Blood collection device with automatic triggering mechanism and assembling method thereof

Abstract

The invention provides a blood collection device with an automatic triggering mechanism and an assembling method thereof, the blood collection device comprises an outer cylinder, an inner cylinder and a needle seat with a boss, the lower end of the needle seat is provided with a needle body, and the lower end of the inner cylinder is provided with a through hole for the needle body to extend out; a trigger spring is supported at the upper end of the boss, a reset spring is supported at the lower end of the boss, the outer cylinder is in sliding fit with the inner cylinder, and the inner cylinder is provided with an elastic arm; the outer cylinder is sequentially provided with an extrusion section and a trigger section from bottom to top, and the inner diameter of the trigger section is larger than that of the extrusion section; and the elastic arm is located in the extrusion section of the outer cylinder, is in a pressed state and abuts against the lower end of the boss. Triggering is carried out through the change of the inner diameter of the outer cylinder, the structure is simple and reasonable, machining is convenient, product reliability is high, production cost is low, and popularization is facilitated.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a blood collection device with an automatic trigger mechanism and an assembly method thereof. Background technique [0002] Blood tests are widely practiced as an effective method for investigating diseases and as a method for health management. When measuring blood components, it is required to reliably collect the required blood, such as peripheral blood, which is usually done by using a blood collection device. When a traditional blood collection needle is used, after the needle tip is pierced into the skin, the depth, angle, and strength of the piercing need to be manually controlled, which has high requirements for the user. Another kind of blood collection needle used with the blood collection pen, after puncturing, the needle tip cannot be retracted and is exposed, which is prone to accidental puncture accidents and has potential safety hazards. [0003] As disclosed in Ch...

AI Technical Summary

Problems solved by technology

However, its trigger mechanism is composed of a sliding sleeve, a chute channel on the sliding sleeve, a needle body, a guide block on the needle body and other mechanisms, and its structure (especially the structure of the sliding sleeve) is complicated and fine, and has the following defects:

[0004] 1) The structure of related parts is complex and difficult to process. Once the size and orientation of the parts deviate, it will lead to the problem of product failure

[0005] 2) During assembly, in order to ensure that the components have the correct matching relationship, the installation direction of each component needs to be adjusted (especially structures such as guide rails and guide grooves need to be precisely aligned), the installation efficiency is low, and it is difficult to achieve automatic processing and assembly. Leading to high production costs, thus losing product competitiveness

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