A method for preparing a flexible sensor and a method for detecting human body pressure

Abstract

The present invention discloses a method for preparing a flexible sensor and a method for detecting human body pressure, which include the following steps: S1: 3D contour scanning of a part to be corrected and obtaining the three-dimensional geometric dimensions of the part to be corrected, and establishing a three-dimensional model of the part to be corrected in the software; S2: UV development of the three-dimensional model of the part to be corrected to obtain at least one plane figure; S3: making a flexible sensor according to the plane figure obtained in S2. The flexible sensor is then worn on the surface of the corrected part, and then a uniform external force is applied. The stress change data of the part to be corrected is obtained through pressure feedback, and the orthopedic stress confrontation point is obtained by analysis. Finally, the flexible sensor and the patient's orthopedic brace are packaged. The invention uses a flexible sensor to detect the corrected part in real time, and the flexible sensor is built into the inner side of the orthopedic brace to monitor the patient's wearing of the brace and the orthopedic changes in real time, so that the brace can accurately adapt to the patient's orthopedic part and improve comfort.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible sensor applications, and in particular to a method for preparing a flexible sensor and a method for detecting human body pressure. Background Art

[0002] When the human spine is scoliotic or fractured, or the wrist, elbow, ankle, knee and other joints are dislocated and injured, it is necessary to wear an orthotic / fixation brace for a long time. However, during the wearing of the orthotic / fixation brace, changes in bone growth and development often lead to a mismatch between the brace and the patient, resulting in low patient compliance; or because the doctor or the patient's family cannot monitor during the wearing of the brace, the patient frequently fails to wear the brace effectively according to the doctor's instructions, resulting in poor treatment results; secondly, the screening and treatment of skeletal orthopedic diseases have always relied on the patient's subjective feedback and the doctor's experience and judgment. Although X-rays can reflect the condition of the patient's damaged parts to a certain extent, they are always two-dimensional detection methods. They lack the ability to three-dimensionally identify the changes in internal stress of human joint tissues and other parts after damage, making it impossible to accurately make orthotic braces and generate corresponding resistance. Summary of the invention

[0003] In view of the problem in the prior art that the orthopedic / fixed brace cannot accurately fit the part to be corrected / fixed, the present invention proposes a method for preparing a flexible sensor and a method for detecting human body pressure. The flexible sensor is manufactured by scanning data of the part to be corrected / fixed, and the flexible sensor is packaged with the orthopedic / fixed brace, and the force information of the part to be corrected / fixed is detected in real time by the flexible sensor, so that the orthopedic / fixed brace can be adjusted at any time to accurately fit the part to be corrected / fixed.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A method for preparing a flexible sensor comprises the following steps:

[0006] S1: Perform 3D contour scanning on the part to be corrected / fixed to obtain the three-dimensional geometric dimensions of the part to be corrected / fixed, and establish a three-dimensional model of correction / fixation;

[0007] S2: Perform UV unfolding on the orthopedic / fixed model to obtain at least one plane figure;

[0008] S3: Make a flexible sensor according to the plane pattern obtained in S2.

[0009] Preferably, in S2, the orthopedic model is imported into the 3D software, the "UV unfolding" function is selected, and the boundary line to be unfolded is selected on the orthopedic model. After confirmation, the 3D software automatically divides the orthopedic model into at least one plane figure.

[0010] Preferably, S3 comprises the following steps:

[0011] S3-1: cutting / cutting the first material and the second material in a 1:1 ratio according to any plane pattern obtained in S2 to obtain a first base material and a second base material;

[0012] S3-2: printing on the suede surface of the first base material to obtain a force-sensitive resistor matrix, and then spraying nanoparticles on the suede to form a printed force-sensitive leather layer;

[0013] S3-3: printing interdigital electrodes on any surface of the second base material, and then arranging a hot melt film spacer layer on the same surface to obtain a printed circuit fabric layer;

[0014] S3-4: Encapsulate the printed force-sensitive leather layer and the printed circuit fabric layer to obtain a flexible sensor.

[0015] Preferably, in S3-1, the first material is a leather material with a thickness of 0.5 mm-3 mm, and the second material is a textile woven from "copper wire core-spun yarn" with a twist of 1000-1500.

[0016] Preferably, in S3-2, an electrostatic printing process is used to evenly and firmly adhere the force-sensitive slurry to the velvet surface; the force-sensitive slurry is a mixed solution of graphene conductive slurry and polyurethane solvent in a ratio of 1:2.

[0017] Preferably, in S3-2, the nanoparticles are silicon dioxide nanoparticles with a particle size of 2 micrometers to 100 micrometers. By controlling the concentration of printed silicon dioxide nanoparticles, the sensitivity of the sensor can be adjusted, and the wear resistance and reliability can be increased.

[0018] Preferably, in S3-3, the material of the hot melt film spacer layer is TPU or PA hot melt film adhesive. By controlling the thickness of the hot melt film spacer layer, the curves of different parts of the human body can be matched, so that the opening values ​​and pre-pressure values ​​of all sensing points remain relatively consistent.

[0019] The present invention also provides a method for detecting human body orthopedic pressure, comprising the following steps:

[0020] A1: After the flexible sensor prepared according to the above method is tightly attached to the part to be corrected, a standard brace or splint is used to apply a uniform force to it;

[0021] A2: The flexible sensor inputs the collected pressure data into the terminal for data analysis. The input pressure data includes obtaining the position, size and area; obtaining the position and pressure size information of the confrontation point with the standard brace or splint;

[0022] A3: Manufacture a dedicated orthopedic brace based on the real-time pressure data collected by the flexible sensor obtained in A2, the position and pressure information of the confrontation point with the standard brace or splint, and the 3D geometric dimensions of the part to be corrected;

[0023] A4: The flexible sensor is used as a lining material and is packaged and integrated with a dedicated orthopedic brace to obtain an orthopedic brace with a flexible sensor lining;

[0024] A5: Wear an orthotic brace with a flexible sensor lining on the part to be tested to detect the pressure in real time.

[0025] Preferably, in A5, when the displayed pressure value is uniform and there is no prominent pressure point, the wearing state of the orthotic brace is defined as a normal state;

[0026] When the pressure points display uneven pressure values ​​due to bone growth and development / accidental secondary damage, or the pressure value changes to 0 instantly due to removal / removal of the orthotic brace, it is an abnormal state. The user will be reminded through the mobile phone APP / SMS that the orthotic brace needs to be adjusted until the pressure values ​​at all pressure points are uniform.

[0027] In summary, due to the adoption of the above technical solution, compared with the prior art, the present invention has at least the following beneficial effects:

[0028] The present invention manufactures a flexible sensor by scanning data of the part to be corrected. The flexible sensor adopts a three-layer structure and has air permeability, stretchability and skin-fitting properties. At the same time, graphene, silver and the like are printed as conductive materials to increase certain antibacterial properties.

[0029] The flexible sensor can be used to accurately screen abnormal bone growth and development in early adolescents, reducing the cost and difficulty of screening for orthopedic diseases. At the same time, the flexible sensor and the patient's orthotic brace can be packaged for daily wear by the patient, and it has the function of real-time detection of stress changes in the part to be corrected. When an abnormal state occurs, it can be adjusted in time so that the orthotic brace can accurately fit the part to be corrected.

[0030] By dynamically recording the changes in patients' data from early screening to daily wearing and then to follow-up visits in the rehabilitation stage, and integrating orthopedic pressure data change information and multi-dimensional data types such as X-rays, we will eventually establish a large database for the treatment of different types of orthopedic cases, further normalize the screening and brace treatment process for this type of disease, and reduce subjectivity and blindness. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of a method for preparing a flexible sensor according to an exemplary embodiment of the present invention;

[0032] Figure 2is a schematic diagram of a flexible sensor structure according to an exemplary embodiment of the present invention;

[0033] Figure 3 A schematic diagram of a human body pressure detection method according to an exemplary embodiment of the present invention;

[0034] Figure 4 It is a schematic structural diagram of a splint according to an exemplary embodiment of the present invention acting on a flexible sensor and a part to be corrected in close contact.

[0035] Figure 5 Schematic diagram of a wearing structure of an orthopedic brace with a flexible sensor lining according to an exemplary embodiment of the present invention.

[0036] Figure 6 Schematic diagram of the wearing structure of an external fixation brace with a flexible sensor lining according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with the examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following examples, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0038] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] like Figure 1 As shown, the present invention provides a method for preparing a flexible sensor, comprising the following steps:

[0040] S1: Perform 3D contour scanning on the part to be corrected to establish a 3D corrective model, and simultaneously obtain the 3D geometric dimensions of the part to be corrected;

[0041] In this embodiment, 3D scanning technology and 3D software can be used to scan the part to be corrected and establish a three-dimensional model.

[0042] S2: Preprocessing (such as UV development) the orthopedic model using 3D software (such as 3DMAX software) to obtain at least one plane figure.

[0043] In this embodiment, because the orthopedic model is 3D, it is not convenient to manufacture and attach the flexible sensor. Therefore, the orthopedic model needs to be split into multiple plane figures that can be spliced ​​together to improve the efficiency and accuracy of orthopedic brace manufacturing.

[0044] In this embodiment, the orthopedic model is imported into the 3D software, the "UV unfolding" function is selected, and the boundary lines to be unfolded (which may be one or more) are selected on the orthopedic model. After confirmation, the 3D software automatically divides the orthopedic model into multiple plane figures.

[0045] S3: Make a corresponding flexible sensor according to the plane figure obtained in S2.

[0046] In this embodiment, there is at least one plane figure obtained in S2, so corresponding flexible sensors need to be manufactured according to different plane figures. The manufacturing method of each flexible sensor is the same, so the manufacturing of one of the flexible sensors is specifically described.

[0047] like Figure 2 As shown, the flexible sensor includes a three-layer structure: a printed force-sensitive leather layer, a hot-melt film spacer layer, and a printed circuit fabric layer.

[0048] S3-1: cutting / cutting the first material and the second material in a 1:1 ratio according to any plane pattern obtained in S2 to obtain a first base material 1 and a second base material 3 for printing a sensor device;

[0049] In this embodiment, the first material is a leather material with a thickness of 0.5 mm to 3 mm, and the second material is a textile woven from "copper wire core-spun yarn" with a twist of 1000 to 1500.

[0050] S3-2: Printing on the suede surface of the first base material 1 obtains a force-sensitive resistor matrix, and then spraying nanoparticles 2 on the suede to form a printed force-sensitive leather layer.

[0051] In this embodiment, an "electrostatic printing" process is used to print a force-sensitive resistor matrix on the velvet surface of the first base material. The printed force-sensitive slurry is a mixed solution of graphene conductive slurry and polyurethane solvent in a certain ratio: an electric field is formed between the electrostatic nozzle and the metal substrate, and the first base material to be printed is placed with the velvet surface facing up in the electric field. The graphene mixed slurry is sprayed on the velvet surface of the first base material through the electrostatic nozzle. Due to the existence of the electric field, the graphene slurry can cover and penetrate into the deep layer of the velvet more evenly. Traditional printing can only spray the graphene slurry on the surface of the velvet, which is easy to fall off, and there are problems such as uneven printing and poor printing quality.

[0052] The method of forming a force-sensitive resistor matrix by printing: by making a film with matrix holes and covering it on the surface of the base material for printing, or directly setting the "matrix printing parameters" in the printer to obtain the desired matrix effect), the force-sensitive resistor matrix formed can obtain the maximum / minimum pressure information and concentrated pressure point location information, etc. through the different pressure signals received by different array units in the matrix during the actual acquisition process.

[0053] In this embodiment, the velvet surface is selected as the printing surface because the velvet surface has a three-dimensional structure and can increase the sensitivity of the sensor module.

[0054] In this embodiment, the nanoparticles 2 can select silica nanoparticles (particle size between 2 microns and 100 microns) as the dielectric spacer layer. At the same time, silica can effectively improve the overall wear resistance and reliability of the printed force-sensitive leather layer, and by adjusting the concentration of the printed silica nanoparticles, the sensitivity adjustment and the hot melt mold spacer layer thickness control opening value can be achieved. That is, the pressure data will only be collected when the pressure reaches the opening value, which can avoid collecting the pressure of accidental contact.

[0055] Because the flexible sensor described in the present invention is a flexible thin film pressure sensor attached to the surface of the human body, and the biggest difficulty in fitting the flexible sensor to the human body is that different parts of the human body are irregular, irregular and heterogeneous surfaces, and the curvatures of adjacent surfaces are not the same. At the same time, the initial pre-pressure given to the sensor is also different, which leads to the array sensor obtained by plane printing, and each of its sensing units has a different responsiveness to the pressure signal. By spraying silica nanoparticles, the sensitivity of different areas of the sensor can be adjusted, and the initial performance of all points of the sensor can be maintained at a relatively consistent level as much as possible; at the same time, spraying silica can increase the wear resistance of the leather material, which has a beneficial effect on the flexible sensing module being later set in the orthopedic brace for daily wear by the patient to maintain the acquisition performance of the sensor.

[0056] S3-3: Printing interdigitated electrodes 4 (the material may be graphene or silver) on any surface of the second base material 3, and then arranging hot-melt film spacer layers 6 on the same surface to obtain a printed circuit fabric layer.

[0057] The traditional approach is to print interdigital electrodes and lead wires on textiles, and then find a way to solder the lead wires to the circuit board. However, because the printed lead wires are thin and dense, there are great reliability issues when soldering them to the circuit board.

[0058] In this embodiment, since the hot-melt film spacer layers 6 are arranged on the surface of the second base material 3 (for example, the distance between the two hot-melt film spacer layers is d), at least two isolated interdigital electrode regions can be obtained.

[0059] In this embodiment, the interdigital electrode pins in each interdigital electrode region are punched and spot welded, the interdigital electrode 5 pins are welded to the inner core of the copper yarn 4, and then the other end of the copper yarn 4 is connected to the signal acquisition circuit through a corresponding relationship, and a complete closed-loop pressure acquisition circuit can be obtained, which is used to transmit the force-sensitive array and contact resistance change information collected by the interdigital electrodes to the circuit board, which solves the problem of welding between the printed electrode and the acquisition circuit board to a certain extent. That is to say, the copper wire core-wrapped yarn serves as both the textile structure line of the fabric layer and the conductor of the sensor itself.

[0060] In this embodiment, the opening value of the sensor module can be effectively adjusted by setting the mesh density (i.e., the number of hot-melt film spacing layers). Because the piezoresistive sensor may have small data fluctuations due to operations such as accidental contact, the number of hot-melt film spacing layers can be adjusted so that the pressure contacted by the sensor reaches the opening value, and the pressure can be collected.

[0061] S3-4: Encapsulate the printed force-sensitive leather layer and the printed circuit fabric layer to obtain a flexible sensor.

[0062] In this embodiment, heating is performed by a high-temperature pressing machine so that the hot-melt film spacer layer closely adheres the printed force-sensitive leather layer and the printed circuit fabric layer.

[0063] In this embodiment, the material of the hot-melt film spacer layer can be hot-melt film adhesive made of TPU or PA, which can well bond leather and fabric together.

[0064] In this embodiment, the flexible sensor is breathable, stretchable and skin-friendly, and graphene, silver, etc. are printed as conductive electrodes, which increases certain antibacterial properties.

[0065] Based on the flexible sensor obtained above, Figure 3 As shown, the present invention provides a human body pressure detection method based on a flexible sensor, comprising the following steps:

[0066] A1: After the flexible sensor is tightly fitted to the part to be corrected, a uniform external force is then applied by adding a standard brace / splint.

[0067] In this embodiment, since the flexible sensor is manufactured by collecting the 3D geometric dimensions of the part to be corrected, it can fit closely therewith. After wearing the standard brace / splint, the scoliotic part bulges out and correspondingly resists the standard brace / splint, so that the sensor is squeezed and the pressure data changes.

[0068] A2: The flexible sensor transmits the collected pressure data to the terminal to obtain the position, size and area of ​​the orthopedic stress resistance point.

[0069] In this embodiment, the force-sensitive resistor matrix on the printed force-sensitive leather layer of the flexible sensor can obtain maximum / minimum pressure information and pressure point location information, etc. through the different pressure signals received by different array units in the matrix during the actual data collection process, and then transmit the pressure signal to the collection circuit through the interdigitated electrodes and copper yarn on the printed circuit fabric layer, convert it into pressure data, and then transmit it to the terminal.

[0070] A3: A dedicated orthopedic brace is manufactured based on the pressure data collected in real time by the flexible sensor obtained in A2, the position and pressure information of the confrontation point with the standard brace or splint, and the 3D geometric dimensions of the part to be corrected.

[0071] In this embodiment, it is necessary to analyze whether there are points or areas with greater pressure. When customizing the orthotic brace, the points or areas need to be provided with protruding structures to impart a certain resistance force to restore the orthotic brace to a normal state.

[0072] A4: The flexible sensor is used as a lining material and is packaged and integrated with a dedicated orthopedic brace to obtain an orthopedic brace with a flexible sensor lining.

[0073] In this embodiment, the corresponding orthopedic mold can be first manufactured according to the plane figure, and then the flexible sensor can be mounted inside the orthopedic mold. Finally, multiple orthopedic molds with flexible sensors are spliced ​​according to the overlapping relationship of the restored UV segmentation boundaries to obtain an orthopedic brace with a flexible sensor lining.

[0074] A5: Wear an orthotic brace with a flexible sensor lining on the part to be tested to detect the pressure in real time.

[0075] like Figure 4 As shown, the flexible sensor 8 is first worn on the surface of human skin, and then a uniform external force is applied to it through a standard brace / splint 9. If scoliosis occurs in the spine 7, it will cause compression on any one or both sides of the human body, thereby forming one or more stress confrontation points.

[0076] In this embodiment, the pressure data displayed by the flexible sensor 8 can be analyzed to obtain information such as the pressure size and position distribution of the stress confrontation point. On the premise of collecting sufficient sample data, the big data algorithm can be used to identify whether any scoliosis patient sample has S-type or C-type scoliosis and the scoliosis angle or grade.

[0077] like Figure 5As shown, the orthopedic brace 10 with a flexible sensor lining (the flexible sensor is located on the inside) applies an inward orthopedic force in area A (the protruding part of the spine), and then the sensing point in area A where the flexible sensor is located is compressed to produce corresponding pressure data changes. The pressure data value collected when the orthopedic brace 10 is correctly worn for the first time is recorded as the "original value", and the pressure values ​​generated by changes such as wearing again or displacement of the brace at other times are recorded as "monitoring values".

[0078] In this embodiment, since the flexible sensor and the orthopedic brace are both made based on the 3D model data of the orthopedic part, the flexible sensor can be well fitted with the orthopedic brace without any wrinkles.

[0079] In this embodiment, the magnitude of the orthopedic force exerted by the orthopedic brace 10 on the A region is always different from the fixing force generated by fixing the brace on other parts, and generally the orthopedic force is greater than the fixing force.

[0080] In this embodiment, correctly wearing the brace for the first time means that the orthopedic force generated by the orthopedic brace 10 accurately acts on the protruding part of the scoliosis. At this time, the pressure, position, area and other information collected for the first time between the part and the brace are marked as the "original value" state. When the "monitoring value" undergoes "pressure change (large amplitude)", "position shift", "area reduction" or the "monitoring value" directly changes to "0" compared to the "original value" during daily wearing of the orthopedic brace 10, the system determines it as an "abnormal" state, and can remind the patient and the patient's family through mobile phone APP / text messages, notify the patient to put on the brace again or go to the hospital for a follow-up visit, and the orthopedic doctor will make a clinical diagnosis and adjust the brace. The adjusted "original value" should be the pressure data collected when the orthopedic brace 10 is correctly worn for the first time after the brace is adjusted.

[0081] like Figure 6 As shown, the present invention provides a method for implementing external fixation of ankle joint injuries based on flexible sensors: the flexible sensor 8 is fixed to the inner side of the plaster / splint 11, and then it is worn around the ankle injury site.

[0082] In this embodiment, the forces 1 and 2 in different directions generated by the plaster / splint 11 fixing the injured part of the foot and ankle can be monitored and distinguished on a daily basis through the flexible sensor 8. The pressure data collected when the plaster / splint 11 is worn for the first time is recorded as the "original value", and the rest of the time the plaster / splint 11 is worn is recorded as the "monitoring value". When the monitoring value changes over a long period of time compared with the original value, the system determines that the plaster / splint 11 is in an "abnormal" wearing state, and can remind the patient and his / her family through mobile phone APP / text messages, notify the patient to put on the plaster / splint 11 again or go to the hospital for a follow-up visit. After the orthopedic surgeon makes a clinical diagnosis, the plaster / splint 11 is adjusted, and the adjusted "original value" should be the pressure data value collected when the plaster / splint 11 is worn correctly for the first time after the adjustment.

[0083] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A method for preparing a flexible sensor, characterized in that: The following steps are involved: S1: Perform 3D contour scanning on the part to be corrected to obtain the three-dimensional geometric dimensions of the part to be corrected, and establish a three-dimensional corrective model; S2: Perform UV unfolding on the orthopedic model to obtain at least one plane figure; S3: making a flexible sensor according to the plane pattern obtained in S2; The S3 comprises the following steps: S3-1: cutting / cutting the first material and the second material in a 1:1 ratio according to any plane pattern obtained in S2 to obtain a first base material and a second base material; S3-2: printing on the suede surface of the first base material to obtain a force-sensitive resistor matrix, and then spraying nanoparticles on the suede to form a printed force-sensitive leather layer; A force-sensitive resistor matrix is ​​formed by making a film with matrix holes and covering it on the surface of the first base material for printing, and then the maximum / minimum pressure information and pressure point position information can be obtained through the difference in pressure signals received by different array units in the matrix; S3-3: printing interdigital electrodes on any surface of the second base material, and then arranging a hot melt film spacing layer on the same surface to form at least two isolated interdigital electrode areas to obtain a printed circuit fabric layer; S3-4: Encapsulate the printed force-sensitive leather layer and the printed circuit fabric layer to obtain a flexible sensor.

2. The method for preparing a flexible sensor according to claim 1, characterized in that: In S2, the orthopedic model is imported into the 3D software, the "UV unfolding" function is selected, and the boundary line to be unfolded is selected on the orthopedic model. After confirmation, the 3D software automatically divides the orthopedic model into at least one plane figure.

3. The method for preparing a flexible sensor according to claim 1, characterized in that: In S3-1, the first material is a leather material with a thickness of 0.5 mm-3 mm, and the second material is a textile woven from copper wire core-spun yarn with a twist of 1000-1500.

4. The method for preparing a flexible sensor according to claim 1, characterized in that: In the S3-2, an electrostatic printing process is used to evenly and firmly adhere the force-sensitive slurry to the velvet surface; the force-sensitive slurry is a mixed solution of graphene conductive slurry and polyurethane solvent in a ratio of 1:

2.

5. The method for preparing a flexible sensor according to claim 1, characterized in that: In the S3-2, the nanoparticles are silicon dioxide nanoparticles with a particle size of 2 microns to 100 microns; by controlling the concentration of the printed silicon dioxide nanoparticles, the sensitivity of the sensor is adjusted to increase the wear resistance and reliability.

6. The method for preparing a flexible sensor according to claim 1, characterized in that: In S3-3, the material of the hot melt film spacer layer is TPU or PA hot melt film adhesive. By controlling the thickness of the hot melt film spacer layer, the curves of different parts of the human body are matched so that the opening values ​​and pre-pressure values ​​of all sensing points remain relatively consistent.

7. The method for preparing a flexible sensor according to claim 1, characterized in that: In the S3-3, the forked electrode pins in each forked electrode area are punched and spot welded, the forked electrode pins are welded to the inner core of the copper wire core-covered yarn, and then the other end of the copper wire core-covered yarn is connected to the signal acquisition circuit to obtain a complete closed-loop pressure acquisition circuit, that is, the copper wire core-covered yarn serves as the textile structure line of the fabric layer and as the conductor of the sensor itself; the pressure acquisition circuit is used to transmit the force-sensitive array and contact resistance change information collected by the forked electrodes to the acquisition circuit board.

8. A method for detecting human body pressure, characterized in that: The following steps are involved: A1: After the flexible sensor prepared by the method according to claims 1 to 7 is closely attached to the part to be corrected, a uniform force is applied thereto; A2: The flexible sensor transmits the collected pressure data to the terminal to obtain the position, size and area of ​​the orthopedic stress resistance point; A3: Manufacture an orthopedic brace based on the pressure data collected in real time by the flexible sensor obtained in A2, the position of the confrontation point with the standard brace or splint, the pressure size information, and the 3D geometric dimensions of the part to be orthopedic; A4: The flexible sensor is used as a lining material and is packaged and integrated with the orthopedic brace to obtain an orthopedic brace with a flexible sensor lining; A5: Wear an orthotic brace with a flexible sensor lining on the part to be tested to detect the pressure in real time.

9. A human body pressure detection method as claimed in claim 8, characterized in that: In A5, when the displayed pressure value is uniform and there is no prominent pressure point, the wearing state of the orthotic brace is defined as a normal state; When the pressure points display uneven pressure values ​​due to bone growth and development / accidental secondary damage, or the pressure value changes to 0 instantly due to removal / removal of the orthotic brace, it is an abnormal state. The user will be reminded through the mobile phone APP / SMS that the orthotic brace needs to be adjusted until the pressure values ​​at all pressure points are uniform.

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