| 摘要 |
A lancet has a needle (2) embedded in a plastics body (1), its tip (3) projecting from the forward end but being initially encased in a cap (4). This cap (4) is integrally moulded with the body, around the needle tip (3), and can be sheared away before use. The needle (2) can be pushed back in relation to the body (1) after use, conveniently by applying the cap (4) to the tip (3), until the tip is safely flush with, or set back with respect to, the leading end of the body (1). The rear end of the body (1) has a structure (9) to prevent the rear end of the needle (2) being pushed forwards again. To ensure that the tip disappears, the body (1) is formed with an intermediate, resiliently flexible bridge (17) stiff enough to remain rigid during pricking. But when the needle (2) is forced back and pressure is also applied to the part (18) of the body forward of the bridge (17), the needle (2) and that forward part (18) move back with respect to the rear part (19) of the body (1). Then the forward part (18) is released to move forwards, sprung by the bridge (17), leaving the needle (2) held by the rear part (19). <IMAGE> |
