Forward press disposable safe blood taking needle

Abstract

The invention discloses a forwards pressed disposable safe blood taking needle, which comprises a shell, a slide sleeve, a needle core and a spring. The forwards pressed disposable safe blood taking needle is characterized in that: a first guide groove, a second guide groove and a first inclined face are formed on the inner wall of the shell; a guide rib, a slide groove and a second inclined faceare formed on the outer wall of the slide sleeve; a guide wing is arranged on the side part of the needle core; a third inclined face is arranged on the guide wing; the guide rib and the first guide groove are matched with each other to form axial slide connection; and the slide groove and the second guide groove are arranged in parallel to form an injection track. Before injection, reliable positioning support is provided for the needle core by means of a concave part formed by intersection between the second inclined face and the first inclined face and in the way that the third inclined face is adhered to the second inclined face to position the guide wing. In an injection process, with the axial sliding of the slide sleeve relative to the shell, the second inclined face pushes the needle core to compress the spring through the third inclined face, at the same time, the second inclined face also pushes the guide wing to climb along the first inclined face through the third inclinedface until the guide wing falls on the injection track after crossing over the highest point of the first inclined face, so a needle tip is ensured to punch at the center of a blood taking part.

Description

technical field [0001] The invention relates to the technical field of medical appliances, in particular to a front-pressure disposable safety blood collection needle. Background technique [0002] Disposable automatic safety blood collection needles are the mainstream trend in the development of medical appliances, and these blood collection needles have been continuously improved and developed for many years. Chinese patent CN201379576Y announced a utility model patent titled "Disposable Blood Collection Needle" and the patent number is 200920096338.6. The inner wall of the needle tube of this patent is provided with a chute for the needle body to slide. The front end of the chute has a positioning edge. One end of the needle body is connected with a spring. The end face corresponds to the wedge-shaped surface of the needle body. When the telescopic cap and the needle body are installed, they are located on the side of the positioning edge. When the telescopic cap is pres...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a front-pressure disposable safety blood collection needle, which aims to improve the positioning and launch mechanism of the designed needle core, and solve the problems of unreliable positioning of the needle core and easy deviation from the center of the launch

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