CN111419241A

CN111419241A - Blood sampling pen capable of preventing needle from being detached due to misoperation after loading

Info

Publication number: CN111419241A
Application number: CN202010315939.2A
Authority: CN
Inventors: 施国平; 王祥生; 张金权
Original assignee: Sterilance Medical Suzhou Inc
Current assignee: Sterilance Medical Suzhou Inc
Priority date: 2020-04-21
Filing date: 2020-04-21
Publication date: 2020-07-17
Anticipated expiration: 2040-04-21
Also published as: CN111419241B

Abstract

The utility model provides a prevent that maloperation from unloading blood sampling pen of needle after loading, includes the casing, penetrates the pole and unloads the needle bar, its characterized in that: an elastic arm specially used for needle unloading protection is designed on the needle unloading rod, a main touch part is arranged on the arm of the elastic arm, and the arm end of the elastic arm is used as a lock tongue. Meanwhile, the shooting rod is provided with an auxiliary touch part aiming at the main touch part, and the shell is provided with a locking notch aiming at the lock tongue. When the shooting rod moves backwards relative to the shell and is loaded, the main touch part is in contact with the auxiliary touch part and forces the elastic arm to bend and deform, so that the lock tongue is driven to extend into the lock opening to occupy space, and the shooting rod automatically enters a needle-unloading protection state after being loaded. The design scheme solves the problem of needle unloading protection of the blood sampling pen without opening a pen cap to load and unload a needle, and the problem of inaccurate puncture depth caused by mistakenly touching the needle unloading part of the blood sampling pen of the rear-mounted puncture depth adjusting mechanism.

Description

Blood sampling pen capable of preventing needle from being detached due to misoperation after loading

Technical Field

The invention relates to a medical blood taking instrument, in particular to a blood taking pen matched with a disposable blood taking needle. This blood sampling pen is shooting pole loading back automatic entering and is unloaded needle protection state, and the effectual condition that has prevented that the maloperation from unloading the needle and the mistake from touching and unloading the needle position and leading to the blood sampling puncture degree of depth inaccurate takes place.

Background

The blood taking pen is a blood taking device matched with a disposable blood taking needle for use, wherein the blood taking pen can be repeatedly used, and the blood taking needle is only used once to avoid cross infection. The development of the blood sampling pen has been in history for decades, wherein the improvement of the blood sampling pen is also in many stages, the blood sampling pen is gradually mature at present, but in the development process of the blood sampling pen, how to effectively prevent the misoperation of needle removal after the blood sampling pen is loaded is always a problem concerned by technicians in the field.

Chinese patent CN107625526A discloses an invention patent application with application number 201710992736.5, entitled "blood sampling pen for preventing misoperation and needle removal" on 26.1.2018. Chinese patent CN108514422A discloses an invention patent application with application number 201810492946.2, namely blood sampling pen with needle unloading protection in 2018, 9, 11. Both of the above two patent applications provide positive and effective protection schemes and technical measures for preventing needle removal due to misoperation. The technical conception is that the needle is removed and protected by connecting or separating the pen cap and the cap base on the blood sampling pen. Namely, the needle-removing mechanism can not remove the needle when the pen cap is connected with the cap base, and the needle-removing mechanism can allow the needle to be removed when the pen cap is separated from the cap base. The two technical schemes are very effective for the blood sampling pen which can only be detached by opening the pen cap, but the blood sampling pen which can be detached without opening the pen cap (the pen cap is provided with the large hole through which the blood sampling needle can directly penetrate) appears along with the continuous development of the blood sampling pen technology at present, and the blood sampling pen is gradually a new popular development trend due to the simpler and more convenient operation. Obviously, the two technical schemes do not work for the blood sampling pen.

On the other hand, in order to meet the blood sampling requirements of different ages and different skin types of diabetes patients, the conventional blood sampling pen is usually provided with a puncture depth adjusting mechanism. On a blood sampling pen, the existing puncture depth adjusting mechanism generally has a front-mounted type and a rear-mounted type. Among them, the rear-mounted puncturing depth adjusting mechanism is the main development trend in the present and future. In the rear-mounted puncture depth adjusting mechanism, the insertion position precision of the blood taking needle and the needle seat in the axial direction of the blood taking pen has higher requirements because the puncture depth during blood taking is directly influenced. If the needle-removing part is touched by mistake in use, the puncture depth is changed, and the needle-removing part is not operated by mistake and is unacceptable.

Therefore, the technical problem to be solved in the art is how to design a new needle-removing mechanism for preventing misoperation so as to meet the requirement of a blood sampling pen for removing a blood sampling needle without opening a pen cap on needle-removing protection.

Disclosure of Invention

The invention provides a blood sampling pen capable of preventing needle detachment due to misoperation after loading, and aims to solve the problems of needle detachment protection of the blood sampling pen capable of mounting and detaching a needle without opening a pen cap and inaccurate puncture depth caused by mistakenly touching the needle detaching part of the blood sampling pen with a rear-mounted puncture depth adjusting mechanism.

In order to achieve the purpose, the invention adopts the technical scheme that: a blood sampling pen capable of preventing needle unloading due to misoperation after loading comprises a shell, a shooting rod and a needle unloading rod.

The shell is a pen shell structure of the blood sampling pen, and an ejection cavity is arranged in the shell.

The ejection rod is an ejection part capable of mounting a blood taking needle and is positioned in the ejection cavity, a needle seat for inserting the blood taking needle is arranged at the head of the ejection rod, and an upper chamber locking and unlocking structure is arranged between the ejection rod and the shell.

The needle unloading rod is a needle unloading part of the blood sampling pen, a needle unloading action surface is arranged on the needle unloading rod and used for pushing and unloading the blood sampling needle arranged on the needle seat.

The innovation lies in that: the needle unloading rod is provided with an elastic arm which is provided with a main touch part and a lock tongue.

The shooting rod is provided with an auxiliary touch part corresponding to the main touch part, one of the main touch part and the auxiliary touch part is provided with an inclined surface or an arc surface, and the other one is provided with a contact point or a contact surface matched with the inclined surface or the arc surface.

The shell is provided with a locking notch corresponding to the lock tongue, one of the lock tongue and the locking notch is provided with a first blocking surface, and the other is provided with a second blocking surface matched with the first blocking surface.

When the shooting rod is in a non-loading state relative to the shell, the main touch part on the needle unloading rod is positioned on a motion track of the auxiliary touch part along with loading of the shooting rod, and the main touch part and the auxiliary touch part are separated by a certain distance in the axial direction of the blood sampling pen; when the shooting rod moves backwards relative to the shell and is in a loading state, the auxiliary touch part on the shooting rod is in contact with the main touch part on the needle unloading rod and forces the elastic arm to bend and deform, so that the lock tongue on the elastic arm is driven to extend into the lock opening on the shell to occupy the space, the needle unloading rod is prevented from moving forwards relative to the shooting rod in a mode that the first blocking surface is opposite to the second blocking surface, and the shooting rod automatically enters a needle unloading protection state after being loaded.

The invention is explained below:

1. in the present invention, the meaning of "forward" in the terms of "forward", "front end", "front part" and "forward" means a direction in which a tip of a lancet is pointed or a shooting direction of the lancet. The meaning of "back" in "back", "rear end", "rear" and "rear" means a direction pointed by the pen tail of the lancet pen or a direction opposite to the direction in which the lancet is shot.

2. In the present invention, the "axial direction" refers to the axial direction of the lancet, and also to the radial direction of the line connecting the tip and the tail of the lancet, or to the front-back direction. The circumferential direction refers to the circumferential direction of the blood sampling pen.

3. In the present invention, the terms "outer edge", "exposed" and "outer side" mean "inner" and "outer". "outer edge" is opposite "inner edge", "outer edge" is opposite "inner side", and "exposed" means exposed on the outer side.

4. In the above scheme, the needle unloading rod is provided with a push rod for pushing and unloading the blood taking needle, the push rod and the elastic arm share the same rod body structure, and the needle unloading action surface is arranged on the end surface of the arm end of the elastic arm facing the needle seat. The needle unloading rod is provided with a manual action part for pushing and unloading the blood taking needle, and the manual action part is connected with the push rod on one hand and exposed out of the side part or the tail part of the blood taking pen on the other hand to form a side needle unloading structure or a tail needle unloading structure.

5. In the above scheme, the needle-removing rod is provided with a push rod for pushing and removing the blood taking needle, and the elastic arm is a branch structure on the push rod. The needle unloading rod is provided with a manual action part for pushing and unloading the blood taking needle, and the manual action part is connected with the push rod on one hand and exposed out of the side part or the tail part of the blood taking pen on the other hand to form a side needle unloading structure or a tail needle unloading structure.

The design principle and the technical concept of the invention are as follows: in order to solve the problem of needle-unloading protection of a blood sampling pen capable of loading and unloading a needle without opening a pen cap and the problem of inaccurate puncture depth of the blood sampling pen of a rear-mounted puncture depth adjusting mechanism due to mistaken contact with a needle-unloading part, the invention designs an elastic arm specially used for needle-unloading protection on a needle-unloading rod, a main touch part is arranged on the arm of the elastic arm and used for driving the elastic arm to bend and deform when being touched, and the arm end of the elastic arm is used as a lock tongue. Then, an auxiliary touch part is arranged on the shooting rod aiming at the main touch part, and a locking notch is arranged on the shell aiming at the lock tongue. When the shooting rod moves backwards relative to the shell and is loaded, the main touch part is in contact with the auxiliary touch part and forces the elastic arm to bend and deform, so that the lock tongue is driven to extend into the lock opening to occupy space, and the shooting rod automatically enters a needle-unloading protection state after being loaded.

Due to the application of the scheme, compared with the prior art, the invention has the following advantages and effects:

1. the invention can prevent the phenomenon that a user is hurt by mistakenly detaching the needle before the blood sampling pen is used, and can avoid the phenomenon that the blood sampling needle falls out and is wasted due to mistakenly detaching the needle.

2. The invention can avoid the phenomenon that the puncture depth is changed due to the mistaken contact of the needle part during the use of the blood sampling pen. Particularly, for the blood sampling pen of the rear-mounted puncture depth adjusting mechanism, the accuracy of the inserting position of the blood taking needle and the needle seat in the axial direction of the blood sampling pen has higher requirements, and the puncture depth of the blood taking needle in the position of the needle seat can directly influence the blood sampling is changed.

3. From the viewpoint of the use process of the blood sampling pen, needle installation and launching are usually completed instantly. However, the lancet is not always fired immediately after loading, and a long waiting period may elapse. How to prevent the needle part from being touched and detached by mistake after the injection rod is loaded in the waiting time is important to ensure the accuracy of the puncture depth and the safety brought by the fact that the blood taking needle is separated from the needle seat in advance. The technical scheme of the invention can well meet the requirements, so that the blood sampling pen automatically enters the needle unloading protection state after the shooting rod is loaded, and the blood sampling pen is very important from the viewpoints of use operability and use safety.

4. The needle-removing protection mechanism of the invention is not influenced by the working state of connection or separation of the pen cap and the cap seat on the blood sampling pen. The blood taking pen can be suitable for various types of blood taking pens, but is particularly suitable for the blood taking pens which are popular at present and can be used for assembling and disassembling the blood taking needle without opening the pen cap (the pen cap is provided with a large hole through which the blood taking needle can directly pass).

5. The invention utilizes the relative position and motion relation of the shooting rod, the needle unloading rod and the shell, and realizes the function of automatically entering the needle unloading protection state after the shooting rod is loaded by the technical means of arranging the elastic arm with the main touch part and the lock tongue on the needle unloading rod, arranging the auxiliary touch part on the shooting rod and arranging the lock notch on the shell. The design scheme is novel and reasonable, the technical concept is unique and ingenious, and the method has prominent substantive characteristics and remarkable progress.

6. The invention has better process manufacturability and reliable work, further improves the operation safety of the blood sampling pen, and plays a positive promoting role in the improvement and development of the blood sampling pen.

Drawings

FIG. 1 is an exploded perspective view of a lancet pen of the present invention in accordance with an embodiment 1;

FIG. 2 is a perspective view of a needle detaching lever in the embodiment 1 of the blood collection pen of the present invention;

FIG. 3 is a perspective view of a first angle of view of a shooting rod of the lancet 1 according to an embodiment of the present invention;

FIG. 4 is an enlarged view taken at A in FIG. 3;

FIG. 5 is a perspective view of a shooting rod of the blood sampling pen in accordance with embodiment 1 of the present invention from a second perspective;

FIG. 6 is a perspective view of a sheath in the blood sampling pen of embodiment 1 of the present invention;

FIG. 7 is a perspective sectional view of a sheath in a lancet embodiment 1 according to the present invention;

FIG. 8 is an enlarged view of FIG. 7 at B;

FIG. 9 is an exploded perspective view of a tail handle in accordance with an embodiment 1 of the lancet;

FIG. 10 is a perspective view of a tail handle in accordance with embodiment 1 of the lancet device of the present invention;

FIG. 11 is a perspective view of a housing of a lancet pen according to embodiment 1 of the present invention;

FIG. 12 is a combined perspective sectional view of a hub and a needle-removing shaft in the embodiment 1 of the lancet according to the present invention;

FIG. 13 is an enlarged view at C of FIG. 12;

FIG. 14 is a three-dimensional cross-sectional view showing the positional relationship among the injection rod, the needle release rod and the middle sleeve in the initial state of the blood sampling pen in accordance with embodiment 1 of the present invention;

FIG. 15 is an enlarged view at D of FIG. 14;

FIG. 16 is a three-dimensional cross-sectional view showing the positional relationship among the injection rod, the needle discharging rod and the middle sleeve in the loaded state of the blood sampling pen in accordance with embodiment 1 of the present invention;

FIG. 17 is an enlarged view at E of FIG. 16;

FIG. 18 is a view showing an initial assembly state of a lancet according to embodiment 1 of the present invention;

FIG. 19 is a view showing a state in which a lancet is directly inserted from a cap blood collection port in the embodiment 1 of the lancet according to the present invention;

FIG. 20 is a view showing the lancet of embodiment 1 of the lancet pen of the present invention continuously inserted until it is loaded;

FIG. 21 is a state view of the lancet of embodiment 1 of the present invention with the lancet protective cap removed;

FIG. 22 is a view showing a state in which a button is pressed to eject blood in embodiment 1 of the lancet device according to the present invention;

FIG. 23 is a view showing the recovery of the natural state of the blood collection pen of embodiment 1 after the blood collection is launched;

FIG. 24 is a perspective view of the housing of the blood collection pen of embodiment 2 of the present invention;

FIG. 25 is a cross-sectional view of the housing of the lancet pen of embodiment 2 of the present invention;

FIG. 26 is a perspective view of a needle detaching lever in accordance with embodiment 2 of the lancet device of the present invention;

FIG. 27 is a rear perspective view of a shooting rod of a lancet pen according to embodiment 2 of the present invention;

FIG. 28 is a combined three-dimensional sectional view of a housing, a needle discharging rod and a shooting rod of a blood sampling pen in an upper chamber state in accordance with embodiment 2 of the present invention;

FIG. 29 is an enlarged view at F of FIG. 28;

FIG. 30 is a combined three-dimensional sectional view of a housing, a needle discharging rod and a shooting rod of a blood sampling pen in a non-loading state in embodiment 2 of the invention;

FIG. 31 is an enlarged view at G of FIG. 30;

FIG. 32 is a sectional view of the combination of the casing, the needle discharging rod and the shooting rod in a non-loaded state in the embodiment 2 of the blood sampling pen of the present invention;

FIG. 33 is a sectional view of a combination of a housing, a needle detaching lever and a shooting lever in a loaded state in accordance with embodiment 2 of the lancet of the present invention;

FIG. 34 is an enlarged view at H of FIG. 33;

FIG. 35 is a sectional view of the lancet of embodiment 2 of the present invention showing the combination of the housing, the needle detaching lever and the shooting lever in the launched state;

FIG. 36 is a sectional view showing a combination of a housing, a needle removing shaft and a plunger in a state where the needle removing shaft is pressed in embodiment 2 of the lancet according to the present invention.

In the above drawings: 1. a pen cap; 2. a middle sleeve; 3. a blood collection end face; 4. an axial limiting surface; 5. a blood collection needle; 6. shooting a rod; 7. an active impact surface; 8. a jacket; 9. an inner sleeve; 10. a tail handle; 11. rotating the positioning groove; 12. rotating the positioning block; 13. a passive impact surface; 14. a guide groove; 15. a guide projection; 16. a rear end face; 17. a housing; 18. a front end face; 19. a limiting action part; 20. rotating the limiting convex rib; 21. a corner limiting surface; 23. a button; 24. removing the needle action surface; 25. a resilient arm; 26. a main touch part; 27. unloading the needle rod; 28. a latch bolt; 29. a return spring; 30. a firing spring; 31. a needle seat; 32. a secondary touch part; 33. locking the opening; 34. a positioning hook; 35. and a positioning clamping groove.

Detailed Description

The invention is further described with reference to the following figures and examples:

example 1: prevent that maloperation from unloading blood sampling pen of needle after loading

As shown in fig. 1-18, the blood sampling pen is composed of a pen cap 1, a middle sleeve 2, a shooting rod 6, a needle removing rod 27, a shell 17, a button 23, a launching spring 30, a return spring 29, an inner sleeve 9 and an outer sleeve 8 (see fig. 1). The pen cap 1, the middle sleeve 2 and the shell 17 are connected to form a shell, and an ejection cavity is formed in the shell. The inner sleeve 9 and the outer sleeve 8 are both connected to form a tail handle 10 in the present invention (see fig. 9 and 10).

The pen cap 1 is a sleeve type cap of the head part of the blood sampling pen, and the front end of the pen cap 1 is provided with a blood sampling end face 3 (shown in figure 1) for contacting a blood sampling part of a human body. The middle sleeve 2 is a base body which is used for being connected and matched with the pen cap 1 at the front part of the blood sampling pen, the pen cap 1 is connected with the middle sleeve 2 in a matched mode through a connecting port, and the pen cap 1 and the middle sleeve 2 form plug connection through the plug port (see fig. 18). Penetrate pole 6 and be one can install the emission part of blood taking needle 5, penetrate pole 6 and be located ejection cavity, penetrate and be equipped with between pole 6 and the casing and go up the thorax and lock and unlock the structure. In the present embodiment, the head of the shoot rod 6 is provided with a needle holder 31 (see fig. 5) for mounting the lancet 5. The outer shell 17 is fixedly connected with the middle sleeve 2, but the outer shell 17 and the middle sleeve 2 can also be designed into an integrally formed structure. The launching spring 30 is a spring for providing puncture blood sampling power, and the launching spring 30 is positioned in the ejection cavity. The tail handle 10 is a handle arranged at the tail of the blood sampling pen and used for driving the shooting rod 6 to be loaded and adjusting the puncture depth, and the main body of the tail handle 10 is of a sleeve structure which is in sliding connection with the shell in the axial direction of the blood sampling pen. In the present embodiment, the sleeve structure of the main body of the tail handle 10 is formed by fixedly connecting both the inner sleeve 9 and the outer sleeve 8 (see fig. 9 and 10). The return spring 29 is a spring for providing the return power for the tail handle 10, and the return spring 29 is positioned in the ejection cavity and acts on the return direction of the tail handle 10. The needle discharging rod 27 is an ejector rod (see fig. 2) on the blood collecting pen for discharging the blood collecting needle 5. The needle unloading rod 27 is a needle unloading part of the blood sampling pen, the needle unloading rod 27 is provided with a needle unloading acting surface 24, and the needle unloading acting surface 24 is used for pushing and unloading the blood sampling needle 5 arranged on the needle seat 31.

The innovation of the invention is described as follows:

in order to solve the problem of needle-unloading protection of a blood sampling pen which can load and unload a needle without opening a pen cap and the problem of inaccurate puncture depth of the blood sampling pen of a rear-mounted puncture depth adjusting mechanism caused by mistakenly touching the needle-unloading part, the invention adopts the following technical measures.

The needle discharging rod 27 is provided with an elastic arm 25 (see fig. 2), and the elastic arm 25 is provided with a main touch part 26 and a lock tongue 28. A secondary trigger 32 (see fig. 3 and 4) is provided on the shooting rod 6 corresponding to the primary trigger 26, one of the primary trigger 26 and the secondary trigger 32 is provided with an inclined surface or an arc surface, and the other is provided with a contact point or a contact surface matched with the inclined surface or the arc surface. In this embodiment, the secondary actuation portion 32 is a convex arc surface (see fig. 18), and the primary actuation portion 26 is also a convex contact surface (see fig. 18). But both may also be beveled. As would be understood and accepted by those skilled in the art. A locking notch 33 (see fig. 7 and 8) is formed on the housing corresponding to the locking tongue 28, and one of the locking tongue 28 and the locking notch 33 is provided with a first blocking surface, and the other is provided with a second blocking surface matched with the first blocking surface.

In this embodiment, the needle-removing rod 27 has a pushing rod for removing the blood collection needle 5, and the pushing rod and the elastic arm 25 share the same rod structure, and the needle-removing action surface 24 is provided on the end surface of the arm end of the elastic arm 25 facing the needle holder 31 (see fig. 2). The needle-removing rod 27 has a manual operating portion for removing the lancet 5, which is connected to the pushing rod on one hand and exposed to the side of the lancet pen on the other hand, to form a side needle-removing structure (see fig. 18).

When the shooting rod 6 is in a non-loading state relative to the shell (see fig. 14 and 15), the main touch part 26 on the needle discharging rod 27 is positioned on the motion track of the auxiliary touch part 32 along with the loading of the shooting rod 6, and the main touch part 26 and the auxiliary touch part 32 are separated by a certain distance in the axial direction of the blood sampling pen. When the shooting rod 6 moves backwards relative to the shell and is in a loading state (see fig. 16 and 17), the auxiliary trigger part 32 on the shooting rod 6 is in contact with the main trigger part 26 on the needle discharging rod 27 and forces the elastic arm 25 to bend and deform, so that the lock tongue 28 on the elastic arm 25 is driven to extend into the lock notch 33 on the shell to occupy space, and the needle discharging rod 27 is prevented from moving forwards relative to the shooting rod 6 in a mode that the first blocking surface is opposite to the second blocking surface, so that the shooting rod 6 automatically enters a needle discharging protection state after loading.

The blood taking pen of the embodiment adopts a rear-mounted puncture depth adjusting mechanism, so that the blood taking needle 5 and the needle seat 31 have higher positioning precision requirements. In order to meet the requirement, a positioning hook 34 (see fig. 18) is arranged on the side wall of the needle seat 31, a positioning clamping groove 35 (see fig. 19) is arranged on the side wall of the blood taking needle 5 corresponding to the positioning hook 34, the positioning hook 34 is matched with the positioning clamping groove 35 to fix the blood taking needle 5 on the needle seat 31 in a needle loading state, and the needle tip of the blood taking needle 5 is positioned in the axial direction of the blood taking needle relative to the injection rod 6 so as to keep the consistency of the puncture depth during blood taking.

In order to make the tail handle 10 can be used as a component for adjusting the puncture depth and a component for pulling the shooting rod 6 to be loaded. The outer edge of the tail handle 10 is matched with the inner edge of the outer shell 17 to form a composite matching section, and in the composite matching section, one of the outer edge of the tail handle 10 and the inner edge of the outer shell 17 is provided with a guide groove 14, and the other is provided with a guide lug 15. In the present embodiment, the guide groove 14 is provided on the inner edge of the housing 17 (see fig. 11), and the guide projection 15 is provided on the outer edge of the tail tab 10 (see fig. 9 and 10). The length direction of the guide grooves 14 is parallel to the axial line of the lancet, and the guide grooves 14 are arranged at intervals in the circumferential direction of the lancet (see fig. 11).

On the composite matching section, the guide lug 15 and the guide groove 14 have two working states of non-matching and matching. In the non-matching working state, the guide projection 15 and the guide groove 14 are arranged in a staggered manner in the axial direction of the blood sampling pen, and the tail handle 10 is in rotating fit with the shell in the circumferential direction of the blood sampling pen. In the fitting state, the guide projection 15 and the guide groove 14 are arranged to overlap in the lancet axial direction, and the tail catch 10 is slidably fitted to the housing in the lancet axial direction. The invention utilizes the non-matching working state of the guide lug 15 and the guide groove 14 to meet the requirement that the tail handle 10 rotates circumferentially relative to the shell 17 when the puncture depth is adjusted, and utilizes the matching working state to meet the requirement that the tail handle 10 slides axially relative to the shell 17 when the shooting rod 6 is loaded, thereby being capable of using the same tail handle 10 to adjust the puncture depth and drive the shooting rod 6 to be loaded.

In the invention, the puncture depth adjusting structure adopts a rear-mounted adjusting structure (relative to the puncture depth preposing or head adjusting structure), namely the puncture depth adjusting structure is arranged at the rear part of the blood sampling pen. The tail handle 10 is used as a part for driving the shooting rod 6 to be loaded and also used as a part for adjusting the puncture depth. Therefore, starting from the requirement of rear-mounted puncture depth adjustment, the tail handle 10 should have a front end limit relative to the housing 17, otherwise the requirement of puncture depth adjustment accuracy cannot be met. In the present invention, in order to realize that the tail handle 10 should have a front end limit with respect to the housing 17, one of the tail handle 10 and the housing 17 is provided with an axial limit surface 4, and the other is provided with a limit action part 19, and the axial limit surface 4 and the limit action part 19 are in contact fit to limit the position of the tail handle 10 sliding forward in the axial direction with respect to the housing 17. In the present embodiment, the axial stopper surface 4 is provided on the housing 17 (see fig. 11), and the stopper-acting portion 19 is provided on the tail tab 10 (see fig. 9 and 10).

In the invention, the post-puncture depth adjusting structure consists of a shooting rod 6, a tail handle 10 and a return spring 29. Wherein, the rear part of the shooting rod 6 is provided with an active impact surface 7 (see figure 5), and the active impact surface 7 faces the front of the blood sampling pen. A passive impact surface 13 (see fig. 9) is arranged on the sleeve structure of the tail handle 10 corresponding to the active impact surface 7, and the passive impact surface 13 faces the rear of the blood sampling pen. In this embodiment, the passive striking surface 13 is a spiral step surface facing the rear of the lancet on the sleeve structure of the tail handle 10 (see fig. 9).

In order to install the return spring 29 between the shooting lever 6 and the tail handle 10, the rear portion of the shooting lever 6 is provided with a rear end surface 16 (see fig. 5) for abutting against the return spring 29, the rear end surface 16 facing toward the front of the lancet. The rear end face 16 is provided on the inner edge of the sleeve structure of the rear handle 10 with a front end face 18 (see fig. 9) for abutting against a return spring 29, which front end face 18 faces the rear of the lancet.

In order to provide the tail handle 10 with gear feeling during the puncturing depth adjustment, the tail handle 10 is provided with a rotary positioning structure relative to the housing 17 in the circumferential direction of the blood sampling pen, the rotary positioning structure is formed by matching a rotary positioning groove 11 and a rotary positioning block 12, one of the rotary positioning groove 11 and the rotary positioning block 12 is arranged on the tail handle 10, and the other is arranged on the housing 17 or a component which is fixedly connected with the housing 17. In this embodiment, the rotation positioning slot 11 is provided on the outer edge of the tail of the middle sleeve 2 (see fig. 6 and 7), and the rotation positioning block 12 is provided on the inner edge of the inner sleeve 9 (see fig. 9). The two are matched to form a rotary positioning structure, when the tail handle 10 is rotated, the tail handle rotates relative to the shell 17 in a circumferential intermittent mode, and meanwhile, the sound of clicking is generated. The middle sleeve 2 belongs to one part of the shell, and the middle sleeve 2 is fixedly connected with the shell 17. The length direction of the rotating positioning grooves 11 is parallel to the axial line of the blood sampling pen, and the rotating positioning grooves 11 are distributed at intervals in the circumferential direction of the blood sampling pen.

In the present embodiment, the sleeve structure of the main body of the tail handle 10 is composed of an outer sleeve 8 and an inner sleeve 9, the inner sleeve 9 is fixed at the inner side of the front end of the outer sleeve 8 in the assembled state, the guide projection 15 is arranged on the outer edge of the inner sleeve 9 or the outer sleeve 8, and the passive striking surface 13 is arranged on the end surface of the inner sleeve 9 facing to the rear of the lancet (see fig. 9 and 10).

In this embodiment, a rotation limiting rib 20 (see fig. 11) is provided on the inner edge of the housing 17, and a rotation limiting surface 21 (see fig. 11) facing the circumferential direction of the lancet is provided on the rotation limiting rib 20. When the guide lug 15 and the guide groove 14 are in a non-matching working state, the guide lug 15 and the corner limiting surface 21 are matched to limit the circumferential rotation amplitude of the tail handle 10 relative to the shell.

In the embodiment, the casing is composed of a pen cap 1, an outer shell 17 and a middle sleeve 2 (see fig. 18), the main body of the middle sleeve 2 is of a cylindrical structure (see fig. 6 and 7), the middle sleeve 2 is positioned in the outer shell 17 and fixedly connected with the outer shell 17, and the pen cap 1 is positioned at the front part of the outer shell 17 and detachably and fixedly connected with the outer shell 17 (see fig. 18). The ejection chamber is formed mainly by the tubular inner chamber of the middle sleeve 2, in which the ejection rod 6 is located in the assembled state (see fig. 18).

In order to better understand the relative positions and relationships among the components of the invention, the blood sampling pen of the invention is described in combination with the use state as follows:

1. initial assembled state

FIG. 18 is a view showing an initial assembly state of the lancet according to embodiment 1 of the present invention. FIG. 14 is a perspective sectional view showing the positional relationship among the injection rod 6, the needle detaching rod 27 and the middle cap 2 in the initial state of the lancet embodiment 1 of the present invention. In an initial assembly state, the front portion of the sleeve structure of the tail knob 10 is inserted into the rear portion of the housing 17, and the rear portion of the sleeve structure of the tail knob 10 is exposed outside the rear portion or the middle portion of the lancet pen for the user to manually operate. The rear part of the shooting rod 6 is inserted in the sleeve structure of the tail handle 10. One end of the launching spring 30 is positioned on the shooting rod 6, the other end of the launching spring 30 is positioned on the inner end surface of the middle sleeve 2, and the launching spring 30 acts in the launching direction of the shooting rod 6. The return spring 29 is sleeved at the rear part of the shooting rod 6, wherein one end of the return spring 29 abuts against the front end face 18 (not marked in fig. 18) of the tail handle 10, the other end abuts against the rear end face 16 (not marked in fig. 18) of the shooting rod 6, and under the action of the return spring 29, the axial limiting face 4 between the tail handle 10 and the shell 17 is in contact fit with the limiting action part 19, so that the tail handle 10 is located at a front end limiting position relative to the shell, namely, the tail handle 10 is located at an initial balance position.

When the tail handle 10 is in the initial balance position state, the guide projection 15 and the guide groove 14 between the tail handle 10 and the shell 17 are arranged in a staggered mode in the axial direction of the blood collecting pen and are in a non-matching working state. Under the non-matching working state of the guide convex block 15 and the guide groove 14, the exposed part at the rear part of the tail handle 10 is manually rotated to drive the passive impact surface 13 on the sleeve structure of the tail handle 10 to circumferentially rotate relative to the active impact surface 7 at the rear part of the shooting rod 6, the tail handle 10 is constrained by the rotation positioning structure in the circumferential rotation process, the tail handle 10 circumferentially intermittently rotates relative to the shell and stops at different positioning positions in the circumferential direction, and the passive impact surface 13 is a spiral step surface or a spiral surface or an inclined surface, so that the axial distance between the blood sampling end surface 3 and the passive impact surface 13 of the blood sampling pen is changed, and the puncture depth of the needle point is adjusted.

In the initial assembly state, the shooting rod 6 is in a non-loading state relative to the shell, the main touch part 26 on the needle discharging rod 27 is positioned on the motion track of the auxiliary touch part 32 along with loading of the shooting rod 6, and the main touch part 26 and the auxiliary touch part 32 are separated by a certain distance in the axial direction of the blood sampling pen (see fig. 14 and 15). The latch tongue 28 on the resilient arm 25 is positioned over the locking notch 33 on the middle sleeve 2. The needle discharging rod 27 is in a non-locking state, namely a non-needle discharging protection state.

2. State of directly inserting blood taking needle from pen cap blood taking port

FIG. 19 is a view showing a state in which a lancet is directly inserted from a cap blood collection port in the lancet according to embodiment 1 of the present invention. Because the needle outlet hole at the front end of the pen cap 1 is designed to be a big hole, the blood taking needle 5 is directly inserted into the needle base 31 through the big hole at the front end, the pen cap 1 does not need to be dismounted during needle installation, the blood taking needle 5 can be directly inserted from the blood taking port of the pen cap 1, and the tail end face of the blood taking needle 5 is propped against the needle dismounting action surface 24 at the front end of the needle dismounting rod 27.

3. Continuously inserting the blood taking needle until the blood taking needle is in the loading state

FIG. 20 is a view showing a state in which the lancet of the embodiment 1 of the lancet pen of the present invention is inserted until it is loaded. Fig. 16 and 17 are perspective sectional views showing the positional relationship among the injection rod 6, the needle detaching rod 27 and the middle cap 2 in the loaded state in the lancet embodiment 1 of the present invention. As can be seen from the figure, when the blood collection needle 5 is continuously inserted, the head of the blood collection needle 5 is gradually inserted into the bottom of the needle seat 31, and the needle discharging rod 27 is pushed to move backwards. In the process, the secondary triggering portion 32 of the firing rod 6 gradually approaches the primary triggering portion 26 of the elastic arm 25 of the needle discharging rod 27, and the latch tongue 28 of the elastic arm 25 gradually approaches the locking notch 33 of the middle sleeve 2 along with the bending of the elastic arm 25.

With the blood taking needle 5 being inserted into the needle seat 31 continuously, the shooting rod 6 moves backwards along with the blood taking needle 5 until the shooting rod 6 is locked in the loading chamber, the positioning clamping hook 34 is in clamping fit with the positioning clamping groove 35 to fix the blood taking needle 5 on the needle seat 31 (see fig. 20), and meanwhile, the needle tip of the blood taking needle 5 is positioned in the axial direction of the blood taking pen relative to the shooting rod 6 so as to keep the consistency of the puncture depth during blood taking.

In the loading locking state of the firing rod 6, the auxiliary triggering part 32 on the firing rod 6 contacts with the main triggering part 26 of the elastic arm 25 on the needle discharging rod 27 and forces the elastic arm 25 to bend and deform, so that the lock tongue 28 on the elastic arm 25 is driven to extend into the lock notch 33 on the middle sleeve 2 to occupy the space (see fig. 16 and 17), and the needle discharging rod 27 is prevented from moving forward relative to the firing rod 6 by the way that the first blocking surface and the second blocking surface are opposite, so that the firing rod 6 automatically enters the needle discharging protection state after loading.

After the loading of the shooting rod 6 of the blood sampling pen is finished, the tail handle 10 is still in the initial balance position, and if the blood sampling puncture depth needs to be adjusted in the state, the tail handle 10 can be rotated to operate.

4. State of removing protective cap

FIG. 21 is a view showing a state where the lancet protecting cap is removed in the embodiment 1 of the lancet according to the present invention. As can be seen in fig. 21, the schematic illustration of the twisting off of the protective cap on the lancet 5.

After the protective cap of the lancet 5 is twisted off, since the tail handle 10 is still in the initial equilibrium position, if the blood collection puncturing depth is to be adjusted in this state, the tail handle 10 can be rotated to operate.

5. Emission blood sampling state

FIG. 22 is a view showing a state in which a button is pressed to eject blood collection in the embodiment 1 of the lancet device according to the present invention. In this state, the button 23 is pressed to force the shooting rod 6 to unhook, the launching spring 30 pushes the shooting rod 6 and the blood taking needle 5 to move forward, the shooting rod 6 and the blood taking needle 5 compress the return spring 29 firstly in the forward movement launching process, then the active striking surface 7 at the rear part of the shooting rod 6 is in striking fit with the passive striking surface 13 (see fig. 22) on the sleeve structure of the tail handle 10 to stop the shooting rod 6 from launching forward, and the blood taking needle 5 launches the puncture.

6. Recovering to natural state

FIG. 23 is a view showing the recovery of the natural state of the blood collection pen of embodiment 1 of the present invention after the blood collection is launched. It can be seen from figure 23 that the shoot lever 6 returns to its initial position under the influence of the return spring 29.

After blood collection, if the blood collection amount is insufficient or no blood is collected due to insufficient puncture depth, the tail handle 10 is still in the initial balance position, and if the blood collection puncture depth needs to be adjusted in the state, the tail handle 10 can be rotated to realize the blood collection.

7. Initial loading state by tail handle

This state is not shown. On the basis of the former state, the exposed part at the rear part of the tail handle 10 is pulled backwards manually, the sleeve structure of the tail handle 10 overcomes the elastic force of the return spring 29 and moves backwards relative to the shell 17 in an axial direction, at the moment, the tail handle 10 leaves the initial balance position, the guide lug 15 and the guide groove 14 between the tail handle 10 and the shell 17 are changed from the original staggered arrangement (in a non-matched working state) in the axial direction of the blood sampling pen into the overlapped arrangement in the axial direction of the blood sampling pen and are in a matched working state, and at the moment, the tail handle 10 cannot rotate relative to the shell 17. In other words, during the backward axial movement of the tail handle 10, the guide groove 14 between the outer edge of the tail handle 10 and the inner edge of the housing 17 is slidably engaged with the guide projection 15 and plays a guiding role in the axial direction of the lancet, and the tail handle 10 is constrained by the sliding engagement of the guide groove 14 and the guide projection 15, so that the freedom of circumferential rotation of the tail handle 10 relative to the housing is lost, and the tail handle cannot rotate but axially slides.

8. Loading state of tail handle

This state is not shown. On the basis of the last state, the tail handle 10 is pulled continuously, after the elastic force of the launching spring 30 is overcome, the passive impact surface 13 is forced to be in contact with the active impact surface 7 at the rear part of the shooting rod 6, and the shooting rod 6 is driven to move backwards relative to the shell 17 until the shooting rod 6 is loaded and locked.

9. After the completion of loading the tail handle

This state is not shown. On the basis of the previous state, after the tail handle 10 is pulled backwards manually to drive the shooting rod 6 to be loaded and locked, the tail handle 10 is released, and under the action of the elastic force of the return spring 29, the tail handle 10 moves forwards axially relative to the shell 17 until the tail handle 10 is in the initial balance position again, and then the tail handle stops. At this time, the guide projection 15 and the guide groove 14 between the tail handle 10 and the housing 17 are overlapped in the axial direction of the lancet, and are restored to the staggered arrangement state in the axial direction of the lancet.

In this state, since the tail handle 10 is still in the initial equilibrium position, if it is desired to adjust the blood sampling piercing depth, it is possible to operate the tail handle 10 by rotating.

Therefore, the tail handle 10 is manually pulled backwards from the initial balance position of the tail handle 10, so that the guide lug 15 and the guide groove 14 between the tail handle 10 and the shell 17 can be switched between the non-fit working state and the fit working state.

10. Initial state of needle removal

This state is not shown. Needle removal for the purposes of the present invention is generally a standard operation after the blood collection pen has been fired to collect blood. At this point, the needle removal protection has been automatically released following completion of the firing operation. In this state, the needle discharging rod 27 is pushed forward, the needle discharging action surface 24 on the needle discharging rod 27 abuts against the end surface of the tail part of the blood collection needle 5 and moves forward, the blood collection needle 5 is clamped by the needle seat 31, the shooting rod 6 is driven to move forward, and the shooting rod 6 stops moving forward until the tail part active striking surface 7 of the shooting rod 6 contacts with the passive striking surface 13 on the tail handle 10. The needle discharging rod 27 is pushed continuously, the shooting rod 6 is fixed relatively, the positioning hook 34 is forced to be unhooked from the positioning clamping groove 35, and the blood taking needle 5 is ejected out of the needle seat 31 by the needle discharging rod 27.

11. Resume the initial state

This state is not shown. On the basis of the previous state, the needle discharging rod 27 is continuously pushed until the blood collection needle 5 is completely ejected. The blood collection needle 5 automatically falls off from the cap 1 under the influence of gravity, and the shooting rod 6 is restored to the initial position.

Example 2: prevent that maloperation from unloading blood sampling pen of needle after loading

As shown in fig. 24 to 36, embodiment 2 differs from embodiment 1 as follows:

1. the setting position of the locking notch 33 is different

FIG. 24 is a perspective view showing a casing of a lancet 2 according to the present invention, and FIG. 25 is a sectional view showing the casing of the lancet 2 according to the present invention. It can be seen that the locking notch 33 is provided on the inner rim of the housing 17. The housing according to the invention is defined by the cap 1, the middle cap 2 and the outer shell 17, so that the outer shell 17 also forms part of the housing, which is identical to the middle cap 2 in terms of its structural properties, except for the different parts of the housing.

2. The resilient arms 25 are arranged in different positions and forms

FIG. 26 is a perspective view showing a needle detaching lever in embodiment 2 of the blood collection pen of the present invention. As can be seen, the resilient arm 25 is in the form of a leaf spring, and the resilient arm 25 is a branched structure on a push rod, which is the round rod in fig. 26. In embodiment 1, the elastic arm 25 and the pushing rod share the same rod structure. However, in terms of structural attributes, the elastic arms 25 of the embodiments 1 and 2 are both provided on the needle discharging rod 27, and the main touching portion 26 and the latch 28 are both provided on the elastic arms 25.

3. The arrangement positions of the secondary touch parts 32 are different

FIG. 27 is a perspective view showing the rear end of the injection rod in embodiment 2 of the lancet device of the present invention. As can be seen, the secondary trigger 32 is provided on the rear of the shoot rod 6. And the sub trigger 32 of embodiment 1 is provided in the middle of the shooting rod 6.

Example 2 is briefly described below with reference to the accompanying drawings:

fig. 28 is a perspective sectional view showing a combination of the case 17, the needle detaching lever 27, and the shooting lever 6 in a state where the lancet embodiment 2 of the present invention is loaded, fig. 29 is an enlarged view of F in fig. 28, fig. 33 is a sectional view showing a combination of the case 17, the needle detaching lever 27, and the shooting lever 6 in a state where the lancet embodiment 2 of the present invention is loaded, and fig. 34 is an enlarged view of H in fig. 33. As can be seen from these figures, particularly fig. 29 and 34, in the loaded locked state of the shooting rod 6, the secondary trigger 32 on the shooting rod 6 contacts the primary trigger 26 on the needle discharging rod 27 and forces the elastic arm 25 to bend and deform, thereby driving the latch 28 on the elastic arm 25 to extend into the locking notch 33 on the casing to occupy space, preventing the needle discharging rod 27 from moving forward relative to the shooting rod 6, and automatically putting the shooting rod 6 into the needle discharging protection state after loading.

FIG. 30 is a perspective sectional view showing a combination of a housing 17, a needle detaching lever 27 and a shooting lever 6 in a non-loaded state in the lancet embodiment 2 of the present invention, FIG. 31 is an enlarged view of G in FIG. 30, and FIG. 32 is a sectional view showing a combination of the housing 17, the needle detaching lever 27 and the shooting lever 6 in the non-loaded state in the lancet embodiment 2 of the present invention. As can be seen from these figures, particularly fig. 30 and 32, when the shooting rod 6 is in a non-cocked state relative to the housing, the main trigger 26 on the needle discharging rod 27 is located on the movement track of the auxiliary trigger 32 along with cocking of the shooting rod 6, and the main trigger 26 and the auxiliary trigger 32 are spaced apart from each other in the axial direction of the lancet.

FIG. 35 is a sectional view showing a combination of the case 17, the needle detaching lever 27 and the shooting lever 6 in the shooting state in the lancet embodiment 2 of the present invention. It can be seen from the figure that in the firing state the firing rod 6 is shot forward (see arrow in the figure) under the action of the firing spring 30. FIG. 36 is a sectional view showing a combination of the case 17, the needle detaching lever 27 and the shooting lever 6 in a state where the needle detaching lever is pressed in the lancet embodiment 2 of the present invention. As can be seen from the figure, the embodiment 2 is a tail needle-unloading structure, and the needle can be unloaded by pressing the needle-unloading rod 27 (see an arrow in the figure).

The rest of embodiment 2 is the same as embodiment 1, and the description thereof will not be repeated.

With respect to the above embodiments, possible variations of the present invention are described below:

1. in the above embodiment 1, the needle-removing rod 27 has a manual operating portion for removing the blood collection needle 5, and the manual operating portion is connected to the pushing rod and exposed to the side of the blood collection pen to form a side needle-removing structure (see fig. 18). However, the present invention is not limited thereto, and the manual operation portion may be exposed to the tail portion of the blood sampling pen to form a tail portion needle-removing structure. As would be understood and accepted by those skilled in the art.

2. In the above embodiment 1, the needle discharging rod 27 has a pushing rod for discharging the blood collection needle 5, the pushing rod and the elastic arm 25 share the same rod structure, and the needle discharging action surface 24 is provided on the end surface of the arm end of the elastic arm 25 facing the needle holder 31 (see fig. 2). However, the present invention is not limited thereto, and the elastic arm 25 may be designed to have a branched structure on the push rod, and the same can be achieved. The manual action part is connected with the push rod on one hand and exposed out of the side part of the blood sampling pen on the other hand to form a side needle unloading structure which is exposed out of the tail part of the blood sampling pen to form a tail needle unloading structure. As would be understood and accepted by those skilled in the art.

3. In the above embodiment 1, the guide groove 14 is provided on the inner edge of the outer case 17 (see fig. 11), and the guide projection 15 is provided on the outer edge of the tail tab 10 (see fig. 9 and 10). However, the present invention is not limited thereto, and the guide groove 14 may be provided on the outer edge of the tail tab 10 and the guide projection 15 may be provided on the inner edge of the outer case 17. As would be understood and accepted by those skilled in the art. In addition, the guide projection 15 may be changed to a guide rib or a guide protrusion structure.

4. In the above embodiment 1, the axial stopper surface 4 is provided on the housing 17 (see fig. 11), and the stopper-acting portion 19 is provided on the tail tab 10 (see fig. 9 and 10). However, the present invention is not limited thereto, and both may be provided at other portions of the tail grip 10 and the housing 17. For example, the rear end surface of the rotation limiting rib 20 inside the housing 17 facing the rear of the lancet is engaged with the front end surface of the inner sleeve 9 of the tail handle 10 facing the front of the lancet, so that the axial limiting surface 4 and the limiting part 19 can be replaced, and the effect of limiting the front end of the tail handle 10 can be achieved.

5. In the above embodiment 1, the passive collision surface 13 is a spiral step surface facing the rear of the lancet on the sleeve structure of the tail handle 10 (see fig. 9). The invention is not limited thereto and the passive impingement surface 13 may also be a helicoid or a ramp. As would be understood and accepted by those skilled in the art.

6. In the above embodiment 1, the rotation positioning slot 11 is disposed on the outer edge of the tail portion of the middle sleeve 11 (see fig. 6), and the rotation positioning block 12 is disposed on the inner edge of the inner sleeve 9 (see fig. 9), which cooperate to form a rotation positioning structure. However, the present invention is not limited to this, and on the one hand, the rotary positioning slot 11 and the rotary positioning block 12 can be exchanged, that is, the rotary positioning block 12 is disposed on the outer edge of the tail portion of the middle sleeve 11, and the rotary positioning slot 11 is disposed on the inner edge of the inner sleeve 9. On the other hand, the rotation positioning slot 11 and the rotation positioning block 12 can be arranged at other positions of the tail handle 10 and the shell 17 instead. For example, the rotation positioning slot 11 is provided on the outer edge of the outer sleeve 8, and the rotation positioning block 12 is provided on the inner edge of the outer shell 17.

7. In the above embodiment 1, the cap 1 is located at the front of the housing 17 and is detachably and fixedly connected with the housing 17 (see fig. 17). However, the present invention is not limited to this, the pen cap 1 and the housing 17 may be designed as an integral structure, the needle outlet hole at the front end of the pen cap 1 is designed as a large hole, the blood collection needle 5 may be directly inserted into the needle base 31 through the large hole at the front end, and the blood collection needle 5 may be directly removed from the large hole at the front end when the needle is removed. The design can avoid the action of disassembling the pen cap 1 during needle installation and simplify the operation. The other situation is that the pen cap 1 is located at the front part of the shell 17 and is detachably and fixedly connected with the shell 17, but a pinhole at the front end of the pen cap 1 is designed to be a small hole, when a needle is installed, the pen cap 1 needs to be firstly detached, and then the blood taking needle 5 is inserted into the needle seat 31.

8. In the above embodiment 1, in the state where the tail knob 10 is in the initial equilibrium position, the guide projection 15 and the guide groove 14 between the tail knob 10 and the housing 17 are arranged in a staggered manner in the axial direction of the lancet, and are in the non-fitting operating state. In this operating state, the depth of penetration during blood collection can be adjusted by turning the tail handle 10. However, the present invention is not limited thereto, and the position allowing the adjustment of the piercing depth is not necessarily arranged at the position where the tail grip 10 is initially balanced, but may be arranged at a position where the tail grip 10 is pulled axially for a certain distance, that is, the tail grip 10 is pulled backwards for a certain distance and then enters the position allowing the adjustment of the piercing depth (in this case, the guide projection 15 and the guide groove 14 are arranged in a staggered manner in the axial direction of the lancet). Of course, it is more reasonable to arrange the tail handle 10 in the initial equilibrium position, which will allow the position of the adjustment of the puncture depth, and the puncture depth can be adjusted at any time as long as the tail handle 10 is in the initial equilibrium position, regardless of whether the blood needle is loaded or not, or whether the blood needle is loaded or not.

9. As is clear from the illustration in embodiment 1 above, the needle detaching lever 27 constitutes a side needle detaching structure for detaching a needle by pushing from the side of the lancet pen. The present invention is not limited to this, and is also applicable to a tail needle removing structure for removing a needle from the tail of a lancet by pushing and pushing. The reason is that the needle unloading protection structure of the invention is irrelevant to the needle unloading at the side part or the tail part and is only relevant to the needle unloading rod. The needle unloading rod is arranged on both the side needle unloading part and the tail needle unloading part. As would be understood and accepted by those skilled in the art.

10. In the above embodiment 1, the active striking surface 7 is provided on the side surface of the tail of the shooting rod 6. The invention is not limited to this and the active striking surface 7 can be designed on the lancet 5.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A blood sampling pen capable of preventing needle unloading due to misoperation after loading comprises a shell, a shooting rod (6) and a needle unloading rod (27);

the shell is a pen shell structure of the blood sampling pen, and an ejection cavity is arranged in the shell;

the ejection rod (6) is an ejection part capable of mounting the blood taking needle (5), the ejection rod (6) is positioned in the ejection cavity, a needle seat (31) for inserting the blood taking needle (5) is arranged at the head of the ejection rod (6), and an upper-chamber locking and unlocking structure is arranged between the ejection rod (6) and the shell;

the needle unloading rod (27) is a needle unloading part of the blood sampling pen, a needle unloading action surface (24) is arranged on the needle unloading rod (27), and the needle unloading action surface (24) is used for pushing and unloading the blood sampling needle (5) arranged on the needle seat (31);

the method is characterized in that: the needle discharging rod (27) is provided with an elastic arm (25), and the elastic arm (25) is provided with a main touch part (26) and a lock tongue (28);

an auxiliary touch part (32) is arranged on the shooting rod (6) corresponding to the main touch part (26), one of the main touch part (26) and the auxiliary touch part (32) is provided with an inclined surface or an arc surface, and the other is provided with a contact point or a contact surface matched with the inclined surface or the arc surface;

a locking notch (33) is arranged on the shell corresponding to the bolt (28), one of the bolt (28) and the locking notch (33) is provided with a first blocking surface, and the other is provided with a second blocking surface matched with the first blocking surface;

when the shooting rod (6) is in a non-loading state relative to the shell, the main touch part (26) on the needle unloading rod (27) is positioned on the motion track of the auxiliary touch part (32) along with loading of the shooting rod (6), and the main touch part (26) and the auxiliary touch part (32) are separated by a certain distance in the axial direction of the blood sampling pen; when the shooting rod (6) moves backwards relative to the shell and is in a loading state, the auxiliary touch part (32) on the shooting rod (6) is in contact with the main touch part (26) on the needle discharging rod (27) and forces the elastic arm (25) to bend and deform, so that the lock tongue (28) on the elastic arm (25) is driven to extend into the lock opening (33) on the shell to occupy space, the needle discharging rod (27) is prevented from moving forwards relative to the shooting rod (6) in a mode that the first blocking surface is opposite to the second blocking surface, and the shooting rod (6) automatically enters a needle discharging protection state after loading.

2. The lancing pen according to claim 1, wherein: the needle unloading rod (27) is provided with a push rod for pushing the blood taking needle (5), the push rod and the elastic arm (25) share the same rod body structure, and the needle unloading action surface (24) is arranged on the end surface of the arm end of the elastic arm (25) facing the needle base (31).

3. The lancing pen according to claim 2, wherein: the needle unloading rod (27) is provided with a manual action part for pushing and unloading the blood taking needle (5), and the manual action part is connected with the push rod on one hand and exposed out of the side part of the blood taking pen on the other hand to form a side needle unloading structure.

4. The lancing pen according to claim 2, wherein: the needle unloading rod (27) is provided with a manual action part for pushing and unloading the blood taking needle (5), and the manual action part is connected with the push rod on one hand and exposed out of the tail part of the blood taking pen on the other hand to form a tail needle unloading structure.

5. The lancing pen according to claim 1, wherein: the needle discharging rod (27) is provided with a pushing rod used for discharging the blood taking needle (5), and the elastic arm (25) is of a branch structure on the pushing rod.

6. The lancing pen according to claim 5, wherein: the needle unloading rod (27) is provided with a manual action part for pushing and unloading the blood taking needle (5), and the manual action part is connected with the push rod on one hand and exposed out of the side part of the blood taking pen on the other hand to form a side needle unloading structure.

7. The lancing pen according to claim 5, wherein: the needle unloading rod (27) is provided with a manual action part for pushing and unloading the blood taking needle (5), and the manual action part is connected with the push rod on one hand and exposed out of the tail part of the blood taking pen on the other hand to form a tail needle unloading structure.

8. The lancing pen according to claim 1, wherein: be equipped with location pothook (34) on the lateral wall of needle file (31), be equipped with positioning groove (35) on the lateral wall of blood taking needle (5) corresponding this location pothook (34), positioning pothook (34) and positioning groove (35) cooperation are fixed blood taking needle (5) on needle file (31) under the dress needle state, make the needle point of blood taking needle (5) fix a position in the blood taking pen axial direction for shooting pole (6) simultaneously to the uniformity of puncture depth when keeping the blood sampling.

9. The lancing pen according to claim 1, wherein: the shell consists of a pen cap (1), a shell (17) and a middle sleeve (2), wherein the pen cap (1) is positioned at the front part of the shell (17) and is detachably and fixedly connected with the shell (17) or is integrally formed with the shell (17); the main body of the middle sleeve (2) is of a cylindrical structure, and the middle sleeve (2) is positioned in the shell (17) and is fixedly connected with the shell (17); the ejection cavity is mainly formed by a cylindrical structure inner cavity of the middle sleeve (2), and the ejection rod (6) is positioned in the cylindrical structure inner cavity of the middle sleeve (2) in an assembly state.