Pediatric blood collection fixation device

Abstract

The present application belongs to the technical field of blood sampling auxiliary apparatus, and specifically discloses a pediatric blood sampling fixing device, which comprises a pressure-bearing base and a media player, the pressure-bearing base is fixedly connected with an arc-shaped blood sampling rack through a support column at the top, a flexible placement unit is arranged in the middle of the arc-shaped blood sampling rack, an arc-shaped mounting rack is fixedly installed on one side of the outer portion of the arc-shaped blood sampling rack, air pressure increasing units are arranged on both sides of the inner portion of the arc-shaped mounting rack, a vein imaging unit is arranged at the bottom of the inner side of the arc-shaped mounting rack, blood sampling fixing units are arranged at both ends of the inner portion of the arc-shaped blood sampling rack, a circular baffle is fixedly connected with the arc-shaped blood sampling rack through a fixing ring at the front end, a telescopic sleeve is fixedly installed in the middle of the inner portion of the circular baffle, and an arm passing channel is formed in the inner portion of the telescopic sleeve. The present application can dynamically maintain the optimal puncture posture of the arm, relieve the nervousness of the patient, reduce the feeling of forced restraint, and improve the blood sampling success rate and comfort.

Description

Technical Field

[0001] This invention belongs to the field of blood collection auxiliary device technology, and specifically discloses a pediatric blood collection fixation device. Background Technology

[0002] In pediatric clinical practice, venous blood collection from the arm is an extremely common procedure. Currently, most medical institutions still use open, standard treatment tables or ordinary chairs in their pediatric blood collection areas, lacking specialized restraint devices designed for the physiological and psychological characteristics of children. In practice, medical staff usually ask the child to place their arm directly on a plain towel or simple support, while a parent or caregiver assists by holding the child's forearm and hand to complete the puncture.

[0003] However, this exposed blood collection setting is clearly insufficient for children whose behavior is controllable but whose emotions are sensitive. Clinical observations have found that although children aged 3 to 8 can understand simple instructions and have a certain ability to cooperate, they generally exhibit emotional reactions such as tension, anxiety, and avoidance when faced with the pain of needle pricks and unfamiliar environments. At this time, if parents rely solely on verbal reassurance or increased physical restraint (such as forcibly holding down the arms or shoulders) to maintain the position, it is more likely to trigger the child's resistance and fear, manifesting as limb stiffness, muscle tension, involuntary withdrawal or twisting of the body, and even violent crying and struggling.

[0004] This forced, passive restraint not only increases the psychological stress on both doctors and patients but also significantly increases the risk of failed venipuncture, such as needle displacement, vein puncture, hematoma formation, or the need for a second puncture, thus exacerbating the child's painful experience. More importantly, current technology lacks a fixation scheme that can proactively adapt to the child's psychological needs during venipuncture while dynamically maintaining the optimal arm puncture posture. While some known venipuncture aids (such as arm fixation plates and wrist restraints) provide some degree of positional restriction, their design philosophy remains at the level of mechanical restraint to "prevent movement," lacking integration with psychological intervention mechanisms such as addressing the child's attention deficit, emotional soothing, and positive reinforcement. Furthermore, they fail to address the real-time adjustment issue caused by slight movements or changes in muscle tone in the child leading to puncture angle failure.

[0005] Furthermore, in cold environments or when peripheral circulation is poor, children's arm veins often constrict and become narrower, significantly increasing the difficulty of puncture. Existing blood collection fixation devices generally lack the function of local heating of the puncture area, making it impossible to promote vasodilation and improve venous filling through heat application. Medical staff can only rely on repeated patting or hot towels for temporary treatment, which is cumbersome and the effect is unstable, further aggravating the child's waiting anxiety and puncture pain.

[0006] Therefore, there is an urgent need to develop a blood collection fixation device that not only conforms to the concept of pediatric comfort medical care, but also effectively alleviates the anxiety of children, reduces the feeling of being forced and restrained, and can adaptively maintain the forearm and palm in the ideal puncture position throughout the entire process of venous blood collection, while also having a local heating function to optimize vascular conditions. Summary of the Invention

[0007] The purpose of this invention is to address the problems existing in the background art by proposing a pediatric blood collection fixation device, comprising a pressure-bearing base and a media player. The pressure-bearing base is fixedly connected to an arc-shaped blood collection frame via an upper support column. A flexible placement unit is provided in the middle of the arc-shaped blood collection frame. An arc-shaped mounting frame is fixedly installed on one side of the arc-shaped blood collection frame. Inflation and pressurization units are provided on both sides of the arc-shaped mounting frame. A vein imaging unit is provided at the bottom of the inner side of the arc-shaped mounting frame. Blood collection fixation units are provided at both ends of the arc-shaped blood collection frame. A circular baffle is fixedly connected to the arc-shaped blood collection frame via a fixing ring at the front end. A telescopic sleeve is fixedly installed in the middle of the circular baffle. An arm-penetrating channel is opened inside the telescopic sleeve. Three sets of light units are provided on the outer front end of the circular baffle. Adjustable playback units are provided on both outer rear ends of the circular baffle. A fixing column is fixedly installed on the outer front end of the pressure-bearing base, with one end of the fixing column embedded in the lower inner end of the circular baffle.

[0008] In summary, this device can dynamically maintain the optimal puncture posture for children's arms, while distracting them and relieving tension through light and media playback, effectively reducing the fear caused by forced restraint and improving the success rate and comfort of venous blood collection.

[0009] In the above scheme, the flexible placement unit further includes a flexible pad, which is integrally embedded in the middle of the arc-shaped blood collection frame, and the upper surface of the flexible pad is covered with a flexible anti-slip pad.

[0010] In the above solution, the inflation and pressurization unit further includes an inflation structure, which is fixedly installed inside one side of the arc-shaped mounting frame. The inflation structure is connected to an inflation pressure structure through an air inlet pipe at the top inside. The inflation pressure structure is connected to the blood collection fixation unit through nylon ropes fixedly connected to both sides of the outside. The inflation pressure structure is elliptical in shape. An electric air pressure sensing valve is installed on one side of the inflation structure. The inflation structure inflates into the inflation pressure structure through the air inlet pipe. After the inflation pressure structure expands, it pulls the blood collection fixation unit to move inward to the inside of the arc-shaped blood collection frame through the nylon ropes to adjust the tightness of the fixation on the child's arm.

[0011] In the above scheme, the vein imaging unit further includes a vein imaging instrument, which is rotatably connected to a slide rod via a damping shaft at one end, and a sliding element is provided at the lower end of the slide rod.

[0012] In the above solution, the sliding member further includes a track, which is fixedly installed on the bottom inner side of the arc-shaped mounting bracket and near the middle, and the sliding rod is slidably sleeved on the outside of the track.

[0013] In the above scheme, the blood collection fixing unit further includes an arm bracket, an arc-shaped opening on the upper part of the arm bracket, two nylon ropes are respectively fixedly installed on the upper ends of the arm bracket, and the arm bracket is fixedly installed inside one end of the arc-shaped blood collection frame.

[0014] In the above scheme, the three sets of lighting units further include three circular lamp housings, and touch-sensitive lamp modules are installed at equal intervals along the circumference inside the three circular lamp housings. The diameters of the three circular lamp housings decrease sequentially from the outside to the inside. A power controller is installed at the rear end of the circular baffle to control the touch-sensitive lamp modules.

[0015] In the above scheme, the retractable playback unit further includes a housing, which is fixedly installed on one side of the rear end of the circular baffle. An electric telescopic rod is embedded inside the housing. A damper is fixedly installed at the telescopic end of the electric telescopic rod. A connecting shaft is rotatably inserted in the middle of the damper. A mounting plate is fixedly sleeved on the outside of the connecting shaft. The media player is fixedly embedded on the front surface of the mounting plate.

[0016] In the above scheme, further, an L-shaped support arm is fixedly connected to one side of the rear end of the circular baffle. A track frame is fixedly installed above one end of the L-shaped support arm. A moving rod is provided inside the track frame. Silent wheels are installed at both ends of the moving rod and close to the inside of the track frame. The silent wheels roll and fit in the groove inside the track frame. A fixing plate is fixedly installed at the lower end of the moving rod. Electric push rods are fixedly installed at both ends of the fixing plate. A stop plate is fixedly installed at the telescopic end of the two electric push rods. A movable spring is fixedly installed at the lower end of the stop plate. A connecting column is connected to the lower end of the movable spring. A heating and application mechanism is provided at the lower ends of the two connecting columns.

[0017] In the above scheme, the heating and applying mechanism further includes a retaining ring, the lower ends of the two connecting columns are fixedly connected to the upper surface of the retaining ring, a heating ring seat is embedded inside the retaining ring, and a gravity heat transfer pad is installed at the bottom of the heating ring seat.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention provides a semi-enclosed space for children's arms by setting up an arc-shaped blood collection frame, a circular baffle, and an arm-penetrating channel. This avoids the direct exposure of children in traditional open environments, effectively reducing the visual impact and psychological defenses of the blood collection scene. Combined with the flexible support of the arm by the flexible pad, it establishes a basic sense of security and comfort before blood collection. In addition, during use, the arm is guided into the arc-shaped blood collection frame through the arm-penetrating channel in the telescopic sleeve. Combined with the natural shielding of the hand and face by the circular baffle, it not only limits the unexpected retraction of the arm but also avoids the resistance reaction caused by forcibly pressing the shoulder or torso. The overall structure is designed to conform to the natural posture of children's limbs, taking into account both necessary positional restrictions and the child's independent activity space, which is in line with the concept of pediatric comfort care.

[0019] 2. This invention features three sets of circular lamp housings with decreasing diameters and touch-sensitive lamp modules at the front end of a circular baffle. The interactive lighting, triggered layer by layer, attracts children's attention. Simultaneously, a media player is located at the rear end of the circular baffle, capable of playing animations or audio content. This dual distraction mechanism of light and media actively diverts the child's attention from the pain of the puncture and the unfamiliar environment, alleviating tension and anxiety, and significantly reducing physical resistance caused by fear.

[0020] 3. This invention utilizes an inflation structure, an air inlet pipe, and an inflation-pressure structure to form an inflation-boosting unit. An electric pressure-sensing valve controls the inflation volume, causing the inflation-pressure structure to expand and then smoothly pull the arm holder towards the inside of the arc-shaped blood collection frame via a nylon rope. This design dynamically adjusts the tightness of the fixation according to the child's arm thickness and real-time muscle tone changes, avoiding the pressure and discomfort caused by traditional rigid constraints. It also prevents puncture angle failure due to slight movements by the child, achieving adaptive posture maintenance.

[0021] 4. This invention features an L-shaped support arm, a track frame, and a heating application mechanism at the rear end of the circular baffle. A moving rod, an electric push rod, and a movable spring precisely attach the heating ring seat and gravity-based heat transfer pad within the retaining ring to the puncture area of ​​the child's arm, providing gentle heating to the local skin. This heating function promotes vasodilation and improves venous filling, making it particularly suitable for children in cold environments or with poor peripheral circulation. Furthermore, the integrated vein imaging unit (including a vein imaging device, a damping shaft, a slide bar, and a track) can be freely adjusted at multiple angles, projecting near-infrared light onto the heated skin surface of the arm. Because heating significantly enhances the temperature difference and optical contrast between the subcutaneous veins and surrounding tissues, the vascular images acquired by the vein imaging device are clearer and more continuous, allowing medical personnel to quickly and accurately select the optimal puncture point. The synergistic effect of the heating application and vein imaging solves the problem of unclear imaging in poor vascular conditions and avoids the inconvenience and inefficiency of relying solely on repeated patting or temporary treatment with hot towels, greatly improving the success rate of a single puncture and reducing the pain of repeated punctures for children. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention from another angle; Figure 3 This is a schematic diagram of the overall structure of the present invention from other angles; Figure 4 This is a schematic diagram of the connection structure between the circular baffle and the fixing ring of the present invention; Figure 5 This is a schematic diagram of the connection structure between the pressure-bearing base, the arc-shaped blood collection frame, and the blood collection fixing unit of the present invention; Figure 6 This is a schematic diagram of the connection structure between the vein imaging unit and the arc-shaped mounting frame of the present invention; Figure 7 This is a partial structural connection diagram of the retractable adjustable playback unit of the present invention; Figure 8 The present invention comprises an L-shaped support arm and track frame, as well as a heating and application mechanism; Figure 9 This is a schematic diagram of the connection structure between the retaining ring, gravity heat transfer pad, and heating ring seat of the present invention.

[0023] In the diagram: 1. Pressure-bearing base; 2. Circular baffle; 3. Circular lamp housing; 4. Electric telescopic rod; 5. Touch-sensitive lamp module; 6. Arc-shaped mounting bracket; 7. Mounting plate; 8. Media player; 9. Telescopic sleeve; 10. Arc-shaped blood collection frame; 11. Flexible pad; 12. Damper; 13. Fixing ring; 14. Housing; 15. Fixing column; 16. Support column; 17. Arm passage; 18. Power controller; 19. Arm holder; 20. Arc-shaped opening; 2 1. Nylon rope; 22. Inflatable pressure-resistant structure; 23. Air inlet pipe; 24. Electric air pressure sensing valve; 25. Inflatable structure; 26. Vein monitor; 27. Damping pivot; 28. Slide rod; 29. ​​Connecting shaft; 30. Track; 31. Track frame; 32. L-shaped support arm; 33. Silent wheel; 34. Moving rod; 35. Electric push rod; 36. Heating ring seat; 37. Gravity heat transfer pad; 38. Snap ring; 39. Connecting column; 40. Movable spring. Detailed Implementation

[0024] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0026] like Figures 1-9 The illustrated pediatric blood collection fixation device includes a pressure-bearing base 1 and a media player 8. The pressure-bearing base 1 is fixedly connected to an arc-shaped blood collection frame 10 via an upper support column 16. A flexible placement unit is provided in the middle of the arc-shaped blood collection frame 10. An arc-shaped mounting frame 6 is fixedly installed on one side of the arc-shaped blood collection frame 10. An inflation pressurization unit is provided on both sides of the arc-shaped mounting frame 6. A vein imaging unit is provided at the bottom of the inner side of the arc-shaped mounting frame 6. Blood collection fixation units are provided at both ends of the arc-shaped blood collection frame 10. A circular baffle 2 is fixedly connected to the arc-shaped blood collection frame 10 via a front-end fixing ring 13. A telescopic sleeve 9 is fixedly installed in the middle of the circular baffle 2. An arm-penetrating channel 17 is opened inside the telescopic sleeve 9. Three sets of light units are provided on the front exterior of the circular baffle 2. Retractable adjustable playback units are provided on both sides of the rear exterior of the circular baffle 2. A fixing column 15 is fixedly installed on the front exterior of the pressure-bearing base 1. One end of the fixing column 15 is embedded in the lower end of the circular baffle 2.

[0027] In this embodiment, during use, the pressure-bearing base 1 is stably placed on the blood collection table. The child's arm is inserted through the arm-penetrating channel 17 within the telescopic sleeve 9 behind the circular baffle 2 until the forearm is placed inside the arc-shaped blood collection frame 10. The circular baffle 2 is connected to the arc-shaped blood collection frame 10 via a fixing ring 13. The fixing post 15 at the front end of the pressure-bearing base 1 is embedded in the lower end of the circular baffle 2, ensuring that the entire circular baffle 2 can be rigidly supported at the front end. After the arm is placed, the flexible placement unit, the inflation and pressurization unit, and the blood collection fixing unit within the arc-shaped blood collection frame 10 work together to maintain the arm's posture; the lighting unit and the media player 8 distract the child's attention; and the vein imaging unit assists in puncture.

[0028] This method provides a semi-enclosed blood collection space, avoiding direct exposure of the arm and reducing children's fear; at the same time, it integrates multiple functions such as fixation, imaging, and distraction to improve the success rate of blood collection.

[0029] The machine is also equipped with an external controller for unified control of the lights, inflation, and audio-visual functions.

[0030] The flexible placement unit includes a flexible pad 11, which is embedded in the middle of the arc-shaped blood collection frame 10, and the upper surface of the flexible pad 11 is covered with a flexible anti-slip pad.

[0031] In this embodiment, the child's forearm is placed on the flexible pad 11. The flexible anti-slip pad adapts to the contour of the arm, providing uniform support and preventing the arm from sliding laterally during blood collection. The flexible material can buffer local pressure, avoiding compression of the ulnar or radial nerve by the rigid support, and improving arm comfort.

[0032] It should be noted that after each procedure, medical staff can disinfect the surface of the flexible pad 11, or, when dealing with children with sensitive skin, additionally lay down disposable sterile gauze.

[0033] The inflation booster unit includes an inflation structure 25, which is fixedly installed inside one side of the arc-shaped mounting frame 6. The inflation structure 25 is connected to an inflation pressure structure 22 through an air inlet pipe 23 at the top inside. The inflation pressure structure 22 is connected to the blood collection fixation unit through nylon ropes 21 fixedly connected to both sides outside. The inflation pressure structure 22 is elliptical in shape. An electric air pressure sensing valve 24 is installed on one side of the inflation structure 25. The inflation structure 25 inflates the inflation pressure structure 22 through the air inlet pipe 23. After the inflation pressure structure 22 expands, it pulls the blood collection fixation unit to move inside the arc-shaped blood collection frame 10 through the nylon ropes 21 to adjust the tightness of the fixation on the child's arm.

[0034] In this embodiment, after the inflation structure 25 is activated, air is inflated into the inflation pressure structure 22 through the air inlet pipe 23. The inflation pressure structure 22 expands, increasing its lateral dimension, thereby smoothly pulling the arm holder 19 towards the inside of the arc-shaped blood collection frame 10 via the nylon ropes 21 fixed on both sides, achieving gentle fixation of the child's arm. The electric air pressure sensing valve 24 monitors the air pressure in real time and can automatically adjust the inflation volume according to changes in arm thickness and muscle tone, dynamically adapting the tightness of the fixation. After blood collection, the air is released, causing the inflation pressure structure 22 to contract, and the arm holder 19 automatically retracts, releasing the fixation. This replaces the traditional rigid strap, achieving air pressure-driven adaptive fixation, avoiding excessive pressure that could cause limb numbness or blood circulation disorders, and preventing the puncture angle from failing due to slight movements of the child.

[0035] The vein imaging unit includes a vein imaging instrument 26. The vein imaging instrument 26 is rotatably connected to a slide rod 28 via a damping shaft 27 at one end. A sliding element is provided at the lower end of the slide rod 28. The sliding element includes a track 30. The track 30 is fixedly installed on the bottom inner side of the arc-shaped mounting bracket 6 and near the middle. The slide rod 28 is slidably sleeved on the outside of the track 30.

[0036] In this embodiment, the slide bar 28 can slide on the track 30, moving the vein imaging device 26 along the arm direction to the target area. This changes the position of the vein imaging device 26 along the long axis of the arm. The projection angle of the vein imaging device 26 can be adjusted by the damping pivot 27, allowing its near-infrared or visible light to be projected onto the skin surface of the arm, clearly displaying the course of subcutaneous veins. Medical personnel select the optimal puncture point based on the projected image.

[0037] The light source intensity of the vein imaging device 26 should meet medical safety standards to avoid thermal damage to the eyes or skin from prolonged exposure. The vein imaging device 26 integrates near-infrared light-emitting diodes, image sensors, projection modules, power and signal interfaces, etc., which are common knowledge and will not be described in detail.

[0038] The blood collection fixation unit includes an arm bracket 19, with an arc-shaped opening 20 on the top of the arm bracket 19. Two nylon ropes 21 are fixedly installed on the top of both ends of the arm bracket 19, and the arm bracket 19 is fixedly installed inside one end of the arc-shaped blood collection frame 10.

[0039] In this embodiment, the arm support 19 is located inside the arc-shaped blood collection frame 10 on the side near the circular baffle 2. When the inflation booster unit is working, the nylon rope 21 is pulled, restricting the inflation pressure structure 22 at both ends and guiding the inflation pressure structure 22 to be pulled inward toward the arm support 19, so that the arc-shaped opening 20 above it fits against the child's forearm or elbow area, forming a wrap-around fixation.

[0040] It should be noted that all areas of the curved opening 20 that come into contact with a child's skin should be covered with a medical silicone pad.

[0041] The three lighting units include three circular lamp housings 3. Touch-sensitive lamp modules 5 are installed at equal intervals along the circumference inside the three circular lamp housings 3. The diameter of the three circular lamp housings 3 decreases sequentially from the outside to the inside. A power controller 18 is installed at the rear end of the circular baffle 2 to control the touch-sensitive lamp modules 5.

[0042] In this embodiment, the power controller 18 supplies power to the touch-sensitive light module 5. While waiting or during blood collection, children can actively touch or follow the lights inside the circular light housings 3. The touch-sensitive module responds to touch or proximity signals, sequentially illuminating rings of different diameters, creating an interactive light game. The light colors can be set to soft colors such as red, yellow, and green to attract attention and distract children from the pain of puncture through visual interaction, reducing stiffness or struggle caused by tension. The lights illuminating provide a psychological cue of goal completion, enhancing their willingness to cooperate.

[0043] It should be noted that the three circular lamp housings 3 are all made of translucent plastic or acrylic, with diameters of large, medium, and small, decreasing from the outside in. Each touch-sensitive lamp module 5 consists of a capacitive or thin-film pressure touch sensor and an LED bead. The two can be integrated on a small PCB board and embedded in the rear end or inside of the circular baffle 2. The sensing surface of the touch sensor faces the outer surface of the circular lamp housing 3 (i.e., the side that children can touch), and the light-emitting surface of the LED bead also faces the same direction. Specifically, each touch-sensitive lamp module 5 is equipped with two control lines and two power lines. The wiring harnesses of the modules converge on the circular motherboard of the circular lamp housing 3 PCB and are then electrically connected to the power controller 18.

[0044] The power controller 18 contains a microcontroller, LED, constant current driver chip, and touch signal acquisition chip.

[0045] The working principle is as follows: when a child touches the touch-sensitive lamp module 5 on a certain circular lamp housing 3, the change in capacitance or pressure generates an electrical signal, which is transmitted to the power controller 18 via the signal line. After the microcontroller detects the signal, it controls the LED beads of the corresponding module to light up in a preset mode. The above components and connection methods are all common knowledge and will not be described in detail.

[0046] The retractable adjustable playback unit includes a housing 14, which is fixedly installed on one side of the rear end of the circular baffle 2. An electric telescopic rod 4 is embedded inside the housing 14. A damper 12 is fixedly installed at the telescopic end of the electric telescopic rod 4. A connecting shaft 29 is rotatably inserted in the middle of the damper 12. A mounting plate 7 is fixedly sleeved on the outside of the connecting shaft 29. The media player 8 is fixedly embedded on the front surface of the mounting plate 7. The damper 12 has both rotation buffer and angle limiting functions, which can prevent the media player 8 from shaking freely.

[0047] In this embodiment, the electric telescopic rod 4 is embedded in the housing 14. Its telescopic end drives the damper 12, connecting shaft 29, and mounting plate 7 to move back and forth as a whole, thereby adjusting the distance between the media player 8 and the child's eyes. The damper 12 and connecting shaft 29 form a rotation mechanism, which allows manual adjustment of the pitch angle of the mounting plate 7 so that the screen of the media player 8 is directly facing the child's line of sight. The media player 8 can play pre-stored animations, music, or soothing voice messages.

[0048] Adjust the playback position flexibly according to the child's height and sitting posture to ensure comfortable viewing; the audio and video content continuously distracts auditory and visual attention, reducing alertness to blood collection procedures and minimizing crying.

[0049] An L-shaped support arm 32 is fixedly connected to one side of the rear end of the circular baffle 2. A track frame 31 is fixedly installed above one end of the L-shaped support arm 32. A moving rod 34 is provided inside the track frame 31. Silent wheels 33 are installed at both ends of the moving rod 34 and close to the inside of the track frame 31. The silent wheels 33 roll and fit in the groove inside the track frame 31, and can move back and forth smoothly and quietly along the track frame 31, thereby moving the lower component to the appropriate position in the arm puncture area. A fixing plate is fixedly installed at the lower end of the moving rod 34. Electric push rods 35 are fixedly installed at both ends of the fixing plate. A stop plate is fixedly installed at the telescopic end of the two electric push rods 35. A movable spring 40 is fixedly installed at the lower end of the stop plate. The lower end of the spring 40 is connected to a connecting post 39. The movable spring 40 provides adaptive buffering pressure, allowing the heating application mechanism to conform to the contour curve of the child's arm, ensuring uniform fit and avoiding discomfort caused by rigid pressure. The lower ends of the two connecting posts 39 are jointly provided with the heating application mechanism, which includes a retaining ring 38. The lower ends of the two connecting posts 39 are fixedly connected to the upper surface of the retaining ring 38. A heating ring seat 36 is embedded inside the retaining ring 38, and a gravity heat transfer pad 37 is installed at the bottom of the heating ring seat 36. The heating ring seat 36 integrates a low-pressure constant temperature heating element (such as a PTC thermistor or a flexible heating film), which can generate gentle heat of 35℃~42℃ when powered by an external power source. The gravity heat transfer pad 37 is made of a highly thermally conductive flexible material (such as thermally conductive silicone or graphite pad), which naturally adheres to the surface of the child's arm skin under the action of gravity, and evenly and gently transfers heat to the puncture area, promoting local vasodilation and improving venous filling.

[0050] In this embodiment, after the child's arm is fixed by the blood collection fixation unit, medical staff manually or electrically push the moving rod 34 to make the silent wheel 33 roll along the track frame 31, moving the heating patch mechanism directly above the area to be punctured. Then, the two electric push rods 35 are activated, extending their telescopic ends downwards, pushing the movable spring 40, connecting column 39, and retaining ring 38 down as a whole. When the gravity heat transfer pad 37 contacts and presses against the arm skin, the movable spring 40 is further compressed, generating flexible buffer pressure to ensure that there are no gaps between the heat transfer pad and the skin and that the pressure is moderate. Then, the power supply to the heating ring seat 36 is turned on, and the local skin is gently heated for several tens of seconds to one minute. During this period, the vein imaging unit can be activated simultaneously or sequentially. Because heating causes the veins to dilate and the blood flow rate to increase, the temperature difference and near-infrared absorption and reflection differences between the veins under the skin and the surrounding tissues are significantly increased. The vascular images acquired by the vein imaging instrument 26 are clearer and the boundaries are sharper, which helps medical staff to quickly and accurately select the puncture point.

[0051] After the blood collection operation is completed, turn off the power to the heating ring seat 36. The electric push rod 35 retracts and resets, the movable spring 40 returns to its free length, and the entire heating patch mechanism moves upward, releasing the heat application from the arm. Subsequently, medical staff can push the moving rod 34 to one end of the track frame 31, so that the heating patch mechanism avoids the blood collection area, facilitating the removal of the arm and cleaning of the device.

[0052] It should be noted that the temperature of the heating ring seat 36 can be controlled by an independent temperature controller or a temperature control module integrated with the overall controller, and an overheat protection function is set to ensure safe use. The surface of the gravity heat transfer pad 37 can be wrapped with a disposable sterile isolation film to avoid cross-contamination.

[0053] Working principle: In use, first place the pressure base 1 on the blood collection table or a suitable location to ensure overall stability. Medical staff or parents guide the child to insert the arm requiring blood collection through the arm-penetrating channel 17 inside the telescopic sleeve 9 of the circular baffle 2. The child sits in front of the circular baffle 2, moving their arm along the arm-penetrating channel 17 until the forearm and palm area enter the arc-shaped blood collection frame 10, with the palm facing upwards, naturally resting on the flexible pad 11. The flexible anti-slip pad covering the upper surface of the flexible pad 11 provides flexible support for the arm, avoiding discomfort caused by hard contact.

[0054] Once the arm is in position, the inflation and pressurization unit is activated. The inflation structure 25 inflates the elliptical inflation-pressure structure 22 through the air inlet pipe 23, causing the structure to gradually expand. Its outer sides are fixedly connected to the upper ends of the arm support 19 via nylon ropes 21. As the inflation-pressure structure 22 expands, it smoothly pulls the arm support 19 towards the inside of the arc-shaped blood collection frame 10 via the nylon ropes 21. The arc-shaped opening 20 above the arm support 19 conforms to the contour of the child's arm, securing both ends of the forearm. The electric pneumatic pressure sensor valve 24 monitors and controls the inflation volume in real time, dynamically adjusting the tightness of the fixation according to changes in arm thickness and muscle tone to avoid excessive pressure or insufficient fixation. After fixation is completed and before blood collection, the collaborative workflow of the heating dressing mechanism and the vein imaging unit is activated. First, medical staff move the heating application mechanism to the area of ​​the child's arm to be punctured by sliding the silent wheel 33 along the groove of the track frame 31 above the L-shaped support arm 32 on the rear side of the sliding round baffle 2 using the sliding rod 34 inside the track frame 31. Then, two electric push rods 35 extend, pushing the abutment plate, movable spring 40 and connecting column 39 downward, so that the heating ring seat 36 inside the retaining ring 38 and the gravity heat transfer pad 37 at the bottom are tightly attached to the surface of the arm skin. After the heating ring seat 36 is powered on, it generates gentle heat, which is evenly transferred to the local tissue through the gravity heat transfer pad 37, promoting vasodilation and improving venous filling. After heating for several tens of seconds, the vein imaging unit is activated. The sliding rod 28 is moved along the track 30 by the sliding member, which drives the vein imager 26 to be adjusted to the appropriate position. Then, the vein imager 26 is rotated by the damping shaft 27, so that its near-infrared or visible light is projected onto the heated area of ​​the arm skin. Because heating significantly enhances the temperature difference and optical contrast between the subcutaneous vein and the surrounding tissue, the vascular image acquired by the vein imaging device 26 is clearer and more continuous. Medical staff can quickly and accurately select the best puncture point based on the projected image. It should be noted that the air-filled pressure structure 22 near the vein can be individually controlled according to the pressure during puncture, making the vein more prominent.

[0055] Before and during blood collection, distraction techniques are employed: First, the touch-sensitive light module 5 in the three light units is turned on, allowing children to interact with or observe the circular light housings 3 with decreasing diameters. Simultaneously, the retractable adjustable playback unit at the rear of the circular baffle 2 extends the mounting plate 7 to a suitable distance via the electric telescopic rod 4. The damper 12, in conjunction with the connecting shaft 29, adjusts the tilt angle of the media player 8, playing animations, music, and other media content to visually and aurally divert the child's fear and anxiety about puncture.

[0056] After blood collection is complete, the inflation structure 25 is closed, the electric air pressure sensing valve 24 releases air, the inflation pressure structure 22 retracts and resets, the nylon rope 21 loosens, and the arm holder 19 retracts outward, releasing the fixation on the arm. The child can then remove the arm from the arm-penetrating channel 17, completing the entire blood collection process.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A pediatric blood collection fixation device, comprising a pressure-bearing base (1) and a media player (8), characterized in that, The pressure-bearing base (1) is fixedly connected to an arc-shaped blood collection frame (10) via an upper support column (16). A flexible placement unit is provided in the middle of the arc-shaped blood collection frame (10). An arc-shaped mounting frame (6) is fixedly installed on one side of the outside of the arc-shaped blood collection frame (10). Inflation and pressurization units are provided on both sides of the arc-shaped mounting frame (6). A vein imaging unit is provided at the bottom of the inner side of the arc-shaped mounting frame (6). Blood collection fixing units are provided at both ends of the arc-shaped blood collection frame (10). 10) A circular baffle (2) is fixedly connected to the front end by a fixing ring (13). A telescopic sleeve (9) is fixedly installed in the middle of the inside of the circular baffle (2). A through-arm channel (17) is opened inside the telescopic sleeve (9). Three sets of light units are set on the front end of the circular baffle (2). A retractable playback unit is set on both sides of the rear end of the circular baffle (2). A fixing column (15) is fixedly installed on the front end of the pressure base (1). One end of the fixing column (15) is embedded in the lower end of the inside of the circular baffle (2).

2. The pediatric blood collection fixation device according to claim 1, characterized in that, The flexible placement unit includes a flexible pad (11), which is embedded in the middle of the arc-shaped blood collection frame (10), and the upper surface of the flexible pad (11) is covered with a flexible anti-slip pad.

3. The pediatric blood collection fixation device according to claim 1, characterized in that, The inflation and pressurization unit includes an inflation structure (25), which is fixedly installed inside one side of the arc-shaped mounting frame (6). The inflation structure (25) is connected to an inflation pressure structure (22) through an air inlet pipe (23) on the upper part of the interior. The inflation pressure structure (22) is connected to the blood collection fixation unit through nylon ropes (21) fixedly connected to both sides of the exterior. The inflation pressure structure (22) is elliptical in shape. An electric air pressure sensing valve (24) is installed on one side of the inflation structure (25). The inflation structure (25) inflates the inflation pressure structure (22) through the air inlet pipe (23). After the inflation pressure structure (22) expands, it pulls the blood collection fixation unit to move inside the arc-shaped blood collection frame (10) through the nylon rope (21) to adjust the tightness of the fixation on the child's arm.

4. The pediatric blood collection fixation device according to claim 1, characterized in that, The vein imaging unit includes a vein imaging instrument (26), which is rotatably connected to a slide rod (28) via a damping shaft (27) at one end. A sliding element is provided at the lower end of the slide rod (28).

5. A pediatric blood collection fixation device according to claim 4, characterized in that, The sliding element includes a track (30), which is fixedly installed on the bottom inner side of the arc-shaped mounting bracket (6) and near the middle. The sliding rod (28) is slidably sleeved on the outside of the track (30).

6. A pediatric blood collection fixation device according to claim 3, characterized in that, The blood collection fixing unit includes an arm bracket (19), an arc-shaped opening (20) is provided above the arm bracket (19), two nylon ropes (21) are respectively fixedly installed above the two ends of the arm bracket (19), and the arm bracket (19) is fixedly installed inside one end of the arc-shaped blood collection frame (10).

7. A pediatric blood collection fixation device according to claim 1, characterized in that, The three lighting units include three circular lamp housings (3), and touch-sensitive lamp modules (5) are installed at equal intervals along the circumference inside the three circular lamp housings (3). The diameters of the three circular lamp housings (3) decrease sequentially from the outside to the inside. A power controller (18) is installed at the rear end of the circular baffle (2) to control the touch-sensitive lamp modules (5).

8. A pediatric blood collection fixation device according to claim 1, characterized in that, The retractable playback unit includes a housing (14), which is fixedly installed on one side of the rear end of the circular baffle (2). An electric telescopic rod (4) is embedded inside the housing (14). A damper (12) is fixedly installed at the telescopic end of the electric telescopic rod (4). A connecting shaft (29) is rotatably inserted in the middle of the damper (12). An mounting plate (7) is fixedly sleeved on the outside of the connecting shaft (29). The media player (8) is fixedly embedded on the front surface of the mounting plate (7).

9. A pediatric blood collection fixation device according to claim 1, characterized in that, An L-shaped support arm (32) is fixedly connected to one side of the rear end of the circular baffle (2). A track frame (31) is fixedly installed above one end of the L-shaped support arm (32). A moving rod (34) is provided inside the track frame (31). Silent wheels (33) are installed at both ends of the moving rod (34) and close to the inside of the track frame (31). The silent wheels (33) roll and fit in the groove inside the track frame (31). A fixing plate is fixedly installed at the lower end of the moving rod (34). Electric push rods (35) are fixedly installed at both ends of the fixing plate. A stop plate is fixedly installed at the telescopic end of the two electric push rods (35). A movable spring (40) is fixedly installed at the lower end of the stop plate. A connecting column (39) is connected to the lower end of the movable spring (40). A heating and application mechanism is provided at the lower ends of the two connecting columns (39).

10. A pediatric blood collection fixation device according to claim 9, characterized in that, The heating and applying mechanism includes a retaining ring (38), and the lower ends of the two connecting columns (39) are fixedly connected to the upper surface of the retaining ring (38). A heating ring seat (36) is embedded inside the retaining ring (38), and a gravity heat transfer pad (37) is installed at the bottom of the heating ring seat (36).

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