Lancing device, method of making lancing device, pump mechanism, and sucking device

A lancing device incorporating a vacuum generating mechanism, comprising:

• a housing;
• a moving body movable relatively to the housing for forward movement of a needle;
• a driving mechanism for forward movement of the moving body;
• a hollow pressing portion at a front end of the housing for contact with a part where a puncture is to be made;
• and a pump mechanism capable of causing a vacuum to act inside the pressing portion,
• wherein the pump mechanism is capable of adjusting the vacuum;
• and
• wherein the pump mechanism includes:
• a moving portion capable of reciprocating in a first direction and a second direction opposite to the first direction;
• a pressure chamber capable of communicating with an outside of the pressing portion via a discharge port and capable of communicating with an inside of the pressing portion via an intake port, the pressure chamber having a volumetric capacity varied by the reciprocation of the moving portion,
• a first check valve capable of opening and closing the discharge port, the first check valve opening the discharge port when the volumetric capacity of the pressure chamber decreases, and the first check valve closing the discharge port when the volumetric capacity of the pressure chamber increases, and
• a second check valve capable of opening and closing the intake port, the second check valve opening the intake port when the volumetric capacity of the pressure chamber increases, and the second check valve closing the intake port when the volumetric capacity of the pressure chamber decreases.