An improved disposal puncture depth adjustable safety lancet

An improved disposable puncture depth adjustable safety lancet consists of a shell, a lancet core, a spring and a trigger. The shell is fixedly at least two flexible claws and all flexible claws form a flexible clamp. The lancet core is held in the flexible clamp and the spring pushes the tail of lancet core and acts on the ejecting direction of lancet core. The flexible clamp uses the hook at the end and clamping force to clamp the lancet core to be in locking state before triggering. The head of trigger extends out of the front end of shell;

• the body of trigger is slideably connected in the shell;
• and the trigger is equipped with the bevel forcing the end of flexible clamp to stretch to the side direction in relative to the flexible claw;
• wherein:
• under the assembly state, the shell is provided with an adjusting ring to adjust the puncture depth in the front end, and the adjusting ring is a cylindrical-shape component;
• the adjusting ring is sleeved at the outside of the trigger head and its clearance fit with the trigger, and the end face of the trigger head to contact the skin is exposed out of the port at the front end of the adjusting ring;
• the adjusting ring and the shell are connected in a rotational way in the peripheral direction of the lancet core, and the adjusting ring and the shell are connected in a fixed way in the axial direction of the lancet core, and a rotational locating structure is set between the adjusting ring and the shell in the rotation direction. The adjusting ring is provided with the inner end face on the inner wall, and the inner end face faces the rear end direction of adjusting ring, and the inner end face is the rotating step face or rotating bevel, and the lancet core is provided with the side wing in relative to the rotating step face or rotating bevel, the end face of side wing facing the rotating step face or rotating bevel is the collision face, and the trigger is provided with the guide slot in relative to the side wing, and the guide slot is provided with an opening at the outside of trigger head, so that the collision face could rush to the rotating step face or rotating bevel through the opening during the ejection of lancet core;
• the rotation of adjusting ring could locate the adjusting ring in different locating positions at the peripheral direction of the shell, and the rotating step face or rotating bevel meets the collision face of lancet core in the different axial positions, thereby changing the puncture depth of needle tip.