Constant-current output intermediate frequency therapeutic instrument system
阅读说明：本技术 一种恒流输出的中频治疗仪系统 (Constant-current output intermediate frequency therapeutic instrument system ) 是由 张元良 李泽新 宫迎娇 杨贺 贾海生 丁明超 孙源 程绍辉 咸宏伟 胡宁 葛志鹏 于 2019-12-16 设计创作，主要内容包括：本发明一种恒流输出的中频治疗仪系统属于医用康复治疗设备领域,涉及一种中频治疗仪能实现恒流输出的系统。该系统由控制模块、波形调制模块、强度调节模块和恒流放大模块组成,实现载波的生成、调制、强度调节、放大和输出。控制模块其输入端与检测反馈模块相连接,控制模块的输出端分别与显示模块、报警模块、存储模块相连接；控制模块还与波形调制模块和强度调节模块连接。波形调制模块采用的是幅值调制,将一个高频载波信号与低频调制信号相乘,使得高频信号的幅值随低频信号幅值的变化而变化。该系统在单片机的控制下实现恒流输出,保证患者的安全。有存储功能,方便记录,提升了治疗仪的实用性和便捷性。(The invention discloses a constant-current output medium-frequency therapeutic apparatus system, belongs to the field of medical rehabilitation treatment equipment, and relates to a system capable of realizing constant-current output of a medium-frequency therapeutic apparatus. The system consists of a control module, a waveform modulation module, an intensity regulation module and a constant current amplification module, and realizes generation, modulation, intensity regulation, amplification and output of carrier waves. The input end of the control module is connected with the detection feedback module, and the output end of the control module is respectively connected with the display module, the alarm module and the storage module; the control module is also connected with the waveform modulation module and the intensity adjustment module. The waveform modulation module adopts amplitude modulation, and multiplies a high-frequency carrier signal by a low-frequency modulation signal, so that the amplitude of the high-frequency signal changes along with the change of the amplitude of the low-frequency signal. The system realizes constant current output under the control of the singlechip, and ensures the safety of patients. Has the storage function, is convenient for recording, and improves the practicability and convenience of the therapeutic apparatus.)
1. A constant-current output intermediate frequency therapeutic instrument system is provided with a display module, an alarm module, a storage module and a power supply module, and is characterized by also comprising a control module, a waveform modulation module, an intensity regulation module, a constant-current power amplification module and a detection feedback module; the generation, modulation, intensity regulation, amplification and constant current output of a carrier wave are realized;
the input end of the control module is connected with the detection feedback module, and the output end of the control module is respectively connected with the display module, the alarm module and the storage module; the control module is also connected with the waveform modulation module and the intensity adjustment module, and is responsible for controlling other chips, receiving data acquired by other chips and processing the data; the internal timer generates a high-frequency square wave signal which can be adjusted to 1-9 kHz; the generated high-frequency square wave signal enters a waveform modulation module for amplitude modulation to modulate a required low-frequency waveform signal; the low-frequency modulation signal after amplitude modulation is subjected to current intensity adjustment through an intensity adjustment module, and the low-frequency signal after intensity adjustment is subjected to power amplification through a constant current amplification module; the intensity adjusting signal amplified by the constant current directly acts on a patient through the electrode slice to realize treatment;
the waveform modulation module adopts amplitude modulation, and multiplies a high-frequency carrier signal by a low-frequency modulation signal, so that the amplitude of the high-frequency signal changes along with the change of the amplitude of the low-frequency signal. The high-frequency carrier wave of the system is a square wave of 1-9 kHz, and the waveform modulation module is controlled by the singlechip to modulate various low-frequency signals including sine waves, triangular waves, trapezoidal waves, spike waves, rectangular waves and sawtooth waves. These low frequency modulated signals are combined to generate a plurality of prescriptions.
The waveform modulation module circuit comprises a triode U1, a digital-to-analog converter U2 and operational amplificationA U3, a resistor R1 and a resistor R2; the B-stage of the triode U1 is connected with one end of a resistor R1 and a pin of a single chip microcomputer PE8, the E-stage is connected with a +5V power supply, and the C-stage is connected with a sixth pin REFIN of a digital-to-analog converter U2 and one end of a resistor R2; the other end of the resistor R1 is connected with a +5V power supply, and the other end of the resistor R2 is connected with GND; DEN, SCLK of digital-to-analog converter U2,
the intensity adjusting module comprises a digital-to-analog converter U4 and an operational amplifier U5; among them, DEN, SCLK of D/A converter U4,
the constant current power amplification module is the key of the system, and the current intensity is almost unchanged under different loads; the constant current power amplification module is a voltage-controlled constant current source circuit consisting of an operational amplifier and a high-power field effect transistor, and realizes constant current output by using current feedback; the module specifically comprises: an operational amplifier IC1, a MOS tube M1, resistors R41, R42, R43, R44, R45, R46 and R47, a DCDC module, capacitors C41 and C42, an inductor L1, fuses F2 and F3, a magnetic bead CZ1 and a suppressor diode D1; pin 2 of the operational amplifier IC1 is connected with one end of a resistor R43, pin 3 is connected with GND, pin 4 of the output end is connected with one end of a resistor R42, and pin 5 is connected with + 15V; the other end of the resistor R42 is connected with one end of the resistor R41 and the G level of the MOS transistor M1; the other end of the resistor R43 is connected with one end of the resistor R44 and the S level of the MOS transistor M1, and the other ends of the resistors R41 and R44 are connected with GND; the stage D of the MOS transistor M1 is connected with one ends of resistors R45 and R46 and the OUT _ B end of the electrode slice; the other end of the resistor R45 is connected with the OUT _ A end of the electrode plate and a +100V power supply, the other end of the resistor R46 is connected with the feedback acquisition end V-BACK and one end of the resistor R47, and the other end of the resistor R47 is connected with GND; the + VI end of the DCDC module is connected with one end of a fuse F2 and the positive end of a capacitor C41, the VI end is connected with GND, the + Vo end is connected with one end of a magnetic bead CZ1 and the negative end of a diode D1, and the Vo end is connected with the negative end of the diode D1 and GND; the negative end of a capacitor C41 is connected with GND, the other end of a resistor F2 is connected with +15V, the other end of CZ1 is connected with one end of CZ2, the other end of CZ2 is connected with one end of F3 of a fuse, the other end of F3 of the fuse is connected with an inductor L1, the other end of the inductor L1 is connected with a +100V power supply and one end of a capacitor C42, and the other end of the capacitor C42 is connected with GND;
the detection feedback module amplifies the voltage acquired by the V-BACK through an op2 operational amplifier so that the voltage can be acquired by an ADC pin of the single chip microcomputer, and the ZM4727 is a protection diode to prevent the single chip microcomputer from being burnt out due to overlarge voltage;
when the electrodes are short-circuited, the voltage of 100V is only divided by R46 and R47, and the voltage of V-BACK is as follows:
when the electrode plate is open-circuited, 100V is divided by R45, R46 and R47, and the voltage of V-BACK is as follows:
the returned voltage values are different, the numbers acquired and read by the ADC are different, whether the electrode plate falls off or is short-circuited can be judged, the output is stopped immediately, and harm to a human body or a circuit is avoided.
Technical Field
The invention belongs to the field of medical rehabilitation treatment equipment, and relates to a system for realizing constant-current output of an intermediate-frequency therapeutic apparatus.
Background
The medium frequency electrotherapy is widely used in clinic at present, and stimulates a specific part through a plurality of modulated low frequency electric signals, thereby having the effects of easing pain, promoting local blood circulation, exercising skeletal muscle, improving the tension of smooth muscle and the like.
Through market research, most of the intermediate frequency therapeutic instruments on the domestic market are intermediate frequency electric products with single waveform, the curative effect is single, the adaptability to single signals is generated after a user uses the instrument for a long time, and the instrument is difficult to adapt to various therapeutic requirements. More importantly, the therapeutic apparatus should have a corresponding safety protection function, and if the therapeutic apparatus is not safe well, not only the purpose of rehabilitation cannot be achieved, but also the health of the patient may be damaged. Most therapeutic instruments on the market adopt transformers to amplify output, output current can generate large fluctuation due to instability of load in the treatment process, and electrode slice short circuit and open circuit protection are not provided. For example, in the patent of CN201610005434.X "a modulation method and circuit for the waveform of the prescription for the treatment of middle and low frequency therapeutic apparatus", the waveform is amplified by a high frequency transformer, boosted and then output to human body by connecting an electrode plate. When the impedance of the connected electrode plate changes, the input voltage of the transformer cannot be automatically adjusted, so that the output voltage of the transformer cannot change along with the impedance change, the current applied to a human body can change suddenly, and the danger can be caused when the current is different from the set current.
Most of the existing therapeutic instruments also use an LCD screen or a nixie tube for display, and the traditional keyboard operation is adopted, so that the human-computer interaction is poor, the set parameters cannot be directly reflected, and the output intensity and the treatment mode of a patient are unclear during treatment. The therapeutic apparatus has a generally overlarge body type, is not beneficial to carrying and is not convenient to operate.
Disclosure of Invention
The invention aims to solve the problems that the prior product has the defects that: because the distance between the electrode plates and the position of a human body are different, the connected impedance is different, and the current change can be caused by using the traditional transformer amplification method, the constant-current-output intermediate-frequency therapeutic instrument system is invented. The system adopts the constant current source amplifying circuit, realizes constant current output, does not fluctuate due to load change, and does not cause pain and safety problems to patients caused by overlarge current. The output state of the electrode plate can be detected, and the electrode plate can be controlled in time when in short circuit or open circuit, so that the safety is further improved. The touch screen is used for setting and displaying the treatment parameters and displaying the set parameters, so that the man-machine interaction is improved, and the touch screen is convenient and visual.
The invention adopts the technical scheme that the constant-current output intermediate-frequency therapeutic instrument system is provided with a display module, an alarm module, a storage module and a power supply module, and is characterized by also comprising a control module, a waveform modulation module, an intensity regulation module, a constant-current power amplification module and a detection feedback module; the generation, modulation, intensity regulation, amplification and constant current output of a carrier wave are realized;
the input end of the control module is connected with the detection feedback module, and the output end of the control module is respectively connected with the display module, the alarm module and the storage module; the control module is also connected with the waveform modulation module and the intensity adjustment module, and is responsible for controlling other chips, receiving data acquired by other chips and processing the data; the internal timer generates a high frequency square wave signal that can be tuned to 1 to 9 kHz. The generated high-frequency square wave signal enters a waveform modulation module for amplitude modulation to modulate a required low-frequency waveform signal; the low-frequency modulation signal after amplitude modulation is subjected to current intensity adjustment through an intensity adjustment module, and the low-frequency signal after intensity adjustment is subjected to power amplification through a constant current amplification module; the intensity adjusting signal amplified by the constant current directly acts on a patient through the electrode slice to realize treatment;
the waveform modulation module adopts amplitude modulation, and multiplies a high-frequency carrier signal by a low-frequency modulation signal to ensure that the amplitude of the high-frequency signal changes along with the change of the amplitude of the low-frequency signal; the high-frequency carrier wave of the system is a square wave of 1-9 kHz, and the waveform modulation module is controlled by the singlechip to modulate various low-frequency signals including sine waves, triangular waves, trapezoidal waves, spike waves, rectangular waves and sawtooth waves. These low frequency modulated signals are combined to generate a plurality of prescriptions.
The waveform modulation module circuit comprises a triode U1, a digital-to-analog converter U2, an operational amplifier U3, a resistor R1 and a resistor R2; the B-stage of the triode U1 is connected with one end of a resistor R1 and a pin of a single chip microcomputer PE8, the E-stage is connected with a +5V power supply, and the C-stage is connected with a sixth pin REFIN of a digital-to-analog converter U2 and one end of a resistor R2; the other end of the resistor R1 is connected with a +5V power supply, and the other end of the resistor R2 is connected with GND; DEN, SCLK of digital-to-analog converter U2,
the intensity adjusting module comprises a digital-to-analog converter U4 and an operational amplifier U5; among them, DEN, SCLK of D/A converter U4,
the constant current power amplification module is the key of the system, and the current intensity is almost unchanged under different loads; the constant current power amplification module is a voltage-controlled constant current source consisting of an operational amplifier and a high-power field effect transistor, and realizes constant current output by using current feedback; the module specifically comprises: an operational amplifier IC1, a MOS tube M1, resistors R41, R42, R43, R44, R45, R46 and R47, a DCDC module, capacitors C41 and C42, an inductor L1, fuses F2 and F3, a magnetic bead CZ1 and a suppressor diode D1;
the detection feedback module amplifies the voltage acquired by the V-BACK through an op2 operational amplifier so that the voltage can be acquired by an ADC pin of the single chip microcomputer, and the ZM4727 is a protection diode to prevent the single chip microcomputer from being burnt out due to overlarge voltage;
electricity of 100V when electrodes are short-circuitedThe voltage is only divided by R46 and R47, and the voltage of V-BACK is:
when the electrode plate is open-circuited, 100V is divided by R45, R46 and R47, and the voltage of V-BACK is as follows:
the returned voltage values are different, the numbers acquired and read by the ADC are different, whether the electrode plate falls off or is short-circuited can be judged, the output is stopped immediately, and harm to a human body or a circuit is avoided.
The invention has the advantages that the system realizes constant current output under the control of the singlechip, ensures that the current output does not change along with the change of the load impedance of the human body, and ensures the safety of patients. By using the touch color screen, the man-machine interaction is improved, and the information of the patient can be stored. The short circuit and the open circuit of the electrode plate can be detected, and the safety is further ensured. Meets the requirements of electromagnetic compatibility, electrical safety and the like of national related medical products. The constant current source amplifying circuit is adopted, constant current output is realized, fluctuation caused by load change is avoided, and pain and safety problems caused by overlarge current are avoided for a patient. The output state of the electrode plate can be detected, and control is timely adopted when the electrode plate is short-circuited or open-circuited, so that the safety is further improved. Adopt 7 cun touch screen to control, man-machine interaction is good, and the therapeutic instrument prescription is many, can adapt to multiple treatment demand, and carrier frequency and current strength all can adjust, have the memory function, and convenient recording has promoted the practicality and the convenience of therapeutic instrument.
Drawings
Fig. 1 is a schematic diagram of the connection of the circuit modules in the system of the present invention.
Fig. 2 is a circuit structure diagram of the waveform modulation module according to the present invention.
Fig. 3 is a circuit configuration diagram of the intensity adjustment module of the present invention.
Fig. 4 is a circuit configuration diagram of the constant current power amplification module according to the present invention.
Fig. 5 is a circuit diagram of the detection feedback module according to the present invention.
Detailed Description
The following detailed description of the embodiments of the invention refers to the accompanying drawings and accompanying claims.
Fig. 1 is a schematic connection diagram of circuit modules of the system of the intermediate frequency therapeutic apparatus. The system comprises a control module, a waveform modulation module, an intensity regulation module, a constant current amplification module, a display module, an alarm module, a storage module, a detection feedback module and a power supply module.
The control module is a control part of the system and controls the amplitude of the voltage of an input signal of a digital-to-analog converter in the waveform modulation module to realize the amplitude modulation of the high-frequency square wave signal; controlling an input signal of a digital-to-analog converter of the intensity adjusting module to realize intensity adjustment of the low-frequency modulation signal; controlling the buzzer of the alarm module to sound; controlling data display of a serial port screen of the display module and reading a key value returned by touch of a touch screen key; and controlling the data reading and writing of the memory module EEPROM. And receiving the voltage value acquired by the detection feedback module, reading the sampling voltage by using the AD interface, and detecting the open circuit or short circuit of the electrode plate. And generates an adjustable high-frequency square wave signal of 1 to 9kHz for the subsequent waveform modulation module to use.
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