A blood sampling pen that is easy to operate

Abstract

This invention provides an easy-to-operate lancing pen, comprising an outer cylinder, a depth adjustment component, a pressing button, a lancing needle fixing component, and a pressing motor component consisting of a first spring, a second spring, and a third spring. The depth adjustment component is located at the bottom of the outer cylinder and is fixedly engaged with it. The pressing button is inserted into the outer cylinder and slides along its inner wall to facilitate needle dispensing when pressed, in conjunction with the pressing motor component. The lancing needle fixing component includes a guide shaft, a lancing needle engaging component, and an upper connecting end. The lancing needle engaging component and the upper connecting end are respectively fixed at the bottom and top of the guide shaft. A mating connecting end is provided on the top wall of the inner cylinder of the pressing button, which engages with the upper connecting end for fixation. This invention has a simple structure, is easy to manufacture and install, and features a limiting component inside the outer cylinder to ensure vertical linear movement of the lancing pen during use, improving the accuracy of the lancing needle's movement.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and in particular relates to an easy-to-use blood collection pen. 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. Currently, its most widespread application is in the field of diabetes, where patients provide a small blood sample for personal blood glucose testing. 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, such as in vitamin D testing.

[0003] Currently, there are two main types of lancing devices on the domestic and international medical markets. The first type is the standard lancing device, which has a simple structure consisting of an adjustable cap, a ejector mechanism, and a pen barrel. To use it, the lancet is inserted into the needle slot inside the pen, and the adjustable cap is then attached to adjust the puncture depth (usually only five depth settings). The pen barrel is pulled back to cock the lancing device, and the end of the pen cap is pressed against a suitable area of ​​the finger or arm. Pressing the button ejects the lancet to collect blood. After collection, the cap is unscrewed, and the lancet is removed and discarded manually. The second type is the removable lancing device, which adds a needle removal function. Its usage is similar to the first type, but the main difference is that after collection, the cap is unscrewed, and the lancet is removed and discarded using the needle removal mechanism on the pen, eliminating the need to remove it manually. Undoubtedly, the second type is safer and more convenient to use. However, the current lancets vibrate significantly and have poor linearity when moving within the pen, thus affecting the accuracy of their movement. Additionally, they require pressing the button after shifting to the correct position to eject the lancet, which involves multiple steps and is cumbersome to operate. Summary of the Invention

[0004] The problem this invention aims to solve is to provide an easy-to-operate lancing pen with a simple structure that is easy to manufacture and install. A limiting component is provided inside the outer cylinder, and a through hole is provided within the limiting component for the guide shaft to pass through. This limits the sliding of the lancing needle fixing assembly, ensuring vertical movement and linear motion of the lancing pen during use, thereby improving the movement accuracy of the lancing needle. The lancing pen of this invention is simple to use, eliminating the need for a gear shift. After installing the lancing needle and adjusting the needle depth, simply press to extend the needle for use. It is simple and convenient to operate and suitable for various groups of people.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an easy-to-operate blood collection pen, including an outer cylinder, a depth adjustment component, a pressing button, a blood collection needle fixing component, and a pressing motor component composed of three springs: a first spring, a second spring, and a third spring.

[0006] The depth adjustment component is located at the bottom of the outer cylinder and is fixedly engaged with the outer cylinder; the pressing button is inserted inside the outer cylinder and slides along the inner wall of the outer cylinder so as to facilitate needle ejection when pressed in conjunction with the pressing motor component.

[0007] The blood collection needle fixing assembly includes a guide shaft, a blood collection needle locking component, and an upper connecting end. The blood collection needle locking component and the upper connecting end are respectively fixedly installed at the bottom and top of the guide shaft. The inner cylinder top wall of the pressing key is provided with a mating connecting end, which can be engaged and fixed after contacting the upper connecting end.

[0008] A limiting component is fixedly installed inside the outer cylinder, and the guide shaft passes through the limiting component. The first spring, the second spring, and the third spring are all installed inside the outer cylinder. The first spring is installed between the limiting component and the top wall of the pressing button and covers the guide shaft, the upper connecting end, and the mating connecting end. The second spring is installed on the guide shaft and is installed between the limiting component and the upper connecting end. The third spring is installed on the guide shaft and is installed between the limiting component and the blood collection needle engaging component.

[0009] Furthermore, symmetrical guide grooves are provided on the inner wall of the outer cylinder, and a locking component is fixedly provided on the top side wall of the guide groove; the pressing key forms two symmetrically arranged support arms through the slot, the support arms have through grooves inside, and a protruding locking block is fixedly provided on the outer wall of the bottom of the support arm.

[0010] Furthermore, the bottom outer wall of the protruding card block is set with an inclined surface.

[0011] Furthermore, the upper connecting end is a cylindrical iron part, the mating connecting end is a magnet, and an internal fixing component is fixedly provided on the top wall of the inner cylinder of the pressing key. The magnet is fixedly embedded in the internal fixing component, and the first spring is sleeved on the outside of the internal fixing component.

[0012] Furthermore, the blood collection needle is interference-fitted into the blood collection needle clamping assembly. The blood collection needle includes a needle handle connecting end, a needle tip, and a protective sleeve. The needle tip is fixed to the needle handle connecting end, and the protective sleeve protects the needle tip. The needle handle connecting end is clamped and fixed inside the blood collection needle clamping assembly.

[0013] Furthermore, a needle ejection assembly is provided to facilitate ejecting the blood collection needle for replacement with a new one; the needle ejection assembly includes a needle ejection moving part and a needle ejection holding part.

[0014] Furthermore, the needle retraction moving component includes an integrally formed moving button, a retaining member moving arm, and a needle retraction arm. One end of the moving button, the retaining member moving arm, and the needle retraction arm is fixedly connected to form an integral structure through a connecting plate. The retaining member moving arm is arranged in a Z-shape from the free end to the fixed end. The bottom wall shape of the moving button is also arranged in a Z-shape with the retaining member moving arm, and the straight-line distance between the two is consistent.

[0015] The needle ejector includes a retaining block and a circular guide post fixed to the top of the retaining block. A first through groove is provided between the retaining block and the circular guide post, and a second through groove is provided at the bottom of the retaining block so that the two ends form limiting retaining ends.

[0016] The retaining member moving arm is inserted into the first through slot, the circular guide post is located between the moving button and the retaining member moving arm, and the needle retraction arm is engaged in the second through slot.

[0017] Furthermore, two limiting components are provided, namely a first limiting ring and a second limiting ring. The first limiting ring is located near the press button, and a limiting protrusion is fixed on the inner wall of the first limiting ring. The end of the first spring is sleeved on the limiting protrusion. The second limiting ring is located near the depth adjustment component, and a guide cylinder is fixedly provided on the second limiting ring. The guide cylinder is positioned towards the first limiting ring.

[0018] The guide shaft is hollow inside and communicates with the hollow part of the blood collection needle clamping component. The guide shaft is sleeved inside the guide cylinder. The side wall of the guide shaft has a needle withdrawal guide groove and a limiting groove communicating with the needle withdrawal guide groove. The outer wall of the guide cylinder adjacent to the second limiting ring has a first locking groove and a second locking groove. The first locking groove is located directly outside the needle withdrawal guide groove. The second spring is sleeved on the guide shaft and disposed between the guide cylinder and the upper connecting end. The third spring is sleeved on the guide shaft and disposed between the second limiting ring and the blood collection needle clamping component.

[0019] A button through slot is provided on the outer wall of the outer cylinder. The movable button is located on the outer wall of the outer cylinder and its bottom surface is slidably arranged along the outer cylinder. The moving arm of the retaining member is inserted into the outer cylinder. The needle retraction arm is inserted into the inside of the guide shaft through the first retaining slot and the needle retraction guide slot. The limiting end of the needle retraction retaining member is provided in the second retaining slot so as to move downward and be inserted into the limiting slot to limit and lock the guide shaft.

[0020] Furthermore, the depth adjustment component includes a fixed limiting component, a lifting component, and a rotating limiting head. The fixed limiting component is composed of an integrally formed upper fixing ring, an intermediate gear adjusting ring, and a bottom locking ring connected to each other in a stepped manner, and the ring diameters of the upper fixing ring, the intermediate gear adjusting ring, and the bottom locking ring decrease sequentially.

[0021] The lifting component is sleeved on the bottom locking ring. The outer wall of the lifting component has an upwardly sloping groove. The outer wall of the bottom locking ring is provided with a slider, which is locked in the groove. The bottom wall of the lifting component has a through hole for the tip of the blood collection needle to pass through.

[0022] The rotating limiting head is sleeved on the intermediate gear adjusting ring. A locking block is fixedly installed on the bottom side wall of the intermediate gear adjusting ring. An annular inner groove is opened on the inner wall of the rotating limiting head, and the locking block is locked in the annular inner groove. A limiting guide block is fixedly installed on the inner wall of the rotating limiting head. A vertical groove is opened on the outer wall of the lifting component, and the limiting guide block is locked in the vertical groove. The limiting guide block is located on the lower side of the annular inner groove. A through hole for the tip of the blood collection needle to pass through is also opened on the bottom wall of the rotating limiting head.

[0023] Furthermore, the inner wall of the upper fixing ring is provided with a locking protrusion, and the bottom outer wall of the outer cylinder is provided with a locking groove. The outer cylinder is inserted into the upper fixing ring and the locking protrusion is locked and fixed in the locking groove, so as to lock and fix the outer cylinder and the upper fixing limiting member.

[0024] The outer wall of the intermediate gear adjustment ring is grooved to form a gear adjustment component. The movable end of the gear adjustment component is provided with a protrusion. The inner wall of the rotating limiting head that contacts the intermediate gear adjustment ring is provided with multiple gear grooves. The protrusion is engaged in one of the gear grooves. The outer wall of the rotating limiting head is provided with a depth indicator bar corresponding to the gear groove.

[0025] The advantages and positive effects of this invention are:

[0026] 1. The present invention has a simple structure, which is easy to produce and install. A limiting component is provided inside the outer cylinder, and a through hole is provided inside the limiting component for the guide shaft to pass through, thereby limiting the sliding of the blood collection needle fixing component, thus ensuring that the blood collection pen moves vertically during use, ensuring linear motion, and improving the movement accuracy of the blood collection needle.

[0027] 2. The blood collection pen of the present invention is simple to use, eliminating the need for a gear shift. After installing the blood collection needle and adjusting the needle depth, simply press to release the needle. It is simple and convenient to operate and suitable for various groups of people. Attached Figure Description

[0028] Figure 1 This is a split diagram of Embodiment 1 of an easy-to-use blood collection pen of the present invention;

[0029] Figure 2 This is a schematic diagram of the overall structure of an easy-to-use blood collection pen according to Embodiment 1 of the present invention;

[0030] Figure 3 yes Figure 2Sectional view of AA;

[0031] Figure 4 This is a schematic diagram of the press button in a blood collection pen that is easy to operate according to the present invention;

[0032] Figure 5 This is a schematic diagram of the outer cylinder of an easy-to-operate blood collection pen according to Embodiment 1 of the present invention;

[0033] Figure 6 This is a cross-sectional view of the outer cylinder of an easy-to-operate blood collection pen according to Embodiment 1 of the present invention;

[0034] Figure 7 This is a schematic diagram of the blood collection needle in an easy-to-use blood collection pen of the present invention;

[0035] Figure 8 This is an exploded view of the depth adjustment component in a blood collection pen that is easy to operate according to the present invention;

[0036] Figure 9 This is a schematic diagram of the fixed limiting component in a blood collection pen that is easy to operate according to the present invention;

[0037] Figure 10 This is a schematic diagram of the lifting component in a blood collection pen that is easy to operate according to the present invention;

[0038] Figure 11 This is a schematic diagram of the rotating limiting head in a blood collection pen that is easy to operate according to the present invention;

[0039] Figure 12 This is a split diagram of Embodiment 2 of the easy-to-use blood collection pen of the present invention;

[0040] Figure 13 This is a schematic diagram of the overall structure of a blood collection pen embodiment 2 of the present invention, which is easy to operate;

[0041] Figure 14 yes Figure 3 Sectional view of AA;

[0042] Figure 15 This is a first-direction view of the outer cylinder of a blood collection pen embodiment 2 of the present invention, which is easy to operate;

[0043] Figure 16 This is a second-direction view of the outer cylinder in Embodiment 2 of the present invention, which is an easy-to-operate blood collection pen;

[0044] Figure 17 This is a third-party view of the outer cylinder in Embodiment 2 of the present invention, which is an easy-to-operate blood collection pen;

[0045] Figure 18 This is a schematic diagram of the needle retraction moving part in Embodiment 2 of the present invention, which is an easy-to-operate blood collection pen;

[0046] Figure 19 This is a schematic diagram of the needle withdrawal holder in Embodiment 2 of the present invention, which is an easy-to-operate blood collection pen;

[0047] Figure 20 This is a schematic diagram of the blood collection needle fixing component in Embodiment 2 of the present invention, which is an easy-to-operate blood collection pen;

[0048] In the picture:

[0049] 1-Outer cylinder, 101-Limiting component, 1011-First limiting ring, 1012-Second limiting ring, 1013-Limiting convex ring, 1014-Guide cylinder, 1014-1, First slot, 1014-2, Second slot, 102-Guide groove, 103-Clamping component, 104-Button through groove, 105-Clamping groove;

[0050] 2-Depth adjustment component, 21-Fixed limit component, 211-Upper fixed ring, 2111-Clamping protrusion, 212-Intermediate gear adjustment ring, 2121-Clamping block, 2122-Gear adjustment component, 2123-Protrusion, 213-Bottom clamping ring, 2131-Slider, 22-Lifting component, 221-Slide groove, 222-Vertical groove, 23-Rotating limit head, 231-Annular inner groove, 232-Limiting guide block, 233-Gear groove, 234-Depth indicator bar;

[0051] 3-Press button, 301-Matching connection end, 302-Support arm, 303-Through groove, 304-Protruding locking block, 305-Built-in fixing component;

[0052] 4-Blood collection needle fixing assembly, 401-Guide shaft, 4011-Needle withdrawal guide groove, 4012-Limiting groove, 402-Blood collection needle clamping part, 403-Upper connecting end;

[0053] 5-Press motor assembly, 501-First spring, 502-Second spring, 503-Third spring;

[0054] 6-Needle retraction assembly, 61-Needle retraction moving part, 611-Movement button, 612-Holding part moving arm, 613-Needle retraction arm, 62-Needle retraction holding part, 621-Holding block, 6211-First through slot, 6212-Second through slot, 622-Circular guide post, 623-Limiting end.

[0055] 7-Blood collection needle, 701-Needle handle connection end, 702-Needle tip, 703-Protective sleeve. Detailed Implementation

[0056] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0057] Example 1:

[0058] Reference Figures 1 to 3 This embodiment provides an easy-to-operate blood collection pen, including an outer cylinder 1, a depth adjustment component 2, a press button 3, a blood collection needle fixing component 4, and a pressing motor component 5 composed of three springs: a first spring 501, a second spring 502, and a third spring 503. The depth adjustment component 2 is used to adjust the insertion depth of the blood collection needle 7, thus making it suitable for blood collection on skin with different tissue thicknesses. The press button 3 is used to press and drive the pressing motor component 5 to move up and down on the blood collection needle fixing component 4 to insert the needle or to drive the blood collection needle 7 back. The pressing motor component 5 drives the operation of the blood collection needle fixing component 4 through the cooperation of the three springs: the first spring 501, the second spring 502, and the third spring 503, thereby achieving the purpose of needle insertion and blood collection.

[0059] The depth adjustment component 2 is located at the bottom of the outer cylinder 1 and is fixedly engaged with the outer cylinder 1; the pressing button 3 is inserted into the outer cylinder 1 and slides along the inner wall of the outer cylinder 1 so that it can cooperate with the pressing motor component 5 to eject the needle when pressed.

[0060] The blood collection needle fixing assembly 4 includes a guide shaft 401, a blood collection needle clamping component 402, and an upper connecting end 403. The blood collection needle clamping component 402 and the upper connecting end 403 are respectively fixedly disposed at the bottom and top of the guide shaft 401. A mating connecting end 301 is provided on the top wall of the inner cylinder of the press button 3. The mating connecting end 301 can engage and fix the upper connecting end 403 after contact. In this embodiment, the upper connecting end 403 is a cylindrical iron part, the mating connecting end 301 is a magnet, and a magnet is fixedly disposed on the top wall of the inner cylinder of the press button 3. The built-in fixing member 305 has a magnet embedded within it, and the first spring 501 is sleeved on the outside of the built-in fixing member 305. Alternatively, the end of the first spring 501 can also be clipped onto the end of the built-in fixing member 305, as long as the compression and rebound functions are achieved. The specific fixing position can be modified according to actual needs. During use, when the pressing button 3 moves downwards with pressure, its mating connection end 301 contacts the upper connection end 403, and due to magnetic attraction, the two remain attached. Furthermore, the upper connection end 403 and the mating connection end 301 can be configured as a meshing or snap-fit ​​structure, engaging and locking when in contact, and separating under pressure.

[0061] Reference Figure 6 and Figure 3A limiting member 101 is fixedly installed inside the outer cylinder 1. A guide shaft 401 passes through the limiting member 101. A first spring 501, a second spring 502, and a third spring 503 are all installed inside the outer cylinder 1. The first spring 501 is located between the limiting member 101 and the top wall of the pressing button 3, and it covers the guide shaft 401, the upper connecting end 403, and the mating connecting end 301. The second spring 502 is fitted onto the guide shaft 401 and is located between the limiting member 101 and the upper connecting end 403. The third spring is fitted onto the guide shaft 401 and is located between the limiting member 101 and the blood collection needle engaging member 402. The limiting member 101 serves two purposes: firstly, it limits the movement of the guide shaft 401, ensuring that the guide shaft 401 moves vertically and linearly during sliding; secondly, it facilitates the installation and fixation of the first spring 501, the second spring 502, and the third spring 503, providing fixed support at their ends.

[0062] In actual use, the blood collection pen of this technical solution works by pressing down on the button 3. The button 3 moves downward, compressing the first spring 501, which in turn moves the connecting end 301 towards the upper connecting end 403. When they are close, they are attracted together by magnetic force. When the button 3 is pressed to the bottom, the magnetic force attracts the blood collection needle fixing component 4 for fixation. After releasing the button 3, the first spring 501 extends under the rebound force, causing the button 3 and the magnetically attracted blood collection needle fixing component 4 to move upward. At this time, the second spring 502 is compressed, and the third spring 50... When button 3 is pulled open, the magnetic force is insufficient to support the stored force of the second spring 502 and the third spring 503 when the button 3 returns to a sufficiently high position. At this time, the connecting end 301 and the upper connecting end 403 are disconnected. The blood collection needle fixing assembly 4 moves rapidly downward under the reverse elastic force of the second spring 502 and the tensile elastic force of the third spring 503, thereby driving the blood collection needle 7 to exit, so that the needle tip 702 passes through the protective sleeve 703 and the depth adjustment assembly 2 to pierce the finger for blood collection. Then, under the action of the second spring 502 and the third spring 503, it retracts again and stops moving after reaching balance.

[0063] Reference Figure 5 , Figure 6 and Figure 4In this embodiment, guide grooves 102 are symmetrically provided on the inner wall of the outer cylinder 1. The guide grooves 102 facilitate positioning during the installation of the outer cylinder 1. A locking member 103 is fixedly provided on the top side wall of the guide groove 102. The locking member 103 is used to lock and fix with the protruding locking block 304 of the press key 3. The press key 3 forms two symmetrically arranged support arms 302 through the slot. The support arms 302 have through grooves 303 inside. The protruding locking block 304 is fixedly provided on the outer wall of the bottom of the support arms 302. During installation, the press key 3 is inserted into the outer cylinder 1. At this time, the support arms 302 bend inward along the inner wall of the outer cylinder 1 until the locking member 103 is engaged in the through groove 303 and locked and fixed with the protruding locking block 304. Under the support of the first spring 501, the locking member 103 and the protruding locking block 304 are locked together, so that the press key 3 is fixed in the outer cylinder 1.

[0064] In addition, the bottom outer wall of the protruding latch 304 is sloped. The slope makes it easier for the support arm 302 to bend inward when the press button 3 is assembled, so that the protruding latch 304 can be smoothly engaged and fixed with the locking member 103.

[0065] Reference Figure 3 and Figure 7 In this embodiment, a blood collection needle 7 is interference-fitted into the blood collection needle clamp 402. The blood collection needle 7 includes a needle handle connecting end 701, a needle tip 702, and a protective sleeve 703. The needle tip 702 is fixed to the needle handle connecting end 701, and the protective sleeve 703 protects the needle tip 702. The needle handle connecting end 701 is clamped and fixed inside the blood collection needle clamp 402. The needle handle connecting end 701 is used to insert and fix it inside the blood collection needle clamp 402 to facilitate the fixed installation of the blood collection needle 7 and the blood collection needle clamp 402. The protective sleeve 703 protects the needle tip of the needle tip 702 to ensure sterility and safety, and is easy to use. The protective sleeve 703 is made of soft materials such as soft rubber.

[0066] Reference Figures 8 to 11 In this embodiment, the depth adjustment component 2 includes a fixed limiting member 21, a lifting member 22, and a rotating limiting head 23. The fixed limiting member 21 is composed of an integrally formed upper fixing ring 211, an intermediate gear adjusting ring 212, and a bottom locking ring 213 connected to each other in a stepped manner, and the ring diameters of the upper fixing ring 211, the intermediate gear adjusting ring 212, and the bottom locking ring 213 decrease sequentially. The fixed limiting member 21 is used to install with the outer cylinder 1, and at the same time connects the lifting member 22 and the rotating limiting head 23.

[0067] The lifting component 22 is sleeved on the bottom retaining ring 213. The outer wall of the lifting component 22 has an upwardly sloping groove 221. The outer wall of the bottom retaining ring 213 is provided with a slider 2131, which is engaged in the groove 221. The bottom wall of the lifting component 22 has a through hole for the needle tip of the blood collection needle 7 to pass through. The slider 2131 is slidably disposed in the groove 221. When the lifting component 22 is rotated, the slider 2131 can slide along the groove 221, thereby changing the height of the bottom wall of the lifting component 22 and realizing the adjustment of the needle height.

[0068] A rotating limiting head 23 is fitted onto an intermediate gear adjusting ring 212. A locking block 2121 is fixedly installed on the bottom side wall of the intermediate gear adjusting ring 212. An annular inner groove 231 is formed on the inner wall of the rotating limiting head 23, and the locking block 2121 is locked in the annular inner groove 231. The locking block 2121 and the annular inner groove 231 are locked together to limit the installation of the rotating limiting head 23 and the fixed limiting member 21, so that the two do not separate. A limiting guide block 232 is fixedly installed on the inner wall of the rotating limiting head 23, and a vertical groove 222 is formed on the outer wall of the lifting member 22. The limiting guide block 232 is fixedly installed on the inner wall of the rotating limiting head 23. 2. The lifting member 22 is locked in the vertical groove 222. The limiting guide block 232 is locked in the vertical groove 222 to lock the lifting member 22 and the limiting guide block 232. When the fixed limiting member 21 is rotated, the lifting member 22 is driven to rotate. Due to the limitation of the slider 2131, the lifting member 22 moves up and down along the limiting guide block 232 while rotating, thereby ensuring its direction of movement and realizing the adjustment of the up and down position of the lifting member 22. The limiting guide block 232 is set on the lower side of the annular inner groove 231. The bottom wall of the rotating limiting head 23 is also provided with a through hole for the needle tip of the blood collection needle 7 to pass through.

[0069] Reference Figure 9 and Figure 5 In this embodiment, a locking protrusion 2111 is provided on the inner wall of the upper fixing ring 211, and a locking groove 105 is provided on the bottom outer wall of the outer cylinder 1. The outer cylinder 1 is inserted into the upper fixing ring 211 and the locking protrusion 2111 is locked and fixed in the locking groove 105 to lock and fix the outer cylinder 1 and the upper fixing limiting member 21. After the locking protrusion 2111 is locked into the locking groove 105, the upper fixing ring 211 and the outer cylinder 1 can be fixedly installed to maintain stable installation.

[0070] A gear adjustment component 2122 is formed on the outer wall of the intermediate gear adjustment ring 212 by a slot. A protrusion 2123 is provided at the movable end of the gear adjustment component 2122. Multiple gear grooves 233 are provided on the inner wall of the rotating limit head 23 that contacts the intermediate gear adjustment ring 212. The protrusion 2123 is engaged in one of the gear grooves 233. A depth indicator strip 234 corresponding to the gear groove 233 is provided on the outer wall of the rotating limit head 23. This design facilitates positioning during rotation. Each gear groove 233 serves as a rotating locking position, facilitating control of the adjustment depth. When adjusted to the appropriate position, the protrusion 2123 engages in the corresponding gear groove 233 for positioning, thus simplifying use. When further adjustment is needed, simply rotate the rotating limit head 23 again to continue adjustment.

[0071] When using the lancing pen in this embodiment:

[0072] Remove the depth adjustment component 2 and insert the blood collection needle 7 into the blood collection needle retainer 402 to fix the blood collection needle 7.

[0073] The needle depth is adjusted by adjusting the depth adjustment component 2. The lifting component 22 is moved up and down by rotating the rotating limit head 23. After adjusting to the appropriate depth, the corresponding protrusion 2123 is locked into the stop groove 233 to fix the position so that no adjustment is needed next time.

[0074] Pressing down on the button 3 causes it to move downwards, compressing the first spring 501. This causes the connecting end 301 to move towards the upper connecting end 403. When they are close together, they are attracted together by magnetic force. When the button 3 is pressed to the bottom, the magnetic force attracts the blood collection needle fixing component 4, thus fixing it in place. Releasing the button 3 causes the first spring 501 to extend, causing the button 3 and the magnetically attracted blood collection needle fixing component 4 to move upwards. At this time, the second spring 502 is compressed, and the third spring 503 is pulled open, thus allowing the button to move upwards when pressed. When the key 3 returns to a sufficiently high position, the magnetic force is insufficient to support the stored force of the second spring 502 and the third spring 503. At this time, the connecting end 301 and the upper connecting end 403 are disconnected. Driven by the reverse elastic force of the second spring 502 and the tensile elastic force of the third spring 503, the blood collection needle fixing assembly 4 moves rapidly downward, thereby driving the blood collection needle 7 out of the needle so that the needle tip 702 passes through the protective sleeve 703 and the depth adjustment assembly 2 to pierce the finger for blood collection. Then, under the action of the second spring 502 and the third spring 503, it retracts again and stops moving after reaching equilibrium.

[0075] Example 2:

[0076] Compared with Embodiment 1, this embodiment of the blood collection pen is further provided with a needle withdrawal component 6 for needle withdrawal, the specific structure of which is as follows:

[0077] Reference Figures 12 to 14 This embodiment provides an easy-to-operate blood collection pen, including an outer cylinder 1, a depth adjustment component 2, a press button 3, a blood collection needle fixing component 4, and a pressing motor component 5 composed of three springs: a first spring 501, a second spring 502, and a third spring 503. The depth adjustment component 2 is used to adjust the insertion depth of the blood collection needle 7, thus making it suitable for blood collection on skin with different tissue thicknesses. The press button 3 is used to press and drive the pressing motor component 5 to move up and down on the blood collection needle fixing component 4 to insert the needle or to drive the blood collection needle 7 back. The pressing motor component 5 drives the operation of the blood collection needle fixing component 4 through the cooperation of the three springs: the first spring 501, the second spring 502, and the third spring 503, thereby achieving the purpose of needle insertion and blood collection.

[0078] The depth adjustment component 2 is located at the bottom of the outer cylinder 1 and is fixedly engaged with the outer cylinder 1; the pressing button 3 is inserted into the outer cylinder 1 and slides along the inner wall of the outer cylinder 1 so that it can cooperate with the pressing motor component 5 to eject the needle when pressed.

[0079] The blood collection needle fixing assembly 4 includes a guide shaft 401, a blood collection needle engaging component 402, and an upper connecting end 403. The blood collection needle engaging component 402 and the upper connecting end 403 are respectively fixedly disposed at the bottom and top of the guide shaft 401. A mating connecting end 301 is provided on the top wall of the inner cylinder of the press button 3. The mating connecting end 301 can be engaged and fixed after contacting the upper connecting end 403. In this embodiment, the upper connecting end 403 is a cylindrical iron part, and the mating connecting end 301 is a magnet. An internal fixing component 305 is fixedly disposed on the top wall of the inner cylinder of the press button 3. The magnet is fixedly embedded in the internal fixing component 305, and the first spring 501 is sleeved on the outside of the internal fixing component 305. When in use, when the press button 3 moves down with the press, its mating connecting end 301 and the upper connecting end 403 are attracted together by magnetic force and the two no longer separate. In addition, the upper connecting end 403 and the mating connecting end 301 can be configured to have a mating and interlocking structure, which will engage when they come into contact.

[0080] Reference Figure 15-17 The outer cylinder 1 is fixedly equipped with limiting components, namely a first limiting ring 1011 and a second limiting ring 1012. The first limiting ring 1011 is located near the pressing button 3, and a limiting protrusion 1013 is fixed on the inner wall of the first limiting ring 1011. The end of the first spring 501 is sleeved on the limiting protrusion 1013. The first spring 501 is located between the first limiting ring 1011 and the top wall of the pressing button 3. The second limiting ring 1012 is located near the depth adjustment component 2, and a guide cylinder 1014 is fixedly installed on the second limiting ring 1012, with the guide cylinder 1014 facing the first limiting ring 1011. (Refer to...) Figure 20The guide shaft 401 is hollow inside and communicates with the hollow part of the blood collection needle clamping component 402. The guide shaft 401 is sleeved inside the guide cylinder 1014. The side wall of the guide shaft 401 is provided with a needle withdrawal guide groove 4011 and a limiting groove 4012 communicating with the needle withdrawal guide groove 4011. The guide cylinder 1014 is provided with a first locking groove 1014-1 and a second locking groove 1014-2 adjacent to the second limiting ring 1012. The first locking groove 1014-1 is located directly outside the needle withdrawal guide groove 4011. The second spring 502 is sleeved on the guide shaft 401 and is located between the guide cylinder 1014 and the upper connecting end 403. The second spring 502 is locked between the guide cylinder 1014 and the upper connecting end 403 to provide force support for both. The third spring is sleeved on the guide shaft 401 and is located between the second limiting ring 1012 and the blood collection needle clamping component 402. There are two limiting components, which are set separately to facilitate the installation of the needle retraction assembly 6 between the first limiting ring 1011 and the second limiting ring 1012.

[0081] Reference Figure 14 In this embodiment, a needle ejection assembly 6 is also provided to facilitate the ejection of the blood collection needle 7 for replacement with a new blood collection needle 7; the needle ejection assembly 6 includes a needle ejection moving part 61 and a needle ejection holding part 62. Referring to... Figure 18 The needle withdrawal moving component 61 includes an integrally formed moving button 611, a retaining moving arm 612, and a needle withdrawal arm 613. One end of each of the moving button 611, retaining moving arm 612, and needle withdrawal arm 613 is fixedly connected as a single unit via a connecting plate. The retaining moving arm 612 is Z-shaped from its free end to its fixed end. The bottom wall shape of the moving button 611 is also Z-shaped, and the straight-line distance between them remains consistent. When the moving button 611 is pushed, it causes the retaining moving arm 612 and the needle withdrawal arm 613 to move simultaneously. As the needle withdrawal retaining arm 62 moves downwards, it engages with the limiting groove 4012, thereby fixing the guide shaft 401 and preventing it from moving, thus ensuring that the needle withdrawal arm 613 smoothly ejects the blood collection needle. (Refer to...) Figure 19 The needle ejector retainer 62 includes a retaining block 621 and a circular guide post 622 fixed to the top of the retaining block 621. A first through groove 6211 is provided between the retaining block 621 and the circular guide post 622. A second through groove 6212 is provided at the bottom of the retaining block 621 so that the two ends form limiting retaining ends 623. The retainer moving arm 612 is inserted into the first through groove 622. The circular guide post 622 is located between the moving button 611 and the retainer moving arm 612. The needle ejector arm 613 is engaged in the second through groove 6212.

[0082] When using the blood collection pen of this technical solution, pressing down on the press button 3 causes the press button 3 to move downwards, thereby compressing the first spring 501. This causes the connecting end 301 to move towards the upper connecting end 403. When the two are close together, they are attracted together by magnetic force. When the press button 3 is pressed to the bottom, the magnetic force attracts the blood collection needle fixing component 4, thus fixing it in place. After releasing the press button 3, the first spring 501 extends under the rebound force, causing the press button 3 and the magnetically attracted blood collection needle fixing component 4 to move upwards. At this time, the second spring 502 is compressed, and the third spring 50... When button 3 is pulled open, and the magnetic force is insufficient to support the stored force of the second spring 502 and the third spring 503 when button 3 returns to a sufficiently high position, the connecting end 301 and the upper connecting end 403 are disconnected. At this time, the blood collection needle fixing assembly 4 moves rapidly downward under the reverse elastic force of the second spring 502 and the tensile elastic force of the third spring 503, thereby driving the blood collection needle 7 out of the needle, so that the needle tip 702 passes through the protective sleeve 703 and the depth adjustment assembly 2 to prick the finger for blood collection. Then, under the action of the second spring 502 and the third spring 503, it retracts again and stops moving after reaching balance. After manually removing the depth adjustment assembly 2, manually sliding the moving button 611 downward will drive the needle withdrawal arm 613 downward to push the blood collection needle 7 out of the blood collection needle retainer 402, so that a new blood collection needle can be used without manual needle removal, ensuring safety.

[0083] Reference Figure 15-17 The outer cylinder 1 has symmetrical guide grooves 102 on its inner wall. A locking member 103 is fixedly installed on the top side wall of the guide groove 102, and the locking member 103 is used to engage with the protruding locking block 304 of the press button 3. The press button 3 forms two symmetrically arranged support arms 302 through slots. A through groove 303 is provided inside the support arm 302, and a protruding locking block 304 is fixedly installed on the outer wall of the bottom of the support arm 302. During installation, the press button 3 is inserted into the outer cylinder 1. At this time, the support arm 302 bends inward along the inner wall of the outer cylinder 1 until the locking member 103 engages with the through groove 303 and is fixedly engaged with the protruding locking block 304. Supported by the first spring 501, the locking member 103 and the protruding locking block 304 are locked together, thus fixing the press button 3 inside the outer cylinder 1.

[0084] In this embodiment, the bottom outer wall of the protruding latch 304 is sloped. The slope makes it easier for the support arm 302 to bend inward when the press button 3 is assembled, so that the protruding latch 304 can be smoothly engaged and fixed with the latching member 103.

[0085] In this embodiment, a blood collection needle 7 is interference-fitted into the blood collection needle clamp 402. The blood collection needle 7 includes a needle handle connecting end 701, a needle tip 702, and a protective sleeve 703. The needle tip 702 is fixed to the needle handle connecting end 701, and the protective sleeve 703 protects the needle tip 702. The needle handle connecting end 701 is clamped and fixed inside the blood collection needle clamp 402. The needle handle connecting end 701 is used to insert and fix it inside the blood collection needle clamp 402 to facilitate the fixed installation of the blood collection needle 7 and the blood collection needle clamp 402. The protective sleeve 703 protects the needle tip of the needle tip 702 to ensure sterility and safety, and is easy to use. The protective sleeve 703 is made of soft materials such as soft rubber.

[0086] In this embodiment, a button through groove 104 is provided on the outer wall of the outer cylinder 1. The movable button 611 is located on the outer wall of the outer cylinder 1 and its bottom surface is slidably arranged along the outer cylinder 1. The retaining member moving arm 612 is inserted into the outer cylinder 1. The needle retraction arm 613 is inserted into the inside of the guide shaft 401 through the first retaining groove 1014-1 and the needle retraction guide groove 4011. The limiting retaining end 623 of the needle retraction retaining member 62 is provided in the second retaining groove 1014-2 so as to move downward and be inserted into the limiting groove 4012 to limit and retain the guide shaft 401.

[0087] In this embodiment, the depth adjustment assembly 2 includes a fixed limiting member 21, a lifting member 22, and a rotating limiting head 23. The fixed limiting member 21 is composed of an integrally formed upper fixing ring 211, an intermediate gear adjusting ring 212, and a bottom locking ring 213 connected in a stepped manner, and the ring diameters of the upper fixing ring 211, the intermediate gear adjusting ring 212, and the bottom locking ring 213 decrease sequentially. The fixed limiting member 21 is used to install with the outer cylinder 1, and at the same time connects the lifting member 22 and the rotating limiting head 23.

[0088] The lifting component 22 is sleeved on the bottom retaining ring 213. The outer wall of the lifting component 22 has an upwardly sloping groove 221. The outer wall of the bottom retaining ring 213 is provided with a slider 2131, which is engaged in the groove 221. The bottom wall of the lifting component 22 has a through hole for the needle tip of the blood collection needle 7 to pass through. The slider 2131 is slidably disposed in the groove 221. When the lifting component 22 is rotated, the slider 2131 can slide along the groove 221, thereby changing the height of the bottom wall of the lifting component 22 and realizing the adjustment of the needle height.

[0089] A rotating limiting head 23 is fitted onto an intermediate gear adjusting ring 212. A locking block 2121 is fixedly installed on the bottom side wall of the intermediate gear adjusting ring 212. An annular inner groove 231 is formed on the inner wall of the rotating limiting head 23, and the locking block 2121 is locked in the annular inner groove 231. The locking block 2121 and the annular inner groove 231 are locked together to limit the installation of the rotating limiting head 23 and the fixed limiting member 21, so that the two do not separate. A limiting guide block 232 is fixedly installed on the inner wall of the rotating limiting head 23, and a vertical groove 222 is formed on the outer wall of the lifting member 22. The limiting guide block 232 is fixedly installed on the inner wall of the rotating limiting head 23. 2. The lifting member 22 is locked in the vertical groove 222. The limiting guide block 232 is locked in the vertical groove 222 to lock the lifting member 22 and the limiting guide block 232. When the fixed limiting member 21 is rotated, the lifting member 22 is driven to rotate. Due to the limitation of the slider 2131, the lifting member 22 moves up and down along the limiting guide block 232 while rotating, thereby ensuring its direction of movement and realizing the adjustment of the up and down position of the lifting member 22. The limiting guide block 232 is set on the lower side of the annular inner groove 231. The bottom wall of the rotating limiting head 23 is also provided with a through hole for the needle tip of the blood collection needle 7 to pass through.

[0090] In this embodiment, a locking protrusion 2111 is provided on the inner wall of the upper fixing ring 211, and a locking groove 105 is provided on the bottom outer wall of the outer cylinder 1. The outer cylinder 1 is inserted into the upper fixing ring 211 and the locking protrusion 2111 is locked and fixed in the locking groove 105 to lock and fix the outer cylinder 1 and the upper fixing limiting member 21. After the locking protrusion 2111 is locked into the locking groove 105, the upper fixing ring 211 and the outer cylinder 1 can be fixedly installed to maintain stable installation.

[0091] A gear adjustment component 2122 is formed on the outer wall of the intermediate gear adjustment ring 212 by a slot. A protrusion 2123 is provided at the movable end of the gear adjustment component 2122. Multiple gear grooves 233 are provided on the inner wall of the rotating limit head 23 that contacts the intermediate gear adjustment ring 212. The protrusion 2123 is engaged in one of the gear grooves 233. A depth indicator strip 234 corresponding to the gear groove 233 is provided on the outer wall of the rotating limit head 23. This design facilitates positioning during rotation. Each gear groove 233 serves as a rotating locking position, facilitating control of the adjustment depth. When adjusted to the appropriate position, the protrusion 2123 engages in the corresponding gear groove 233 for positioning, thus simplifying use. When further adjustment is needed, simply rotate the rotating limit head 23 again to continue adjustment.

[0092] When using the lancing pen in this embodiment:

[0093] Remove the depth adjustment component 2 and insert the blood collection needle 7 into the blood collection needle retainer 402 to fix the blood collection needle 7.

[0094] The needle depth is adjusted by adjusting the depth adjustment component 2. The lifting component 22 is moved up and down by rotating the rotating limit head 23. After adjusting to the appropriate depth, the corresponding protrusion 2123 is locked into the stop groove 233 to fix the position so that no adjustment is needed next time.

[0095] Pressing down on the button 3 causes it to move downwards, compressing the first spring 501. This causes the connecting end 301 to move towards the upper connecting end 403. When they are close together, they are attracted together by magnetic force. When the button 3 is pressed to the bottom, the magnetic force attracts the blood collection needle fixing component 4, thus fixing it in place. Releasing the button 3 causes the first spring 501 to extend, causing the button 3 and the magnetically attracted blood collection needle fixing component 4 to move upwards. At this time, the second spring 502 is compressed, and the third spring 503 is pulled open, thus allowing the button to move upwards when pressed. When the key 3 returns to a sufficiently high position, the magnetic force is insufficient to support the stored force of the second spring 502 and the third spring 503. At this time, the connecting end 301 and the upper connecting end 403 are disconnected. Driven by the reverse elastic force of the second spring 502 and the tensile elastic force of the third spring 503, the blood collection needle fixing assembly 4 moves rapidly downward, thereby driving the blood collection needle 7 out of the needle so that the needle tip 702 passes through the protective sleeve 703 and the depth adjustment assembly 2 to pierce the finger for blood collection. Then, under the action of the second spring 502 and the third spring 503, it retracts again and stops moving after reaching equilibrium.

[0096] Finally, after manually removing the depth adjustment component 2, manually slide the moving button 611 downwards, which will drive the needle withdrawal arm 613 downwards to push the blood collection needle 7 out of the blood collection needle retainer 402. After that, reset the moving button 611, and a new blood collection needle can be used without manually removing the needle, ensuring safety.

[0097] The blood collection pen of the present invention can be used with ordinary blood collection needles on the market, as well as special blood collection needles with soft rubber protection. When using it, you only need to insert the end of the blood collection needle into the blood collection needle retainer 402 to form an interference fit and fix it.

[0098] The specific embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A lancing device that is easy to operate, characterized in that: The device comprises an outer cylinder (1), a depth adjustment assembly (2), a pressing key (3), a blood taking needle fixing assembly (4), and a pressing motor assembly (5) composed of a first spring (501), a second spring (502) and a third spring (503). The depth adjustment assembly (2) is arranged at the bottom of the outer cylinder (1) and is fixedly arranged with the outer cylinder (1). The pressing key (3) is inserted into the outer cylinder (1) and is arranged along the inner wall of the outer cylinder (1) to cooperate with the pressing motor assembly (5) to take out the needle when pressed. The blood taking needle fixing assembly (4) comprises a guide shaft (401), a blood taking needle clamping piece (402) and an upper connecting end (403). The blood taking needle clamping piece (402) and the upper connecting end (403) are fixedly arranged at the bottom and the top of the guide shaft (401), respectively. The inner cylinder top wall of the pressing key (3) is provided with a matching connecting end (301). The matching connecting end (301) can be clamped and fixed after being in contact with the upper connecting end (403). The outer cylinder (1) is fixedly provided with a limiting piece (101). The guide shaft (401) penetrates through the limiting piece (101). The first spring (501), the second spring (502) and the third spring (503) are arranged in the outer cylinder (1). The first spring (501) is arranged between the limiting piece (101) and the top wall of the pressing key (3) and sleeves the guide shaft (401), the upper connecting end (403) and the matching connecting end (301). The second spring (502) is sleeved on the guide shaft (401) and is arranged between the limiting piece (101) and the upper connecting end (403). The third spring is sleeved on the guide shaft (401) and is arranged between the limiting piece (101) and the blood taking needle clamping piece (402). The blood taking needle clamping piece (402) is provided with the blood taking needle (7) in interference clamping. A needle withdrawing assembly (6) is further arranged to pop out the blood taking needle (7) to replace a new blood taking needle (7). The needle withdrawing assembly (6) comprises a needle withdrawing moving piece (61) and a needle withdrawing clamping piece (62). The needle withdrawing moving piece (61) comprises an integrally formed moving button (611), a clamping piece moving arm (612) and a needle withdrawing arm (613). One end of the moving button (611), the clamping piece moving arm (612) and the needle withdrawing arm (613) is fixedly connected as an integral structure through a connecting plate. The clamping piece moving arm (612) is arranged in a Z shape from the free end to the fixed end. The bottom wall shape of the moving button (611) is also arranged in a Z shape and the straight line distance between the moving button (611) and the clamping piece moving arm (612) is consistent. The needle withdrawing clamping piece (62) comprises a clamping block (621) and a circular guide column (622) fixedly arranged at the top of the clamping block (621). A first through groove (6211) is arranged between the clamping block (621) and the circular guide column (622). A second through groove (6212) is arranged at the bottom of the clamping block (621) to form limiting clamping ends (623) at both ends. The card holder moving arm (612) is inserted into the first through slot (622), the round guide column (622) is located between the moving button (611) and the card holder moving arm (612), and the needle withdrawing arm (613) is clamped into the second through slot (6212).

2. The blood lancet according to claim 1, wherein: The inner wall of the outer cylinder (1) is fixedly provided with a clamping piece (103); the pressing key (3) is formed with two symmetrically arranged supporting arms (302) through slotting; the supporting arms (302) are internally provided with through slots (303); and the outer wall of the bottom of the supporting arms (302) is fixedly provided with a protruding clamping block (304).

3. A blood lancet according to claim 2, wherein: The outer wall of the bottom wall of the protruding clamping block (304) is provided in a slope.

4. The blood lancet of claim 1, wherein: The upper connecting end (403) is a cylindrical iron piece, the matching connecting end (301) is a magnet, the inner cylinder top wall of the pressing key (3) is fixedly provided with an embedded fixing piece (305), the magnet is embedded in the embedded fixing piece (305), and the first spring (501) is sleeved outside the embedded fixing piece (305).

5. A blood lancet according to claim 4, wherein: The blood taking needle (7) comprises a handle connecting end (701), a needle head (702) and a protective sleeve (703), the needle head (702) is fixed on the handle connecting end (701), the protective sleeve (703) is sleeved on the needle tip of the needle head (702), and the handle connecting end (701) is clamped and fixed in the blood taking needle clamping piece (402).

6. A blood lancet according to claim 5, wherein: The limiting piece (101) is provided with two first and second limiting rings (1011) and (1012), the first limiting ring (1011) is arranged close to the pressing key (3), the inner wall of the first limiting ring (1011) is fixedly provided with a limiting protruding ring (1013), and the end of the first spring (501) is sleeved on the limiting protruding ring (1013); the second limiting ring (1012) is arranged close to the depth adjusting assembly (2), the second limiting ring (1012) is fixedly provided with a guide cylinder (1014), and the guide cylinder (1014) is arranged towards the first limiting ring (1011). The guide shaft (401) is hollow and communicates with the hollow part of the blood taking needle clamping piece (402), the guide shaft (401) is sleeved in the guide cylinder (1014), the side wall of the guide shaft (401) is provided with a needle withdrawing guide groove (4011) and a limiting groove (4012) communicating with the needle withdrawing guide groove (4011); the guide cylinder (1014) is provided with a first clamping groove (1014-1) and a second clamping groove (1014-2) close to the upper portion of the second limiting ring (1012), the first clamping groove (1014-1) is located on the outer side of the needle withdrawing guide groove (4011), the second spring (502) is sleeved on the guide shaft (401) and arranged between the guide cylinder (1014) and the upper connecting end (403), and the third spring is sleeved on the guide shaft (401) and arranged between the second limiting ring (1012) and the blood taking needle clamping piece (402). The outer wall of the outer cylinder (1) is provided with a button through slot (104), the moving button (611) is located on the outer wall of the outer cylinder (1) and the bottom surface thereof is arranged to slide along the outer cylinder (1), the clamping piece moving arm (612) is inserted into the outer cylinder (1), and the needle withdrawing arm (613) is inserted into the inside of the guide shaft (401) through the first clamping slot (1014-1) and the needle withdrawing guide slot (4011); the limiting clamping end (623) of the needle withdrawing clamping piece (62) is arranged in the second clamping slot (1014-2) so as to be clamped into the limiting slot (4012) downwardly to limit and clamp the guide shaft (401).

7. A lancing device according to claim 4, 5 or 6, wherein: The depth adjusting assembly (2) comprises a fixed limiting piece (21), a lifting piece (22) and a rotating limiting head (23), the fixed limiting piece (21) is composed of an upper fixed ring (211), an intermediate gear adjusting ring (212) and a bottom clamping ring (213) which are integrally arranged and connected in a stepped manner, and the diameters of the rings are gradually reduced in sequence; The lifting piece (22) is sleeved on the bottom clamping ring (213), an obliquely upward sliding groove (221) is formed in the outer wall of the lifting piece (22), a sliding block (2131) is arranged on the outer wall of the bottom clamping ring (213), the sliding block (2131) is clamped in the sliding groove (221), and a through hole is formed in the bottom wall of the lifting piece (22) for the needle tip of the blood taking needle (7) to pass through; The rotating limiting head (23) is sleeved on the intermediate gear adjusting ring (212), a clamping block (2121) is fixedly arranged on the bottom side wall of the intermediate gear adjusting ring (212), an annular inner groove (231) is formed in the inner wall of the rotating limiting head (23), and the clamping block (2121) is clamped in the annular inner groove (231); a limiting guide block (232) is fixedly arranged on the inner wall of the rotating limiting head (23), a vertical groove (222) is formed in the outer wall of the lifting piece (22), the limiting guide block (232) is clamped in the vertical groove (222), the limiting guide block (232) is arranged on the lower side of the annular inner groove (231), and a through hole is also formed in the bottom wall of the rotating limiting head (23) for the needle tip of the blood taking needle (7) to pass through.

8. A blood lancet according to claim 7, wherein: A clamping protrusion (2111) is arranged on the inner wall of the upper fixed ring (211), a clamping recess (105) is formed in the bottom outer wall of the outer cylinder (1), the outer cylinder (1) is inserted into the upper fixed ring (211) and the clamping protrusion (2111) is clamped and fixed in the clamping recess (105), so that the outer cylinder (1) and the upper fixed limiting piece (21) are clamped and fixed. The outer wall of the intermediate gear adjusting ring (212) is formed with a gear adjusting member (2122) through slotting, the movable end of the gear adjusting member (2122) is provided with a protrusion (2123), the inner wall of the rotation limiting head (23) in contact with the intermediate gear adjusting ring (212) is provided with a plurality of gear recesses (233), and the protrusion (2123) is clamped in one of the gear recesses (233); the outer wall of the rotation limiting head (23) is provided with a depth indicating strip (234) corresponding to the gear recess (233).

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