Blood lancet

Abstract

The application discloses a blood sampling pen, which comprises a shell, a shooting rod and a shooting spring, one of the shell and the shooting rod is provided with a spring arm structure, and the other is provided with a chambering cooperation part; the spring arm structure is provided with a blocking part for limiting the backward displacement of the shooting rod and a deformation part for bearing external force to deform; the blood sampling pen further comprises a pushing device; the pushing device is assembled at the front part of the shell, the front end of the pushing device is provided with a blood sampling surface for abutting against the skin of a patient and bearing pressing force; and the pushing device is provided with a pushing action part which is towards the rear end and cooperates with the spring arm structure. The blood sampling pen is directly inserted into the blood sampling needle from the head to realize chambering, the chambering mode is coherent with the action of inserting the blood sampling needle from the front end, the user can complete the chambering operation while inserting the blood sampling needle, the operation steps are optimized, the blood sampling can be directly triggered by pressing the head, and the nervousness in the blood sampling process can be reduced.

Description

Technical Field

[0001] This invention relates to the field of blood collection equipment technology, specifically to a blood collection pen for peripheral blood collection. Background Technology

[0002] The statements in this section are merely background information related to this application and do not necessarily constitute prior art.

[0003] A lancing pen is a blood collection device used in conjunction with a disposable lancet. The lancing pen is reusable, while the lancet is for single use only to prevent cross-infection. Lancing pens have been developed over several decades, undergoing numerous improvements. Currently, lancing pens are gradually maturing. However, throughout their development, improving the safety, reliability, convenience, economy, and user experience of lancing pens has remained a focus for those skilled in the art.

[0004] Currently, conventional blood collection pens, such as the Chinese patent CN111419244B, which has been granted a patent number of 202010315956.6 entitled "Blood Collection Pen with Tail Pull Hand for Loading and Depth Adjustment", use a tail pull hand for loading and a side button to release the limit on the firing rod and release the elastic force of the firing spring to collect blood.

[0005] In the process of developing this application, the applicant discovered that the method of using a tail lever for loading and a side button for firing has at least the following aspects that require further optimization and improvement:

[0006] 1. After inserting the lancing device into the firing rod, the side-button firing method is prone to accidental triggering, which may cause the lancing needle to be in the firing completed state. At this time, it is necessary to switch hands and pull the tail lever to reload, which increases the number of operation steps and needs to be optimized.

[0007] 2. The side-button firing method requires patients to place the lancing device against their skin before pressing the button, which can cause anxiety and negatively impact user experience.

[0008] In view of this, how to solve the shortcomings of the existing blood collection pen loading and firing methods has become the subject of this invention. Summary of the Invention

[0009] The purpose of this invention is to provide a blood collection pen.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The present invention proposes a lancing pen, comprising a housing, a firing rod, and a firing spring. The housing is the pen shell structure of the lancing pen, and a firing cavity is provided inside the housing. The firing rod is a firing component with a head into which a lancing needle can be inserted, and the firing rod is located inside the firing cavity of the housing. A loading locking and unlocking structure is provided between the firing rod and the housing. The firing spring is an elastic component on the lancing pen used to provide firing force, and the firing spring acts in the firing direction of the firing rod.

[0011] The casing and the firing rod are equipped with a projectile arm structure on one and a chambering engagement part on the other; the projectile arm structure is equipped with a blocking part for limiting the rearward displacement of the firing rod and a deformation part for bearing the deformation caused by external force.

[0012] The loading chamber acts on the projectile arm structure, and the component where the loading chamber is located is also provided with a firing limiting surface facing the front end for abutting against the blocking part on the projectile arm structure.

[0013] The lancing pen also includes a pusher; the pusher is mounted on the front of the housing, and the front end of the pusher has a lancing surface for pressing against the patient's skin and bearing pressure; the pusher has a pushing action part facing the rear end and cooperating with the spring arm structure.

[0014] The blood collection pen is configured to have a loaded and firing state.

[0015] In the loaded state, the gun rod is inserted into the blood collection needle from the head and a force is applied toward the rear end. When the gun rod moves backward, the loading engagement part forces / releases the deformation part of the cartridge arm structure to deform radially until the loading engagement part passes the blocking part of the cartridge arm structure. At this time, the deformation of the deformation part is restored. The firing limiting surface and the blocking part on the cartridge arm structure limit the forward movement of the gun rod, and the needle tip of the blood collection needle is located at the rear end of the blood collection surface on the pusher.

[0016] In the firing state, the blood collection surface of the pusher is pressed against the human skin, applying pressure towards the rear end and causing the pusher to move backward. The pushing action of the pusher forces / releases the deformation part of the spring arm structure to deform radially until the blocking part on the spring arm structure releases the restriction on the forward movement of the firing limiting surface. The firing spring drives the firing rod forward and causes the needle tip of the blood collection needle to pass through the blood collection surface and pierce the human skin.

[0017] The relevant content of this invention is explained as follows:

[0018] 1. In the above-mentioned technical solution of the present invention, in view of the existing needle loading method, firing method and corresponding structure of the lancing pen, the lancing pen of the present invention mainly changes the loading method to head loading and the firing method to head-triggered firing. In the head loading and head-triggered structure, a spring arm structure and a loading engagement part are provided on the shell and the firing rod. The head loading and head-triggered functions are realized by a pusher assembled at the front of the shell and cooperating with the spring arm structure. When the head is loaded, the lancing needle inserted from the front end drives the firing rod to move backward, and the spring arm structure and the loading engagement part cooperate. During the head loading process, the firing rod inserts the lancing needle from the head and applies a force towards the rear end. When the firing rod moves backward, the loading engagement part forces / releases the deformation part of the spring arm structure to deform radially until the loading engagement part passes the blocking part of the spring arm structure, and the deformation of the deformation part returns to its original state. At this time, the firing limiting surface cooperates with the blocking part on the spring arm structure to limit the forward movement of the firing rod. During the head-triggered firing process, the blood collection surface of the pusher When pressed against the skin, a pressure is applied towards the rear end, causing the pusher to move backward. The pushing action of the pusher forces / releases the deformation part of the spring arm structure to deform radially until the blocking part on the spring arm structure releases the restriction on the forward movement of the firing limit surface. The firing spring then drives the firing rod forward, causing the needle tip of the lancet to pass over the blood collection surface and pierce the skin. Thus, this application cleverly utilizes the structure of the spring arm and its cooperation with the loading part and the pusher to achieve direct insertion of the lancet into the head for loading. The loading method is continuous with the action of inserting the lancet from the front end, allowing the user to complete the loading operation simultaneously with inserting the lancet. The operation steps are optimized, and blood collection can also be triggered directly by pressing the head, making it convenient to use. Compared with other lancets that use buttons for firing, which can cause patient anxiety, this reusable lancet (excluding the lancet) can reduce anxiety during the blood collection process, making it more convenient and easier to use, and improving the user experience and comfort for patients using it at home.

[0019] 2. In the above technical solution, the spring arm structure is either integrally formed with the housing or separately formed. The spring arm structure can be set on the housing, and the setting method can be either integral or separate. When it is integrally formed, there are fewer parts, which facilitates assembly.

[0020] 3. In the above technical solution, the deformable part of the bullet arm structure is arranged to be sleeved on the outside of the upper chamber fitting part and the pushing action part of the pusher;

[0021] In the loaded state, the deformable part of the projectile arm structure expands outward radially under the action of the loading mating part, and the blocking part of the projectile arm structure also expands accordingly. After the loading mating part passes the deformable part, the inner diameter of the deformable part shrinks and recovers, and the blocking part of the projectile arm structure shrinks and abuts against the firing limiting surface.

[0022] In the firing state, the deformable portion of the projectile arm structure expands radially outward under the action of the pusher's pushing part, causing the blocking portion of the projectile arm structure to expand and release its restriction on the firing limiting surface, thereby enabling the firing rod to move forward.

[0023] This design allows the cartridge arm structure to be placed on the inner wall of the casing, the loading engagement part to be placed on the firing rod, and the pusher's pushing action part to be placed inside the cartridge arm structure. This structure works together to load the head into the chamber using the loading engagement part and the cartridge arm structure, and to trigger the head by using the pusher and the cartridge arm structure. The design is reasonable and makes more scientific use of the internal space of the casing.

[0024] 4. In the above technical solution, the deformable part of the bullet arm structure is arranged to be sleeved inside the upper chamber fitting part and the pushing action part of the pusher;

[0025] In the loaded state, the deformable part of the projectile arm structure shrinks radially inward under the action of the loaded engagement part, and the blocking part of the projectile arm structure also shrinks accordingly. After the blocking part at the rear end of the projectile arm structure passes over the loaded engagement part of the housing, the inner diameter of the deformable part increases and recovers. Then, the blocking part of the projectile arm structure expands and abuts against the firing limiting surface.

[0026] In the firing state, the deformable part of the projectile arm structure shrinks radially inward under the action of the pusher, which causes the blocking part of the projectile arm structure to shrink and release the restriction on the firing limiting surface, thereby enabling the firing rod to move forward.

[0027] This design allows the cartridge arm structure to be mounted on the firing rod, the loading engagement part to be mounted on the inner wall of the housing, and the pusher's pushing action part to be mounted on the outer side of the cartridge arm structure. This enables the use of the loading engagement part and the cartridge arm structure to load the head into the gun, and the use of the pusher and the cartridge arm structure to trigger the head. The structure is compact and the engagement process is smooth.

[0028] 5. In the above technical solution, the lancing pen also has an initial state; taking the rear-facing face of the blocking part in the bullet arm structure as a reference, in the initial state, the pushing action part and the loading engagement part of the pusher are both located on the front side of the rear-facing face; in the loading state, the pushing action part of the pusher is located on the front side of the rear-facing face, and the loading engagement part and the limiting surface of the firing rod are located on the rear-facing face after passing the blocking part; in the firing state, the pushing action part of the pusher is located on the front side of the rear-facing face, and the loading engagement part and the firing limiting surface are located on the front side of the rear-facing face after passing the blocking part. This positional design ensures that the positional distribution of the pushing action part and the loading engagement part relative to the blocking part in the bullet arm structure is determined in all states of the lancing pen, facilitating the research and development design of each component of the lancing pen and also facilitating production and assembly.

[0029] 6. In the above technical solution, when the firing rod is in the loaded state, after the limiting surface on the firing rod abuts against the blocking part on the cartridge arm structure, the distance between the needle tip of the blood collection needle and the blood collection surface is greater than the stroke of the blood collection surface of the pusher being pressed in the firing state. This avoids the skin from contacting the needle tip of the blood collection needle during the pressing of the pusher, before the blood collection needle is launched by the firing rod and the firing spring, further improving safety.

[0030] 7. In the above technical solution, the lancing pen further includes a push-and-reset spring. One end of the push-and-reset spring acts on the housing, and the other end acts on the pusher. The pusher has a reset surface for abutting against the push-and-reset spring. The push-and-reset spring is a structure that provides the pusher with a tendency to move towards the front end. This design of the push-and-reset spring enables the pusher to automatically extend and retract after the lancing pen head is triggered, ensuring that the pusher head always faces the front end. During use, the head moves inward and retracts. After use, the pusher automatically returns to its original position under the action of the spring. This ingenious design provides a better user experience with its automatic extension and retraction function.

[0031] 8. In the above technical solution, the two spring arm structures are symmetrically arranged on the periphery of the housing, and each spring arm structure has a push-limiting surface at the front end position that abuts against the push-release return spring. This design can better realize the automatic extension and retraction function, making the force on the pusher more even and avoiding jamming during use.

[0032] 9. In the above technical solution, the housing consists of an outer shell and a middle sleeve. The middle sleeve is a cylindrical structure and is fixedly connected to the inside of the outer shell. The spring arm structure is located on the middle sleeve. This design constitutes the cylindrical housing structure of the blood collection pen. By placing the spring arm structure on the cylindrical middle sleeve, the firing rod and the pusher can be placed inside the inner wall of the middle sleeve. The structural design is more reasonable and facilitates assembly and use.

[0033] 10. In the above technical solution, a guide block is provided on the periphery of the pusher, and a guide groove is correspondingly provided on the middle sleeve, with the guide block and the guide groove slidingly engaged. This guides the movement of the pusher, stabilizes its trajectory when it is driven backward in the firing state, and makes the relative engagement (deformation relief) process between it and the projectile arm structure smoother.

[0034] 11. In the above technical solution, the pusher includes two support corners located at the rear end, and the pushing action part is located at the rear end of the support corners. This allows the pusher to better extend into the middle sleeve and cooperate with the spring arm structure, resulting in a reasonable structural design that facilitates assembly and use.

[0035] 12. In the above technical solution, an annular protrusion is provided in the middle part of the firing rod body, the loading mating part is provided on the rearward side of the annular protrusion, and the firing limiting surface is provided on the frontward side of the annular protrusion. This ingenious design sets the loading mating part and the firing limiting surface on the same annular protrusion, which simplifies the structure of the blood collection pen, facilitates production and assembly, and has a reasonable position setting, thus playing a good role in loading and limiting during firing.

[0036] 13. In the above technical solution, the loading engagement part forms a guide slope on the rearward side of the annular protrusion, so as to drive the deformation part of the bullet arm structure to deform better in the loading state. When the loading engagement part contacts the blocking part of the bullet arm structure, it expands (or shrinks) obliquely with the guide slope, so that the deformation process of the deformation part is not sudden but has a gradual process, which makes the loading feel better and also makes the bullet arm structure of the blood collection pen have a longer service life.

[0037] 14. In the above technical solution, the lancing pen also includes a pen cap, which is detachably and fixedly connected to the front of the housing. The pen cap is fitted on the outside of the pusher, and the pen cap has a through hole for the pusher to extend toward the front end. This pen cap design allows the lancing pen to have more functions and facilitates the assembly and use of other components. After the lancing pen is fired, the needle can be removed directly without removing the pen cap.

[0038] 15. In the above technical solution, the front end of the hair pusher has a radially deformable pressing part, so that the hair pusher can be assembled into the through hole of the pen cap when the pressing part is radially contracted. The blood collection surface is located at the front end of the pressing part. This design allows the hair pusher to be better assembled with the pen cap.

[0039] 16. In the above technical solution, the rearward surface of the pressing part is provided with a push-limiting surface for acting on the front end of the pen cap, so as to limit the stroke of the pusher after it is pressed and prevent the pusher from falling out by the pen cap.

[0040] 17. In the above technical solution, a window is provided on the pen cap, and the window is set in accordance with the movement path of the blood collection needle on the gun rod. The position of the window can distinguish between loaded and unloaded, which can remind the user to be careful of needle firing and avoid accidental injury.

[0041] 18. In the above technical solution, the position of the window is configured to have at least the following:

[0042] In its initial state, the lancet is not installed in the injection rod, and the projection position of the viewing window is directly opposite the position of the injection rod. Before use, the color of the injection rod (e.g., white) can be seen in the pen cap window, indicating that the pen is unloaded. There may or may not be a needle inside; the injection rod will not fire, thus preventing accidental injury.

[0043] In the loaded state, the lancet is inserted into the firing rod and pressed backward to load the gun. The projection position of the viewing window is directly opposite the position of the lancet. With the lancet loaded, the firing rod moves backward and retracts into the inner sleeve. The lancet is visible in the viewing window, and its color is visible. The firing rod fires, allowing blood to be collected. This serves as a warning to the user to be careful of needle injury, preventing accidental injury. If no lancet is available and the gun is loaded using other methods, such as pulling the tail lever, the firing rod moves backward and retracts into the inner sleeve. The white firing rod is not visible in the viewing window, and the viewing window area is empty, appearing black. The firing rod fires, but because there is no needle, accidental injury is avoided.

[0044] In the firing state, the firing rod is released from the forward movement restriction and fires forward. The projection position of the window is directly opposite the position of the firing rod. After use, the color of the firing rod can be seen. The front end of the firing rod is also equipped with a blood collection needle to remind the user to avoid injury.

[0045] 19. In the above technical solution, the viewing window is located at two positions around the pen cap, so that the user does not need to rotate the lancing pen all the way to see the viewing window. Preferably, the viewing window is symmetrically set on both sides of the pen cap, which is reasonable and easy to observe.

[0046] 20. In the above technical solution, the pen cap is made of transparent material at least at the viewing window position, making the viewing window easier and clearer to observe. Preferably, the entire pen cap is made of transparent plastic, reducing the difficulty of the manufacturing process.

[0047] 21. In the above technical solution, the pen cap at least partially overlaps the hair pusher in the circumferential direction, the window is opened at the overlapping part, and a notch is opened on the hair pusher at the position corresponding to the window.

[0048] 22. In this invention, the term "forward" in "forward," "front end," etc., refers to the direction pointed to by the needle tip or the firing direction of the needle core, which is the direction of blood collection. The term "rear end," "rear part," etc., refers to the direction pointed to by the tail of the casing or the opposite direction of the firing direction of the needle core.

[0049] Due to the application of the above-mentioned solution, the present invention has the following advantages and effects compared with the prior art:

[0050] 1. The present invention addresses the existing needle loading and firing methods and their corresponding structures of blood collection pens. The blood collection pen of the present invention primarily changes the loading method to head-loading and the firing method to head-triggered firing. In the head-loading and head-triggered structure, a spring arm structure and a loading engagement part are provided on the housing and firing rod. The head-loading and head-triggered functions are achieved by a pusher assembled at the front of the housing and cooperating with the spring arm structure. During head-loading, the blood collection needle inserted from the front end drives the firing rod to move backward, mainly due to the cooperation between the spring arm structure and the loading engagement part. During head-triggered firing, the cooperation between the pusher and the spring arm structure is mainly involved. The blood collection surface of the pusher is pressed against the human skin, applying pressure towards the rear end and driving the pusher to move backward. The pushing action part of the pusher forces / releases the deformation part of the spring arm structure to undergo radial deformation until the blocking part on the spring arm structure releases the restriction on the forward movement of the firing limiting surface. The firing spring drives the firing rod forward, causing the needle tip of the blood collection needle to pass over the blood collection surface and pierce the human skin.

[0051] 2. The solution of this invention cleverly utilizes the structure of the spring arm and its cooperation with the loading part and the pusher to achieve the ability to directly insert the blood collection needle into the head for loading. The loading method is continuous with the action of inserting the blood collection needle from the front end. The user can complete the loading operation at the same time as inserting the blood collection needle, thus optimizing the operation steps. Blood collection can also be triggered directly by pressing the head, which is convenient to use. Compared with other blood collection pens that use buttons to fire, which can cause patients to feel nervous, this reusable blood collection pen (excluding the blood collection needle) can reduce the tension during the blood collection process, making the blood collection process more convenient and easy to use, and also improving the user experience and comfort of patients when using it at home.

[0052] 3. In the solution of the present invention, the trigger structure of the head of the lancing pen enables the lancing needle to fire simultaneously when the pusher is pressed against the skin, avoiding insufficient blood collection caused by the weak contact between the lancing pen and the skin in traditional lancing pens; in addition, the trigger structure of the head of the lancing pen can facilitate the squeezing out of blood after puncture, reducing the need for massage and squeezing to cause bleeding after puncture in traditional lancing pens. Attached Figure Description

[0053] Figure 1This is a cross-sectional view of Embodiment 1 of the present invention in its initial state;

[0054] Figure 2 This is a cross-sectional view of the blood collection needle before insertion in Embodiment 1 of the present invention;

[0055] Figure 3 A cross-sectional view of the blood collection needle being inserted into the loading position according to Embodiment 1 of the present invention;

[0056] Figure 4 This is a three-dimensional cross-sectional schematic diagram of the blood collection needle being inserted into the loading chamber in Embodiment 1 of the present invention.

[0057] Figure 5 This is a cross-sectional view of the head of the device being loaded and entering the loading state according to Embodiment 1 of the present invention.

[0058] Figure 6 This is a cross-sectional view of the blood collection needle with the button removed according to Embodiment 1 of the present invention;

[0059] Figure 7 This is a cross-sectional view of Embodiment 1 of the present invention, showing the pusher being pressed and triggered by the head to prepare for firing.

[0060] Figure 8 This is a cross-sectional view of the blood collection pen in the firing state according to Embodiment 1 of the present invention;

[0061] Figure 9 This is a perspective view of the firing rod in Embodiment 1 of the present invention;

[0062] Figure 10 This is a cross-sectional view of the firing rod in Embodiment 1 of the present invention;

[0063] Figure 11 This is a perspective view of the sleeve in Embodiment 1 of the present invention;

[0064] Figure 12 This is a cross-sectional view of the sleeve in Embodiment 1 of the present invention;

[0065] Figure 13 This is a perspective view of the firing rod and the middle set assembled according to Embodiment 1 of the present invention;

[0066] Figure 14 This is a cross-sectional view of the firing rod and the middle assembly according to Embodiment 1 of the present invention;

[0067] Figure 15 This is a perspective view of the pusher of Embodiment 1 of the present invention;

[0068] Figure 16 This is a cross-sectional view of the pusher of Embodiment 1 of the present invention;

[0069] Figure 17 This is a cross-sectional view of Embodiment 2 of the present invention in its initial state;

[0070] Figure 18 This is a cross-sectional view of Embodiment 2 of the present invention in the loaded state;

[0071] Figure 19 This is a cross-sectional view of Embodiment 2 of the present invention, showing the pusher being pressed and triggered by the head to prepare for firing.

[0072] Figure 20 This is a cross-sectional view of Embodiment 2 of the present invention in the launching state;

[0073] Figure 21 This is a schematic diagram of the appearance of Embodiment 3 of the present invention in its initial state;

[0074] Figure 22 This is a cross-sectional view of Embodiment 3 of the present invention in its initial state;

[0075] Figure 23 This is a schematic diagram of the appearance of Embodiment 3 of the present invention in the state where the blood collection needle is not inserted and the gun is loaded;

[0076] Figure 24 This is a cross-sectional view of Embodiment 3 of the present invention with the blood collection needle not inserted and the gun loaded;

[0077] Figure 25 This is a schematic diagram of the appearance of Embodiment 3 of the present invention with the blood collection needle inserted and loaded.

[0078] Figure 26 This is a cross-sectional view of a schematic diagram of Embodiment 3 of the present invention with the blood collection needle inserted and loaded.

[0079] Figure 27 This is a schematic diagram of the appearance of Embodiment 3 of the present invention in the state of insertion of the blood collection needle and firing.

[0080] Figure 28 This is a cross-sectional view of Embodiment 3 of the present invention in the state of insertion of the blood collection needle and firing.

[0081] Figure 29 This is a perspective view of the pen cap in Embodiment 3 of the present invention.

[0082] The parts shown in the above attached diagram are illustrated below:

[0083] 1. Shell;

[0084] 11. Outer shell;

[0085] 12. Middle sleeve; 121. Guide groove; 122. Sliding support surface;

[0086] 2. Shooting rod; 21. Annular protrusion; 22. Spring arm; 221. Bend or arc segment;

[0087] 3. Launching spring; 4. Spear arm structure; 41. Blocking part; 42. Deformation part; 51. Loading chamber mating part; 511. Guide slope; 52. Launching limiting surface; 6. Pusher; 61. Pressing part; 611. Blood collection surface; 612. Pushing limiting surface; 62. Support angle; 621. Pushing action part; 63. Guide block; 7. Pushing return spring; 8. Pen cap; 81. Viewing window; 9. Blood collection needle. Detailed Implementation

[0088] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0089] Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0090] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.

[0091] The terms "first," "second," etc., used in this article do not specifically refer to order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.

[0092] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.

[0093] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0094] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the case.

[0095] The terms “front,” “back,” “up,” and “down” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not used to limit the specific direction of the protection scheme and its actual implementation.

[0096] This invention addresses the issues of complex loading procedures and user anxiety caused by pressing side buttons when launching blood collection pens. It features a clever and targeted improvement: the loading method is changed to head-loading, and the firing method is head-triggered. Users can load the pens simultaneously with inserting the needle, optimizing the process. Blood collection can also be triggered directly by pressing the head button, making it convenient and reducing user anxiety during the blood collection process.

[0097] See Figures 1 to 28 As shown in the figure, this embodiment of the invention proposes a lancing pen, including a housing 1, a firing rod 2, and a firing spring 3. The housing 1 is the pen shell structure of the lancing pen, and a firing cavity is provided inside the housing 1. The firing rod 2 is a firing component with a head that can be inserted into a lancing needle 9, and the firing rod 2 is located inside the firing cavity of the housing 1. A loading locking and unlocking structure is provided between the firing rod 2 and the housing 1. The firing spring 3 is an elastic component on the lancing pen used to provide firing force, and the firing spring 3 acts in the firing direction of the firing rod 2.

[0098] The housing 1 and the firing rod 2 are provided with a projectile arm structure 4 on one and a loading engagement part 51 on the other; the projectile arm structure 4 is provided with a blocking part 41 for limiting the rearward displacement of the firing rod 2 and a deformation part 42 for bearing the deformation caused by external force.

[0099] The chambering engagement part 51 acts on the projectile arm structure 4, and the component where the chambering engagement part 51 is located is also provided with a firing limiting surface 52 facing the front end for abutting against the blocking part 41 on the projectile arm structure 4.

[0100] The lancing pen also includes a pusher 6; the pusher 6 is mounted on the front of the housing 1, and the front end of the pusher 6 has a lancing surface 611 for pressing against the patient's skin and bearing pressure; the pusher 6 has a pushing action part 621 facing the rear end and cooperating with the spring arm structure 4.

[0101] The above components are used in a blood collection pen that is configured to have a loaded and firing state. The usage states are as follows:

[0102] In the loaded state, the firing rod 2 is inserted into the blood collection needle 9 from the head and a force is applied toward the rear end. When the firing rod 2 moves backward, the loading engagement part 51 forces / releases the deformation part 42 of the projectile arm structure 4 to deform radially until the loading engagement part 51 passes the blocking part 41 of the projectile arm structure 4, and the deformation of the deformation part 42 is restored. At this time, the firing limiting surface 52 and the blocking part 41 on the projectile arm structure 4 limit the forward movement of the firing rod 2, and the needle tip of the blood collection needle 9 is located at the rear end of the blood collection surface 611 on the pusher 6.

[0103] In the firing state, the blood collection surface 611 of the pusher 6 is pressed onto the human skin, applying a pressing force towards the rear end and driving the pusher 6 to move backward. The pushing action part 621 of the pusher 6 forces / releases the deformation part 42 of the spring arm structure 4 to deform radially until the blocking part 41 on the spring arm structure 4 releases the restriction on the forward movement of the firing limiting surface 52. The firing spring 3 drives the firing rod 2 to fire forward and causes the needle of the blood collection needle 9 to pass through the blood collection surface 611 and pierce the human skin.

[0104] The main improvement of the above embodiments of the present invention is that the loading method is changed to head-loading and the firing method is head-triggered firing. In the head-loading and head-triggered structure, a cooperating arm structure 4 and a loading engagement part 51 are provided on the housing 1 and the firing rod 2. The head-loading and head-triggered functions are achieved by a pusher 6 assembled at the front of the housing 1 and cooperating with the arm structure 4. During head-loading, the blood collection needle 9 inserted from the front end drives the firing rod 2 to move backward, and the arm structure 4 and the loading engagement part 51 cooperate. During head-loading, the firing rod 2 inserts the blood collection needle 9 from the head and applies a force towards the rear end. When the firing rod 2 moves backward, the loading engagement part 51 forces / releases the radial deformation of the deformation part 42 of the arm structure 4 until the loading engagement part 51 passes the blocking part 41 of the arm structure 4, at which point the deformation of the deformation part 42 returns to its original state. At this time, the firing limiting surface 52 and the blocking part 41 on the arm structure 4 are engaged for counter-firing. The forward movement of lever 2 is restricted. During the head-triggered firing process, the blood collection surface 611 of the pusher 6 is pressed against the human skin, applying a pressure towards the rear end and driving the pusher 6 to move backward. The pushing action part 621 of the pusher 6 forces / releases the deformation part 42 of the spring arm structure 4 to deform radially until the blocking part 41 on the spring arm structure 4 releases the restriction on the forward movement of the firing limiting surface 52. The firing spring 3 drives the firing lever 2 forward and causes the needle tip of the blood collection needle 9 to pass through the blood collection surface 611 and pierce the human skin. It can be seen that this application cleverly utilizes the structure of the spring arm structure 4 and its cooperation with the loading engagement part 51 and the pusher 6 to realize that the blood collection needle 9 can be directly inserted from the head for loading. The loading method is continuous with the action of inserting the blood collection needle 9 from the front end. The user can complete the loading operation at the same time as inserting the blood collection needle 9. The operation steps are optimized. Blood collection can also be directly triggered by pressing the head, which is convenient and provides a good user experience.

[0105] In the above embodiments of the present invention, the lancing pen also has an initial state; taking the rear end face of the blocking part 41 in the spring arm structure 4 as a reference, such as Figure 1 As shown, in the initial state, the pushing action part 621 and the upper chamber engagement part 51 of the pusher 6 are both located on the front end side of the rear end face; as Figure 5As shown, in the loaded state, the pushing action part 621 of the pusher 6 is located on the front end side of the rear end face, and the loading engagement part 51 and the limiting surface of the firing rod 2 are located on the rear end side of the rear end face after passing the blocking part 41; as Figure 8 As shown, in the firing state, the pushing action part 621 of the pusher 6 is located on the front end side of the rear end face, and the loading engagement part 51 and the firing limiting surface 52 are located on the front end side of the rear end face after passing over the blocking part 41. This design ensures that the positions of the pushing action part 621 and the loading engagement part 51 relative to the blocking part 41 in the bullet arm structure 4 are determined in all states of the blood collection pen, facilitating the research and development design of each component of the blood collection pen and also simplifying production and assembly.

[0106] In the above embodiments of the present invention, when the firing rod 2 is in the loaded state, after the limiting surface abuts against the blocking part 41 on the cartridge arm structure 4, the distance between the needle tip of the blood collection needle 9 and the blood collection surface 611 is greater than the stroke of the blood collection surface 611 of the pusher 6 being pressed in the firing state. This is to prevent the skin from contacting the needle tip of the blood collection needle 9 when the blood collection needle 9 is not fired by the firing rod 2 and the firing spring 3 during the pressing of the pusher 6, further improving safety.

[0107] In the above embodiments of the present invention, such as Figure 1 As shown, the lancing pen also includes a push-and-reset spring 7. One end of the push-and-reset spring 7 acts on the housing 1, and the other end acts on the pusher 6. The pusher 6 has a reset surface for abutting against the push-and-reset spring 7. The push-and-reset spring 7 is a structure that provides the pusher 6 with a tendency to move towards the front end. This design of the push-and-reset spring 7 enables the pusher 6 to automatically extend and retract after the lancing pen head is triggered, ensuring that the head of the pusher 6 always faces the front end. During use, the head moves inward and retracts. After use, the pusher 6 automatically returns to its original position under the action of the spring. This ingenious design provides a better user experience with its automatic extension and retraction function.

[0108] In the above embodiments of the present invention, such as Figure 1 As shown, the two spring arm structures 4 are symmetrically arranged on the periphery of the housing 1. Each spring arm structure 4 has a push-limiting surface 612 at the front end that abuts against the push-release spring 7. This design can better realize the automatic extension and retraction function, making the force on the pusher 6 more even and avoiding jamming during use.

[0109] In the above embodiments of the present invention, such as Figure 1As shown, the housing 1 consists of an outer shell 11 and a middle sleeve 12. The middle sleeve 12 is mainly cylindrical and is fixedly connected to the inside of the outer shell 11. The spring arm structure 4 is provided on the middle sleeve 12. This design constitutes the cylindrical housing 1 structure of the blood collection pen. By placing the spring arm structure 4 on the cylindrical middle sleeve 12, the firing rod 2 and the pusher 6 can be placed inside the inner wall of the middle sleeve 12. The structural design is more reasonable and facilitates assembly and use.

[0110] like Figure 15 , Figure 16 As shown, in the above embodiment of the present invention, a guide block 63 is provided on the periphery of the pusher 6, and a guide groove 121 is correspondingly provided on the middle sleeve 12 (see...). Figure 12 The guide block 63 slides into the guide groove 121. This guides the movement of the pusher 6, stabilizes its trajectory when it is driven backward in the firing state, and makes the relative engagement (deformation release restriction) between it and the projectile arm structure 4 smoother.

[0111] like Figure 15 , Figure 16 As shown, in the above embodiment of the present invention, the pusher 6 includes two support corners 62 located at the rear end, and the pushing action part 621 is located at the rear end of the support corners 62. This structure allows the pusher 6 to better extend into the middle sleeve 12 and cooperate with the spring arm structure 4. The structure is reasonably designed and easy to assemble and use.

[0112] In the above embodiments of the present invention, the spring arm structure 4 is integrally formed with the housing 1 or separately formed. The spring arm structure 4 can be set on the housing 1, and the setting method can be integral or separate. When it is integral, there are fewer parts, which facilitates assembly.

[0113] The technical solution of the present invention will now be described in more detail with reference to various specific embodiments.

[0114] Example 1, as Figures 1 to 8 As shown, in Embodiment 1 of the present invention, a lancing pen is proposed, comprising a housing 1, a lancet 2, and a launching spring 3. The housing 1 is the pen shell structure of the lancing pen, and a ejection cavity is provided inside the housing 1. The lancet 2 is a launching component with a head into which a lancing needle 9 can be inserted, and the lancet 2 is located inside the ejection cavity of the housing 1. A loading locking and unlocking structure is provided between the lancet 2 and the housing 1. The launching spring 3 is an elastic component on the lancing pen used to provide ejection force, and the launching spring 3 acts in the ejection direction of the lancet 2.

[0115] The shell 1 is provided with a projectile arm structure 4, and the firing rod 2 is provided with a chambering mating part 51; the projectile arm structure 4 is provided with a blocking part 41 for limiting the rearward displacement of the firing rod 2 and a deformation part 42 for bearing the deformation caused by external force.

[0116] The chambering engagement part 51 acts on the projectile arm structure 4. The component containing the chambering engagement part 51 also has a firing limiting surface 52 for abutting against the front end of the blocking part 41 on the projectile arm structure 4. An annular protrusion 21 is located in the middle of the firing rod 2. The chambering engagement part 51 is located on the rearward side of the annular protrusion 21, and the firing limiting surface 52 is located on the frontward side of the annular protrusion 21. This ingenious design places the chambering engagement part 51 and the firing limiting surface 52 on the same annular protrusion 21. A guide slope 511 is formed on the rearward side of the annular protrusion 21 of the chambering engagement part 51.

[0117] The lancing pen also includes a pusher 6; the pusher 6 is mounted on the front of the housing 1, and the front end of the pusher 6 has a lancing surface 611 for pressing against the patient's skin and bearing pressure; the pusher 6 has a pushing action part 621 facing the rear end and cooperating with the spring arm structure 4.

[0118] In the first embodiment of the present invention, the deformable part 42 of the spring arm structure 4 is arranged to be sleeved on the outside of the upper chamber fitting part 51 and the pushing action part 621 of the pusher 6.

[0119] In the loaded state, the deformable part 42 of the projectile arm structure 4 expands outward radially under the action of the loading engagement part 51, and the blocking part 41 of the projectile arm structure 4 also expands accordingly. After the loading engagement part 51 passes over the deformable part 42, the inner diameter of the deformable part 42 shrinks and recovers, and the blocking part 41 of the projectile arm structure 4 shrinks and abuts against the firing limiting surface 52.

[0120] In the firing state, the deformable part 42 of the projectile arm structure 4 expands outward radially under the action of the pushing action part 621 of the pusher 6, so that the blocking part 41 of the projectile arm structure 4 expands and releases the restriction on the firing limiting surface 52, thereby enabling the firing rod 2 to move forward.

[0121] This design allows the projectile arm structure 4 to be mounted on the inner wall of the housing 1, the loading engagement part 51 to be mounted on the firing rod 2, and the pushing action part 621 of the pusher 6 to be mounted on the inner side of the projectile arm structure 4. This structure works together to load the head into the chamber using the loading engagement part 51 and the projectile arm structure 4, and to trigger the head by using the pusher 6 and the projectile arm structure 4. The design is reasonable and makes more scientific use of the internal space of the housing 1.

[0122] In the first embodiment of the present invention, the spring arm structure 4 on the middle sleeve 12, together with the pusher 6 and the firing rod 2, realizes the loading function of the firing rod 2 and the middle sleeve 12, the firing function of the firing rod 2, and the blood collection function of pressing the pusher 6 and firing the firing rod 2.

[0123] In Example 1, when the gun is loaded, the blood collection needle 9 is inserted into the firing rod 2 through the head. The firing rod 2 moves backward, reaching the two bullet arms of the middle sleeve 12, forcing the two bullet arms to open outward. The firing rod 2 continues to move backward, passing the two bullet arms of the middle sleeve 12. Since the two bullet arms no longer have the force to open outward, they return to their original position. The firing rod 2 continues to move to the stop edge of the middle sleeve 12 and can no longer move. The adjusting handle is released, and the firing limiting surface 52 of the firing rod 2 is locked onto the end face of the blocking part 41 of the two bullet arms of the middle sleeve 12. The loading function is achieved.

[0124] In Example 1, when the pusher 6 is pressed, the pusher 6 moves inward. The middle sleeve 12 adopts a two-arm structure 4. The two support angles 62 of the pusher 6 move forward, forcing the arms of the middle sleeve 12 to open outward. The firing rod 2 and the middle sleeve 12 are engaged by the arms. After the arms open outward, the firing rod 2 disengages from the middle sleeve 12 and the firing rod 2 is launched.

[0125] In the implementation of Example 1, the blood collection pen has an initial state, a loaded state, and a firing state.

[0126] In Example 1, in the initial state, reference Figure 1 As shown, at this time, the pushing action part 621 of the pusher 6 and the upper chamber engagement part 51 of the firing rod 2 are both located on the front end side of the rear end face of the blocking part 41. Figure 2 This is a diagram showing the preparation for inserting the blood collection needle 9.

[0127] In Example 1, the steps are as follows, with the gun loaded:

[0128] refer to Figure 3 , Figure 4 As shown, insert the blood collection needle 9;

[0129] refer to Figure 5 As shown, continue pressing the blood collection needle 9. The blood collection needle 9 drives the firing rod 2 to move backward. The upper chamber fitting part 51 on the firing rod 2 opens the blocking part 41 of the upper bullet arm structure 4 of the middle sleeve 12, causing the deformation part 42 to expand. Then, the upper chamber fitting part 51 on the firing rod 2 passes over the blocking part 41, the deformation part 42 returns to its original state, and the blocking part 41 moves inward to abut. After no external force is applied to the blood collection needle 9, the firing rod 2 moves forward under the drive of the firing spring 3. At this time, the firing limiting surface 52 on the firing rod 2 abuts against the blocking part 41 on the middle sleeve 12, restricting the firing rod 2 from entering the firing state.

[0130] In Example 1, the steps are as follows during the launch phase:

[0131] refer to Figure 6 As shown, first rotate and remove the cap of the blood collection needle 9;

[0132] refer to Figure 7As shown, the blood collection surface 611 of the blood collection pen is placed against the blood collection site on the human skin, and the pusher 6 is pressed. At this time, the pushing action part 621 of the two support corners 62 of the pusher 6 moves backward, forcing the spring arm structure 4 of the middle sleeve 12 to open outward, so that the firing limiting surface 52 on the firing rod 2 is separated from the blocking part 41 on the middle sleeve 12, and the firing rod 2 is released from the restriction of forward firing.

[0133] refer to Figure 8 As shown. Under the action of the launching spring 3, the launching rod 2 is launched towards the front end, at which time the blood collection needle 9 extends forward to the blood collection surface 611 to collect blood.

[0134] Example 2, as Figures 1 to 8 As shown, in Embodiment 1 of the present invention, a lancing pen is proposed, comprising a housing 1, a lancet 2, and a launching spring 3. The housing 1 is the pen shell structure of the lancing pen, and a ejection cavity is provided inside the housing 1. The lancet 2 is a launching component with a head into which a lancing needle 9 can be inserted, and the lancet 2 is located inside the ejection cavity of the housing 1. A loading locking and unlocking structure is provided between the lancet 2 and the housing 1. The launching spring 3 is an elastic component on the lancing pen used to provide ejection force, and the launching spring 3 acts in the ejection direction of the lancet 2.

[0135] The firing rod 2 is provided with a spring arm structure 4, and the middle sleeve 12 is provided with a chamber fitting part 51; the spring arm structure 4 is provided with a blocking part 41 for limiting the rearward displacement of the firing rod 2 and a deformation part 42 for bearing the deformation caused by external force.

[0136] The chambering engagement part 51 acts on the projectile arm structure 4, and the component where the chambering engagement part 51 is located is also provided with a firing limiting surface 52 facing the front end for abutting against the blocking part 41 on the projectile arm structure 4.

[0137] The lancing pen also includes a pusher 6; the pusher 6 is mounted on the front of the housing 1, and the front end of the pusher 6 has a lancing surface 611 for pressing against the patient's skin and bearing pressure; the pusher 6 has a pushing action part 621 facing the rear end and cooperating with the spring arm structure 4.

[0138] In the second embodiment of the present invention, the deformable part 42 of the spring arm structure 4 is arranged to be sleeved inside the upper chamber fitting part 51 and the pushing action part 621 of the pusher 6.

[0139] In Embodiment 2, in the loaded state, the deformable part 42 of the projectile arm structure 4 shrinks radially inward under the action of the loaded engagement part 51, and the blocking part 41 of the projectile arm structure 4 also shrinks accordingly. After the blocking part 41 at the rear end of the projectile arm structure 4 passes over the loaded engagement part 51 of the housing 1, the inner diameter of the deformable part 42 increases and recovers. Then, the blocking part 41 of the projectile arm structure 4 expands and abuts against the firing limiting surface 52.

[0140] In the second embodiment, in the firing state, the deformable part 42 of the projectile arm structure 4 shrinks inward and radially under the action of the pushing action part 621 of the pusher 6, so that the blocking part 41 of the projectile arm structure 4 shrinks and releases the restriction on the firing limiting surface 52, thereby enabling the firing rod 2 to move forward.

[0141] In Embodiment 2, this design allows the projectile arm structure 4 to be mounted on the firing rod 2, the loading engagement part 51 to be mounted on the inner wall of the housing 1, and the pushing action part 621 of the pusher 6 to be mounted on the outer side of the projectile arm structure 4. This also enables the loading of the head using the engagement part 51 and the projectile arm structure 4, and the triggering of the head using the engagement part 6 and the projectile arm structure 4. The structure is compact and the engagement process is smooth.

[0142] In the second embodiment of the present invention, the spring arm structure 4 on the middle sleeve 12, together with the pusher 6 and the firing rod 2, realizes the loading function of the firing rod 2 and the middle sleeve 12, the firing function of the firing rod 2, and the blood collection function of pressing the pusher 6 and firing the firing rod 2.

[0143] In Example 2, when the head is loaded, the two projectile arm structures 4 of the firing rod 2 are in a compressed state. The blood collection needle 9 is inserted into the firing rod 2 from the head. The firing rod 2 moves backward. After the two projectile arms of the firing rod 2 disengage from the blocking part 41, the two projectile arms open outward. The blocking part 41 on the firing rod 2 expands and abuts against the firing limiting surface 52 to realize the loading function.

[0144] In Example 2, when the pusher 6 is pressed, the pusher 6 moves inward and the two support angles 62 of the pusher 6 move forward, forcing the middle sleeve 12 spring arm to retract inward. The blocking part 41 of the firing rod 2 disengages from the firing limiting surface 52 of the middle sleeve 12, and the firing rod 2 is fired.

[0145] In the implementation of Example 2, the blood collection pen has an initial state, a loaded state, and a firing state.

[0146] In Example 2, in the initial state, the initial position of the upper arm structure 4 on the firing rod 2 is referenced. Figure 17 As shown.

[0147] In Example 2, with the gun loaded, the following steps are followed:

[0148] refer to Figure 18As shown, the pusher 6 is in the initial position. The blood collection needle 9 is inserted. Pressing the blood collection needle 9 further causes the firing rod 2 to move backward. The spring arm structure 4 on the firing rod 2 moves backward synchronously. The blocking part 41 at the rear end of the spring arm structure 4 passes over the upper chamber fitting part 51 of the housing 1, causing the deformation part 42 to expand. Then the upper chamber fitting part 51 on the housing 1 passes over the blocking part 41, the deformation part 42 returns to its original state, and the blocking part 41 moves outward to abut. After no external force is applied to the blood collection needle 9, the firing rod 2 moves forward under the action of the firing spring 3. At this time, the blocking part 41 on the firing rod 2 abuts against the firing limiting surface 52 on the middle sleeve 12, restricting the firing rod 2 from entering the firing state.

[0149] In Example 2, the steps are as follows during the launch phase:

[0150] refer to Figure 19 As shown, first rotate and remove the cap of the blood collection needle 9, place the blood collection surface 611 of the blood collection pen against the blood collection site on the human skin, and press the pusher 6. At this time, the pushing action part 621 of the two support corners 62 of the pusher 6 moves backward, forcing the spring arm structure 4 of the shooting rod 2 to expand and shrink inward, so that the blocking part 41 on the shooting rod 2 is separated from the firing limiting surface 52 on the middle sleeve 12, and the shooting rod 2 is released from the restriction of forward firing.

[0151] refer to Figure 20 As shown. Under the action of the launching spring 3, the launching rod 2 is launched towards the front end, at which time the blood collection needle 9 extends forward to the blood collection surface 611 to collect blood.

[0152] In Embodiment 3, the rest is the same as in Embodiment 1 or Embodiment 2, except that a viewing window 81 is provided at the pen cap 8 at the front end of the lancing pen (see...). Figure 29 ).

[0153] In the third embodiment of the present invention, the pen cap 8 is detachably and fixedly connected to the front of the housing 1. The pen cap 8 is sleeved on the outside of the pusher 6. The pen cap 8 has a through hole for the pusher 6 to extend toward the front end. The pen cap 8 is designed to give the blood collection pen more functions and facilitate the assembly and use of other components. After the firing is completed, the pen cap 8 can be removed directly without removing the needle.

[0154] In the third embodiment of the present invention, the front end of the hair pusher 6 has a radially deformable pressing part 61, so that the hair pusher 6 can be assembled into the through hole of the pen cap 8 when the pressing part 61 is radially contracted. The blood collection surface 611 is located at the front end of the pressing part 61. This design allows the hair pusher 6 to be better assembled with the pen cap 8.

[0155] In the third embodiment of the present invention, the rearward surface of the pressing part 61 is provided with a push-limiting surface 612 for acting on the front end of the pen cap 8, so as to limit the stroke of the pusher 6 after it is pressed and prevent the pusher 6 from falling out by the pen cap 8.

[0156] In the third embodiment of the present invention, the window 81 is set to correspond to the movement path of the blood collection needle 9 on the gun rod 2. The position of the window 81 distinguishes between loaded and unloaded needles, which can remind the user to be careful of needle firing and avoid accidental injury.

[0157] In Embodiment 3 of the present invention, the viewing window 81 is located at two positions around the pen cap 8, so that the user does not need to rotate the lancing pen all the way to see the viewing window 81. Preferably, the viewing windows 81 are symmetrically arranged on both sides of the pen cap 8, with a reasonable and easy-to-observe position. The pen cap 8 is made of transparent material at least at the position of the viewing window 81, making the viewing window 81 easier and clearer to observe. Preferably, the entire pen cap 8 is made of transparent plastic, reducing the difficulty of the manufacturing process. The pen cap 8 at least partially overlaps the hair pusher 6 in the circumferential direction, the viewing window 81 is opened at the overlapping part, and a notch is provided on the hair pusher 6 at the position corresponding to the viewing window 81.

[0158] In Embodiment 3 of the present invention, the position of the window 81 is configured to have at least the following:

[0159] In the initial state, such as Figure 21 , Figure 22 As shown, the lancet 9 is not installed in the firing rod 2, and the projection position of the viewing window 81 is directly opposite the position of the firing rod 2. Before use, the color of the firing rod 2 (e.g., white) can be seen in the viewing window 81 of the pen cap 8, indicating that the pen is not loaded. There may or may not be a needle inside; the firing rod 2 will not fire, thus avoiding accidental injury.

[0160] In the loaded state, such as Figure 23 , Figure 24 As shown, the blood collection needle 9 is not inserted into the injection rod 2, and the pen cap 8 window 81 shows a hollowed-out view.

[0161] In the loaded state, such as Figure 25 , Figure 26As shown, the lancet 9 is inserted into the firing rod 2 and pressed backward to chamber a shot. The projection position of the viewing window 81 is directly opposite the position of the lancet 9. With the lancet chambered, the firing rod 2 moves backward and retracts into the inner sleeve 12. The lancet 9 is visible in the viewing window 81, and its color is visible. The firing rod 2 fires, allowing blood to be collected. This serves as a warning to the user to be careful of needle injury, preventing accidental injury. If the lancet 9 is not present and is chambered using other methods, such as pulling the tail lever, the firing rod 2 moves backward and retracts into the inner sleeve 12. The white firing rod 2 is not visible in the viewing window 81, and the area of ​​the viewing window 81 is empty, revealing only black parts. The firing rod 2 fires, but because there is no needle, accidental injury is avoided.

[0162] In launch state, such as Figure 27 , Figure 28 As shown, the shooting rod 2 is launched forward after the restriction on its forward movement is lifted. The projection position of the window 81 is directly opposite the position of the shooting rod 2. After use, the color of the shooting rod 2 can be seen. The front end of the shooting rod 2 is also equipped with a blood collection needle 9, which can remind the user to avoid injury.

[0163] In Embodiment Four, the remainder is the same as in Embodiment One, Embodiment Two, or Embodiment Three, except that a spring arm 22 is also provided on the side of the middle section of the firing rod 2 (see...). Figure 10 The inner wall of the middle sleeve 12 is provided with a sliding support surface 122 that cooperates with the spring arm 22 (see...). Figure 12 The spring arm 22 is an elastic suspension arm, and its end has a bent or arc-shaped segment 221. The back of the bent or arc-shaped segment 221 slides in contact with the sliding support surface 122. The sliding support surface 122 is parallel to the firing direction of the firing rod 2. When the firing rod 2 is firing, the spring arm 22 contacts and slides with the sliding support surface 122 to form an offset guide to ensure the straightness of the shot, avoid the shaking of the firing rod during piercing, thereby improving the piercing effect and reducing pain.

[0164] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A lancing pen, comprising a housing, a firing rod, and a firing spring, wherein the housing is the pen shell structure of the lancing pen, and a firing cavity is provided inside the housing; the firing rod is a firing component with a head into which a lancing needle can be inserted, and the firing rod is located inside the firing cavity of the housing; a locking and unlocking structure is provided between the firing rod and the housing; the firing spring is an elastic component on the lancing pen used to provide firing force, and the firing spring acts in the firing direction of the firing rod; Its features are: The casing and the firing rod are provided with a projectile arm structure on one side and a loading engagement part on the other side; the projectile arm structure is provided with a blocking part for limiting the rearward displacement of the firing rod and a deformation part for bearing the deformation caused by external force; The upper chamber fitting part acts on the projectile arm structure, and the component where the upper chamber fitting part is located is also provided with a firing limiting surface facing the front end for abutting against the blocking part on the projectile arm structure; The lancing pen also includes a pusher; the pusher is mounted on the front of the housing, and the front end of the pusher has a lancing surface for pressing against the patient's skin and bearing pressure; the pusher has a pushing action part facing the rear end and cooperating with the spring arm structure. The lancing device is configured to have a loaded and firing state; In the loaded state, the gun rod is inserted into the blood collection needle from the head and a force is applied toward the rear end. When the gun rod moves backward, the loading engagement part forces the deformable part of the projectile arm structure to deform radially until the loading engagement part passes the blocking part of the projectile arm structure. At this time, the deformation of the deformable part is restored. At this time, the firing limiting surface and the blocking part on the projectile arm structure limit the forward movement of the gun rod, and the needle tip of the blood collection needle is located at the rear end of the blood collection surface on the pusher. In the firing state, the blood collection surface of the pusher is pressed onto the human skin, applying a pressing force towards the rear end and driving the pusher to move backward. The pushing action part of the pusher releases the deformation part of the spring arm structure and undergoes radial deformation until the blocking part on the spring arm structure releases the restriction on the forward movement of the firing limiting surface. The firing spring drives the firing rod forward and causes the needle tip of the blood collection needle to pass through the blood collection surface and pierce the human skin. or: In the loaded state, the gun rod is inserted into the blood collection needle from the head and a force is applied toward the rear end. When the gun rod moves backward, the deformation part of the loading engagement part of the bullet arm structure undergoes radial deformation until the loading engagement part passes the blocking part of the bullet arm structure. At this time, the deformation of the deformation part is restored. The firing limiting surface and the blocking part on the bullet arm structure limit the forward movement of the gun rod, and the needle tip of the blood collection needle is located at the rear end of the blood collection surface on the pusher. In the firing state, the blood collection surface of the pusher is pressed against the human skin, applying pressure towards the rear end and causing the pusher to move backward. The pushing action of the pusher forces the deformation part of the spring arm structure to deform radially until the blocking part on the spring arm structure releases the restriction on the forward movement of the firing limiting surface. The firing spring drives the firing rod forward and causes the needle tip of the blood collection needle to pass through the blood collection surface and pierce the human skin.

2. The blood collection pen according to claim 1, characterized in that: The spring arm structure is either integrally formed with the shell or separately formed.

3. A blood collection pen according to claim 1, characterized in that: The deformable part of the spring arm structure is arranged to be sleeved on the outside of the upper chamber fitting part and the pushing action part of the pusher; In the loaded state, the deformable part of the projectile arm structure expands outward radially under the action of the loading mating part, and the blocking part of the projectile arm structure also expands accordingly. After the loading mating part passes the deformable part, the inner diameter of the deformable part shrinks and recovers, and the blocking part of the projectile arm structure shrinks and abuts against the firing limiting surface. In the firing state, the deformable part of the projectile arm structure expands radially outward under the action of the pusher, thereby expanding the blocking part of the projectile arm structure and releasing the restriction on the firing limiting surface, thus enabling the firing rod to move forward.

4. A blood collection pen according to claim 1, characterized in that: The deformable part of the spring arm structure is arranged to be sleeved inside the upper chamber fitting part and the pushing action part of the pusher; In the loaded state, the deformable part of the projectile arm structure shrinks radially inward under the action of the loaded engagement part, and the blocking part of the projectile arm structure also shrinks accordingly. After the blocking part at the rear end of the projectile arm structure passes over the loaded engagement part of the housing, the inner diameter of the deformable part increases and recovers. Then, the blocking part of the projectile arm structure expands and abuts against the firing limiting surface. In the firing state, the deformable part of the projectile arm structure shrinks radially inward under the action of the pusher, which causes the blocking part of the projectile arm structure to shrink and release the restriction on the firing limiting surface, thereby enabling the firing rod to move forward.

5. A blood collection pen according to claim 1, characterized in that: The blood collection pen also has an initial state; taking the rear end face of the blocking part in the bullet arm structure as a reference, in the initial state, the pushing part and the loading engagement part of the pusher are both located on the front end side of the rear end face; in the loading state, the pushing part of the pusher is located on the front end side of the rear end face, and the loading engagement part and the limiting surface are located on the rear end side of the rear end face after passing the blocking part; in the firing state, the pushing part of the pusher is located on the front end side of the rear end face, and the loading engagement part and the firing limiting surface of the firing rod are located on the front end side of the rear end face after passing the blocking part.

6. A blood collection pen according to claim 1, characterized in that: When the firing rod is loaded, the limiting surface on the firing rod abuts against the blocking part on the projectile arm structure. The distance between the needle tip of the blood collection needle and the blood collection surface is greater than the stroke of the blood collection surface of the pusher when it is fired.

7. A blood collection pen according to claim 1, characterized in that: The blood collection pen also includes a push-release spring, one end of which acts on the housing and the other end on the pusher. The pusher has a reset surface for resisting the push-release spring, and the push-release spring is a structure for providing the pusher with a tendency to move towards the front end.

8. A blood collection pen according to claim 7, characterized in that: The two spring arm structures are symmetrically arranged on the periphery of the housing, and each spring arm structure has a push-limiting surface at the front end position that abuts against the push-reset spring.

9. A blood collection pen according to claim 1, characterized in that: The housing consists of an outer shell and a middle sleeve. The middle sleeve has a cylindrical structure and is fixedly connected to the inside of the outer shell. The spring arm structure is located on the middle sleeve.

10. A blood collection pen according to claim 9, characterized in that: A guide block is provided on the periphery of the pusher, and a guide groove is provided on the middle sleeve accordingly. The guide block and the guide groove are slidably engaged.

11. A blood collection pen according to claim 10, characterized in that: The pusher includes two support corners located at the rear section, and the pushing action part is located at the rear end of the support corners.

12. A blood collection pen according to claim 1, characterized in that: The middle part of the firing rod has an annular protrusion, the upper chamber fitting part is located on the rear side of the annular protrusion, and the firing limiting surface is located on the front side of the annular protrusion.

13. A blood collection pen according to claim 12, characterized in that: The upper chamber fitting part has a guide slope on the rearward side of the annular protrusion.

14. A blood collection pen according to claim 1, characterized in that: The blood collection pen also includes a pen cap, which is detachably and fixedly connected to the front of the housing. The pen cap is fitted on the outside of the hair clipper, and the pen cap has a through hole for the hair clipper to extend toward the front end.

15. A blood collection pen according to claim 14, characterized in that: The front end of the pusher has a radially deformable pressing part, so that the pusher can be fitted into the through hole of the pen cap when the pressing part is radially contracted, and the blood collection surface is located at the front end of the pressing part.

16. A blood collection pen according to claim 15, characterized in that: The rearward surface of the pressing part is provided with a push-limiting surface for acting on the front end of the pen cap, so as to limit the stroke of the pusher when it is pressed.

17. A blood collection pen according to claim 14, characterized in that: The pen cap is provided with a viewing window, which is set to correspond to the movement path of the blood collection needle on the injection rod.

18. A blood collection pen according to claim 17, characterized in that: The position of the window is configured to have at least the following: In the initial state, the blood collection needle is not installed in the injection rod, and the projection position of the window is directly opposite the position of the injection rod; With the gun loaded, the blood collection needle is inserted into the gun rod and pressed back to load the gun, and the projection position of the viewing window is directly opposite the position of the blood collection needle; In the firing state, the firing rod is released from the forward movement restriction and fired forward, and the projection position of the window is directly opposite the position of the firing rod.

19. A blood collection pen according to claim 17, characterized in that: The viewing window is located at two positions around the pen cap.

20. A blood collection pen according to claim 17, characterized in that: The pen cap is made of a transparent material at least at the location of the viewing window.

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