Split welding fixed disposable blood taking needle

Abstract

The invention discloses a split welding fixed disposable blood taking needle, which comprises a lower shell, an upper shell, a sliding needle block, a return spring and a needle tip cap, wherein the return spring is arranged on one end of the sliding needle block, the needle pin cap is arranged on the other end of the sliding needle block, an integer formed by connecting the sliding needle block and the return spring and the needle pin cap is arranged in an inner cavity of the lower shell, the upper shell and the lower shell are welded into a whole in a joint surface through the same material plastic-plastic ultrasonic wave connecting technology, thus the upper shell and the lower shell are more firmly connected into a whole. The split welding fixed disposable blood taking needle has the advantages of increasing the operating efficiency by 100 times to 150 times in comparison with manual assembly, being good in connecting quality, being smaller in welding deformation and residual stress due to no need of cooling curing time, increasing yield, ensuring quality from the structure, thus the production efficiency can be greatly increased, the labor cost is lowered, and the quality is improved.

Description

【Technical field】 [0001] The invention relates to a medical device, in particular to a disposable blood collection needle. 【Background technique】 [0002] There are many kinds of existing disposable blood collection needle products, for example, Chinese patents CN1011190129B and CN1961828B are two of them. These disposable blood collection needles have complex structures, poor production processability, and assembly is mainly carried out by hand. Included in these products are lower and upper shells with slideways, which must be die-cast and trimmed separately, then glued, aligned and bonded. There is no correlation between the upper shell and the lower shell, and there is no positioning structure for closing the cover. The two must be fixed together by glue bonding. In the traditional assembly production process, the upper shell and the lower shell The die-casting, alignment, gluing and bonding between them are completely manual, which not only complicates the operation, b...

AI Technical Summary

Problems solved by technology

There is no correlation between the upper shell and the lower shell, and there is no positioning structure for closing the cover. The two must be fixed together by glue bonding. In the traditional assembly production process, the upper shell and the lower shell The die-casting, alignment, gluing and bonding between them are completely manual, which not only complicates the operation, but also requires high technical requirements, and the alignment accuracy between the upper shell and the lower shell is not high, and it must take 5 minutes after gluing It takes about time to dry and solidify before pressing and bonding. If the glue is unevenly applied, too much or too little glue will affect the bonding strength, and it is difficult to improve production efficiency.

Through user return visits and tests, the applicant found that the structure of this type of blood collection needle is unreasonable, there is no positioning structure for easy assembly between the upper shell and the lower shell, and it is easy to merge and bond between the upper shell and the lower shell. Misplacement or dislocation occurs. At the same time, glue is used to bond the upper shell and the lower shell. Not only is the production efficiency low, the cost is high, and the assembly quality is difficult to guarantee

Gluing requires a lot of manpower, material resources and working hours. After the glue is applied, it takes a long time to wait for the glue to solidify. Usually, the number of manual assembly by one worker is only 2,000. The labor cost is too high and the production efficiency is too low.

In terms of the firmness of the connection between the upper shell and the lower shell, the firmness of the glue after solidification is not stable enough, and the strength is not high. The bonding strength will also be reduced accordingly, and the 5-year shelf life requirement cannot be met

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