Blood sampling pen with detachable needle

Abstract

The utility model discloses a blood sampling pen with a detachable needle, which comprises a shell, an ejection rod, a needle detaching rod and a pen cap, and the needle detaching rod is parallel to an ejection rod body in an ejection cavity. The front end blocking face is located at the front end, acts on the opening portion of the pen cap and is used for preventing the needle from being detached, the needle detaching acting face acts on the tail portion of the blood taking needle, and the pressing limiting portion acts on the injection rod. According to the blood sampling pen, the needle dismounting rod is optimized and improved, the front end blocking face of the needle dismounting rod is limited through the opening portion of the pen cap, so that the blood sampling pen cannot carry out needle dismounting operation when the pen cap is installed, the needle dismounting operation can only be carried out when the pen cap is dismounted, inconvenience caused by misoperation in the past is avoided, and the safety of the blood sampling pen is improved. And the use reliability and the operation performance of the blood sampling pen are improved.

Description

Technical Field

[0001] This utility model relates to the field of blood collection equipment technology, specifically to a blood collection pen with a removable needle for peripheral blood collection. Background Technology

[0002] 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.

[0003] Chinese patent CN108836357B has been granted an invention patent with patent number 201520742270.X, entitled "A retractable needle lancing pen and its assembly method". This patent solves the problem of inconvenience caused by using a side-retractable needle, making beneficial improvements in ease of use and achieving positive results. The patent concept is to design a firing and retracting needle structure that includes a guide sleeve, an inner core, a needle retraction button, a needle retraction inner core, elastic elements, and a button. The elastic elements include a firing spring, a return spring one, and a return spring two sleeved on the inner core arm. This patent prevents the needle retraction function of the needle retraction button from working after the blood collection needle is loaded, thus preventing accidental needle retraction. However, this patent requires the use of the guide sleeve, the needle retraction button, and the needle retraction inner core when retracting the needle. The needle retraction button interacts with the guide sleeve to radially retract and deform the protruding rib of the needle retraction button, thereby pushing the needle retraction inner core out of the blood collection needle. These components work together and are indispensable. The needle retraction structure is complex, the overall structure is relatively complex, the manufacturing process is difficult, the assembly time is relatively long, there are many parts, and the manufacturing cost is high.

[0004] In view of this, how to solve the problems of complex overall structure, high production difficulty and high cost of the needle removal structure in the existing blood collection pen needle has become the research topic to be solved by this utility model. Utility Model Content

[0005] The purpose of this invention is to provide a blood collection pen with a removable needle.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model proposes a detachable needle lancing pen, comprising a shell, a lancet, a needle removal lever, and a pen cap, wherein:

[0007] The housing is the structure of a lancing pen, with an ejection chamber inside. The firing rod is a launching component with a head capable of holding a lancing needle, located within the ejection chamber of the housing. A locking and unlocking mechanism is provided between the firing rod and the housing. The needle removal rod is a needle removal component on the lancing pen used to push out the lancing needle; the needle removal rod extends into the ejection chamber of the housing and acts in the direction of pushing out the lancing needle. The pen cap is detachably and fixedly connected to the front of the housing. Its innovation lies in:

[0008] The needle removal rod is arranged side by side with the ejector rod body in the ejection cavity. The needle removal rod is provided with a front end stop surface for preventing needle removal located at the front end and acting on the pen cap opening, a needle removal action surface acting on the tail end of the blood collection needle, and a pressing limit part acting on the ejector rod.

[0009] The ejector rod is provided with a pressing limit surface for pressing the needle removal rod to the bottom; the middle part of the ejector rod is provided with a sliding space for the needle removal rod to slide.

[0010] In the needle removal state, the pen cap is released from its contact with the front end of the needle removal rod. The needle removal rod is pressed from the tail end until the needle removal action surface on the needle removal rod abuts against the tail end of the blood collection needle. When the pressing limit part of the needle removal rod is restricted by the pressing limit surface on the injection rod, the blood collection needle is completely pushed out by the needle removal rod.

[0011] The relevant contents of this utility model are explained as follows:

[0012] 1. In the above-mentioned technical solution of this utility model, addressing the problems of complex overall structure, high manufacturing difficulty, and high cost of the needle removal structure in existing blood collection pens, this utility model's blood collection pen mainly focuses on how to protect the needle removal rod and prevent accidental needle removal when not in use while simplifying the structure. The protection of the needle removal rod is achieved through the coordinated use of the housing, the ejector rod, and the pen cap. The needle removal rod is located within the ejection cavity of the housing and is assembled in the sliding space of the ejector rod body. During needle removal and in the reset process after removal, it is ensured that the needle removal rod only slides within the sliding space, making its operation more stable and reliable, preventing interference and breakage, and ensuring accurate needle removal during the removal process. A [further details are needed for accurate needle removal]. The engagement between the pen cap and the needle removal lever allows the pen cap, located at the front of the housing, to abut against the front end of the needle removal lever before needle removal. This prevents the needle removal lever from accidentally dislodging from the needle holder before the pen cap is removed, thus ensuring safer and more reliable use and removal of the lancing needle during lancing pen operation. Compared to conventional lancing pens with an automatic needle removal lever, this design uses fewer components—two fewer than conventional lancing pens with fewer components. It fully utilizes the spatial and structural linkages between the needle removal lever, the tail handle, the needle removal lever, the injection rod, and the pen cap, optimizing the structure and ensuring reliable and stable functionality. This significantly reduces manufacturing costs, reduces assembly steps and time, simplifies manufacturing, and greatly contributes to increasing product competitiveness.

[0013] 2. In the above technical solution, the tail of the housing is fitted with a tail handle, and the tail handle has a guide post facing the front end.

[0014] 3. In the above technical solution, the needle unloading rod is provided with a rear end stop on the guide post located at the rear end and acting on the tail lever. The part of the rear end stop can slide in the sliding space. In the needle unloading state, after pressing the tail lever from the rear, the guide post of the tail lever acts on the rear end stop on the needle unloading rod to cause the needle unloading rod to move towards the head. This achieves the goal of restricting the movement of the needle unloading rod towards the rear in the loading state, and then using the needle unloading rod to limit the loading of the firing rod. The combination is ingenious and reasonable. The needle unloading operation is performed by pressing the tail lever, which is more convenient than the side needle unloading method.

[0015] 4. In the above technical solution, the length extension direction of the guide post on the tail pull handle is located at the axial center of the housing, and the corresponding rear end stop on the needle removal rod is located at the axial center of the housing and perpendicular to the axial center of the housing. This improves the tactile feel of pressing the tail pull handle from the tail end and having the guide post on the tail pull handle act on the rear end stop on the needle removal rod during needle removal. The force applied by the fingers in the center is more even, making the force application during needle removal more user-friendly and avoiding the jamming sensation caused by uneven force distribution.

[0016] 5. In the above technical solution, the rear end stop of the needle unloading rod is provided with a column for wrapping the guide post. The column extends towards the tail and a guide slope is provided on the inner side of the tail. This structure facilitates the positioning and cooperation between the guide post of the tail handle and the rear end stop of the needle unloading rod, and also facilitates assembly and positioning.

[0017] 6. In the above technical solution, in the needle removal state, after the guide post of the tail handle acts on the rear end stop of the needle removal rod, it drives the injection rod and the needle removal rod to move towards the head by a certain distance. Then, the injection rod is restricted from moving towards the head by the housing, and the tail handle continues to drive the needle removal rod to move towards the head.

[0018] 7. In the above technical solution, a launching spring is fitted onto the firing rod, and the firing rod is provided with a launching limiting surface for abutting and compressing the head of the launching spring; the needle unloading rod is provided with a reset limiting surface for abutting and compressing the tail of the launching spring; the part where the reset limiting surface is located can slide in the sliding space; in the loaded state, the firing rod is locked after being chambered towards the tail, at which time the tail of the launching spring is restricted by the reset limiting surface of the needle unloading rod, and the launching spring is compressed from the head to the tail. This fully utilizes the multiple linkages between the needle unloading rod, the firing rod, and the launching spring located in the same ejection cavity to achieve the simultaneous realization of the firing rod piercing driving force and the needle unloading rod reset driving force using a single launching spring.

[0019] 8. In the above technical solution, the needle ejector rod is provided with a tail abutment at its tail end for positioning and abutting against the housing to restrict the needle ejector rod from moving towards the tail end. Corresponding to the tail abutment, a needle ejector limiting part is provided on the housing. In the loaded state, the tail abutment of the needle ejector rod abuts against the needle ejector limiting part of the housing to restrict the needle ejector rod from moving towards the tail end. At this time, the tail end of the firing spring is restricted by the reset limiting surface of the needle ejector rod, thereby causing the firing spring to compress from the head to the tail end. This structure achieves the abutment and positioning of the needle ejector rod by the housing and the firing rod by the needle ejector rod in the loaded state, making the compression process of the firing spring from the head to the tail end more reliable and stable. By utilizing the spatial linkage between the housing and the needle ejector rod, and the spatial linkage between the firing rod and the needle ejector rod, the structure becomes more compact and stable.

[0020] 9. In the above technical solution, the displacement path of the front end stop on the needle removal rod is parallel to the central axis of the housing. This ensures that the direction of compression of the firing spring from head to tail in the loaded state and from tail to head in the needle removal state is also parallel to the central axis of the housing, making it more convenient to use and improving the practical operation performance of the lancing pen.

[0021] 10. In the above technical solution, the middle part of the injection rod is further provided with a sliding track for the needle unloading rod to slide, and the part of the needle unloading rod where the needle unloading action surface is located slides in the sliding track; the part of the needle unloading rod where the pressing and limiting part is located slides in the sliding space. This utilizes the spatial linkage between the injection rod and the needle unloading rod, making the overall mechanism more compact and easier to assemble.

[0022] 11. In the above technical solution, the firing limiting surface and the pressing limiting surface on the firing rod are located between the sliding space and the sliding track on the firing rod, and the position of the firing limiting surface is closer to the head than the position of the pressing limiting surface. This allows for better linkage and cooperation with the firing spring and the needle unloading rod, ensuring that the firing spring can tightly abut against the firing limiting surface when compressed from the head to the tail during loading, ensuring that the piercing driving force of the firing rod is accumulated. In the needle unloading state, the needle unloading rod can be reliably positioned even when pressed to the bottom, avoiding excessive travel of the needle unloading rod and resulting in a more reasonable arrangement.

[0023] 12. In the above technical solution, the needle ejector rod is L-shaped, comprising a first section and a second section that are perpendicular to each other. The length of the first section extends parallel to the central axis of the housing, and the second section is located at the axial center of the housing and perpendicular to the central axis of the housing. This shape of the needle ejector rod allows for better cooperation with the ejector rod, housing, and ejection spring, and also makes reasonable use of space, avoiding an excessively large overall size.

[0024] 13. In the above technical solution, the front end stop and the needle removal action surface on the needle removal rod are located on the first section, with the front end stop located on the outward side of the first section and the needle removal action surface located on the inward side of the first section. This better ensures that the needle removal rod is firmly positioned when the pen cap is attached, and that the needle removal action surface on the first section acts on the blood collection needle located in the injection rod during unloading. The pressing limit part, the reset limit surface, and the rear end stop are located on the second section, with the pressing limit part and the reset limit surface located on the head-facing side of the second section and the rear end stop located on the tail-facing side of the second section. This better ensures that the injection rod is limited in the loaded state, and that the injection spring is pushed by the guide post of the tail lever in the needle removal state to limit and compress the injection spring. The design is reasonable.

[0025] 14. In the above technical solution, the housing is composed of an outer shell and a middle sleeve. The middle sleeve is mainly cylindrical and is fixedly connected to the inside of the outer shell. The pen cap is detachably and fixedly connected to the front of the outer shell, and the tail pull sleeve is attached to the inner wall of the tail of the outer shell.

[0026] 15. In the above technical solution, the needle ejector rod is provided with a tail abutment at its tail end for positioning and abutting against the middle sleeve to restrict the needle ejector rod from moving towards the tail end. Corresponding to the tail abutment, a needle ejector limiting part is provided on the middle sleeve. In the loaded state, the tail abutment of the needle ejector rod abuts against the needle ejector limiting part of the housing to restrict the needle ejector rod from moving towards the tail end. At this time, the tail end of the firing spring is restricted by the reset limiting surface of the needle ejector rod, thereby causing the firing spring to compress from the head to the tail end. This structure achieves the abutment and positioning effect of the housing against the needle ejector rod and the needle ejector rod against the firing rod in the loaded state, making the compression process of the firing spring from the head to the tail end more reliable and stable.

[0027] 16. In the above technical solution, the front end of the middle sleeve is provided with a notch for sliding at the location of the front end stop of the needle removal rod. This utilizes the spatial linkage between the housing and the needle removal rod to make the structure more compact and stable.

[0028] 17. In this utility model, the meaning of "forward" in "forward", "front end", etc., is the direction pointed to by the needle tip of the needle core or the firing direction of the needle core, which is the direction of blood collection. The meaning of "rear end" in "rear part", "rear section", etc., is the opposite direction pointed to by the tail of the shell or the firing direction of the needle core.

[0029] Due to the application of the above solution, this utility model has the following advantages and effects compared with the prior art:

[0030] 1. This utility model optimizes and improves the needle removal rod by limiting the front end of the needle removal rod through the pen cap opening, so that the needle removal operation cannot be performed when the pen cap is installed. The needle can only be removed when the pen cap is removed, which avoids the inconvenience caused by previous misoperation and improves the reliability and operation performance of the lancing pen.

[0031] 2. The present invention features a clever and reasonable structural design that fully utilizes the multiple linkages between the needle removal rod, the firing rod, and the launching spring located within the same ejection cavity to achieve the simultaneous use of a single launching spring to drive both the puncture force of the firing rod and the reset force of the needle removal rod. Compared to conventional blood collection pens with a needle removal rod that automatically resets, this design uses fewer components, ensures reliable and stable functionality, significantly reduces manufacturing costs, and simplifies assembly processes and time, thereby enhancing product competitiveness. Attached Figure Description

[0032] Figure 1 This is an explosion diagram of the blood collection pen in an embodiment of this utility model;

[0033] Figure 2 This is a three-dimensional schematic diagram of the assembly of the firing rod, firing spring, and needle unloading rod in an embodiment of this utility model;

[0034] Figure 3 This is a front view of the assembly of the firing rod, firing spring, and needle unloading rod in an embodiment of this utility model;

[0035] Figure 4 This is a top view of the assembly of the firing rod, firing spring, and needle unloading rod in an embodiment of this utility model;

[0036] Figure 5 This is a schematic diagram of the blood collection pen in its initial state according to an embodiment of the present invention;

[0037] Figure 6 This is a cross-sectional schematic diagram of the blood collection pen in its initial state according to an embodiment of the present invention;

[0038] Figure 7 for Figure 6 Enlarged schematic diagram of Part I;

[0039] Figure 8 for Figure 6 Enlarged schematic diagram of Part II;

[0040] Figure 9 for Figure 6 Enlarged schematic diagram of Part III;

[0041] Figure 10 This is a three-dimensional schematic diagram of the needle removal rod in an embodiment of the present utility model (view 1);

[0042] Figure 11 This is a three-dimensional schematic diagram (view 2) of the needle removal rod in an embodiment of this utility model.

[0043] Figure 12 This is a front view of the needle removal rod in an embodiment of this utility model;

[0044] Figure 13 This is a three-dimensional schematic diagram of the firing rod in an embodiment of the present utility model;

[0045] Figure 14 This is a top view of the firing rod in an embodiment of this utility model;

[0046] Figure 15 This is a bottom view of the firing rod in an embodiment of this utility model;

[0047] Figure 16 This is a schematic diagram of the blood collection pen in the loaded state according to an embodiment of the present invention;

[0048] Figure 17 This is a cross-sectional schematic diagram of the blood collection pen in the loaded state according to an embodiment of the present invention;

[0049] Figure 18 This is a schematic diagram of the blood collection pen in the puncture state according to an embodiment of the present invention;

[0050] Figure 19 This is a cross-sectional schematic diagram of the blood collection pen in the puncture state according to an embodiment of the present invention;

[0051] Figure 20 This is a schematic diagram of the blood collection pen in the needle-removed state according to an embodiment of the present invention;

[0052] Figure 21 This is a cross-sectional schematic diagram of the blood collection pen in the needle-removed state according to an embodiment of the present invention;

[0053] Figure 22 This is a cross-sectional view of the blood collection pen according to an embodiment of the present invention after the needle has been removed.

[0054] The parts shown in the above attached diagram are illustrated below:

[0055] 1. Shell;

[0056] 11. Outer shell; 12. Middle sleeve; 121. Needle removal limiting part; 122. Notch;

[0057] 2. Shooting rod;

[0058] 21. Launch limiting surface; 22. Press limiting surface; 23. Spring; 24. Sliding space; 25. Sliding track;

[0059] 3. Launching spring;

[0060] 4. Needle removal bar;

[0061] 401. First paragraph; 402. Second paragraph;

[0062] 41. Front end stop; 42. Needle removal working surface; 43. Pressing limit part; 44. Reset limit surface; 45. Rear end stop; 46. Tail end abutment part;

[0063] 47. Column; 471. Guide ramp;

[0064] 5. Pen cap;

[0065] 6. Tail handle; 61. Guide post;

[0066] 7. Launch button;

[0067] 8. Blood collection needle. Detailed Implementation

[0068] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0074] 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.

[0075] 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.

[0076] See Figures 1 to 22 As shown, this utility model embodiment proposes a detachable needle lancing pen, which includes a housing 1, a lancing rod 2, a needle removal rod 4, and a pen cap 5, wherein:

[0077] The housing 1 is the pen casing structure of the lancing pen, and a ejection cavity is provided inside the housing 1; the firing rod 2 is a firing component with a head capable of inserting a lancing needle 8, and the firing rod 2 is located inside the ejection cavity of the housing 1; a loading locking and unlocking structure is provided between the firing rod 2 and the housing 1; the needle removal rod 4 is a needle removal component on the lancing pen used to push off the lancing needle 8, and the needle removal rod 4 extends into the ejection cavity of the housing 1 and acts in the direction of pushing off the lancing needle 8; the pen cap 5 is detachably and fixedly connected to the front of the housing 1; its innovation lies in:

[0078] The needle removal rod 4 is arranged side by side with the rod body of the ejection rod 2 in the ejection cavity. The needle removal rod 4 is provided with a front end stop surface 41 located at the front end and acting on the mouth of the pen cap 5 for preventing needle removal, a needle removal action surface 42 acting on the tail of the blood collection needle 8, and a pressing limit part 43 acting on the ejection rod 2.

[0079] The ejector rod 2 is provided with a pressing limiting surface 22 for pressing the needle removal rod 4 to the bottom; the middle part of the ejector rod 2 is provided with a sliding space 24 for the needle removal rod 4 to slide.

[0080] In the needle removal state, the pen cap 5 releases its abutment to the front end stop 41 of the needle removal rod 4, and presses the needle removal rod 4 from the tail end until the needle removal action surface 42 on the needle removal rod 4 abuts against the tail end of the blood collection needle 8. When the pressing limit part 43 of the needle removal rod 4 is restricted by the pressing limit surface 22 on the injection rod 2, the blood collection needle 8 is completely pushed out by the needle removal rod 4.

[0081] Through the implementation of the above embodiments of this utility model, the protection of the needle removal rod is achieved by the cooperation of the housing, the ejector rod, and the pen cap. The needle removal rod is set in the ejection cavity of the housing and is assembled in the sliding space of the ejector rod body. During the needle removal process and during the reset process after needle removal, it can be ensured that the needle removal rod will only slide within the sliding space. The operation of the needle removal rod is more stable and reliable, and it will not be interfered with or damaged. It can also ensure accurate needle removal during the needle removal process. The pen cap and the needle removal rod are designed to cooperate so that before needle removal, the pen cap installed at the front of the housing can abut against the front end stop 41 of the needle removal rod 4. This prevents the needle removal rod from being accidentally touched and dislodged from the needle seat when the pen cap is not removed. This makes the use and removal of the blood collection needle during the use of the blood collection pen safer and more reliable.

[0082] In another embodiment of this utility model, a tail handle 6 is sleeved at the tail end of the housing 1, and the tail handle 6 has a guide post 61 facing the front end. Specifically, the needle unloading rod 4 is provided with a rear end stop 45 located at the rear end and acting on the guide post 61 of the tail handle 6. The part of the rear end stop 45 can slide in the sliding space 24. In the needle unloading state, after pressing the tail handle 6 from the tail end, the guide post 61 of the tail handle 6 acts on the rear end stop 45 on the needle unloading rod 4 to move the needle unloading rod 4 towards the head. This achieves the goal of restricting the movement of the needle unloading rod towards the tail end in the loading state, and then limiting the loading of the firing rod by the needle unloading rod. The combination is ingenious and reasonable. The needle unloading operation is performed by pressing the tail handle, which is more convenient than the side needle unloading method.

[0083] Furthermore, the length extension direction of the guide post 61 on the tail handle 6 is located at the axial center of the housing 1, and the corresponding rear end stop 45 on the needle removal rod 4 is located at the axial center of the housing 1 and perpendicular to the axial center of the housing 1. This makes the operation feel better when pressing the tail handle from the tail end in the needle removal state and making the guide post on the tail handle act on the rear end stop of the needle removal rod. The force applied by the finger in the center is more even, and the force application during the needle removal process is more friendly, avoiding the jamming feeling caused by uneven force.

[0084] Furthermore, the rear end stop 45 of the needle removal rod 4 is provided with a column 47 for wrapping the guide post 61. The column 47 extends toward the tail end, and a guide slope 471 is provided on the inner side of the tail end of the column 47. This structure facilitates the positioning and cooperation between the guide post of the tail handle and the rear end stop on the needle removal rod, and also facilitates assembly and positioning.

[0085] In another embodiment of this utility model, in the needle removal state, after the guide post 61 of the tail handle 6 acts on the rear end stop 45 of the needle removal rod 4, it drives the injection rod 2 and the needle removal rod 4 to move a certain distance toward the head. Then, the injection rod 2 is restricted from moving toward the head by the housing 1, and the tail handle 6 continues to drive the needle removal rod 4 to move toward the head.

[0086] In another embodiment of this utility model, a launching spring 3 is fitted onto the firing rod 2, and the firing rod 2 is provided with a launching limiting surface 21 for abutting and compressing the head of the launching spring 3; the needle unloading rod 4 is provided with a reset limiting surface 44 for abutting and compressing the tail of the launching spring 3; the part where the reset limiting surface 44 is located can slide in the sliding space 24; in the loaded state, the firing rod 2 is locked after being loaded towards the tail, at which time the tail of the launching spring 3 is restricted by the reset limiting surface 44 of the needle unloading rod 4, and the launching spring 3 is compressed from the head to the tail. This fully utilizes the multiple linkages between the needle unloading rod, the firing rod, and the launching spring located in the same ejection cavity to achieve the simultaneous realization of the firing rod piercing driving force and the needle unloading rod reset driving force using a single launching spring.

[0087] Specifically, the needle ejector rod 4 is provided with a tail abutment 46 located at its tail end for positioning and abutting against the housing 1 to restrict the needle ejector rod 4 from moving towards the tail end. Corresponding to the tail abutment 46, a needle ejection limiting part 121 is provided on the housing 1. In the loaded state, the tail abutment 46 of the needle ejector rod 4 abuts against the needle ejection limiting part 121 of the housing 1 to restrict the needle ejector rod 4 from moving towards the tail end. At this time, the tail end of the firing spring 3 is restricted by the reset limiting surface 44 of the needle ejector rod 4, thereby causing the firing spring 3 to compress from the head to the tail end. This structure achieves the abutment and positioning of the needle ejector rod by the housing and the firing rod by the needle ejector rod in the loaded state, making the compression process of the firing spring from the head to the tail end more reliable and stable. By utilizing the spatial linkage between the housing and the needle ejector rod, and the spatial linkage between the firing rod and the needle ejector rod, the structure becomes more compact and stable. More specifically, the displacement path of the front end stop surface 41 on the needle ejector rod 4 is parallel to the central axis of the housing 1. This design ensures that the direction in which the firing spring compresses from the head to the tail in the loaded state and from the tail to the head in the unloaded state is parallel to the central axis of the housing, making it more convenient to use and improving the practical performance of the blood collection pen.

[0088] In one embodiment of this utility model, the middle part of the firing rod 2 is further provided with a sliding track 25 for the unloading rod 4 to slide. The part of the unloading action surface 42 on the unloading rod 4 slides in the sliding track 25; the part of the pressing limiting part 43 on the unloading rod 4 slides in the sliding space 24. This utilizes the spatial linkage between the firing rod and the unloading rod, making the overall mechanism more compact and easier to assemble. Furthermore, the firing limiting surface 21 and the pressing limiting surface 22 on the firing rod 2 are located on the part between the sliding space 24 and the sliding track 25 on the firing rod 2, and the position of the firing limiting surface 21 is closer to the head than the position of the pressing limiting surface 22. This allows for better linkage and cooperation with the firing spring and the unloading rod, so that when the firing spring is compressed from the head to the tail during loading, it can closely abut against the firing limiting surface, ensuring that the piercing driving force of the firing rod is accumulated. In the unloading state, the unloading rod can be reliably positioned when pressed to the bottom, avoiding excessive stroke of the unloading rod and making the arrangement more reasonable.

[0089] In another embodiment of this utility model, the needle ejector rod 4 is L-shaped, comprising a first segment 401 and a second segment 402 that are perpendicular to each other. The length of the first segment 401 extends parallel to the central axis of the housing 1, and the second segment 402 is located at the axial center of the housing 1 and is perpendicular to the central axis of the housing 1. This shape and structure of the needle ejector rod allows for better cooperation with the ejector rod, housing, and ejection spring, and also makes reasonable use of space, avoiding an excessively large overall size.

[0090] Furthermore, the front end stop 41 and the needle removal action surface 42 on the needle removal rod 4 are located on the first section 401, with the front end stop 41 located on the outward side of the first section 401 and the needle removal action surface 42 located on the inward side of the first section 401. This better ensures that the needle removal rod is firmly positioned when the pen cap is attached, and that the needle removal action surface on the first section acts on the blood collection needle located in the injection rod during unloading. The pressing limit part, the reset limit surface, and the rear end stop are located on the second section, with the pressing limit part and the reset limit surface located on the head-facing side of the second section and the rear end stop located on the tail-facing side of the second section. This better ensures that the injection rod is limited in the loaded state, and that the injection spring is limited by the guide post of the tail lever in the needle removal state to compress the injection spring. The design is reasonable.

[0091] In another embodiment of the present invention, the housing 1 is composed 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 pen cap 5 is detachably and fixedly connected to the front of the outer shell 11, and the tail handle 6 is sleeved on the inner wall of the tail of the outer shell 11.

[0092] Specifically, the needle ejector rod 4 is provided with a tail abutment 46 located at its tail end for positioning and abutting against the middle sleeve 12 to restrict the movement of the needle ejector rod 4 towards the tail end. Corresponding to the tail abutment 46, a needle ejection limiting part 121 is provided on the middle sleeve 12. In the loaded state, the tail abutment of the needle ejector rod abuts against the needle ejection limiting part of the housing to restrict the movement of the needle ejector rod towards the tail end. At this time, the tail end of the firing spring is restricted by the reset limiting surface of the needle ejector rod, thereby causing the firing spring to compress from the head to the tail end. This structure achieves the abutment and positioning effect of the housing against the needle ejector rod and the needle ejector rod against the firing rod in the loaded state, making the compression process of the firing spring from the head to the tail end more reliable and stable.

[0093] Furthermore, the front end of the middle sleeve 12 is provided with a notch 122 for sliding at the location of the front end stop 41 of the needle removal rod 4. This utilizes the spatial linkage between the housing and the needle removal rod to make the structure more compact and stable.

[0094] To better understand the composition and function of each component in this utility model, a detailed embodiment will be used to describe the specific composition and usage steps of this utility model in detail below.

[0095] The detachable needle scavenging pen proposed in this detailed embodiment includes a housing 1, a scavenging rod 2, a scavenging spring 3, a needle removal rod 4, a pen cap 5, and a tail handle 6.

[0096] In this detailed embodiment, the structure of housing 1 is referenced. 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 middle sleeve 12 has an ejection cavity inside. The front end of the middle sleeve 12 is provided with a notch 122 for sliding at the front end of the needle removal rod 4. The pen cap 5 is detachably and fixedly connected to the front of the outer shell 11. The front end of the pen cap 5 is provided with a blood collection end face. The tail handle 6 is sleeved on the inner wall of the tail of the outer shell 11. The tail handle 6 has a guide post 61 facing the front end.

[0097] In this detailed embodiment, the structure of the needle removal rod 4 is referenced. Figure 10 , Figure 11 and Figure 12 As shown, the needle removal rod 4 is a needle removal component on the blood collection pen used to push off the blood collection needle 8. The needle removal rod 4 extends into the ejection cavity of the housing 1 and acts in the direction of pushing off the blood collection needle 8. The needle removal rod 4 is parallel to the rod body of the ejection rod 2 in the ejection cavity. The ejection spring 3 is simultaneously fitted on the outside of the needle removal rod 4 and the rod body of the ejection rod 2. The needle removal rod 4 is provided with a front end stop surface 41 located at the front end and acting on the mouth of the pen cap 5 for preventing needle removal, a needle removal action surface 42 acting on the tail of the blood collection needle 8, a pressing and limiting part 43 acting on the ejection rod 2, a reset limiting surface 44 for abutting and compressing the tail of the ejection spring 3, and a rear end stop surface 45 located at the rear end and acting on the guide post 61 of the tail handle 6. The needle removal rod 4 is also provided with a tail end abutment part 46 located at the tail end for positioning and abutting against the housing 1 to limit the movement of the needle removal rod 4 to the tail end. Furthermore, the needle removal rod 4 is L-shaped, comprising a first segment 401 and a second segment 402 that are perpendicular to each other. The length extension direction of the first segment 401 is parallel to the central axis of the housing 1. The second segment 402 is located at the axial center of the housing 1 and is perpendicular to the axial center of the housing 1. The front end stop 41 and the needle removal working surface 42 on the needle removal rod 4 are located on the first segment 401, with the front end stop 41 located on the outward side of the first segment 401 and the needle removal working surface 42 located on the inward side of the first segment 401. The pressing limit part 43, the reset limit surface 44, and the rear end stop 45 are located on the second segment 402. The pressing limit part 43 and the reset limit surface 44 are located on the head-facing side of the second segment 402, and the rear end stop 45 is located on the tail-facing side of the second segment 402.

[0098] In this detailed embodiment, the structure of the firing rod 2 is referenced. Figure 13 , Figure 14 and Figure 15As shown, the firing rod 2 is provided with a firing limiting surface 21 for abutting and compressing the head of the firing spring 3, and a pressing limiting surface 22 for pressing the needle removal rod 4 to the bottom. Furthermore, a sliding space 24 is provided in the middle of the firing rod 2 for the needle removal rod 4 to slide, and the reset limiting surface 44, the pressing limiting part 43, and the rear end stop surface 45 on the needle removal rod 4 slide within this sliding space 24. A sliding track 25 is provided in the middle of the firing rod 2 for the needle removal rod 4 to slide, and the needle removal action surface 42 on the needle removal rod 4 slides within this sliding track 25. The firing limiting surface 21 and the pressing limiting surface 22 on the firing rod 2 are located between the sliding space 24 and the sliding track 25 on the firing rod 2, and the position of the firing limiting surface 21 is closer to the head than the position of the pressing limiting surface 22.

[0099] In this detailed embodiment, the assembly structure of the firing rod 2, the firing spring 3, and the needle unloading rod 4 can be referred to Figure 2 , Figure 3 , Figure 4 As shown, the launching spring 3 is simultaneously fitted onto the outer side of both the needle removal rod 4 and the launching rod 2. The head of the launching spring 3 abuts against the launching limiting surface 21 on the launching rod 2, and the head of the launching spring 3 abuts against the reset limiting surface 44 on the needle removal rod 4. The head of the launching spring 3 is restricted and positioned by the launching limiting surface 21 of the launching rod 2, and the tail of the launching spring 3 is restricted and positioned by the reset limiting surface 44 of the needle removal rod 4. The launching spring 3 provides the puncture driving force for the launching rod 2 and the reset driving force for the needle removal rod 4.

[0100] The stenography pen in this detailed embodiment is configured to have an initial state, a loaded state, a puncture state, a needle removal state, and a completed needle removal state.

[0101] In the initial state, reference Figures 5 to 9 As shown, the pen cap 5 is rotated and assembled onto the middle sleeve 12, forming a relatively fixed relationship. The front end stop 41 of the needle removal rod 4 is blocked by the opening of the pen cap 5 (as shown). Figure 7 As shown in the enlarged schematic diagram of Part I), the tail lever 6 cannot be pressed, and the launching spring 3 is located between the launching rod 2 and the ejector rod 4 (as shown in the enlarged schematic diagram of Part I). Figure 8 (As shown in the enlarged schematic diagram of Part II). Additionally, the tail of the needle ejector bar 4 abuts against the inner sleeve 12 (as shown in the enlarged schematic diagram of Part II). Figure 9 (As shown in the enlarged schematic diagram of Part III), the needle removal rod 4 is restricted from moving to the right.

[0102] In the loaded state, reference Figures 16 to 17 As shown, when the blood collection needle 8 is inserted, the injection rod 2 moves to the right. At this time, the tail of the needle removal rod 4 is restricted by the middle sleeve 12. The reset limiting surface 44 of the injection spring 3 on the needle removal rod 4 is relatively fixed, and the injection spring 3 is compressed (it can be understood that the right side of the injection spring 3 is fixed and the spring is compressed from left to right) until the top spring piece 23 of the injection rod 2 is locked by the middle sleeve 12.

[0103] In the puncture state, refer to Figures 18 to 19 As shown, pressing the launch button 7 (represented by the arrow) unlocks the spring 23 at the top of the launch lever 2. Driven by the launch spring 3, the launch lever 2 moves to the left, causing the lancing device needle to complete the puncture. After the puncture is completed, the launch spring 3 is in a relatively balanced position, allowing the lancing device needle tip to be placed inside the pen cap 5.

[0104] In the needle removal state, refer to Figures 20 to 21 As shown, rotate the pen cap 5 to remove it. At this time, the front end stop 41 of the needle removal lever 4 is released from constraint. Press the tail handle 6. The guide post 61 inside the tail handle 6 acts on the tail of the needle removal lever 4, causing the injection rod 2 to start moving to the left. Continue to press the tail handle 6. At this time, the tail of the injection rod 2 is restricted, limiting the movement of the injection rod 2 to the left. Continue to press the tail handle 6. The firing limiting surface 21 of the firing spring 3 on the injection rod 2 is relatively fixed. The firing spring 3 starts to compress from right to left. The needle removal action surface 42 on the needle removal lever 4 abuts against the tail of the blood collection needle 8. Continue to press the tail handle 6. At this time, the needle removal lever 4 is restricted by the pressing limiting surface 22 on the injection rod 2 for pressing the needle removal lever 4 to the bottom. The tail handle 6 can no longer be pressed. The blood collection needle 8 is completely pushed out by the needle removal lever 4. The blood collection needle 8 is released from constraint and can freely fall off the needle seat on the injection rod 2.

[0105] After the needle removal is complete, refer to... Figure 22 As shown, when the tail handle 6 is released, the launching spring 3 returns to its free length to the right, causing the needle removal rod 4 to move to the right as well (at the same time, the tail handle 6 also moves to the right) until the tail of the needle removal rod 4 is limited by the middle sleeve 12, and the launching spring 3 returns to a relative balance.

[0106] Through the detailed description of the structure and usage steps of the above embodiments and corresponding detailed embodiments, this utility model has optimized and improved the needle removal rod. By limiting the front end of the needle removal rod with the pen cap opening, the needle removal operation cannot be performed when the lancing pen is in the pen cap installed state. The needle can only be removed when the pen cap is removed, which avoids the inconvenience caused by previous misoperation, improves the reliability and operation performance of the lancing pen, and achieves the purpose of this utility model.

[0107] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A needle-removable blood sampling pen comprising a housing (1), a launching rod (2), a needle-removable rod (4) and a pen cap (5), wherein: the housing (1) is a pen housing structure of the blood sampling pen, and a launching cavity is arranged in the housing (1); the launching rod (2) is a launching component with a head capable of inserting a blood sampling needle (8), and the launching rod (2) is arranged in the launching cavity of the housing (1); an upper chamber locking and unlocking structure is arranged between the launching rod (2) and the housing (1); the needle-removable rod (4) is a needle-removable component for pushing and removing the blood sampling needle (8) on the blood sampling pen, and the needle-removable rod (4) extends into the launching cavity of the housing (1) and acts on the blood sampling needle (8) in a direction for pushing and removing the blood sampling needle (8); and the pen cap (5) is detachably and fixedly connected to the front part of the housing (1). Characterized in that: the needle-removable rod (4) is arranged in parallel with the rod body of the launching rod (2) in the launching cavity, and the needle-removable rod (4) is sequentially provided with a front end blocking surface (41) for preventing needle removal at the front end and acting on the mouth of the pen cap (5), a needle-removable acting surface (42) acting on the tail of the blood sampling needle (8), and a pressing limiting part (43) for acting on the launching rod (2); the launching rod (2) is provided with a pressing limiting surface (22) for pressing the needle-removable rod (4) to the bottom; and a sliding space (24) is formed in the middle part of the launching rod (2) for the sliding of the needle-removable rod (4); in the needle-removable state, the pen cap (5) is released from the abutting constraint of the front end blocking surface (41) of the needle-removable rod (4), and the needle-removable rod (4) is pressed from the tail until the needle-removable acting surface (42) of the needle-removable rod (4) abuts against the tail of the blood sampling needle (8); when the pressing limiting part (43) of the needle-removable rod (4) is limited by the pressing limiting surface (22) of the launching rod (2), the blood sampling needle (8) is completely pushed out by the needle-removable rod (4). The tail of the housing (1) is sleeved and matched with a tail handle (6), and the tail handle (6) is provided with a guide column (61) facing the front end.

2. The needle removalable blood sampling pen according to claim 1, wherein: The needle-removable rod (4) is provided with a rear end blocking surface (45) at the rear end and acting on the guide column (61) of the tail handle (6), and the rear end blocking surface (45) is arranged at a position capable of sliding in the sliding space (24); after the tail handle (6) is pressed from the tail in the needle-removable state, the guide column (61) of the tail handle (6) acts on the rear end blocking surface (45) of the needle-removable rod (4) to make the needle-removable rod (4) move towards the head.

3. The needle removalable blood sampling pen according to claim 2, wherein: The length extension direction of the guide column (61) on the tail handle (6) is located on the axial center of the housing (1), and the rear end blocking surface (45) on the needle-removable rod (4) is arranged at the axial center of the housing (1) and perpendicular to the axial center of the housing (1).

4. The needle removalable blood sampling pen according to claim 3, wherein: The rear end blocking surface (45) on the needle-removable rod (4) is provided with a column (47) for wrapping the guide column (61), the column (47) is arranged to extend towards the tail, and a guide inclined surface (471) is arranged inside the tail of the column (47).

5. The needle removalable blood sampling pen according to claim 3, wherein: ​ 6. The lancing device of claim 2 or 3, wherein: In the needle removal state, the guide column (61) of the tail handle (6) acts on the rear end stop surface (45) of the needle removal rod (4) to drive the firing rod (2) and the needle removal rod (4) to move towards the head by a distance, then the firing rod (2) is limited to move towards the head by the shell (1), and the tail handle (6) continues to drive the needle removal rod (4) to move towards the head.

7. The needle removalable blood sampling pen according to claim 1, wherein: The firing rod (2) is sleeved with a firing spring (3), and the firing rod (2) is provided with a firing limiting surface (21) for abutting and compressing the head of the firing spring (3); the needle removal rod (4) is provided with a reset limiting surface (44) for abutting and compressing the tail of the firing spring (3); the position of the reset limiting surface (44) can slide in the sliding space (24); In the cocking state, the firing rod (2) is locked after being cocked towards the tail direction, at this time, the tail of the firing spring (3) is limited by the reset limiting surface (44) of the needle removal rod (4), and the firing spring (3) is compressed from the head to the tail.

8. The needle removalable blood sampling pen according to claim 7, wherein: The needle removal rod (4) is provided with a tail abutting portion (46) located at the tail for positioning and abutting against the shell (1) to limit the movement of the needle removal rod (4) towards the tail, and a needle removal limiting portion (121) corresponding to the tail abutting portion (46) is arranged on the shell (1), in the cocking state, the tail abutting portion (46) of the needle removal rod (4) abuts against the needle removal limiting portion (121) of the shell (1) to limit the movement of the needle removal rod (4) towards the tail, at this time, the tail of the firing spring (3) is limited by the reset limiting surface (44) of the needle removal rod (4), so that the firing spring (3) is compressed from the head to the tail.

9. The needle removalable blood sampling pen according to claim 1, wherein: The displacement path of the front end stop surface (41) on the needle removal rod (4) is parallel to the central axis of the shell (1).

10. The needle removalable blood sampling pen according to claim 1, wherein: The middle part of the firing rod (2) is also provided with a sliding track (25) for sliding of the needle removal rod (4), and the position of the needle removal acting surface (42) on the needle removal rod (4) slides in the sliding track (25). The position of the pressing limiting portion (43) on the needle removal rod (4) slides in the sliding space (24).

11. The lancing device of claim 10, wherein: The firing limiting surface (21) and the pressing limiting surface (22) on the firing rod (2) are located on the part between the sliding space (24) and the sliding track (25) on the firing rod (2), and the position of the firing limiting surface (21) is closer to the head relative to the position of the pressing limiting surface (22).

12. The needle removalable blood sampling pen according to claim 1, wherein: The needle removal rod (4) is L-shaped and includes a first segment (401) and a second segment (402) perpendicular to each other, wherein the length extension direction of the first segment (401) is parallel to the central axis of the shell (1), and the second segment (402) is arranged at the axial center of the shell (1) and perpendicular to the central axis of the shell (1).

13. The lancing device of claim 12, wherein: The front end stop surface (41) and the needle removal acting surface (42) on the needle removal rod (4) are arranged on the first segment (401), and the front end stop surface (41) is located on the outward side of the first segment (401), and the needle removal acting surface (42) is located on the inward side of the first segment (401).

14. The needle removalable lancing device of claim 2, wherein: The shell (1) is composed of an outer shell (11) and a middle sleeve (12), the middle sleeve (12) is a cylindrical structure, the middle sleeve (12) is fixedly connected to the inside of the outer shell (11), the cap (5) is detachably fixedly connected to the front of the outer shell (11), and the tail handle (6) is sleeved on the tail inner wall of the outer shell (11).

15. The lancing device of claim 14, wherein: The needle removing rod (4) is provided with a tail abutting portion (46) located at the tail portion for positioning and abutting against the middle sleeve (12) to limit the movement of the needle removing rod (4) to the tail portion, and a needle removing limiting portion (121) is arranged on the middle sleeve (12) corresponding to the tail abutting portion (46).

16. The lancing device of claim 14, wherein: The middle sleeve (12) is provided with a notch (122) at the front end for the front end of the needle removing rod (4) to slide.

Images