CN111419242B

CN111419242B - Prevent that maloperation from unloading blood sampling pen of needle after loading

Info

Publication number: CN111419242B
Application number: CN202010315944.3A
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: 2021-10-08
Anticipated expiration: 2040-04-21
Also published as: CN111419242A

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 shooting 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 shell is provided with an auxiliary touch part aiming at the main touch part, and the needle unloading rod 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 is novel and reasonable, the technical concept is unique and ingenious, the problem of needle unloading protection of the blood sampling pen without opening a pen cap to load and unload a needle is solved, 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 is solved.

Description

Prevent that maloperation from unloading blood sampling pen of needle 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 shooting rod is provided with an elastic arm which is provided with a main touch part and a lock tongue.

The shell is provided with a main touch part corresponding to the 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 needle unloading rod 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 one of the lock tongue and the locking notch 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 auxiliary touch part on the shell is positioned on the motion track of the main 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 main touch part on the elastic arm is in contact with the auxiliary touch part on the shell 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 notch on the needle unloading rod 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 scheme, the elastic arm is of an L-shaped structure, the opening of the L-shaped structure faces the inner side of the rod body of the injection rod, and an arm crutch is formed at the turning part of the L-shaped structure and faces the outer side of the injection rod; the main trigger part is formed by an arm crank, and the lock tongue is formed by an arm end.

5. In the scheme, the elastic arm is of an arch structure, the opening of the arch structure faces the inner side of the shooting rod body, an arch bulge is formed in the middle of the arch structure, and the arch bulge faces the outer side of the shooting rod; the main touch part is formed by an arch, and the lock tongue is formed by an arm end.

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 shooting rod, and 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; the arm end of the elastic arm is used as a lock tongue. Then, aiming at the main touch part, a secondary touch part is arranged on the shell; a locking notch is arranged on the needle unloading rod 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 shooting rod, arranging the auxiliary touch part on the shell and arranging the lock notch on the needle unloading rod. 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 a perspective view of an embodiment of a lancet of the present invention;

FIG. 2 is an exploded perspective view of a lancet embodiment of the present invention;

FIG. 3 is a perspective view of a sheath in an embodiment of the lancing pen of the present invention;

FIG. 4 is a perspective cross-sectional view of a sheath in an embodiment of the lancet of the present invention;

FIG. 5 is an enlarged view taken at A in FIG. 4;

FIG. 6 is a perspective view of a shoot rod of an embodiment of the lancet of the present invention;

FIG. 7 is an enlarged view of FIG. 6 at B;

FIG. 8 is a perspective view of an outer housing of the blood collection pen of the present invention;

FIG. 9 is a perspective view of a needle-removing shaft of the blood collection pen in accordance with the present invention;

FIG. 10 is an enlarged view at C of FIG. 9;

FIG. 11 is a perspective exploded view of a tail handle of an embodiment of the lancet of the present invention;

FIG. 12 is a perspective view of a tail handle of an embodiment of the lancet of the present invention;

FIG. 13 is a perspective partial cross-sectional view of an ejection rod and ejection chamber of an embodiment of a lancet of the present invention in an initial state;

FIG. 14 is an enlarged view at D of FIG. 13;

FIG. 15 is a perspective partial sectional view of an ejection rod and an ejection chamber of an embodiment of a lancet pen of the present invention in an loaded state;

FIG. 16 is an enlarged view at E of FIG. 15;

FIG. 17 is an initial assembled state view of an embodiment of the lancet of the present invention;

FIG. 18 is a view showing a state in which a lancet is directly inserted from a cap blood collection port according to an embodiment of the lancet of the present invention;

FIG. 19 is a view showing a state in which the lancet is continuously inserted into the lancet according to the embodiment of the present invention;

FIG. 20 is a view showing a locked state in which a lancet is directly pushed into a chamber after a lancet is loaded in an embodiment of the lancet according to the present invention;

FIG. 21 is a state view of the lancet cap removed in the embodiment of the lancet according to the present invention;

FIG. 22 is a view showing a state in which a button is pressed to eject blood collected by the blood collection pen according to the embodiment of the present invention;

FIG. 23 is a view showing the recovery of the natural state of the blood collected by the blood collecting pen according to the embodiment of the present invention;

FIG. 24 is a view showing an initial loading state of the lancet according to the embodiment of the present invention;

FIG. 25 is a view showing a state in which a tail handle is loaded into a chamber of the blood collection pen according to the embodiment of the present invention;

FIG. 26 is a view showing a state after loading with a tail handle is completed in the embodiment of the lancet device according to the present invention;

FIG. 27 is a view showing an initial state of needle removal by pressing the needle-removing pushing handle according to the embodiment of the lancet device of the present invention;

FIG. 28 is a view showing the lancet of the present invention returned to its initial state after the needle is removed.

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; 22. disassembling the needle pushing handle; 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 (b): prevent that maloperation from unloading blood sampling pen of needle after loading

As shown in fig. 1 to 16, the blood sampling pen comprises a pen cap 1, a middle sleeve 2, a shooting rod 6, a needle unloading rod 27, a shell 17, a button 23, a launching spring 30, a return spring 29, an inner sleeve 9, an outer sleeve 8 and a needle unloading push handle 22 (see fig. 2). 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 (see fig. 1 and 12) in the present invention.

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 figures 1 and 2) 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 (see figure 2), and the pen cap 1 and the middle sleeve 2 form plug connection through the plug port. 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 hub 31 (see fig. 6) 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 this embodiment, the sleeve structure of the main body of the tail handle 10 is formed by fixedly connecting the inner sleeve 9 and the outer sleeve 8. 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 and the needle discharging pushing handle 22 are ejector rods of the blood collecting pen for discharging the blood collecting needle 5 (see fig. 2). 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 needle discharging pushing handle 22 is an operating member fixed to the rear of the needle discharging rod 27 for pushing the needle discharging (see fig. 2).

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 shooting rod 6 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 (see fig. 6 and 7). The elastic arm 25 is an L-shaped structure (see figure 7), the opening of the L-shaped structure faces the inner side of the rod body of the shooting rod 6, and an arm crank is formed at the turning part of the L-shaped structure and faces the outer side of the rod shooting. The main trigger 26 is formed by an arm turn and the latch tongue 28 is formed by an arm end (see fig. 7).

The middle sleeve 2 is provided with a secondary triggering part 32 corresponding to the primary triggering part 26 (see fig. 4 and 5), one of the primary triggering part 26 and the secondary triggering 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. In this embodiment, the secondary trigger 32 is a ramp (see FIG. 5) and the primary trigger 26 is a contact point (see FIG. 7). However, both may be exchanged or both may be beveled. As would be understood and accepted by those skilled in the art.

A locking notch 33 (see fig. 10) is arranged on the needle removing rod 27 corresponding to the locking tongue 28, 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 (see fig. 14 and 16).

When the shooting rod 6 is in a non-loading state relative to the shell (see fig. 13 and 14), the auxiliary triggering part 32 on the shell is positioned on the motion track of the main triggering part 26 along with loading of the shooting rod 6, and the main triggering part 26 and the auxiliary triggering 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. 15 and 16), the main trigger part 26 on the elastic arm 25 is contacted with the auxiliary trigger part 32 on the shell 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 needle discharging rod 27 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 this requirement, a positioning hook 34 (see fig. 13 and 15) is provided on the side wall of the needle holder 31, a positioning notch 35 (see fig. 13 and 15) is provided on the side wall of the lancet 5 corresponding to the positioning hook 34, and the positioning hook 34 is engaged with the positioning notch 35 in the needle-loading state to fix the lancet 5 on the needle holder 31, and at the same time, the needle tip of the lancet 5 is positioned in the axial direction of the lancet with respect to the injection rod 6 to maintain the consistency of the puncture depth during blood collection.

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. 8), and the guide projection 15 is provided on the outer edge of the tail tab 10 (see fig. 11 and 12). The length direction of the guide grooves 14 is parallel to the axial line of the blood sampling pen, and the guide grooves 14 are arranged at intervals in the circumferential direction of the blood sampling pen (see fig. 8).

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. 8), and the stopper-acting portion 19 is provided on the tail tab 10 (see fig. 11 to 12).

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 6), and the active impact surface 7 faces the front of the blood sampling pen. A passive impact surface 13 (see fig. 11) 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. 11).

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. 6) 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. 11) 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, a rotation positioning slot 11 is provided on the outer edge of the tail of the middle sleeve 2 (see fig. 3), and a rotation positioning block 12 is provided on the inner edge of the inner sleeve 9 (see fig. 11). 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 inside 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 the rear of the lancet (see fig. 11 and 12).

In this embodiment, a rotation limiting rib 20 (see fig. 8) is provided on the inner edge of the housing 17, and a rotation limiting surface 21 (see fig. 8) 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. 17), the middle sleeve 2 is mainly of a cylindrical structure, 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. 17).

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. 17 is a view showing an initial assembly state of the lancet embodiment of the present invention. The relative positions and relationships between the various components in the initial assembled state can be seen in fig. 17. 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. 17) of the tail handle 10, the other end abuts against the rear end face 16 (not marked in fig. 17) 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 (see fig. 17), the primary trigger 26 of the resilient arm 25 is located on the forward trajectory of the secondary trigger 32 of the housing, and the primary trigger 26 and the secondary trigger 32 are spaced apart in the axial direction of the lancet. The front part of the needle discharging rod 27 is inserted into the needle seat 31 of the front part of the firing rod 6, and the locking notch 33 on the needle discharging rod 27 is positioned in front of the locking tongue 28 on the elastic arm 25.

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

FIG. 18 is a view showing a state in which a lancet is directly inserted from a cap blood collection port according to an embodiment of the blood collection pen 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. State of continuously inserting blood taking needle

FIG. 19 is a view showing a state in which the lancet is continuously inserted into the lancet according to the embodiment of the present invention. As seen in FIG. 19, when the lancet 5 is continuously inserted, the head of the lancet 5 is gradually inserted into the bottom of the needle holder 31, and the needle-removing rod 27 and the needle-removing pushing handle 22 are pushed backward. In the process, the main touching part 26 of the elastic arm 25 gradually approaches the auxiliary touching part 32 on the middle sleeve 2, and the locking notch 33 on the needle discharging rod 27 moves backwards along with the needle discharging rod 27 and gradually approaches the locking tongue 28 on the elastic arm 25.

4. Firing rod cocked locked state

FIG. 20 is a view showing a locked state in which a lancet is directly pushed into a chamber after a lancet is loaded in an embodiment of a lancet according to the present invention. As can be seen from fig. 20, as the blood taking needle 5 is continuously inserted into the needle seat 31, the shooting rod 6 moves backwards along with the blood taking needle, until the shooting rod 6 is loaded and locked, the positioning hook 34 is in clamping fit with the positioning slot 35 to fix the blood taking needle 5 on the needle seat 31, and simultaneously, 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 main trigger part 26 on the elastic arm 25 contacts with the auxiliary trigger part 32 on the shell 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 needle discharging rod 27 to occupy the space, the needle discharging rod 27 is prevented from moving forward relative to the firing rod 6 in a mode that the first blocking surface is opposite to the second blocking surface, and 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.

5. State of removing protective cap

FIG. 21 is a view showing a state where the lancet protecting cap is removed in the embodiment 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.

6. Emission blood sampling state

FIG. 22 is a view showing a state in which a lancet according to an embodiment of the present invention is launched by pressing a button. 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.

7. Recovering to natural state

FIG. 23 is a view showing the recovery of the natural state of the blood after the blood is collected by the blood collecting pen of the embodiment of the present invention. 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.

8. Initial loading state by tail handle

FIG. 24 is a view showing an initial loading state of the lancet according to the embodiment of the present invention by using the tail handle. In this state, the exposed part of the rear part of the tail handle 10 is pulled back manually, the sleeve structure of the tail handle 10 overcomes the elastic force of the return spring 29 and moves axially backwards relative to the shell 17, at this time, 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-matching working state) in the axial direction of the blood sampling pen to the overlapped arrangement in the axial direction of the blood sampling pen and are in a matching working state, at this time, 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.

9. Loading state of tail handle

FIG. 25 is a view showing a state in which a lancet is loaded with a catch according to an embodiment of the present invention. Pulling the tail handle 10 continuously on the basis of the former state, after overcoming the elastic force of the launching spring 30, forcing the passive striking surface 13 to contact with the active striking surface 7 at the rear part of the shooting rod 6 and driving the shooting rod 6 to move backwards relative to the shell 17 until the shooting rod 6 is loaded and locked.

10. After the completion of loading the tail handle

FIG. 26 is a view showing a state after loading with a tail handle is completed in the embodiment of the lancet according to the present invention. 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. 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.

11. Initial state of needle removal

FIG. 27 is a view showing an initial state of needle removal by pushing the needle-removing pushing handle according to the embodiment of the lancet device of the present invention. 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-removing push handle 22 is pressed, the front end face of the needle-removing rod 27 abuts against the end face of the tail part of the blood collection needle 5 and moves forward, and the blood collection needle 5 is held by the needle holder 31, so that 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. When the needle removing push handle 22 is pressed 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 removing rod 27.

12. Resume the initial state

FIG. 28 is a view showing the lancet of the present invention returned to its initial state after the needle is removed. The needle removing push handle 22 is continuously pressed on the basis of the previous state until the blood collection needle 5 is completely ejected by the needle removing rod 27. 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.

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

1. in the above embodiment, the elastic arm 25 has an L-shaped structure (see fig. 7). The present invention is not limited thereto and the resilient arm 25 may be an arch structure (not shown) having an opening facing the inside of the shaft of the shooter 6 and a middle portion forming a dome facing the outside of the shaft. The primary actuation portion 26 is formed by an arch and the latch tongue 28 is formed by an arm end. The resilient arm 25 may also be formed directly in a convex manner as the main trigger 26 and the latch tongue 28. As would be understood and accepted by those skilled in the art.

2. In the above embodiment, the guide groove 14 is provided on the inner edge of the outer case 17 (see fig. 8), and the guide projection 15 is provided on the outer edge of the tail tab 10 (see fig. 11 and 12). 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.

3. In the above embodiment, in the present embodiment, the axial stopper surface 4 is provided on the housing 17 (see fig. 8), and the stopper-acting portion 19 is provided on the tail tab 10 (see fig. 11 to 12). 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.

4. In the above 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. 11). 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.

5. In the above embodiment, the rotation positioning slot 11 is disposed on the outer edge of the tail portion of the middle sleeve 11 (see fig. 3), and the rotation positioning block 12 is disposed on the inner edge of the inner sleeve 9 (see fig. 11), 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.

6. In the above embodiment, 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.

7. In the above embodiment, in the state where the tail handle 10 is in the initial equilibrium position, the guide projection 15 and the guide groove 14 between the tail handle 10 and the housing 17 are arranged in a staggered manner in the axial direction of the lancet, and are in the non-fitting working 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.

8. In the above embodiment, as is clear from the drawings, the needle discharging lever 27 and the needle discharging push handle 22 constitute a needle discharging structure for discharging a needle from the rear of the lancet by pressing. The present invention is not limited to this, and is also applicable to a needle discharge structure for discharging a needle by pushing and pushing from the side of a lancet. The reason is that the needle unloading protection structure of the invention is irrelevant to the needle unloading at the tail part or the side part and is only relevant to the needle unloading rod. The needle unloading rod is arranged on both the tail needle unloading part and the side needle unloading part. As would be understood and accepted by those skilled in the art.

9. In the above embodiment, the active striking surface 7 is provided on the side of the rear portion 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 shooting rod (6) 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 shell 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 lock opening (33) is arranged on the needle unloading rod (27) corresponding to the lock tongue (28), one of the lock tongue (28) and the lock opening (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 auxiliary touch part (32) on the shell is positioned on the motion track of the main touch part (26) 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 main trigger part (26) on the elastic arm (25) is in contact with the auxiliary trigger part (32) on the shell 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 needle discharging rod (27) 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 being loaded.

2. The lancing pen according to claim 1, wherein: the elastic arm (25) is of an L-shaped structure, the opening of the L-shaped structure faces the inner side of the rod body of the injection rod (6), and an arm crutch is formed at the turning part of the L-shaped structure and faces the outer side of the injection rod; the primary trigger (26) is formed by an arm throw and the bolt (28) is formed by an arm end.

3. The lancing pen according to claim 1, wherein: the elastic arm (25) is of an arch structure, the opening of the arch structure faces the inner side of the rod body of the shooting rod (6), an arch bulge is formed in the middle of the arch structure, and the arch bulge faces the outer side of the shooting rod; the main trigger (26) is formed by an arch and the latch tongue (28) is formed by an arm end.

4. 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.

5. 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), the ejection rod (6) is positioned in the cylindrical structure inner cavity of the middle sleeve (2) in an assembly state, and the auxiliary touch part (32) is arranged on the inner wall of the cylindrical structure of the middle sleeve (2).