CN115804597A

CN115804597A - Blood sampling pen

Info

Publication number: CN115804597A
Application number: CN202210949990.8A
Authority: CN
Inventors: 张立波; 崔成哲
Original assignee: Tianjin Huahong Technology Co Ltd
Current assignee: Tianjin Huahong Technology Co Ltd
Priority date: 2021-08-09
Filing date: 2022-08-09
Publication date: 2023-03-17

Abstract

The embodiment of the invention provides a blood sampling pen, which comprises: a pen cap provided with a pen cap hole adapted to insert the blood collection needle; the inner wall of the shell is provided with a first limiting part; a needle core including a needle holder adapted to hold a blood collection needle inserted from the pen cap hole; withdraw the needle bar, wherein: the needle core also comprises a first elastic arm, when the needle withdrawing rod is positioned at the needle withdrawing position, the first elastic arm is driven to be positioned at a first radial position, and when the needle withdrawing rod is positioned at the needle loading position, the first elastic arm is driven to be positioned at a second radial position; the first elastic arm is suitable for abutting against the first limiting part when in a first radial position so as to prevent the needle core from moving towards the far end to a state to be launched and separating from the first limiting part when in a second radial position. On one hand, the blood taking needle can be directly installed into the needle base from the pen cap without disassembling and assembling the pen cap, and the using steps of the blood taking pen are simplified. On the other hand, when the blood taking needle is not mounted in place, the needle core cannot be loaded, so that the use safety is improved.

Description

Blood sampling pen

Technical Field

The invention relates to the field of medical instruments, in particular to a blood sampling pen.

Background

The blood sampling pen is a pen-shaped blood sampling device, and is matched with a disposable blood sampling needle for use to collect peripheral blood samples of a human body. The steps of using a conventional lancet generally include: screwing off a pen cap, loading a blood taking needle into a needle base, screwing off the needle cap, installing the pen cap, loading the blood taking pen and emitting for taking blood, screwing off the pen cap, penetrating a needle point of the blood taking needle into the needle cap, discarding the blood taking needle, and installing the pen cap. The use steps are complicated, and a novel blood sampling pen needs to be provided so as to simplify the use steps of the blood sampling pen. In addition, the existing blood sampling pen generally needs to be provided with an emission key and a needle withdrawing key separately, and the blood sampling pen has more parts and more complex structure.

In addition, the operation process of the blood sampling pen usually comprises needle loading, needle launching and needle withdrawing, and the steps are usually required to be executed in sequence, but if the user does not operate properly, for example, the needle withdrawing operation is executed after the needle loading and the needle loading, safety risks are brought.

In some existing blood sampling pens, the puncturing depth of a blood sampling needle can be adjusted by rotating a head cap of the blood sampling pen. Head cap one side is that the blood taking needle goes out one side of needle, and the user is at the in-process of rotating the head cap, for convenient looking over, will go out needle one side and aim at oneself usually, and like this, the security of operation is not good enough.

Disclosure of Invention

The present invention has been made to mitigate or solve at least one aspect or at least one point of the above-mentioned problems.

One embodiment of the present invention provides a blood collection pen including:

a pen cap provided with a pen cap hole adapted to insert the blood collection needle;

the inner wall of the shell is provided with a first limiting part;

a needle core including a needle holder adapted to hold a blood collection needle inserted from the pen cap hole;

the needle withdrawing rod is retracted to the position of the needle,

wherein:

the needle core further comprises a first elastic arm, the first elastic arm is driven to be located at a first radial position when the needle withdrawing rod is located at a needle withdrawing position, and the first elastic arm is driven to be located at a second radial position when the needle withdrawing rod is located at a needle installing position;

the first elastic arm is suitable for abutting against the first limiting part when in the first radial position so as to prevent the needle core from moving towards the far end to a state to be launched and separating from the first limiting part when in the second radial position.

Another embodiment of the present invention provides a lancet, including:

a housing;

a tail cap disposed at a distal end of the housing;

a tail cap inner core, at least a portion of which is disposed inside the tail cap;

a tail cap rotor disposed at a distal end of the tail cap and adapted to rotate relative to the tail cap;

wherein the rotation of the tail cap rotor is adapted to drive the tail cap inner core to move axially to adjust the lancing depth of the lancet.

Another embodiment of the present invention provides a lancet, including:

a tail cap which comprises a tail cap bullet wall extending along the axial direction of the blood sampling pen,

wherein: the tail cap bullet wall is provided with the transmission part, and the transmission part is suitable for triggering the blood sampling action of the blood sampling pen under the condition that the tail cap bullet wall is pressed.

Another embodiment of the present invention provides a lancet, including:

a needle core including a needle holder adapted to hold a blood collection needle;

withdrawing the needle rod;

wherein:

the stylet comprises a blocking part, the needle withdrawing rod comprises an elastic part, the blood taking needle is in a state of waiting to be launched, the blocking part is abutted against the elastic part to prevent the needle withdrawing rod from triggering the needle withdrawing action of the blood taking pen.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIGS. 1-3 are schematic structural views of a pen cap according to an exemplary embodiment of the present invention;

FIGS. 4-6 are schematic illustrations of the construction of one of the housings in an exemplary embodiment of the invention;

FIGS. 7-9 are schematic illustrations of the construction of one of the wicks in an exemplary embodiment of the invention;

FIGS. 10-11 are schematic views of a needle retraction lever in accordance with an exemplary embodiment of the present invention;

FIG. 12 is a schematic view of a first resilient arm abutting a first position-limiting portion according to an exemplary embodiment of the invention;

FIG. 13 is a schematic view of a first resilient arm being disengaged from a first position-limiting portion in an exemplary embodiment of the invention;

FIG. 14a is a schematic view of a portion of a lancet in an exemplary embodiment of the invention;

FIG. 14b is an enlarged view of a portion of a lancet in an exemplary embodiment of the invention;

FIG. 15 is a schematic view of a first guide structure in an exemplary embodiment of the invention;

FIGS. 16-18 are schematic structural views of a tail cap in an exemplary embodiment of the invention;

FIGS. 19-20 are schematic structural views of a tail cap inner core in an exemplary embodiment of the invention;

FIGS. 21-22 are schematic structural views of a tail cap rotor in an exemplary embodiment of the invention;

FIG. 23 is a schematic structural view of a lancet in an exemplary embodiment of the invention;

FIGS. 24-25 are schematic structural views of a needle withdraw key in an exemplary embodiment of the invention;

FIG. 26 is an exploded view of a lancet in an exemplary embodiment of the invention;

27a-27b are schematic views of the engagement of a stylet and a withdrawal rod in an exemplary embodiment of the invention;

FIG. 28 is a schematic structural view of a lancet in an un-needled and un-loaded state in accordance with an exemplary embodiment of the present invention;

FIGS. 29-30 are schematic views of a lancet pen of an exemplary embodiment of the present invention after insertion into the lancet;

FIG. 31 is a schematic view of a lancet with a lancet inserted therein and a cap twisted off in accordance with an exemplary embodiment of the present invention;

FIGS. 32-38 are schematic views of the lancet gun of an exemplary embodiment of the present invention during a loading motion;

FIGS. 39-41 are schematic views of a lancet in the process of performing a firing stroke in accordance with an exemplary embodiment of the present invention;

FIGS. 42-46 are schematic views of the lancet during the needle withdrawing action in an exemplary embodiment of the present invention;

FIG. 47 is a schematic view of a lancet pen with the second resilient arm omitted in an exemplary embodiment of the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived from the embodiments given herein by one of ordinary skill in the art, are within the scope of the invention.

In order to achieve the above object, an embodiment of the present invention provides a blood sampling pen, including: a pen cap 1, a shell 4, a needle core 2 and a needle withdrawing rod 3. Fig. 1-3 are schematic views showing a structure of a cap 1 according to an exemplary embodiment of the present invention, and as shown in fig. 1, the cap 1 is provided with a cap hole 104 adapted to insert a lancet 12. Fig. 4 to 6 are schematic structural views of a housing 4 according to an exemplary embodiment of the present invention, and as shown in fig. 5, a first position-limiting portion 409 is disposed on an inner wall of the housing 4. Fig. 7-9 are schematic views showing the construction of a cartridge 2 according to an exemplary embodiment of the present invention, and as shown in fig. 7, the cartridge 2 includes a hub 213 and a first elastic arm 212, the hub 213 being adapted to hold a lancet 12 inserted from a cap hole 104. Fig. 10-11 are schematic views of a needle withdrawing rod 3 according to an exemplary embodiment of the present invention.

As shown in fig. 12, when the needle withdrawing rod 3 is located at the needle withdrawing position, the first elastic arm 212 is driven to be located at the first radial position, and the first elastic arm 212 is adapted to abut against the first limiting portion 409 at the first radial position so as to prevent the core 2 from moving to the distal end to be launched state. As shown in fig. 13, when the needle withdrawing rod 3 is located at the needle installing position, the first elastic arm 212 is driven to be located at the second radial position; the first resilient arm 212 is further adapted to disengage the first stop portion 409 at the second radial position.

If the blood taking needle is not arranged in the needle base, or the blood taking needle does not completely fall off when the needle is withdrawn, the tail cap is pulled again to be loaded and launched, the needle core can push the blood taking needle to move towards the near end, and the blood taking needle can fly out from the pen cap hole 104 due to the fact that the blood taking needle is not fixed with the needle base, and injury is caused to personnel.

By applying the embodiment, the needle withdrawing rod 3 is located at the needle withdrawing position under the condition that the blood taking needle 12 is not installed in the needle seat 213 or the blood taking needle does not completely fall off during needle withdrawing, at this time, the needle withdrawing rod 3 drives the first elastic arm 212 to be located at the first radial position, and the first elastic arm 212 abuts against the first limiting part 409, so that the needle core 2 can be prevented from moving to the state to be launched towards the far end, that is, the needle core cannot be loaded under the condition that the blood taking needle is not installed in place, and therefore, the use safety is improved. When the blood taking needle 12 is mounted in the needle seat 213, the needle withdrawing rod 3 is located at the needle mounting position, at this time, the needle withdrawing rod 3 drives the first elastic arm 212 to be located at the second radial position, and the first elastic arm 212 is separated from the first limiting portion 409, that is, after the blood taking needle is mounted in place, the needle core can be loaded, so that the safety is improved, and the normal use is not influenced.

In an exemplary embodiment of the present invention, as shown in fig. 11, the needle withdrawing rod 3 includes a first pressing portion 303; as shown in fig. 12, the first pressing portion 303 is adapted to press the first elastic arm 212 to deform in a direction away from the axis of the lancet when the needle withdrawing rod 3 is located at the needle withdrawing position, so that the first elastic arm 212 reaches the first radial position; as shown in fig. 13, the first pressing portion 303 is further adapted to press the first elastic arm 212 to deform toward the axial direction of the lancet when the needle withdrawing rod 3 is located at the needle installing position, so that the first elastic arm 212 reaches the second radial position.

For example, the first pressing portion 303 may be a protrusion structure, for example, the first pressing portion 303 shown in fig. 11 is a columnar protrusion, this structure is merely an example, and the specific structure of the first pressing portion 303 is not limited, for example, it may also be a plate structure, a step structure, or other structures.

Alternatively, in other exemplary embodiments of the present invention, the first elastic arm 212 is located at the second radial position in a natural state, or the first elastic arm 212 is not abutted to the first limiting portion 409 in a natural state, during the needle withdrawing rod 3 moves to the needle withdrawing position towards the proximal end, the needle withdrawing rod 3 presses the first elastic arm 212, so that the first elastic arm 212 reaches the first radial position and is abutted to the first limiting portion 409, during the needle withdrawing rod 3 moves to the needle loading position towards the distal end, the needle withdrawing rod 3 does not press the first elastic arm 212 any more, so that the first elastic arm 212 returns to the second radial position.

The proximal end in the embodiments of the present invention may be understood as a proximal blood collection end, i.e., an end close to the blood collection site (or an end close to the cap), and the distal end may be understood as a distal blood collection end, i.e., an end far from the blood collection site (or an end far from the cap).

In an exemplary embodiment of the present invention, as shown in fig. 7, the core 2 further includes a connection plate 220, the connection plate 220 is connected to the first elastic arm 212, and is disposed at one side of the first elastic arm 212 in the axial direction of the lancet;

the connecting plate 220 has a first guide structure 207, and the first pressing portion 303 is adapted to move in the first guide structure 207 to press the first elastic arm 212 to deform in a direction away from or toward the axis of the lancet.

For example, as shown in fig. 7, the first guiding structure 207 may be a guiding groove, or the first guiding structure 207 may also be a guiding rib, a guiding rail, or the like, and the specific structure of the first guiding structure 207 is not limited.

As shown in fig. 14a, the first pressing portion 303 moves in the first guide structure 207, and the moving track of the first pressing portion 303 is parallel or approximately parallel to the axial direction of the lancet, so that a leftward force is applied to the first elastic arm 212 during the movement of the first pressing portion 303 from the lowest position to the highest position of the first guide structure 207, that is, the first elastic arm 212 is pressed to deform toward the axial direction of the lancet, and a rightward force is applied to the first elastic arm 212 during the movement of the first pressing portion 303 from the highest position to the lowest position of the first guide structure 207, that is, the first elastic arm 212 is pressed to deform away from the axial direction of the lancet.

In an exemplary embodiment of the present invention, as shown in fig. 15, the first guide structure 207 includes a first partial slot 20710, a second partial slot 20720 and a third partial slot 20730, a distance between the first partial slot 20710 and an axial direction of the lancet is greater than a distance between the third partial slot 20730 and the axial direction of the lancet, and the second partial slot 20720 is disposed between the first partial slot 20710 and the third partial slot 20730;

as shown in fig. 13, the first pressing part 303 presses the first elastic arm 212 to be deformed toward the axial direction close to the lancet when it is located in the first partial slot 20710, and as shown in fig. 12, the first pressing part 303 presses the first elastic arm 212 to be deformed toward the axial direction away from the lancet when it is located in the third partial slot 20730.

In fig. 15, when the first extrusion 303 is located in the first partial slot 20710, the first extrusion 303 is in contact with at least one of the two

faces

2071 and 2073 in the first partial slot 20710, and when the first extrusion 303 is located in the third partial slot 20730, the first extrusion 303 is in contact with at least one of the two

faces

2072 and 2074 in the third partial slot 20730.

Alternatively, in another exemplary embodiment of the present invention, the connection plate 220 may be omitted, and a matching structure is disposed between the first elastic arm 212 and the first pressing portion 303, so that the first pressing portion 303 may press the first elastic arm 212 to deform in a direction away from or close to the axis of the lancet.

In an exemplary embodiment of the present invention, as shown in fig. 7, the core 2 is provided with a core hole 206; as shown in fig. 10, the needle withdrawing rod 3 is provided with a first protrusion 301; the first projection 301 is adapted to be inserted into the core hole 206.

In this embodiment, the needle withdrawing rod 3 is disposed on the needle core 2. The needle core 2 and the needle withdrawing rod 3 can be matched as shown in fig. 27a and 27b, and the embodiment of the invention does not limit the specific position relation between the needle withdrawing rod 3 and the needle core 2.

In an exemplary embodiment of the invention, as shown in fig. 7, the core 2 further comprises a second resilient arm 210, the second resilient arm 210 being closer to the distal side than the first resilient arm 212;

as shown in fig. 5, the inner wall of the housing 4 is further provided with a second limiting portion 408, and the second limiting portion 408 is closer to the far end than the first limiting portion 409;

as shown in fig. 12, when the core 2 is in the non-ready-to-fire state (not loaded), the second resilient arm 210 abuts against the second stopper 408, and as shown in fig. 14a, during the process of moving the core 2 to the ready-to-fire state, the second resilient arm 210 disengages from the second stopper 408.

If the lancet 12 is inserted from the cap hole 104, the second elastic arm 210 abuts against the second stopper 408, thereby preventing the movement of the core 2 in the axial direction of the lancet; the lancet 12 pushes the retreating needle bar 3 to move distally relative to the needle core 2 until the lancet is engaged and fixed with the needle seat 213 of the needle core 2. If the second elastic arm 210 and the second stopper 408 are omitted, when the lancet 12 is loaded, the lancet 12 pushes the needle withdrawing rod 3 to move to the distal end, and also pushes the needle core 2 to move to the distal end, so that the moving distance of the lancet or the distance for pushing the lancet becomes larger. Therefore, with the present embodiment, the moving distance of the lancet can be shortened.

In an exemplary embodiment of the present invention, the lancet further comprises: a tail cap 5, a tail cap inner core 7 and a tail cap rotor 9. Fig. 16-18 are schematic views of the tail cap 5 in an exemplary embodiment of the invention, the tail cap 5 being disposed at the distal end of the housing 4. Fig. 19-20 are schematic structural views of a tail cap inner core 7 in an exemplary embodiment of the invention, wherein at least a portion of the tail cap inner core 7 is disposed inside the tail cap 5. Fig. 21-22 are schematic structural views of the tail cap rotor 9 in an exemplary embodiment of the invention, the tail cap rotor 9, disposed at the distal end of the tail cap 5, is adapted to rotate relative to the tail cap 5. Wherein, the rotation of the tail cap rotor 9 is suitable for driving the tail cap inner core 7 to move axially so as to adjust the puncture depth of the blood taking needle.

In this embodiment, through rotating the puncture depth of tail cap rotor regulation blood taking needle, this embodiment compares in the puncture depth of adjusting the blood taking needle through the pen cap, can improve the security of operation. For example, if a scheme of adjusting the puncturing depth of the blood taking needle through the pen cap is adopted, the user usually aligns the needle outlet side with the user for viewing conveniently in the process of rotating the pen cap, and thus, the operation safety is poor. And if adopt this embodiment, the user is at the in-process of rotating the tail cap rotor, for convenient looking over, can be with going out needle one side back to oneself, like this, has improved the security of operation.

In an exemplary embodiment of the present invention, as shown in fig. 18, the inner wall of the tail cap 5 is provided with a second protrusion 506, as shown in fig. 19, the outer wall of the tail cap inner core 7 is provided with a second guiding structure 701 in a spiral shape, and the second protrusion 506 is adapted to cooperate with the second guiding structure 701, so that the tail cap inner core 7 rotates relative to the tail cap 5 while generating an axial displacement.

For example, as shown in fig. 19, the second guiding structure 701 may be a guiding groove, or the second guiding structure 701 may also be a guiding rib, a guiding rail, or the like, and the specific structure of the second guiding structure 701 is not limited.

Alternatively, in other exemplary embodiments of the present invention, the tail cap 5 and the tail cap inner core 7 may also adopt other matching structures, so that the tail cap inner core 7 rotates relative to the tail cap 5 and generates axial displacement at the same time, and the matching structure of the tail cap 5 and the tail cap inner core 7 is not limited in the embodiments of the present invention.

In an exemplary embodiment of the present invention, as shown in fig. 20, a first mating portion 704 is disposed on an outer wall of the tail cap inner core 7, as shown in fig. 22, a second mating portion 903 is disposed on an inner wall of the tail cap rotor 9, and the first mating portion 704 is mated with the second mating portion 903, so that the tail cap rotor 9 drives the tail cap inner core 7 to rotate together.

The first mating portion 704 shown in fig. 20 is a tab-type mating portion that includes a symmetrically disposed two-part structure, each part including two oppositely disposed sidewalls with a gap therebetween adapted to receive the second mating portion 903. Fig. 22 shows that the second mating portion 903 includes two symmetrically disposed ribs, each interposed between two sidewalls of the first mating portion.

Fig. 20 and 22 are merely exemplary, and specific configurations of the first engagement portion 704 and the second engagement portion 903 are not limited. For example, the first mating portion 704 may include a plurality of portions disposed circumferentially along the tail cap inner core 7, each portion including two oppositely disposed sidewalls, and correspondingly, the second mating portion 903 may include a plurality of ribs disposed circumferentially along the tail cap rotor 9, each rib being inserted into a gap between the two sidewalls. For another example, the first mating portion 704 may include only two oppositely disposed sidewalls, and the second mating portion 903 may include only one rib inserted into a gap between the two sidewalls.

In one exemplary embodiment of the invention, as shown in fig. 23, the stylet 2 is disposed inside the housing 4 and extends into the interior of the tail cap inner core 7;

the inside of tail cap inner core 7 is provided with and stops piece 8 and first elastic component 11, stops piece 8 and under the effect of tail cap inner core 7 and first elastic component 11, drives the nook closing member 2 and carries out axial motion at the within range of predetermineeing.

For example, the blocking member 8 may be a flap, the first elastic member 11 may be a spring, and the specific types of the blocking member 8 and the first elastic member 11 are not limited. In fig. 23, the hook 209 (the hook 209 is shown in fig. 7) at the tail of the needle core 2 abuts against the distal surface of the blocking member 8, so that during loading, after the blood collection needle is loaded, the tail cap 5 is pulled distally to drive the tail cap inner core 7 to move distally together, the proximal surface of the tail cap inner core 7 abuts against the first elastic member 11, the first elastic member 11 abuts against the blocking member 8, and the blocking member 8 abuts against the hook 209 at the tail of the needle core 2, thus driving the needle core 2 to move distally.

Rotating the tail cap rotor 9 to rotate the tail cap inner core 7 to the nearest end relative to the pen cap 1, and when the blocking piece 8 moves to the contact of the near end surface 803 of the blocking piece 8 and the surface 703 of the tail cap inner core 7, the distance of the needle tip of the blood taking needle 12 exposed out of the pen cap end surface 106 is longest, and the skin penetration depth is deepest; when the tail cap rotor 9 is rotated to rotate the tail cap inner core 7 to the farthest end relative to the pen cap 1 and the blocking piece 8 moves until the proximal end surface 803 of the blocking piece 8 is contacted with the surface 703 of the tail cap inner core 7, the distance of the needle point of the blood taking needle exposed out of the pen cap end surface 106 is shortest and the skin penetration depth is shallowest. Thus, the puncture depth of the blood taking needle can be adjusted.

In an exemplary embodiment of the present invention, the blood collection pen further comprises: the tail cap 5, as shown in fig. 16, the tail cap 5 includes a tail cap bullet wall 501 extending in the axial direction of the lancet, wherein: the tail cap bullet wall 501 is provided with a launching part 504, and the launching part 504 is suitable for triggering the blood sampling action of the blood sampling pen when the tail cap bullet wall 501 is pressed.

In this embodiment, realize the function of transmission through the tail cap bullet wall, need not additionally set up the transmission key again, and parts have been reduced to this scheme of seeing, have simplified the structure.

In an exemplary embodiment of the invention, as shown in fig. 9, the core 2 comprises a needle seat 213 and a fourth elastic arm 204, the needle seat 213 being adapted to hold a lancet 12, as shown in fig. 14a, an end face 216 of the fourth elastic arm 204 being adapted to abut against an abutment 105 provided on the inner wall of the lancet, in the condition in which the lancet 12 is ready to be fired.

The blood sampling pen still includes: in the second elastic member 10, as shown in fig. 14a, when the tail cap elastic wall 501 is pressed, the emitting portion 504 pushes the fourth elastic arm 204 to disengage from the abutting portion 105, so that the stylet 2 is driven by the second elastic member 10 to move towards the proximal end.

For example, the abutting portion 105 may be disposed on an inner wall of the lancet case or an inner wall of the lancet cap, and the specific position is not limited.

The "cocked state" referred to herein may be understood as a "cocked state", and the embodiment of the present invention does not limit the specific structure involved in the cocking, firing, etc. of the lancet pen, for example, when the lancet is in the cocked state, other structures such as a snap-fit structure may be adopted to keep the needle core at the corresponding position.

In an exemplary embodiment of the present invention, the lancet further includes: a tail cap 5 and a needle withdrawing key 6. As shown in FIG. 16, the tail cap 5 includes a tail cap bullet wall 501 extending in the axial direction of the lancet. As shown in fig. 14a, the needle withdrawing key 6 is slidably provided on the tail cap spring wall 501 in the axial direction of the lancet, and the needle withdrawing operation of the lancet is triggered based on a predetermined sliding movement of the needle withdrawing key 6 in the axial direction.

In the embodiment, the needle withdrawing function is realized on the bullet wall of the tail cap, and the structure is simplified.

In an exemplary embodiment of the present invention, the lancet further comprises: the tail cap comprises a tail cap inner core 7 and a blocking piece 8, wherein at least one part of the tail cap inner core 7 is arranged inside the tail cap 5, and the blocking piece 8 is arranged inside the tail cap inner core 7.

As shown in fig. 44, when the needle withdrawing key 6 moves axially toward the proximal end, the needle withdrawing rod 3 is pushed to move axially toward the proximal end until the stopper 8 abuts against the tail cap core 7, and the needle withdrawing operation of the blood sampling pen is triggered.

The embodiment of the invention does not limit the specific needle withdrawing structure.

In an exemplary embodiment of the present invention, as shown in fig. 44, the distal end face (end face on the inside of the distal end) of the core 2 abuts against the distal end face of the stopper 8, and the needle withdrawing rod 3 is connected to the core 2;

when the needle withdrawing key 6 moves axially towards the near end, the needle withdrawing rod 3 is pushed to move axially towards the near end, and the needle core 2 is driven to move axially towards the near end until the near end surface 803 of the blocking piece 8 abuts against the near end surface 703 of the tail cap inner core 7, the needle core 2 is blocked from moving continuously towards the near end, and the needle withdrawing rod 3 pushes the blood taking needle 12 out of the needle seat 213.

Specifically, in fig. 44, when the proximal end surface 803 of the stopper 8 comes into contact with the surface 703 of the tail cap core 7, the proximal movement of the needle core 2 is stopped, the needle withdrawing rod 3 continues to move proximally with respect to the needle core 2, the needle withdrawing rod 3 withdraws the lancet 12 from the needle holder 213, and the lancet 12 falls off.

Therefore, in the embodiment, on one hand, the needle withdrawing action of the blood taking pen cannot be triggered even if the needle withdrawing operation is executed after needle installation and loading, so that the safety is improved, and on the other hand, the needle can be withdrawn normally after the blood taking needle is launched, so that the normal use is not influenced.

The above-described embodiment of "the emitting portion 504 is provided on the tail cap bullet wall 501" and the embodiment of "the needle withdrawing key 6 is provided on the tail cap bullet wall 501" may be combined, that is, the lancet includes: tail cap 5 and withdraw of needle key 6, tail cap 5 includes along the axially extended tail cap bullet wall 501 of blood sampling pen, wherein: the tail cap bullet wall 501 is provided with a launching part 504, and the launching part 504 is suitable for triggering the blood sampling action of the blood sampling pen when the tail cap bullet wall 501 is pressed; the needle withdrawing key 6 is slidably disposed on the tail cap bullet wall 501 in the axial direction of the blood sampling pen, and based on the predetermined sliding of the needle withdrawing key 6 in the axial direction, the needle withdrawing action of the blood sampling pen is triggered.

In the embodiment, the functions of launching and withdrawing the needle are realized through the bullet wall of the tail cap, so that the number of parts is reduced, and the structure is simplified.

In an exemplary embodiment of the invention, as shown in fig. 7, the core 2 comprises a blocking portion 205; as shown in fig. 10-11, the needle withdrawing rod includes a

resilient portion

300, and 302, 307, 305, 308 shown in fig. 10-11 are the respective faces of the resilient portion 300.

As shown in FIG. 14a, when the lancet is in a ready-to-fire state, the blocking portion 205 abuts against the elastic portion 300 to prevent the needle withdrawing rod 3 from triggering the needle withdrawing action of the lancet (the lancet 12 is not shown in FIG. 14 a).

As above, "treat the shooting state" can understand "loading state", in this scheme, the blood taking needle on the needle file is in under treating the shooting state, and barrier part and elasticity portion butt to the needle withdrawing rod that prevents triggers the action of moving back of needle of blood sampling pen, even if like this, user's misoperation, for example carried out the operation of moving back of needle after dress needle, loading, can not trigger the action of moving back of needle of blood sampling pen yet, improved the security.

In an exemplary embodiment of the present invention, as shown in fig. 4, the housing 4 includes a second pressing portion 410; at least a part of the stylet 2 is arranged inside the housing 4; as shown in fig. 14a, in the process of moving the stylet 2 to the state to be fired, the second pressing portion 410 presses the elastic portion 300 to deform, so that the blocking portion 205 abuts against the elastic portion 300.

Alternatively, in other exemplary embodiments, the elastic portion 300 may be pressed by other structures in the lancet so that the blocking portion 205 abuts against the elastic portion 300, and the specific structure is not limited, for example, some lancets are provided with an inner sleeve, an outer sleeve, and other members, and protrusions may be provided on these members to press the elastic portion 300 so that the blocking portion 205 abuts against the elastic portion 300. Alternatively, the needle core may be provided with a deformable elastic portion, and the needle withdrawing rod may be provided with a stopper.

In an exemplary embodiment of the present invention, during the process that the needle withdrawing rod 3 moves to the needle withdrawing state, the second pressing portion 410 is separated from the elastic portion 300, and the elastic portion 300 returns to the undeformed state, so that the blocking portion 205 is separated from the elastic portion 300.

The present embodiment does not limit the specific needle withdrawing structure. For example, as shown in fig. 44, when the needle withdrawing key 6 axially moves toward the proximal end after the lancet is fired, the needle withdrawing rod 3 is pushed to axially move toward the proximal end and the core 2 is driven to axially move toward the proximal end until the proximal end surface 803 of the stopper 8 abuts against the proximal end surface 703 of the tail cap core 7, the stopper core 2 continues to move toward the proximal end, the needle withdrawing rod 3 continues to move toward the proximal end with respect to the core 2, the needle withdrawing rod 3 withdraws the lancet 12 from the needle holder 213, and the lancet 12 falls off.

In an exemplary embodiment of the present invention, the lancet further comprises: a pin withdrawing key 6, fig. 24-25 are schematic structural views of the pin withdrawing key 6 in an exemplary embodiment of the invention, and the pin withdrawing key 6 is adapted to push the elastic portion 300 to return to an undeformed state.

In this embodiment, if the elastic portion 300 cannot be completely restored to the undeformed state, the pin-withdrawing key 6 can assist the elastic portion 300 to be completely restored to the undeformed state.

For example, the needle withdrawing key 6 applies a force to the elastic part 300 in a direction opposite to the direction of the force applied to the elastic part 300 by the second pressing part 410 during pushing the needle withdrawing rod 3, and the force applied by the needle withdrawing key 6 restores the elastic part 300 to an undeformed state.

In an exemplary embodiment of the present invention, as shown in fig. 25, the needle withdrawing key 6 includes a wedge portion 604, as shown in fig. 14b, the slope of the wedge portion 604 applies a pushing force (pushing force in a laterally outward direction in fig. 14 b) to the elastic portion 300 away from the axial direction of the lancet. Thus, the elastic structure of the needle withdrawing rod is restored to the natural state.

Turning now to a specific embodiment, as shown in fig. 26, a lancet includes: the pen cap comprises a pen cap 1, a needle core 2, a needle withdrawing rod 3, a second elastic piece 10, a shell 4, a tail cap 5, a needle withdrawing key 6, a tail cap inner core 7, a first elastic piece 11, a blocking piece 8 and a tail cap rotor 9, and a blood taking needle 12 is installed in the pen cap. The second elastic member 10 may be a firing spring, and the first elastic member 11 may be a return spring.

Wherein the pen cap 1 is positioned on one side of the shell 4 towards the proximal end. The distal end surface 101 of the pen cap 1 is contacted with the proximal end surface 401 of the shell 4, the side wall surface 102 of the pen cap 1 is contacted with the side wall surface 402 of the shell 4, and the relative positions of the pen cap 1 and the shell 4 are fixed; the stylet 2 is positioned inside the pen cap 1 and the housing 4, the elongated structure 201 of the stylet 2 passes through the hole 403 in the housing, the base structure 202 of the stylet 2 is positioned in the cavity 103 of the pen cap 1, the ribs 203 of the stylet 2 are matched with the grooves 406 of the housing 4, each groove 406 comprises two oppositely arranged side walls, each rib 203 is respectively inserted into a gap between a pair of side walls, the fourth elastic arm 204 of the stylet 2 is positioned on the same side (circumferential direction) with the surface 404 of the housing 4, and the stylet 2 can axially move relative to the housing 4.

A second elastic element 10 is arranged between the stop 205 arranged on the stylet 2 and one face 405 of the housing 4, and the second elastic element 10 is sleeved on the stylet 2.

On the stylet 2, a needle withdrawing rod 3 is further provided, the stylet 2 and the needle withdrawing rod 3 can be matched as shown in fig. 27a and 27b, a first bulge 301 on the needle withdrawing rod 3 passes through a core hole 206 on the stylet, and a first pressing part 303 on the needle withdrawing rod 3 moves in a first guide structure 207 on the stylet 2. The retraction shaft 3 is axially movable relative to the core 2 distally to move the first pressing portion 303 into contact with the surface 2071 in the first guide structure 207 and proximally to move the first pressing portion 303 into contact with the surface 2074 in the first guide structure 207 with the surface 304 in the retraction shaft 3 in contact with the surface 208 in the core.

The tail cap 5 is arranged in the cavity on one side of the outer shell 4 facing the far end, the mounting groove 502 on the tail cap 5 is matched with the mounting rib 407 on the inner wall of the outer shell 4, and the elastic arm 501 of the tail cap is arranged on the same side (circumferential direction) with the surface 404 of the outer shell 4, so that the tail cap 5 can move axially relative to the outer shell 4.

The tail cap elastic arm 501 is provided with a needle withdrawing key 6. The hole 601 on the needle withdrawing key 6 passes through the tail cap elastic arm 501, and the needle withdrawing key 6 can move axially relative to the tail cap elastic arm 501. The needle withdrawing key 6 can move to the far end until the surface 602 of the needle withdrawing key 6 contacts with the surface 503 of the tail cap, and can move to the near end until the surface 603 of the needle withdrawing key 6 contacts with the surface 505 of the tail cap.

At least one part of the tail cap inner core 7 is arranged in the tail cap 5, the inner wall of the tail cap 5 is provided with a second protrusion 506, the outer wall of the tail cap inner core 7 is provided with a spiral second guide structure 701, and the second protrusion 506 is matched with the second guide structure 701, so that the tail cap inner core 7 can move circumferentially relative to the tail cap 5 and can generate axial relative displacement with the tail cap 5. The elongate structure 201 of the stylet 2 can be passed through the bore 702 of the tail cap inner core 7.

At the trailing, i.e. distal, end of the hub 2, a blocking member 8 is provided, and a hook-like formation 209 at the distal end of the hub 2 engages the distal face of the blocking member 8, such that the blocking member 8 cannot be withdrawn from the distal end of the hub 2.

A first elastic element 11 is arranged between the surface 703 of the tail cap inner core 7 and the blocking element 8, and the first elastic element 11 is sleeved on the extending structure 201 of the needle core 2.

A tail cap rotor 9 is arranged at the far end of the tail cap 5, and a protrusion 507 in the tail cap 5 is matched with a groove 901 in the tail cap rotor 9, so that the tail cap rotor 9 can do circumferential rotation motion relative to the tail cap 5, or the groove arranged in the tail cap 5 is matched with a protrusion arranged in the tail cap rotor 9, so that the tail cap rotor 9 does circumferential rotation motion relative to the tail cap 5. The ribs 902 in the tail cap rotor 9 cooperate with the detents 508 in the tail cap 5 so that a graduated feel is felt with a slight click when the tail cap rotor is turned. The detents 508 may be circumferentially distributed in the inner wall of the tail cap 5, and the number of detents 508 is not limited.

The outer wall of the tail cap inner core 7 is provided with a first matching portion 704, the inner wall of the tail cap rotor 9 is provided with a second matching portion 903, and the first matching portion 704 is matched with the second matching portion 903, so that the tail cap rotor 9 drives the tail cap inner core 7 to rotate together. Therefore, when the tail cap rotor 9 does circumferential motion relative to the tail cap 5, the tail cap inner core 7 and the tail cap 5 can be driven to perform circumferential motion and generate axial displacement.

The action process of the blood sampling pen is described as follows:

as shown in fig. 28, when the lancet pen is in a needle-free and loaded state, under the action of the first elastic element 11, the second elastic arm 210 of the needle core 2 abuts against the second limiting part 408, the surface 304 of the needle withdrawing rod 3 contacts with the surface 208 of the needle core, and the first pressing part 303 of the needle withdrawing rod 3 contacts with at least one of the two

surfaces

2072 and 2074 of the third slot 20730 in the first guide structure 207. At this time, the first pressing portion 303 presses the first elastic arm 212 to abut against the first position-limiting portion 409 in the inner wall of the housing 4. The needle withdrawing key 6 can be arranged at any position between the surface 503 of the tail cap and the surface 305 of the needle withdrawing rod 3.

When the lancet 12 is loaded from the cap hole 104, as shown in fig. 29 and 30, the second elastic arm 210 abuts against the second stopper 408, so that the movement of the core 2 toward the distal end is prevented; the lancet 12 pushes the retreating rod 3 to move distally relative to the core 2 until the lancet engages with the needle seat 213 of the core 2, and the retreating rod 3 is pushed into the first pressing portion 303 and the first slot 20710 of the first guide structure 207, at this time, the first pressing portion 303 contacts with at least a part of the

surface

2073 or 2071 of the first guide structure 207, and the first pressing portion 303 presses the first elastic arm 212 to deform in the axial direction approaching the lancet.

After lancet 12 is loaded, the needle cap may be twisted off, as shown in FIG. 31.

The loading action may then be performed:

as shown in Figs. 32-34, the tail cap 5 is pulled backward until the surface 509 of the tail cap 5 contacts the third elastic arm 214 of the stylet, and the surface 509 of the tail cap 5 pushes the third elastic arm 214 to deform, so that the second elastic arm 210 is disengaged from the second stopper 408, and the stylet 2 can move distally relative to the housing 4.

As shown in fig. 35-37, the tail cap 5 is pulled further back until one of the boss faces 215 of the hub contacts one face 405 of the housing 4. When the tail cap 5 is released, the end surface 216 of the fourth resilient arm 204 of the plunger 2 engages with the abutment 105 of the cap 1, as shown in fig. 14 a. The tail cap 5 is returned to the normal state by the first elastic member 11, and at this time, the second elastic member 10 is compressed and acts on the stopper 205 of the core 2, and as shown in fig. 37, one face 510 of the tail cap 5 is brought into contact with one face 411 of the housing 4 by the first elastic member 11. The blood sampling pen is in a cocked state to be launched at the moment.

In the process that the stylet 2 moves towards the far end relative to the shell 4, the needle withdrawing rod 3 is fixed relative to the stylet 2, so that the needle withdrawing rod 3 also moves towards the far end relative to the shell 4; during the movement, one surface 302 of the needle withdrawing rod 3 is contacted with the second pressing part 410 of the shell, and the surface 302 of the needle withdrawing rod is deformed inwards under the action of the second pressing part 410. Inwardly may be understood as facing in a direction close to the axis of the lancet.

As shown in fig. 14a and 38, when the end surface 216 of the fourth elastic arm 204 of the stylet 2 is engaged with the abutting portion 105 of the cap 1, one elastic arm surface 307 of the needle withdrawing rod 3 abuts against the stopper 205 of the stylet 2.

The transmit action may then be performed:

in the condition shown in fig. 35, pressing the emitting portion 504 of the tail cap elastic 501, 501 pushes the buckling end surface 217 of the stylet 2 inward, so that the fourth elastic arm 204 of the stylet 2 is deformed in an inward bending manner, the end surface 216 of the fourth elastic arm 204 of the stylet 2 is no longer buckled with the abutting portion 105 of the pen cap, the stylet 2 moves axially and proximally under the force of the second elastic member, and when the proximal end surface 803 of the stopper 8 contacts with the surface 703 of the tail cap plunger 7, the stylet 2 stops moving proximally, as shown in fig. 39; at this time, as shown in fig. 40, the lancet 12 moves to the farthest end with respect to the cap 1, and the distance that the needle tip is exposed to the cap 1 is longest. Subsequently, the core 2 is restored to the state shown in fig. 41 by the first elastic member 11.

Needle withdrawing action:

after blood collection is finished, the needle is ready to be withdrawn, and the needle tip can be inserted into the needle cap before the needle is withdrawn, as shown in fig. 42, so that the operation safety can be improved, for example, after the blood collection needle falls off, the needle tip is exposed, and the accidental injury to a person can be caused, and if the needle tip is inserted into the needle cap, the accidental injury to the person can be reduced. The needle tip is not necessarily inserted into the needle cap, and the needle withdrawal is not affected.

As shown in FIG. 43, the needle withdrawing key 6 is pushed to move the needle withdrawing key 6 axially and proximally relative to the tail cap 5 and the housing 4. When the needle withdrawing key 6 is pushed towards the near end, one end face 603 of the needle withdrawing key 6 pushes the face 305 of the needle withdrawing rod to enable the needle withdrawing rod 3 to axially move towards the near end, the end face 306 of the first bulge 301 of the needle withdrawing rod 3 is contacted with the end face of the tail part of the blood taking needle 12, the clamping force of the blood taking needle 12 and the needle seat 214 is greater than the acting force of the first elastic element 11 and the needle core 2, the blood taking needle 12 and the needle core 2 are in a relatively fixed state, and therefore the needle withdrawing rod 3 simultaneously drives the blood taking needle 12 and the needle core 2 to move towards the near end.

As shown in FIG. 44, the stylet 2 stops moving proximally when the proximal face 803 of the stop 8 contacts the face 703 of the tail cap plunger 7 as the stylet 2 moves proximally.

The retreating needle key 6 continues to push the retreating needle bar 3 to move towards the near end, and the end surface 306 of the first bulge 301 of the retreating needle bar 3 pushes the tail end surface of the blood taking needle 12, so that the retreating needle bar 3 and the needle core 2 generate relative displacement. When the retreating needle bar 3 and the core 2 move relatively, the retreating needle bar 3 retreats the lancet 12 from the needle seat 213, and the lancet 12 falls off as shown in fig. 45. At this point, as shown in fig. 46, the needle withdrawing rod 3 moves to the proximal end of the needle core 2 relative to the needle core 2, and the first elastic arm 212 is maintained in an outwardly deformed state.

After the needle withdrawing key 6 is restored to the original position, the blood sampling pen is restored to the state shown in fig. 28.

The second elastic arm 210 and the related structure in this embodiment can be omitted, as shown in fig. 47.

If the lancet 12 is inserted from the cap hole 104, the second elastic arm 210 abuts against the second stopper 408, thereby preventing the movement of the core 2 in the axial direction of the lancet; the lancet 12 pushes the retreating needle bar 3 to move distally relative to the needle core 2 until the lancet is engaged and fixed with the needle seat 213 of the needle core 2. If the second elastic arm 210 and the second stopper 408 are omitted, when the lancet 12 is loaded, the lancet 12 pushes the needle withdrawing rod 3 to move to the distal end, and also pushes the needle core 2 to move to the distal end, so that the moving distance of the lancet or the distance for pushing the lancet becomes larger.

The function of the second resilient arm 210 and the associated structure is that, when the lancet is loaded, the core 2 does not move distally relative to the housing 4, the lancet 12 is more easily engaged with the hub 213, and the core 2 is not loaded. After the shooting, when the needle tip of the blood taking needle is pricked into the needle cap, the needle core 2 can not move towards the far end, and the operation is easier.

If second resilient arm 210 and related structures are omitted, when the lancet is loaded, lancet 12 will push core 2 to move distally relative to housing 4 until lancet 12 engages with hub 213. The needle core 2 can be moved to the upper chamber state by continuously pushing the blood taking needle.

Based on the above, the invention provides the following technical scheme:

1. a lancet, comprising:

a cap (1) provided with a cap hole (104) adapted to insert the lancet (12);

a housing (4) having a first stopper (409) provided on an inner wall thereof;

a cartridge (2) comprising a hub (213), the hub (213) being adapted to hold a lancet (12) inserted from the cap aperture (104);

a needle withdrawing rod (3),

wherein:

the needle core (2) further comprises a first elastic arm (212), when the needle withdrawing rod (3) is located at a needle withdrawing position, the first elastic arm (212) is driven to be located at a first radial position, and when the needle withdrawing rod (3) is located at a needle installing position, the first elastic arm (212) is driven to be located at a second radial position;

the first elastic arm (212) is suitable for abutting against the first limiting part (409) when in the first radial position so as to prevent the needle core (2) from moving towards the far end to a state to be launched, and is separated from the first limiting part (409) when in the second radial position.

2. The blood collection pen according to claim 1, wherein,

the needle withdrawing rod (3) comprises a first pressing part (303);

the first pressing part (303) is suitable for pressing the first elastic arm (212) to deform towards the direction away from the axis of the blood sampling pen when the needle withdrawing rod (3) is located at the needle withdrawing position, so that the first elastic arm (212) reaches the first radial position; and when the needle withdrawing rod (3) is positioned at the needle installing position, the first elastic arm (212) is pressed to deform towards the axial direction close to the blood sampling pen, so that the first elastic arm (212) reaches the second radial position.

3. The lancet according to claim 2, wherein,

the needle core (2) further comprises a connecting plate (220), the connecting plate (220) is connected with the first elastic arm (212) and is arranged on one side, close to the axial direction of the blood sampling pen, of the first elastic arm (212);

the connecting plate (220) is provided with a first guide structure (207), and the first pressing part (303) is suitable for moving in the first guide structure (207) to press the first elastic arm (212) to deform towards the direction away from or close to the axis of the blood sampling pen.

4. The lancet of claim 3, wherein,

the first guide structure (207) comprises a first partial slot (20710), a second partial slot (20720) and a third partial slot (20730), the distance between the first partial slot (20710) and the axial direction of the blood sampling pen is greater than the distance between the third partial slot (20730) and the axial direction of the blood sampling pen, and the second partial slot (20720) is arranged between the first partial slot (20710) and the third partial slot (20730);

when being located in the first part slot (20710), the first extrusion part (303) extrudes the first elastic arm (212) to deform towards the axis direction close to the blood sampling pen, and when being located in the third part slot (20730), the first extrusion part (303) extrudes the first elastic arm (212) to deform towards the axis direction far away from the blood sampling pen.

5. The lancet according to any one of claims 1 to 4, wherein,

the needle core (2) is provided with a core hole (206); a first bulge (301) is arranged on the needle withdrawing rod (3); the first protrusion (301) is adapted to be inserted into the core hole (206).

6. The blood collection pen according to claim 1, wherein,

the stylet (2) further comprises a second resilient arm (210), the second resilient arm (210) being more distal than the first resilient arm (212);

the inner wall of the shell (4) is also provided with a second limiting part (408), and the second limiting part (408) is closer to the far end than the first limiting part (409);

under the condition that the stylet (2) is in a non-to-be-launched state, the second elastic arm (210) is abutted to the second limiting part (408), and in the process that the stylet (2) moves towards the far end to be launched state, the second elastic arm (210) is separated from the second limiting part (408).

7. The lancet of claim 1, wherein the lancet further comprises:

a tail cap (5) disposed at a distal end of the housing (4);

a tail cap inner core (7) at least partially disposed within the tail cap (5);

a tail cap rotor (9) arranged at the distal end of the tail cap (5) and adapted to rotate relative to the tail cap (5);

wherein the rotation of the tail cap rotor (9) is adapted to drive the tail cap inner core (7) to move axially to adjust the depth of penetration of the lancet (12).

8. The lancet of claim 7, wherein,

the inner wall of the tail cap (5) is provided with a second protrusion (506), the outer wall of the tail cap inner core (7) is provided with a spiral second guide structure (701), and the second protrusion (506) is suitable for being matched with the second guide structure (701), so that the tail cap inner core (7) can rotate relative to the tail cap (5) and can generate axial displacement at the same time.

9. The lancet of claim 7, wherein,

be provided with first cooperation portion (704) on the outer wall of tail cap inner core (7), be provided with second cooperation portion (903) on the inner wall of tail cap rotor (9), first cooperation portion (704) with second cooperation portion (903) cooperate, make tail cap rotor (9) drive tail cap inner core (7) rotate together.

10. The lancet of claim 7, wherein,

the needle core (2) is arranged inside the shell (4) and extends to the inside of the tail cap inner core (7);

the needle core is characterized in that a blocking piece (8) and a first elastic piece (11) are arranged inside the tail cap inner core (7), and the blocking piece (8) drives the needle core (2) to axially move within a preset range under the action of the tail cap inner core (7) and the first elastic piece (11).

11. The lancet of claim 1, further comprising:

a tail cap (5) comprising a tail cap bullet wall (501) extending along the axial direction of the blood sampling pen,

wherein: the tail cap bullet wall (501) is provided with a launching part (504), and the launching part (504) is suitable for triggering the blood sampling action of the blood sampling pen under the condition that the tail cap bullet wall (501) is pressed.

12. The lancet of claim 11, further comprising: a second elastic member (10);

the needle core (2) further comprises a fourth elastic arm (204), and an end face (216) of the fourth elastic arm (204) is suitable for abutting against an abutting part (105) arranged on the inner wall of the blood taking pen when the blood taking needle (12) is in a state to be launched;

wherein: when the tail cap bullet wall (501) is pressed, the launching part (504) pushes the fourth elastic arm (204) to be separated from the abutting part (105), so that the stylet (2) moves towards the near end under the driving of the second elastic piece (10).

13. The lancet of claim 1, further comprising:

a tail cap (5) comprising a tail cap bullet wall (501) extending along the axial direction of the blood sampling pen;

the needle withdrawing key (6) is arranged on the tail cap bullet wall (501) in a sliding mode in the axial direction, and based on the preset movement of the needle withdrawing key (6) in the axial direction, the needle withdrawing action of the blood sampling pen is triggered.

14. The lancet of claim 13, further comprising:

a tail cap inner core (7) at least partially disposed within the tail cap (5);

a blocking piece (8) arranged inside the tail cap inner core (7);

wherein:

when the needle withdrawing key (6) axially moves towards the near end, the needle withdrawing rod (3) is pushed to axially move towards the near end until the blocking piece (8) is abutted against the tail cap inner core (7), and the needle withdrawing action of the blood sampling pen is triggered.

15. The lancet of claim 14, wherein,

the distal end surface of the needle core (2) is abutted against the distal end surface of the blocking part (8), and the needle withdrawing rod (3) is connected with the needle core (2);

move back needle key (6) when carrying out axial displacement towards the near-end, promote move back needle bar (3) and carry out axial displacement towards the near-end, and drive nook closing member (2) carry out axial displacement towards the near-end, until block the near-end face of piece (8) with during the near-end face butt of tail cap inner core (7), block nook closing member (2) continue to move to the near-end, make move back needle bar (3) will blood taking needle (12) are followed push out in needle file (213).

16. The lancet of claim 13, wherein,

the tail cap bullet wall (501) is provided with a launching part (504), and the launching part (504) is suitable for triggering the blood sampling action of the blood sampling pen when the tail cap bullet wall (501) is pressed.

17. The blood collection pen according to claim 1, wherein,

the needle core (2) comprises a blocking part (205), the needle withdrawing rod comprises an elastic part (300), the blood taking needle (12) is in a state of waiting to be launched, the blocking part (205) is abutted against the elastic part (300) to prevent the needle withdrawing rod (3) from triggering the needle withdrawing action of the blood taking pen.

18. The lancet of claim 17, the housing (4) further comprising a second pressing portion (410);

at least a portion of the stylet (2) is disposed inside the housing (4);

in the process that the stylet (2) moves towards the far end to be launched, the second extrusion part (410) extrudes the elastic part (300) to deform, so that the blocking part (205) is abutted to the elastic part (300).

19. The lancet of claim 18, wherein,

in the process that the needle withdrawing rod (3) moves to the needle withdrawing state towards the near end, the second extrusion part (410) is separated from the elastic part (300), and the elastic part (300) is restored to the undeformed state, so that the blocking part (205) is separated from the elastic part (300).

20. The lancet of claim 19, further comprising:

the needle withdrawing key (6) is suitable for pushing the elastic part (300) to restore to an undeformed state.

21. The lancet of claim 20, wherein,

the needle withdrawing key (6) comprises a wedge-shaped part (604), and the inclined surface of the wedge-shaped part (604) applies thrust to the elastic part (300) far away from the axial direction of the blood sampling pen.

22. A lancet, comprising:

a housing (4);

a tail cap (5) disposed at a distal end of the housing (4);

a tail cap inner core (7) at least partially disposed within the tail cap (5);

23. The lancet of claim 22, wherein,

the inner wall of the tail cap (5) is provided with a second protrusion (506), the outer wall of the tail cap inner core (7) is provided with a spiral second guide groove (701), and the second protrusion (506) is suitable for being matched with the second guide groove (701), so that the tail cap inner core (7) can rotate relative to the tail cap (5) and simultaneously generate axial displacement.

24. The lancet of claim 22, wherein,

the outer wall of the tail cap inner core (7) is provided with a first matching portion (704), the inner wall of the tail cap rotor (9) is provided with a second matching portion (903), and the first matching portion (704) is matched with the second matching portion (903), so that the tail cap rotor (9) drives the tail cap inner core (7) to rotate together.

25. The lancet of claim 22, further comprising:

a needle core (2) which is arranged inside the outer shell (4) and extends to the inside of the tail cap inner core (7), and comprises a needle seat (213) suitable for installing a blood taking needle (12);

wherein the content of the first and second substances,

the inside of tail cap inner core (7) is provided with and stops piece (8) and first elastic component (11), stop piece (8) be in tail cap inner core (7) with under the effect of first elastic component (11), drive nook closing member (2) carry out axial motion at the default zone.

26. The lancet of claim 22, further comprising:

a cap (1) provided with a cap hole (104) adapted to insert the lancet (12);

a needle withdrawing rod (3),

wherein:

the inner wall of the shell (4) is provided with a first limiting part (409), the needle core (2) further comprises a first elastic arm (212), the first elastic arm (212) is driven to be located at a first radial position when the needle withdrawing rod (3) is located at a needle withdrawing position, and the first elastic arm (212) is driven to be located at a second radial position when the needle withdrawing rod (3) is located at a needle installing position;

27. The lancet of claim 26, wherein,

the needle withdrawing rod (3) comprises a first pressing part (303);

28. The lancet of claim 27, wherein,

29. The lancet of claim 28, wherein,

when being located in the first partial groove body (20710), the first extrusion part (303) extrudes the first elastic arm (212) to deform towards the axis direction close to the blood sampling pen, and when being located in the third partial groove body (20730), the first extrusion part (303) extrudes the first elastic arm (212) to deform towards the axis direction far away from the blood sampling pen.

30. The lancet of any one of claims 26 to 29, wherein,

31. The lancet of claim 26, wherein,

32. The lancet of claim 22, the tail cap (5) comprising a tail cap bullet wall (501) extending in an axial direction of the lancet, wherein:

33. The lancet of claim 32, further comprising:

a needle core (2) comprising a needle seat (213) and a fourth elastic arm (204), wherein the needle seat (213) is suitable for holding a blood taking needle (12), and an end surface (216) of the fourth elastic arm (204) is suitable for abutting against an abutting part (105) arranged on the inner wall of the blood taking pen when the blood taking needle (12) is in a state of waiting to be launched;

a second elastic element (10),

34. The lancet according to 22, the tail cap (5) comprising a tail cap bullet wall (501) extending in an axial direction of the lancet;

the blood sampling pen further comprises a needle withdrawing key (6), the needle withdrawing key is slidably arranged on the tail cap bullet wall (501) in the axial direction, and the needle withdrawing action of the blood sampling pen is triggered based on the preset movement of the needle withdrawing key (6) in the axial direction.

35. The lancet of claim 34, further comprising:

a blocking piece (8) arranged inside the tail cap inner core (7);

a needle withdrawing rod (3);

wherein:

36. The lancet of claim 35, further comprising:

a core (2) comprising a needle seat (213), said needle seat (213) being adapted to hold a lancet (12);

wherein:

37. The lancet of claim 34, wherein,

the tail cap bullet wall (501) is provided with a launching part (504), and the launching part (504) is suitable for triggering the blood sampling action of the blood sampling pen under the condition that the tail cap bullet wall (501) is pressed.

38. The lancet of claim 22, further comprising:

a core (2) comprising a needle seat (213) adapted to hold a blood collection needle (12);

a needle withdrawing rod (3);

wherein:

39. The lancet of claim 38, the housing (4) comprising a second pressing portion (410); at least a portion of the stylet (2) is disposed inside the housing (4);

40. The lancet of 39, wherein,

41. The lancet of 40, further comprising:

42. The lancet of claim 41, wherein,

43. A lancet, comprising:

44. The lancet of 43, further comprising:

the needle core (2) comprises a needle seat (213) and a fourth elastic arm (204), the needle seat (213) is suitable for holding the blood taking needle (12), and the end surface (216) of the fourth elastic arm (204) is suitable for abutting against an abutting part (105) arranged on the inner wall of the blood taking pen when the blood taking needle (12) is in a state of waiting to be launched;

a second elastic element (10),

45. The lancet of 43, further comprising:

the needle withdrawing key (6) is arranged on the tail cap bullet wall (501) in a sliding mode in the axial direction, and based on the preset sliding of the needle withdrawing key (6) in the axial direction, the needle withdrawing action of the blood sampling pen is triggered.

46. The lancet of 43, further comprising:

a needle withdrawing rod (3);

wherein:

47. The lancet of 43, further comprising:

a cap (1) provided with a cap hole (104) adapted to insert the lancet (12);

a housing (4) having a first stopper (409) provided on an inner wall thereof;

a needle withdrawing rod (3),

wherein:

48. The lancet of 43, further comprising:

a housing (4), the tail cap (5) disposed at a distal end of the housing (4);

a tail cap inner core (7) at least partially disposed within the tail cap (5);

49. A blood collection pen comprising:

50. The lancet of 49, further comprising:

a tail cap inner core (7) at least partially disposed within the tail cap (5);

a blocking piece (8) arranged inside the tail cap inner core (7);

a needle withdrawing rod (3);

wherein:

51. The lancet of 50, further comprising:

wherein:

52. The lancet of 49, wherein,

53. The lancet of 49, further comprising:

a needle withdrawing rod (3);

wherein:

54. The lancet of 49, further comprising:

a cap (1) provided with a cap hole (104) adapted to insert the lancet (12);

a housing (4) having a first stopper portion (409) provided on an inner wall thereof;

a needle withdrawing rod (3),

wherein:

the first elastic arm (212) is suitable for abutting against the first limiting part (409) when in the first radial position so as to prevent the needle core (2) from moving towards the far end to a state to be launched, and is suitable for disengaging from the first limiting part (409) when in the second radial position.

55. The lancet of 49, further comprising:

a housing (4), the tail cap (5) disposed at a distal end of the housing (4);

a tail cap inner core (7) at least partially disposed within the tail cap (5);

56. A blood collection pen comprising:

a needle withdrawing rod (3);

wherein:

57. The lancet of 56, further comprising:

a housing (4) including a second pressing portion (410); at least a portion of the stylet (2) is disposed inside the housing (4);

in the process that the stylet (2) moves towards the far end to be launched, the second extrusion part (410) extrudes the elastic part (300) to deform, so that the blocking part (205) is abutted against the elastic part (300).

58. The lancet of claim 57, wherein,

59. The lancet of 58, further comprising:

60. The lancet of claim 59, wherein,

61. The lancet of 56, further comprising:

62. The lancet of claim 61, further comprising: a second elastic member (10);

63. The lancet of 56, further comprising:

the needle withdrawing key (6) is slidably arranged on the tail cap elastic wall (501) in the axial direction, and based on the preset movement of the needle withdrawing key (6) in the axial direction, the needle withdrawing action of the blood sampling pen is triggered.

64. The lancet of 63, further comprising:

a tail cap inner core (7) at least partially disposed within the tail cap (5);

a blocking piece (8) arranged inside the tail cap inner core (7);

wherein:

65. The lancet of claim 64, wherein,

the distal end surface of the stylet (2) is abutted against the distal end surface of the blocking part (8), and the needle withdrawing rod (3) is connected with the stylet (2);

66. The lancet of claim 63, wherein,

67. The lancet of 56, further comprising:

a cap (1) provided with a cap hole (104) adapted to insert the lancet (12);

a housing (4) having a first stopper (409) provided on an inner wall thereof;

wherein:

68. The blood collection pen of claim 67, wherein,

the needle withdrawing rod (3) comprises a first pressing part (303);

69. The lancet of 68, wherein,

the needle core (2) further comprises a connecting plate (220), and the connecting plate (220) is connected with the first elastic arm (212) and is arranged on one side, close to the axial direction of the blood sampling pen, of the first elastic arm (212);

70. The blood collection pen of claim 69, wherein,

71. The blood collection pen of claim 67, wherein,

72. The lancet of 56, further comprising:

a housing (4);

a tail cap (5) disposed at a distal end of the housing (4);

a tail cap inner core (7) at least partially disposed within the tail cap (5);

73. The lancet of claim 72, wherein,

74. The blood collection pen of claim 72, wherein,

75. The lancet according to 72, wherein the needle core (2) is arranged inside the housing (4) and extends into the interior of the tail cap core (7), wherein,

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. A lancet, comprising:

a pen cap (1) provided with a pen cap hole (104) adapted to insert the blood collection needle (12);

a housing (4) having a first stopper (409) provided on an inner wall thereof;

a needle withdrawing rod (3),

wherein:

2. The lancet of claim 1,

the needle withdrawing rod (3) comprises a first extrusion part (303);

3. The lancet of claim 2,

4. The lancet of claim 3,

5. The lancet according to any one of claims 1 to 4,

6. The lancet of claim 1,

7. The lancet of claim 1, wherein the lancet further comprises:

a tail cap (5) disposed at a distal end of the housing (4);

a tail cap inner core (7) at least partially disposed within the tail cap (5);

8. The lancing pen according to claim 7,

the inner wall of the tail cap (5) is provided with a second protrusion (506), the outer wall of the tail cap inner core (7) is provided with a spiral second guide structure (701), and the second protrusion (506) is suitable for being matched with the second guide structure (701), so that the tail cap inner core (7) can rotate relative to the tail cap (5) and simultaneously generate axial displacement.

9. The lancing pen according to claim 7,

10. The lancet of claim 7,

11. The lancet of claim 1, further comprising:

12. The lancet of claim 11, further comprising: a second elastic member (10);

13. The lancet of claim 1, further comprising:

a tail cap (5) comprising a tail cap bullet wall (501) extending along the axial direction of the blood collection pen;

14. The lancet of claim 13, further comprising:

a tail cap inner core (7) at least partially disposed within the tail cap (5);

a blocking piece (8) arranged inside the tail cap inner core (7);

wherein:

when the needle withdrawing key (6) moves axially towards the near end, the needle withdrawing rod (3) is pushed to move axially towards the near end until the blocking piece (8) is abutted against the tail cap inner core (7), and the needle withdrawing action of the blood sampling pen is triggered.

15. The lancet of claim 14,

16. The lancet of claim 13,

17. The lancet of claim 1,

at least a portion of the stylet (2) is disposed inside the housing (4);

19. The lancet of claim 18,

in the process that the needle withdrawing rod (3) moves towards the near end to a needle withdrawing state, the second extrusion part (410) is separated from the elastic part (300), and the elastic part (300) is restored to an undeformed state, so that the blocking part (205) is separated from the elastic part (300).

20. The lancet of claim 19, further comprising:

21. The lancet of claim 20,

22. A lancet, comprising:

a housing (4);

a tail cap (5) disposed at a distal end of the housing (4);

a tail cap inner core (7) at least partially disposed within the tail cap (5);

23. The lancet of claim 22,

24. The lancet of claim 22,

25. The lancet of claim 22, further comprising:

wherein, the first and the second end of the pipe are connected with each other,

26. The lancet of claim 22, further comprising:

a cap (1) provided with a cap hole (104) adapted to insert the lancet (12);

a needle withdrawing rod (3),

wherein:

27. The lancet of claim 26,

the needle withdrawing rod (3) comprises a first pressing part (303);

28. The lancet of claim 27,

29. The lancet of claim 28,

30. The lancet according to any one of claims 26 to 29,

31. The lancet of claim 26,

33. The lancet of claim 32, further comprising:

a second elastic element (10),

34. The lancet of claim 22, the tail cap (5) comprising a tail cap bullet wall (501) extending in an axial direction of the lancet;

35. The lancet of claim 34, further comprising:

a blocking piece (8) arranged inside the tail cap inner core (7);

a needle withdrawing rod (3);

wherein:

36. The lancet of claim 35, further comprising:

wherein:

37. The lancet of claim 34,

38. The lancet of claim 22, further comprising:

a needle withdrawing rod (3);

wherein:

39. The lancing pen according to claim 38, the housing (4) comprising a second pressing portion (410); at least a portion of the stylet (2) is disposed inside the housing (4);

40. The lancet of claim 39,

41. The lancet of claim 40, further comprising:

42. The lancet of claim 41,

43. A lancet, comprising:

a tail cap (5) comprising a tail cap elastic wall (501) extending along the axial direction of the blood sampling pen,

wherein: the tail cap bullet wall (501) is provided with a launching part (504), and the launching part (504) is suitable for triggering the blood sampling action of the blood sampling pen when the tail cap bullet wall (501) is pressed.

44. The lancet of claim 43, further comprising:

a second elastic element (10) which is provided with a first elastic element,

45. The lancet of claim 43, further comprising:

46. The lancet of claim 43, further comprising:

a needle withdrawing rod (3);

wherein:

47. The lancet of claim 43, further comprising:

a cap (1) provided with a cap hole (104) adapted to insert the lancet (12);

a housing (4) having a first stopper (409) provided on an inner wall thereof;

a needle withdrawing rod (3),

wherein:

48. The lancet of claim 43, further comprising:

a housing (4), the tail cap (5) disposed at a distal end of the housing (4);

a tail cap inner core (7) at least partially disposed within the tail cap (5);

wherein the rotation of the tail cap rotor (9) is adapted to drive the tail cap inner core (7) to move axially to adjust the puncture depth of the lancet (12).

49. A lancet, comprising:

50. The lancet of claim 49, further comprising:

a tail cap inner core (7) at least partially disposed within the tail cap (5);

a blocking piece (8) arranged inside the tail cap inner core (7);

a needle withdrawing rod (3);

wherein:

51. The lancet of claim 50, further comprising:

wherein:

move back needle key (6) and carry out axial displacement towards the near-end when, promote move back needle bar (3) and carry out axial displacement towards the near-end, and drive nook closing member (2) carry out axial displacement towards the near-end, until the near-end face that stops piece (8) with during the near-end face butt of tail cap inner core (7), block nook closing member (2) continue to move towards the near-end, make move back needle bar (3) will blood taking needle (12) are followed push out in needle file (213).

52. The lancet of claim 49,

53. The lancet of claim 49, further comprising:

a needle withdrawing rod (3);

wherein:

the stylet (2) comprises a blocking portion (205), the needle withdrawing rod comprises an elastic portion (300), the blood taking needle (12) is in a state of waiting for emission, the blocking portion (205) is abutted to the elastic portion (300) to prevent the needle withdrawing rod (3) from triggering the needle withdrawing action of the blood taking pen.

54. The lancet of claim 49, further comprising:

a cap (1) provided with a cap hole (104) adapted to insert the lancet (12);

a housing (4) having a first stopper (409) provided on an inner wall thereof;

a needle withdrawing rod (3),

wherein:

55. The lancet of claim 49, further comprising:

a housing (4), the tail cap (5) disposed at a distal end of the housing (4);

a tail cap inner core (7) at least partially disposed within the tail cap (5);

56. A lancet, comprising:

a needle withdrawing rod (3);

wherein:

57. The lancet of claim 56, further comprising:

58. The lancet of claim 57,

59. The lancet of claim 58, further comprising:

60. The lancet of claim 59,

61. The lancet of claim 56, further comprising:

62. The lancet of claim 61, further comprising: a second elastic member (10);

63. The lancet of claim 56, further comprising:

64. The lancet of claim 63, further comprising:

a tail cap inner core (7) at least partially disposed within the tail cap (5);

a blocking piece (8) arranged inside the tail cap inner core (7);

wherein:

65. The lancet of claim 64,

66. The lancing pen of claim 63,

67. The lancet of claim 56, further comprising:

a cap (1) provided with a cap hole (104) adapted to insert the lancet (12);

a housing (4) having a first stopper (409) provided on an inner wall thereof;

wherein:

68. The lancet of claim 67,

the needle withdrawing rod (3) comprises a first extrusion part (303);

69. The lancet of claim 68,

the connecting plate (220) is provided with a first guide structure (207), and the first pressing part (303) is suitable for moving in the first guide structure (207) to press the first elastic arm (212) to deform in the direction away from or close to the axis of the blood sampling pen.

70. The lancing pen of claim 69,

71. The lancet of claim 67,

72. The lancet of claim 56, further comprising:

a housing (4);

a tail cap (5) disposed at a distal end of the housing (4);

a tail cap inner core (7) at least partially disposed within the tail cap (5);

73. The lancet of claim 72,

74. The lancet of claim 72,

75. The lancet according to claim 72, wherein the needle core (2) is arranged inside the housing (4) and extends into the interior of the rear cap inner core (7), wherein,