A simple head pressing type disposable safety lancet

A simple head pressing type disposable safety lancet,

• comprising a housing, a needle core, a pusher and a launching spring, the direction pointed by needle tip of lancet defined as the front of the lancet;
• the front end of the needle core is equipped with a protective rod, and the side of the needle core is equipped with an elastic arm;
• the elastic arm is provided with a first blocking surface and a resisting surface, the pusher is provided with a second blocking surface corresponding to the first blocking surface, and the second blocking surface cooperates with the first blocking surface in restricting a forward movement of the needle core in relation to the pusher;
• a triggering surface is provided on the inner wall of the housing corresponding to the resisting surface, the triggering surface cooperating with the resisting surface to force the elastic arm to bend towards inner side;
• a first limiting surface is set on the outer side of the pusher, a locking bump is provided on the inner wall of the housing corresponding to the first limiting surface, and the locking bump cooperates with the first limiting surface to limit a forward movement of the pusher relative to the housing;
• a sliding platform is provided for the resisting surface on the inner wall of the housing, the front end face of the sliding platform is the triggering surface, and the tabletop of the sliding platform forms a sliding surface in a length direction of the lancet;
• the second blocking surface has a decoupling point that matches the first blocking surface on the elastic arm, and taken a needle body of the lancet as a center on a cross-section of the lancet, the distance between the decoupling point and the center is greater than or equal to the distance between the sliding surface and the center;
• obstructing surface, and a second limiting surface is set on the inner wall of the pusher corresponding to the obstructing surface, the second limiting surface cooperating with the obstructing surface on the stopper to limit a forward movement of the needle core relative to the pusher.