A continuous pushable blood sampling pen

Abstract

The application provides a continuous pushable blood sampling pen, and relates to the technical field of blood sampling pens. The blood sampling pen comprises a key structure, a transmission unit, a needle withdrawing structure and a depth adjusting assembly. The needle withdrawing structure is connected with the transmission unit, and the relative position relationship between the depth adjusting assembly and the transmission unit in a first direction has a first state and a second state. The first direction is a circumferential direction around a first axis. When the depth adjusting assembly and the transmission unit are in the first state, the pushing force of the key structure in the first direction acts on the transmission unit to push the blood sampling needle in the blood sampling needle fixing assembly in the direction of the first axis. When the depth adjusting assembly and the transmission unit are in the second state, the pushing force of the key structure in the first direction is prevented from acting on the transmission unit, so as to avoid the blood sampling needle in the blood sampling needle fixing assembly from being pushed out. The convenience of operation when the needle is withdrawn is ensured, and the problem of blood sampling needle failure caused by accidental operation of an operator during blood sampling is prevented.

Description

Technical Field

[0001] This application generally relates to the field of lancing device technology, and specifically to a continuously pushable lancing device. Background Technology

[0002] A lancing device is a medical device used in conjunction with a lancet to collect a small amount of blood from the fingertip or arm. With the rapid development of rapid diagnostic technologies, the application of small amounts of blood and the demand for lancing devices will become increasingly widespread, for example, in vitamin D testing.

[0003] Currently, in the field of painless negative pressure lancing devices, the sealing design of the internal sliding structure is quite challenging because a sealed structure is required to achieve skin adhesion for painless results. This leads to a common problem of inconvenient needle removal in existing products. Most existing painless negative pressure lancing devices cannot achieve convenient needle removal; the needle must be manually removed and discarded after use, which increases operational complexity and poses safety hazards. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a continuously pushable blood collection pen that is flexible in operation and supports unlimited blood collection attempts.

[0005] This application provides a continuously pushable blood collection pen, comprising: a button structure, a transmission unit, a needle retraction structure, and a depth adjustment component. The button structure, the transmission unit, the depth adjustment component, and the blood collection needle fixing component are arranged along a first axis. The needle retraction structure is connected to the transmission unit. The relative positional relationship between the depth adjustment component and the transmission unit in a first direction has a first state and a second state. The first direction is a circumferential direction surrounding the first axis.

[0006] When the depth adjustment component and the transmission unit are in the first state, the button structure is pressed, so that the end of the needle retraction structure abuts against the button structure, thereby allowing the pushing force of the button structure in the first direction to act on the transmission unit to push the blood collection needle in the blood collection needle fixing component out along the direction of the first axis.

[0007] When the depth adjustment component and the transmission unit are in the second state, pressing the button structure causes the end of the needle retraction structure to engage with the button structure in a non-abutting manner, thereby preventing the pushing force of the button structure in the first direction from acting on the transmission unit, so as to prevent the blood collection needle in the blood collection needle fixing component from being pushed out.

[0008] According to the technical solution provided in this application, the transmission unit includes an inner cylinder and a rotary positioning structure. The inner cylinder has a first mating surface, and the rotary positioning structure has a second mating surface. The first mating surface and the second mating surface are in sliding contact. The inner cylinder is connected to the needle retraction structure, and the two can rotate synchronously. An elastic element is sleeved on the inner cylinder and / or the rotary positioning structure.

[0009] The depth adjustment assembly has an adjustment cap, which abuts against the end of the rotary positioning structure away from the second mating surface;

[0010] When the adjusting cap is installed, the second mating surface presses against the first mating surface, causing the rotary positioning structure to rotate the needle retraction structure and torsion the elastic element to store energy, so that the depth adjustment assembly and the transmission unit are in the second state;

[0011] When the adjusting cap is removed, the rotary positioning structure and the needle retraction structure rotate in opposite directions and reset under the force of the elastic element, so that the depth adjustment component and the transmission unit are in the first state.

[0012] According to the technical solution provided in this application, the transmission unit includes an inner cylinder, and the outer wall of the inner cylinder is provided with an axially protruding locking block; the depth adjustment component includes an adjustment cap and a mounting base rotatably connected to the adjustment cap, the inner wall of the mounting base is provided with a locking groove slidably connected to the locking block, and the inner cylinder is connected to the needle retraction structure, and the two can rotate synchronously;

[0013] When the mounting base is installed and rotated, the locking block is inserted into the locking slot and rotates synchronously with the rotation of the locking slot, thereby driving the inner cylinder and the needle retraction structure to rotate, so that the depth adjustment component and the transmission unit are in the second state;

[0014] When the mounting base is disassembled, the mounting base is rotated in the opposite direction to make the slot drive the locking block to rotate synchronously, and the mounting base is removed. At the same time, the inner cylinder and the needle retraction structure rotate in the opposite direction so that the depth adjustment component and the transmission unit are in the first state.

[0015] According to the technical solution provided in this application, the button structure has push plates arranged at intervals along a first direction at one end near the transmission unit, and a cavity is formed between adjacent push plates.

[0016] When the depth adjustment component and the transmission unit are in the first state, pressing the button structure causes the end of the needle retraction structure to abut against the end face of the push plate;

[0017] When the depth adjustment component and the transmission unit are in the second state, pressing the button structure causes the end of the needle retraction structure to insert into the cavity.

[0018] According to the technical solution provided in this application, the button structure includes:

[0019] The button body has an outer wall that slides relative to the transmission unit. The button body has a push plate inside, and all the push plates are connected to each other so that they can be attracted and fixed to the upper connecting end of the blood collection needle fixing assembly.

[0020] According to the technical solution provided in this application, the needle removal structure includes:

[0021] A connector is slidably connected to the inner cylinder; one side of the connector is provided with two parallel guide rods, the free ends of which face the button structure; the other side of the connector is provided with a pusher, the axis of which is aligned with the axis of the blood collection needle; the pusher is slidably connected to the blood collection needle fixing assembly.

[0022] According to the technical solution provided in this application, the blood collection needle fixing assembly further includes: a guide shaft, the guide shaft having a hollow interior forming an inner cavity for installing the blood collection needle, the lower half of the guide shaft having symmetrically opened movable guide grooves on its sidewall, the connecting member being located inside the guide shaft and slidably connected to the movable guide grooves, and the pushing member being slidable along the guide shaft to push out the blood collection needle.

[0023] According to the technical solution provided in this application, the transmission unit further includes:

[0024] A fixed cylinder, wherein at least the inner cylinder and the pin retraction structure are installed inside the fixed cylinder; the inner wall of the fixed cylinder is slidably connected to the button structure; a through hole is provided on the side wall of the fixed cylinder; a reset ring is provided on the side of the fixed cylinder near the button structure; a button is installed on the side wall of the reset ring, and the button is located at the through hole;

[0025] A first spring is located between the fixed cylinder and the button structure. When the button is pressed, the button structure separates from the fixed cylinder, and the force of the first spring drives the button structure to reset.

[0026] According to the technical solution provided in this application, the depth adjustment component includes at least:

[0027] An adjustment structure is provided, which is connected to an adjustment cap. The adjustment structure has multiple positions arranged along its axial direction with progressively increasing heights. Both the adjustment structure and the adjustment cap have through holes for the blood collection needle to pass through.

[0028] When different gear positions correspond to the blood collection needle fixing assembly, the blood collection needle has different movable strokes.

[0029] According to the technical solution provided in this application, it further includes: a positioning component, wherein the positioning component is disposed between the inner cylinder and a structure that mates with the inner cylinder or between the mounting base and a structure that mates with the mounting base;

[0030] The positioning component has a cooperating protrusion and a positioning groove, the positioning groove having a first locking position and a second locking position;

[0031] When the protrusion engages with the first locking position of the positioning groove, the depth adjustment component and the transmission unit are in the first state;

[0032] When the protrusion engages with the second locking position of the positioning groove, the depth adjustment component and the transmission unit are in the second state.

[0033] As can be seen from the above technical solution, this application has at least the following beneficial effects:

[0034] This application provides a continuously pushable lancing device, including a button structure, a transmission unit, a needle retraction structure, and a depth adjustment component. The button structure, transmission unit, depth adjustment component, and lancing needle fixing component are arranged along a first axis. The needle retraction structure is connected to the transmission unit, and the relative positional relationship between the depth adjustment component and the transmission unit in a first direction has a first state and a second state. The first direction is a circumferential direction around the first axis. When the depth adjustment component and the transmission unit are in the first state, pressing the button structure causes the end of the needle retraction structure to abut against the button structure, thereby allowing the pushing force of the button structure in the first direction to act on the transmission unit to push the lancing needle in the lancing needle fixing component out along the first axis. When the depth adjustment component and the transmission unit are in the second state, pressing the button structure causes the end of the needle retraction structure to be in a non-abutting fit with the button structure, thereby preventing the pushing force of the button structure in the first direction from acting on the transmission unit, thus preventing the lancing needle in the lancing needle fixing component from being pushed out.

[0035] This application arranges the button structure, transmission unit, depth adjustment component, and blood collection needle fixing component along a first axis, and designs a first state and a second state for the depth adjustment component and transmission unit in the circumferential direction around the first axis. This achieves precise switching of the pushing force between the two states. In the first state, pressing the button structure causes the needle retraction structure to abut against the button structure, allowing the pushing force of the button structure to push the blood collection needle out along the first axis through the transmission unit, meeting the needle retraction requirement. In the second state, pressing the button structure results in a non-abutting engagement between the needle retraction structure and the button structure, preventing the pushing force of the button structure from acting on the transmission unit and avoiding accidental needle retraction, thus adapting to the blood collection cycle operation. This structural design can precisely control the retraction and non-retraction states of the blood collection needle, ensuring ease of operation during needle retraction and preventing needle failure due to accidental actions by the operator during blood collection. It effectively improves the flexibility, reliability, and safety of the blood collection pen, while laying the foundation for subsequent continuous blood collection, reducing operational complexity and needle waste, and better meeting the needs for precise control and efficient operation of the device in medical blood collection scenarios. Attached Figure Description

[0036] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0037] Figure 1 This is a first cross-sectional view of an embodiment of a continuously pushable blood collection pen.

[0038] Figure 2 This is a second cross-sectional view of Embodiment 1 of a continuously pushable blood collection pen.

[0039] Figure 3 This is an overall structural diagram of Example 1.

[0040] Figure 4 This is a schematic diagram of the button structure.

[0041] Figure 5 This is a schematic diagram of the guide cylinder and guide groove.

[0042] Figure 6 This is a structural diagram of the rotary positioning structure and the inner cylinder of Example 1.

[0043] Figure 7 This is an overall structural diagram of the depth adjustment component in Embodiment 1.

[0044] Figure 8 This is a structural diagram of the fixed cylinder.

[0045] Figure 9 This is a schematic diagram of Embodiment 2 of a continuously pushable blood collection pen.

[0046] Figure 10 This is an overall structural diagram of the depth adjustment component in Embodiment 2.

[0047] Figure 11 This is a structural diagram of the card block and card slot.

[0048] Figure 12 This is an assembly diagram of the depth adjustment component and the inner cylinder in Embodiment 2.

[0049] Figure 13 This is a structural diagram of the adjustment cap of the depth adjustment component in Embodiment 2.

[0050] Figure 14 This is a structural diagram of the first and second bosses.

[0051] The diagram shows the following components: 1. Fixed cylinder; 2. Button structure; 3. Inner cylinder; 4. Blood collection needle fixing assembly; 5. Rotary positioning structure; 6. Depth adjustment assembly; 7. Blood collection needle; 8. Push plate; 9. Needle retraction structure; 10. Connecting piece; 11. Guide rod; 12. Pushing piece; 13. Guide shaft; 14. Upper connecting end; 15. Guide cylinder; 16. Guide groove; 17. Button body; 18. Cavity; 19. Third spring; 20. First spring; 21. Second spring; 22. Elastic element; 23. Button; 24. Reset ring; 25. Locking block; 26. Adjustment structure; 27. Locking groove; 28. Adsorption magnet; 29. ​​Adjustment cap; 30. Mounting base; 31. First boss; 32. Second boss; 33. Fourth spring. Detailed Implementation

[0052] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0053] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0054] Example 1

[0055] like Figure 1 , Figure 2 and Figure 3 As shown, this application provides a continuously pushable blood collection pen, including: a button structure 2, a transmission unit, a needle retraction structure 9, and a depth adjustment component 6. The button structure 2, the transmission unit, the depth adjustment component, and the blood collection needle fixing component 4 are arranged along a first axis. The needle retraction structure 9 is connected to the transmission unit, and the relative positional relationship between the depth adjustment component 6 and the transmission unit in the first direction has a first state and a second state. The first direction is a circumferential direction around the first axis.

[0056] When the depth adjustment component 6 and the transmission unit are in the first state, the button structure 2 is pressed, so that the end of the needle retraction structure 9 abuts against the button structure 2, thereby allowing the pushing force of the button structure 2 in the first direction to act on the transmission unit to push the blood collection needle 7 in the blood collection needle fixing component 4 out along the direction of the first axis.

[0057] When the depth adjustment component 6 and the transmission unit are in the second state, the button structure 2 is pressed, so that the end of the needle retraction structure 9 is in non-abutting engagement with the button structure 2, thereby preventing the pushing force of the button structure 2 in the first direction from acting on the transmission unit, so as to prevent the blood collection needle 7 in the blood collection needle fixing component 4 from being pushed out.

[0058] Among them, such as Figure 1 As shown, the first axis is, for example, the central axis of the button structure 2. In the first state, the button structure 2 and the transmission unit are matched in the relative position in the first direction. At this time, a pushing force along the first direction is applied to the button structure 2, causing the end of the needle retraction structure 9 to abut against the button structure 2. This pushing force is then transmitted through the transmission unit and ultimately converted into a force along the first axis, thereby pushing the blood collection needle 7 in the blood collection needle fixing assembly 4 out along the axial direction to achieve the ejection action of the blood collection needle 7. In the second state, the button structure 2 and the transmission unit are misaligned in the first direction. At this time, even if a pushing force along the first direction is applied to the button structure 2, the end of the needle retraction structure 9 and the button structure 2 are not in contact, and the pushing force cannot act on the transmission unit. Therefore, it will not trigger the action of the blood collection needle fixing assembly 4, thus preventing the blood collection needle 7 from being accidentally ejected and ensuring safety during blood collection or in non-operational states. By designing two relative states between the depth adjustment component 6 and the transmission unit in the first direction, as well as the relative states between the needle retraction structure 9 and the button structure 2, precise switching of the blood collection needle 7 ejection action is achieved. This allows the blood collection needle to be reliably ejected by operating the button when needed, while avoiding accidental triggering when no action is required, thus improving the stability and safety of the blood collection pen.

[0059] Furthermore, the transmission unit includes an inner cylinder 3 and a rotary positioning structure 5. The inner cylinder 3 has a first mating surface, and the rotary positioning structure 5 has a second mating surface. The first mating surface and the second mating surface are in sliding contact. The inner cylinder 3 is connected to the needle retraction structure 9, and the two can rotate synchronously. An elastic element 22 is sleeved on the inner cylinder 3 and / or the rotary positioning structure 5.

[0060] The depth adjustment assembly 6 has an adjustment cap 29, which abuts against the end of the rotary positioning structure 5 away from the second mating surface;

[0061] When the adjusting cap 29 is installed, the second mating surface presses against the first mating surface, driving the rotary positioning structure 5 to rotate the needle retraction structure 9 and torturing the elastic element 22 to store energy, so that the depth adjustment assembly 6 and the transmission unit are in the second state.

[0062] When the adjusting cap 29 is removed, the rotating positioning structure 5 and the needle retraction structure 9 rotate in the opposite direction and reset under the force of the elastic element 22, so that the depth adjusting component 6 and the transmission unit are in the first state.

[0063] The inner cylinder 3 rotates relative to the fixed cylinder 1 of the transmission unit. The end of the inner cylinder 3 closest to the depth adjustment component 6 has a first mating surface, which is the forced surface of the inner cylinder 3. The rotary positioning structure 5 is axially movable, and the end of the rotary positioning structure 5 furthest from the depth adjustment component 6 has a second mating surface that mates with the first mating surface. The second mating surface is the force-applying surface of the rotary positioning structure 5. Both the first and second mating surfaces are helical surfaces, facilitating more stable force transmission between the two surfaces. The second mating surface is the driving surface of the rotary positioning structure 5; that is, when the rotary positioning structure 5 moves axially, the driving force of this axial movement can be transmitted to the first mating surface through the second mating surface, thereby driving the inner cylinder 3 to rotate. Furthermore, the inner cylinder 3 and the needle retraction structure 9 have the function of both synchronous rotation and relative sliding along the axial direction. For example, a slide rail is opened on the inner wall of the inner cylinder 3, with the extension direction of the slide rail parallel to the axis of the inner cylinder 3. The needle retraction structure 9 is slidably connected to the slide rail, which can limit the radial position of the needle retraction structure 9 without affecting its axial movement. Figure 6 As shown, an elastic element 22 is fitted on the inner cylinder 3, with one end of the elastic element 22 connected to the side wall of the inner cylinder 3 away from the blood collection needle 7, and the other end connected to the inner wall of the fixed cylinder 1 of the transmission unit; or, the elastic element 22 can be set between the rotary positioning structure 5 and the inner cylinder 3, with one end connected to the side wall of the rotary positioning structure 5 and the other end connected to the side wall of the inner cylinder 3; or, the elastic element 22 can be set on the rotary positioning structure 5, with one end connected to the side wall of the rotary positioning structure 5 and the other end connected to the inner wall of the fixed cylinder 1 of the transmission unit; here, there are no restrictions on the specific installation position and connection relationship of the elastic element 22, as long as the elastic element 22 can generate a deformation force with the rotation of the adjusting cap 29 and finally allow the inner cylinder 3 to return to its original position.

[0064] When the adjusting cap 29 is installed along the first axis, the adjusting cap 29 pushes the rotary positioning structure 5 to move axially, causing the second mating surface to slide along the first mating surface and press against the first mating surface. The engagement of the first and second mating surfaces transmits the axial pushing force of the rotary positioning structure 5 to the inner cylinder 3, causing the inner cylinder 3 and the needle withdrawal structure 9 to rotate synchronously. At the same time, the elastic element 22 twists accordingly, storing energy. At this time, the depth adjustment assembly 6 and the transmission unit are in the second state, enabling blood collection circulation. When the adjusting cap 29 is removed, the inner cylinder 3 rotates in the opposite direction under the restoring torque of the elastic element 22, and drives the needle withdrawal structure 9 to rotate in the opposite direction and reset synchronously. At this time, the depth adjustment assembly 6 and the transmission unit are in the first state, enabling needle withdrawal. The elastic element 22 is, for example, a torsion spring, a sheet spring, or other deformable and resettable component.

[0065] Furthermore, push plates 8 are arranged at intervals along the first direction at one end of the button structure 2 near the transmission unit, and a cavity 18 is formed between adjacent push plates 8.

[0066] When the depth adjustment component 6 and the transmission unit are in the first state, pressing the button structure 2 causes the end of the needle retraction structure 9 to abut against the end face of the push plate 8.

[0067] When the depth adjustment component 6 and the transmission unit are in the second state, pressing the button structure 2 causes the end of the needle retraction structure 9 to be inserted into the cavity 18.

[0068] In the first state, when the depth adjustment component 6 and the transmission unit are in the same state, pressing the button structure 2 allows the end of the needle retraction structure 9 to abut against the end face of the push plate 8, i.e., the needle retraction structure 9 is aligned with the push plate 8. At this time, if the button structure 2 moves along the first direction, the push plate 8 will abut against the needle retraction structure 9 and transmit force to the transmission unit, causing the transmission unit to move accordingly, ultimately driving the blood collection needle fixing component 4 to push out the blood collection needle 7 along the first axis. When the depth adjustment component 6 and the transmission unit are in the second state, pressing the button structure 2 allows the end of the needle retraction structure 9 to be inserted into the cavity 18, i.e., the needle retraction structure 9 is aligned with the space between the push plates 8. At this time, even if the button structure 2 moves along the first direction, the movement trajectory of the push plate 8 and the position of the needle retraction structure 9 are offset, and there is no direct contact between the two. Force cannot be transmitted to the transmission unit, thus preventing the blood collection needle 7 from being accidentally pushed out. The push plate 8 and cavity 18 are arranged at intervals. By switching between the two physical states of contact and insertion with the needle retraction structure 9, the power transmission and power cut-off of the button structure 2 to the transmission unit are realized, so as to ensure that the device can accurately control the blood collection needle ejection action.

[0069] Furthermore, such as Figure 4 As shown, button structure 2 includes:

[0070] The button body 17 has an outer wall that is slidably connected to the transmission unit. The button body 17 has a push plate 8 inside. All the push plates 8 are connected to each other and can be attracted and fixed to the upper connection end 14 of the blood collection needle fixing assembly 4.

[0071] For example, suction blocks with adsorption capabilities can be designed at all the connection points of the push plates 8 and at the upper connection end 14, so that the button body 17 can be adsorbed and fixed to the upper connection end 14 of the blood collection needle fixing assembly 4. The suction blocks are, for example, magnetic magnets 28. Here, the button body 17 can be formed by injection molding.

[0072] Furthermore, such as Figure 2 As shown, the needle retraction structure 9 includes:

[0073] Connector 10 is slidably connected to inner cylinder 3; two parallel guide rods 11 are provided on one side of connector 10, with the free end of guide rod 11 facing button structure 2; pusher 12 is provided on the other side of connector 10, with the axis of pusher 12 aligned with the axis of blood collection needle 7; pusher 12 is slidably connected to blood collection needle fixing assembly 4.

[0074] Among them, the connector 10 serves as the connecting carrier between the guide rod 11 and the pusher 12. Through the sliding connection between the connector 10 and the inner cylinder 3, it ensures that the entire needle withdrawal structure 9 can move stably along the axial trajectory of the blood collection needle 7, avoiding deviation that could lead to needle withdrawal failure.

[0075] Two parallel guide rods 11 are fixed to the side of the connector 10 facing the button structure 2. This double-rod configuration balances the force, preventing the connector 10 from tilting due to unilateral force and ensuring stable power transmission during needle withdrawal. The guide rods 11 bear the pressing force of the button structure 2 but do not directly participate in the needle withdrawal operation. The axis of the pusher 12 is aligned with the axis of the blood collection needle 7 to ensure that the pusher 12 accurately abuts against the tail of the blood collection needle 7, avoiding misalignment that could cause the blood collection needle 7 to be misaligned or deviated. The pusher 12 is slidably connected to the blood collection needle fixing assembly 4. The sliding connection can be, for example, by having a hollow interior for the pusher 12, which fits onto the blood collection needle fixing assembly 4, or by having an inner cavity in the blood collection needle fixing assembly 4, into which the pusher 12 is inserted.

[0076] Taking the blood collection needle fixing assembly 4 having an inner cavity and the pusher 12 inserted into the inner cavity as an example, when the depth adjustment assembly 6 and the transmission unit are in the first state, the end of the guide rod 11 corresponds to the push plate 8 in the button structure 2. At this time, the button structure 2 is set relatively far away from the guide rod 11. Only when the user presses the button structure 2 will the push plate 8 abut against the guide rod 11 and transmit the downward pressing force to the connector 10 through the guide rod 11, driving the connector 10 to move down along the guide groove 16 of the inner cylinder 3. The pusher 12 moves down accordingly and extends into the tail of the blood collection needle 7 along the inner cavity of the blood collection needle fixing assembly 4. By continuously applying the pushing force, the blood collection needle 7 is pushed out of the blood collection needle fixing assembly 4 and falls down, completing the needle withdrawal operation.

[0077] Specifically, such as Figure 1 and Figure 2 As shown, the blood collection needle fixing assembly 4 includes:

[0078] The guide shaft 13 is hollow inside to form the inner cavity of the blood collection needle fixing assembly 4; the lower half of the guide shaft 13 has symmetrical movable guide grooves on its side wall; the connector 10 is located inside the guide shaft 13 and is slidably connected to the movable guide groove; the pusher 12 can slide along the inner cavity of the guide shaft 13 to push out the blood collection needle 7.

[0079] Here, the inner cavity of the blood collection needle fixing assembly 4 formed by the hollow inside of the guide shaft 13 is the installation space for the blood collection needle 7. The slight elasticity or friction of the inner wall of the guide shaft 13 can be used to fix the blood collection needle 7, ensuring that the blood collection needle 7 does not loosen or fall off during the engagement and firing process, and avoiding deviation of the needle position due to displacement of the blood collection needle.

[0080] The lower half of the guide shaft 13 has symmetrical movable guide grooves on its side wall. The movable guide grooves are used to enable the needle retraction structure 9 and the blood collection needle fixing assembly 4 to work together. Here, the length of the movable guide groove needs to match the needle retraction stroke, that is, the distance that the pusher 12 needs to move from the initial position to the ejection of the blood collection needle 7. The cross-section of the movable guide groove is fan-shaped. When the first state and the second state are switched, the connector 10 can swing with the swing of the inner cylinder 3. That is, the connector 10 can slide along the fan-shaped movable guide groove. The movable guide groove not only restricts the connector 10 to move only along the axis of the blood collection needle 7 to prevent lateral deviation, but also provides sliding support for the connector 10 to prevent it from shaking when it drives the pusher 12 to retract the needle.

[0081] Furthermore, such as Figure 8 As shown, the transmission unit also includes: a fixed cylinder 1, which has at least an inner cylinder 3 and a needle retraction structure 9 installed inside it; the inner wall of the fixed cylinder 1 is slidably connected to the button structure 2; a through hole is provided on the side wall of the fixed cylinder 1; a reset ring 24 is provided on the side of the fixed cylinder 1 near the button structure 2; a button 23 is installed on the side wall of the reset ring 24; and the button 23 is located at the through hole.

[0082] The first spring 20 is located between the fixed cylinder 1 and the button structure 2. When the button 23 is pressed, the button structure 2 and the fixed cylinder 1 separate, and at the same time, the force of the first spring 20 drives the button structure 2 to reset.

[0083] It should be noted that the fixing cylinder 1 is used to install the inner cylinder 3, the rotary positioning structure 5, the needle retraction structure 9, and the depth adjustment component 6. The inner cylinder 3 is nested inside the fixing cylinder 1. The inner cylinder 3 serves as the mounting carrier for the blood collection needle fixing component 4 and the needle retraction structure 9, constraining the movement trajectory of the needle retraction structure 9 and fixing the position of the rotary positioning structure 5. The blood collection needle fixing component 4 is used to install and fix the blood collection needle 7.

[0084] A movable reset ring 24 is installed at one end of the fixed cylinder 1 near the button structure 2. A through hole is opened on the side wall of the fixed cylinder 1. The button 23 is installed on the side wall of the reset ring 24 and is exposed through the through hole of the side wall of the fixed cylinder 1. A locking structure is provided between the reset ring 24 and the button structure 2, which can engage with each other. The locking structure is, for example, an inner protrusion on the edge of the reset ring 24 and a shoulder on the button structure 2. When the button structure 2 moves toward the side closer to the transmission unit, when it reaches a certain position, the inner protrusion and the shoulder on the edge of the reset ring 24 engage, thereby locking the current position of the button structure 2. At this time, the blood collection pen is in the geared state.

[0085] The first spring 20 is disposed between the fixed cylinder 1 and the button structure 2. When the button structure 2 is pressed down, the first spring 20 is compressed, and the locking structure keeps the button structure 2 in the compressed position. When the button 23 is pressed, it drives the reset ring 24 to move, causing the locking structure to disengage. Under the force of the first spring 20, the button structure 2 can slide upward along the inner wall of the fixed cylinder 1 and reset.

[0086] Furthermore, a sealing ring is provided at the sliding connection between the fixed cylinder 1 and the button structure 2, which provides a sealing basis for negative pressure adsorption during blood collection, ensuring that the skin at the front end can be stably adsorbed, and achieving a painless blood collection effect.

[0087] Furthermore, such as Figure 5 As shown, a guide cylinder 15 is coaxially fixed on the top wall of the inner cylinder 3, and guide grooves 16 are symmetrically opened on the guide cylinder 15. The connector 10 is inserted into the guide groove 16.

[0088] The guide cylinder 15 is coaxially fixed to the top wall of the inner cylinder 3 to prevent the connector 10 from causing the pusher 12 to deviate from the axis of the blood collection needle 7 due to the deviation of the guide reference, thus ensuring the accuracy of needle withdrawal from the source. Here, the guide cylinder 15 is a cylindrical protruding structure, and its length needs to match the sliding stroke of the connector 10, that is, the distance that the connector 10 needs to move when withdrawing the needle. It not only provides longitudinal support for the connector 10 to prevent the connector 10 from swaying up and down during the sliding process, but also wraps a part of the connector 10 through the cylindrical structure, so as to play a positioning and guiding role when the blood collection needle fixing assembly 4 moves.

[0089] like Figure 6 and Figure 7 As shown, the depth adjustment component 6 includes at least:

[0090] Adjustment structure 26 is connected to adjustment cap 29. Adjustment structure 26 has multiple positions arranged along its axis with progressively increasing height. Both adjustment structure 26 and adjustment cap 29 have through holes for blood collection needle 7 to pass through.

[0091] When different gear positions come into contact with the blood collection needle fixing component 4, the blood collection needle 7 has different movable strokes.

[0092] The adjusting structure 26 is used to change its relative position with the blood collection needle fixing assembly 4 by rotating relative to the inner cylinder 3, thereby adjusting the needle insertion depth of the blood collection needle 7. The through hole of the adjusting structure 26 is coaxially arranged with the blood collection needle 7, and the hole diameter is slightly larger than the diameter of the blood collection needle 7, ensuring that the blood collection needle 7 can pass smoothly during the blood collection operation.

[0093] The adjusting cap 29 is the direct operating component for users to adjust the depth. The adjusting cap 29 is connected to the adjusting structure 26. Each rotation of a certain angle can change the adjusting structure 26 to change one gear. In addition, the outer wall of the adjusting cap 29 can be provided with anti-slip texture, such as stripes or granular protrusions, to improve the user's operating experience.

[0094] The specific process of adjusting the needle depth of the depth adjustment component 6 is as follows:

[0095] Rotating the adjusting cap 29 causes the adjusting structure 26 to rotate, so that different positions of the adjusting structure 26 correspond to the ribs on both sides of the guide shaft 13 of the blood collection needle fixing assembly 4, thereby changing the distance between them. When the distance decreases, the length of the blood collection needle 7 that extends when fired is shortened, and the needle exits shallower; when the distance increases, the length of the blood collection needle 7 that extends increases, and the needle exits deeper, thus adapting to different skin thicknesses or blood collection needs of different people.

[0096] Furthermore, this lancing device also includes: a second spring 21, which is located within the gap formed between the inner cylinder 3 and the guide shaft 13, and is sleeved on the guide shaft 13; one end of the second spring 21 is connected to the end of the guide shaft 13 away from the lancing needle 7. When the first spring 20 drives the button structure 2 to reset, since all the push plates 8 of the button structure 2 are connected to the upper connecting end 14 of the lancing needle fixing assembly 4, the button structure 2 can pull the lancing needle fixing assembly 4 to move together during the reset process, compressing the second spring 21 and storing energy, such as... Figure 14 As shown, when the first boss 31 on the guide shaft 13 of the blood collection needle fixing assembly 4 and the second boss 32 on the inner cylinder 3 come into contact, the positions where all the push plates 8 of the button structure 2 are connected are separated from the upper connecting end 14 of the blood collection needle fixing assembly 4. The second spring 21 releases energy, thereby pushing the blood collection needle fixing assembly 4 to move and push out the blood collection needle 7. When the ribs on both sides of the guide shaft 13 of the blood collection needle fixing assembly 4 hit the corresponding positions in the adjusting cap 29, the blood collection needle 7 stops being pushed out. Then, under the action of the third spring 19 (located between the inner cylinder 3 and the blood collection needle fixing assembly 4), the blood collection needle 7 is pulled back.

[0097] Furthermore, sealing rings are provided at locations where gaps may exist, such as between the depth adjustment component 6 and the fixed cylinder 1, between the fixed cylinder 1 and the button structure 2, and between the fixed cylinder 1 and the button 23, to ensure the airtightness of this blood collection pen. Only one air port is retained at the needle outlet, so that the needle outlet can adhere to the skin surface during blood collection, forming a negative pressure blood collection effect.

[0098] Example 2

[0099] like Figure 9 , Figure 10 , Figure 11 , Figure 12 and Figure 13 As shown, based on the above embodiments, this embodiment is designed as follows: the transmission unit includes an inner cylinder 3, and the outer wall of the inner cylinder 3 is provided with an axially protruding locking block 25; the depth adjustment component 6 includes an adjustment cap 29 and a mounting base 30 rotatably connected to the adjustment cap 29, the inner wall of the mounting base 30 is provided with a locking groove 27 slidably connected to the locking block 25, the inner cylinder 3 is connected to the needle retraction structure 9, and the two can rotate synchronously; a sealing ring is also provided at the connection position between the mounting base 30 and the adjustment cap 29 to ensure the sealing of this blood collection pen and achieve the purpose of negative pressure blood collection;

[0100] When the mounting base 30 is installed and rotated, the locking block 25 is inserted into the locking slot 27 and rotates synchronously with the rotation of the locking slot 27, thereby driving the inner cylinder 3 and the needle retraction structure 9 to rotate, so that the depth adjustment component 6 and the transmission unit are in the second state.

[0101] When the mounting base 30 is disassembled, the mounting base 30 is rotated in the opposite direction to make the slot 27 drive the block 25 to rotate synchronously. The mounting base 30 is then removed. At the same time, the inner cylinder 3 and the needle retraction structure 9 rotate in the opposite direction so that the depth adjustment component 6 and the transmission unit are in the first state.

[0102] Furthermore, it also includes: a positioning component, which is disposed between the inner cylinder 3 and the structure that mates with the inner cylinder 3 or between the mounting base 30 and the structure that mates with the mounting base 30;

[0103] The positioning component has a cooperating protrusion and a positioning groove, the positioning groove having a first locking position and a second locking position;

[0104] When the protrusion engages with the first locking position of the positioning groove, the depth adjustment component 6 and the transmission unit are in the first state;

[0105] When the protrusion engages with the second locking position of the positioning groove, the depth adjustment component 6 and the transmission unit are in the second state.

[0106] It should be noted that the transmission unit includes an inner cylinder 3 and a needle retraction structure 9 that is embedded and rotates synchronously with it. The outer wall of the inner cylinder 3 has an axially protruding locking block 25. The inner wall of the mounting base 30 has a curved locking groove 27; as... Figure 12 and Figure 13 As shown, the positioning component is disposed, for example, between the inner cylinder 3 and the mounting base 30, with a protrusion disposed on the inner cylinder 3 and a positioning groove disposed on the mounting base 30.

[0107] During assembly, rotating the adjusting cap 29 causes the slot 27 to rotate, which in turn rotates the locking block 25, causing the inner cylinder 3 and the needle retraction structure 9 to rotate by a certain angle. Simultaneously, the protrusion engages in the first locking position of the positioning groove, thus achieving the first state. During disassembly, rotating the adjusting cap 29 in the opposite direction causes the locking block 25 to rotate in the opposite direction along with the slot 27, causing the inner cylinder 3 and the needle retraction structure 9 to rotate synchronously. This allows the protrusion to engage in the second locking position of the positioning groove, at which point the adjusting cap 29 can be removed, achieving the second state. This solution achieves rotational drive and mechanical synchronous reset functions through the synchronous rotation of the slot 27 and the locking block 25, and the different engagement states of the protrusion and the positioning groove. The remaining functions and advantages are the same as in the above embodiment and will not be repeated here.

[0108] Furthermore, such as Figure 5 As shown, a guide cylinder 15 is coaxially fixed on the top wall of the inner cylinder 3, and guide grooves 16 are symmetrically opened on the guide cylinder 15. The connector 10 is inserted into the guide groove 16.

[0109] Here, the position and function of the guide cylinder 15 are the same as those in Embodiment 1, and will not be described again.

[0110] The guide groove 16 is symmetrically opened on the guide cylinder 15. The edge of the connector 10 is inserted into the symmetrical guide groove 16. When sliding, the force on both sides is consistent, avoiding the connector 10 from tilting or getting stuck due to the force on one side. Especially when the needle is withdrawn, the pusher 12 needs to apply a stable push force to the blood collection needle 7. The symmetrical guide can ensure that the push force is transmitted along the axis without any lateral component.

[0111] The aforementioned connector 10 is slidably connected to both the guide groove 16 of the inner cylinder 3 and the movable guide groove of the guide shaft 13. Both the guide groove 16 of the inner cylinder 3 and the movable guide groove of the guide shaft 13 provide guiding constraints, forming a dual guiding system. This ensures that the connector 10 drives the pusher 12 to always move along the axis of the blood collection needle 7, preventing the pusher 12 from being pushed off-center or deviating from the blood collection needle 7 due to offset. Here, the width of the movable guide groove of the guide shaft 13 is greater than the width of the guide groove 16, providing sufficient rotatable space for the connector 10 when switching between the first and second states.

[0112] Taking the structure shown in Embodiment 1 as an example, the specific operation process of this continuously pushable blood collection pen during use is as follows:

[0113] (I) Assembly and Depth Adjustment Stage:

[0114] Remove the depth adjustment component 6 and release its engagement with the rotation positioning structure 5 to expose the bottom opening of the guide shaft 13 of the blood collection needle fixing component 4; take out the blood collection needle 7, align its tail with the hollow inner cavity of the guide shaft 13 and gently insert it until the guide shaft 13 and the blood collection needle 7 fit tightly to ensure that the blood collection needle 7 is stably installed, then twist off the plastic at the front end of the blood collection needle 7 and remove this section of plastic to expose the needle tip, then align the adjusting cap 29 with the bottom of the inner cylinder 3 and push it in axially to form a stable connection between the two. At this time, the depth adjustment component 6 and the inner cylinder 3 are coaxial, and the through hole of the adjusting structure 26 is aligned with the axis of the blood collection needle 7.

[0115] (II) Blood Collection and Circulation Mode Stage:

[0116] Hold the fixing cylinder 1, and place the bottom of the adjusting cap 29 of the depth adjustment component 6 against the blood collection site, keeping the lancing pen perpendicular to the skin. Press down on the button body 17 with your thumb, causing the button structure 2 to move downwards, so that the button structure 2 and the upper connecting end 14 of the lancing needle fixing component 4 are attracted together, keeping the lancing pen in contact with the skin. Press the button 23, and the reset ring 24 moves, separating the button structure 2 from the fixing cylinder 1. Here, the first spring 20 drives the button structure 2 to reset. Since all the push plates 8 of the button structure 2 are connected to the upper connecting end 14 of the lancing needle fixing component 4, the lancing needle fixing component 4 can be pulled along during the reset process of the button structure 2, compressing the second spring 21 to store energy. When the guide of the lancing needle fixing component 4... When the first protrusion 31 on shaft 13 and the second protrusion 32 on inner cylinder 3 come into contact, the positions where all push plates 8 of button structure 2 are connected are separated from the upper connecting end 14 of blood collection needle fixing assembly 4. The second spring 21 releases energy, thereby pushing the blood collection needle fixing assembly 4 to move and push out the blood collection needle 7. At the same time, the fourth spring 33 (located between the end of inner cylinder 3 away from depth adjustment assembly 6 and the upper connecting end 14) is compressed. When the ribs on both sides of the guide shaft 13 of blood collection needle fixing assembly 4 hit the corresponding position in the adjusting cap 29, the blood collection needle 7 stops being pushed out. Then, under the action of the third spring 19 (located between inner cylinder 3 and blood collection needle fixing assembly 4) and the fourth spring 33, the blood collection needle 7 is pulled back and retracted into the inner cavity of the guide shaft 13 to avoid secondary scratches.

[0117] If the first blood collection fails, such as due to insufficient blood volume or failure to pierce the skin, there is no need to remove the depth adjustment component 6. The user can directly press the button to complete a new gear shift and firing. Each time the user tries again, they can rotate the depth adjustment component 6 to change the gear position to correspond with the blood collection needle 7, making it easier to complete the blood collection operation smoothly.

[0118] (III) Needle Removal Mode Stage:

[0119] When blood collection is successful and the lancet 7 needs to be replaced, switch to the needle retraction mode. Specifically, hold the adjustment cap 29 of the depth adjustment component 6 and pull it out axially to completely remove the depth adjustment component 6, exposing the bottom opening of the guide shaft 13 (visible at the tail of the lancet 7). At this time, the guide rod 11 of the needle retraction structure 9 is precisely aligned with the push plate 8 of the button structure 2. Hold the fixing cylinder 1 with one hand and press the button body 17 with the thumb of the other hand. This force is greater than the force in the blood collection mode to ensure that the needle is retracted in place. Press the button body 17 to... The push plate 8 of the button structure 2 abuts against the guide rod 11. Pressing the button pushes the guide rod 11 to move downward along the axis. The guide rod 11 drives the connector 10 to move downward synchronously along the guide groove 16 and the moving guide groove of the guide shaft 13. The pusher 12 on the other side of the connector 10 moves downward accordingly, pushing the tail of the blood collection needle 7, so that the blood collection needle 7 is separated from the bottom opening of the guide shaft 13 and falls into the medical waste bin to avoid contamination. When the thumb is released, the connector 10 moves upward to reset, and the button body 17 rebounds to the initial position under the action of the first spring 20.

[0120] (iv) Cleaning and Resetting Phase:

[0121] Press the blood collection site with a sterile cotton swab for 3-5 seconds to stop the bleeding, avoiding rubbing. If blood oozes out, wipe it clean with a new sterile cotton swab. Reinstall the depth adjustment component 6 back into the inner tube 3 (following the pre-operative assembly steps), and press the button body 17 to confirm that all components are reset properly. Store the blood collection pen in its dedicated packaging box, avoiding direct sunlight, high temperature, and humid environments, until the next use.

[0122] The difference between the specific working process of Embodiment 2 and Embodiment 1 is that in the needle retraction mode, the needle retraction mode of Embodiment 2 requires holding the mounting base 30 of the depth adjustment component 6 and rotating it to remove the depth adjustment component 6. The rest of the process is the same and will not be described in detail here.

[0123] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A continuously pushable blood collection pen, characterized in that, include: The device comprises a button structure (2), a transmission unit, a needle retraction structure (9), and a depth adjustment component (6). The button structure (2), the transmission unit, the depth adjustment component (6), and the blood collection needle fixing component (4) are arranged along a first axis. The needle retraction structure (9) is connected to the transmission unit. The relative positional relationship between the depth adjustment component (6) and the transmission unit in the first direction has a first state and a second state. The first direction is a circumferential direction around the first axis. The button structure (2) has push plates (8) arranged at intervals along the first direction at one end near the transmission unit, and a cavity (18) is formed between adjacent push plates (8). The transmission unit includes an inner cylinder (3) and a rotary positioning structure (5). The inner cylinder (3) has a first mating surface, and the rotary positioning structure (5) has a second mating surface. The first mating surface and the second mating surface are in sliding contact. The inner cylinder (3) is connected to the needle retraction structure (9), and the two can rotate synchronously. An elastic element (22) is sleeved on the inner cylinder (3) and / or the rotary positioning structure (5). The depth adjustment component (6) abuts against the end of the rotary positioning structure (5) away from the second mating surface, and the depth adjustment component (6) has an installed state and a removed state; When the depth adjustment component (6) is in the installation state, the second mating surface presses against the first mating surface, causing the rotary positioning structure (5) to drive the needle retraction structure (9) to rotate and twist the elastic element (22) to store energy, so that the depth adjustment component (6) and the transmission unit are in the second state. At this time, the button structure (2) is pressed, so that the end of the needle retraction structure (9) is inserted into the cavity (18), thereby preventing the pushing force of the button structure (2) in the first direction from acting on the transmission unit, so as to prevent the blood collection needle (7) in the blood collection needle fixing component (4) from being pushed out. When the depth adjustment component (6) is in the removed state, the rotation positioning structure (5) and the needle retraction structure (9) are rotated and reset in the opposite direction under the force of the elastic element (22), so that the depth adjustment component (6) and the transmission unit are in the first state. At this time, the button structure (2) is pressed, so that the end of the needle retraction structure (9) abuts against the end face of the push plate (8), thereby allowing the pushing force of the button structure (2) in the first direction to act on the transmission unit to push the blood collection needle (7) in the blood collection needle fixing component (4) out along the direction of the first axis.

2. The continuously pushable blood collection pen according to claim 1, characterized in that, The depth adjustment assembly (6) has an adjustment cap (29) that abuts against the end of the rotary positioning structure (5) away from the second mating surface; When the adjustment cap (29) is installed, the depth adjustment component (6) is in the installed state; when the adjustment cap (29) is removed, the depth adjustment component (6) is in the removed state.

3. A continuously pushable blood collection pen, characterized in that, include: The device comprises a button structure (2), a transmission unit, a needle retraction structure (9), and a depth adjustment component (6). The button structure (2), the transmission unit, the depth adjustment component (6), and the blood collection needle fixing component (4) are arranged along a first axis. The needle retraction structure (9) is connected to the transmission unit. The relative positional relationship between the depth adjustment component (6) and the transmission unit in the first direction has a first state and a second state. The first direction is a circumferential direction around the first axis. The button structure (2) has push plates (8) spaced apart along the first direction at one end near the transmission unit, and a cavity (18) is formed between adjacent push plates (8); the transmission unit includes an inner cylinder (3), and the outer wall of the inner cylinder (3) is provided with an axially protruding locking block (25); the depth adjustment component (6) is slidably connected to the locking block (25); the inner cylinder (3) is connected to the needle retraction structure (9), and the two can rotate synchronously; When the depth adjustment assembly (6) is installed and rotated, the locking block (25) is inserted into the depth adjustment assembly (6) and rotates synchronously with the rotation of the depth adjustment assembly (6), thereby driving the inner cylinder (3) and the needle retraction structure (9) to rotate, so that the depth adjustment assembly (6) and the transmission unit are in the second state. At this time, the button structure (2) is pressed, so that the end of the needle retraction structure (9) is inserted into the cavity (18), thereby preventing the pushing force of the button structure (2) in the first direction from acting on the transmission unit, so as to prevent the blood collection needle (7) in the blood collection needle fixing assembly (4) from being pushed out. When the depth adjustment component (6) is disassembled, the depth adjustment component (6) is rotated in the opposite direction, causing the locking block (25) to rotate synchronously. The depth adjustment component (6) is then removed. At the same time, the inner cylinder (3) and the needle retraction structure (9) rotate in the opposite direction so that the depth adjustment component (6) and the transmission unit are in the first state. At this time, the button structure (2) is pressed so that the end of the needle retraction structure (9) abuts against the end face of the push plate (8), thereby allowing the pushing force of the button structure (2) in the first direction to act on the transmission unit to push the blood collection needle (7) in the blood collection needle fixing component (4) out along the direction of the first axis.

4. A continuously pushable blood collection pen according to claim 3, characterized in that, The depth adjustment assembly (6) includes an adjustment cap (29) and a mounting base (30) rotatably connected to the adjustment cap (29). The inner wall of the mounting base (30) is provided with a slot (27) slidably connected to the locking block (25).

5. A continuously pushable blood collection pen according to claim 1 or 3, characterized in that, The button structure (2) includes: The button body (17) has an outer wall that slides relative to the transmission unit. The button body (17) has a push plate (8) inside. All the push plates (8) are connected to each other and can be attracted and fixed to the upper connection end (14) of the blood collection needle fixing assembly (4).

6. A continuously pushable blood collection pen according to claim 1 or 3, characterized in that, The needle retraction structure (9) includes: A connector (10) is slidably connected to the inner cylinder (3); two parallel guide rods (11) are provided on one side of the connector (10), with the free end of the guide rods (11) facing the button structure (2); a pusher (12) is provided on the other side of the connector (10), with the axis of the pusher (12) aligned with the axis of the blood collection needle (7); the pusher (12) is slidably connected to the blood collection needle fixing assembly (4).

7. A continuously pushable blood collection pen according to claim 6, characterized in that, The blood collection needle fixing assembly (4) further includes: a guide shaft (13), the guide shaft (13) is hollow to form an inner cavity for the blood collection needle (7) to be installed, the lower half of the guide shaft (13) has symmetrically opened movable guide grooves on its side wall, the connecting member (10) is located inside the guide shaft (13) and is slidably connected to the movable guide groove, and the pushing member (12) can slide along the guide shaft (13) to push out the blood collection needle (7).

8. A continuously pushable blood collection pen according to claim 1 or 3, characterized in that, The transmission unit also includes: A fixed cylinder (1) is provided, and at least the inner cylinder (3) and the needle retraction structure (9) are installed inside the fixed cylinder (1); the inner wall of the fixed cylinder (1) is slidably connected to the button structure (2); a through hole is provided on the side wall of the fixed cylinder (1); a reset ring (24) is provided on the side of the fixed cylinder (1) near the button structure (2); a button (23) is installed on the side wall of the reset ring (24); and the button (23) is located at the through hole. The first spring (20) is located between the fixed cylinder (1) and the button structure (2). When the button (23) is pressed, the button structure (2) and the fixed cylinder (1) separate, and the force of the first spring (20) drives the button structure (2) to reset.

9. A continuously pushable blood collection pen according to claim 1 or 3, characterized in that, The depth adjustment component (6) includes at least: An adjustment structure (26) is connected to an adjustment cap (29). The adjustment structure (26) has multiple positions arranged along its axial direction with progressively increasing heights. Both the adjustment structure (26) and the adjustment cap (29) have through holes for the blood collection needle (7) to pass through. When different gear positions correspond to the blood collection needle fixing assembly (4), the blood collection needle (7) has different movable strokes.

10. A continuously pushable blood collection pen according to claim 4, characterized in that, Also includes: A positioning component is disposed between the inner cylinder (3) and a structure that mates with the inner cylinder (3) or between the mounting base (30) and a structure that mates with the mounting base (30); The positioning component has a cooperating protrusion and a positioning groove, the positioning groove having a first locking position and a second locking position; When the protrusion engages with the first locking position of the positioning groove, the depth adjustment component (6) and the transmission unit are in the first state; When the protrusion engages with the second locking position of the positioning groove, the depth adjustment component (6) and the transmission unit are in the second state.

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