CN111419246B

CN111419246B - Blood sampling pen

Info

Publication number: CN111419246B
Application number: CN202010225018.7A
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: 2020-03-26
Filing date: 2020-03-26
Publication date: 2023-06-20
Anticipated expiration: 2040-03-26
Also published as: CN111419246A

Abstract

The invention relates to a blood sampling pen, comprising: a housing; the needle seat is arranged in the shell and is suitable for mounting the blood taking needle; the driving core body is suitable for driving the needle seat; a baffle is arranged between the first end and the second end of the tail cap core body, the baffle is provided with a first blocking surface close to the front end of the blood sampling pen and a second blocking surface opposite to the first blocking surface, and the baffle is also provided with a first through hole for the tail of the driving core body to pass through; the second end of the tail cap core body is arranged in the tail cap, and the tail cap can axially move relative to the tail cap core body; a drive spring adapted to drive the core; a reset spring adapted to reset the driving core toward the rear end of the blood sampling pen, wherein: the driving spring and the reset spring are respectively arranged at two sides of the baffle plate; the tail end of the driving core body is provided with a blocking part, and the reset spring is suitable for applying elasticity to the blocking part in the direction towards the rear end of the blood sampling pen; the blocking part is provided with an extending part extending towards the axial direction of the second blocking surface, and the extending part is suitable for abutting against the second blocking surface.

Description

Blood sampling pen

Technical Field

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

Background

The known lancet comprises a lancet housing and a head cap, and the lancet is mounted in the lancet housing. The headgear includes: a headgear housing; the connecting cylinder is rotatably connected with the head cap shell relative to the connecting cylinder; the head cap core body is arranged in a space formed by the head cap shell and the connecting cylinder, and based on the rotation of the head cap shell body, the head cap core body rotates and moves along the longitudinal center line at the same time, and the head cap core body is provided with a blocking surface for limiting the penetration depth of the blood taking needle.

The adjustment of the relative penetration depth of the lancet generally depends on the increase or decrease of the clearance between the blocking surface of the cap driving core and the cap housing to control the penetration length of the lancet after the cap driving core moves axially in the space formed by the cap housing and the connecting tube.

The penetration depth of the blood taking needle of the known blood taking pen can be adjusted, but the same elasticity can not meet the requirements of low pain and sufficient blood taking amount for people with different skin types. In addition, the lancet is easy to shake in the process of lancing, and the pain of a user is increased. In addition, the known lancet has a relatively complicated structure for adjusting the penetration depth of the lancet.

Disclosure of Invention

The present invention is directed to alleviating or solving at least one of the problems discussed above.

According to an aspect of an embodiment of the present invention, the present invention proposes a lancing pen comprising:

a housing;

the needle seat is arranged in the shell and is suitable for mounting the blood taking needle;

a drive core adapted to drive the hub;

the tail cap comprises a tail cap core body, a baffle is arranged between a first end and a second end of the tail cap core body, the baffle is provided with a first blocking surface close to the front end of the blood sampling pen and a second blocking surface opposite to the first blocking surface, and the baffle is also provided with a first through hole for the tail of the driving core body to pass through;

the second end of the tail cap core body is arranged in the tail cap, and the tail cap can axially move relative to the tail cap core body;

a driving spring, adapted to provide a trigger elastic force for driving the core towards the front end of the lancet;

a reset spring which is suitable for resetting the driving core body towards the rear end of the blood sampling pen,

wherein:

the driving spring and the reset spring are respectively arranged at two sides of the baffle plate;

the tail end of the driving core body is provided with a blocking part, and the reset spring is suitable for applying elasticity to the blocking part in the direction towards the rear end of the blood sampling pen; and is also provided with

The blocking portion has an extension extending axially towards the second blocking surface, the extension being adapted to abut the second blocking surface.

Drawings

These and other features and advantages of the various embodiments of the disclosed invention will be better understood from the following description taken in conjunction with the accompanying drawings, in which like reference characters designate like parts throughout the several views, and wherein:

FIGS. 1-1 to 1-4 are front, A-A cross-sectional, top, and right views, respectively, of a headgear of a lancing pen according to an exemplary embodiment of the present invention;

FIGS. 2-1 to 2-2 are front views, A-A cross-sectional views, respectively, of a cap core of a lancet according to an exemplary embodiment of the present invention;

fig. 3 is a schematic view of a hub return spring disposed between the headgear and the guide cylinder;

fig. 4-1 to 4-5 are front, top, A-A cross-sectional, right and perspective views, respectively, of a guide sleeve of a lancet according to an exemplary embodiment of the present invention;

FIGS. 5-1 to 5-6 are front, top, A-A cross-sectional, right and left views, respectively, of a housing of a lancing pen according to an exemplary embodiment of the present invention;

fig. 6-1 to 6-3 are front, H-H cross-sectional, and perspective views, respectively, of a hub of a lancet according to an exemplary embodiment of the present invention;

FIGS. 7-1 to 7-2 are top and bottom views, respectively, of an emission key of a lancet according to an exemplary embodiment of the present invention;

fig. 8 is a front view of a withdrawal key of the lancet according to an exemplary embodiment of the present invention;

fig. 9-1 to 9-3 are front, top and perspective views, respectively, of a driving core or inner core of a lancet according to an exemplary embodiment of the present invention;

FIGS. 10-1 to 10-4 are A-A cross-sectional, front, top and perspective views, respectively, of a rear cap inner core of a lancet according to an exemplary embodiment of the present invention;

FIGS. 11-1 to 11-3 are front, A-A cross-sectional and right side views, respectively, of a flap-or blocking engagement portion of a lancing pen according to an exemplary embodiment of the present invention;

FIGS. 12-1 to 12-2 are front and perspective views, respectively, of a second or blocking portion of a lancet according to an exemplary embodiment of the present invention;

FIGS. 13-1 to 13-3 are front, A-A cross-sectional and perspective views, respectively, of a tail cap of a lancet according to an exemplary embodiment of the present invention;

fig. 14 is a cross-sectional view of a driving spring of a lancet according to an exemplary embodiment of the present invention in a pre-pressed state;

fig. 15 is a cross-sectional view illustrating an excited state when an elastic force of a driving spring of a lancet and a penetration depth are maximized according to an exemplary embodiment of the present invention;

fig. 16 is a cross-sectional view illustrating an excited state when the elastic force of a driving spring and the penetration depth of a lancet are minimized according to an exemplary embodiment of the present invention; and

fig. 17 illustrates how the tail cap inner core mates with the outer shell.

Detailed Description

The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of embodiments of the present invention with reference to the accompanying drawings is intended to illustrate the general inventive concept and should not be taken as limiting the invention.

The structure and installation of a lancet according to an exemplary embodiment of the present invention will be described below with reference to the accompanying drawings. It should be noted that some of the features or components in some of the drawings are not specifically shown for clarity.

1-1 to 1-4 illustrate a cap 10 of a lancet, 2-1 to 2-2 illustrate a cap inner core 20 of a lancet, 4-1 to 4-5 illustrate a guide sleeve 40 of a lancet, 5-1 to 5-6 illustrate a housing 50 of a lancet, 6-1 to 6-3 illustrate a hub 60 of a lancet, 9-1 to 9-3 illustrate a drive core or inner core 90 of a lancet, 10-1 to 10-4 illustrate a tail cap inner core 110 of a lancet, 11-1 to 11-3 illustrate a first stop or stop mating portion 130 of a lancet, 12-1 to 12-2 illustrate a second stop or stop portion 140 of a lancet, 13-1 to 13-3 illustrate a tail cap 160 of a lancet, and 14 is a cross-sectional view illustrating a pre-compressed state of a drive spring of a lancet; fig. 15 is a cross-sectional view illustrating an excited state when the elastic force of a driving spring of the lancet is maximized; fig. 16 is a cross-sectional view illustrating an excited state when the elastic force of the drive spring of the lancet and the penetration depth are minimized.

As shown in the drawings, the needle holder 60 includes a needle holder groove 61 for fixing the lancet 170 (see fig. 14); the first guide rib 62 may be inserted into the first guide slot 41 (see fig. 4-3) until the second locating surface 64 contacts the third locating surface 42 (see fig. 4-3).

As shown in fig. 2-2, the pen cap inner core 20 is a hollow shell, one end is provided with a needle outlet 24, an annular rib 21 is arranged in the pen cap inner core, the annular rib 21 is axially divided into a plurality of independent small pieces, the inner ends of the small pieces are provided with protrusions or protruding points 25, the inner diameter surrounded by the protruding points 25 is slightly smaller than the outer diameter of the needle seat groove 61, the needle seat groove 61 is contacted with the protruding points 25 in the excitation process, the elasticity of plastic material can allow the needle seat 60 to pass through without occurrence or reduction of circumferential shaking, and as can be understood by a person skilled in the art, the protruding points 25 and the annular rib are divided into a plurality of small pieces, so that the annular rib can be deformed in the radial direction. The spring 30 (see fig. 3 and 14) is installed in the cap inner core 20, the circumferential position of the spring 30 is controlled by the annular rib 21 and the inner side wall of the cap inner core 20, the second end face 22 of the cap inner core 20 installed with the spring 30 is pressed against the third positioning face 42 of the guide sleeve 40 until the second end face 22 abuts against the third positioning face 42, at the moment, the positioning rib 23 is in interference fit with the first positioning groove 43, and the cap inner core 20 is fixedly connected with the guide sleeve 40 installed in the needle seat 60.

The head cap 10 comprises a needle outlet 11 which allows the blood taking needle to pass through when the blood taking needle is assembled and disassembled; the hanging table 12 can be sleeved on the guide sleeve 40 through the notch 45 until the first end face 14 is contacted with the fourth positioning face 411, and at the moment, the arrow sign on the helmet 10 corresponds to the triangle sign of the main body 50, so that the helmet can be assembled and disassembled when in the position; then the head cap 10 is rotated clockwise, the hanging table 12 firstly straddles the second positioning groove 46, and at the moment, the stop block 13 (see fig. 1-1) and the needle withdrawing key 80 (see fig. 8) are in a staggered state in the axial position, so that the needle withdrawing key 80 can move towards the direction of a needle outlet to realize the needle withdrawing function, and the head cap 10 is positioned at the needle withdrawing position; continuing to rotate the helmet 10 clockwise, the hanging table 12 straddles the third positioning groove 47, at this time, the stop 13 is opposite to the axial position of the needle withdrawing key 80, the needle withdrawing key 80 is locked, and the helmet is in locking position. It should be noted that the notch 45, the second positioning slot 46 and the third positioning slot 47 are separated by a longitudinal rib, so that the three are relatively independent, and the hanging table 12 needs manual operation to switch positions therebetween.

As shown in fig. 7-1 and 7-2, the key 70 includes a rim portion 71 and a trigger portion 72, the rim portion 71 being housed in the housing 50, the trigger portion 72 being exposed through the key hole 55, see fig. 14.

The assembly of the pen cap and the guide barrel is assembled with the shell 50 with the keys 70, the assembly groove 48 faces the assembly rib 52, one side of the positioning surface six 49 is the same as the transmitting key, and the guide sleeve is sleeved in the shell until the positioning surface five 44 is abutted with the front end surface 53. The inside of the main body 50 is provided with a first separation sheet 56, the first separation sheet 56 is provided with a special-shaped through hole 57 for the inner core 90 to longitudinally pass through, the matched part of the special-shaped through hole 57 and the tail 92 is smaller than a large-diameter part 92A on the tail 92, and the inner core 90 is prevented from continuously moving forwards in the process of moving towards the needle outlet direction in the axial direction; four longitudinal ribs are arranged at the edge of the special-shaped through hole 57 matched with the second guide rib 91 towards the direction of the needle outlet, so that two second guide grooves 58 are formed, and the axial dimension of the two guide grooves is enough to enable the inner core 90 to reciprocate in the guide grooves during the excitation process as shown in fig. 5-3.

The front end of the inner core 90 is provided with a first transmission surface 97 which is in contact with the force bearing surface 65 in a free state so as to drive the needle seat 60 to move simultaneously when excited until the inner core is forced to stop.

Then, the second spring 120 is sleeved on the tail 92, and is connected with the main body 50 in a rotating way through the threaded rib 113 and the threaded groove 59, the tail 92 penetrates through the tail cap inner core through the through hole 112, and the second spring 120 is controlled between the first blocking surface 115 and the control surface 93. When the tail cap inner core rotates in the direction away from the needle outlet, the distance between the first blocking surface 115 and the control surface 93 is increased, and the space where the second spring 120 is positioned is axially enlarged; when the tail cap inner core rotates in the direction close to the needle outlet, the distance between the first blocking surface 115 and the control surface 93 is reduced, and the space where the second spring 120 is located is axially reduced. When rotated until stop face three 117 and stop face four 512 meet, the tail cap inner core cannot continue to rotate away from the needle outlet as shown in fig. 17. Guide groove five 114 in one embodiment, guide groove five 114 comprises two parts, is close to the shell part and is the straight groove that both sides are parallel, cooperates with guide rib five 162 and plays direction and transmission effect, and the part that keeps away from the shell is loudspeaker-shaped, breaks away from with guide rib five 162 when back draws the tail cap to avoid unexpected rotation tail cap inner core, lead to puncture dynamics and degree of depth change. The first flap 130 is provided with a through hole 136 through which the core 90 passes. As can be appreciated by those skilled in the art, in the case where the second blade 140 and the first blade 130 integrally rotate in the circumferential direction, in the case where the first blade 130 rotates with the tail cap 160, the second blade 140 is also rotated, and at this time, the second blade 140 can rotate with respect to the tail end of the driving core 90, so that the driving core 90 is not driven to rotate.

Before installing the first baffle 130, the tail cap inner core 110 is rotated to the most distal end, an opening 134 (the opening 134 is convenient for the second baffle 140 to be sleeved on the tail 92) and the needle outlet are reversely sleeved on the tail 92, and then the third spring 150 is sleeved on the tail 92; then, the third guide groove 142 is opposite to the third guide groove 132 by the supporting rib 141 corresponding to the second through hole 131, the second baffle 140 is sleeved on the tail 92 until the second baffle 140 is axially fixed by the clamping groove 94, and the third guide groove 132 drives the second baffle 140 to rotate simultaneously when the tail cap is rotated, so that the supporting rib 141 always corresponds to the second through hole 131; the third spring 150 is limited between the first blocking piece 130 and the second blocking piece 140, and the first blocking piece 130 is always kept at the position closest to the second blocking surface 116 under the action of the elastic force of the third spring 150 due to the fixed relative position of the third blocking piece 140 and the inner core 90.

One end of the tail cap 160 is provided with an open hollow shell, an annular rib II 163 is arranged in the hollow shell, and the distance from the axial end surface 165 (namely a plane II) to the end surface III 164 is equal to the distance moved when the tail cap inner core 110 rotates to the farthest end from the needle outlet; mounting the first flap 130 to the tail cap 160 with the fourth guide rib 161 against the fourth guide slot 133 until the first plane 135 and the second plane 165 simultaneously contact the second blocking plane 116 (the tail cap core 110 has been rotated to the most distal end); the inner diameter of the annular rib II 163 is smaller than the outer diameter of the first baffle 130, and the annular rib II and the baffle 130 are sleeved together in an interference fit mode, so that the tail cap 160 and the first baffle 130 are always synchronous, that is, the axial movement of the tail cap inner core 110 does not affect the relative position of the tail cap 160 and the outer shell 50.

The main pushing surface 81 of the needle withdrawing key 80 is in the same direction as the needle outlet, the cross-shaped rib where the main pushing surface 81 is positioned is pressed against the cross groove 510, the hanging table 82 passes over the boss 410 in the process of resetting the needle withdrawing key 80 after withdrawing the needle, and the needle withdrawing key is reminded to reset through the change of hand feeling.

The operation of the lancet according to the exemplary embodiment of the present invention will be described below with reference to the accompanying drawings. It should be noted that some of the features or components in some of the drawings are not specifically shown for clarity.

When blood collection is prepared, the tail cap 160 is rotated firstly, the tail cap inner core 110 is driven to rotate along the thread groove 59 through the matching of the guide rib IV 161 and the guide groove IV 114, the tail cap 160 is stopped at a proper position, and numbers representing different blood collection depths and forces on the tail cap correspond to the marks 511 on the shell. Then, a blood taking needle is arranged, and the blood taking needle 170 is arranged through the needle outlet 11 and fixed in the needle seat groove 61; then, the tail cap 160 is pulled away from the needle outlet, driving the inner core 90 to move backward, causing the top surface 95 to bear against the positioning surface six 49, and the firing spring two 120 is compressed, as shown in fig. 14.

Pressing the emission key 70, pushing the trigger surface 96 by the contact 73 to enable the top surface 95 to be separated from the positioning surface six 49, pushing the inner core 90 to move towards the needle outlet direction by the emission spring two 120, driving the baffle two 140 to move simultaneously by the inner core 90, stopping when the support rib 141 penetrates through the through hole two 131 to collide with the baffle two 116, and stopping when the tail cap inner core moves towards the direction far away from the needle outlet, the support rib 141 can collide with the baffle two 116 earlier, so that the distance of pushing the needle seat 60 by the inner core 90 is reduced, the lancing distance and strength of the blood taking needle are reduced, and otherwise, the lancing distance and strength are increased simultaneously; the distance between the second blocking surface 116 of the inner core of the tail cap and the end surface 135 of the first blocking tab 130 gradually decreases from L (see fig. 15) to abut against each other during this process.

After blood collection, the needle seat reset spring 30 pushes the needle seat to reset, the pen cap is rotated to the needle withdrawing position 15, the needle withdrawing key 80 is pushed to withdraw and discard the blood collection needle, the pen cap is rotated to the cap withdrawing position 16, the pen cap is removed for disinfection and cleaning, and then the pen cap is installed and rotated to the locking position 14.

Because the distance of the blood taking needle is not controlled by the pen cap, only the inner core of the pen cap can take blood after the pen cap is taken down. Alternatively, the pen cap can be designed as a non-detachable pen cap, and an inner core of the pen cap is omitted.

In the above embodiment of the present invention, since the compression of the second spring 120 is limited by the control surface 93 and the first blocking surface 115, when the tail cap 160 is rotated, the guide rib five 162 drives the screw rib 113 of the tail cap inner core 110 to rotate along the screw groove 59, and when the third blocking surface 117 is in close contact with the fourth blocking surface 512, the tail cap inner core 110 is at the far end, the second spring 120 is limited by the control surface 93 and the first blocking surface 115, the compression amount of the spring is minimum, the elastic force is minimum, and the exposed distance of the needle tip is minimum; when the tail cap core 110 is rotated to the stop face five 513 of the hook 118, the tail cap core 110 is at the far end, the second spring 120 is limited by the control face 93 and the first stop face 115, the compression amount of the driving spring is maximum, the elastic force is maximum, and the exposed distance of the needle tip is maximum.

By adjusting the spring force of the second spring 120, the needle-out speed can be adjusted. Generally, the faster the needle is withdrawn, the less painful the user is, regardless of other factors.

In the embodiment of the invention, when the needle seat 60 axially reciprocates in the blood sampling process, the needle seat 60 moves stably through the deformation of the annular rib 21, so that the shaking of the blood sampling needle in the blood sampling process is reduced, and the pain of a user is reduced.

In the embodiment of the invention, the space formed between the annular rib 21 in the head cap core 20 and the shell of the head cap core 20 can accommodate part of the spring 30, so as to limit the circumferential shaking amount of the spring 30, which can reduce shaking of the blood taking needle in the blood taking process and reduce pain of a user.

In the embodiment of the invention, the adjustment of the penetration depth is realized by only adjusting the relative axial position between the tail cap and the shell, and compared with the prior art that the head cap is utilized to rotate to drive the head cap core body to rotate, the number of parts for realizing the penetration depth adjustment is reduced.

In the embodiment of the invention, the penetration depth adjustment and the driving elastic force adjustment are simultaneously arranged on the blood sampling pen, so that the pain of a user can be further reduced. The embodiment of the invention provides a blood taking pen with the penetration depth and the penetration force (speed) of a blood taking needle.

In the embodiment of the present invention, although the hub and the drive core are separate two components, it is within the scope of the present invention that they may be formed as one component.

Many variations are possible to the above described embodiments. For example:

only the tail cap core body can be arranged without arranging the tail cap shell, or the tail cap core body and the tail cap shell are integrated;

the component connected with the second end of the driving spring (in the invention, the end far away from the pinhole is the second end, and the end close to the pinhole is the first end) can be arranged to be capable of moving axially relative to the tail cap core body besides being fixedly connected with the tail cap core body;

the driving spring can provide driving force under the compression state or provide driving force under the extension state;

the axial distance between two ends of the driving spring or the axial distance between two connecting parts can be adjusted, threaded connection can be adopted, other modes can be adopted, including snap connection and the like, and the snap connection is equivalent to the threaded connection, so that the method falls into the protection scope of the claims of the invention;

under the condition that the penetration depth does not need to be adjusted by using the head cap, the blood sampling pen does not need to comprise the head cap, or the head cap is directly integrated with the shell of the blood sampling pen;

under the condition that the tail cap is not needed to be used for triggering the blood taking pen at the standby position, the tail cap is not needed to be arranged, or the tail cap is directly integrated with the shell of the blood taking pen;

the above variants are all within the scope of protection of the present invention.

The embodiment of the invention also provides a blood sampling pen, which comprises:

a housing 50;

a guide cylinder 40, the second end of which is cooperatively connected to the housing;

a head cap 10, a first end of which is provided with a needle outlet hole, and a second end of which is connected with the first end of the guide cylinder;

a needle stand 60 disposed in the housing, the needle stand being adapted to mount a lancet;

a needle withdrawal key 80 provided to the housing, the needle withdrawal key being adapted to move in an axial direction;

a drive core 90, said drive core being adapted to drive the needle mount,

wherein:

the inner wall of the helmet is provided with a hanging table 12, and the outer wall of the helmet is provided with a stop block 13;

the outer wall of the first end of the guide cylinder is provided with a notch 45 for the hanging table to axially enter, and a circumferential first positioning groove 46 and a circumferential second positioning groove 47 which are sequentially connected with the notch in the circumferential direction, wherein the notch, the circumferential first positioning groove and the circumferential second positioning groove are separated by a longitudinal spacing rib;

when the hanging table is positioned in the notch, the head cap is positioned at a position which can be removed from the shell; when the hanging table moves into the first positioning groove in the circumferential direction, the stop block and the needle withdrawing key are staggered in the axial direction, and the head cap is positioned at the needle withdrawing position; when the hanging table moves into the second positioning groove in the circumferential direction, the stop block is opposite to the needle withdrawing key in the axial direction, and the head cap is in a locking position.

Based on the above, the present invention proposes the following scheme:

1. a blood collection pen, comprising:

a housing;

a drive core adapted to drive the hub;

wherein:

2. The lancing pen of claim 1, wherein:

the driving core body is provided with a spring connecting part, and the driving spring is arranged between the spring connecting part and the first blocking surface;

the first end of the tail cap core is threadably connected to the second end of the housing and is adapted to adjust the axial position of the first blocking surface relative to the housing based on a threaded fit.

3. The lancing pen of claim 2, comprising:

the blocking matching part is provided with a second through hole and a third through hole, and the tail part of the driving core body penetrating through the first through hole is suitable for penetrating through the second through hole;

the reset spring is sleeved on the driving core body and arranged between the blocking matching part and the blocking part, and the extension part is suitable for penetrating through the third through hole to be abutted with the second blocking surface.

4. The lancing pen of claim 3, wherein:

the blocking engagement has a barrel structure, and the blocking portion is adapted to move into the barrel structure.

5. The lancing pen of claim 4, wherein:

an axial fit guide part is arranged between the blocking part and the blocking fit part; and is also provided with

The blocking portion is adapted to rotate relative to the trailing end of the drive core.

6. The lancing pen of claim 4, wherein:

the body of the blocking portion is in a cylindrical shape and the extending portion extends from the body of the blocking portion toward the blocking mating portion.

7. The lancing pen of claim 4, wherein:

the blocking matching part is fixedly connected with the tail cap in an integral mode.

8. The lancing pen of claim 7, wherein:

the tail cap is provided with an inner barrel body which is arranged at intervals with the side wall of the tail cap, and the inner wall of the inner barrel body is connected with the outer wall of the barrel body structure of the blocking matching part in an interference fit mode.

9. The lancing pen of claim 8, wherein:

a longitudinal groove and a longitudinal rib which extend longitudinally are arranged between the outer wall of the cylinder body structure of the blocking matching part and the inner wall of the inner cylinder body, and the longitudinal groove and the longitudinal rib are matched with each other.

10. The lancing pen of claim 1, wherein:

the tail cap is provided with an inner cylinder body which is arranged at intervals with the side wall of the tail cap;

the first end of the tail cap core body is in threaded connection with the second end of the shell, and the second end of the tail cap core body is a cylinder body and is suitable for being placed between the outer wall of the inner cylinder body of the tail cap and the side wall of the tail cap.

11. The lancing pen of claim 10, wherein:

a circumferential matching structure is arranged between the outer wall of the second end of the tail cap core body and the inner wall of the side wall of the tail cap, so that the tail cap core body is driven to rotate when the tail cap rotates.

12. The lancing pen of claim 11, wherein:

the outer wall of the second end of the tail cap core body is provided with a longitudinal guide groove;

the inner wall of the side wall of the tail cap is provided with a longitudinal bulge, and the longitudinal bulge is matched with the longitudinal guide groove.

13. The lancing pen of claim 12, wherein:

the longitudinal guide groove comprises a straight groove with parallel groove walls and an expansion groove connected with the straight groove, and the expansion groove gradually widens in the direction towards the rear end of the blood sampling pen.

14. The lancing pen of claim 10, wherein:

the end face of the inner cylinder body and the end face of the first end of the tail cap core are both located inside the tail cap core and are spaced from the end face of the tail cap core in the axial direction.

15. The lancing pen of claim 14, wherein:

the end face of the first end of the tail cap core body is flush with the end face of the inner cylinder body.

16. The lancet of any one of claims 1-15, comprising:

a guide cylinder, the second end of which is connected to the housing in a matched manner;

the first end of the head cap is provided with a needle outlet hole, and the second end of the head cap is connected with the first end of the guide cylinder.

17. The lancing pen of claim 16, wherein:

the inner wall of the helmet is provided with a hanging table, and the outer wall of the helmet is provided with a stop block;

the outer wall of the first end of the guide cylinder is provided with a notch for the hanging table to axially enter, and a circumferential first positioning groove and a circumferential second positioning groove which are sequentially connected with the notch in the circumferential direction, wherein the notch, the circumferential first positioning groove and the circumferential second positioning groove are separated by a longitudinal spacing rib;

the blood sampling pen further comprises a needle withdrawing key arranged on the shell, wherein the needle withdrawing key is suitable for moving in the axial direction;

18. The lancing pen of claim 16, wherein:

the helmet further comprises a helmet core body arranged in the helmet, and the second end of the helmet core body is sleeved on the first end of the guide cylinder;

the first end of the head cap core body is provided with a head cap core body needle outlet hole aligned with the needle outlet hole and annular ribs arranged around the head cap core body needle outlet, the annular ribs are formed by a plurality of pieces which are mutually spaced in the circumferential direction, and the inner side of each piece is provided with a bulge;

the needle seat is provided with a needle seat groove, the inner diameter defined by the bulge is smaller than the outer diameter of the needle seat groove, and the needle seat groove is suitable for being placed into the accommodating space defined by the annular rib.

19. The lancing pen of claim 18, wherein:

the second end of the head cap inner core is sleeved and connected into the first end of the guide cylinder;

a buckle connection structure is arranged between the outer wall of the second end of the head cap inner core and the inner wall of the first end of the guide cylinder.

20. The lancing pen of claim 1, wherein:

the needle seat and the driving core body are of an integrated structure.

21. The lancing pen of claim 1, wherein:

the tail cap core body and the tail cap are of an integrated structure.

Although embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.

Claims

1. A blood collection pen, comprising:

a housing (50);

a needle stand (60) which is arranged in the shell and is suitable for mounting a blood taking needle;

a drive core (90) adapted to drive the needle mount;

a tail cap core (110), a baffle (111) is arranged between a first end and a second end of the tail cap core, the baffle is provided with a first blocking surface (115) close to the front end of the blood sampling pen and a second blocking surface (116) opposite to the first blocking surface, and the baffle is also provided with a first through hole (112) for the tail of the driving core to pass through;

a driving spring (120) adapted to provide a trigger elastic force for driving the core toward the front end of the lancet;

a return spring (150) which is suitable for resetting the driving core body towards the rear end of the blood sampling pen,

wherein:

the tail end of the driving core body is provided with a blocking part (140), and the reset spring is suitable for applying elasticity to the blocking part in the direction towards the rear end of the blood sampling pen; and is also provided with

The blocking portion has an extension (141) extending axially towards the second blocking surface, said extension being adapted to abut the second blocking surface (116).

2. The lancing pen of claim 1, wherein:

the driving core body is provided with a spring connecting part (93), and the driving spring is arranged between the spring connecting part and the first blocking surface;

3. The lancing pen of claim 2, comprising:

a blocking engagement portion (130) having a second through hole (136) through which the tail portion of the driving core passing through the first through hole is adapted to pass;

the reset spring is sleeved on the driving core body and arranged between the blocking matching part and the blocking part, and the extension part is suitable for penetrating through the third through hole to be abutted with the second blocking surface (116).

4. The lancing pen of claim 3, wherein:

5. The lancing pen of claim 4, wherein:

an axial fit guide portion (132 and 142) is arranged between the blocking portion and the blocking fit portion; and is also provided with

6. The lancing pen of claim 4, wherein:

7. The lancing pen of claim 4, wherein:

8. The lancing pen of claim 7, wherein:

the tail cap is provided with an inner cylinder (163) which is arranged at intervals with the side wall of the tail cap, and the inner wall of the inner cylinder is in interference fit connection with the outer wall of the cylinder structure of the blocking matching part.

9. The lancing pen of claim 8, wherein:

a longitudinal groove (133) and a longitudinal rib (161) which extend longitudinally are arranged between the outer wall of the cylinder body structure of the blocking matching part and the inner wall of the inner cylinder body, and the longitudinal groove and the longitudinal rib are matched with each other.

10. The lancing pen of claim 1, wherein:

the tail cap is provided with an inner barrel (163) spaced from the side wall of the tail cap;

11. The lancing pen of claim 10, wherein:

12. The lancing pen of claim 11, wherein:

the outer wall of the second end of the tail cap core body is provided with a longitudinal guide groove (114);

the inner wall of the side wall of the tail cap is provided with a longitudinal protrusion (162), and the longitudinal protrusion is matched with the longitudinal guide groove.

13. The lancing pen of claim 12, wherein:

14. The lancing pen of claim 10, wherein:

the end face (165) of the inner barrel and the end face (135) of the first end of the tail cap core are both located inside the tail cap core and spaced apart from the end face (164) of the tail cap core in the axial direction.

15. The lancing pen of claim 14, wherein:

an end face (135) of the first end of the tail cap core is flush with an end face (165) of the inner barrel.

16. The lancing pen according to any one of claims 1-15, comprising:

a guide cylinder (40) having a second end cooperatively coupled to the housing;

and the first end of the head cap (10) is provided with a needle outlet hole, and the second end of the head cap is connected with the first end of the guide cylinder.

17. The lancing pen of claim 16, wherein:

the inner wall of the helmet is provided with a hanging table (12) and the outer wall is provided with a stop block (13);

the outer wall of the first end of the guide cylinder is provided with a notch (45) for the hanging table to axially enter, and a circumferential first positioning groove (46) and a circumferential second positioning groove (47) which are sequentially connected with the notch in the circumferential direction, wherein the notch, the circumferential first positioning groove and the circumferential second positioning groove are separated by a longitudinal spacing rib;

the lancet further comprises a needle withdrawal key (80) provided to the housing, the needle withdrawal key being adapted to move in an axial direction;

18. The lancing pen of claim 16, wherein:

the headgear also includes a headgear core (20) disposed therein, the second end of the headgear core being sleeved to the first end of the guide cylinder;

the first end of the helmet core is provided with a helmet core pin outlet hole (24) aligned with the pin outlet hole, and an annular rib (21) arranged around the helmet core pin outlet, wherein the annular rib is formed by a plurality of pieces which are mutually spaced in the circumferential direction, and the inner side of each piece is provided with a bulge (25);

the hub has a hub groove (61) with an inner diameter defined by the projection that is smaller than an outer diameter of the hub groove, and the hub groove is adapted to be placed into the receiving space defined by the annular rib.

19. The lancing pen of claim 18, wherein:

a snap connection (23, 43) is provided between the outer wall of the second end of the headgear core and the inner wall of the first end of the guide cylinder.

20. The lancing pen of claim 1, wherein:

the needle seat (60) and the driving core body (90) are of an integrated structure.

21. The lancing pen of claim 1, wherein:

the tail cap core (110) and the tail cap (160) are of an integrated structure.