Foot bottom force acquisition and feedback device

Abstract

The utility model discloses a plantar force collecting and feedback device which comprises a microprocessor, a data communication module, an external data storage device, a plantar supporting gasket matched with the outline of the sole of a human body and a plurality of data collecting parts arranged on the plantar supporting gasket, and the output ends of the data collecting parts are connected with the microprocessor. The microprocessor is in communication connection with the data communication module, and the data acquisition part comprises an A / D converter, a signal conditioning circuit, pressure sensors arranged on a plurality of acquisition points on a sole supporting gasket and attitude sensors arranged at the front end and the rear end of the sole supporting gasket. And the external data memory and the attitude sensor are connected with the microprocessor. According to the utility model, human body plantar pressure data can be acquired by collecting human body plantar pressure changes, the motion state of a human body and the change condition of the human body plantar pressure can be accurately reflected, and a scientific basis is provided for early warning and judgment of human body foot diseases and health conditions.

Description

Technical Field

[0001] The utility model belongs to medical rehabilitation detection technology, in particular to a plantar force detection device, specifically to a plantar force collection and feedback device. Background Art

[0002] People walk every day, and many jobs even require standing for long periods of time. For people with weak lower limb function, reducing the physical exertion of walking and standing and improving the exercise efficiency of the lower limbs are of great significance. For people who stand for a long time and those with lower limb diseases, a lack of attention and understanding of plantar pressure will lead to an increase in the incidence of foot diseases and aggravation of the disease. Therefore, with the continuous improvement of science and technology and living standards, people's desire for physical exercise and health maintenance is increasing day by day. It is necessary to understand the changes in plantar force distribution from the changes in plantar pressure. When the foot suffers from certain diseases, the plantar pressure will be destroyed immediately. Many diseases, such as arthritis and diabetes, can be judged by testing plantar pressure. At the same time, flat feet and other conditions can also be detected through plantar pressure distribution. Therefore, analyzing the health status of the feet through plantar force and posture detection and issuing early warnings is of great significance for reducing the physical exertion of walking and standing and improving the exercise efficiency of the lower limbs. However, in the actual plantar force collection process, the data collection is usually more complicated due to the influence of the free walking posture of the collector, and it is difficult to achieve real-time collection and feedback of the plantar pressure when the person walks, which further affects the analysis of the health status of the feet, resulting in the influence of walking posture on the judgment of the person's health status, which will make the accuracy of the plantar pressure points lower, thereby affecting data collection. Utility Model Content

[0003] The purpose of this utility model is to provide a plantar force collection and feedback device. This device can collect and obtain plantar pressure data by measuring changes in plantar pressure on the human body. This device can accurately reflect the body's movement state and the changes in plantar pressure on the human body, providing a scientific basis for early warning and judgment of foot diseases and health conditions. To achieve the above purpose, the following technical solutions are adopted:

[0004] According to one aspect of the utility model, the utility model provides a plantar force collection and feedback device, which includes a microprocessor, a data communication module, an external data storage device, a plantar support pad adapted to the contour of the human foot, and multiple data collection parts arranged on the plantar support pad. The output end of the data collection part is connected to the microprocessor, and the microprocessor is communicatively connected to the data communication module. The data collection part includes an A / D converter, a signal conditioning circuit, pressure sensors arranged at multiple collection points on the plantar support pad, and a posture sensor arranged at the front and rear ends of the plantar support pad. The output end of the pressure sensor is connected to the input end of the microprocessor through a signal amplifier and an A / D converter, and the external data storage device and the posture sensor are connected to the microprocessor.

[0005] The above scheme is further preferred, in which the plantar support pad includes a protective surface layer, a bottom force piezoelectric film layer, a bottom force conductive layer and a pressure-bearing support layer adhered to each other from top to bottom, and pressure sensors corresponding to the calcaneus, phalanges and metatarsals on the sole of the human foot are respectively arranged on the bottom force piezoelectric film layer, and the posture sensors are respectively arranged on the front and rear ends of the bottom force conductive layer.

[0006] The above solution is further preferred in that the protective surface layer is provided with a receiving hole corresponding to the pressure sensor on the piezoelectric film layer, and the receiving hole is provided with an elastic coating sheet protruding in an arc shape along the surface of the piezoelectric film layer.

[0007] The above solution is further preferred in that a downwardly recessed wiring support plate corresponding to the pressure sensor is distributed on the bottom force conductive layer, and the pressure sensor is electrically connected to the microprocessor through the wiring support plate and the data wires distributed on the bottom force conductive layer.

[0008] The above scheme is further preferred, and a snap button female seat is arranged along the edge of the pressure-bearing support layer, and plug holes that are mutually connected and correspond to the snap button female seat are respectively arranged along the edge of the protective surface layer, the edge of the bottom force piezoelectric film layer and the edge of the bottom force conductive layer. The edge of the protective surface layer, the edge of the bottom force piezoelectric film layer, the edge of the bottom force conductive layer and the edge of the pressure-bearing support layer are connected by inserting the snap button male body into the snap button female seat through the plug hole.

[0009] The above solution is further preferred, wherein the signal conditioning circuit includes a signal amplifying circuit and a signal filtering circuit, and the acquisition output end of the pressure sensor is connected to the input end of the A / D converter through the signal amplifying circuit and the signal filtering circuit.

[0010] The above scheme is further preferred, wherein the signal amplification circuit includes an operational amplifier U1 and a resistor R1, the signal filtering circuit includes a resistor R2 and a capacitor C1, the acquisition output end of the pressure sensor is respectively connected to one end of the resistor R1 and the positive input end of the operational amplifier U1, the output end of the operational amplifier U1 is respectively connected to the reverse input end of the operational amplifier U1 and one end of the resistor R2, the other end of the resistor R2 is respectively connected to one end of the capacitor C1 and the input end of the A / D converter, and the other end of the capacitor C1 and the other end of the resistor R1 are respectively connected to the ground.

[0011] In summary, the present invention adopts the above technical solution, and the present invention has the following technical effects:

[0012] (1) Compared with conventional force measuring devices, the sole force collection and feedback device of the utility model has greater flexibility. The sole support pad force device can be placed directly in the shoe, and then the microprocessor force measuring device can be placed on the ankle for rapid detection;

[0013] (2) The plantar force collection and feedback device of the present invention comprehensively considers the wearing comfort of the sole of the foot and the stability of each component, so that it conforms to the walking and sole structure, and can quickly understand the plantar pressure distribution and posture change feedback data for analysis. By collecting the plantar pressure changes of the human body, the plantar pressure data of the human body is obtained, and the movement state of the human body and the changes in the plantar pressure of the human body are accurately reflected, and the health status of the foot is analyzed, so as to make early judgments and warnings on foot diseases. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of a plantar force collection and feedback device of the present utility model;

[0015] Figure 2 It is a structural diagram of the signal conditioning circuit of the utility model;

[0016] Figure 3 This is a schematic diagram of the distribution of sensors on the plantar support pad of the present invention;

[0017] Figure 4 This is a structural diagram of the plantar support pad of the present invention;

[0018] In the accompanying drawings, there are microprocessor 1, data communication module 2, external data storage 3, plantar support pad 4, pressure sensor 5, posture sensor 6, protective surface layer 41, bottom force piezoelectric film layer 42, bottom force conductive layer 43, pressure support layer 44, snap female seat 45, plug hole 46, snap male body 47, receiving hole 410, elastic coating sheet 411, and wiring support plate 430. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many of the details listed in this specification are merely provided to help readers gain a thorough understanding of one or more aspects of the present invention, and these aspects of the present invention can be implemented even without these specific details.

[0020] Combine Figure 1 According to a plantar force collection and feedback device of the present invention, the plantar force collection and feedback device includes a microprocessor 1, a data communication module 2, an external data storage 3, a plantar support pad 4 adapted to the contour of the human foot, and multiple data collection parts arranged on the plantar support pad 4, the output end of the data collection part is connected to the microprocessor 1, the microprocessor 1 is communicatively connected to the data communication module, the data collection part includes an A / D converter, a signal conditioning circuit, a pressure sensor 5 arranged at multiple collection points on the plantar support pad, and a posture sensor 6 arranged at the front and rear ends of the plantar support pad, the output end of the pressure sensor 5 is connected to the input end of the microprocessor 1 through a signal amplifier and an A / D converter, the external data storage 4 and the posture sensor 6 are connected to the microprocessor 1; the microprocessor 1 processes and analyzes the plantar force data collected by the pressure sensor 5 and the plantar posture collected by the posture sensor 5, and the obtained pressure data and posture data are uploaded to the host computer through the data communication module for analysis and data icon drawing and other functions, and the host computer is a PC computer terminal or tablet for receiving data Tablet computer, mobile phone terminal, through the Labview installed in the host computer, the collected data is converted into a chart in real time and displayed, the data communication module is a Bluetooth communication module or a WIFI communication module or a ZigBee communication module, the plantar force data collected by the pressure sensor 5 and the plantar posture data collected by the posture sensor 5 are uploaded to the host computer in real time, the external data storage 3 is used to store the posture data and pressure data detected by the posture sensor 6 and the pressure sensor 5 respectively, the external data storage 3 adopts a U disk, an SD card, an MMC card or an SM card to realize real-time storage of the collected data, the plantar support pad 4 is a shoe insole for installing the pressure sensor and the posture sensor, and is used to collect plantar force and posture data; in the utility model, the microprocessor 1 adopts the STM32F103C8T6 single-chip microcomputer, the pressure sensor 5 adopts the FSR thin film sensor, the resistance value of the FSR thin film sensor decreases as the pressure on the sensing area increases, and the linear AD conversion signal is output by using the A / D converter, so the measurement accuracy is high, the FSR thin film sensor is an FSR400 model thin film pressure sensor, which can output a 0-0.3V voltage signal;

[0021] like Figure 2As shown, the signal conditioning circuit includes a signal amplifying circuit and a signal filtering circuit. The acquisition output end of the pressure sensor 5 is connected to the input end of the A / D converter through the signal amplifying circuit and the signal filtering circuit. The signal amplifying circuit includes an operational amplifier U1 and a resistor R1. The signal filtering circuit includes a resistor R2 and a capacitor C1. The acquisition output end of the pressure sensor 5 is respectively connected to one end of the resistor R1 and the positive input end of the operational amplifier U1. The output end of the operational amplifier U1 is respectively connected to the reverse input end of the operational amplifier U1 and one end of the resistor R2. The other end of the resistor R2 is respectively connected to one end of the capacitor C1 and the A / D converter. The input end of the A / D converter is connected to the data input end of the microprocessor 1, the other end of the capacitor C1 and the other end of the resistor R1 are connected to the ground respectively, the plantar force data collected by the pressure sensor 5 is amplified by the operational amplifier U1 to form an AC analog electrical signal and output to the A / D converter, the filter circuit composed of the resistor R2 and the capacitor C1 filters the plantar force data amplified by the operational amplifier U1 to remove interference data; the A / D converter sends the amplified plantar force analog signal to the microprocessor 1 for analysis and calculation to obtain the pressure value of the plantar; the posture sensor 6 sends the measured posture data to the microprocessor 1.

[0022] In this utility model, if Figure 3 As shown, the plantar support pad 4 is placed in the shoe, and the subject wears the shoe and walks. When the pressure on the pressure sensor 5 changes, the plantar force change parameter is collected; when the foot is displaced, the posture sensor 6 measures the foot in the forward direction, the direction perpendicular to the ground, and the posture inclined to the ground to obtain different plantar force parameters; the posture sensor 6 changes in the vertical direction (Z axis) and the corresponding change in the speed of the foot in the vertical direction (Z axis). When the foot gradually steps on the ground, the foot speed first increases in the positive direction and then decreases to zero. When the foot is flat on the ground, the foot speed increases in the positive direction and then decreases to zero. The speed and acceleration are both zero; when the foot is gradually lifted, the speed increases in the opposite direction first and then decreases, the vertical direction (Z axis) acceleration is first the minimum, and then the acceleration is the maximum. When the acceleration of the foot posture changes to the maximum and minimum, the plantar force parameters are obtained in real time through the pressure sensor 5, and the pressure parameters of each point on the plantar are tested and analyzed and the pressure parameters are corrected in combination with the changes in posture, so as to obtain the plantar force parameters of the human body or the plantar in different postures, and then make corrections in combination with the changes in the piezoelectric constant caused by the posture change, which greatly improves the accuracy of the pressure measured by the sensor. In the present utility model, combined with Figure 3 and Figure 4, is a schematic diagram of the distribution of pressure sensors on the plantar support pad 4; the plantar support pad 4 includes a protective surface layer 41, a bottom force piezoelectric film layer 42, a bottom force conductive layer 43, and a pressure support layer 44 adhered to each other from top to bottom. Pressure sensors 5 corresponding to the calcaneus, phalanges, and metatarsals on the sole of the human foot are respectively disposed on the bottom force piezoelectric film layer 42, and the posture sensors 6 are respectively disposed on the front and rear ends of the bottom force conductive layer 43. The plantar pressure distribution of each person is different and is also affected by the environment and genes. Therefore, the insole design of the plantar pressure collection system needs to be combined with the characteristics of the human plantar and different environmental settings. However, if the design is based on the above conditions, it will become very complicated, and different insoles will need to be replaced for different scenarios. According to research and analysis of plantar pressure in normal adults, the forefoot and heel of the human foot bear more than 90% of the plantar pressure. Therefore, multiple pressure sensors need to be placed in the forefoot and heel as important areas for data collection. The calcaneus is the main bone that bears the weight of the human body. People need the support of the calcaneus to stand and push the body forward, so two pressure sensors are set on the inside and outside of the heel. The toes are at the front part of the foot. The toes and calcaneus bear the weight of the whole body. There are 5 toes in the human foot. During tiptoeing, the toes and toes need to bear pressure, so a pressure sensor is set at the first toe; the metatarsal bones are in the middle and front area of ​​the foot, and are also very important pressure-bearing bones of the human body. From the inside to the outside of the sole are the first, second, third, fourth and fifth metatarsal bones. The peak value after the third metatarsal bone is higher in the case of pathology, so a pressure sensor is set at the second and third metatarsal bones; the tarsal bones are in the middle and rear part of the sole, and play the role of connecting joints in the whole foot, so A pressure sensor node is set in the middle of the sole of the foot. Therefore, the metatarsal bones of the foot are subjected to the greatest pressure, followed by the toes and calcaneus. The tarsal bones are subjected to the least pressure. The pressure values ​​of other parts of the sole of the foot are not very obvious. As the human body performs different exercises, the pressure value of the sole of the foot will change. By setting a pressure sensor on the sole of the foot to measure and compare the pressure points of the sole of the foot, and setting the pressure sensor in the area with obvious pressure, effective sole pressure data can be collected, and the changes in sole pressure distribution can be analyzed. The utility model sets 6 sensors in the single-foot insole to detect the pressure points, which does not affect the wearing comfort.

[0023] In this utility model, combined with Figure 3 and Figure 4, a receiving hole 410 is provided on the protective surface layer 41 and passes through the pressure sensor 5 on the bottom force piezoelectric film layer 42, and an elastic coating sheet 411 is provided on the receiving hole 410, which is raised in an arc shape along the surface of the bottom force piezoelectric film layer 42, and the elastic coating sheet 411 is a silicone sheet; so that the pressure sensor 5 can be covered in the space around the receiving hole 410 by the elastic coating sheet 411 to protect the pressure sensor 5. The sensing area of ​​the pressure sensor 5 is in direct contact with the sole of the foot through the elastic coating sheet 411, which can not only collect accurate data, but also avoid direct contact between the pressure sensor 5 and the foot, resulting in detection errors; downwardly concave wiring support plates 430 corresponding to the pressure sensor 5 are distributed on the bottom force conductive layer 43, and the The pressure sensor 5 is electrically connected to the microprocessor 1 through the wiring support plate 430 and the data wires 431 distributed on the bottom force conductive layer 43; the middle part of the pressure sensor 5 is fixed on the bottom force piezoelectric film layer 42, and the upper and lower ends of the pressure sensor 5 are respectively accommodated in the space formed between the elastic coating sheet 411 and the wiring support plate 430. The output end of the pressure sensor 5 can transmit the collected data to the microprocessor 1 through the wiring support plate 430 and the data wire 431. The bottom force conductive layer 43 is separately provided to facilitate line connection, and is not exposed on the upper surface in contact with the sole of the foot. It can reduce damage to the line during walking, play a role in protecting the circuit, and is more comfortable to wear, avoiding the sensation of foreign body, and also preventing the pressure sensor 5 from moving during the detection process.

[0024] After this utility model, combined with Figure 3 and Figure 4 A snap female seat 45 is provided along the edge of the pressure-bearing support layer 44, and plug holes 46 that are mutually connected and corresponding to the snap female seat 45 are respectively provided along the edge of the protective surface layer 41, the edge of the bottom force piezoelectric film layer 42 and the edge of the bottom force conductive layer 43. The edge of the protective surface layer 41, the edge of the bottom force piezoelectric film layer 42, the edge of the bottom force conductive layer 43 and the edge of the pressure-bearing support layer 44 are connected by inserting the snap male body 47 into the snap female seat 45 through the plug hole 46, which improves the stability of the setting between the various layers of the plantar support gasket 4, avoids the falling off between the various layers of the plantar support gasket 4, and further improves the accuracy of data detection. Setting a pressure sensor on the plantar support gasket 4 (shoe insole) will not affect the comfort.

[0025] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A plantar force collection and feedback device, characterized by: The bottom force collection and feedback device includes a microprocessor, a data communication module, an external data storage device, a plantar support pad adapted to the contour of the human foot, and multiple data collection parts arranged on the plantar support pad. The output end of the data collection part is connected to the microprocessor, and the microprocessor is in communication with the data communication module. The data collection part includes an A / D converter, a signal conditioning circuit, pressure sensors arranged at multiple collection points on the plantar support pad, and posture sensors arranged at the front and rear ends of the plantar support pad. The output end of the pressure sensor is connected to the microprocessor through a signal amplifier and an A / D converter. The input end of the processor is connected, and the external data storage and posture sensor are connected to the microprocessor; the plantar support pad includes a protective surface layer, a bottom force piezoelectric film layer, a bottom force conductive layer and a pressure support layer adhered to each other from top to bottom, and pressure sensors corresponding to the calcaneus, phalanges and metatarsals on the sole of the human foot are respectively arranged on the bottom force piezoelectric film layer, and the posture sensors are respectively arranged on the front and rear ends of the bottom force conductive layer; the pressure sensor obtains plantar force parameters in real time, and the posture sensor is used to measure different plantar force parameters in various states when the foot is in the forward direction, perpendicular to the ground and inclined to the ground.

2. The plantar force collection and feedback device according to claim 1, characterized in that: The protective surface layer is provided with a receiving hole corresponding to the pressure sensor on the piezoelectric film layer, and the receiving hole is provided with an elastic coating sheet protruding in an arc shape along the surface of the piezoelectric film layer.

3. A plantar force collection and feedback device according to claim 1 or 2, characterized in that: A downwardly recessed wiring support plate corresponding to the pressure sensor is distributed on the bottom conductive layer. The pressure sensor is electrically connected to the microprocessor via the wiring support plate and data wires distributed on the bottom conductive layer.

4. The plantar force collection and feedback device according to claim 2, characterized in that: A snap female seat is arranged along the edge of the pressure-bearing support layer, and plug holes that are mutually connected and correspond to the snap female seat are respectively arranged along the edge of the protective surface layer, the edge of the bottom force piezoelectric film layer and the edge of the bottom force conductive layer. The edge of the protective surface layer, the edge of the bottom force piezoelectric film layer, the edge of the bottom force conductive layer and the edge of the pressure-bearing support layer are connected by inserting the snap male body into the snap female seat through the plug hole.

5. The plantar force collection and feedback device according to claim 1, characterized in that: The signal conditioning circuit includes a signal amplifying circuit and a signal filtering circuit. The acquisition output end of the pressure sensor is connected to the input end of the A / D converter through the signal amplifying circuit and the signal filtering circuit.

6. The plantar force collection and feedback device according to claim 5, characterized in that: The signal amplification circuit includes an operational amplifier U1 and a resistor R1, and the signal filtering circuit includes a resistor R2 and a capacitor C1. The acquisition output end of the pressure sensor is respectively connected to one end of the resistor R1 and the positive input end of the operational amplifier U1, and the output end of the operational amplifier U1 is respectively connected to the reverse input end of the operational amplifier U1 and one end of the resistor R2. The other end of the resistor R2 is respectively connected to one end of the capacitor C1 and the input end of the A / D converter, and the other end of the capacitor C1 and the other end of the resistor R1 are respectively connected to the ground.

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