Abstract: The research aims to design a practical, portable and wide-ranging deafness and tinnitus rehabilitation instrument, which increases the intensity of the single-chip control treatment to help patients recover their hearing and regain their health. According to the electrical impedance specificity of the acupoint, a threshold circuit with adjustable threshold is designed; the waveform generator is designed to generate a waveform to drive the sound of the earphone, and the pure tone excitation source with continuous frequency and decibel frequency is realized, and the liquid crystal displays and records the patient hearing threshold in real time; Noise treatment, through the triode base-collector Zener breakdown to produce white noise, the intensity can be adjusted; design the biological pulse generation circuit, after the voltage boosting circuit boost, the instantaneous discharge will have a similar acupuncture feeling, acting on the human body acupoints Treatment; liquid crystal display treatment intensity, button control circuit output intensity. After a large number of experiments, the results show that the accuracy of the probe is as high as 95%; the pure tone source frequency and decibel meet the requirements of hearing threshold detection, the frequency is 20 Hz~20 kHz, the decibel is 0~90 dB; the biological pulse stimulation intensity does not exceed the human body. Safe current, safe voltage. The deafness and tinnitus rehabilitation instrument studied in this project is simple, practical and portable. It conforms to the development trend of contemporary deafness and tinnitus rehabilitation instrument, and provides a good help for further effective rehabilitation of patients with deafness and tinnitus. 0 Preface With the increase of living pressure and the increase of environmental pollution, the number of deaf and tinnitus patients has shown an upward trend [1]. Deafness and tinnitus greatly affects daily life, which will further lead to psychological problems for patients and cause great pressure on society. According to the electrical impedance characteristics of human acupuncture points, this paper designed a deafness and tinnitus rehabilitation instrument based on single chip microcomputer, ICL8038 and 555 chips. The system design includes acupoint detection, hearing loss degree test, white noise treatment, biological pulse therapy, display circuit and peripheral circuit of single chip microcomputer. The modules of the system do not affect each other, which ensures the feasibility and effectiveness of the system. 1 system design Acupoints have susceptibility, effectivity and specificity. Through different stimulation methods of acupoints and stimulation amount, treatment of some diseases can be achieved [2]. Acupoints are usually where nerve endings and blood vessels are less, with unique low-resistance, high-capacitance characteristics [3]. White noise refers to noise whose power spectral density is evenly distributed throughout the frequency domain. Random noise with the same energy density at all frequencies is called white noise. Pulse has a variety of therapeutic effects on the human body. Through stimulation, it can promote blood vessel expansion, accelerate blood flow, and enable cells to get sufficient nutrients and improve the symptoms of deafness and tinnitus [4]. The overall structure of the system is shown in Figure 1. The project passes through the exploration circuit. When the acupuncture points are found, the buzzer sounds and the diode emits light, and the acupuncture points are marked. Through the hearing loss degree test, white noise and biological pulse corresponding to the stimulation level are given at the marked acupoint point for treatment. The treatment circuit feeds back to the single-chip microcomputer to control the degree of stimulation of the liquid crystal display. 2 hardware design 2.1 Acupoint recognition The 555 timer is an integrated device that combines analog and digital functions for reliable performance and flexible use [5]. The probe circuit is shown in Figure 2, including the detection circuit on the left and the trigger display circuit on the right. When the probe moves close to or touches the acupuncture point, the acupoint has a low resistance characteristic, the transistor Q1 is turned on, the RS flip-flop is set to 1, the 3 pin outputs a high level, the Q2 is turned on, the LED emits light, and the buzzer emits a sound. , indicating that the acupuncture points were found. At the non-acupoints, the buzzer does not make a sound. 2.2 Judgment of hearing loss Figure 3 is a waveform generation circuit diagram. A precision waveform generator is fabricated by using ICL8038. R1 and R2 are equal, so that the rectangular wave duty ratio is 50%. In actual operation, since the access resistance is not accurate, a potentiometer needs to be added. R3, adjust both sides to make them equal. 10 pins are connected to three capacitors with different resistance values. The switch controls the required access. Different capacitors can reduce the distortion at low frequency and high frequency, and the waveform output is more stable. The output waveform is connected to the amplifying circuit for amplification, and the sound source is driven to emit sounds of different loudness. The waveform is input to the single-chip microcomputer, and the decibel and frequency are displayed in real time through the single-chip microcomputer, A/D conversion, timer liquid crystal display, etc., and the degree of hearing loss is discriminated. Tetanus Vaccine,Hepatitis B Vaccine For Adults,Tetanus Booster,Td Vaccine FOSHAN PHARMA CO., LTD. , https://www.fospharma.com
Research deafness, tinnitus rehabilitation instrument based on MCU
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