| 摘要 |
An improved safe and convenient disposable automatic blood collection needle comprises a housing (1), a needle core (2), a spring (3) and a protective rod (4), and is characterized in that: a press arm of a triggering button (10) is partitioned into a first press pin (11) and a second press pin (19); the first press pin (11) is used for triggering an elastic arm in a locking structure to form a press-type triggering structure; the second press pin (19) fits a safety sleeve (20) and a press-down channel (17) so as to achieve a safety function of the triggering button (10), and a barb (12) on the second press pin (19) fits a self-locking hook (13) on the housing (1) so as to achieve a self-locking function after one press. In order to shorten the needle exposure length of a needle body on the needle core, in the automatic blood collection needle, the distance between the second press pin (19) and the needle point (7) is designed to be less than the distance between the first press pin (11) and the needle point (7); the needle exposure length depends on the position of the safety sleeve (20), so the needle exposure length is shortened, thereby enhancing the puncture performance, and enabling the design of the blood collection needle to be more reasonable and practical. |
