CN111419246A

CN111419246A - Blood sampling pen

Info

Publication number: CN111419246A
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: 2020-07-17
Anticipated expiration: 2040-03-26
Also published as: CN111419246B

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 a blood taking needle; a drive core adapted to drive the needle mount; the tail cap core body is provided with a baffle between a first end and a second end, 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 part 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; reset spring is suitable for towards the rear end drive core that resets of blood sampling pen, wherein: the driving spring and the return spring are respectively arranged on two sides of the baffle; the tail end of the driving core body is provided with a blocking part, and the return spring is suitable for applying elastic force to the blocking part in the direction towards the rear end of the blood sampling pen; and the blocking part is provided with an extension part axially extending towards the second blocking surface, and the extension part is suitable for being abutted 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

Known lancets comprise a lancet housing in which a lancet is mounted and a cap. The head cap includes: a headgear housing; a connector barrel to which the headgear housing is rotatably connected relative to the connector barrel; the head cap core body is arranged in a space formed by the head cap shell and the connecting cylinder, and moves along the longitudinal central line while rotating based on the rotation of the head cap shell, and the head cap core body is provided with a blocking surface for limiting the puncture depth of the blood sampling needle.

The adjustment of the relative puncture depth of the blood taking needle of the blood taking pen generally depends on the increase and decrease of the clearance between the blocking surface of the head cap driving core body and the head cap shell to control the puncture length of the blood taking needle after the head cap driving core body axially moves in the space formed by the head cap shell and the connecting cylinder.

Although the puncture depth of the blood taking needle of the known blood taking pen can be adjusted, the same elasticity still cannot meet the requirements of low pain and sufficient blood taking quantity for people with different skin types. In addition, the blood taking needle is easy to shake in the process of pricking, and the pain of a user is increased. In addition, the known lancet pen has a relatively complicated structure for adjusting the puncture depth of the lancet.

Disclosure of Invention

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

According to an aspect of an embodiment of the present invention, there is provided a lancet, including:

a housing;

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

a drive core adapted to drive the needle hub;

the blood sampling pen comprises a tail cap core body, wherein 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 a driving core body to pass through;

a tail cap, the second end of the tail cap core being disposed within the tail cap, the tail cap being axially movable relative to the tail cap core;

the driving spring is suitable for providing triggering elastic force for the driving core body facing to the front end of the blood sampling pen;

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 return spring are respectively arranged on two sides of the baffle;

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

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

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, and in which:

FIGS. 1-1 to 1-4 are a front view, an A-A sectional view, a top view, and a right side view, respectively, of a tip cap of a lancet according to an exemplary embodiment of the present invention;

FIGS. 1-1 to 1-2 are respectively a front view, A-A direction cross-sectional view, of a cap core of a blood collection pen according to an exemplary embodiment of the present invention;

FIG. 3 is a schematic view of a needle hub return spring disposed between the headgear and the guide barrel;

FIGS. 4-1 to 4-5 are a front view, a plan view, a sectional view A-A, a right side view and a perspective view, respectively, of a guide sheath of a lancet according to an exemplary embodiment of the present invention;

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

FIGS. 6-1 to 6-3 are a front view, a sectional view H-H, and a perspective view, 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 a launch key of a lancet pen according to an exemplary embodiment of the present invention;

FIG. 8 is a front view of a needle withdrawing key of a lancet according to an exemplary embodiment of the present invention;

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

FIGS. 10-1 to 10-4 are a sectional view, a front view, a top view and a perspective view, respectively, of a tail 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 block engagement portion of a lancet according to an exemplary embodiment of the present invention;

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

FIGS. 13-1 to 13-3 are a front view, a sectional view A-A and a perspective view, 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 lancet with a pre-loaded drive spring according to an exemplary embodiment of the present invention;

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

FIG. 16 is a sectional view illustrating an excited state when the driving spring of the lancet is minimized in elasticity and penetration depth according to an exemplary embodiment of the present invention; and

fig. 17 illustrates the mating of the tail cap inner core with the outer shell.

Detailed Description

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

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

FIGS. 1-1 to 1-4 schematically show a tip cap 10 of a lancet, FIGS. 2-1 to 2-2 schematically show a cap core 20 of a lancet, FIGS. 4-1 to 4-5 schematically show a guide sleeve 40 of a lancet, FIGS. 5-1 to 5-6 schematically show an outer shell 50 of a lancet, FIGS. 6-1 to 6-3 schematically show a hub 60 of a lancet, FIGS. 9-1 to 9-3 schematically show a driving core or core 90 of a lancet, FIGS. 10-1 to 10-4 schematically show a tail cap core 110 of a lancet, FIGS. 11-1 to 11-3 schematically show a stopper-or stop-fitting 130 of a lancet, FIGS. 12-1 to 12-2 schematically show a stopper-or stop 140 of a lancet, FIGS. 13-1 to 13-3 schematically show a tail cap 160 of a lancet, FIG. 14 is a cross-sectional view illustrating the pre-loaded state of the drive spring of the lancet; FIG. 15 is a sectional view exemplarily showing an excited state when the elastic force and the penetration depth of the driving spring of the lancet are maximized; fig. 16 is a sectional view exemplarily showing an excited state when the elastic force and the penetration depth of the driving spring of the lancet are minimized.

As shown in the drawings, the hub 60 includes a hub groove 61 for holding the lancet 170 (see fig. 14); the first guide rib 62 can be inserted into the first guide groove 41 (see fig. 4-3) until the second positioning surface 64 contacts the third positioning surface 42 (see fig. 4-3).

As shown in fig. 2-2, the cap core 20 is a hollow shell, one end of the cap core is provided with a needle outlet two 24, the interior of the cap core is provided with an annular rib one 21, the annular rib one 21 is axially divided into a plurality of independent small pieces, the inner side end of each small piece is provided with a bulge or a salient point 25, the inner diameter enclosed by the salient points 25 is slightly smaller than the outer diameter of the needle seat groove 61, the needle seat groove 61 is in contact with the salient points 25 in the excitation process, the needle seat 60 can be allowed to pass through without circumferential shake or with circumferential shake due to the elasticity of a plastic material, as can be understood by those skilled in the art, the salient points 25 are arranged here, and the annular rib is divided into a plurality of. The spring 30 (see fig. 3 and 14) is arranged in the pen 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 pen cap inner core 20, the second end face 22 of the pen cap inner core 20 arranged in the spring 30 is pressed into the pen cap inner core 20 opposite to the third positioning face 42 of the guide sleeve 40 until the second end face 22 abuts against the third positioning face 42, the positioning rib 23 is in interference fit with the first positioning groove 43 at the moment, and the pen cap inner core 20 is fixedly connected with the guide sleeve 40 arranged in the needle base 60.

The head cap 10 comprises a needle outlet I11 for allowing the blood taking needle to be assembled and disassembled and to pass when taking blood; 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, an arrow mark on the head cap 10 corresponds to a triangular mark of the main body 50, which indicates that the head cap can be assembled and disassembled at the position; then the head cap 10 is rotated clockwise, the hanging table 12 firstly strides into the second positioning groove 46, 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 needle outlet direction to realize the needle withdrawing function, and the head cap 10 is in the needle withdrawing position; and continuing to rotate the head cap 10 clockwise, the hanging table 12 strides into the third positioning groove 47, at the moment, the stop block 13 is opposite to the axial position of the needle withdrawing key 80, the needle withdrawing key 80 is locked, and the head cap is in the locking position. It should be noted that the notch 45, the second positioning groove 46 and the third positioning groove 47 are separated by a longitudinal rib, so that the three are relatively independent, and the hanging table 12 can be switched between the positions thereof by manual operation.

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

The assembly of the pen cap and the guide cylinder is assembled with the shell 50 with the keys 70 placed, the assembling grooves 48 face the assembling ribs 52, one side of the positioning surface six 49 is the same as the emitting keys, and the guide sleeve is sleeved in the shell until the positioning surface five 44 abuts against the front end surface 53. A first separating sheet 56 is arranged in the main body 50, a special-shaped through hole 57 is formed in the first separating sheet 56 and used for the inner core 90 to longitudinally pass through, the part of the special-shaped through hole 57 matched with the tail part 92 is set to be smaller than the large-diameter part 92A on the tail part 92, and the inner core 90 is prevented from continuously moving forwards in the process of moving towards the needle outlet 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 and face the needle outlet direction to form two second guide grooves 58, as shown in figures 5-3, and the axial size of the two longitudinal ribs is enough to ensure that the inner core 90 does reciprocating motion in the excitation process.

The front end of the plunger 90 is provided with a first driving surface 97 which is in a contact state with the stress surface 65 in a free state so as to drive the needle seat 60 to move simultaneously when being excited until the plunger is forced to stop.

Then, the second spring 120 is sleeved on the tail portion 92, and the tail cap inner core 110 is rotatably connected with the main body 50 through the threaded connection of the threaded rib 113 and the threaded groove 59, the tail portion 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 inner core of the tail cap rotates away from the direction of 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 located 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 reduced axially. When the needle is rotated to meet the third blocking surface 117 and the fourth blocking surface 512, as shown in fig. 17, the tail cap inner core cannot rotate continuously in the direction away from the needle outlet. Guide groove five 114 in one embodiment, guide groove five 114 comprises two parts, and the portion is close to the shell is the straight groove that the both sides are parallel, plays direction and transmission with guide rib five 162 cooperation, and the portion is the loudspeaker shape far away from the shell, and during back-pulling the tail cap, the tail cap breaks away from guide rib five 162 to the change that leads to puncture dynamics and degree of depth is rotated to the accident. The first flap 130 is provided with a through hole 136 for the inner core 90 to pass through. As can be appreciated by those skilled in the art, in the case of integral rotation between the second flap 140 and the first flap 130 in the circumferential direction, in the case of rotation of the first flap 130 with the tail cap 160, the second flap 140 is also rotated, at which point the second flap 140 can rotate relative to the trailing end of the drive core 90, thereby not rotating the drive core 90.

Before the first baffle 130 is installed, the tail cap inner core 110 is rotated to the farthest end, the opening 134 (the opening 134 is convenient for the second baffle 140 to be sleeved on the tail portion 92) and the needle outlet are reversely sleeved on the tail portion 92, and then the spring three 150 is sleeved on the tail portion 92; then, the supporting ribs 141 correspond to the second through holes 131, the third guide grooves 142 face the third guide ribs 132, the second baffle pieces 140 are sleeved on the tail portion 92 until the second baffle pieces 140 are axially fixed by the clamping grooves 94, and when the tail cap is rotated, the third guide ribs 132 drive the second baffle pieces 140 to rotate simultaneously so as to ensure that the supporting ribs 141 correspond to the second through holes 131 all the time; the spring three 150 is limited between the first blocking piece 130 and the second blocking piece 140, and because the third blocking piece 140 is fixed relative to the inner core 90, the first blocking piece 130 is always kept at the position closest to the second blocking face 116 under the action of the elastic force of the spring three 150.

One end of the tail cap 160 is provided with an open hollow shell, the inside of the tail cap is provided with a second annular rib 163, and the distance from the axial end surface 165 (namely the second plane) to the third end surface 164 is equal to the moving distance of the tail cap inner core 110 when rotating to the farthest end away from the needle outlet; mounting flap one 130 to tail cap 160 with guide rib four 161 facing guide groove four 133 until plane one 135 and plane two 165 simultaneously contact stop plane two 116 (tail cap inner core 110 has been rotated to the most distal end); the inner diameter of the second annular rib 163 is smaller than the outer diameter of the first baffle 130, and the first baffle 130 and the second annular rib are sleeved together in an interference fit manner, so that the tail cap 160 and the first baffle 130 are always synchronous, namely the relative position of the tail cap 160 and the outer shell 50 cannot be influenced by the axial movement of the tail cap inner core 110.

The main push surface 81 of the needle withdrawing key 80 is in the same direction as the needle outlet, the cross rib where the main push surface 81 is located is pressed into the cross groove 510, the hanging platform 82 passes over the boss 410 in the process of resetting after the needle withdrawing of the needle withdrawing key 80, and the needle withdrawing key is prompted to reset through the change of hand feeling.

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

When blood is to be sampled, the tail cap 160 is firstly rotated, the tail cap inner core 110 is driven to rotate along the thread groove 59 through the matching of the guide rib four 161 and the guide groove five 114, the tail cap 160 is stopped at a proper position, and the numbers representing different blood sampling 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; the tail cap 160 is then pulled in a direction away from the needle outlet, causing the plunger 90 to move rearwardly so that the top surface 95 abuts against the positioning surface six 49 and the firing spring two 120 is compressed, as shown in fig. 14.

When the launching key 70 is pressed, the contact 73 pushes the triggering surface 96 to enable the top surface 95 to be separated from the positioning surface VI 49, the second launching spring 120 pushes the inner core 90 to move towards the needle outlet, the inner core 90 drives the second blocking piece 140 to move simultaneously, the support rib 141 stops after penetrating through the second through hole 131 and colliding with the second blocking piece 116, when the tail cap inner core moves towards the direction far away from the needle outlet, the support rib 141 collides with the second blocking piece 116 earlier, the distance for the inner core 90 to push the needle seat 60 to move is reduced, the pricking distance and the pricking force of the blood sampling needle are reduced, otherwise, the pricking force of the blood sampling needle is increased at the same time, and in the process, the distance between the second blocking piece 116 of the tail cap inner core and the end surface 135 of the first blocking piece 130 is gradually reduced from L (see fig..

After blood collection is finished, the needle base reset spring 30 pushes the needle base to reset, the pen cap is rotated to the needle withdrawing position 15, the needle withdrawing key 80 is pushed to withdraw the blood collection needle for discarding, the pen cap is rotated to the cap withdrawing position 16, the pen cap is taken down for disinfection and cleaning, and then the pen cap is installed and turned to the locking position 14.

Because the distance of the blood sampling needle is not controlled by the pen cap, after the pen cap is taken down, only the inner core of the pen cap can be used for sampling blood. Optionally, the pen cap can be designed to be non-detachable, and the 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 fifth guiding rib 162 drives the thread rib 113 of the inner core 110 of the tail cap to rotate along the thread groove 59, when the third blocking surface 117 is in close contact with the fourth blocking surface 512, the inner core 110 of the tail cap is at the farthest 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 exposure distance of the needle tip is minimum; when the tail cap inner core 110 is rotated to the point that the hook 118 blocks the surface five 513 to contact, the tail cap inner core 110 is positioned at the farthest end, the second spring 120 is limited by the control surface 93 and the blocking surface one 115, the compression amount of the driving spring is the largest, the elastic force is the largest, and the needle point exposure distance is the largest.

The needle-out speed can be adjusted by adjusting the elastic force of the second spring 120. Generally, the faster the needle is withdrawn, the less painful the user will feel, without consideration 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 stably moves through the deformation of the annular rib I21, so that the vibration 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 body 20 and the shell of the head cap core body 20 can accommodate part of the spring 30, and the circumferential shaking amount of the spring 30 is limited, so that the shaking of the blood taking needle in the blood taking process can be reduced, and the pain of a user is reduced.

In the embodiment of the invention, the adjustment of the piercing 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 core body of the head cap is driven to rotate by the rotation of the head cap, the number of parts for realizing the adjustment of the piercing depth is reduced.

In the embodiment of the invention, the lancing depth and the driving elasticity are adjusted and arranged on the blood sampling pen at the same time, so that the pain of a user is further reduced. The embodiment of the invention provides a blood sampling pen which simultaneously considers the puncture depth and the puncture force (speed) of a blood sampling needle.

In the embodiment of the present invention, although the hub and the driving core are two separate parts, they may be combined into one part, which is also within the scope of the present invention.

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

the tail cap core body can be arranged without the tail cap shell, or the tail cap core body and the tail cap shell are of an integrated structure;

the part connected with the second end of the driving spring (in the invention, the end far away from the needle outlet is the second end, and the end close to the needle outlet is the first end) can be arranged to move 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 in a compression state and also can provide driving force in a stretching state;

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

the lancet may not include a tip cap, or the tip cap is directly integrated with the housing of the lancet, without having to adjust the lancing depth with the tip cap;

under the condition that the tail cap is not needed to be used for positioning the blood sampling pen at a standby position to be triggered, the blood sampling pen is not provided with the tail cap, or the tail cap is directly integrated with the shell of the blood sampling pen;

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

The embodiment of the present invention further provides a blood sampling pen, including:

a housing 50;

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

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

a needle seat 60 arranged in the housing, the needle seat being adapted to mount a blood collection needle;

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

a drive core 90, which is adapted to drive the needle hub,

wherein:

the inner wall of the head cap is provided with a hanging table 12, and the outer wall of the head cap 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, a circumferential first positioning groove 46 and a circumferential second positioning groove 47 which are sequentially connected with the notch in the circumferential direction, and the notch, the circumferential first positioning groove and the circumferential second positioning groove are separated by longitudinal spacing ribs;

the headgear is in a position removable from the housing when the hangar is located within the cutout; 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 to 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 the locking position.

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

1. a lancet, comprising:

a housing;

a drive core adapted to drive the needle hub;

wherein:

2. The lancet of claim 1, wherein:

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

the first end of the tail cap core is in threaded connection with the second end of the outer shell and is adapted to adjust the axial position of the first blocking surface relative to the outer shell based on a threaded fit.

3. The lancet 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 extending part is suitable for penetrating through the third through hole and abutting against the second blocking surface.

4. The lancet of claim 3, wherein:

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

5. The lancet of claim 4, wherein:

an axial matching guide part is arranged between the blocking part and the blocking matching part; and is

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

6. The lancet of claim 4, wherein:

the main part of the blocking part is in a cylinder shape, and the extension part extends from the main part of the blocking part towards the blocking matching part.

7. The lancet of claim 4, wherein:

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

8. The lancet of claim 7, wherein:

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

9. The lancet of claim 8, wherein:

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

10. The lancet of claim 1, wherein:

the tail cap is provided with an inner cylinder body which is arranged at a distance from 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 lancet of claim 10, wherein:

and 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 as to drive the tail cap core body to rotate when the tail cap rotates.

12. The lancet 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 protrusion, and the longitudinal protrusion is matched with the longitudinal guide groove.

13. The lancet of claim 12, wherein:

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

14. The lancet 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 body are both located inside the tail cap core body and are spaced from the end face of the tail cap core body in the axial direction.

15. The lancet 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 according to any one of claims 1 to 15, comprising:

the second end of the guide cylinder is connected to the shell in a matching way;

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

17. The lancet of claim 16, wherein:

the inner wall of the head cap is provided with a hanging table, and the outer wall of the head cap 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, a circumferential first positioning groove and a circumferential second positioning groove which are sequentially connected with the notch in the circumferential direction, and the notch, the circumferential first positioning groove and the circumferential second positioning groove are separated by longitudinal spacing ribs;

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

18. The lancet of claim 16, wherein:

the head cap also comprises a head cap core body arranged in the head cap, and the second end of the head cap core body is sleeved to 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 aligned with the needle outlet, and an annular rib arranged around a needle outlet of the head cap core body, the annular rib is composed of a plurality of pieces which are spaced from each other 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 limited by the bulge is smaller than the outer diameter of the needle seat groove, and the needle seat groove is suitable for being placed in the containing space limited by the annular rib.

19. The lancet of claim 18, wherein:

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

a buckle connecting 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.

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 lancet, comprising:

a housing (50);

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

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

the blood sampling pen comprises a tail cap core body (110), wherein a baffle (111) 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 (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 a driving core body to pass through;

a tail cap (160) having a second end disposed within the tail cap core, the tail cap being axially movable relative to the tail cap core;

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

a return spring (150) adapted to return the drive core towards the rear end of the lancet,

wherein:

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

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

2. The lancet of claim 1, wherein:

the drive core has a spring interface (93), the drive spring being disposed between the spring interface and the first blocking surface;

3. The lancet of claim 2, comprising:

a blocking fitting (130) having a second through hole (136) through which the tail of the driving core passing through the first through hole is adapted to pass, and a third through hole (131);

the reset spring is sleeved on the driving core body and is arranged between the blocking matching part and the blocking part, and the extending part is suitable for penetrating through the third through hole and abutting against the second blocking surface (116).

4. The lancet of claim 3, wherein:

5. The lancet of claim 4, wherein:

an axial matching guide part (132 and 142) is arranged between the blocking part and the blocking matching part; and is

6. The lancet of claim 4, wherein:

7. The lancet of claim 4, wherein:

8. The lancet of claim 7, wherein:

the tail cap is provided with an inner cylinder (163) spaced apart from the side wall of the tail cap, and the inner wall of the inner cylinder is connected with the outer wall of the cylinder structure of the blocking matching part in an interference fit manner.

9. The lancet of claim 8, wherein:

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

10. The lancet of claim 1, wherein:

the tail cap is provided with an inner cylinder (163) arranged at a distance from the side wall of the tail cap;

11. The lancet of claim 10, wherein:

12. The lancet 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 lancet of claim 12, wherein:

14. The lancet 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 from the end face (164) of the tail cap core in the axial direction.

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

a guide cylinder (40), the second end of the guide cylinder is connected to the shell in a matching way;

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

17. The lancet of claim 16, wherein:

the inner wall of the head cap 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, a circumferential first positioning groove (46) and a circumferential second positioning groove (47) which are sequentially connected with the notch in the circumferential direction, and the notch, the circumferential first positioning groove and the circumferential second positioning groove are separated by longitudinal spacing ribs;

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

18. The lancet of claim 16, wherein:

the head cap also comprises a head cap core body (20) arranged in the head cap, and the second end of the head cap core body is sleeved to 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 (24) aligned with the needle outlet hole, and an annular rib (21) arranged around the needle outlet of the head cap core body, the annular rib is composed of a plurality of pieces which are spaced from each other in the circumferential direction, and the inner side of each piece is provided with a bulge (25);

the needle seat is provided with a needle seat groove (61), 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 in the containing space defined by the annular rib.

19. The lancet of claim 18, wherein:

a buckle connecting structure (23,43) 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.