| 摘要 |
An automatic safe disposable blood sampling device includes a casing with a launching chamber formed therein. The launching chamber has a lancet needle-exiting hole at a front end thereof; a lancet needle arranged inside the launching chamber; a spring; a launching mechanism composed of the spring and a catch-launching mechanism; a press-launching mechanism provided on the casing; and a self-locking mechanism composed of barbs provided on the press-launching mechanism and self-locking hooks or notches provided on the casing which engage corresponding barbs. When pressed, the press-launching mechanism triggers the catch-launching mechanism, to disengage the lancet needle from the casing. The spring pushes the lancet needle so as to launch the lancet needle. During forward movement of the press-launching mechanism, the barbs pass across the self-locking hooks or notches. In the process of retraction, the barbs are locked with the self-locking hooks or notches and cannot return to their initial states.
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