Patent ID: 8372104

Claim:
A lancet for puncturing a human body to collect bodily fluids from the human body, comprising: a puncture needle; a slider which is able to hold said puncture needle at one end, and is reversibly slidable in a linear direction so that a puncture operation by said puncture needle is carried out; a cam ring which is flat-shaped and rotatable about an axis thereof, has a cam groove that is engaged with a cam follower provided on the slider within a rotation plane of the cam ring, and slides the slider by the rotation of the cam ring; an elastic force application member for applying a rotation force in a predetermined direction to the cam ring to slide the slider in a puncture direction; a stopper arm for stopping the rotation of the cam ring to which a force is applied by the elastic force application member, or releasing the stopping; and an anti-reverse-rotation mechanism which is implemented by a ratchet mechanism for preventing reverse rotation of the cam ring after the puncture operation.