Self-powered wearable system for dynamically monitoring foot pressure distribution

Abstract

The invention discloses a self-powered wearable system for dynamically monitoring foot pressure distribution, which converts low-frequency linear motion during walking of a human body into high-frequency rotary motion to drive a brushless generator to generate power so as to realize self-power supply; meanwhile, the compression springs and flexible materials outside the device can absorb sole impact, disperse pressure, adjust supporting force and relieve foot fatigue. The intelligent insole collects plantar pressure and stride frequency data in real time and uploads the plantar pressure and stride frequency data to the gait recognition and early warning system based on the deep neural network through the data transmission circuit, the system can recognize abnormal gaits such as foot ectropion in real time and give an early warning at a client side, and a gait analysis report is provided after a walking period is finished to assist a user in self-correction. Compared with traditional equipment, the system breaks through the limitation that the size is large and an external power source is needed, self-energy-supply, personalized buffering and dynamic gait monitoring are achieved, the energy endurance problem of wearable equipment is solved, and a new thought is provided for digital medical treatment of self-prevention and diagnosis on the basis of patients in the future.

Description

Technical Field

[0001] This invention relates to the field of foot pressure distribution monitoring technology, and more specifically to a self-powered wearable system for dynamic monitoring of foot pressure distribution. Background Technology

[0002] Walking, as the most basic form of human movement, involves a distribution of plantar pressure that is closely related to the body's physiological and pathological states. However, when the body is in a pathological state, such as suffering from diabetes, nerve damage, or foot deformities, the dynamic balance of walking is disrupted, leading to pathological changes in foot weight-bearing and resulting in significant alterations in plantar pressure distribution.

[0003] In the medical field, continuous and dynamic gait monitoring plays an irreplaceable role in the early screening and rehabilitation assessment of various diseases. Taking plantar fasciitis as an example, by monitoring the distribution of pressure on the sole of the foot, patients can promptly identify areas of abnormal pressure, allowing for early intervention and prevention of plantar fasciitis. Furthermore, dynamic plantar pressure monitoring data can provide crucial scientific evidence for tracking the rehabilitation progress of patients with heart failure, Parkinson's disease, and stroke, as well as for health management and fall warning in the elderly. In sports science, athletes' technical movements are closely linked to the pressure distribution of the foot on the ground. By analyzing the real-time changes in plantar pressure during exercise, the rationality of athletes' technical movements can be thoroughly evaluated, providing data support for movement optimization, helping athletes improve their competitive performance, and also helping to prevent sports injuries.

[0004] While plantar pressure distribution measurement technology is of great significance in fields such as medicine and sports, current sensor platforms have many limitations. Traditional plantar pressure measurement devices are often bulky and complex, limiting their use to indoor or clinical environments, which greatly restricts their application scenarios and ease of use. Moreover, most devices require an external power supply, which not only increases the complexity and cost of use, but also affects portability and wearing comfort to some extent. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems by providing a self-powered wearable system for dynamic monitoring of foot pressure distribution. Based on dynamic foot parameters, a personalized foot pressure cushioning device is designed to redistribute foot pressure, thereby alleviating plantar fasciitis. Furthermore, high-power human energy harvesting is achieved based on electromagnetic generation and frequency conversion principles, enabling the foot data acquisition and transmission system to be self-powered. Client-side alerts via a gait recognition and warning system improve the convenience and feasibility for users to adjust lower limb alignment and correct gait after wearing the device.

[0006] The technical solution of the present invention is as follows: A self-powered wearable system for dynamic monitoring of foot pressure distribution includes: The foot cushioning assist device includes a linear-rotational motion conversion module, a gear speed-increasing transmission module, a compression spring, and a brushless motor. The device converts the kinetic energy during walking into electrical energy. Smart insoles based on flexible piezoelectric sensors can collect and record step frequency and plantar pressure data in real time; The energy storage and management module stores and manages the energy collected by the foot cushioning device. The data transmission circuit module operates based on the electrical energy output from the energy storage and management module, and uploads the gait frequency and pressure data collected by the smart insole based on piezoelectricity and triboelectricity to the client's gait recognition and early warning system. The gait recognition and early warning system displays foot pressure distribution in real time and uses deep neural networks to perform gait recognition, providing timely terminal warnings for abnormal gait.

[0007] Through the aforementioned system, the foot cushioning device supports the arch of the foot, thereby effectively increasing the pressure-bearing area on the sole, dispersing foot pressure, and reducing foot fatigue. The height of the foot cushioning device can be adjusted according to individual differences such as the user's foot contour and weight, thus changing the support force to meet personalized needs. Furthermore, this foot cushioning device converts the kinetic energy generated during walking into electrical energy. The electrical energy generated by the foot cushioning device powers the energy storage and management circuit, data acquisition circuit, and gait recognition and early warning module for autonomous operation. A flexible piezoelectric sensor array and data acquisition circuit can collect foot pressure signals in real time and transmit the pressure data to the gait recognition and early warning system. This system can display the foot pressure distribution in real time and use a deep neural network to perform gait recognition, providing timely terminal warnings for abnormal gait, thereby assisting users in actively correcting abnormal gait.

[0008] Furthermore, the linear-rotational motion conversion module converts kinetic energy into electrical energy for the brushless motor through a gear speed-increasing transmission module and a compression spring. The linear-rotational motion conversion module includes a sleeve and a ball screw transmission module, with the sleeve fitted around the nut of the ball screw transmission module. When the sleeve is subjected to pressure, the sleeve and the nut of the ball screw transmission module rotate together and move downward, driving the screw of the ball screw transmission module to rotate around its own central axis, thus converting linear motion into rotational motion.

[0009] Furthermore, the ball screw transmission module also includes balls; a compression spring is provided between the lower surface of the nut and the drive gear of the gear speed-increasing transmission module, and the screw passes through the central hole of the compression spring and restricts the radial movement of the compression spring; when the sleeve moves downward or upward together with the nut in the ball screw transmission module, the compression spring is axially compressed or restored.

[0010] The aforementioned structure allows for the adjustment of the support force of the compression spring and the extension height of the sleeve, meeting the individualized support needs of different users. The foot cushioning device includes a transmission module that converts low-frequency vibrations into high-frequency rotation to collect energy during walking, thus improving the efficiency of walking.

[0011] Furthermore, the D-shaped shaft end of the lead screw is interference-fitted with the D-shaped center hole of the drive gear, so that the lead screw and the drive gear in the ball screw transmission module rotate synchronously.

[0012] Furthermore, the drive gear teeth mesh with the lower gear teeth of the secondary gear, driving the secondary gear to rotate; the upper gear teeth of the secondary gear mesh with the upper gear teeth of the tertiary gear, driving the tertiary gear to rotate; the upper gear teeth of the tertiary gear mesh with the upper gear teeth of the quaternary gear, driving the quaternary gear to rotate; the upper gear teeth of the quaternary gear mesh with the upper gear teeth of the quaternary gear, driving the tertiary gear to rotate; the quinary gear is connected to the input shaft of the brushless motor. Furthermore, the drive gear, secondary gear, tertiary gear, and quaternary gear are respectively clearance-fitted with the stepped shaft. The stepped shaft restricts the radial movement of the gears while retaining their rotational movement. The axial movement of the drive gear, secondary gear, tertiary gear, and quaternary gear is respectively restricted by the shoulder of the stepped shaft and the shaft end retaining ring in the upper groove of the stepped shaft.

[0013] Furthermore, the outer frame of the foot cushioning auxiliary device includes a shell, an end cap, and a base plate. The shell and the end cap are both made of soft material and covered with a silicone layer. The holes on the base plate are fitted with the stepped shaft to restrict the radial movement of the stepped shaft. The shoulder of the stepped shaft and the shaft end retaining ring in the groove at the bottom of the stepped shaft restrict the axial movement of the stepped shaft.

[0014] Furthermore, the brushless motor includes a motor housing, a motor coil, and a motor magnet. The center hole of the five-stage gear is interference-fitted with the brushless generator to achieve synchronous rotation of the five-stage gear and the input shaft of the brushless generator, thereby enabling the brushless generator to start generating electricity. When the input shaft of the brushless motor starts to rotate, the input shaft drives the brushless motor coil to rotate synchronously. The brushless motor housing and the brushless motor magnet serve as the stator, and the brushless motor coil serves as the rotor, rotating relative to the stator to generate electricity, thus completing the conversion of kinetic energy into electrical energy.

[0015] Furthermore, the smart insole includes a mesh BK fabric layer, a flexible piezoelectric sensing layer, and an EVA layer. The flexible piezoelectric sensing layer works based on the principle of the piezoelectric effect. The main material of the flexible piezoelectric sensing layer is a piezoelectric material. When the piezoelectric material is subjected to a load, it becomes polarized, separating positive and negative charges. This causes the upper and lower surfaces of the piezoelectric material to generate charges of opposite polarity and equal magnitude, forming a potential difference, thereby recording the magnitude of the pressure.

[0016] Furthermore, the gait recognition and early warning system processes data through the convolutional, pooling, and fully connected layers of a deep neural network, mapping foot data to gait to achieve gait recognition; when an abnormal gait is detected, the gait recognition and early warning system will issue a reminder on the user's client.

[0017] Through the aforementioned system, the gait recognition and early warning system is used to identify and analyze the redistribution of pressure on the soles of the feet after the user wears the device, thereby providing early warnings for abnormal gait (such as pronation) and enabling users to self-correct incorrect gait. The self-powered dynamic foot pressure distribution monitoring system for wearable devices solves the power consumption problem of traditional wearable devices and also provides a new approach for future patient-based digital healthcare for self-prevention and diagnosis.

[0018] Compared with existing technologies, the advantages of this invention are: 1. A foot pressure monitoring, gait recognition and terminal early warning system with self-powered capability is proposed to assist users in actively identifying and self-correcting abnormal gait; 2. A multifunctional wearable device that combines foot cushioning and foot motion energy harvesting is proposed, which can effectively improve the comfort and energy utilization efficiency of the human body during walking. 3. By adopting a linear-to-rotational motion conversion and gear speed-increasing transmission mechanism, efficient and high-power energy capture is achieved. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the wearable device for the system described in this application.

[0020] Figure 2 This is a schematic diagram of the foot cushioning auxiliary device of this application.

[0021] Figure 3 This is a cross-sectional view of the foot cushioning auxiliary device of this application.

[0022] Figure 4 This is a cross-sectional view of the ball screw drive module of this application.

[0023] Figure 5 This is a cross-sectional view of the gearbox and brushless motor of this application. Figure 6This is an exploded view of the smart insole of this application.

[0024] Figure 7 This is a framework diagram of the plantar data acquisition and transmission system of this application.

[0025] Figure 8 This is a circuit diagram of the wearable device of this application.

[0026] Figure 9 This is a flowchart illustrating the gait recognition and early warning process of this application.

[0027] Figure 10 This is the interface for gait recognition and early warning in this application.

[0028] Figure 11 This is a flowchart illustrating the workflow of the wearable device described in this application.

[0029] Reference numerals: 1-Foot cushioning auxiliary device, 101-Outer shell, 102-End cap, 103-Sleeve, 104-Ball screw drive module, 1041-Nut, 1042-Ball, 1043-Screw, 105-Compression spring, 1061-Drive gear, 1062-Secondary gear, 1063-Third gear, 1064-Fourth gear, 1065-Fifth gear, 1066-Stepped shaft, 1067-Shaft end retaining ring, 107-Brushless motor, 1071-Motor shell, 1072-Motor coil, 1073-Motor magnet, 108-Base plate; 2-Smart insole, 201-Mesh BK fabric layer, 202-Flexible piezoelectric sensing layer, 203-EVA layer; 3-Energy storage and management module; 4-Data transmission circuit module; 5-Gait recognition and early warning module. Detailed Implementation

[0030] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0032] Please see Figure 1-11 A self-powered wearable system for dynamic monitoring of foot pressure distribution, such as Figure 1 As shown, it includes: The foot cushioning assist device 1 includes a linear-rotational motion conversion module, a gear speed-increasing transmission module, a compression spring 105, and a brushless motor 107. The device converts the kinetic energy during walking into electrical energy. The smart insole 2, based on flexible piezoelectric sensing, collects and records step frequency and plantar pressure data in real time; Energy storage and management module 3 stores and manages the energy collected by foot cushioning device 1; The data transmission circuit module 4 works based on the electrical energy output by the energy storage and management module 3, and uploads the gait frequency and pressure data collected by the smart insole 2 based on piezoelectricity and triboelectricity to the client's gait recognition and early warning system 5. The gait recognition and early warning system 5 displays foot pressure distribution in real time and uses a deep neural network to complete gait recognition, providing timely terminal warnings for abnormal gait.

[0033] like Figure 3 As shown, the linear-rotational motion conversion module converts kinetic energy into electrical energy for the brushless motor 107 via a gear speed-increasing transmission module and a compression spring 105. The linear-rotational motion conversion module includes a sleeve 103 and a ball screw transmission module 104. The sleeve 103 is fitted onto the outside of the nut 1041 of the ball screw transmission module 104. During the initial stages of walking, the foot gradually contacts the ground, and the sole of the foot applies pressure to the upper surface of the sleeve 103, causing the sleeve 103 and the nut 1041 of the ball screw transmission module 104 to rotate downwards together. This drives the screw 1043 of the ball screw transmission module 104 to rotate around its central axis, thus converting linear motion into rotational motion. The radial movement of both the sleeve 103 and the ball screw transmission module 104 is limited by the holes in the end cap 102.

[0034] like Figure 4As shown, the ball screw transmission module 104 also includes a ball 1042; a compression spring 105 is provided between the lower surface of the nut 1041 and the drive gear 1061 of the gear speed-increasing transmission module, and the screw 1043 passes through the center hole of the compression spring 105 and restricts the radial movement of the compression spring 105, so that the compression spring can intelligently perform axial compression and recovery; when the sleeve 103 moves downward or upward together with the nut 1041 in the ball screw transmission module 104, the compression spring 105 performs axial compression or recovery. As the foot gradually contacts the ground, the sleeve 103 and the nut 1041 in the ball screw transmission module 104 move downward together. The compression spring 105 is axially compressed to absorb the impact force of the foot contacting the ground, thereby reducing the pressure on the sole of the foot. As the foot gradually leaves the ground, the sleeve 103 and the nut 1041 in the ball screw transmission module 104 move upward together. The compression spring 105 is axially restored, providing an upward thrust for the sleeve 103 and the nut 1043 in the ball screw transmission module 104, pushing the foot to lift off, thereby reducing the workload of the foot muscles and assisting the human body in walking.

[0035] The D-shaped shaft end of the lead screw 1043 is interference-fitted with the D-shaped center hole of the drive gear 1061, so that the lead screw 1043 and the drive gear 1061 in the ball screw transmission module 104 rotate synchronously.

[0036] like Figure 5 As shown, the teeth of drive gear 1061 mesh with the lower gear teeth of secondary gear 1062, driving secondary gear 1062 to rotate; the upper gear teeth of secondary gear 1062 mesh with the upper gear teeth of tertiary gear 1063, driving tertiary gear 1063 to rotate; the upper gear teeth of tertiary gear 1063 mesh with the upper gear teeth of quaternary gear 1064, driving quaternary gear 1064 to rotate; the upper gear teeth of quaternary gear 1064 mesh with each other, driving tertiary gear 1065 to rotate; quaternary gear 1065 is connected to the input shaft of brushless motor 107 for transmission. The drive gear 1061, the second-stage gear 1062, the third-stage gear 1063, and the fourth-stage gear 1064 are respectively clearance-fitted with the stepped shaft 1066. The stepped shaft 1066 restricts the radial movement of the gears while retaining the rotational movement of the gears. The axial movement of the drive gear 1061, the second-stage gear 1062, the third-stage gear 1063, and the fourth-stage gear 1064 is respectively restricted by the shoulder of the stepped shaft 1066 and the shaft end retaining ring 1067 in the upper groove of the stepped shaft 1066.

[0037] The stepped shaft 1066 is completely fixed to the base plate 108. The four threaded holes on the side of the base plate 108 correspond one-to-one with the four through holes of the outer casing 101. Bolts connect the base plate 108 to the outer casing 101, ensuring the stability of the base plate 108 and the stepped shaft 1066. The drive gear 1061 begins to rotate, and the second-stage gear 1062, third-stage gear 1063, and fourth-stage gear 1064 also rotate through gear meshing, ultimately transmitting the rotational motion to the fifth-stage gear 1065. The four through holes on the upper surface of the motor casing 1071 of the brushless generator 107 correspond one-to-one with the four threaded holes inside the outer casing 101, and are connected and fixed by bolts. The center hole of the fifth-stage gear 1065 is interference-fitted with the brushless generator 107, achieving synchronous rotation of the fifth-stage gear 1065 and the input shaft of the brushless generator 107, thereby enabling the brushless generator 107 to generate electricity, completing the conversion of kinetic energy into electrical energy.

[0038] like Figure 2 As shown, the outer frame of the foot cushioning auxiliary device 1 includes a housing 101, an end cap 102, and a base plate 108. Both the housing 101 and the end cap 102 are made of soft material and covered with a silicone layer, thereby achieving a uniform distribution of foot pressure. The hole on the base plate 108 is fitted with the stepped shaft 1066 to restrict the radial movement of the stepped shaft 1066. The shoulder of the stepped shaft 1066 and the shaft end retaining ring 1067 in the lower groove of the stepped shaft 1066 restrict the axial movement of the stepped shaft 1066.

[0039] The brushless motor 107 includes a motor housing 1071, a motor coil 1072, and a motor magnet 1073. The center hole of the five-stage gear 1065 is interference-fitted with the brushless generator 107 to achieve synchronous rotation of the five-stage gear 1065 and the input shaft of the brushless generator 107, thereby enabling the brushless generator 107 to start generating electricity. When the input shaft of the brushless motor 107 starts to rotate, the input shaft drives the brushless motor coil 1072 to rotate synchronously. The brushless motor housing 1072 and the brushless motor magnet 1073 serve as the stator, and the brushless motor coil 1072 serves as the rotor, rotating relative to the stator to generate electricity, thus completing the conversion of kinetic energy into electrical energy.

[0040] like Figure 6As shown, the smart insole 2 includes a mesh BK fabric layer 201, a flexible piezoelectric sensing layer 202, and an EVA layer 203. The mesh BK fabric layer 201, due to its porous structure, provides excellent breathability and sweat absorption. The flexible piezoelectric sensing layer 202 operates based on the piezoelectric effect. Its main material is a piezoelectric material. When the piezoelectric material is subjected to a load, it becomes polarized, separating positive and negative charges. This results in oppositely polar and equal charges on the upper and lower surfaces of the piezoelectric material, creating a potential difference that records the pressure value. Alternatively, the flexible piezoelectric sensing layer 202 can be replaced with a flexible piezoresistive sensing layer based on the piezoresistive principle, which also records the pressure value. The EVA layer 203 is primarily made of ethylene-vinyl acetate copolymer, which absorbs impact from the sole of the foot and ensures foot comfort. Another approach involves replacing the insole surface with a triboelectric nanosensing layer, primarily based on the principle of contact-separation triboelectric nanogenerators. The triboelectric nanosensing layer is mainly made of PTFE film, with a Cu film adhered to the bottom of the sock. Once contact is established between the PTFE and Cu films, a positive charge is generated on the Cu film surface, while an equal amount of negative charge is generated on the PTFE film surface. Subsequently, as the Cu and PTFE films begin to separate, the gap between the two triboelectric layers increases, creating a potential difference between the two electrodes. This potential difference drives electrons to flow from the top electrode to the bottom electrode, generating a current that increases until the separation distance between the two triboelectric layers reaches its maximum. When the distance between the Cu and PTFE films gradually decreases until they are in complete contact, free electrons flow from the bottom electrode back to the top electrode, generating a reverse current. The periodic contact and separation between the two surfaces of the Cu and PTFE films causes periodic electrical signal output from the triboelectric nanosensing layer, thereby recording the pressure data from human walking.

[0041] Figure 7 This is a structural diagram of a foot data acquisition and transmission system. The system mainly consists of a flexible piezoelectric sensing smart insole and a data transmission circuit module. The main functional parts of the flexible sensing insole are a mesh BK fabric layer, an EVA layer, and a flexible piezoelectric sensing layer. The flexible piezoelectric sensing layer records foot pressure data. The data transmission circuit module transmits gait frequency data and foot pressure data to the client's gait recognition and early warning system.

[0042] Figure 8 This is a circuit diagram of a wearable device in a self-powered foot pressure distribution dynamic monitoring system. The foot cushioning auxiliary device, also known as an energy harvesting device, converts the kinetic energy of walking into three-phase AC power. This AC power is then rectified by a rectifier bridge and filtered by capacitor C1 to become two-phase DC power, which is input to the TD1509 power management module to ultimately power the foot data acquisition and transmission system.

[0043] like Figure 9 , Figure 10 , Figure 11 As shown, the gait recognition and early warning system 5 processes data through convolutional layers, pooling layers, and fully connected layers of a deep neural network, mapping foot data one-to-one with gait to achieve gait recognition. When abnormal gait, such as foot eversion or foot inversion, is detected, the system 5 will issue a reminder on the user's client. After the user's walking cycle ends, a gait recognition analysis is provided for the user's self-adjustment of gait correction. Based on the recorded plantar pressure data of the client's walking, a visualized gait recognition analysis is provided through a deep neural network algorithm, which can be used for the patient's self-gait correction.

[0044] When a person begins to walk, pressure and kinetic energy are generated on the soles of the feet. On one hand, the foot cushioning device 1, equipped with a spring of appropriate stiffness, absorbs the impact on the soles of the feet during walking, thereby dispersing the pressure and alleviating the pressure on the soles. On the other hand, the foot cushioning device 1 is also an energy harvesting device. By converting the kinetic energy of walking into electrical energy, the foot data acquisition and transmission system operates based on the energy collected by the foot cushioning device 1, transmitting gait frequency and pressure data to the gait recognition and early warning system 5. The gait recognition and early warning system 5 uses a deep neural network to recognize gait and warn of abnormal gait, enabling users to perceive and correct abnormal gait. Based on these two aspects, dynamic monitoring of self-powered foot pressure distribution is completed, ultimately achieving auxiliary treatment and prevention of plantar fasciitis.

[0045] Compared to traditional pressure monitoring insoles, which mostly monitor foot pressure when the body is stationary and standing, this new insole lacks data analysis on pressure during walking. Furthermore, the lack of feedback on foot pressure after wearing the insole prevents users from correcting incorrect posture, increasing the risk of abnormal foot pressure.

[0046] This device can meet more personalized needs and has a wider range of application prospects. Based on human dynamic parameters, it redistributes plantar pressure in a personalized manner, more effectively relieving plantar pressure. Furthermore, it utilizes human kinetic energy to achieve self-powering for the plantar data acquisition and transmission system. Through a gait recognition and early warning system, it provides alerts for abnormal gait on the client side, thereby enabling users to achieve self-prevention and diagnosis. In the future, patient-centered digital healthcare management will help doctors provide more personalized diagnoses and help patients gain a more intuitive understanding of their own health status, thus raising their health awareness. The application of wearable digital medical devices will reduce healthcare costs, free up medical resources, and offer a possibility for new clinical treatment models in the future.

[0047] The embodiments described above merely illustrate specific implementation methods of this application, and while the descriptions are detailed and specific, they should not be construed as limiting the scope of protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the technical solution of this application, and these modifications and improvements all fall within the scope of protection of this application.

Claims

1. A self-powered wearable system for dynamic monitoring of foot pressure distribution, characterized in that, include: The foot cushioning assist device (1) includes a linear-rotational motion conversion module, a gear speed-increasing transmission module, a compression spring (105) and a brushless motor (107), which converts the kinetic energy during walking into electrical energy; The smart insole (2) based on flexible piezoelectric sensing collects and records step frequency and plantar pressure data in real time; The energy storage and management module (3) stores and manages the energy collected by the foot cushioning device (1); The data transmission circuit module (4) works based on the electrical energy output by the energy storage and management module (3) and uploads the step frequency and pressure data collected by the smart insole (2) based on piezoelectricity and triboelectricity to the client's gait recognition and early warning system (5). The gait recognition and early warning system (5) displays the foot pressure distribution in real time and uses a deep neural network to complete gait recognition and provide timely terminal early warning for abnormal gait.

2. The self-powered wearable system for dynamic monitoring of foot pressure distribution according to claim 1, characterized in that, The linear-rotational motion conversion module converts kinetic energy into electrical energy of the brushless motor (107) through a gear speed-increasing transmission module and a compression spring (105). The linear-rotational motion conversion module includes a sleeve (103) and a ball screw transmission module (104). The sleeve (103) is sleeved on the outside of the nut (1041) of the ball screw transmission module (104). When the sleeve (103) is subjected to pressure, the sleeve (103) and the nut (1041) of the ball screw transmission module (104) rotate and move downward together, driving the screw (1043) of the ball screw transmission module (104) to rotate around its own central axis, thus converting linear motion into rotational motion.

3. The self-powered wearable system for dynamic monitoring of foot pressure distribution according to claim 2, characterized in that, The ball screw transmission module (104) also includes a ball (1042); a compression spring (105) is provided between the lower surface of the nut (1041) and the drive gear (1061) of the gear speed transmission module, and the screw (1043) passes through the center hole of the compression spring (105) and restricts the radial movement of the compression spring (105); when the sleeve (103) moves downward or upward together with the nut (1041) in the ball screw transmission module (104), the compression spring (105) is axially compressed or restored.

4. The self-powered wearable system for dynamic monitoring of foot pressure distribution according to claim 3, characterized in that, The D-shaped shaft end of the lead screw (1043) is interference-fitted with the D-shaped center hole of the drive gear (1061), so that the lead screw (1043) and the drive gear (1061) in the ball screw transmission module (104) rotate synchronously.

5. The self-powered wearable system for dynamic monitoring of foot pressure distribution according to claim 4, characterized in that, The teeth of the drive gear (1061) mesh with the lower gear teeth of the secondary gear (1062), driving the secondary gear (1062) to rotate; the upper gear teeth of the secondary gear (1062) mesh with the upper gear teeth of the tertiary gear (1063), driving the tertiary gear (1063) to rotate; the upper gear teeth of the tertiary gear (1063) mesh with the upper gear teeth of the quaternary gear (1064), driving the quaternary gear (1064) to rotate; the upper gear teeth of the quaternary gear (1064) mesh with the upper gear teeth of the quaternary gear (1065), driving the tertiary gear (1065) to rotate; the quintuplet gear (1065) is connected to the input shaft of the brushless motor (107) via a transmission.

6. The self-powered wearable system for dynamic monitoring of foot pressure distribution according to claim 5, characterized in that, The drive gear (1061), secondary gear (1062), tertiary gear (1063), and quaternary gear (1064) are respectively clearance-fitted with the stepped shaft (1066). The stepped shaft (1066) restricts the radial movement of the gears while retaining the rotational movement of the gears. The axial movement of the drive gear (1061), secondary gear (1062), tertiary gear (1063), and quaternary gear (1064) is respectively restricted by the shoulder of the stepped shaft (1066) and the shaft end retaining ring (1067) in the upper groove of the stepped shaft (1066).

7. A self-powered wearable system for dynamic monitoring of foot pressure distribution according to claim 6, characterized in that, The outer frame of the foot cushioning auxiliary device (1) includes a shell (101), an end cap (102) and a base plate (108). The shell (101) and the end cap (102) are both made of soft material and covered with a silicone layer. The hole on the base plate (108) is fitted with the stepped shaft (1066) to restrict the radial movement of the stepped shaft (1066). The shoulder of the stepped shaft (1066) and the shaft end retaining ring (1067) in the lower groove of the stepped shaft (1066) restrict the axial movement of the stepped shaft (1066).

8. The self-powered wearable system for dynamic monitoring of foot pressure distribution according to claim 7, characterized in that, The brushless motor (107) includes a motor housing (1071), a motor coil (1072), and a motor magnet (1073). The center hole of the five-stage gear (1065) is interference-fitted with the brushless generator (107) to achieve synchronous rotation of the five-stage gear (1065) and the input shaft of the brushless generator (107), thereby enabling the brushless generator (107) to start generating electricity. When the input shaft of the brushless motor (107) starts to rotate, the input shaft drives the brushless motor coil (1072) to rotate synchronously. The brushless motor housing (1072) and the brushless motor magnet (1073) serve as the stator, and the brushless motor coil (1072) serves as the rotor, rotating relative to the stator to generate electricity, thus completing the conversion of kinetic energy into electrical energy.

9. A self-powered wearable system for dynamic monitoring of foot pressure distribution according to claim 1, characterized in that, The smart insole (2) includes a mesh BK fabric layer (201), a flexible piezoelectric sensing layer (202), and an EVA layer (203). The flexible piezoelectric sensing layer (202) works based on the principle of piezoelectric effect. The main material of the flexible piezoelectric sensing layer (202) is a piezoelectric material. When the piezoelectric material is polarized under load, positive and negative charges are separated, causing the upper and lower surfaces of the piezoelectric material to generate charges of opposite polarity and equal magnitude, forming a potential difference, thereby recording the pressure value.

10. A self-powered wearable system for dynamic monitoring of foot pressure distribution according to claim 1, characterized in that, The gait recognition and early warning system (5) processes the data through the convolutional layer, pooling layer and fully connected layer of the deep neural network, and maps the foot data to the gait one by one, thereby realizing the recognition of gait; when an abnormal gait is detected, the gait recognition and early warning system (5) will remind the user's client.

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