Lancet for blood collection and puncture needle unit

A lancet for puncturing a human body with a puncture needle to collect bodily fluids from the human body, the lancet comprising:

• a slider that is able to hold a puncture needle at one end, and is reversibly slidable in a linear direction to carry out a puncture operation using the puncture needle;
• a link mechanism having one end coupled to another end of the slider;
• a flywheel rotatably mounted with respect to the link mechanism, and coupled to the link mechanism using a rotation knot shaft implanted therein as a shaft on another end of the link mechanism;
• an elastic force application member for applying a rotation force in a predetermined direction to the flywheel causing the flywheel to rotate in a first direction and causing the link mechanism coupled to the flywheel to slide the slider in a puncture direction to carry out the puncture operation;
• a stopper arm for stopping the rotation of the flywheel caused by the rotation force applied by the elastic force application member and for releasing the stopping of the rotation of the flywheel to carry out the puncture operation;
• a set lever mechanism engaged with a wheel set pin of the flywheel and for rotating the flywheel only in the first direction to set the slider in a puncture-ready position;
• and
• an anti-reverse-rotation mechanism that prevents a reverse rotation, which is opposite to the first direction of rotation, of the flywheel after the puncture operation has been carried out to prevent the slider from sliding in the puncture direction prior to the set lever mechanism setting the slider in the puncture-ready position and the stopper arm releasing the stopping of the rotation of the flywheel.