Conveniently operated blood sampling pen

Abstract

The application provides a blood sampling pen convenient to operate, which comprises a fixing cylinder, a button, a rotary positioning key, an inner cylinder, a blood sampling needle fixing assembly and a depth adjusting assembly; the button, the rotary positioning key, the inner cylinder and the blood sampling needle fixing assembly are coaxially arranged in the fixing cylinder, the inner cylinder is fixedly clamped at the bottom of the fixing cylinder, the depth adjusting assembly is installed at the bottom of the inner cylinder and is clamped and fixed with the inner cylinder; the blood sampling needle fixing assembly comprises a guide shaft, an upper connecting end arranged at the top of the guide shaft and a blood sampling needle clamping piece arranged at the bottom of the guide shaft, the guide shaft penetrates through the top wall of the inner cylinder and is arranged, a second spring is fixedly arranged between the top wall of the inner cylinder and the upper connecting end, a third spring is arranged between the top wall of the inner cylinder and the blood sampling needle clamping piece, and a first spring is fixedly arranged between the top wall of the inner cylinder and the bottom end of the rotary positioning key. The application has the advantages of simple structure, convenient production and assembly and use and convenient operation.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and in particular relates to a convenient 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, insert the lancet into the needle slot inside the pen, then attach the adjustable cap to adjust the puncture depth (usually only five depth settings). Pull back the pen barrel to cock it, press the end of the pen cap against a suitable area of ​​the finger or arm, press the button to eject the lancet for blood collection. After collection, unscrew the cap and manually remove and discard the lancet. 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, unscrewing the cap eliminates the need to manually remove the lancet; instead, the needle is removed and discarded using the needle removal mechanism on the pen.

[0004] However, the existing lancing pens have a relatively complex structure and many components, making them troublesome to manufacture and assemble. In addition, when using them, you need to press the button after shifting the needle, which involves many steps and is cumbersome to operate. Summary of the Invention

[0005] The problem this invention aims to solve is to provide a convenient blood collection pen. This pen has a simple structure, making it easy to manufacture, assemble, and use. Its application is simple, eliminating the need for a gear shift; after installing the blood collection needle and adjusting the needle depth, simply press to dispense the needle. It is easy to operate and convenient for various groups of people.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a convenient blood collection pen, including a fixed cylinder, a button, a rotary positioning button, an inner cylinder, a blood collection needle fixing component, and a depth adjustment component; The button, rotary positioning key, inner cylinder and blood collection needle fixing assembly are all coaxially arranged inside the fixing cylinder. The inner cylinder is fixedly clamped at the bottom of the fixing cylinder. The depth adjustment assembly is installed at the bottom of the inner cylinder and is clamped and fixed to the inner cylinder. The button is located on the upper side of the rotary positioning key and is used to drive the rotary positioning key to move down; when the bottom of the button and the top of the rotary positioning key are engaged and in contact, the rotary positioning key can be rotated at a certain angle; the inner wall of the fixed cylinder is provided with a third engaging part to facilitate engaging and fixing the rotary positioning key. The blood collection needle fixing assembly includes a guide shaft, an upper connecting end disposed at the top of the guide shaft, and a blood collection needle engaging component disposed at the bottom of the guide shaft. The guide shaft is disposed through the top wall of the inner cylinder. A second spring is fixedly disposed between the top wall of the inner cylinder and the upper connecting end. A third spring is disposed between the top wall of the inner cylinder and the blood collection needle engaging component. A first spring is fixedly disposed between the top wall of the inner cylinder and the bottom end of the rotary positioning key.

[0007] Furthermore, a protruding ring is provided on the inner wall of the fixed cylinder, and multiple vertical grooves are evenly provided along the circumference of the protruding ring. The bottom of the vertical grooves is open and the four vertical grooves divide the bottom of the protruding ring into multiple parts, each part being configured as a serrated third engaging part. The bottom of the button is provided with a serrated first engaging part, and the bottom circumference of the outer wall of the button is uniformly provided with limiting protrusions of the same number as the vertical grooves, and the limiting protrusions are respectively engaged in the corresponding vertical grooves; the top of the rotary positioning key is provided with a serrated second engaging part, and the outer wall of the rotary positioning key is uniformly provided with second limiting protrusions of the same number as the vertical grooves, and the second limiting protrusions are respectively engaged in the corresponding vertical grooves; the bottom of the second limiting protrusions is connected as a whole by a bottom sealing ring. The first engaging part and the second engaging part are configured to fit each other in shape. During assembly, they are misaligned. The serrated tip of the first engaging part is set directly opposite the serrated inclined surface of the second engaging part. The second engaging part can engage and limit the third engaging part.

[0008] Furthermore, the bottom of the rotary positioning key is hollow and has an adsorption magnet fixedly embedded therein, and the upper connecting end of the blood collection needle fixing assembly is an iron part that can be adsorbed and fixed with the adsorption magnet.

[0009] Furthermore, it also includes a needle withdrawal assembly for withdrawing the blood collection needle. The needle withdrawal assembly includes a needle withdrawal pusher and a sleeve. The needle withdrawal pusher includes a moving horizontal plate, a pressure rod, and a guide post. Pressure rods are fixedly installed at both ends of the top wall of the moving horizontal plate, and a guide post is fixedly installed at the center of the bottom wall of the moving horizontal plate. The sleeve is fixedly sleeved on the guide post. A guide cylinder is coaxially fixed on the top wall of the inner cylinder, and guide grooves are symmetrically opened on the guide cylinder. The movable horizontal plate is inserted into the guide groove. The guide shaft is hollow inside, and the lower half of the guide shaft has symmetrical movable guide grooves on its side wall. The movable horizontal plate is inserted into the movable guide groove and moves up and down along the movable guide groove. The sleeve is set in the internal cavity of the guide shaft. The inner wall of the fixed cylinder is provided with a protruding ring, and multiple sets of vertical grooves are evenly opened around the circumference of the protruding ring. Each set of vertical grooves includes two adjacent vertical grooves, namely the first vertical groove and the second vertical groove. The multiple sets of vertical grooves are arranged symmetrically in pairs, and the first vertical groove and the second vertical groove are staggered. The vertical grooves divide the bottom of the protruding ring into multiple parts. In the same set of vertical grooves, the bottom of the protruding ring between the first vertical groove and the second vertical groove is a running surface. In different sets of vertical grooves, the bottom of the protruding ring between adjacent first vertical grooves and second vertical grooves is a serrated third engagement part or a running surface. The bottom of the button is provided with a serrated first engaging part, and the bottom circumference of the outer wall of the button is uniformly provided with limiting protrusions of the same number as the vertical grooves. The limiting protrusions are engaged in the first vertical grooves of the corresponding vertical grooves. The top of the rotary positioning key is provided with a serrated second engaging part, and the outer wall of the rotary positioning key is symmetrically provided with second limiting protrusions of the same number as the vertical grooves. The second limiting protrusions are respectively engaged in the corresponding vertical grooves, and the bottom of the second limiting protrusions are connected as one piece by a bottom sealing ring. The first and second engaging parts are configured to fit each other in shape. During assembly, they are misaligned, with the serrated tip of the first engaging part facing the serrated slope of the second engaging part. The second engaging part can engage and limit the third engaging part. The rotary positioning key is hollow inside and has multiple sets of push plates fixed downwards. The multiple sets of push plates are fixedly arranged along the inner circumference of the rotary positioning key. An interlocking part is formed between the multiple sets of push plates. An adsorption magnet is fixedly embedded in the interlocking part. The upper connecting end of the blood collection needle fixing assembly is an iron part that can be adsorbed and fixed with the adsorption magnet. Each set of push plates includes two symmetrically arranged half-push plates, and a cavity is formed between adjacent half-push plates. The two pressure rods are arranged opposite a set of push plates or opposite the cavity. The push plates are arranged opposite a set of symmetrical first vertical grooves.

[0010] Furthermore, when the bottom of the protruding ring (101) between the first vertical groove (101-1-1) and the second vertical groove (101-1-2) of adjacent groups of vertical grooves (101-1) is a serrated third engaging part (101-2), the distance between the first vertical groove (101-1-1) and the second vertical groove (101-1-2) of the same group of vertical grooves (101-1) is half the distance between the first vertical groove (101-1-1) and the second vertical groove (101-1-2) of adjacent groups of vertical grooves (101-1).

[0011] Furthermore, when the bottom of the convex ring (101) between the adjacent first vertical groove (101-1-1) and second vertical groove (101-1-2) in different sets of vertical grooves (101-1) is a running surface, there is no third engaging part. At this time, the distance between any two adjacent first vertical grooves (101-1-1) and second vertical grooves (101-1-2) is consistent.

[0012] Furthermore, the bottom inner wall of the fixed cylinder is provided with a plurality of mounting grooves evenly distributed around its circumference to facilitate the installation and locking of the inner cylinder; the mounting groove is a first mounting groove and a second locking groove that are connected vertically, and the first mounting groove forms an opening at the bottom of the fixed cylinder; The inner cylinder is a cylindrical structure with a top wall. A through hole is provided at the center of the top wall of the inner cylinder to facilitate the movement of the guide shaft. The outer wall of the inner cylinder is provided with mounting blocks of the same number as the mounting slots. The width and length of the mounting blocks are matched with the first mounting slot.

[0013] 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. 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. The slider (61-31) 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. 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.

[0014] Furthermore, a limiting groove is provided on the bottom outer wall of the inner cylinder, and a locking protrusion is provided on the inner wall of the upper fixing ring. The upper fixing ring is sleeved on the bottom outer side of the inner cylinder and the locking protrusion is locked in the limiting groove to lock and fix the fixing cylinder and the upper fixing limiting member. 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.

[0015] Furthermore, a first mounting ring groove is provided on the outer wall of the rotary positioning key. The first mounting ring groove is located on the bottom side of the bottom sealing ring. A first sealing ring is sleeved inside the first mounting ring groove to seal the contact point between the rotary positioning key and the fixed cylinder.

[0016] Furthermore, a second mounting ring groove and a third mounting ring groove are provided on the outer wall of the inner cylinder. The second mounting ring groove and the third mounting ring groove are respectively located on the upper side and the lower side of the mounting block. A second sealing ring and a third sealing ring are respectively provided in the second mounting ring groove and the third mounting ring groove, thereby forming a sealing structure between the contact part of the inner cylinder and the fixed cylinder and the contact part of the inner cylinder and the depth adjustment component.

[0017] Furthermore, a fourth mounting ring groove is provided on the side wall of the intermediate gear adjustment ring. The fourth mounting ring groove is located between the locking block and the gear adjustment component. A fourth sealing ring is provided in the fourth mounting ring groove to seal the contact part between the fixed limiting component and the rotating limiting head.

[0018] The advantages and positive effects of this invention are: 1. The blood collection pen of the present invention has a simple structure, is easy to assemble and use; it is easy to use, eliminating the need for a gear shifting step. 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.

[0019] 2. The present invention further provides a needle retraction structure, which, combined with the existing structure, enables the needle retraction function by pressing. The needle can be retracted simply by pressing again, making it convenient and safe to use.

[0020] 3. The present invention further provides a sealing ring, and uses four sealing rings to seal the contact parts between different components, which can improve the sealing of the internal space, thereby further improving the painless effect and facilitating the achievement of painless blood collection. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of the fixed cylinder in Embodiment 1 of the present invention; Figure 3 This is a cross-sectional view of the fixed cylinder in Embodiment 1 of the present invention; Figure 4This is a schematic diagram of the rotary positioning key in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the inner cylinder structure in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the button structure in this invention; Figure 7 This is a split view of the depth adjustment component in Embodiments 1 and 3 of the present invention; Figure 8 These are schematic diagrams of the fixed limiting member in Embodiments 1 and 3 of the present invention; Figure 9 These are schematic diagrams of the rotating limiting head in Embodiments 1 and 3 of the present invention; Figure 10 These are cross-sectional views of the rotating limiting head in Embodiments 1 and 3 of the present invention; Figure 11 This is a schematic diagram of the lifting ring structure in this invention; Figure 12 This is a schematic diagram of the blood collection needle fixation assembly in Embodiment 1 of the present invention; Figure 13 This is a split diagram of Embodiment 2 of the present invention; Figure 14 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention; Figure 15 This is a cross-sectional view of Embodiment 2 of the present invention; Figure 16 This is a schematic diagram of the rotary positioning key in Embodiment 2 of the present invention; Figure 17 This is a schematic diagram of the inner cylinder structure in Embodiment 2 of the present invention; Figure 18 This is a split view of the depth adjustment component in Embodiments 2 and 4 of the present invention; Figure 19 These are schematic diagrams of the fixed limiting member in Embodiments 2 and 4 of the present invention; Figure 20 These are schematic diagrams of the rotating limiting head in Embodiments 2 and 4 of the present invention; Figure 21 These are cross-sectional views of the rotating limiting head in Embodiments 2 and 4 of the present invention; Figure 22 This is a cross-sectional view of Embodiment 3 of the present invention; Figure 23 This is a schematic diagram of the inner cylinder structure in Embodiment 3 of the present invention; Figure 24 This is a schematic diagram of the rotary positioning key in Embodiment 3 of the present invention; Figure 25 This is a bottom view of the rotary positioning key in Embodiment 3 of the present invention; Figure 26 This is a schematic diagram of the structure of the fixed cylinder in Embodiment 3 of the present invention; Figure 27 yes Figure 26 BB section view; Figure 28 This is a split diagram of Embodiment 4 of the present invention; Figure 29 This is a cross-sectional view of Embodiment 4 of the present invention; Figure 30 This is a schematic diagram of the inner cylinder structure in Embodiment 4 of the present invention; Figure 31 This is a schematic diagram of the rotary positioning key in Embodiment 4 of the present invention; Figure 32 These are schematic diagrams of the blood collection needle fixation assembly in Embodiments 4 and 3 of the present invention; In the picture: 1-Fixed cylinder, 101-Protruding ring, 101-1, vertical groove, 101-1-1, first vertical groove, 101-1-2, second vertical groove, 101-2, third engaging part, 102-Mounting groove, 102-1, first mounting groove, 102-2, second engaging groove; 2-Button, 201-First engagement part, 202-Limiting protrusion, 3-Rotary positioning key, 301-Second engaging part, 302-Second limiting protrusion, 303-Bottom sealing ring, 304-First mounting ring groove, 3-1-Push plate, 3-2-Embedding part, 3-3-Cavity; 4-Inner cylinder, 401-Through hole, 402-Mounting block, 403-Limiting groove, 404-Guide cylinder, 405-Guide groove, 406-Second mounting ring groove, 407-Third mounting ring groove; 5-Blood collection needle fixing assembly, 501-Guide shaft, 501-1, Moving guide groove, 502-Upper connecting end, 503-Blood collection needle clamping part; 6-Depth adjustment component; 61-Fixed limit component; 61-1. Upper fixed ring; 61-11. Locking protrusion; 61-2. Middle gear adjustment ring; 61-21. Locking block; 61-22. Gear adjustment component; 61-23. Protrusion; 61-24. Fourth mounting ring groove; 61-3. Bottom locking ring; 61-31. Sliding block; 62-Lifting ring; 62-1. Slide groove; 62-2. Vertical groove; 63-Rotating limit head; 63-1. Annular inner groove; 63-2. Limiting guide block; 63-3. Gear groove; 63-4. Depth indicator bar; 7 - Second spring; 8 - Third spring; 9 - First spring; 10 - Adsorption magnet; 11-Needle retraction assembly, 111-Needle retraction pusher, 111-1-Moving cross plate, 111-2-Pressure rod, 111-3-Guide post, 112-Sleeve; 12-First sealing ring; 13-Second sealing ring; 14-Third sealing ring; 15-Fourth sealing ring; 16-Blood collection needle. Detailed Implementation

[0022] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0023] Example 1: Reference Figure 1 This embodiment provides a convenient blood lancing pen, which is a non-retractable blood lancing pen for normal use. Its specific structure is as follows: A convenient blood lancing pen includes a fixed cylinder 1, a button 2, a rotating positioning key 3, an inner cylinder 4, a blood lancing needle fixing component 5, and a depth adjustment component 6. The fixed cylinder 1 is used to fix and install the other components. Pressing the button 2 downwards causes the rotating positioning key 3 to move downwards, facilitating needle insertion. The inner cylinder 4 is used to install and maintain the balance of the blood lancing needle fixing component 5. The blood lancing needle fixing component 5 is used to fix and install the blood lancing needle 16 for easy use. The depth adjustment component 6 is used to adjust the insertion depth of the blood lancing needle 16 to adapt to the usage habits of different users. The button 2, rotating positioning key 3, inner cylinder 4, and blood lancing needle fixing component 5 are all coaxially arranged inside the fixed cylinder 1. The inner cylinder 4 is fixedly clamped to the bottom of the fixed cylinder 1, and the depth adjustment component 6 is installed at the bottom of the inner cylinder 4 and fixedly clamped to it. Button 2 is located above the rotary positioning key 3 to drive the rotary positioning key 3 downward. The bottom of button 2 and the top of rotary positioning key 3 engage and contact each other, which can drive the rotary positioning key 3 to rotate a certain angle. The inner wall of the fixing cylinder 1 is provided with a third engaging part 101-2 to facilitate the engaging and fixing of the rotary positioning key 3. The engaging structure between button 2 and rotary positioning key 3 is similar to the tooth engaging structure of a ballpoint pen, which can realize rotation and locking, and facilitate the shifting and ejection of the blood collection needle. The blood collection needle fixing assembly 5 includes a guide shaft 501, an upper connecting end 502 located at the top of the guide shaft 501, and a blood collection needle engaging part 503 located at the bottom of the guide shaft 501. The structure of the blood collection needle fixing assembly 5 can be referred to Figure 16 The blood collection needle retainer 503 is used to secure the blood collection needle 16. The guide shaft 501 passes through the top wall of the inner cylinder 4. A second spring 7 is fixedly installed between the top wall of the inner cylinder 4 and the upper connecting end 502. A third spring 8 is installed between the top wall of the inner cylinder 4 and the blood collection needle retainer 503. A first spring 9 is fixedly installed between the top wall of the inner cylinder 4 and the bottom end of the rotary positioning key 3. The first spring 9 stores force after compression, which facilitates the rotary positioning key 3 to return to its original position. The second spring 7 and the third spring 8 are used to maintain the balance of the blood collection needle fixing assembly 5 and realize the functions of needle extension and needle retraction after exiting the station.

[0024] In this embodiment, refer to Figure 2 and Figure 3 A protruding ring 101 is provided on the inner wall of the fixed cylinder 1. The protruding ring 101 is provided with a plurality of vertical grooves 101-1 evenly distributed around the circumference. The bottom of the vertical grooves 101-1 is open and the plurality of vertical grooves 101-1 divide the bottom of the protruding ring 101 into multiple parts. Each part is provided with a serrated third engaging part 101-2. Reference Figure 6 The bottom of button 2 is provided with a serrated first engaging part 201. The bottom circumference of the outer wall of button 2 is evenly provided with limiting protrusions 202 in the same number as the vertical grooves 101-1. The limiting protrusions 202 are respectively engaged in the corresponding vertical grooves 101-1. The top of the rotary positioning key 3 is provided with a serrated second engaging part 301. The outer circumference of the rotary positioning key 3 is evenly provided with second limiting protrusions 302 in the same number as the vertical grooves 101-1. The second limiting protrusions 302 are respectively engaged in the corresponding vertical grooves 101-1. The bottom of the second limiting protrusions 302 is connected as a whole by a bottom sealing ring 303. The vertical grooves 101-1 are provided to limit the button 2 and the rotary positioning key 3, so as to prevent rotation when they move down. In addition, the position of button 2 can be restricted. Under the elastic force of the first spring 9, button 3 abuts against the top wall of the vertical groove 101-1 to achieve balance, thereby ensuring the stability of the installation. The first engaging part 201 and the second engaging part 301 are shaped to fit together. During assembly, they are misaligned, with the serrated tips of the first engaging part 201 facing the serrated slope of the second engaging part 301. The second engaging part 301 can engage and limit the third engaging part 101-2. This arrangement allows the button 2 to be pressed down, causing the rotating positioning key 3 to move downward. When the second limiting protrusion 302 in the rotating positioning key 3 protrudes through the vertical groove 101-1, the serrated tips of the first engaging part 201 slide along the serrated slope of the second engaging part 301, thereby causing the rotating positioning key 3 to rotate at an angle. This allows the second engaging part 301 to engage and fix with the third engaging part 101-2, at which point the gear is engaged. In this embodiment, four vertical grooves 101-1, four limiting protrusions 202 and four second limiting protrusions 302 are selectively provided. Alternatively, other numbers of vertical grooves 101-1, limiting protrusions 202 and second limiting protrusions 302 may be selectively provided.

[0025] In this embodiment, refer to Figure 1 , Figure 12The bottom of the rotary positioning key 3 is hollow and has a fixedly embedded magnetic magnet 10. The upper connecting end 502 of the blood collection needle fixing assembly 5 is made of iron and can be attracted and fixed with the magnetic magnet 10. The magnetic magnet 10 is set so that when the rotary positioning key 3 is pressed for the first time, it moves down and attracts and fixes the blood collection needle fixing assembly 5, thus fixing the two together. This makes it easier to press the button 2 a second time to achieve the purpose of needle dispensing. Specifically, when the button 2 is pressed for the second time, the button 2 presses the rotary positioning key 3, causing the rotary positioning key 3 to rotate a certain angle again, so that the second limiting protrusion 302 of the rotary positioning key 3 is aligned with the vertical groove 101-1. At this time, under the rebound force of the first spring 9, the rotary positioning key 3 is quickly moved upward, and at this time, due to the attraction, the needle is dispensing. The action causes the blood collection needle fixing component 5 to move upward. During this process, the second spring 7 is compressed and the third spring 8 is pulled apart. When it moves up a certain distance, the upper connecting end 502 separates from the adsorption magnet 10. At this time, under the action of the second spring 7 and the third spring 8, the blood collection needle fixing component 5 moves downward rapidly, thereby causing the blood collection needle 16 fixed inside to move downward, so that the needle tip passes through the depth adjustment component 6 to collect blood, thus achieving the purpose of blood collection. After pricking the finger, the blood collection needle fixing component 5 drives the blood collection needle to return to its original position under the combined action of the second spring 7 and the third spring 8, and achieves balance again.

[0026] In this embodiment, refer to Figure 2 and Figure 3 The bottom inner wall of the fixed cylinder 1 is evenly provided with multiple mounting grooves 102 to facilitate the installation and fixing of the inner cylinder 4; the mounting groove 102 is a first mounting groove 102-1 and a second fixing groove 102-2 connected vertically, and the first mounting groove 102-1 forms an opening at the bottom of the fixed cylinder 1. Reference Figure 5 The inner cylinder 4 is a cylindrical structure with a top wall, and its structure can be referred to as follows. Figure 10 A through hole 401 is provided at the center of the top wall of the inner cylinder 4 to facilitate the movement of the guide shaft 501. The outer wall of the inner cylinder 4 is provided with mounting blocks 402 in the same number as the mounting slots 102. The width and length of the mounting blocks 402 match the first mounting slot 102-1. During assembly, the inner cylinder 4 is inserted into the bottom of the fixed cylinder 1. First, the mounting blocks 402 are inserted into the first mounting slot 102-1, then moved upwards into the second locking slot 102-2 and rotated to stably engage the mounting blocks 402 into the second locking slot 102-2, thus fixing the inner cylinder 4 onto the fixed cylinder 1 for stable fixation. In this embodiment, four mounting slots 102 and four mounting blocks 402 are specifically provided. However, different numbers of mounting slots 102 and mounting blocks 402 can be selected for production depending on the ease of manufacturing.

[0027] In this embodiment, refer to Figures 7-11 The depth adjustment assembly 6 includes a fixed limiting component 61, a lifting component 62, and a rotating limiting head 63. The fixed limiting component 61 is composed of an integrally formed upper fixing ring 61-1, an intermediate gear adjusting ring 61-2, and a bottom locking ring 61-3 connected in a stepped manner, with the ring diameters of the upper fixing ring 61-1, the intermediate gear adjusting ring 61-2, and the bottom locking ring 61-3 decreasing sequentially. The fixed limiting component 61 is used to fix and install itself to the inner cylinder 4, and at the same time connects the lifting component 62 to the rotating limiting head 23. The lifting component 62 is sleeved on the bottom retaining ring 61-3. The outer wall of the lifting component 62 has an upwardly sloping groove 62-1. The outer wall of the bottom retaining ring 61-3 is provided with a slider 61-31, which is engaged in the groove 62-1. The bottom wall of the lifting component 62 has a through hole for the needle tip of the blood collection needle 16 to pass through. The slider 21-31 is slidably disposed in the groove 22-1. When the lifting component 22 is rotated, the slider 21-31 can slide along the groove 22-1, thereby changing the height of the bottom wall of the lifting component 22 and realizing the adjustment of the needle height. A rotating limiting head 63 is fitted onto an intermediate gear adjusting ring 61-2. A locking block 61-21 is fixedly installed on the bottom side wall of the intermediate gear adjusting ring 61-2. An annular inner groove 63-1 is formed on the inner wall of the rotating limiting head 63, and the locking block 61-21 is locked in the annular inner groove 63-1. The locking block 21-21 is locked and connected to the annular inner groove 23-1 to limit the installation of the rotating limiting head 23 and the fixed limiting component 21, so that the two do not separate. A limiting guide block 63-2 is fixedly installed on the inner wall of the rotating limiting head 63, and a vertical groove 62-2 is formed on the outer wall of the lifting component 62. The limiting guide block 63-2 is fixedly installed on the inner wall of the rotating limiting head 63. 3-2 is installed in the vertical groove 62-2, and the limiting guide block 23-2 is installed in the vertical groove 22-2 to lock the lifting member 22 with the limiting guide block 23-2. When the fixed limiting member 21 is rotated, the lifting member 22 is driven to rotate. Due to the restriction of the slider 21-31, the lifting member 22 moves up and down along the limiting guide block 23-2 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 63-2 is set on the lower side of the annular inner groove 63-1. The bottom wall of the rotating limiting head 63 is also provided with a through hole for the needle tip of the blood collection needle to pass through.

[0028] In this embodiment, refer to Figure 5 and Figure 8 A limiting groove 403 is provided on the bottom outer wall of the inner cylinder 4, and a locking protrusion 61-11 is provided on the inner wall of the upper fixing ring 61-1. The upper fixing ring 61-1 is sleeved on the bottom outer side of the inner cylinder 4 and the locking protrusion 61-11 is locked in the limiting groove 403 to lock and fix the fixing cylinder 1 and the upper fixing limiting member 21. A gear adjustment component 61-22 is formed on the outer wall of the intermediate gear adjustment ring 61-2 by a slot. A protrusion 61-23 is provided at the movable end of the gear adjustment component 61-22. Multiple gear grooves 63-3 are provided on the inner wall of the rotating limit head 63 that contacts the intermediate gear adjustment ring 61-2. The protrusion 61-23 is engaged in one of the gear grooves 63-3. A depth indicator strip 63-4 corresponding to the gear groove 63-3 is provided on the outer wall of the rotating limit head 63. This design facilitates positioning during rotation. Each gear groove 23-3 serves as a rotating locking position, facilitating control of the adjustment depth. When adjusted to the appropriate position, the protrusion 21-23 engages in the corresponding gear groove 23-3 for positioning, thus simplifying use. When further adjustment is needed, simply rotate the rotating limit head 23 again to continue adjustment.

[0029] The blood collection pen in this embodiment is operated as follows: First, remove the depth adjustment component 6, insert the blood collection needle 16 into the blood collection needle retainer 503 to fix the blood collection needle 16, and then install the depth adjustment component 6. Secondly, the needle depth is adjusted by adjusting the depth adjustment component 6, and the lifting component 22 is moved up and down by rotating the rotating limit head 23. After adjusting to the appropriate depth, the corresponding protrusions 21-23 are locked into the stop groove 23-3 to fix the position so that no adjustment is needed next time. Then, press down button 2, and button 2 moves vertically downward. At this time, it drives the rotating positioning key 3 to move downward. When the second limiting protrusion 302 in the rotating positioning key 3 passes through the vertical groove 101-1, the serrated tip of the first engaging part 201 slides along the serrated inclined surface of the second engaging part 301, thereby causing the rotating positioning key 3 to rotate at an angle, so that the second engaging part 301 and the third engaging part 101-2 are engaged and fixed. At this time, the upper part is engaged and the magnet 10 is attracted to fix the blood collection needle fixing component 5, thereby fixing it together. Then, the second press of button 2 is used to draw blood: button 2 presses the rotating positioning key 3, causing the rotating positioning key 3 to rotate a certain angle again, so that the second limiting protrusion 302 of the rotating positioning key 3 is aligned with the vertical groove 101-1. At this time, under the rebound force of the first spring 9, the rotating positioning key 3 is quickly moved upward. At this time, due to the adsorption effect, the blood collection needle fixing component 5 is moved upward as well. During this process, the second spring 7 is compressed and the third spring 8 is pulled open. When it moves up a certain distance, the upper connecting end 502 separates from the adsorption magnet 10. At this time, under the action of the second spring 7 and the third spring 8, the blood collection needle fixing component 5 is quickly moved downward, thereby moving the internally fixed blood collection needle 16 downward, so that the needle tip passes through the depth adjustment component 6 to draw blood, achieving the purpose of blood collection. After pricking the finger, the blood collection needle fixing component 5 moves the blood collection needle back to its original position under the cooperation of the second spring 7 and the third spring 8, and balance is achieved again. Finally, remove the depth adjustment component 6, manually remove and discard the lancet 16, and then reinstall the depth adjustment component 6. Repeat the above steps for subsequent use.

[0030] Example 2: Reference Figure 13-21 This embodiment provides a negative pressure painless blood collection pen, which adds a sealing device based on embodiment 1. The sealing device includes a first sealing ring 12, a second sealing ring 13, a third sealing ring 14, and a fourth sealing ring 15, thereby achieving the purpose of painless blood collection. The specific positions of the four sealing rings are as follows: In this embodiment, refer to Figure 16 The outer wall of the rotary positioning key 3 is provided with a first mounting ring groove 304. The first mounting ring groove 304 is located on the bottom side of the bottom sealing ring 303. A first sealing ring 12 is fitted inside the first mounting ring groove 304 to seal the contact point between the rotary positioning key 3 and the fixed cylinder 1.

[0031] In this embodiment, refer to Figure 17 The outer wall of the inner cylinder 4 is provided with a second mounting ring groove 406 and a third mounting ring groove 407. The second mounting ring groove 406 and the third mounting ring groove 407 are respectively located on the upper side and the lower side of the mounting block 402. The second mounting ring groove 406 and the third mounting ring groove 407 are respectively provided with a second sealing ring 13 and a third sealing ring 14, thereby forming a sealing structure between the contact part of the inner cylinder 4 and the fixed cylinder 1 and the contact part of the inner cylinder 4 and the depth adjustment component 6.

[0032] In this embodiment, refer to Figure 18 and Figure 19 as well as Figure 20 and 21A fourth mounting groove 61-24 is provided on the side wall of the intermediate gear adjustment ring 61-2. The fourth mounting groove 61-24 is located between the locking block 61-21 and the gear adjustment component 61-22. A fourth sealing ring 15 is provided in the fourth mounting groove 61-24 to seal the contact part between the fixed limiting component 61 and the rotating limiting head 63. By setting the first sealing ring 12, the second sealing ring 13, the third sealing ring 14 and the fourth sealing ring 15, the space inside the blood collection pen is sealed, thereby creating a vacuum inside when the button 2 is moved down, which sucks up a small bump on the skin, thus achieving painless blood collection when the needle is withdrawn. In this embodiment, by setting four sealing rings to seal different connection structures, its sealing effect is better than that of the painless blood collection pen in the prior art, and it can truly achieve painless blood collection.

[0033] The specific operation and principle of this embodiment are the same as those of Embodiment 1.

[0034] Example 3: Reference Figure 3 This embodiment provides a convenient blood lancing pen, which is a normally usable retractable needle type blood lancing pen. Based on Embodiment 1, it adds a needle retraction structure. Its specific structure is as follows: A convenient blood lancing pen includes a fixed cylinder 1, a button 2, a rotating positioning key 3, an inner cylinder 4, a blood lancing needle fixing component 5, and a depth adjustment component 6. The fixed cylinder 1 is used to fix and install the other structures. Pressing the button 2 downward will drive the rotating positioning key 3 to move downward to facilitate needle dispensing. The inner cylinder 4 is used to install the blood lancing needle fixing component 5 and maintain its balance. The blood lancing needle fixing component 5 is used to fix and install the blood lancing needle 16 for easy use. The depth adjustment component 6 is used to adjust the needle dispensing depth of the blood lancing needle 16 to adapt to the usage habits of different people. Button 2, rotary positioning key 3, inner cylinder 4 and blood collection needle fixing assembly 5 are all coaxially arranged inside the fixed cylinder 1. The inner cylinder 4 is fixedly clamped at the bottom of the fixed cylinder 1. The depth adjustment assembly 6 is installed at the bottom of the inner cylinder 4 and is clamped and fixed to the inner cylinder 4. Button 2 is located on the upper side of the rotary positioning key 3 to drive the rotary positioning key 3 to move downward; the bottom of button 2 and the top of rotary positioning key 3 are provided with interlocking teeth, and the inner wall of the inner cylinder 4 is provided with inner teeth 401 to facilitate locking and fixing the rotary positioning key 3; the meshing structure between button 2 and rotary positioning key 3 is similar to the tooth meshing structure of a ballpoint pen, which can realize rotation and locking, and facilitate shifting and dispensing the blood collection needle; The blood collection needle fixing assembly 5 includes a guide shaft 501, an upper connecting end 502 disposed at the top of the guide shaft 501, and a blood collection needle retainer 503 disposed at the bottom of the guide shaft 501. The structure of the blood collection needle fixing assembly 5 can be referred to Figure 16The blood collection needle retainer 503 is used to secure the blood collection needle 16. The guide shaft 501 passes through the top wall of the inner cylinder 4. A second spring 7 is fixedly installed between the top wall of the inner cylinder 4 and the upper connecting end 502. A third spring 8 is installed between the top wall of the inner cylinder 4 and the blood collection needle retainer 503. A first spring 9 is fixedly installed between the top wall of the inner cylinder 4 and the bottom end of the rotary positioning key 3. The first spring 9 stores force after compression, which facilitates the rotary positioning key 3 to return to its original position. The second spring 7 and the third spring 8 are used to maintain the balance of the blood collection needle fixing assembly 5 and realize the functions of needle extension and needle retraction after exiting the station.

[0035] In this embodiment, refer to Figure 26A protruding ring 101 is provided inwardly on the inner wall of the fixed cylinder 1. Multiple sets of vertical grooves 101-1 are evenly distributed around the circumference of the protruding ring 101. Each set of vertical grooves 101-1 includes two adjacent vertical grooves, namely a first vertical groove 101-1-1 and a second vertical groove 101-1-2. The first vertical grooves 101-1-1 and the second vertical grooves 101-1-2 in the multiple sets of vertical grooves 101-1 are staggered. The vertical grooves 101-1 divide the bottom of the protruding ring 101 into multiple parts. The bottom of the protruding ring 101 between the first vertical groove 101-1-1 and the second vertical groove 101-1-2 in the same set of vertical grooves 101-1 forms a running surface. Different sets of vertical grooves 101-1... In section 1-1, the bottom of the convex ring 101 between adjacent first vertical grooves 101-1-1 and second vertical grooves 101-1-2 is a serrated third engaging portion 101-2; wherein, the distance between the first vertical groove 101-1-1 and second vertical groove 101-1-2 in the same group of vertical grooves 101-1 is half the distance between adjacent first vertical grooves 101-1-1 and second vertical grooves 101-1-2 in different groups of vertical grooves 101-1; this setting facilitates that when button 2 is used, the first press of button 2 is used to engage the third engaging portion 101-2, and the second press of button 2 is used to disengage the needle, allowing the rotating positioning key 3 to move along the first vertical groove 101-1-1-1-2-1. The second vertical groove 101-1-2 returns the needle out. Pressing button 2 a third time retracts the needle. Pressing it all the way down will cause the needle retraction assembly 11 to retract the blood collection needle 16. Since the needle retraction is performed by pressing three times, the multiple sets of vertical grooves 101-1 can be specifically set to three sets, six sets, or other combinations, as long as the angle of their meshing sawtooth shape matches. In addition, the distance between the first vertical groove 101-1-1 and the second vertical groove 101-1-2 in the same set of vertical grooves 101-1 is half the distance between adjacent first vertical grooves 101-1-1 and second vertical grooves 101-1-2 in different sets of vertical grooves 101-1. The half here is not a straight line. The distance of half the apparent spacing is merely one way of expressing the rotation angle. In actual use, the first press is sufficient to rotate the positioning key 3 out of the first vertical groove 101-1-1, thus engaging with the third engaging part 101-2. The second press rotates the positioning key 3 again, moving it upward from the second vertical groove 101-1-2. The third press directly retracts the needle and moves it back into the next first vertical groove 101-1-1, thus achieving the coordinated operation of needle insertion and retraction. Specifically, the distance between the first vertical groove 101-1-1 and the second vertical groove 101-1-2 is matched with the rotation angle of the locking teeth of the third engaging part 101-2.

[0036] Reference Figure 6The bottom of button 2 is provided with a serrated first engaging portion 201. The bottom circumference of the outer wall of button 2 is evenly provided with limiting protrusions 202, the same number as the vertical grooves 101-1. The limiting protrusions 202 are engaged within the first vertical grooves 101-1-1 in the corresponding vertical grooves 101-1. The top of rotary positioning key 3 is provided with a serrated second engaging portion 301. The outer wall of rotary positioning key 3 is symmetrically provided with second limiting protrusions 302, the same number as the vertical grooves 101-1. The second limiting protrusions 302 are respectively engaged within the corresponding vertical grooves 101-1-1. Within 1, specifically, multiple second limiting protrusions 302 are simultaneously engaged in multiple first vertical grooves 101-1-1, or simultaneously engaged in multiple second vertical grooves 101-1-2; the bottom of the second limiting protrusions 302 is connected as one piece by a bottom sealing ring 303; the vertical groove 101-1 is provided to limit the button 2 and the rotary positioning key 3, thereby preventing rotation when they move downwards. In addition, it can limit the position of the button 2. Under the elastic force of the first spring 9, the button 3 abuts against the top wall of the vertical groove 101-1 to achieve balance, thereby ensuring the stability of the installation; The first engaging part 201 and the second engaging part 301 are shaped to fit together. During assembly, they are misaligned, with the serrated tips of the first engaging part 201 facing the serrated slope of the second engaging part 301. The second engaging part 301 can engage and limit the third engaging part 101-2. This arrangement allows the button 2 to be pressed down, causing the rotating positioning key 3 to move downwards. When the second limiting protrusion 302 in the rotating positioning key 3 passes through the first vertical groove 101-1-1 in the vertical groove 101-1, the serrated tips of the first engaging part 201 slide along the serrated slope of the second engaging part 301, thereby causing the rotating positioning key 3 to rotate at an angle. This allows the second engaging part 301 to engage and fix with the third engaging part 101-2, at which point the gear is engaged; pressing the button again... When button 2 is pressed, the rotating positioning button 3 is rotated again. At this time, the second limiting protrusion 302 is directly opposite to the second vertical groove 101-1-2 in the second set of vertical grooves 101-1. It then moves upward along the second vertical groove 101-1-2 and the needle is released. When button 2 is pressed for the third time, the rotating positioning button 3 is rotated. After rotating a certain angle, the rotating positioning button 3 is directly opposite to the first vertical groove 101-1-1 in the second set of vertical grooves 101-1. It then moves upward along the first vertical groove 101-1-1 and returns to its original position.

[0037] Additionally, refer to Figure 22In this embodiment, a needle withdrawal assembly 11 is also provided to withdraw the blood collection needle. The needle withdrawal assembly 11 includes a needle withdrawal pusher 111 and a sleeve 112. The needle withdrawal pusher 111 includes a movable horizontal plate 111-1, a pressure rod 111-2 and a guide post 111-3. The pressure rod 111-2 is fixedly provided at both ends of the top wall of the movable horizontal plate 111-1, and the guide post 111-3 is fixedly provided at the center of the bottom wall of the movable horizontal plate 111-1. The sleeve 112 is fixedly sleeved on the guide post 111-3. Reference Figure 23 A guide cylinder 404 is coaxially fixed on the top wall of the inner cylinder 4. Guide grooves 405 are symmetrically opened on the guide cylinder 404. The movable horizontal plate 111-1 is inserted into the guide groove 405. Reference Figure 32 The guide shaft 501 is hollow inside, and the lower half of the guide shaft 501 has symmetrical movable guide grooves 501-1 on its side wall. The movable horizontal plate 111-1 is inserted into the movable guide groove 501-1 and moves up and down along the movable guide groove 501-1. The sleeve 112 is set in the internal cavity of the guide shaft 501. Reference Figure 24 and 25The rotary positioning key 3 is hollow inside and has multiple sets of push plates 3-1 fixedly arranged downwards. These push plates 3-1 are fixedly arranged along the circumference of the inner wall of the rotary positioning key 3. A fitting part 3-2 is formed between the push plates 3-1, and an adsorption magnet 10 is fixedly embedded in the fitting part. The upper connecting end 502 of the blood collection needle fixing assembly 5 is made of iron and can be adsorbed and fixed with the adsorption magnet 10. The adsorption magnet 10 is provided so that when the button 2 is pressed for the first time, the rotary positioning key 3 moves downwards, and the adsorption magnet 10 adsorbs and fixes the blood collection needle fixing assembly 5, thus fixing the two together. This facilitates the needle dispensing purpose when the button 2 is pressed a second time. Specifically, when the button 2 is pressed a second time, the button 2 presses the rotary positioning key 3, causing the rotary positioning key 3 to rotate again by a certain angle, thereby facilitating the rotation positioning... The second limiting protrusion 302 of key 3 is directly opposite the vertical groove 101-1. At this time, under the rebound force of the first spring 9, the rotating positioning key 3 is quickly moved upward. At this time, due to the adsorption effect, the blood collection needle fixing component 5 is moved upward. During this process, the second spring 7 is compressed and the third spring 8 is pulled apart. When it moves up a certain distance, the upper connecting end 502 separates from the adsorption magnet 10. At this time, under the action of the second spring 7 and the third spring 8, the blood collection needle fixing component 5 is quickly moved downward, thereby moving the internally fixed blood collection needle 16 downward, so that the needle tip passes through the depth adjustment component 6 to collect blood, thus achieving the purpose of blood collection. After pricking the finger, the blood collection needle fixing component 5 moves the blood collection needle back to its original position under the cooperation of the second spring 7 and the third spring 8, and balance is achieved again. Each set of push plates 3-1 includes two symmetrically arranged half-push plates, with a cavity 3-3 formed between adjacent half-push plates. Two pressure rods 111-2 are positioned opposite either a set of push plates 3-1 or the cavity 3-3. The push plates 3-1 are positioned opposite a set of symmetrical first vertical grooves 101-1-1. In actual use, after the blood collection needle 16 returns to its original position after blood collection, pressing button 2 again (the third time) moves it down to rotate the rotation positioning key 3 by a certain angle. At this time, the pressure rod 111-2 changes from being opposite the cavity 3-3 to being opposite the push plate 3-1. Thus, when the rotation positioning key 3 moves down, it drives the needle retraction assembly 11 to move down, and the sleeve 112 moves down and enters the blood collection needle retainer 503, knocking out the blood collection needle inside, thereby achieving the purpose of needle retraction.

[0038] In this embodiment, a plurality of mounting grooves 102 are evenly arranged on the circumference of the bottom inner wall of the fixed cylinder 1 to facilitate the installation and locking of the inner cylinder 4; the mounting grooves 102 are connected vertically to the first mounting groove 102-1 and the second locking groove 102-2, and the first mounting groove 102-1 forms an opening at the bottom of the fixed cylinder 1. The inner cylinder 4 is a cylindrical structure with a top wall, and its structure can be referred to as follows. Figure 19A through hole 401 is provided at the center of the top wall of the inner cylinder 4 to facilitate the movement of the guide shaft 501. Multiple mounting blocks 402 are arranged circumferentially on the outer wall of the inner cylinder 4. The width and length of the mounting blocks 402 match the first mounting groove 102-1. During assembly, the inner cylinder 4 is inserted into the bottom of the fixed cylinder 1. First, the mounting blocks 402 are inserted into the first mounting groove 102-1, then moved upwards into the second locking groove 102-2 and rotated to stably engage the mounting blocks 402 into the second locking groove 102-2, thereby fixing the inner cylinder 4 onto the fixed cylinder 1 and ensuring stable fixation.

[0039] In this embodiment, refer to Figure 7-11 The depth adjustment assembly 6 includes a fixed limiting component 61, a lifting component 62, and a rotating limiting head 63. The fixed limiting component 61 is composed of an integrally formed upper fixing ring 61-1, an intermediate gear adjusting ring 61-2, and a bottom locking ring 61-3 connected in a stepped manner, with the ring diameters of the upper fixing ring 61-1, the intermediate gear adjusting ring 61-2, and the bottom locking ring 61-3 decreasing sequentially. The fixed limiting component 61 is used to fix and install itself to the inner cylinder 4, and at the same time connects the lifting component 62 to the rotating limiting head 23. The lifting component 62 is sleeved on the bottom retaining ring 61-3. The outer wall of the lifting component 62 has an upwardly sloping groove 62-1. The outer wall of the bottom retaining ring 61-3 is provided with a slider 61-31, which is engaged in the groove 62-1. The bottom wall of the lifting component 62 has a through hole for the needle tip of the blood collection needle to pass through. The slider 21-31 is slidably disposed in the groove 22-1. When the lifting component 22 is rotated, the slider 21-31 can slide along the groove 22-1, thereby changing the height of the bottom wall of the lifting component 22 and realizing the adjustment of the needle height. A rotating limiting head 63 is fitted onto an intermediate gear adjusting ring 61-2. A locking block 61-21 is fixedly installed on the bottom side wall of the intermediate gear adjusting ring 61-2. An annular inner groove 63-1 is formed on the inner wall of the rotating limiting head 63, and the locking block 61-21 is locked in the annular inner groove 63-1. The locking block 21-21 is locked and connected to the annular inner groove 23-1 to limit the installation of the rotating limiting head 23 and the fixed limiting component 21, so that the two do not separate. A limiting guide block 63-2 is fixedly installed on the inner wall of the rotating limiting head 63, and a vertical groove 62-2 is formed on the outer wall of the lifting component 62. The limiting guide block 63-2 is fixedly installed on the inner wall of the rotating limiting head 63. 3-2 is installed in the vertical groove 62-2, and the limiting guide block 23-2 is installed in the vertical groove 22-2 to lock the lifting member 22 with the limiting guide block 23-2. When the fixed limiting member 21 is rotated, the lifting member 22 is driven to rotate. Due to the restriction of the slider 21-31, the lifting member 22 moves up and down along the limiting guide block 23-2 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 63-2 is set on the lower side of the annular inner groove 63-1. The bottom wall of the rotating limiting head 63 is also provided with a through hole for the needle tip of the blood collection needle to pass through.

[0040] In addition, in this embodiment, a limiting groove 403 is provided on the bottom outer wall of the inner cylinder 4, and a locking protrusion 61-11 is provided on the inner wall of the upper fixing ring 61-1. The upper fixing ring 61-1 is sleeved on the bottom outer side of the inner cylinder 4 and the locking protrusion 61-11 is locked in the limiting groove 403 to lock and fix the fixing cylinder 1 and the upper fixing limiting member 21. A gear adjustment component 61-22 is formed on the outer wall of the intermediate gear adjustment ring 61-2 by a slot. A protrusion 61-23 is provided at the movable end of the gear adjustment component 61-22. Multiple gear grooves 63-3 are provided on the inner wall of the rotating limit head 63 that contacts the intermediate gear adjustment ring 61-2. The protrusion 61-23 is engaged in one of the gear grooves 63-3. A depth indicator strip 63-4 corresponding to the gear groove 63-3 is provided on the outer wall of the rotating limit head 63. This design facilitates positioning during rotation. Each gear groove 23-3 serves as a rotating locking position, facilitating control of the adjustment depth. When adjusted to the appropriate position, the protrusion 21-23 engages in the corresponding gear groove 23-3 for positioning, thus simplifying use. When further adjustment is needed, simply rotate the rotating limit head 23 again to continue adjustment.

[0041] The blood collection pen of this embodiment is operated as follows: First, remove the depth adjustment component 6, insert the blood collection needle 16 into the blood collection needle retainer 503 to fix the blood collection needle 16, and then install the depth adjustment component 6. Secondly, the needle depth is adjusted by adjusting the depth adjustment component 6, and the lifting component 22 is moved up and down by rotating the rotating limit head 23. After adjusting to the appropriate depth, the corresponding protrusions 21-23 are locked into the stop groove 23-3 to fix the position so that no adjustment is needed next time. Then, press down button 2, and button 2 moves vertically downward. At this time, it drives the rotating positioning key 3 to move downward. When the second limiting protrusion 302 in the rotating positioning key 3 passes through the vertical groove 101-1, the serrated tip of the first engaging part 201 slides along the serrated inclined surface of the second engaging part 301, thereby causing the rotating positioning key 3 to rotate at an angle, so that the second engaging part 301 and the third engaging part 101-2 are engaged and fixed. At this time, the upper part is engaged and the magnet 10 is attracted to fix the blood collection needle fixing component 5, thereby fixing the two together. Then, the second press of button 2 is used to draw blood: button 2 presses the rotating positioning key 3, causing the rotating positioning key 3 to rotate a certain angle again, so that the second limiting protrusion 302 of the rotating positioning key 3 is aligned with the vertical groove 101-1. At this time, under the rebound force of the first spring 9, the rotating positioning key 3 is quickly moved upward. At this time, due to the adsorption effect, the blood collection needle fixing component 5 is moved upward as well. During this process, the second spring 7 is compressed and the third spring 8 is pulled open. When it moves up a certain distance, the upper connecting end 502 separates from the adsorption magnet 10. At this time, under the action of the second spring 7 and the third spring 8, the blood collection needle fixing component 5 is quickly moved downward, thereby moving the internally fixed blood collection needle 16 downward, so that the needle tip passes through the depth adjustment component 6 to draw blood, achieving the purpose of blood collection. After pricking the finger, the blood collection needle fixing component 5 moves the blood collection needle back to its original position under the cooperation of the second spring 7 and the third spring 8, and balance is achieved again. Finally, remove the depth adjustment component 6. Press button 2 for the third time to move it down and up, rotating the positioning key 3 by a certain angle. At this time, the pressure rod 111-2 is aligned with the push plate 3-1. When the positioning key 3 moves down, it will drive the needle retraction component 11 down, thereby moving the sleeve 112 down and into the blood collection needle retainer 503, thus ejecting the blood collection needle and achieving the purpose of needle retraction. After that, reinstall the depth adjustment component 6. Repeat the above operation for subsequent use. When pressing button 2 for the first two times, the pressure rod 111-2 directly enters the cavity 3-3, so there will be no situation where the needle retraction component 11 is pressed and misoperation occurs.

[0042] Example 4: Reference Figure 28-31This embodiment provides a negative pressure painless blood collection pen with retractable needle, which achieves painless blood collection during use and has an automatic needle retraction function. Its specific structure is based on Embodiment 3 with the addition of a sealing device. This sealing device includes a first sealing ring 12, a second sealing ring 13, a third sealing ring 14, and a fourth sealing ring 15, thereby achieving painless blood collection. The specific positions of the four sealing rings are as follows: In this embodiment, refer to Figure 31 The outer wall of the rotary positioning key 3 is provided with a first mounting ring groove 304. The first mounting ring groove 304 is located on the bottom side of the bottom sealing ring 303. A first sealing ring 12 is fitted inside the first mounting ring groove 304 to seal the contact point between the rotary positioning key 3 and the fixed cylinder 1.

[0043] In this embodiment, refer to Figure 30 The outer wall of the inner cylinder 4 is provided with a second mounting ring groove 406 and a third mounting ring groove 407. The second mounting ring groove 406 and the third mounting ring groove 407 are respectively located on the upper side and the lower side of the mounting block 402. The second mounting ring groove 406 and the third mounting ring groove 407 are respectively provided with a second sealing ring 13 and a third sealing ring 14, thereby forming a sealing structure between the contact part of the inner cylinder 4 and the fixed cylinder 1 and the contact part of the inner cylinder 4 and the depth adjustment component 6.

[0044] In this embodiment, refer to Figure 19-21 A fourth mounting groove 61-24 is provided on the side wall of the intermediate gear adjustment ring 61-2. The fourth mounting groove 61-24 is located between the locking block 61-21 and the gear adjustment component 61-22. A fourth sealing ring 15 is provided in the fourth mounting groove 61-24 to seal the contact part between the fixed limiting component 61 and the rotating limiting head 63. By setting the first sealing ring 12, the second sealing ring 13, the third sealing ring 14 and the fourth sealing ring 15, the space inside the blood collection pen is sealed, thereby creating a vacuum inside when the button 2 is moved down, which sucks up a small bump on the skin, thus achieving painless blood collection when the needle is withdrawn. In this embodiment, by setting four sealing rings to seal different connection structures, its sealing effect is better than that of the painless blood collection pen in the prior art, and it can truly achieve painless blood collection.

[0045] The specific operation and blood collection principle of this embodiment are the same as those in Embodiment 3.

[0046] Example 5: Based on embodiment 3, the bottom of the convex ring 101 between adjacent first vertical groove 101-1-1 and second vertical groove 101-1-2 in different sets of vertical grooves 101-1 can be set as a running surface. This running surface is the same as the running surface of the bottom of the convex ring 101 between the first vertical groove 101-1-1 and second vertical groove 101-1-2 in the same set of vertical grooves 101-1. That is, it is only necessary to realize that when pressed, the rotating positioning key 3 rotates and its rotation angle cooperates with the first vertical groove 101-1-1 and the second vertical groove 101-1-2 to realize the up and down locking movement. That is, the first press causes the needle to be extended and then returns to its original position. The second press causes the needle to be retracted and then returns to its original position. At this time, there is no third locking part, which eliminates the upper step. The needle is directly extended by pressing and retracted by pressing again. At the same time, the vertical grooves 101-1 in this embodiment do not need to be set to a multiple of 3 groups. They can be set to an even number of groups such as 2 or 4 groups for normal use.

[0047] This embodiment omits the previous steps, and its specific operation during use is as follows: First, remove the depth adjustment component 6, insert the blood collection needle 16 into the blood collection needle retainer 503 to fix the blood collection needle 16, and then install the depth adjustment component 6. Secondly, the needle depth is adjusted by adjusting the depth adjustment component 6, and the lifting component 22 is moved up and down by rotating the rotating limit head 23. After adjusting to the appropriate depth, the corresponding protrusions 21-23 are locked into the stop groove 23-3 to fix the position so that no adjustment is needed next time. Then, press down button 2, and button 2 moves vertically downward. At this time, it drives the rotating positioning key 3 to move downward. When the second limiting protrusion 302 in the rotating positioning key 3 passes through the first vertical groove 10-1-1 in the vertical groove 101-1, the serrated tip of the first engaging part 201 slides along the serrated inclined surface of the second engaging part 301, thereby causing the rotating positioning key 3 to rotate at an angle, so that the second limiting protrusion 302 of the rotating positioning key 3 is directly opposite to the second vertical groove 101-1-2 in the vertical groove 101-1. Therefore, button 2 also has a pressing function at this time, and at this time, the magnetic magnet 10 fixes and attracts the blood collection needle fixing component 5, thereby fixing the two together. Then, quickly release button 2. At this time, the second limit protrusion 302 of the rotating positioning button 3 is aligned with the second vertical groove 101-1-2 of the vertical groove 101-1. Under the action of the rebound force of the first spring 9, the rotating positioning button 3 is quickly moved upward. At this time, due to the adsorption effect, the blood collection needle fixing component 5 is moved upward. During this process, the second spring 7 is compressed and the third spring 8 is pulled open. When it moves up a certain distance, the upper connecting end 502 separates from the adsorption magnet 10. Then, under the action of the second spring 7 and the third spring 8, the blood collection needle fixing component 5 is quickly moved downward, thereby moving the internally fixed blood collection needle 16 downward, so that the needle tip passes through the depth adjustment component 6 to collect blood, achieving the purpose of blood collection. After pricking the finger, the blood collection needle fixing component 5 moves the blood collection needle back to its original position under the cooperation of the second spring 7 and the third spring 8, and balance is achieved again. Finally, remove the depth adjustment component 6, press button 2 again to move it down to move it up, and rotate the rotation positioning key 3 by a certain angle. At this time, the pressure rod 111-2 is directly opposite the push plate 3-1. When the rotation positioning key 3 moves down, it will drive the needle withdrawal component 11 to move down, thereby moving the sleeve 112 down into the blood collection needle retainer 503 and pushing out the blood collection needle inside, thus achieving the purpose of needle withdrawal.

[0048] Then install the depth adjustment component 6. Repeat the above operation when using it again. The two presses form a needle extension and retraction cycle. When the button 2 is pressed for the first time, the pressure rod 111-2 directly enters the cavity 3-3, so it will not cause the needle retraction component 11 to be pressed and cause accidental operation. When the button 2 is pressed for the second time, the pressure rod 111-2 is aligned with the push plate 3-1 to retract the needle.

[0049] The specific operation and blood collection principle of this embodiment are the same as those of embodiment 3.

[0050] 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 convenient blood collection pen, characterized in that: It includes a fixed cylinder (1), a button (2), a rotary positioning key (3), an inner cylinder (4), a blood collection needle fixing assembly (5), and a depth adjustment assembly (6); The button (2), the rotary positioning button (3), the inner cylinder (4) and the blood collection needle fixing assembly (5) are all coaxially arranged inside the fixing cylinder (1). The inner cylinder (4) is fixedly clamped at the bottom of the fixing cylinder (1). The depth adjustment assembly (6) is installed at the bottom of the inner cylinder (4) and is clamped and fixed to the inner cylinder (4). The button (2) is located on the upper side of the rotary positioning key (3) to drive the rotary positioning key (3) to move down; when the bottom of the button (2) and the top of the rotary positioning key (3) are engaged and in contact, the rotary positioning key (3) can be rotated by a certain angle. The inner wall of the fixed cylinder (1) is provided with a convex ring (101), and the convex ring (101) is provided with a plurality of vertical grooves (101-1). The outer wall of the rotary positioning key (3) is provided with a plurality of second limiting protrusions (302), and the second limiting protrusions (302) can be matched and inserted into the vertical grooves (101-1). The bottom of the rotary positioning key (3) is hollow and a magnetic magnet (10) is fixedly embedded therein. The upper connecting end (502) of the blood collection needle fixing assembly (5) is made of iron. The upper connecting end (502) is magnetically attracted and fixed to the magnetic magnet (10). The blood collection needle fixing assembly (5) includes a guide shaft (501), an upper connecting end (502) disposed at the top of the guide shaft (501), and a blood collection needle clamping part (503) disposed at the bottom of the guide shaft (501). The guide shaft (501) is disposed through the top wall of the inner cylinder (4). A second spring (7) is fixedly disposed between the top wall of the inner cylinder (4) and the upper connecting end (502). A third spring (8) is disposed between the top wall of the inner cylinder (4) and the blood collection needle clamping part (503). A first spring (9) is fixedly disposed between the top wall of the inner cylinder (4) and the bottom end of the rotary positioning key (3).

2. The convenient blood collection pen according to claim 1, characterized in that: The bottom of the vertical groove (101-1) is open and the vertical groove (101-1) divides the bottom of the convex ring (101) into multiple parts, each of which is set as a serrated third engaging part (101-2). The bottom of the button (2) is provided with a serrated first engaging part (201), and the bottom circumference of the outer wall of the button (2) is uniformly provided with the same number of limiting protrusions (202) as the vertical grooves (101-1). The limiting protrusions (202) are engaged in the corresponding vertical grooves (101-1). The top of the rotary positioning key (3) is provided with a serrated second engaging part (301), and the outer wall of the rotary positioning key (3) is uniformly provided with the same number of second limiting protrusions (302) as the vertical grooves (101-1). The second limiting protrusions (302) are engaged in the corresponding vertical grooves (101-1). The bottom of the second limiting protrusions (302) is connected as a whole by a bottom sealing ring (303). The first engaging part (201) and the second engaging part (301) are shaped to fit each other. During assembly, they are misaligned. The serrated tip of the first engaging part (201) is set directly opposite the serrated slope of the second engaging part (301). The second engaging part (301) can engage and limit the third engaging part (101-2).

3. The convenient blood collection pen according to claim 1, characterized in that: It also includes a needle withdrawal assembly (11) for withdrawing the blood collection needle. The needle withdrawal assembly (11) includes a needle withdrawal pusher (111) and a sleeve (112). The needle withdrawal pusher (111) includes a movable horizontal plate (111-1), a pressure rod (111-2), and a guide post (111-3). The pressure rod (111-2) is fixedly installed at both ends of the top wall of the movable horizontal plate (111-1). The guide post (111-3) is fixedly installed at the center of the bottom wall of the movable horizontal plate (111-1). The sleeve (112) is fixedly sleeved on the guide post (111-3). A guide cylinder (404) is coaxially fixed on the top wall of the inner cylinder (4), and guide grooves (405) are symmetrically opened on the guide cylinder (404). The movable horizontal plate (111-1) is inserted into the guide groove (405). The guide shaft (501) is hollow inside, and the lower half of the guide shaft (501) has symmetrical movable guide grooves (501-1) on its side wall. The movable cross plate (111-1) is inserted into the movable guide groove (501-1) and moves up and down along the movable guide groove (501-1). The sleeve (112) is set in the internal cavity of the guide shaft (501). A protruding ring (101) is provided inwardly on the inner wall of the fixed cylinder (1). Multiple sets of vertical grooves (101-1) are evenly distributed around the circumference of the protruding ring (101). Each set of vertical grooves (101-1) includes two adjacent vertical grooves, namely a first vertical groove (101-1-1) and a second vertical groove (101-1-2). The multiple sets of vertical grooves (101-1) are evenly distributed around the circumference, and the first vertical groove (101-1-1) and the second vertical groove (101-1-2) are staggered. 01-1) The bottom of the convex ring (101) is divided into multiple parts. Among them, the bottom of the convex ring (101) between the first vertical groove (101-1-1) and the second vertical groove (101-1-2) in the same group of vertical grooves (101-1) is a running surface. The bottom of the convex ring (101) between the adjacent first vertical groove (101-1-1) and the second vertical groove (101-1-2) in different groups of vertical grooves (101-1) is a serrated third engaging part (101-2) or a running surface. The bottom of the button (2) is provided with a serrated first engaging part (201), and the bottom circumference of the outer wall of the button (2) is uniformly provided with limiting protrusions (202) of the same number as the vertical grooves (101-1). The limiting protrusions (202) are engaged in the first vertical groove (101-1-1) in the corresponding vertical groove (101-1); the top of the rotary positioning key (3) is provided with a serrated second engaging part (301), and the outer wall of the rotary positioning key (3) is symmetrically provided with second limiting protrusions (302) of the same number as the vertical grooves (101-1). The second limiting protrusions (302) are respectively engaged in the corresponding vertical grooves (101-1), and the bottom of the second limiting protrusions (302) is connected as a whole by a bottom sealing ring (303); The first engaging part (201) and the second engaging part (301) are shaped to fit each other. During assembly, they are misaligned. The serrated tip of the first engaging part (201) is set directly opposite the serrated inclined surface of the second engaging part (301). The second engaging part (301) can engage and limit the third engaging part (101-2). The rotary positioning key (3) is hollow inside and has multiple sets of push plates (3-1) fixedly arranged downwards. The multiple sets of push plates (3-1) are fixedly arranged along the inner circumference of the rotary positioning key (3). A fitting part (3-2) is formed between the multiple sets of push plates (3-1). An adsorption magnet (10) is fixedly embedded in the fitting part. The upper connecting end (502) of the blood collection needle fixing assembly (5) is an iron part that can be adsorbed and fixed with the adsorption magnet (10). Each set of push plates (3-1) includes two symmetrically arranged half-push plates, and a cavity (3-3) is formed between adjacent half-push plates. Two pressure rods (111-2) are arranged opposite a set of push plates (3-1) or opposite the cavity (3-3). The push plates (3-1) are arranged opposite a set of symmetrical first vertical grooves (101-1-1).

4. A convenient blood collection pen according to claim 2 or 3, characterized in that: The bottom inner wall of the fixed cylinder (1) is provided with a plurality of mounting grooves (102) evenly arranged around the circumference, so as to install and fix the inner cylinder (4); the mounting groove (102) is a first mounting groove (102-1) and a second locking groove (102-2) connected vertically, and the first mounting groove (102-1) forms an opening at the bottom of the fixed cylinder (1); The inner cylinder (4) is a cylindrical structure with a top wall. A through hole (401) is provided at the center of the top wall of the inner cylinder (4) to facilitate the movement of the guide shaft (501). The outer wall of the inner cylinder (4) is provided with mounting blocks (402) in the same number as the mounting groove (102). The width and length of the mounting blocks (402) are matched with the first mounting groove (102-1).

5. A convenient blood collection pen according to claim 4, characterized in that: The depth adjustment component (6) includes a fixed limiting component (61), a lifting component (62), and a rotating limiting head (63). The fixed limiting component (61) is composed of an integrally formed upper fixing ring (61-1), an intermediate gear adjusting ring (61-2), and a bottom locking ring (61-3) connected in a stepped manner to each other, and the ring diameters of the upper fixing ring (61-1), the intermediate gear adjusting ring (61-2), and the bottom locking ring (61-3) decrease sequentially. The lifting component (62) is sleeved on the bottom locking ring (61-3). The outer wall of the lifting component (62) is provided with an upwardly sloping groove (62-1). The outer wall of the bottom locking ring (61-3) is provided with a slider (61-31). The slider (61-31) is locked in the groove (62-1). The bottom wall of the lifting component (62) is provided with a through hole for the tip of the blood collection needle to pass through. The rotating limiting head (63) is sleeved on the intermediate gear adjustment ring (61-2). A locking block (61-21) is fixedly installed on the bottom side wall of the intermediate gear adjustment ring (61-2). An annular inner groove (63-1) is opened on the inner wall of the rotating limiting head (63). The locking block (61-21) is locked in the annular inner groove (63-1). A limiting guide block (63-2) is fixedly installed on the inner wall of the rotating limiting head (63). A vertical groove (62-2) is opened on the outer wall of the lifting component (62). The limiting guide block (63-2) is locked in the vertical groove (62-2). The limiting guide block (63-2) is located on the lower side of the annular inner groove (63-1). A through hole for the needle tip of the blood collection needle to pass through is also opened on the bottom wall of the rotating limiting head (63).

6. A convenient blood collection pen according to claim 5, characterized in that: A limiting groove (403) is provided on the bottom outer wall of the inner cylinder (4), and a locking protrusion (61-11) is provided on the inner wall of the upper fixing ring (61-1). The upper fixing ring (61-1) is sleeved on the bottom outer side of the inner cylinder (4) and the locking protrusion (61-11) is locked in the limiting groove (403) to lock and fix the fixing cylinder and the upper fixing limiting member (21). The outer wall of the intermediate gear adjustment ring (61-2) is grooved to form a gear adjustment component (61-22). The movable end of the gear adjustment component (61-22) is provided with a protrusion (61-23). ​​The inner wall of the rotating limiting head (63) that contacts the intermediate gear adjustment ring (61-2) is provided with multiple gear grooves (63-3). The protrusion (61-23) is engaged in one of the gear grooves (63-3). The outer wall of the rotating limiting head (63) is provided with a depth indicator bar (63-4) corresponding to the gear groove (63-3).

7. A convenient blood collection pen according to claim 6, characterized in that: The outer wall of the rotary positioning key (3) is provided with a first mounting ring groove (304). The first mounting ring groove (304) is located on the bottom side of the bottom sealing ring (303). A first sealing ring (12) is sleeved inside the first mounting ring groove (304) to seal the contact between the rotary positioning key (3) and the fixed cylinder (1).

8. A convenient blood collection pen according to claim 7, characterized in that: The outer wall of the inner cylinder (4) is provided with a second mounting ring groove (406) and a third mounting ring groove (407). The second mounting ring groove (406) and the third mounting ring groove (407) are respectively located on the upper side and the lower side of the mounting block (402). The second mounting ring groove (406) and the third mounting ring groove (407) are respectively provided with a second sealing ring (13) and a third sealing ring (14) to form a sealing structure between the contact part of the inner cylinder (4) and the fixed cylinder (1) and the contact part of the inner cylinder (4) and the depth adjustment component (6).

9. A convenient blood collection pen according to claim 8, characterized in that: The side wall of the intermediate gear adjustment ring (61-2) is provided with a fourth mounting ring groove (61-24). The fourth mounting ring groove (61-24) is located between the locking block (61-21) and the gear adjustment component (61-22). A fourth sealing ring (15) is provided in the fourth mounting ring groove (61-24) to seal the contact part between the fixed limiting component (61) and the rotating limiting head (63).

Images