Lancing device utilizing tail handle to load and adjust depth

1 . A lancing device utilizing a tail handle to load and adjust depth, comprising a shell, an ejection pin, and a tail handle;

the shell is a pen shell structure of the lancing device, an ejection chamber is arranged inside the shell, and a lancing end face is provided at the front end of the shell;

the ejection pin is an ejection component capable of installing a lancet, the ejection pin is located in the ejection chamber, an active impact surface is set at the rear of the ejection pin to adjust puncture depth, and the active impact surface is facing towards the front of the lancing device;

the tail handle is a handle set at the tail of the lancing device to drive the ejection pin to be loaded;

wherein the tail handle is sleeved and connected relative to the shell, the tail handle is configured to rotate relative to the shell in a circumferential direction of the lancing device, and the tail handle is configured to slide relative to the shell in an axial direction of the lancing device at the same time;

between the tail handle and the shell, one of the tail handle and the shell is equipped with an axial limit surface, the other of the tail handle and the shell is equipped with a limit action part, and the axial limit surface is configured to contact the limit action part to limit the position of the tail handle relative to the shell to slide forward in an axial direction;

a passive impact surface is arranged corresponding to the active impact surface for both adjusting puncture depth and loading, the passive impact surface is directly or indirectly formed by a spiral action surface on the tail handle, rotating the tail handle is configured to change the position of the impact point on the passive impact surface in the axial direction of the lancing device;

in a use state, when the tail handle is rotated, the tail handle drives the position of the impact point on the passive impact surface to change in the axial direction of the lancing device, thereby changing the distance between the lancing end face and the impact point on the passive impact surface in the axial direction of the lancing device, thereby adjusting the lancet tip puncture depth;

when the tail handle is pulled backward, the tail handle forces the passive impact surface to contact the active impact surface at the rear of the ejection pin, and drives the ejection pin to move backward relative to the shell, until the ejection pin is loaded and locked;

the tail handle is designed to form a composite mating section with a housing of the shell, and at the composite mating section, one of the tail handle and the housing is provided with a plurality of guide grooves, and the other of the tail handle and the housing is provided with a guide block;

a length direction of the plurality of guide grooves is parallel to the axial direction of the lancing device, each guide groove of the plurality of guide grooves is spaced apart from each other along the circumferential direction of the lancing device;

at the composite mating section, the guide block and the plurality of guide grooves are configured to have a non-mating working state and a mating working state;

in the non-mating working state, the guide block and the plurality of guide grooves are staggered in the axial direction of the lancing device, such that the tail handle rotates relative to the housing in the circumferential direction of the landing device, and

in the mating working state, the guide block and the plurality of guide grooves overlap each other in the axial direction of the lancing device, such that the tail handle slides relative to the housing in the axial direction of the lancing device.

2 . The lancing device according to claim 1 , wherein the passive impact surface is directly formed by the spiral action surface on the tail handle, and

a sleeve structure is arranged on the tail handle, the sleeve structure is provided with an inner end face which is facing towards the rear of the lancing device, and the spiral action surface is a spiral step surface or a spiral surface or an inclined surface, the spiral step surface or spiral surface or inclined surface is directly arranged on the inner end face of the sleeve structure of the tail handle.

3 . The lancing device according to claim 2 , wherein the sleeve structure of the tail handle is composed of an outer sleeve and an inner sleeve; in an assembly state, the inner sleeve is fixed on the inner side of the front end of the outer sleeve, and the spiral step surface or spiral surface or inclined surface is directly arranged on the end face of the inner sleeve which is facing the rear of the lancing device.

4 . The lancing device according to claim 3 , wherein the outer edge of the inner sleeve is equipped with a positioning boss, and a positioning groove is arranged on the inner edge of the outer sleeve corresponding to the position of the positioning boss;

in the assembly state, the positioning boss on the inner sleeve fits with the positioning groove on the outer sleeve, to limit free degree of circumferential rotation of the inner sleeve relative to the outer sleeve;

the outer edge of the inner sleeve is equipped with a positioning convex rib, the positioning convex rib is perpendicular or at an angle to the axis of the lancing device; the inner edge of the outer sleeve is equipped with a positioning snap corresponding to the positioning convex rib;

in the assembly state, the positioning convex rib on the inner sleeve fits with the positioning snap on the outer sleeve, to limit free degree of axial movement of the inner sleeve relative to the outer sleeve.

5 . The lancing device according to claim 1 , wherein the passive impact surface is indirectly formed by the spiral action surface on the tail handle,

a sliding sleeve is provided for the tail handle, the sliding sleeve is positioned and connected relative to the shell in a circumferential direction of the lancing device, and the sliding sleeve is connected in an axial direction of the lancing device at the same time;

the tail handle is connected to the sliding sleeve through a screw pair, constituting a sliding sleeve axial movement mechanism which is adjusted by the rotation of the tail handle;

the passive impact surface is the inner end face of the sliding sleeve, and the spiral action surface is the screw pair.

6 . The lancing device according to claim 5 , wherein the screw pair is formed by the cooperation of a spiral groove and a driving block;

between the spiral groove and the driving block, one of the spiral groove and the driving block is located on the tail handle, and the other of the spiral groove and the driving block is located on the sliding sleeve.

7 . The lancing device according to claim 5 , wherein the screw pair is formed by the cooperation of an external thread and an internal thread;

between the external thread and the internal thread, one of the external thread and the internal thread is located on the tail handle, and the other of the external thread and the internal thread is located on the sliding sleeve.

8 . The lancing device according to claim 1 , wherein a return spring is provided for the tail handle, and the return spring acts on the return direction of the tail handle;

in the initial assembly state, under an action of the return spring, the axial limit surface between the tail handle and the shell is configured to contact the limit action part, placing the tail handle in a front limit position relative to the shell;

after pulling the tail handle backward for loading, releasing the tail handle and under the elastic force of the return spring, the tail handle moves axially forward relative to the shell, and stops until the tail handle returns to the front limit position again.

9 . The lancing device according to claim 1 , wherein the tail handle is equipped with a rotating positioning structure in a circumferential direction of the lancing device relative to the shell, the rotating positioning structure is composed of a rotating positioning groove and a rotating positioning block in coordination;

between the rotating positioning groove and the rotating positioning block, one of the rotating positioning groove and the rotating positioning block is located on the tail handle, and the other of the rotating positioning groove and the rotating positioning block is located on the shell or on a component fixedly connected to the shell, wherein, the length direction of the rotating positioning groove is parallel to the axis of the lancing device, and the rotating positioning groove is disposed at an interval in the circumferential direction of the lancing device.