| 摘要 |
A plunger having an oblong body with a front end and a rear end and a lancet having a cutting edge projecting axially from said body at the front end is insertable in a cylinder having an oblong hollow body with a front end, a rear end and an axial hole. The plunger of such a length and the lancet is so arranged that it protrudes a predetermined distance out of the cylinder at the front end when the plunger is inserted thereby defining an operative cutting position. The plunger and cylinder have first engaging stop means arranged after partial insertion of the plunger, to temporarily prevent continued insertion at a predetermined initial position. The arresting function of the stop means is overcome by applying pressure on the plunger thereby pushing it the remaining distance into the cylinder from the initial position to the operative position. The lancet has a single cutting edge extending transversely to the axis of the lancet and a pair of identical inclined surfaces uniformly disposed about the cutting edge.
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