Wearable leg circumference measuring device capable of preventing lower limb deep venous thrombosis for bedridden child patient

Abstract

The invention discloses a wearable leg circumference measuring device capable of preventing lower limb deep venous thrombosis for a bedridden child patient. The leg circumference measuring device comprises a control box; the leg circumference measuring mechanism comprises a first wearing part and a second wearing part, one end of the first wearing part is connected with the second wearing part through an elastic band, and a thigh positioning pad, a shank positioning pad and an ankle positioning pad are sequentially arranged in the second wearing part; flexible capacitive pressure sensors are arranged on the surfaces of one sides of the thigh positioning pad, the shank positioning pad and the ankle positioning pad in an annular array mode, and the flexible capacitive pressure sensors are connected with the main controller; according to the device, the thigh girth, the shank girth and the ankle girth are monitored according to changes of electric signals, formation of lower limb thrombus can be early warned according to changes of the girths, corresponding positions where blood flow is not smooth can be continuously pressurized and relieved, and the patient can be prevented from suffering from thrombus. And the thrombus formation probability is greatly reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and particularly relates to a leg circumference measuring device for preventing deep vein thrombosis in bedridden children, which is wearable. Background Technique

[0002] Deep venous thrombosis (DVT) refers to a pathological thrombus formed by abnormal coagulation of blood in the deep venous system of the lower extremities, resulting in partial or complete obstruction of the venous lumen, and then causing the pathophysiological process of venous return disorder. Compared with adults, pediatric DVT has unique epidemiological characteristics and a spectrum of risk factors, and its clinical symptoms are atypical and the onset is latent. Bedridden children are prone to form DVT due to reduced muscle activity and slow blood flow in the lower extremity veins. In severe cases, pulmonary embolism may occur and even endanger life. Due to factors such as impaired consciousness and sedation in critically ill bedridden children, they usually cannot complain of symptoms such as leg swelling, pain, redness, and fever, often accompanied by a high missed diagnosis rate, increasing the difficulty of screening.

[0003] A neuromuscular stimulator for intelligent wearable digital deep vein thrombosis prevention disclosed in the invention with the publication number of CN119345599A includes an electrical stimulator, a charging bin, and electrode patches; the charging bin can charge the electrical stimulator and record the working data of the electrical stimulator, and upload the data to the cloud platform; the electrode patches have a flexible B-ultrasound electrode module; it can record the blood flow velocity and flow peak value, and then detect whether a thrombus is formed. The present invention can achieve real-time intelligent monitoring and prevention, timely detect whether a thrombus is formed, and the stimulation data and detection data can be uploaded to the cloud platform to remind patients to seek medical treatment in time. The neuromuscular stimulator provided by this solution is small in size, suitable for various populations, and improves the user experience.

[0004] However, the above solution can only record the blood flow velocity to judge the formation of thrombus, and it cannot dynamically and real-time measure the circumference of the lower extremities, which is not convenient for accurately predicting thrombus. At the same time, it cannot relieve the blood vessels in the corresponding area according to the prediction structure, and cannot effectively and quickly achieve the effect of thrombus prevention. Therefore, we propose a leg circumference measuring device for preventing deep vein thrombosis in bedridden children, which is wearable. Summary of the Invention

[0005] The purpose of the present invention is to provide a leg circumference measuring device for preventing deep vein thrombosis in bedridden children, which is wearable, so as to solve the problems in the above background technique that the existing technical solutions cannot dynamically and real-time measure the circumference of the lower extremities, are not convenient for accurately predicting thrombus, and at the same time cannot relieve the blood vessels in the corresponding area according to the prediction structure, and cannot effectively and quickly achieve the effect of thrombus prevention.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: a wearable leg circumference measurement device for bedridden children to prevent deep vein thrombosis in the lower limbs, comprising a control box, an air pump disposed within the control box, one end of the air pump connected to a main air supply pipe, and the main air supply pipe connected to a leg circumference measurement mechanism via an air supply structure;

[0007] The leg circumference measurement mechanism includes a first wearing part and a second wearing part, one end of the first wearing part is connected to the second wearing part by an elastic band, and a thigh positioning pad, a calf positioning pad and an ankle positioning pad are sequentially arranged in the second wearing part and the second wearing part, and a flexible capacitive pressure sensor is arranged in a circular array on one side of the thigh positioning pad, the calf positioning pad and the ankle positioning pad. The flexible capacitive pressure sensor is connected to a main controller, and the main controller is arranged on a side surface of a control box;

[0008] Wherein, one side of the thigh positioning pad and the calf positioning pad are both provided with independently controllable airbag mechanisms, the airbag mechanisms are connected to the air delivery structure, and the main controller is connected to the air pump.

[0009] Preferably, a snap-fit groove is provided on one side of the first wearing portion, the snap-fit groove corresponds to the buckle portion, and the buckle portion is provided on one side surface of the second wearing portion, and can snap-fit and fix the first wearing portion and the second wearing portion.

[0010] Preferably, a metal block is embedded on one side surface of the buckle portion, and the metal block corresponds to the magnet block. The magnet block is embedded on one side surface of the buckle slot, and can adsorb and fix the buckle portion in the buckle slot.

[0011] Preferably, a fixing strap is further provided on the outer surface of the first wearing part on one side of the snap-fitting slot, and the fixing strap is bonded and fixed to the second wearing part via Velcro, which can fix the buckle part and simultaneously connect and fix the first wearing part and the second wearing part.

[0012] Preferably, the flexible capacitive pressure sensors are arranged in an array to collect in real time the changes in electrical signals when pressure is applied to the tested thigh, calf and ankle, and to capture tiny pressure gradient differences to form a spatial pressure distribution heat map. The main controller is used to extract key parameters such as the peak position, pressure gradient change rate, and contact area in the pressure distribution map, generate a two-dimensional feature matrix based on the physical coordinate information of the sensor array, expand the discrete pressure values into a continuous distribution surface through an interpolation algorithm, and construct a preliminary three-dimensional contour model based on geometric constraints such as the symmetry of the contact area and the edge attenuation characteristics. The circumference of the thigh, calf and ankle is then output, and the operation of the airbag mechanism is controlled according to the change in circumference.

[0013] Preferably, the gas transmission structure includes a three-way valve disposed at one end of the main gas pipeline. A first gas pipeline and a second gas pipeline are arranged on the three-way valve. The first gas pipeline and the second gas pipeline are respectively connected to the airbag mechanisms in the first wearing part and the second wearing part, and can simultaneously transport air flow into the airbag mechanisms.

[0014] Preferably, the airbag mechanism includes an upper airbag group and a lower airbag group. The upper airbag group is arranged in the first wearing part and the second wearing part on one side of the thigh positioning pad. The lower airbag group is arranged in the first wearing part and the second wearing part on one side of the lower leg positioning pad. The upper airbag group is connected to the upper arc-shaped gas pipeline through an upper diversion pipe. The upper arc-shaped gas pipeline is arranged in the first wearing part and the second wearing part. The lower airbag group is arranged in the first wearing part and the second wearing part on one side of the calf positioning pad. The lower airbag group is connected to the lower arc-shaped gas pipeline through a lower diversion pipe. The lower arc-shaped gas pipeline is arranged in the first wearing part and the second wearing part. A transfer pipe is arranged in the middle of the lower arc-shaped gas pipeline. The transfer pipe is connected to the first gas pipeline and the second gas pipeline. The upper arc-shaped gas pipeline is connected to the transfer pipe through a shunt pipe, and can control the pressure in the upper airbag group and the lower airbag group.

[0015] Preferably, a first electromagnetic switch valve is further arranged on one side of the transfer pipe, and a second electromagnetic switch valve is arranged on one side of the shunt pipe. The first electromagnetic switch valve and the second electromagnetic switch valve are connected to the main controller, and can independently control the pressure in the upper airbag group and the lower airbag group.

[0016] Preferably, a support frame is movably arranged in the upper airbag group and the lower airbag group. The radian of the support frame is the same as that of the upper airbag group and the lower airbag group. Installation ports are arranged in an array on one surface of the support frame, and rollers are arranged in the installation ports, which can perform soothing massage on the child's legs from bottom to top, improve blood circulation, and prevent the formation of blood clots.

[0017] Preferably, a guide rod is further arranged on one side of the support frame. The guide rod is movably arranged on one side of the upper airbag group and the lower airbag group. A return spring is sleeved on the guide rod, which can guide the movement of the support frame and facilitate the return movement of the support frame at the same time.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] (1) In this application, the pressure at the positions of the thigh, calf, and ankle can be monitored in real time through the flexural capacitive pressure sensors arranged in a circular array, and the thigh circumference, calf circumference, and ankle circumference can be monitored according to the change of the electric signal. The formation of lower limb thrombosis can be warned according to the change of the circumference.

[0020] (2) This application can independently control the operation of the airbag mechanism according to changes in thigh circumference, calf circumference, and ankle circumference, and can continuously apply pressure and relieve the corresponding positions with poor blood flow, greatly reducing the probability of thrombus formation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 is a schematic diagram of the structures of the first wearing part and the second wearing part of the present invention;

[0023] Figure 3 is a schematic diagram of the half-sectional structures of the first wearing part and the second wearing part of the present invention;

[0024] Figure 4 is Figure 3 an enlarged schematic diagram of part A in

[0025] Figure 5 is a schematic diagram of the structure of the first wearing part of the present invention;

[0026] Figure 6 is a schematic diagram of the structure of the airbag mechanism of the present invention;

[0027] Figure 7 is a schematic diagram of the structure of an embodiment of the present invention;

[0028] Figure 8 is Figure 7 an enlarged schematic diagram of part B in

[0029] In the figure: 1, the first wearing part; 2, the second wearing part; 3, the first air delivery pipe; 4, the second air delivery pipe; 5, the three-way valve; 6, the main air delivery pipe; 7, the main controller; 8, the control box; 11, the fixing strap; 12, the magic tape; 13, the elastic band; 14, the buckle part; 15, the clamping groove; 16, the magnet block; 17, the metal block; 101, the thigh positioning pad; 102, the flexible capacitive pressure sensor; 103, the calf positioning pad; 104, the ankle positioning pad; 105, the upper airbag group; 106, the lower airbag group; 107, the upper diversion pipe; 108, the upper arc-shaped air delivery pipe; 109, the shunt pipe; 110, the lower diversion pipe; 111, the lower arc-shaped air delivery pipe; 112, the second electromagnetic switch valve; 113, the transfer pipe; 114, the first electromagnetic switch valve; 115, the support frame; 116, the roller; 117, the installation port; 118, the guide rod; 119, the return spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Please refer to Figures 1 - 5 , the present invention provides a technical solution: a leg circumference measuring device for preventing lower limb deep vein thrombosis of bedridden children. An air pump is further provided in the control box 8. One end of the air pump is connected to the main air pipe 6, and the main air pipe 6 is connected to the leg circumference measuring mechanism through an air delivery structure.

[0032] The leg circumference measuring mechanism includes a first wearing part 1 and a second wearing part 2. Specifically, both the first wearing part 1 and the second wearing part 2 are arc-shaped structures, which improves their fitting degree with the legs of the child. One end of the first wearing part 1 is connected to the second wearing part 2 through an elastic band 13. Through the arrangement of the elastic band 13, the distance between the first wearing part 1 and the second wearing part 2 can be adjusted, improving their adaptability during wearing. A thigh positioning pad 101, a calf positioning pad 103, and an ankle positioning pad 104 are sequentially arranged in the second wearing part 2. Flexible capacitive pressure sensors 102 are arranged in a circular array on one side surface of the thigh positioning pad 101, the calf positioning pad 103, and the ankle positioning pad 104. The flexible capacitive pressure sensors 102 are connected to the main controller 7. The main controller 7 is arranged on one side surface of the control box 8, and the model of the main controller 7 is STM32F4.

[0033] A fixing strap 11 is further arranged on the outer surface of the first wearing part 1 on one side of the clamping groove 15. The fixing strap 11 is adhesively fixed to the second wearing part 2 through a magic tape 12, which can fix the buckle part 14 and connect and fix the first wearing part 1 and the second wearing part 2 at the same time.

[0034] A clamping groove 15 is arranged on one side of the first wearing part 1, corresponding to the buckle part 14. The buckle part 14 is arranged on one side surface of the second wearing part 2, which can clamp and fix the first wearing part 1 and the second wearing part 2.

[0035] First, adjust the distance between the first wearing part 1 and the second wearing part 2 through the elastic band, and make the first wearing part 1 and the second wearing part 2 be located on both sides of the child's legs, then snap the buckle part 14 into the snap groove 15, then fit the fixing strap 11 to the outer surface of the buckle part 14, and make it adhere to the second wearing part 2 and fix it, and then fix the first wearing part 1 and the second wearing part 2 to the child's legs, the thigh positioning pad 101 fits the position of the child's thigh, the calf positioning pad 103 fits the middle of the child's calf, and the ankle positioning pad 104 fits the upper side of the child's ankle, and the annular array on the thigh positioning pad 101, the calf positioning pad 103 and the ankle positioning pad 104 is arranged with flexible capacitive pressure The force sensor 102 monitors the pressure information of the thigh circumference, calf circumference and ankle circumference, and extracts key parameters such as the peak position, pressure gradient change rate, contact area, etc. in the pressure distribution diagram. It generates a two-dimensional feature matrix based on the physical coordinate information of the sensor array, and expands the discrete pressure values into a continuous distribution surface through the interpolation algorithm. It constructs a preliminary three-dimensional contour model based on the geometric constraints such as the symmetry of the contact area and the edge attenuation characteristics. It then outputs the circumference size of the thigh, calf and ankle, which is the initial circumference. When the circumference of the child's thigh, calf or ankle changes, it can automatically control the airbag mechanism to operate and relieve the blood vessels in the corresponding area.

[0036] Furthermore, a metal block 17 is embedded in one side surface of the snap-on portion 14 , and the metal block 17 corresponds to the magnet block 16 , and the magnet block 16 is embedded in one side surface of the snap-on groove 15 . When the snap-on portion 14 is inserted into the snap-on groove 15 , the metal block 17 and the magnet block 16 are adsorbed and fixed, thereby being able to adsorb and fix the snap-on portion 14 in the snap-on groove 15 .

[0037] See also Figure 5 The array of flexible capacitive pressure sensors 102 is used to collect the changes in electrical signals when pressure is applied to the thigh, calf and ankle of the test subject in real time, and capture the tiny pressure gradient differences to form a spatial pressure distribution heat map. The main controller 7 is used to extract key parameters such as the peak position, pressure gradient change rate, and contact area in the pressure distribution map, generate a two-dimensional feature matrix based on the physical coordinate information of the sensor array, expand the discrete pressure values into a continuous distribution surface through the interpolation algorithm, and construct a preliminary three-dimensional contour model based on the geometric constraints such as the symmetry of the contact area and the edge attenuation characteristics. Then, the circumference of the thigh, calf and ankle is output, and the operation of the airbag mechanism is controlled according to the change in the circumference.

[0038] The details are as follows:

[0039] Heatmap generation:

[0040] The spatial pressure distribution matrix M is constructed using discrete pressure data detected by flexible capacitive pressure sensors arranged in a ring array.n×m , smooth the noise through Gaussian filtering:

[0041] M smooth = M * G σ ;

[0042] where: G σ is the Gaussian kernel function; σ is the smoothing coefficient.

[0043] Construction of the feature parameter matrix:

[0044] Extraction of key features:

[0045] 1. Peak detection: Determine the pressure center point (x c , y c ) through local maximum search:

[0046] (x c , y c ) = argmax i,j (M i,j ).

[0047] 2. Pressure gradient calculation: Calculate the two-dimensional gradient field using the Sobel operator

[0048]

[0049] 3. Contact area: After threshold segmentation, count the number of effective contact points N, and the area A = N · s 2 ;

[0050] where s is the spacing of the flexible capacitive pressure sensor.

[0051] Construction of the feature matrix:

[0052] Integrate the above parameters into the feature vector F = [x c , y c / / ▽M / / , A], and expand it into the feature matrix F n×m×4 .

[0053] Three-dimensional interpolation mapping:

[0054] 1. Bilinear interpolation algorithm:

[0055] Interpolate the discrete pressure value P i,j to generate a continuous surface S(x, y):

[0056] S(x,y)=\frac{(x_2 - x)(y_2 - y)P_{i,j}+(x - x_1)(y_2 - y)P_{i + 1,j}+(x_2 - x)(y - y_1)P_{i,j + 1}+(x - x_1)(y - y_1)P_{i + 1,j + 1}}{(x_2 - x_1)(y_2 - y_1)};

[0057] Where (x1, y1) and (x2, y2) are the coordinates of adjacent flexible capacitive pressure sensors.

[0058] 2. Initial contour reconstruction

[0059] Based on the pressure-deformation relationship assumption (such as Hooke's law), map the pressure value to the height field H(x, y):

[0060]

[0061] Where α is the elastic coefficient and β is the curvature correction term.

[0062] Output the thigh circumference, calf circumference, and ankle circumference.

[0063] The circumference calculation equation is:

[0064]

[0065] In the formula: C is the circumference, r is the radius, is a constant, is the reciprocal of the variable diameter relative to the angle θ.

[0066] Please refer to Figure 1 and Figure 6 , the gas delivery structure includes a three-way valve 5. The three-way valve 5 is arranged at one end of the main gas pipeline 6. A first gas pipeline 3 and a second gas pipeline 4 are arranged on the three-way valve 5. The first gas pipeline 3 and the second gas pipeline 4 are respectively connected to the airbag mechanisms in the first wearing part 1 and the second wearing part 2, and can simultaneously deliver air flow into the airbag mechanisms.

[0067] An airbag mechanism that can be independently controlled is provided on one side of the thigh positioning pad 101 and the calf positioning pad 103. The airbag mechanism is connected to an air delivery structure. The main controller 7 is connected to an air pump. The airbag mechanism includes an upper airbag group 105 and a lower airbag group 106. The upper airbag group 105 is arranged in the first wearing part 1 and the second wearing part 2 on one side of the thigh positioning pad 101. The lower airbag group 106 is arranged in the first wearing part 1 and the second wearing part 2 on one side of the lower leg positioning pad. The upper airbag group 105 is connected to the upper arc-shaped air pipe 108 through the upper diversion pipe 107. The upper arc-shaped air pipe 108 is arranged in the first wearing part 1 and the second wearing part 2. The lower airbag group 106 is arranged in the first wearing part 1 and the second wearing part 2 on one side of the calf positioning pad 103. The lower airbag group 106 is connected to the lower arc-shaped air pipe 111 through the lower diversion pipe 110. The lower arc-shaped air pipe 111 is arranged in the first wearing part 1 and the second wearing part 2. A transfer pipe 113 is arranged in the middle of the lower arc-shaped air pipe 111. The transfer pipe 113 is connected to the first air pipe 3 and the second air pipe 4. The upper arc-shaped air pipe 108 is connected to the transfer pipe 113 through the shunt pipe 109, and the pressure in the upper airbag group 105 and the lower airbag group 106 can be controlled.

[0068] A first electromagnetic switching valve 114 is also arranged on one side of the transfer pipe 113, and a second electromagnetic switching valve 112 is arranged on one side of the shunt pipe 109. The first electromagnetic switching valve 114 and the second electromagnetic switching valve 112 are connected to the main controller 7, and the pressure in the upper airbag group 105 and the lower airbag group 106 can be independently controlled.

[0069] When the thigh circumference, calf circumference, and ankle circumference are greater than the initial circumference, such as when the thigh circumference increases, the main controller 7 closes the first electromagnetic switching valve 114, opens the second electromagnetic switching valve 112, closes the lower diversion pipe 110, and the main controller 7 controls the air pump to operate. The air pump delivers air flow through the main air pipe 6 to the first air pipe 3 and the second air pipe 4. The first air pipe 3 and the second air pipe 4 deliver the air flow to the shunt pipe 109. The shunt pipe 109 delivers the air flow into the upper airbag group 105 in the first wearing part 1 and the second wearing part 2. The upper airbag group 105 expands reciprocally and guides the thigh blood vessels. If the calf circumference and ankle circumference are greater than the initial circumference, the main controller 7 opens the first electromagnetic switching valve 114, closes the second electromagnetic switching valve 112, closes the shunt pipe 109, and the main controller 7 controls the air pump to operate. The air pump delivers air flow through the main air pipe 6 to the first air pipe 3 and the second air pipe 4. The first air pipe 3 and the second air pipe 4 deliver the air flow to the transfer pipe 113. The transfer pipe 113 delivers the air flow into the lower arc-shaped air pipe 111 in the first wearing part 1 and the second wearing part 2. The lower arc-shaped air pipe 111 delivers the air flow into the lower airbag group 106. The lower airbag group 106 expands reciprocally and guides the calf blood vessels.

[0070] Please refer toFigure 7 and Figure 8 , a support frame 115 is also movably arranged in the upper airbag group 105 and the lower airbag group 106. The radian of the support frame 115 is the same as that of the upper airbag group 105 and the lower airbag group 106. Mounting ports 117 are arranged in an array on one surface of the support frame 115, and rollers 116 are arranged in the mounting ports 117, which can perform a soothing massage on the child's legs from bottom to top, improve blood circulation, and prevent the formation of blood clots; a guide rod 118 is also arranged on one side of the support frame 115. The guide rod 118 is movably arranged on one side of the upper airbag group 105 and the lower airbag group 106. A return spring 119 is sleeved on the guide rod 118, which can guide the movement of the support frame 115 and facilitate the return movement of the support frame 115.

[0071] After the air flow is transported into the upper airbag group 105 or the lower airbag group 106, under the action of air pressure, the support frame 115 is pushed to move. The support frame 115 drives the roller 116 to move and rotate. The roller 116 soothes the blood vessels from bottom to top. The movement of the support frame 115 drives the guide rod 118 to move. The movement of the guide rod 118 compresses the return spring 119. Under the action of the return spring 119, the support frame 115 can be driven to return and move, and can continuously guide the blood vessels, further improving blood circulation and preventing the formation of blood clots.

[0072] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A leg circumference measuring device for preventing lower limb deep vein thrombosis, wearable by bedridden children, comprising a control box (8), characterized in that: An air pump is also provided in the control box (8), one end of the air pump is connected to the main air pipe (6), and the main air pipe (6) is connected to the leg circumference measuring mechanism through an air transmission structure; The leg circumference measuring mechanism comprises a first wearing part (1) and a second wearing part (2), one end of the first wearing part (1) is connected to the second wearing part (2) through an elastic band (13), a thigh positioning pad (101), a calf positioning pad (103) and an ankle positioning pad (104) are sequentially arranged in the second wearing part (2), and flexible capacitive pressure sensors (102) are arranged in a circular array on one side surface of the thigh positioning pad (101), the calf positioning pad (103) and the ankle positioning pad (104), and the flexible capacitive pressure sensors (102) are connected to a main controller (7), and the main controller (7) is arranged on a side surface of a control box (8); Wherein, one side of the thigh positioning pad (101) and the calf positioning pad (103) is provided with an independently controllable airbag mechanism, the airbag mechanism is connected to the air delivery structure, and the main controller (7) is connected to the air pump.

2. The leg circumference measuring device for preventing lower limb deep vein thrombosis of bedridden children according to claim 1, characterized in that: A snap-fitting groove (15) is provided on one side of the first wearing portion (1), and the snap-fitting groove (15) corresponds to a buckle portion (14), and the buckle portion (14) is provided on a surface on one side of the second wearing portion (2).

3. The leg circumference measuring device for preventing deep vein thrombosis of lower limbs of bedridden children according to claim 2, wherein: A metal block (17) is embedded on one side surface of the buckle portion (14), and the metal block (17) corresponds to the magnet block (16). The magnet block (16) is embedded on one side surface of the inner side of the clamping groove (15).

4. A leg circumference measuring device for preventing lower limb deep vein thrombosis in bedridden children according to claim 2 or 3, characterized in that: A fixing strap (11) is also provided on the outer surface of the first wearing portion (1) on one side of the clamping slot (15), and the fixing strap (11) is bonded and fixed to the second wearing portion (2) via a Velcro (12).

5. The leg circumference measuring device for preventing deep vein thrombosis of lower limbs of bedridden children according to claim 1, wherein: The flexible capacitive pressure sensors (102) arranged in an array are used to collect in real time the changes in electrical signals when pressure is applied to the thigh, calf and ankle of the subject, and to capture small pressure gradient differences to form a spatial pressure distribution heat map. The main controller (7) is used to extract key parameters such as the peak position, pressure gradient change rate, and contact area in the pressure distribution map, generate a two-dimensional feature matrix based on the physical coordinate information of the sensor array, expand the discrete pressure values into a continuous distribution surface through an interpolation algorithm, and construct a preliminary three-dimensional contour model based on geometric constraints such as the symmetry of the contact area and the edge attenuation characteristics. The circumference dimensions of the thigh, calf and ankle are then output, and the operation of the airbag mechanism is controlled according to the changes in the circumference dimensions.

6. The leg circumference measurement device for preventing lower limb deep vein thrombosis wearable by bedridden children according to claim 1, wherein: The gas delivery structure comprises a three-way valve (5), the three-way valve (5) being arranged at one end of a main gas delivery pipe (6), a first gas delivery pipe (3) and a second gas delivery pipe (4) being arranged on the three-way valve (5), the first gas delivery pipe (3) and the second gas delivery pipe (4) being connected to the airbag mechanisms in the first wearing part (1) and the second wearing part (2), respectively.

7. The leg circumference measurement device for preventing lower limb deep vein thrombosis of bedridden children according to claim 1, wherein: The airbag mechanism includes an upper airbag group (105) and a lower airbag group (106). The upper airbag group (105) is arranged in the first wearing part (1) and the second wearing part (2) on one side of the thigh positioning pad (101). The lower airbag group (106) is arranged in the first wearing part (1) and the second wearing part (2) on one side of the lower leg positioning pad. The upper airbag group (105) is connected to the upper arc-shaped air pipe (108) through the upper diversion pipe (107). The upper arc-shaped air pipe (108) is arranged in the first wearing part (1) and the second wearing part (2). The lower airbag group (106) is arranged in the first wearing part (1) and the second wearing part (2) on one side of the lower leg positioning pad (103). The lower airbag group (106) is connected to the lower arc-shaped air pipe (111) through the lower diversion pipe (110). The lower arc-shaped air pipe (111) is arranged in the first wearing part (1) and the second wearing part (2). A transfer pipe (113) is arranged in the middle of the lower arc-shaped air pipe (111). The transfer pipe (113) is connected to the first air pipe (3) and the second air pipe (4). The upper arc-shaped air pipe (108) is connected to the transfer pipe (113) through the shunt pipe (109).

8. The leg circumference measuring device for preventing lower limb deep vein thrombosis of bedridden children according to claim 7, wherein: A first electromagnetic switch valve (114) is also arranged on one side of the transfer pipe (113). A second electromagnetic switch valve (112) is arranged on one side of the shunt pipe (109). The first electromagnetic switch valve (114) and the second electromagnetic switch valve (112) are connected to the main controller (7).

9. A leg circumference measuring device for bedridden children to prevent deep vein thrombosis of the lower extremities according to claim 7, characterized in that: A support frame (115) is also movably arranged in the upper airbag group (105) and the lower airbag group (106). The radian of the support frame (115) is the same as that of the upper airbag group (105) and the lower airbag group (106). Mounting ports (117) are arranged in an array on one side surface of the support frame (115). Rollers (116) are arranged in the mounting ports (117).

10. The leg circumference measurement device for preventing lower extremity deep vein thrombosis in bedridden children according to claim 9, wherein: A guide rod (118) is also arranged on one side of the support frame (115). The guide rod (118) is movably arranged on one side of the upper airbag group (105) and the lower airbag group (106). A return spring (119) is sleeved on the guide rod (118).

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