| 摘要 |
A skin pricker has an elongate housing containing a spring-loaded lancet which, when released from a rearward, cocked position by a trigger, shoots forward momentarily to project the tip of its needle through one end of the housing. The lancet is then prevented by a spring ratchet from being returned again to the cocked position. The cocking can be done through a twist-and-pull cap initially covering the needle tip and extending through that one end of the housing, the user pushing the cap to retract the lancet from its initial position. To guard against the lancet being prematurely pulled forwards by the cap and being trapped against cocking by the ratchet, the lancet has a formation that will engage a part of the trigger. |
