Disposal puncture depth adjustable safety lancet

A disposable puncture-depth-adjustable safety lancet comprising:

• a shell fixed to at least two flexible claws that form a flexible clamp having an end with a hook;
• a lancet core configured to be held in the flexible clamp, the flexible clamp being configured to use the hook and a clamping force to clamp the lancet core in a locking state before triggering of the safety lancet;
• a spring configured to push against a tail of the lancet core in an ejecting direction of the lancet core;
• and
• a trigger having (i) a head that extends out of a front end of the shell, (ii) a body that is slideably connected to the shell, and (iii) a bevel configured to force the end of the flexible clamp to stretch in side directions corresponding to each of the at least two flexible claws, wherein, in an assembled state:
• a cylindrical-shaped adjusting ring is provided at the front end of the shell to adjust a puncture depth of a needle tip;
• the adjusting ring is sleeved at an outside of the trigger head and is clearance fit with the trigger;
• an end face of the trigger head configured to contact skin extends out of a port at a front end of the adjusting ring;
• the adjusting ring and the shell are connected to form (i) a rotational connection in a peripheral direction of the lancet core and (ii) a fixed connection in an axial direction of the lancet core;
• a rotational locating structure is formed by the adjusting ring and the shell in a peripheral direction of the shell;
• the adjusting ring has an inner wall with an inner end face that (i) faces a rear end direction of the adjusting ring and (ii) is a rotating step face or rotating bevel;
• the lancet core has a side wing positioned relative to the rotating step face or rotating bevel, and an end face of the side wing facing the rotating step face or rotating bevel is a collision face;
• the trigger has a guide slot that is positioned relative to the side wing, the guide slot being provided with an opening at the outside of the trigger head so that the collision face can move toward the rotating step face or rotating bevel through the opening during ejection of the lancet core;
• rotating the adjusting ring locates the adjusting ring in different locating positions in the peripheral direction of the shell;
• and
• the rotating step face or rotating bevel is configured to meet the collision face of the lancet core at-different axial positions, thereby changing the puncture depth of the needle tip.