Blood sampling pen

Abstract

The blood sampling pen comprises a shell, an ejection rod, an ejection spring, a needle unloading rod and a tail handle, the needle unloading rod is arranged in an ejection cavity and is parallel to an ejection rod body, and the ejection spring is arranged on the outer side of the needle unloading rod and the outer side of the ejection rod body in a sleeving mode at the same time; the needle unloading acting surface acts on the tail portion of the blood taking needle, the reset limiting surface is used for abutting against and compressing the tail portion of the emitting spring, the rear end blocking surface is located at the rear end and acts on a guide column of the tail handle, and the emitting rod is provided with an emitting limiting surface used for abutting against and compressing the head portion of the emitting spring. Compared with a blood sampling pen with few parts, the blood sampling pen has the advantages that two parts can be reduced, space and structure linkage between the needle unloading rod and the tail handle and space and structure linkage between the needle unloading rod and the injection rod are fully utilized, the structure is optimized, functions are reliably and stably achieved, and the manufacturing cost can be greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of blood sampling instruments, in particular to a blood sampling pen used for peripheral blood sampling. Background Art

[0002] The lancing pen is a blood collection device used in conjunction with a disposable lancet, wherein the lancing pen is reusable, while the lancet is only used once to avoid cross infection. The development of lancing pens has a history of several decades, and the improvement of lancing pens has also gone through many stages. At present, lancing pens are gradually becoming mature, but in the development history of lancing pens, how to improve the safety, reliability, convenience, economy, user experience and user experience of lancing pens has always been a concern of technicians in this field.

[0003] China Patent CN108836357B announced the authorization of an invention patent with patent number 201520742270.X, named "A blood collection pen with retractable needle and assembly method". This patent solves the problem of inconvenience in operation caused by side needle withdrawal, makes beneficial improvements in ease of use, and achieves positive results. The concept of this patent is to design a firing needle withdrawal structure including a guide sleeve, an inner core, a needle withdrawal key, a needle withdrawal inner core, an elastic member and a button, wherein the elastic member includes a firing spring, a reset spring 1 and a reset spring 2 sleeved on the inner core arm; when withdrawing the needle, remove the pen cap and apply a pressing force F to the closed end of the tail cap to make the needle withdrawal key move axially toward the needle outlet. When the top surface of the convex rib 1 of the needle withdrawal key abuts against the inclined guide surface 1 of the notch of the guide sleeve, since both surfaces are inclined and the convex rib 1 is elastic, the convex rib 1 retracts radially, and during the continued axial movement, the convex rib 1 abuts against the hanging platform, thereby pushing the blood collection needle out of the needle seat; at this time, the pressing force is cancelled, and the tail cap returns to its original position under the action of the second reset spring, completing the needle withdrawal function; the patent solution requires the use of a guide sleeve, a needle withdrawal key, and a needle withdrawal inner core in the needle withdrawal process, and these components work together and are indispensable. In the process of needle withdrawal and resetting, a second reset spring needs to be separately set to achieve resetting; it can be seen that the shortcomings of this patent are that there are many parts, which require close cooperation between the parts, the overall structure is complex, the process is difficult, the assembly time is long, and the manufacturing cost is high.

[0004] In view of this, how to solve the problems of the existing needle removal structure in the blood collection pen needle, such as complex overall structure, difficult process, long assembly time, high manufacturing cost, etc., has become the subject to be studied and solved by the present invention. Summary of the invention

[0005] The purpose of the invention is to provide a blood collection pen.

[0006] To achieve the above object, the technical solution adopted by the present invention is: the present invention proposes a blood collection device, including a shell, a shooting rod, a shooting spring, a needle removal rod and a tail handle, wherein: The shell is the pen shell structure of the lancing pen, and an ejection cavity is arranged in the shell; the firing rod is a firing component with a head capable of inserting a lancing needle, and the firing rod is located in the ejection cavity of the shell; a loading locking and unlocking structure is arranged between the firing rod and the shell; the firing spring is an elastic component on the lancing pen used to provide ejection force, and the firing spring acts in the ejection direction of the firing rod; the needle removal rod is a needle removal component on the lancing pen used to push and remove the lancing needle; the tail handle is located at the tail of the shell, and is sleeved with the shell; Its innovation lies in: The tail handle is provided with a guide column facing the front end.

[0007] The needle unloading rod is located in the ejection cavity of the shell and acts in the direction of pushing and unloading the blood collection needle; the needle unloading rod is parallel to the shooting rod body in the ejection cavity, and the firing spring is sleeved on the shooting rod body; the needle unloading rod is located on the outside or inside of the firing spring; the needle unloading rod is provided with a needle unloading action surface acting on the tail of the blood collection needle, a reset limit surface for abutting against and compressing the tail of the firing spring, and a rear end stop surface located at the rear end and acting on the guide column of the tail handle.

[0008] The shooting rod is provided with a shooting limit surface for abutting against and compressing the head of the shooting spring.

[0009] In the loaded state, the shooting rod is loaded toward the tail and then locked. At this time, the tail of the shooting spring is limited by the reset limit surface of the unloading needle rod, and the shooting spring is compressed from the head to the tail.

[0010] In the puncture state, after the shooting rod is unlocked, the shooting spring drives the blood collection needle to move toward the head to complete the puncture.

[0011] In the needle unloading state, after pressing the tail handle from the tail, the guide column of the tail handle acts on the rear end stop surface on the needle unloading rod to move the needle unloading rod toward the head. At this time, the head of the launching spring is restricted by the launching limit surface of the shooting rod, and the launching spring is compressed from the tail to the head until the needle unloading action surface on the needle unloading rod presses against the tail of the blood collection needle, and the blood collection needle is pushed out.

[0012] When the needle unloading is completed, after the pressure on the tail handle is released, the needle unloading rod and the tail handle are driven by the launching spring to move toward the tail to complete the reset.

[0013] The relevant contents of the present invention are explained as follows: 1. In the above technical scheme of the present invention, in-depth research and design are carried out to solve the problems of complex overall structure, difficult process, long assembly time and high manufacturing cost of the needle unloading structure in the existing blood collection pen needle. The blood collection pen of the present invention mainly carries out creative improvement design on the needle unloading rod and the shooting rod and firing spring matched with the needle unloading rod, and utilizes the firing spring to realize the puncture driving force of the shooting rod and the reset driving force of the needle unloading rod at the same time, wherein the needle unloading rod is arranged in the ejection cavity and parallel to the shooting rod body, the firing spring is sleeved on the shooting rod body, and the needle unloading rod is provided with a needle unloading action surface acting on the tail of the blood collection needle, a reset limit surface for abutting and compressing the tail of the firing spring, and a rear end stop surface located at the rear end and acting on the guide column of the tail handle. In the loaded state When the needle is unloaded, the tail of the shooting rod is locked after loading in the tail direction. At this time, the tail of the shooting spring is limited by the reset limit surface of the needle unloading rod, and the shooting spring is compressed from the head to the tail; in the puncture state, after the shooting rod is unlocked, the blood collection needle is driven to move toward the head to complete the puncture; in the needle unloading state, after the tail handle is pressed from the tail, the guide column of the tail handle acts on the rear end blocking surface on the needle unloading rod to displace the needle unloading rod toward the head. At this time, the head of the shooting spring is limited by the firing limit surface of the shooting rod, and the shooting spring is compressed from the tail to the head until the needle unloading action surface on the needle unloading rod abuts against the tail of the blood collection needle, and the blood collection needle is pushed out; in the needle unloading state, after the pressure on the tail handle is released, the needle unloading rod is driven by the shooting spring to move toward the tail to complete the reset. In the above-mentioned loading state and puncture state, when loading, the tail handle drives the shooting rod toward the tail direction, and the firing spring is compressed when loading. After the shooting rod is unlocked, the blood collection needle is driven to move toward the head to complete the puncture under the drive of the firing spring. It can be concluded that the puncture driving force of the shooting rod is realized by the firing spring; in the above-mentioned needle unloading state and the needle unloading completion state, when unloading the needle, the guide column of the tail handle acts on the rear end blocking surface on the needle unloading rod to displace the needle unloading rod toward the head, and compresses the firing spring from the tail to the head. After the pressure on the tail handle is released, the needle unloading rod is driven to move toward the tail to complete the reset under the drive of the firing spring, thereby concluding that the reset driving force of the needle unloading rod is realized by the firing spring; the structural design is ingenious and reasonable, and full of The invention makes full use of the multiple linkages among the needle unloading rod, the shooting rod and the shooting spring in the same ejection cavity to realize the purpose of using one shooting spring to simultaneously realize the puncture driving force of the shooting rod and the resetting driving force of the needle unloading rod. Compared with the conventional blood collection pen with a needle unloading rod and automatic resetting of the needle unloading rod, it uses fewer parts. Compared with the blood collection pen with relatively few parts, it can reduce two parts. The spatial and structural linkages between the needle unloading rod and the tail handle, and between the needle unloading rod and the shooting rod are fully utilized, the structure is optimized, the function is reliably and stably realized, the manufacturing cost can be greatly reduced, and the assembly process is less, the working hours are long, the manufacturing is simplified, and it makes a significant contribution to increasing the competitiveness of the product.

[0014] 2. In the above technical solution, the unloading needle rod is provided with a tail abutment portion located at the tail for positioning against the shell to limit the movement of the unloading needle rod to the tail, and a needle unloading limit portion is provided on the shell corresponding to the tail abutment portion. In the loaded state, the tail abutment portion of the unloading needle rod abuts against the unloading needle limit portion of the shell to limit the movement of the unloading needle rod to the tail, and at this time, the tail of the firing spring is limited by the reset limit surface of the unloading needle rod, so that the firing spring is compressed from the head to the tail. This structure is used to achieve the role of the shell on the unloading needle rod and the unloading needle rod on the firing rod in the loaded state, so that the process of compressing the firing spring from the head to the tail is more reliable and stable, and the space linkage between the shell and the unloading needle rod and the space linkage between the firing rod and the unloading needle rod are used to make the structure more compact and more stable.

[0015] 3. In the above technical solution, the compression stroke of the launching spring from the head to the tail in the loaded state is smaller than the compression stroke of the launching spring from the tail to the head in the needle unloading state, so that the needle unloading rod can be quickly reset after the needle is unloaded, making the use rhythm of the lancing pen more reasonable.

[0016] 4. In the above technical solution, in the needle unloading state, the guide column of the tail handle acts on the rear end stop surface on the needle unloading rod to drive the shooting rod and the needle unloading rod to move toward the head for a distance, and then the shooting rod is restricted by the shell to move toward the head, and the tail handle continues to drive the needle unloading rod to move toward the head, so that the needle unloading process has a sense of segmentation, and the structural design and spatial layout of the shooting rod and the needle unloading rod can be more convenient, and easy to assemble and produce.

[0017] 5. In the above technical solution, the length extension direction of the guide column on the tail handle is located on the axial center of the shell, and the corresponding rear end stop surface on the needle unloading rod is arranged at the axial center of the shell and is perpendicular to the axial center of the shell, so that in the needle unloading state, the operation feel of the process of pressing the tail handle from the tail and making the guide column on the tail handle act on the rear end stop surface on the needle unloading rod is better, the fingers located in the center can exert force more evenly, and the force in the needle unloading process is more friendly, avoiding the feeling of sticking caused by uneven force.

[0018] 6. In the above technical solution, the rear end stop surface on the needle unloading rod is provided with a column for wrapping the guide column, the column is extended toward the tail, and a guide slope is provided on the inner side of the tail of the column. This structure facilitates the positioning and cooperation between the guide column of the tail handle and the rear end stop surface on the needle unloading rod, and also facilitates assembly and positioning.

[0019] 7. In the above technical solution, the needle unloading rod is provided with a pressing limit portion for acting on the shooting rod, and the shooting rod is provided with a pressing limit surface for pressing the needle unloading rod to the bottom. In the needle unloading state, when the pressing limit portion of the needle unloading rod is restricted by the pressing limit surface on the shooting rod, the blood collection needle is completely pushed out by the needle unloading rod.

[0020] 8. In the above technical solution, a sliding space for the needle unloading rod to slide is provided in the middle of the shooting rod, and the reset limit surface, the pressing limit portion, and the rear end stop surface on the needle unloading rod slide in the sliding space; a sliding track for the needle unloading rod to slide is provided in the middle of the shooting rod, and the needle unloading action surface on the needle unloading rod slides in the sliding track; this more specific structure is used to achieve a closer and more ingenious coordination relationship between the shooting rod and the needle unloading rod, and better utilize the layout of the ejection space in the shell. The structure is compact, reasonable and ingenious, and it is also convenient for assembly between the shooting rod and the needle unloading rod.

[0021] 9. In the above technical solution, the firing limit surface and the pressing limit surface on the firing rod are located between the sliding space and the sliding track on the firing rod, and the firing limit surface is located closer to the head relative to the pressing limit surface. This allows for better linkage with the firing spring and the needle removal rod, so that the firing spring can be tightly pressed against the firing limit surface when compressed from the head to the tail during loading, ensuring that the piercing driving force of the firing rod is accumulated, and in the needle removal state, the needle removal rod can be pressed to the bottom and reliably positioned, avoiding excessive travel of the needle removal rod, and making the arrangement more reasonable.

[0022] 10. In the above technical solution, the needle unloading rod is L-shaped or T-shaped, and includes a first section and a second section perpendicular to each other, wherein the length extension direction of the first section is parallel to the central axis of the shell, and the second section is arranged at the axial center of the shell and is perpendicular to the axial center of the shell. The needle unloading rod with this shape structure can further better cooperate with the shooting rod, the shell and the shooting spring, and can reasonably utilize the space occupied to avoid the overall volume being too large.

[0023] 11. In the above technical solution, the needle unloading action surface on the needle unloading rod is arranged on the first section, and during unloading, the needle unloading action surface located on the first section acts on the blood collection needle located in the shooting rod; the reset limit surface and the rear end blocking surface are located on the second section, and the reset limit surface is located on the side of the second section facing the head, and the rear end blocking surface is located on the side of the second section facing the tail, so as to better realize the limitation of the shooting rod in the loaded state, and in the needle unloading state, it is pushed by the guide column of the tail handle to limit the shooting spring to compress the shooting spring, and the arrangement is reasonable.

[0024] 12. In the above technical solution, the shell is composed of an outer shell and a middle sleeve. The main body of the middle sleeve is a cylindrical structure. The middle sleeve is fixedly connected to the inside of the outer shell. The front part of the outer shell is detachably and fixedly connected with a pen cap. The tail puller is connected to the inner wall of the rear part of the outer shell, so that the various components can be better assembled in the shell.

[0025] 13. In the above technical solution, the needle unloading rod is provided with a tail abutting portion located at the tail for positioning against the middle sleeve to limit the movement of the needle unloading rod toward the tail, and a needle unloading limiting portion is provided on the middle sleeve corresponding to the tail abutting portion, so as to limit the movement of the needle unloading rod toward the tail in the loaded state, and then the needle unloading rod limits the loading of the shooting rod, which is more clever and reasonable.

[0026] 14. In the present invention, the meaning of "front" in "forward", "front end", etc. is the direction pointed by the needle tip of the needle core or the shooting direction of the needle core, which is the direction of blood collection. The meaning of "rear" in "rear end", "rear part", etc. is the direction pointed by the tail of the shell or the opposite direction of the shooting direction of the needle core.

[0027] Due to the application of the above scheme, the present invention has the following advantages and effects compared with the prior art: 1. The scheme of the present invention is to conduct in-depth research and design on the problems of the complex overall structure, difficult process, long assembly time, high manufacturing cost, etc. of the needle removal structure in the existing blood collection pen needle. The blood collection pen of the present invention mainly makes creative improvement designs on the needle removal rod and the shooting rod and shooting spring matched with the needle removal rod, and uses a shooting spring to simultaneously realize the puncture driving force of the shooting rod and the reset driving force of the needle removal rod. In the loaded state and the puncture state, when loading, the tail handle drives the shooting rod toward the tail direction, and the firing spring is compressed when loading. After the shooting rod is unlocked, the blood collection needle is driven to move toward the head to complete the puncture under the drive of the firing spring. It can be concluded that the puncture driving force of the shooting rod is realized by the firing spring; in the above-mentioned needle unloading state and the needle unloading completion state, when unloading the needle, the guide column of the tail handle acts on the rear end blocking surface on the needle unloading rod to displace the needle unloading rod toward the head, and compresses the firing spring from the tail to the head. After the pressure on the tail handle is released, the needle unloading rod is driven to move toward the tail to complete the reset under the drive of the firing spring. It can be concluded that the reset driving force of the needle unloading rod is realized by the firing spring.

[0028] 2. The scheme of the present invention is ingeniously and reasonably designed in structure. It makes full use of the multiple linkages between the needle unloading rod, the shooting rod, and the shooting spring in the same ejection cavity to achieve the purpose of using one shooting spring to simultaneously realize the puncture driving force of the shooting rod and the reset driving force of the needle unloading rod. Compared with the conventional blood collection pen with a needle unloading rod and automatic reset of the needle unloading rod, it uses fewer parts. Compared with the blood collection pen with relatively few parts, it can reduce two parts, which is more difficult in research and development and design. It makes full use of the spatial and structural linkages between the needle unloading rod and the tail handle, and between the needle unloading rod and the shooting rod. The structure is optimized, and the function is reliably and stably realized, which can greatly reduce the manufacturing cost. In addition, the assembly process is less, the working hours are long, and the manufacturing is simplified, which makes a significant contribution to increasing the competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the explosion of the blood collection device in an embodiment of the present invention; Figure 2 1. is a three-dimensional schematic diagram of an L-shaped needle unloading rod in an embodiment of the present invention (viewing angle 1); Figure 3 Schematic diagram of an L-shaped needle unloading rod in an embodiment of the present invention (viewing angle 2); Figure 4 It is a front view of the L-shaped needle unloading rod in the embodiment of the present invention; Figure 5 is a three-dimensional schematic diagram of a shooting rod in an embodiment of the present invention; Figure 6 is a top view of the shooting rod in an embodiment of the present invention; Figure 7 A bottom view of the shooting rod in the embodiment of the present invention; Figure 8 It is a three-dimensional schematic diagram of the assembly of the shooting rod, the shooting spring, and the L-shaped unloading needle rod in the embodiment of the present invention; Fig. 9 It is a front view of the assembly of the shooting rod, the shooting spring and the L-shaped unloading needle rod in the embodiment of the present invention; Fig.10 It is a top view of the assembly of the shooting rod, the shooting spring, and the L-shaped unloading needle rod in the embodiment of the present invention; Fig.11 This is a schematic diagram of the lancing device in an initial state according to an embodiment of the present invention; Fig.12 Schematic cross-sectional view of the blood collection device in an initial state according to an embodiment of the present invention; Fig.13 for Fig.12 The enlarged schematic diagram of Part I in FIG. Fig.14 for Fig.12 The enlarged schematic diagram of part II in FIG. Fig.15This is a schematic diagram of the blood collection device in a loaded state according to an embodiment of the present invention; Fig.16 It is a cross-sectional schematic diagram of the blood collection device in the loaded state according to the embodiment of the present invention; Fig.17 This is a schematic diagram of the blood collection device in the puncture state according to an embodiment of the present invention; Fig.18 It is a cross-sectional schematic diagram of the blood collection device in the puncture state according to an embodiment of the present invention; Fig.19 This is a schematic diagram of the blood collection device according to an embodiment of the present invention after puncture is completed; Fig. 20 This is a cross-sectional schematic diagram of the blood collection device according to an embodiment of the present invention after puncture is completed; Fig.21 This is a schematic diagram of the blood collection device in the needle removal state 01 according to an embodiment of the present invention; Fig. 22 This is a cross-sectional schematic diagram of the blood collection device according to an embodiment of the present invention in the needle removal state 01; Fig.23 This is a schematic diagram of the blood collection device in the needle removal state 02 according to an embodiment of the present invention; Fig.24 It is a cross-sectional schematic diagram of the blood collection device according to an embodiment of the present invention in the needle removal state 02; Fig.25 This is a schematic diagram of the blood collection device in the needle removal state 03 according to an embodiment of the present invention; Fig.26 This is a cross-sectional schematic diagram of the blood collection device according to an embodiment of the present invention in the needle removal state 03; Fig. 27 for Fig.26 The enlarged schematic diagram of Part III in FIG. Fig.28 This is a cross-sectional schematic diagram of the blood collection device according to an embodiment of the present invention after the needle is removed; Fig.29 1. A three-dimensional schematic diagram of a T-shaped needle unloading rod in an embodiment of the present invention (viewing angle 1); Fig.30 Schematic diagram of a three-dimensional T-shaped needle unloading rod in an embodiment of the present invention (viewing angle 2); Fig.31 It is a three-dimensional schematic diagram of the assembly of the shooting rod, the shooting spring, and the T-shaped unloading needle rod in the embodiment of the present invention; Fig.32 It is a front view of the assembly of the shooting rod, the shooting spring and the T-shaped unloading needle rod in the embodiment of the present invention; Fig.33 It is a cross-sectional schematic diagram of using a T-shaped needle unloading rod to unload needles in an embodiment of the present invention.

[0030] The various parts of the above drawings are shown as follows: 1. Shell; 11. outer shell; 12. middle sleeve; 121. needle removal limiting part; 2. Shooting rod; 21. Launch limit surface; 22. Press limit surface; 23. Shrapnel; 24. Sliding space; 25. Sliding track; 3. Launch spring; 4. Remove the needle bar; 401, first paragraph; 402, second paragraph; 42. Needle unloading action surface; 43. Pressing limit portion; 44. Reset limit surface; 45. Rear end stop surface; 46. Tail end abutment portion; 47, column; 471, guide slope; 5. Pen cap; 6. Tail handle; 61. Guide column; 7. Launch button; 8. Blood collection needle. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Embodiment: The present invention will be clearly described below with diagrams and detailed descriptions. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the techniques taught by the present invention without departing from the spirit and scope of the present invention.

[0032] The terms used herein are only for describing specific embodiments and are not intended to be limiting of the present invention. Singular forms such as "a", "this", "here", "this" and "the" as used herein also include plural forms.

[0033] The terms “first”, “second”, etc. used in this document do not specifically refer to an order or sequence, nor are they used to limit the present case. They are only used to distinguish components or operations described with the same technical terms.

[0034] As used herein, “connected” or “positioned” may refer to two or more components or devices being in direct physical contact with each other, or being in indirect physical contact with each other, or may refer to two or more components or devices operating or moving with each other.

[0035] The words “include,” “including,” and “have” used in this document are open-ended terms, meaning including but not limited to.

[0036] The terms used in this document generally have the ordinary meaning of each term used in this field, in the context of the case and in the specific context, unless otherwise noted. Certain terms used to describe the present invention will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present invention.

[0037] The terms "front", "back", "upper" and "lower" used in this article are directional terms. In this case, they are only used to illustrate the positional relationship between the structures and are not used to limit the protection plan of this case and the specific direction during actual implementation.

[0038] The present invention aims to take into account the problems of the existing needle removal structure in the blood collection pen needle, such as the complex overall structure, difficult process, long assembly time, high manufacturing cost, etc., and make corresponding ingenious improvement designs in a targeted manner. The main improvement designs are creatively made to the needle removal rod and the shooting rod, shooting spring and other structures that cooperate with the needle removal rod, and the shooting spring is used to simultaneously realize the puncture driving force of the shooting rod and the reset driving force of the needle removal rod.

[0039] See also Figures 1 to 10 As shown, an embodiment of the present invention provides a blood collection pen, which includes a housing 1, a shooting rod 2, a shooting spring 3, a needle removal rod 4, a pen cap 5 and a tail handle 6, wherein: The shell 1 is a pen shell structure of the blood collection pen, and an ejection cavity is arranged in the shell 1.

[0040] The shooting rod 2 is a launching component with a head capable of inserting a blood collection needle 8 , and the shooting rod 2 is located in the launching cavity of the shell 1 ; a loading locking and unlocking structure is provided between the shooting rod 2 and the shell 1 .

[0041] The launching spring 3 is an elastic component on the lancing device for providing an ejection force, and the launching spring 3 acts in the ejection direction of the ejection rod 2 .

[0042] The needle unloading rod 4 is a needle unloading component used for pushing and unloading the blood collection needle 8 on the blood collection device.

[0043] The tail handle is located at the tail of the shell and is sleeved with the shell.

[0044] In the innovative design of the embodiment of the present invention, the tail handle 6 has a guide column 61 facing the front end.

[0045] The needle unloading rod 4 is located in the ejection chamber of the shell 1 and acts in the direction of pushing and unloading the blood collection needle 8; the needle unloading rod 4 is parallel to the rod body of the shooting rod 2 in the ejection chamber, and the firing spring 3 is sleeved on the rod body of the shooting rod 2; the needle unloading rod 4 is located on the outside or inside of the firing spring 3; the needle unloading rod 4 is provided with a needle unloading action surface 42 that acts on the tail of the blood collection needle 8, a reset limit surface 44 for abutting against and compressing the tail of the firing spring 3, and a rear end stop surface 45 located at the rear end and acting on the guide column 61 of the tail handle 6.

[0046] The shooting rod 2 is provided with a shooting limit surface 21 for abutting against and compressing the head of the shooting spring 3 .

[0047] The usage status of the above components is as follows: In the loaded state, the shooting rod 2 is loaded toward the tail and locked. At this time, the tail of the shooting spring 3 is limited by the reset limit surface 44 of the unloading needle rod 4, and the shooting spring 3 is compressed from the head to the tail.

[0048] In the puncture state, after the shooting rod 2 is unlocked, the shooting spring 3 drives the blood collection needle 8 to move toward the head to complete the puncture.

[0049] In the needle unloading state, after pressing the tail handle 6 from the tail, the guide column 61 of the tail handle 6 acts on the rear end stop surface 45 on the needle unloading rod 4 to move the needle unloading rod 4 toward the head. At this time, the head of the firing spring 3 is limited by the firing limit surface 21 of the firing rod 2, and the firing spring 3 is compressed from the tail to the head until the needle unloading action surface 42 on the needle unloading rod 4 abuts against the tail of the blood collection needle 8, and the blood collection needle 8 is pushed out.

[0050] When the needle unloading is completed, after the pressure on the tail handle 6 is released, the needle unloading rod 4 and the tail handle 6 are driven by the launching spring 3 to move toward the tail to complete the reset.

[0051] Through the implementation of the above embodiments of the present invention, the firing spring 3 is used to simultaneously realize the puncture driving force of the shooting rod 2 and the reset driving force of the needle unloading rod 4, wherein the needle unloading rod 4 is arranged in the ejection cavity and parallel to the rod body of the shooting rod 2, and the firing spring 3 is simultaneously sleeved on the outer sides of the needle unloading rod 4 and the rod body of the shooting rod 2, and the needle unloading rod 4 is provided with a needle unloading action surface 42 acting on the tail of the blood collection needle 8, a pressing limit portion 43 for acting on the shooting rod 2, a reset limit surface 44 for abutting against and compressing the tail of the firing spring 3, and a rear end stop surface 45 located at the rear end and acting on the guide column 61 of the tail handle 6. In the loaded state, the shooting rod 2 is driven by the tail handle 6 to load toward the tail direction, and the shooting rod 2 is locked. At this time, the tail of the firing spring 3 is limited by the reset limit surface 44 of the needle unloading rod 4, and the firing spring 3 is ejected from the head to the tail. The end of the blood collection needle 8 is compressed; in the puncture state, after the shooting rod 2 is unlocked, the blood collection needle 8 is driven to move toward the head under the drive of the shooting spring 3 to complete the puncture; in the needle unloading state, after the tail handle 6 is pressed from the tail, the guide column 61 of the tail handle 6 acts on the rear end stop surface 45 on the needle unloading rod 4 to displace the needle unloading rod 4 toward the head. At this time, the head of the shooting spring 3 is limited by the shooting limit surface 21 of the shooting rod 2, and the shooting spring 3 is compressed from the tail to the head until the needle unloading action surface 42 on the needle unloading rod 4 abuts against the tail of the blood collection needle 8, and the pressing limit portion 43 of the needle unloading rod 4 is limited by the pressing limit surface 22 on the shooting rod 2, and the blood collection needle 8 is completely pushed out by the needle unloading rod 4; in the needle unloading state, after the pressure on the tail handle 6 is released, the needle unloading rod 4 is driven by the shooting spring 3 to move toward the tail to complete the reset.

[0052] In the above-mentioned loading state and puncture state, when loading, the tail handle 6 drives the shooting rod 2 toward the tail direction, and the firing spring 3 is compressed when loading. After the shooting rod 2 is unlocked, the blood collection needle 8 is driven to move toward the head to complete the puncture under the drive of the firing spring 3. It can be concluded that the puncture driving force on the shooting rod 2 is realized by the firing spring 3.

[0053] In the above-mentioned needle unloading state and the completed needle unloading state, when unloading the needle, the guide column 61 of the tail handle 6 acts on the rear end stop surface 45 on the needle unloading rod 4 to displace the needle unloading rod 4 toward the head, and compress the launching spring 3 from the tail to the head. After the pressure on the tail handle 6 is released, the needle unloading rod 4 is driven by the launching spring 3 to move toward the tail to complete the reset. It is concluded that the resetting driving force of the needle unloading rod 4 is realized by the launching spring 3.

[0054] The structural design of the above embodiments of the present invention is ingenious and reasonable. It makes full use of the multiple linkages between the needle unloading rod 4, the shooting rod 2, and the firing spring 3 located in the same ejection cavity to achieve the purpose of using one firing spring 3 to simultaneously realize the puncture driving force of the shooting rod 2 and the reset driving force of the needle unloading rod 4. Compared with the conventional blood collection pen with a needle unloading rod 4 and automatic reset of the needle unloading rod 4, fewer parts are used. Compared with the blood collection pen with relatively few parts, two fewer parts can be used. The spatial and structural linkages between the needle unloading rod 4 and the tail handle 6, and between the needle unloading rod 4 and the shooting rod 2 are fully utilized, the structure is optimized, the function is reliably and stably realized, the manufacturing cost can be greatly reduced, and the assembly process is less, the working hours are long, the manufacturing is simplified, and it makes a significant contribution to increasing the competitiveness of the product.

[0055] In another embodiment of the present invention, the unloading needle rod 4 is provided with a tail abutting portion 46 located at the tail for positioning against the housing 1 to limit the movement of the unloading needle rod 4 to the tail, and a needle unloading limiting portion 121 is provided on the housing 1 corresponding to the tail abutting portion 46. In the loaded state, the tail abutting portion 46 of the unloading needle rod 4 abuts against the unloading needle limiting portion 121 of the housing 1 to limit the movement of the unloading needle rod 4 to the tail, and at this time, the tail of the firing spring 3 is limited by the reset limiting surface 44 of the unloading needle rod 4, so that the firing spring 3 is compressed from the head to the tail. This structure is used to achieve the role of the housing 1 to abut against the unloading needle rod 4 and the unloading needle rod 4 to the shooting rod 2 in the loaded state, so that the process of compressing the firing spring 3 from the head to the tail is more reliable and stable, and the space linkage between the housing 1 and the unloading needle rod 4 and the space linkage between the shooting rod 2 and the unloading needle rod 4 are used to make the structure more compact and more stable.

[0056] In another embodiment, the compression stroke of the firing spring 3 from the head to the tail in the loaded state is smaller than the compression stroke of the firing spring 3 from the tail to the head in the needle unloading state, so that the needle unloading rod 4 can be quickly reset after the needle is unloaded, making the use rhythm of the lancing pen more reasonable.

[0057] In another embodiment, in the needle unloading state, the guide column 61 of the tail handle 6 acts on the rear end stop surface 45 on the needle unloading rod 4 to drive the shooting rod 2 and the needle unloading rod 4 to move toward the head for a distance, and then the shooting rod 2 is restricted by the shell 1 in its displacement toward the head, and the tail handle 6 continues to drive the needle unloading rod 4 to move toward the head, so that the needle unloading process has a sense of segmentation, and the structural design and spatial layout of the shooting rod and the needle unloading rod are more convenient, and easy to assemble and produce.

[0058] In another embodiment of the present invention, the length extension direction of the guide column 61 on the tail handle 6 is located on the axial center of the shell 1, and the corresponding rear end stop surface 45 on the needle unloading rod 4 is arranged at the axial center of the shell 1 and is perpendicular to the axial center of the shell 1, so that in the needle unloading state, the tail handle 6 is pressed from the tail and the guide column 61 on the tail handle 6 acts on the rear end stop surface 45 on the needle unloading rod 4. This makes the operation feel better, the fingers located in the center can exert force more evenly, and the force is more friendly to the needle unloading process, avoiding the feeling of sticking caused by uneven force.

[0059] In one embodiment of the present invention, the rear end stop surface 45 on the needle unloading rod 4 is provided with a column 47 for wrapping the guide column 61, the column 47 is extended toward the tail, and a guide inclined surface 471 is provided on the inner side of the tail of the column 47. This structure facilitates the positioning and cooperation between the guide column 61 of the tail handle 6 and the rear end stop surface 45 on the needle unloading rod 4, and also facilitates assembly and positioning.

[0060] In another embodiment of the present invention, the needle unloading rod 4 is provided with a pressing limit portion 43 for acting on the shooting rod 2, and the shooting rod 2 is provided with a pressing limit surface 22 for pressing the needle unloading rod 4 to the bottom. In the needle unloading state, when the pressing limit portion 43 of the needle unloading rod 4 is limited by the pressing limit surface 22 on the shooting rod 2, the blood collection needle 8 is completely pushed out by the needle unloading rod 4.

[0061] In one embodiment of the present invention, a sliding space 24 for the needle unloading rod 4 to slide is provided in the middle of the shooting rod 2, and the reset limit surface 44, the pressing limit portion 43, and the rear end stop surface 45 on the needle unloading rod 4 slide in the sliding space 24; a sliding track 25 for the needle unloading rod 4 to slide is provided in the middle of the shooting rod 2, and the needle unloading action surface 42 on the needle unloading rod 4 slides in the sliding track 25; with this more specific structure, a closer and more ingenious coordination relationship between the shooting rod and the needle unloading rod is achieved, and the layout of the ejection space in the shell is better utilized. The structure is compact, reasonable and ingenious, and it is also convenient for assembly between the shooting rod and the needle unloading rod.

[0062] Furthermore, the launch limit surface 21 and the pressing limit surface 22 on the shooting rod 2 are located between the sliding space 24 and the sliding track 25 on the shooting rod 2, and the launch limit surface 21 is located closer to the head relative to the pressing limit surface 22. In this way, the launch spring and the needle removal rod can be better coordinated, so that the launch spring can be tightly pressed against the launch limit surface when compressed from the head to the tail during loading, ensuring that the piercing driving force of the shooting rod is accumulated, and the needle removal rod can be pressed to the bottom in the needle removal state to have reliable abutment and positioning, avoiding excessive travel of the needle removal rod, and making the arrangement more reasonable.

[0063] In another embodiment of the present invention, Figures 2 to 4 As shown, the needle unloading rod 4 is L-shaped, including a first section 401 and a second section 402 that are perpendicular to each other, wherein the length extension direction of the first section 401 is parallel to the central axis of the shell 1, and the second section 402 is arranged at the axial center of the shell 1 and is perpendicular to the axial center of the shell 1. The needle unloading rod 4 with this shape structure can further better cooperate with the shooting rod 2, the shell 1 and the shooting spring 3, and can reasonably utilize the space occupation to avoid the overall volume being too large.

[0064] Specifically, the needle unloading action surface 42 on the needle unloading rod 4 is arranged on the first section 401, and the needle unloading action surface 42 is located on the inward side of the first section 401, so as to better realize that the needle unloading rod 4 is firmly positioned when the pen cap 5 is installed, and the needle unloading action surface 42 located on the first section 401 acts on the blood collection needle 8 located in the shooting rod 2 during unloading; the pressing limit part 43, the reset limit surface 44, and the rear end blocking surface 45 are located on the second section 402, and the pressing limit part 43 and the reset limit surface 44 are located on the side of the second section 402 facing the head, and the rear end blocking surface 45 is located on the side of the second section 402 facing the tail, so as to better realize the limiting of the shooting rod 2 in the loaded state, and in the needle unloading state, it is pushed by the guide column 61 of the tail handle 6 to limit the shooting spring 3 to compress the shooting spring 3, and the arrangement is reasonable.

[0065] In another embodiment of the present invention, Figure 29 to Figure 33 As shown, the needle unloading rod 4 is T-shaped and also includes a first section 401 and a second section 402 that are perpendicular to each other. The needle unloading action surface 42 is located at the front end of the first section 401. When unloading the needle, Fig.33 As shown, the needle removal action surface 42 at the front end of the first section 401 directly acts on the blood collection needle, and the blood collection needle has been removed.

[0066] In one embodiment of the present invention, the shell 1 is composed of an outer shell 11 and a middle sleeve 12. The main body of the middle sleeve 12 is a cylindrical structure. The middle sleeve 12 is fixedly connected to the inside of the shell 11. The front part of the shell 11 is detachably fixedly connected with a pen cap 5. The tail handle 6 is sleeved on the inner wall of the tail part of the shell 11, so that the various components can be better assembled in the shell 1.

[0067] Specifically, the needle unloading rod 4 is provided with a tail abutment portion 46 located at the tail for positioning and abutting against the middle sleeve 12 to limit the movement of the needle unloading rod 4 toward the tail, and a needle unloading limiting portion 121 is provided on the middle sleeve 12 corresponding to the tail abutment portion 46, so as to limit the movement of the needle unloading rod toward the tail in the loaded state, and then the needle unloading rod limits the loading of the shooting rod, which is more clever and reasonable.

[0068] In order to better understand the composition and function of each component in the present invention, the specific composition and use steps of the present invention will be described in detail in conjunction with a detailed embodiment below.

[0069] A blood collection device proposed in this detailed embodiment includes a housing 1, a shooting rod 2, a shooting spring 3, a needle removal rod 4, and a tail handle 6.

[0070] In this detailed embodiment, the structure of the housing 1 is referred to as Figure 1 As shown, the shell 1 is composed of an outer shell 11 and a middle sleeve 12. The main body of the middle sleeve 12 is a cylindrical structure. The middle sleeve 12 is fixedly connected to the inside of the outer shell 11. The front part of the outer shell 11 is detachably fixedly connected with a pen cap 5. The tail handle 6 is sleeved on the inner wall of the rear part of the outer shell 11. The tail handle 6 has a guide column 61 facing the front end.

[0071] In this detailed embodiment, the structure of the needle rod 4 is shown in FIG. Figure 2 , Figure 3 and Figure 4As shown, the needle unloading rod 4 is a needle unloading component on the blood collection needle 8 for pushing the blood collection needle 8, and the needle unloading rod 4 extends into the ejection chamber of the shell 1 and acts in the direction of pushing the blood collection needle 8; the needle unloading rod 4 is parallel to the rod body of the shooting rod 2 in the ejection chamber, and the firing spring 3 is simultaneously sleeved on the outer sides of the needle unloading rod 4 and the rod body of the shooting rod 2; the needle unloading rod 4 is provided with a needle unloading action surface 42 acting on the tail of the blood collection needle 8, a pressing limit portion 43 for acting on the shooting rod 2, a reset limit surface 44 for abutting and compressing the tail of the firing spring 3, and a rear end stop surface 45 located at the rear end and acting on the guide column 61 of the tail handle 6, and the needle unloading rod 4 is also provided with a tail abutment portion 46 located at the tail for positioning against the shell 1 to limit the movement of the needle unloading rod 4 toward the tail. Furthermore, the needle unloading rod 4 is L-shaped, comprising a first section 401 and a second section 402 which are perpendicular to each other, wherein the length extension direction of the first section 401 is parallel to the central axis of the shell 1, and the second section 402 is arranged at the axial center of the shell 1 and is perpendicular to the axial center of the shell 1, and the needle unloading action surface 42 on the needle unloading rod 4 is arranged on the first section 401, and the needle unloading action surface 42 is located on the inward side of the first section 401; the pressing limit portion 43, the reset limit surface 44, and the rear end stop surface 45 are located on the second section 402, and the pressing limit portion 43 and the reset limit surface 44 are located on the side of the second section 402 facing the head, and the rear end stop surface 45 is located on the side of the second section 402 facing the tail.

[0072] In this detailed embodiment, the structure of the shooting rod 2 is referred to as Figure 5 , Figure 6 and Figure 7 As shown, the shooting rod 2 is provided with a shooting limit surface 21 for abutting against and compressing the head of the shooting spring 3, and a pressing limit surface 22 for pressing the unloading needle rod 4 to the bottom. In addition, a sliding space 24 for the unloading needle rod 4 to slide is provided in the middle of the shooting rod 2, and the reset limit surface 44, the pressing limit part 43, and the rear end stop surface 45 on the unloading needle rod 4 slide in the sliding space 24; a sliding track 25 for the unloading needle rod 4 to slide is provided in the middle of the shooting rod 2, and the unloading needle action surface 42 on the unloading needle rod 4 slides in the sliding track 25. The shooting limit surface 21 and the pressing limit surface 22 on the shooting rod 2 are located between the sliding space 24 and the sliding track 25 on the shooting rod 2, and the position of the shooting limit surface 21 is close to the head relative to the position of the pressing limit surface 22.

[0073] In this detailed embodiment, the structure of the assembly of the shooting rod 2, the shooting spring 3, and the unloading needle rod 4 can be referred to Figure 8 , Fig. 9 , Fig.10As shown, the firing spring 3 is simultaneously sleeved on the outer sides of the needle unloading rod 4 and the shooting rod 2, the head of the firing spring 3 abuts against the firing limit surface 21 on the shooting rod 2, and the head of the firing spring 3 abuts against the reset limit surface 44 on the needle unloading rod 4, the head of the firing spring 3 is limited in position by the firing limit surface 21 of the shooting rod 2, and the tail of the firing spring 3 is limited in position by the reset limit surface 44 of the needle unloading rod 4, and the firing spring 3 provides the puncture driving force for the shooting rod 2 and the reset driving force for the needle unloading rod 4.

[0074] The lancing pen in this detailed embodiment is configured to have an initial state, a loading state, a puncture state, a puncture completion state, a needle removal state 01, a needle removal state 02, a needle removal state 03, and a needle removal completion state.

[0075] In the initial state, refer to Figure 11 to Figure 15 As shown, the tail of the needle unloading rod 4 abuts against the middle sleeve 12 (as shown in FIG. Fig.13 As shown in the enlarged schematic diagram of part I of FIG. 1 ), the needle unloading rod 4 is restricted from moving to the right, and the firing spring 3 is located between the firing rod 2 and the needle unloading rod 4 (as shown in FIG. Fig.14 (as shown in the enlarged schematic diagram of Part II).

[0076] In the loaded state, refer to Figure 15 to Figure 16 As shown, the blood collection needle 8 is inserted, driving the shooting rod 2 to move to the right. At this time, the tail of the needle removal rod 4 is restricted by the middle sleeve 12, and the reset limit surface 44 of the firing spring 3 on the needle removal rod 4 is relatively fixed, and the firing spring 3 is compressed (it can be understood that the right side of the firing spring 3 is fixed, and the spring is compressed from left to right) until the spring piece 23 at the top of the shooting rod 2 is locked by the middle sleeve 12.

[0077] In the puncture state, refer to Figure 17 to Figure 18 As shown, the firing button 7 is pressed (the arrow represents the pressing action), and the spring 23 on the top of the firing rod 2 is unlocked. Driven by the firing spring 3, the firing rod 2 moves to the left, driving the lancet needle to complete the puncture.

[0078] After the puncture is completed, refer to Figure 19 to Figure 20 As shown, after the puncture is completed, the position of the launching spring 3 is relatively balanced, so that the needle tip of the blood collection pen is placed in the pen cap 5.

[0079] In the needle removal state 01, refer to Figure 21 to Figure 22 As shown, the front end stopper surface 41 of the needle unloading rod 4 is released from constraint, and the tail handle 6 is pressed, and the guide column 61 in the tail handle 6 acts on the tail of the needle unloading rod 4, driving the shooting rod 2 to start moving to the left.

[0080] In the needle removal state 02, refer to Figure 23 to Figure 24As shown, continue to press the tail handle 6, at this time the tail of the shooting rod 2 is restricted, limiting the shooting rod 2 from moving to the left, continue to press the tail handle 6, the launching limit surface 21 of the launching spring 3 on the shooting rod 2 is relatively fixed, the launching spring 3 starts to compress from right to left, and the needle unloading action surface 42 on the needle unloading rod 4 presses against the tail of the blood collection needle 8.

[0081] In the needle removal state 03, refer to Figure 25 to Figure 27 As shown, continue to press the tail handle 6, at this time the unloading needle rod 4 is limited by the pressing limit surface 22 on the shooting rod 2 for pressing the unloading needle rod 4 to the bottom (as shown in FIG. Fig. 27 As shown in the enlarged schematic diagram of part III of the drawing, the tail handle 6 can no longer be pressed, the blood collection needle 8 is completely pushed out by the needle unloading rod 4, and the blood collection needle 8 is released from the constraint and can freely fall off the needle seat on the shooting rod 2.

[0082] After the needle is removed, refer to Fig.28 As shown, the tail handle 6 is released, and the firing spring 3 recovers its free length to the right, driving the needle unloading rod 4 to move to the right (while the tail handle 6 also moves to the right), until the tail of the needle unloading rod 4 is limited by the middle sleeve 12, and the firing spring 3 forms a relative balance relationship again.

[0083] Through the detailed description of the structures and use steps of the above embodiments and corresponding detailed embodiments, the present invention achieves the purpose of using one firing spring 3 to simultaneously realize the puncture driving force of the firing rod 2 and the reset driving force of the needle removal rod 4.

[0084] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A blood collection device, comprising a housing (1), a firing rod (2), a firing spring (3), a needle removal rod (4) and a tail handle (6), wherein: The shell (1) is a pen shell structure of a blood collection pen, and an ejection chamber is arranged in the shell (1); the ejection rod (2) is an ejection component with a head capable of inserting a blood collection needle (8), and the ejection rod (2) is located in the ejection chamber of the shell (1); a loading locking and unlocking structure is arranged between the ejection rod (2) and the shell (1); the ejection spring (3) is an elastic component on the blood collection pen used to provide an ejection force, and the ejection spring (3) acts in the ejection direction of the ejection rod (2); the needle removal rod (4) is a needle removal component on the blood collection pen used to push and remove the blood collection needle (8); the tail handle (6) is located at the tail of the shell (1) and is sleeved and matched with the shell (1); Features: The tail handle (6) has a guide post (61) facing the front end; The needle unloading rod (4) is located in the ejection chamber of the housing (1) and acts in the direction of pushing and unloading the blood collection needle (8); the needle unloading rod (4) is arranged in parallel with the rod body of the shooting rod (2) in the ejection chamber, and the firing spring (3) is sleeved on the rod body of the shooting rod (2); the needle unloading rod (4) is located outside or inside the firing spring (3); the needle unloading rod (4) is provided with a needle unloading action surface (42) acting on the tail of the blood collection needle (8), a reset limit surface (44) for abutting against and compressing the tail of the firing spring (3), and a rear end stop surface (45) located at the rear end and acting on the guide column (61) of the tail handle (6); The shooting rod (2) is provided with a shooting limit surface (21) for abutting against and compressing the head of the shooting spring (3); In the loaded state, the shooting rod (2) is loaded toward the tail and then locked, at which time the tail of the shooting spring (3) is limited by the reset limit surface (44) of the unloading needle rod (4), and the shooting spring (3) is compressed from the head to the tail; In the puncture state, after the shooting rod (2) is unlocked, the shooting spring (3) drives the blood collection needle (8) to move toward the head to complete the puncture; In the needle unloading state, after the tail handle (6) is pressed from the tail, the guide column (61) of the tail handle (6) acts on the rear end stop surface (45) on the needle unloading rod (4) to move the needle unloading rod (4) toward the head. At this time, the head of the firing spring (3) is limited by the firing limit surface (21) of the firing rod (2), and the firing spring (3) is compressed from the tail to the head until the needle unloading action surface (42) on the needle unloading rod (4) abuts against the tail of the blood collection needle (8), and the blood collection needle (8) is pushed out; When the needle unloading is completed, the pressure on the tail handle (6) is released, and the needle unloading rod (4) and the tail handle (6) are driven by the launching spring (3) to move toward the tail to complete the reset.

2. A blood collection device according to claim 1, characterized in that: The needle unloading rod (4) is provided with a tail abutting portion (46) at the tail for positioning against the shell (1) to limit the movement of the needle unloading rod (4) toward the tail. Corresponding to the tail abutting portion (46), a needle unloading limiting portion (121) is provided on the shell (1). In the loaded state, the tail abutting portion (46) of the needle unloading rod (4) abuts against the needle unloading limiting portion (121) of the shell (1) to limit the movement of the needle unloading rod (4) toward the tail. At this time, the tail of the firing spring (3) is limited by the reset limiting surface (44) of the needle unloading rod (4), so that the firing spring (3) is compressed from the head to the tail.

3. A blood collection device according to claim 1, characterized in that: The compression stroke of the firing spring (3) from the head to the tail in the loaded state is smaller than the compression stroke of the firing spring (3) from the tail to the head in the unloaded state.

4. A blood collection device according to claim 1 or 3, characterized in that: In the needle unloading state, the guide column (61) of the tail handle (6) acts on the rear end stop surface (45) on the needle unloading rod (4) to drive the shooting rod (2) and the needle unloading rod (4) to move toward the head for a certain distance. After that, the shooting rod (2) is restricted by the housing (1) from moving toward the head, and the tail handle (6) continues to drive the needle unloading rod (4) to move toward the head.

5. The blood collection device according to claim 1, characterized in that: The length extension direction of the guide column (61) on the tail handle (6) is located at the axial center of the shell (1), and the corresponding rear end stop surface (45) on the needle unloading rod (4) is arranged at the axial center of the shell (1) and is perpendicular to the axial center of the shell (1).

6. The blood collection device according to claim 1, characterized in that: The rear end stop surface (45) on the needle unloading rod (4) is provided with a column (47) for wrapping the guide column (61); the column (47) is extended toward the tail, and a guiding inclined surface (471) is provided on the inner side of the tail of the column (47).

7. The blood collection device according to claim 1, characterized in that: The needle unloading rod (4) is provided with a pressing limit portion (43) for acting on the shooting rod (2), and the shooting rod (2) is provided with a pressing limit surface (22) for pressing the needle unloading rod (4) to the bottom. In the needle unloading state, when the pressing limit portion (43) of the needle unloading rod (4) is limited by the pressing limit surface (22) on the shooting rod (2), the blood collection needle (8) is completely pushed out by the needle unloading rod (4).

8. The blood collection device according to claim 7, characterized in that: A sliding space (24) for the needle unloading rod (4) to slide is provided in the middle of the shooting rod (2), and the portion where the reset limit surface (44), the pressing limit portion (43) and the rear end stop surface (45) on the needle unloading rod (4) are located slides in the sliding space (24); a sliding track (25) for the needle unloading rod (4) to slide is provided in the middle of the shooting rod (2), and the portion where the needle unloading action surface (42) on the needle unloading rod (4) is located slides in the sliding track (25).

9. A blood collection device according to claim 8, characterized in that: The emission limiting surface (21) and the pressing limiting surface (22) on the shooting rod (2) are located between the sliding space (24) and the sliding track (25) on the shooting rod (2), and the position of the emission limiting surface (21) is closer to the head relative to the position of the pressing limiting surface (22).

10. The blood collection device according to claim 1, characterized in that: The needle removal rod (4) is L-shaped or T-shaped, and comprises a first section (401) and a second section (402) which are perpendicular to each other, wherein the length extension direction of the first section (401) is parallel to the central axis of the shell (1), and the second section (402) is arranged at the axial center of the shell (1) and is perpendicular to the central axis of the shell (1).

11. A blood collection device according to claim 10, characterized in that: The needle unloading action surface (42) on the needle unloading rod (4) is arranged on the first section (401); the reset limit surface (44) and the rear end stop surface (45) are located on the second section (402), the reset limit surface (44) is located on the side of the second section (402) facing the head, and the rear end stop surface (45) is located on the side of the second section (402) facing the tail.

12. The blood collection device according to claim 1, characterized in that: The housing (1) is composed of an outer shell (11) and a middle sleeve (12); the main body of the middle sleeve (12) is a cylindrical structure; the middle sleeve (12) is fixedly connected to the inside of the outer shell (11); a pen cap (5) is detachably 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).

13. A blood collection device according to claim 12, characterized in that: The needle unloading rod (4) is provided with a tail abutment portion (46) at the tail for positioning against the middle sleeve (12) to limit the movement of the needle unloading rod (4) toward the tail, and a needle unloading limiting portion (121) is provided on the middle sleeve (12) corresponding to the tail abutment portion (46).

Images