The development and design of the control panel of the magnetothermal physiotherapy instrument

The aging population is serious, and diseases such as bone and joint diseases and soft tissue injuries directly affect the quality of life of the elderly. In my country, more than 100 million people suffer from bone and joint diseases, and more than 50% of the elderly over 60 suffer from different degrees of bone and joint diseases. At the same time, in the clinical treatment of soft tissue injuries, a relatively high proportion of patients with chronic and intractable neck, shoulder, waist, and leg pain are generally ineffective in conventional drug treatment. In recent years, many new technologies and methods have emerged in clinical practice, and a variety of physical therapy instruments have emerged for the treatment of corresponding diseases such as osteoarthritis, soft tissue sprains and lumbar muscle strains. In particular, some therapeutic instruments that integrate various physical therapy factors have received widespread attention from medical workers, such as magnetic vibration thermal therapeutic instruments and ultrashort wave therapeutic instruments. The magnetic vibration heat therapy instrument is a comprehensive therapeutic instrument that combines magnetic therapy, thermotherapy and micro-vibration therapy. It incorporates the principles of magnetic therapy and modern acupuncture, and can create a stable electromagnetic environment that is in line with the human body, and treat diseases with the help of three physical factors: magnetism, vibration, and heat.

The research on magnetic vibration thermal physiotherapy equipment is earlier in foreign countries. At the end of the 19th century, Japan invented the HM-2SC-A thermomagnetic vibration therapeutic instrument. The magnetic field range of the therapeutic instrument is 0~38mT, the temperature can be adjusted in 4 levels of 40°C, 50°C, 60°C, and 65°C, and the vibration frequency is 50~ 120Hz, initially realized the application of magnetic vibration thermal physiotherapy instrument in clinical practice. In 2008, Japan's Ito developed a magnetic vibration thermal physiotherapy instrument, which has the functions of a constant magnetic field range of 0~40mT, 4 grades of temperature optional, 3 vibration modes optional, and multi-channel use, realizing the magnetic vibration thermal physiotherapy instrument Go home. In our country, since the vibration and heat therapy functions are accompanied by the treatment mode, the three technical parameters of the magnetic field strength, vibration massage intensity, and heat therapy function of the magnetic vibration thermal physiotherapy instrument cannot be individually adjusted to a certain value, and the application range is narrow and the treatment efficiency is high. relatively low. At present, the magnetic vibration thermal physiotherapy instruments on the market have relatively single treatment temperature and magnetic field parameters, which are not conducive to the use of patients with poor skin heat resistance and high demand for magnetic field environments. Moreover, the warm-up is slow, and the actual treatment time is short, which affects the curative effect. Aiming at the above defects, this study designs a magnetic vibration thermal physiotherapy instrument with fast warm-up, simple structure, adjustable treatment temperature, optional 4-level magnetic field strength, and two modes of continuous and intermittent vibration massage.

1. Function and performance index of physiotherapy instrument

The magnetic vibrating thermal physiotherapy instrument in this study has functions including multi-level magnetic field range, adjustable treatment time and temperature, and two vibration modes, providing patients with more options for treatment parameters and maximizing the curative effect. Its performance indicators are as follows: (1) In order to meet the requirements of different patients for the treatment magnetic field, it provides 4 levels of magnetic field strength that can be independently selected, the first level is 0~60mT, the second level is 60~120mT, the third level is 120~150mT, the fourth level is The range is 150mT and above; (2) In order to meet the treatment time requirements of different patients, the treatment time can be preset from 1 to 99 minutes; (3) In order to meet the treatment temperature requirements of different patients and ensure the safety of treatment, the treatment temperature is 30°C~ 45°C can be preset; (4) In order to meet the needs of different patients’ vibration massage methods, two vibration massage methods, continuous vibration and intermittent vibration, are provided, with a vibration frequency of 50Hz; (5) Power supply: AC (6±5) V, frequency 50Hz.

2. Overall Design of Magnetic Vibration Thermal Therapy Apparatus

The magneto-thermal physiotherapy instrument is mainly composed of two parts: a magneto-caloric vibrator and a control system. The magneto-caloric vibrator mainly acts on the patient's skin to provide three physical therapy factors: magnetism, vibration and heat. The control system can accurately control the treatment temperature of the magneto-caloric vibrator. and treatment time, realize real-time monitoring of treatment temperature, set treatment time and ensure safety and stability during treatment.

3. Design of magnetothermal vibrator for physiotherapy instrument

The actual magnetocaloric vibrator is shown in Figure 2. The magnetocaloric vibrator is mainly composed of a fixing device, a magnet and a coil with a core. There are multiple grooves distributed in parallel on the fixing device, magnets are fixedly installed in the grooves at both ends, and core-containing coils and resonant magnetic strips arranged in parallel are installed in the remaining grooves. Adjacent strips have opposite polarities, creating a constant magnetic field. When 50Hz alternating current is applied, the core-containing coil in the magnetocaloric vibrator generates an alternating magnetic field, which is vibrated by the constant magnetic field generated by the magnetic strip, and the resonant magnetic strip around the core-containing coil then resonates. At the same time, the iron core in the coil is in the alternating magnetic field, and the alternating magnetic flux makes it generate induced current, and the eddy current effect of the current generates heat. Therefore, three physical factors of magnetism, vibration and heat can be obtained through the magnetocaloric vibrator.

In order to provide a safe and reliable treatment environment, the fixing device is made of high-temperature-resistant materials to avoid deformation, melting, and adhesion to the coil caused by the heating of the core-containing coil when the power is applied; at the same time, the core-containing coil and the resonant magnet will continue to Vibration will cause high-frequency collision with the fixing device, which will easily deform the device and reduce the usability. Therefore, the selected material needs to have certain strength and wear resistance. In order to realize the rapid preheating of the magnetocaloric vibrator and ensure the treatment time of patients, silicon steel material with good magnetic conductivity, large internal resistance and low loss is used as the coil core, which can heat up quickly, reduce eddy current, and improve the controllability of temperature. sex.

4.The realization of the physical therapy instrument control system

The main functions of the control system include controlling the treatment temperature range and treatment time, displaying the current temperature in real time, and keeping the temperature stable through feedback control to ensure the safe and reliable operation of the magnetocaloric vibrator. When the parameters such as the treatment time and the upper and lower limits of the treatment temperature are set, the magnetocaloric vibrator starts to work, and the temperature sensor collects the temperature data, which is processed and displayed by the C52 single-chip microcomputer. When the treatment time is not over, when the treatment temperature is greater than the set upper limit, the relay will be disconnected to stop heating, otherwise, the relay will be closed to start heating, and the treatment temperature will enter the heat preservation state between the upper limit and the lower limit; when the treatment time is over, the bee The buzzer sounds and the relay is cut off, and the work of the magnetocaloric vibrator ends.

4.1 Design of treatment temperature acquisition device

The actual treatment temperature of the Magnetic Vibration Thermal Therapy Apparatus is set at 30°C~45°C. The temperature acquisition device adopts the DS18B20 temperature sensor produced by DALLAS Company of the United States for temperature data acquisition. When working, the temperature sensor DS18B20 probe is fixedly installed next to the magnetocaloric vibrator, and the analog signal of temperature change is converted into a digital signal by the A/D conversion module and transmitted to the single-chip microcomputer, and then the digital signal is combined with the program algorithm inside the single-chip processing unit. The temperature value is associated, and finally the temperature value that can be displayed is obtained. Through the real-time monitoring of the treatment temperature, patients can be provided with safer, stable and precise temperature selection, and the control of the temperature range during treatment can be realized.

4.2 Timing function design

In this paper, the high-performance, low-power real-time clock chip DS1302 produced by DALLAS Company of the United States is used to realize timing. The Magnetic Vibration Thermal Physiotherapy Apparatus can provide patients with a choice of different treatment times. According to the degree of disease and the degree of skin sensitivity of patients, the corresponding treatment time can be selected. The timing function can be set from 1 to 99 minutes. When the set time is reached, the system will automatically cut off the working power of the magnetothermal vibrator and stop the treatment.

4.3 Display interface design

This article uses DS1602 to display the treatment time and treatment temperature. The display interface mainly includes a working interface and a parameter setting interface. Figure 3 is the control circuit and its physical diagram. At this time, it is the working interface. Time is the treatment time, displaying hours, minutes and seconds; Temperature is the real-time tracking display of the treatment temperature of the magnetothermal vibrator. The setting interface includes four parameter values: Up, Down, Z, and Q. Among them, Up is the upper limit value of the treatment temperature, and Down is the lower limit value of the treatment temperature. When the temperature value obtained by the temperature sensor is lower than the lower limit value of Down, the magnetocaloric vibrator continues to heat; when the temperature value reaches the upper limit value of Up, the magnetothermal vibrator The vibrator stops heating; when the temperature value is between Up and Down, the magnetocaloric vibrator is in a stable heat preservation state. Q is the start value of treatment time, Z is the end value of treatment time, which can be set according to the needs of patients.

4.4 Key control design

The Magnetic Vibration Thermal Physiotherapy Apparatus in this article has 5 main function buttons, numbered 1~5. Button 1 is the button for switching the interface and selecting the setting position. Press the first button to enter the Up value setting position of the setting interface, press it again to enter the Down value setting position, and then enter the hour position and minute position of the treatment time end value in turn, and finally Return to the working interface, and repeat like this to realize the selection of the set value position; button 2 and button 3 are plus and minus buttons, when button 1 selects the set position, the function of addition and subtraction is realized, if button 1 is not selected, button 2 The function of button 3 is locked; button 4 is the execution button, when the treatment time and treatment temperature are set, click button 4 to return to the working interface and execute; button 5 is the vibration massage mode selection button, when selected, a The 8V AC voltage source switches the working state of the relay according to the temperature change to realize intermittent vibration and keep the temperature stable. When it is not selected, different AC voltage sources are selected according to the patient's treatment temperature requirements to achieve continuous vibration.

5.Physiotherapy instrument treatment temperature function test

The magnetic thermal physiotherapy instrument is a treatment that is in contact with the human body. The magnetic thermal vibrator is an important component, and the magnetic thermal temperature is an important parameter of the magnetic thermal physiotherapy. Greenhalgh et al. found that when the human skin is exposed to a heat source at 44°C for 8 hours, it can cause mild burns, such as skin being reddened and blisters. Herndon believes that when the temperature reaches 44°C or higher, the accumulated damage exceeds the ability of the cells to repair themselves, and when enough time is reached, it may eventually lead to tissue necrosis. Moritz et al. found through research that when contacted with a heat source at a temperature of 49 °C for 3 minutes, only local erythema occurs without obvious epidermal damage, while contact with the same temperature for 9 minutes may lead to obvious skin necrosis. This puts high demands on the temperature control of the magnetothermal physiotherapy apparatus and the heat generation mechanism of the magnetocaloric vibrator, so it is necessary to test whether the temperature generated by the magnetocaloric vibrator reaches the set effective treatment temperature.

Fix the DS18B20 contact temperature sensor probe and place it next to the magnetocaloric vibrator coil, and the DS1602 will display the measured treatment temperature data in real time. Each measurement time is 100min, the ambient temperature is 22°C, and the working power supply voltage is 1.6V AC. After 15 experimental measurements, the results show that when the magnetocaloric vibrator coil is powered on, the temperature rises for about 5min at the beginning and reaches a stable value. status until the end of the experiment. The collected data was fitted to the curve by MATLAB, and the treatment temperature curve when the magnetocaloric vibrator was working was obtained, as shown in Figure 4. It can be seen that the magnetocaloric vibrator can achieve rapid warm-up and provide a stable treatment temperature during operation. According to the eddy current effect, it can be known that the thermal energy of the iron core in the coil is related to the AC voltage value in the coil, so changing the thermal energy generated by the magnetocaloric vibrator can be realized by changing the AC voltage at both ends of the coil.

Summarize

Magnetic vibration thermal physiotherapy instrument is a reliable method in the field of physical rehabilitation, which can effectively help patients eliminate pain and recover quickly. At present, it has been more and more used in the auxiliary treatment of chronic soft tissue injuries and neck, shoulder, waist and leg pain. Indications include soft tissue contusion, lumbar muscle strain, chronic bronchitis, sciatica, various joint inflammations, and postoperative wound healing relief.

Most of the existing magnetic vibratory thermal physiotherapy instruments have a single selection of parameters such as magnetic field, temperature, vibration, etc., with low application range and slow warm-up. The magnetic vibration thermal physiotherapy device designed in this paper adopts multiple modules of magnetic thermal vibrators, and provides more magnetic field parameter options according to the surface magnetic properties of different magnet materials. Generating different therapeutic magnetic field environments helps to maximize the therapeutic effect of magnetic therapy in the Magnetic Vibration Thermal Therapy Apparatus. The silicon steel material is selected to be placed in the coil, because the internal resistance of the silicon steel material is large, and rapid preheating can be achieved. Independent temperature adjustment and real-time monitoring can avoid burns or scalds caused by different skin tolerance of different patients, which can better meet the needs of patients. Provide two vibration modes of continuous vibration and intermittent vibration to avoid the discomfort caused by long-term continuous vibration therapy for some patients and affect the treatment effect. The multi-parameters of the Magnetic Vibration Thermal Physiotherapy Apparatus can be adjusted, but the wearing method of this product still needs further development and research.

The above is an example of the design and development of the magnetic vibration thermal physiotherapy instrument introduced by Shenzhen Zuchuang Microelectronics Co., Ltd. If you have a need for the development of a physiotherapy device program, you can rest assured to entrust it to us. We represent a variety of single-chip microcomputers, voice chips, dual-mode Bluetooth ICs, and wifi chips. Brands include Songhan MCU, Yingguang MCU, Jerry Bluetooth, Ankai Bluetooth, Allwinner, and Realtek. Our technical services include: PCB design, microcontroller development, Bluetooth solutions, software and hardware custom development, APP development, small program development, WeChat official account development, etc. It can also undertake the design of intelligent electronic products, the development of living appliances, the research and development of beauty equipment, the application of Internet of things platform, the smart home control system, the development of TWS earphones, Bluetooth earphone speakers, the development of children's educational toys, the design of electronic education products, etc.