Abstract: Disclosed is a replaceable blood lancet device in which a needle unit including a needle carrier and a front slider is used as inserted in a tubular barrel, and the used needle unit or needle carrier is replaced after use. The replaceable blood lancet device minimizes waste of resources by reducing the parts to be discarded in reuse. In addition, the front slider inserted in the barrel is easily loaded and unloaded through the withdrawal grip portion provided in the front slider. Further, an action spring for elastically pushing the needle carrier in a frontward direction, and a rear end cap for supporting the actuation spring to be compressed to generate an elastic force are provided, so that the blood lancet device can perform blood collection based on the elastic force of the spring.

Abstract: A disposable blood lancet device includes a barrel including a tubular barrel body; a tubular front slider inserted in the barrel; a carrier; a needle carrier; an actuation spring elastically pushing the needle carrier in the frontward direction; and a trigger portion coming into contact with the elastic transformation portion upon the rearward movement of the needle carrier and elastically transforming the elastic transformation portion inwards in the radial direction so that the interlocking holding projection can be separated inwards from the rear end of the front slider to propel the needle carrier frontwards.