens have the function of withdrawing the needle, but the operation is more cumbersome

[0003] The needle withdrawal method usually used in the existing blood collection pen is to set the needle withdrawal key on the side, which requires both hands to operate or the needle withdrawal key is small due to structural limitations, which is not easy for the operator to hold

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