CN104623802A - Treatment waveform generation device and medium-frequency electrotherapy therapeutic apparatus - Google Patents

Abstract

The invention discloses a treatment waveform generation device and a medium-frequency electrotherapy therapeutic apparatus. The medium-frequency electrotherapy therapeutic apparatus comprises a microcomputer, a first SPI (Serial Peripheral Interface) circuit, a second SPI circuit and the treatment waveform generation device, wherein the treatment waveform generation device is connected with the microcomputer, the first SPI circuit and the second SPI circuit; an input regulating command is converted through the first SPI circuit, so as to output adjusting signals for adjusting the treatment waveform intensity output by the treatment waveform generation device; the second SPI circuit converts the input regulating command, so as to output SPI codes for adjusting the magnitude of positive and negative voltages of a treatment waveform; therefore, parameters of the treatment waveform can be randomly adjusted; furthermore, the microcontroller can be used for identifying a lead-fail state by judging the magnitude of the voltages of the treatment waveform, and the current of the treatment waveform can be calculated to obtain real-time current flowing through a human body and fed back; the treatment current and the lead-fail connection state can be monitored in real time.

Description

A treatment waveform generating device and a medium-frequency electric stimulation treatment instrument

technical field

The invention relates to the field of rehabilitation treatment equipment, in particular to a treatment waveform generating device and a medium-frequency electric stimulation treatment equipment.

Background technique

The intermediate frequency therapeutic instrument mainly realizes the treatment of patients through the change of treatment waveform parameters. However, the existing intermediate frequency therapeutic instruments basically implement one or a limited number of therapeutic waveforms through the circuit, which will make the circuit structure complex, resulting in high circuit costs, poor stability of the therapeutic waveform, and inability to adjust the parameters of the therapeutic waveform. .

In addition, most of the existing intermediate frequency therapeutic instruments use the voltage output mode. When outputting different therapeutic waveforms to treat patients, the impedance of the human body will change due to the different positions of the electrodes and the different distances between the electrodes, resulting in real The voltage waveform acting on the human body has a considerable deviation from the actual output therapeutic waveform, so that the initial therapeutic effect cannot be achieved. However, in the literature and patents related to the intermediate frequency therapeutic apparatus, there are few references to the detection of therapeutic current and lead off detection. Therefore, when using the intermediate frequency therapeutic apparatus, the sudden increase of the current or the incorrect placement of the electrodes will often cause discomfort to the patient.

Therefore, the prior art still needs to be improved and developed.

Contents of the invention

The technical problem to be solved by the present invention is to provide a treatment waveform generating device and an intermediate frequency electric stimulation therapeutic apparatus aiming at solving the problem that the treatment waveform parameters of the existing intermediate frequency therapeutic apparatus cannot be adjusted and the treatment current conduction cannot be detected. Link drop problem.

The technical solution adopted by the present invention to solve technical problems is as follows:

A device for generating therapeutic waveforms, comprising a first waveform control module that processes a first input waveform and outputs a group A of therapeutic waveforms, and a second waveform control module that processes a second input waveform and outputs a group B of therapeutic waveforms, wherein the The first waveform control module includes an adjustment control unit, a conversion amplification unit and a detection unit, and the adjustment control unit, conversion amplification unit, and detection unit are connected in sequence;

The adjustment and control unit is used to adjust the parameters and intensity of the first input waveform, and convert it into positive and negative pressure treatment waveforms, and the conversion and amplification unit performs current conversion and amplitude amplification on the treatment waveforms to output group A treatment waveforms , the detection unit detects the current and voltage of the treatment waveform of group A and outputs it.

In the treatment waveform generating device, the adjustment control unit includes:

A digital-to-analog conversion circuit, configured to perform digital-to-analog conversion on the first input waveform to generate a first treatment waveform;

A low-pass filter circuit, configured to filter the first treatment waveform to obtain a second treatment waveform;

The intensity adjustment circuit is used to adjust the voltage intensity of the second treatment waveform according to the input adjustment signal, and output the third treatment waveform;

a neutral line regulating circuit, for generating a neutral line;

Subtractive amplification circuit, used to subtract the midline from the third therapeutic waveform of the positive waveform and amplify it to obtain the fourth therapeutic waveform of positive and negative pressure;

The digital-to-analog conversion circuit, low-pass filter circuit, strength adjustment circuit, and subtraction amplifier circuit are connected in sequence, the neutral line adjustment circuit is connected to the subtraction amplifier circuit, and the subtraction amplifier circuit is connected to the conversion amplifier unit.

In the treatment waveform generating device, the conversion and amplification unit includes:

A voltage-current conversion circuit, used to convert the fourth treatment waveform of the voltage type into the fifth treatment waveform of the current type;

A transformer amplifying circuit, used to amplify the amplitude of the fifth treatment waveform to obtain group A treatment waveform;

The voltage-current conversion circuit is connected with a subtraction amplifier circuit and a transformer amplifier circuit, and the transformer amplifier circuit is connected with a detection unit.

In the treatment waveform generating device, the detection unit includes:

A drop-off detection circuit is used to detect the voltage change state of the sixth treatment waveform;

The current detection circuit is used to detect the current change state of the sixth treatment waveform;

An analog-to-digital conversion circuit, which is used to convert the voltage and current of the sixth treatment waveform to output after analog-to-digital conversion;

The drop detection circuit is connected to the transformer amplifying circuit and the analog-to-digital conversion circuit, and the current detection circuit is connected to the transformer amplifying circuit and the analog-to-digital conversion circuit.

In the treatment waveform generating device, the low-pass filter circuit includes a first operational amplifier, a second operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, The third capacitor and the fourth capacitor; the inverting input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier, and is also connected to one end of the first resistor through the first capacitor, and the positive input terminal of the first operational amplifier is passed through The second resistor is connected to one end of the first resistor, and grounded through the second capacitor, and the other end of the first resistor is connected to the output terminal of the digital-to-analog conversion circuit through the third resistor, and grounded through the third capacitor; the first operation The output terminal of the amplifier is connected to the positive input terminal of the second operational amplifier, and the negative input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier and one end of the fourth resistor, and the other end of the fourth resistor is connected to the strength adjustment The circuit is also grounded through the fourth capacitor.

In the treatment waveform generating device, the intensity adjustment circuit includes a first digital potentiometer, a fifth resistor and a fifth capacitor; the first end of the first digital potentiometer is connected to one end of the fifth resistor through the fifth capacitor , the other end of the fifth resistor is connected to the other end of the fourth resistor, the second end of the first digital potentiometer is connected to the first SPI circuit, and the third end of the first digital potentiometer is connected to the subtraction amplifier circuit.

In the treatment waveform generating device, the neutral line adjustment circuit includes a second digital potentiometer, the first end of the second digital potentiometer is connected to the power supply terminal, and the second end of the second digital potentiometer is connected to the second SPI circuit , the third end of the second digital potentiometer is connected to the subtraction amplifier circuit.

In the treatment waveform generating device, the subtraction amplifier circuit includes a third operational amplifier, a sixth resistor, a seventh resistor, an eighth resistor and a ninth resistor; the positive input terminal of the third operational amplifier passes through the sixth The resistor is connected to the third terminal of the first digital potentiometer, the positive input terminal of the third operational amplifier is also connected to the output terminal of the third operational amplifier through the seventh resistor, and the negative input terminal of the third operational amplifier is connected to the first terminal through the eighth resistor. The third terminal of the second digital potentiometer is also grounded through the ninth resistor; the output terminal of the third operational amplifier is connected to the voltage-current conversion circuit.

In the treatment waveform generating device, the voltage-current conversion circuit includes a fourth operational amplifier, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a fourteenth resistor; The positive input end of the amplifier is connected to one end of the tenth resistor and one end of the eleventh resistor, the other end of the tenth resistor is connected to the output end of the third operational amplifier, and the other end of the eleventh resistor is connected to the twelfth resistor. One end and the transformer amplifying circuit, the other end of the twelfth resistor is connected to the output end of the fourth operational amplifier, the reverse input end of the fourth operational amplifier is grounded through the thirteenth resistor, and connected to the fourth operational amplifier through the fourteenth resistor output.

In the treatment waveform generating device, the transformer amplifying circuit includes a transformer and a fifteenth resistor, one end of the primary winding of the transformer is connected to the other end of the eleventh resistor and one end of the twelfth resistor, and the other end of the primary winding of the transformer is One end is grounded, one end of the transformer secondary winding is connected to the shedding detection circuit and electrode sheet A, the other end of the transformer secondary winding is connected to one end of the fifteenth resistor, and the other end of the fifteenth resistor is connected to the current detection circuit and electrode sheet B.

In the treatment waveform generating device, the shedding detection circuit includes a first diode, a second diode, a third diode, a sixteenth resistor, a seventeenth resistor and an eighteenth resistor; The anode of the first diode is connected to one end of the secondary winding of the transformer, the cathode of the first diode is connected to one end of the seventeenth resistor and one end of the eighteenth resistor through the sixteenth resistor, and the other end of the seventeenth resistor One end is grounded, the other end of the eighteenth resistor is connected to the positive pole of the second diode, the negative pole of the third diode and the analog-to-digital conversion circuit, the negative pole of the second diode is connected to the power supply terminal, and the third diode positive ground.

In the treatment waveform generating device, the current detection circuit includes a fifth operational amplifier, a sixth operational amplifier, a fourth diode, a nineteenth resistor, a twentieth resistor, a twenty-first resistor and a twenty-first resistor Two resistors; the reverse input terminal of the fifth operational amplifier is connected to the cathode of the fourth diode, one end of the twentieth resistor and one end of the twenty-first resistor through the nineteenth resistor, and the fourth diode The positive electrode of the 20th resistor is connected to the output terminal of the fifth operational amplifier, the other end of the 21st resistor is connected to the other end of the 15th resistor and the electrode sheet B, and the positive electrode of the fifth operational amplifier is The input end is grounded through the twenty-second resistor, the output end of the fifth operational amplifier is connected to the positive input end of the sixth operational amplifier, and the reverse input end of the sixth operational amplifier is connected to the output end of the sixth operational amplifier and the analog-to-digital conversion circuit .

A kind of medium-frequency electrical stimulation therapeutic apparatus, comprises microprocessor, first SPI circuit and second SPI circuit, and it also comprises described treatment waveform generation device; Described treatment waveform generation device is connected microprocessor, first SPI circuit and Second SPI circuit;

The first SPI circuit is used to convert the input adjustment instruction, and output an adjustment signal to adjust the intensity of the treatment waveform output by the treatment waveform generating device; the second SPI circuit is used to convert the input control instruction, and output the SPI code to adjust the intensity of the treatment waveform. The positive and negative pressure of the treatment waveform; the microcontroller judges the voltage of the treatment waveform to identify the lead off state, and also calculates the current of the treatment waveform to obtain the real-time current flowing through the human body and feedback.

Compared with the prior art, the present invention provides a treatment waveform generating device and an intermediate frequency electric stimulation therapeutic apparatus, which converts the adjustment command input by the user through the first SPI circuit, and outputs an adjustment signal to adjust the treatment waveform output by the treatment waveform generating device. Intensity; the second SPI circuit converts the control command input by the user, and outputs SPI code to adjust the positive and negative pressure of the treatment waveform; in this way, any adjustment of the treatment waveform parameters can be realized; and, the microcontroller controls the treatment waveform. The voltage of the waveform is judged to identify the lead-off state, and the current of the treatment waveform is calculated to obtain the real-time current flowing through the human body and fed back; the purpose of real-time monitoring of the therapeutic current and the connection state of the lead-off is achieved.

Description of drawings

Fig. 1 is a structural block diagram of an application example of a medium-frequency electric stimulation therapeutic apparatus provided by the present invention.

Fig. 2 is a circuit diagram of a low-pass filter circuit in the treatment waveform generating device provided by the present invention.

Fig. 3 is a circuit diagram of the intensity adjustment circuit in the treatment waveform generating device provided by the present invention.

Fig. 4 is a circuit diagram of the neutral line adjustment circuit in the treatment waveform generating device provided by the present invention.

Fig. 5 is a circuit diagram of the subtraction and amplification circuit in the treatment waveform generating device provided by the present invention.

Fig. 6 is a circuit diagram of a voltage-current conversion circuit and a transformer amplifying circuit in the treatment waveform generating device provided by the present invention.

Fig. 7 is a circuit diagram of the shedding detection circuit in the treatment waveform generating device provided by the present invention.

Fig. 8 is a circuit diagram of an application embodiment of the current detection circuit in the treatment waveform generating device provided by the present invention.

Detailed ways

The invention provides a treatment waveform generating device and an intermediate frequency electric stimulation treatment apparatus, which can generate two sets of treatment waveforms whose output waveform parameters can be adjusted arbitrarily, and perform functional electric stimulation treatment on patients; it can also monitor the treatment acting on the patient's body in real time Electric current provides the basis for adjusting waveform parameters by feeding back the treatment current, and judges the lead off according to the magnitude of the treatment current, realizing the functions of intelligently adjusting the intensity of electric stimulation treatment and detecting lead off. In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Based on the general treatment waveform, it is divided into two groups, A and B, and the waveforms of the two groups are symmetrical. For this reason, the treatment waveform generating device provided by the present invention includes a first waveform control module and a second waveform control module, and the circuit structures of the two waveform control modules are completely the same. The first waveform control module outputs a group A of treatment waveforms after performing correlation processing on the first input waveform. The second waveform control module outputs group B of treatment waveforms after performing correlation processing on the second input waveform. The medium-frequency electrical stimulation therapeutic apparatus includes the first waveform control module, the second waveform control module, the first SPI circuit, the second SPI circuit and a microcontroller.

Taking the first waveform control module as an example, please refer to FIG. 1 , the first waveform control module includes an adjustment control unit 10 , a conversion amplification unit 20 and a detection unit 30 . The adjustment control unit 10, the conversion and amplification unit 20, and the detection unit 30 are connected in sequence. The adjustment control unit 10 is used to adjust the parameters and intensity of the first input waveform, and convert it into positive and negative pressure treatment waveforms. The conversion and amplifying unit 20 performs current conversion and power amplification on the treatment waveforms to output group A treatment waveforms, and the detection unit 30 detects the current and voltage of the A group treatment waveforms and transmits them to the microcontroller. The microcontroller calculates the actual current according to the current and feeds it back to the user, so that the user can adjust the current of group A treatment waveform. The micro-controller also judges the detachment state of the lead between the electrode piece and the human body according to the magnitude of the voltage.

Both the first SPI circuit and the second SPI circuit are connected to the regulation control unit 10 . The first SPI circuit is used to convert the adjustment instruction input by the user, and output an adjustment signal to the adjustment control unit 10 as a basis for intensity adjustment. The SPI code output by the second SPI circuit is sent to the adjustment control unit 10 as the basis for adjusting the positive and negative pressures.

Wherein, the adjustment control unit 10 includes a digital-to-analog conversion circuit 101 , a low-pass filter circuit 102 , an intensity adjustment circuit 103 , a neutral line adjustment circuit 104 and a subtraction amplifier circuit 105 . The conversion and amplification unit 20 includes a voltage and current conversion circuit 201 and a transformer amplification circuit 202 . The detection unit 30 includes a drop detection circuit 301 , a current detection circuit 302 and an analog-to-digital conversion circuit 303 . The digital-to-analog conversion circuit 101, the low-pass filter circuit 102, the strength adjustment circuit 103, and the subtraction amplifier circuit 105 are sequentially connected, the neutral line adjustment circuit 104 is connected to the subtraction amplifier circuit 105, the subtraction amplifier circuit 105, the voltage-current conversion circuit 201 The transformer amplifying circuit 202 is connected sequentially, the drop detection circuit 301 is connected to the transformer amplifying circuit 202 and the analog-to-digital conversion circuit 303 , and the current detection circuit 302 is connected to the transformer amplifying circuit 202 and the analog-to-digital conversion circuit 303 .

The first input waveform is a discrete signal in the form of a binary digital quantity, which needs to be digital-to-analog converted by the digital-to-analog conversion circuit 101 first to generate the first treatment waveform TP1. The first treatment waveform is an analog quantity based on a standard quantity (or reference quantity). In this embodiment, based on the fact that the first input waveform is artificially input according to the treatment requirements, the parameters of the first input waveform, such as frequency and waveform shape, can be adjusted.

Since the first treatment waveform TP1 generated after digital-to-analog conversion contains rich high-frequency components, it needs to be filtered by the low-pass filter circuit 102 to obtain the second treatment waveform TP2. The intensity adjustment circuit 103 adjusts the voltage intensity of the second treatment waveform according to the adjustment signal input by the first SPI circuit, and outputs the third treatment waveform TP3.

Since the microcontroller can only output the first input waveform in the positive direction, the first treatment waveform TP1 , the second treatment waveform TP2 and the third treatment waveform TP3 are all positive waveforms. Generally, the treatment waveforms acting on patients are positive and negative waveforms. For this reason, this embodiment also generates a midline VT through the midline adjustment circuit, and then subtracts the midline VT from the third treatment waveform TP3 of the positive waveform through the subtraction amplification circuit 105 and amplifies it. , the fourth treatment waveform TP4 of positive and negative pressure can be obtained. Wherein, the voltage of the neutral line VT is adjusted by the SPI code input by the second SPI circuit.

The voltage-current conversion circuit 201 converts the voltage-type fourth treatment waveform TP4 into the current-type fifth treatment waveform TP5, and the transformer amplifying circuit amplifies the amplitude of the fifth treatment waveform TP5 to obtain the sixth treatment waveform (TP61, TP62), that is, It is the treatment waveform of group A. The amplified sixth treatment waveform (TP61, TP62) is connected to the human body through electrode sheets (A, B) for electrical stimulation therapy.

In order to facilitate patients to understand the connection of the electrode pads, this embodiment detects the voltage of the first detection waveform Ta (that is, the sixth treatment waveform TP61) through the shedding detection circuit, and transmits it to the microcontroller after analog-to-digital conversion through the analog-to-digital conversion circuit . The microcontroller can identify the lead-off state by judging the voltage of the first detection waveform Ta.

In order to make it easier for patients to understand the current magnitude of the treatment wave in group A, this embodiment detects the current of the second detection waveform Tb (namely the sixth treatment waveform TP62) through the current detection circuit, and transmits it to the microcontroller after being converted by the analog-to-digital conversion circuit. The microcontroller calculates the current magnitude of the second detection waveform Tb to obtain the real-time current flowing through the human body and feeds it back, thus forming a feedback system to realize intelligent regulation of the current.

The medium-frequency electrical stimulation therapeutic apparatus adjusts the treatment waveform in real time according to the real-time current and the lead-off state, so that the treatment waveform acting on the human body is the same as that generated by the microprocessor, thereby improving the performance of the entire system.

In this embodiment, the digital-to-analog conversion circuit 101 and the analog-to-digital conversion circuit 303 are prior art, and their specific circuit structures are not described in detail here.

Please also refer to FIG. 2, the low-pass filter circuit 102 includes a first operational amplifier OP1, a second operational amplifier OP2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4. The inverting input terminal of the first operational amplifier OP1 is connected to the output terminal of the first operational amplifier OP1, and is also connected to one end of the first resistor R1 through the first capacitor C1, and the positive input terminal of the first operational amplifier OP1 is connected to the first terminal of the first resistor R1 through the second resistor R2 is connected to one end of the first resistor R1, and grounded through the second capacitor C2, and the other end of the first resistor R1 is connected to the output end of the digital-to-analog conversion circuit 101 through the third resistor R3, and grounded through the third capacitor C3; The output terminal of the first operational amplifier OP1 is connected to the positive input terminal of the second operational amplifier OP2, and the inverting input terminal of the second operational amplifier OP2 is connected to the output terminal of the second operational amplifier OP2 and one end of the fourth resistor R4. The other end of the fourth resistor R4 is connected to the strength adjustment circuit and grounded through the fourth capacitor C4.

Wherein, the first operational amplifier OP1, the first resistor R1, the second resistor R2, the third resistor R3, the first capacitor C1, the second capacitor C2 and the third capacitor C3 form an active second-order low-pass filter, so The second operational amplifier OP2, the fourth resistor R4 and the fourth capacitor C4 form an RC filter. By adjusting the resistance value of these resistors and the capacitance value of the capacitor, the cut-off frequency can be adjusted, so that the useful frequency component in the first treatment waveform TP1 can pass smoothly, so that the second treatment waveform TP2 is output at the other end of the fourth resistor R4 to the intensity regulation circuit.

Please also refer to FIG. 3 , the intensity adjustment circuit includes a first digital potentiometer U1, a fifth resistor R5 and a fifth capacitor C5; the first terminal of the first digital potentiometer U1 is connected to the fifth capacitor through the fifth capacitor C5 One end of the resistor R5 and the other end of the fifth resistor R5 are connected to the other end of the fourth resistor R4. The second end of the first digital potentiometer U1 is connected to the first SPI (Serial Peripheral interface) circuit. The third end of the first digital potentiometer U1 is connected to the subtraction amplifier circuit.

Since the second treatment waveform TP2 output by the low-pass filter circuit contains a DC component, the DC component does not need to be amplified when adjusting the intensity. Therefore, the DC component is filtered out by the fifth capacitor C5, and then the amplitude is adjusted by the first digital potentiometer U1. The first SPI circuit is used to convert the adjustment command input by the user, and output an adjustment signal to the first digital potentiometer U1 to adjust the stimulation voltage intensity, thereby obtaining the third treatment waveform TP3. Since the adjustment instruction can be edited arbitrarily, the treatment intensity realized by the first digital potentiometer U1 can be changed in any way, such as increasing or decreasing.

Please also refer to FIG. 4. In this embodiment, the neutral line adjustment circuit includes a second digital potentiometer U2, the first end of the second digital potentiometer U2 is connected to the power supply terminal VCC, and the first end of the second digital potentiometer U2 is Terminal 2 is connected to the second SPI circuit, and terminal 3 of the second digital potentiometer U2 is connected to the subtraction amplifier circuit.

The SPI code output by the second SPI circuit is used to control the second digital potentiometer U2 to adjust the voltage of the neutral line. According to the formula VT=K*VCC, the voltage value of the output neutral line VT changes according to the coefficient K, and the coefficient K is less than or equal to 1. The neutral line adjustment circuit actually adjusts the value of the coefficient K through the input SPI code, so as to realize the voltage regulation of the neutral line VT. The voltage value of the neutral line affects the voltage amplitude of subsequent positive and negative waveforms.

The third treatment waveform TP3 and the midline VT are transmitted to the subtraction and amplification circuit for subtraction and amplification. Please also refer to FIG. 5 , the subtraction amplifier circuit includes a third operational amplifier OP3, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9; the positive input of the third operational amplifier OP3 terminal is connected to the third terminal of the first digital potentiometer through the sixth resistor R6, the positive input terminal of the third operational amplifier OP3 is also connected to the output terminal of the third operational amplifier OP3 through the seventh resistor R7, and the negative input terminal of the third operational amplifier OP3 The input end is connected to the third end of the second digital potentiometer U2 through the eighth resistor R8, and grounded through the ninth resistor R9. The output end of the third operational amplifier OP3 is connected to the voltage-current conversion circuit.

The subtraction amplifier circuit performs differential amplification on the third treatment waveform TP3 and the midline VT, according to the formula , the amplitude of the fourth treatment waveform TP4 can be obtained. It should be noted that in this embodiment, the power supply of the third operational amplifier OP3 is powered by positive and negative voltages, so as to ensure that the fourth treatment waveform TP4 is a treatment waveform of positive and negative pressures. The fourth therapeutic waveform TP4 is input into the voltage-current conversion circuit.

Please also refer to FIG. 6, the voltage-current conversion circuit 201 includes a fourth operational amplifier OP4, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13 and a fourteenth resistor R14; The positive input end of the fourth operational amplifier OP4 is connected to one end of the tenth resistor R10 and one end of the eleventh resistor R11, the other end of the tenth resistor R10 is connected to the output end of the third operational amplifier OP3, and the eleventh resistor R10 is connected to the output end of the third operational amplifier OP3. The other end of the resistor R11 is connected to one end of the twelfth resistor R12 and the transformer amplifying circuit, the other end of the twelfth resistor R12 is connected to the output end of the fourth operational amplifier OP4, and the reverse input end of the fourth operational amplifier OP4 passes through the thirteenth operational amplifier. The resistor R13 is grounded, and is also connected to the output terminal of the fourth operational amplifier OP4 through the fourteenth resistor R14.

The transformer amplifying circuit 202 includes a transformer T and a fifteenth resistor R15, one end of the primary winding of the transformer T is connected to the other end of the eleventh resistor R11 and one end of the twelfth resistor R12, and the other end of the primary winding of the transformer T is grounded , one end of the secondary winding of transformer T is connected to the shedding detection circuit and electrode sheet A, the other end of the secondary winding of transformer T is connected to one end of the fifteenth resistor R15, and the other end of the fifteenth resistor R15 is connected to the current detection circuit and electrode sheet B .

The fourth treatment waveform TP4 of positive and negative pressure needs to be converted into voltage and current, so that the fourth treatment waveform TP4 of voltage type is converted into the fifth treatment waveform TP5 of current type. In this embodiment, the voltage-current conversion circuit adopts a power amplifier circuit, and the power of the fourth treatment waveform TP4 is also fully amplified when performing current conversion. Then, the amplitude of the fifth treatment waveform TP5 is amplified through the transformer T. The current of the fifth treatment waveform TP5 . Among them, the requirement . In this way, the input voltage V _TP4 can be converted into the current I- _L , that is, the fourth therapeutic waveform TP4 of voltage type can be converted into the fifth therapeutic waveform TP5 of current type.

Then, the current-type fifth treatment waveform TP5 is further amplified in voltage (that is, amplitude amplified) through the transformer, and at the same time, the transformer T also plays an isolation role. The amplified sixth therapeutic waveform (TP61, TP62) is connected to the human body (the _human body is represented by R in Figure 6) through the electrode sheets (A, B), so as to realize the therapeutic effect of electrical stimulation.

In order to ensure that the electrode pads are in a normal connection state with the human body, the sixth treatment waveform (TP61) is used in this embodiment as the electrode pad drop-off detection. Please also refer to FIG. 7 , the drop detection circuit includes a first diode D1, a second diode D2, a third diode D3, a sixteenth resistor R16, a seventeenth resistor R17 and an eighteenth resistor R18. The anode of the first diode D1 is connected to one end of the secondary winding of the transformer T, and the cathode of the first diode D1 is connected to one end of the seventeenth resistor R17 and one end of the eighteenth resistor R18 through the sixteenth resistor R16, The other end of the seventeenth resistor R17 is grounded, the other end of the eighteenth resistor R18 is connected to the anode of the second diode D2, the cathode of the third diode D3 and the analog-to-digital conversion circuit, the second diode The cathode of the tube D2 is connected to the power supply terminal VCC, and the anode of the third diode D3 is grounded.

The amplitude of the sixth treatment waveform output through voltage-current conversion and transformer amplification may increase to tens of volts, and the amplitude is relatively high. Then, when detecting the falling off of the electrode sheet, it is necessary to divide the voltage, according to the formula , by adjusting the resistance of R16 and R17, the output voltage V _TPa can be controlled within the tolerance range of the microcontroller. R18 mainly acts as a current limiter. In this way, the voltage value of the first detection waveform Ta will be different when the electrode sheet is disconnected and connected. The first detection waveform Ta is converted by the analog-to-digital conversion circuit and then transmitted to the microcontroller. The microcontroller can identify the lead-off state by judging the voltage of the first detection waveform Ta. During specific implementation, the determination of the voltage magnitude of the first detection waveform Ta is specifically to identify the waveform type of the first detection waveform Ta according to the variation of the voltage magnitude. If the first detection waveform Ta is a sine wave, it means that it is disconnected, and if it is a sawtooth wave, it means that it is connected; based on the fact that the waveforms of a sine wave and a sawtooth wave (straight up or down) are obviously different, the microcontroller can identify the difference between the sine wave and the sawtooth wave through a related algorithm. Sawtooth wave, so as to judge the lead-off state.

In order to ensure the stability of the first detection waveform Ta, the fall-off detection circuit further includes a sixth capacitor C6 and a seventh capacitor C7, one end of the sixth capacitor C6 is connected to the negative pole of the first diode D1, and the sixth capacitor C6 The other end of the seventh capacitor C7 is connected to the anode of the second diode D2, the cathode of the third diode D3 and the analog-to-digital conversion circuit, and the other end of the seventh capacitor C7 is connected to the ground.

Lead-off detection is qualitative, while amperometric detection is quantitative. Please also refer to FIG. 8 , the current detection circuit includes a fifth operational amplifier OP5, a sixth operational amplifier OP6, a fourth diode D4, a nineteenth resistor R19, a twentieth resistor R20, and a twenty-first resistor R21 and the twenty-second resistor R22; the reverse input terminal of the fifth operational amplifier OP5 is connected to the negative pole of the fourth diode D4, one end of the twentieth resistor R20 and the twenty-first resistor R21 through the nineteenth resistor R19 One end of the fourth diode D4 is grounded, the other end of the twentieth resistor R20 is connected to the output end of the fifth operational amplifier OP5, and the other end of the twenty-first resistor R21 is connected to the other end of the fifteenth resistor R15 One end and the electrode sheet B, the positive input terminal of the fifth operational amplifier OP5 is grounded through the twenty-second resistor R22, the output terminal of the fifth operational amplifier OP5 is connected to the positive input terminal of the sixth operational amplifier OP6, and the sixth operational amplifier OP5 is connected to the positive input terminal of the sixth operational amplifier OP6. The inverting input terminal of the amplifier OP6 is connected to the output terminal of the sixth operational amplifier OP6 and the analog-to-digital conversion circuit.

When the electrode sheet is connected to the human body, the secondary winding of the transformer T, the human body (R _person ), and the fifteenth resistor R15 form a loop, so the current passing through the fifteenth resistor R15 is the current passing through the human body. In this embodiment, the current is reversely calculated by measuring the voltage on the fifteenth resistor R15. Since V _TP62 = I _ren × R15, V _TP62 = V _TPb , , V _TPc =V _Tb , in this way, it can be deduced that _I = . The second detection waveform Tb is converted by the analog-to-digital conversion circuit and then transmitted to the microcontroller. The microcontroller calculates the current magnitude of the second detection waveform Tb to obtain a real-time current value ( _I ), thereby realizing current detection. It should be noted that when selecting the fifteenth resistor R15, it is necessary to select a high-precision resistor, so as to ensure the accuracy of current detection.

In order to ensure the accuracy of current detection, the current detection circuit also includes an eighth capacitor C8, a twenty-third resistor R23, a twenty-fourth resistor R24 and a twenty-fifth resistor R25, one end of the eighth capacitor C8 is connected to One end of the twenty-first resistor R21, one end of the twenty-third resistor R23 and one end of the twenty-fourth resistor R24, the other end of the eighth capacitor C8 is grounded, the other end of the twenty-third resistor R23 is grounded, and the twentieth The other end of the fourth resistor R24 is connected to the negative pole of the fourth diode D4, and also connected to the inverting input end of the fifth operational amplifier OP5 through the nineteenth resistor R19, and one end of the twenty-fifth resistor R25 is connected to the fifth operational amplifier OP5. At the output end, the other end of the twenty-fifth resistor R25 is connected to the positive input end of the sixth operational amplifier OP6.

To sum up, the treatment waveform generating device and the medium-frequency electrical stimulation therapeutic apparatus provided by the present invention have the following advantages:

1. The intensity and positive and negative pressure of the treatment waveform can be adjusted, and the parameters of the treatment waveform can be adjusted arbitrarily. The circuit structure is simple, the whole system is low in cost, and the stability of the treatment waveform is good.

2. The prior art uses a voltage-type electric stimulation treatment waveform, while the present invention uses a current-type electric stimulation treatment waveform. Because the different positions of the electrodes or the different distances between the electrodes will lead to changes in the impedance of the human body, the current-type electrical stimulation treatment waveform is used so that the therapeutic current applied to the human body will not change with the change of the impedance of the human body, so that the intermediate frequency The height of the treatment waveform output by the electrical stimulation therapy device is consistent with the treatment waveform actually acting on the human body, achieving better expected treatment effects.

3. The present invention adds the lead off detection function. When using the medium-frequency electric stimulation therapeutic instrument, there will be no risk of electric shock due to mistaken contact with the electrode, and it can also remind the user of the poor contact or fall off of the electrode, thereby greatly increasing the use of safety and effectiveness.

4. The present invention adds a current detection function. When the current of the treatment waveform increases suddenly, it can feed back to the user to adjust the current in real time; it can avoid the discomfort caused by the sudden increase of the current. Moreover, the user can also compare the real-time monitored current with the treatment intensity, making the operation of the treatment device easier and more reliable.

It should be understood that the application of the present invention is not limited to the above examples, and those skilled in the art can make improvements or transformations according to the above descriptions, and all these improvements and transformations should belong to the protection scope of the appended claims of the present invention.

Claims (13)

1. A treatment waveform generating device, comprising a first waveform control module that processes the first input waveform and outputs a group A treatment waveform, and a second waveform control module that processes the second input waveform and outputs a group B treatment waveform, which It is characterized in that the first waveform control module includes an adjustment control unit, a conversion amplification unit, and a detection unit, and the adjustment control unit, conversion amplification unit, and detection unit are sequentially connected; The adjustment and control unit is used to adjust the parameters and intensity of the first input waveform, and convert it into positive and negative pressure treatment waveforms, and the conversion and amplification unit performs current conversion and amplitude amplification on the treatment waveforms to output group A treatment waveforms , the detection unit detects the current and voltage of the treatment waveform of group A and outputs it. 2. The treatment waveform generating device according to claim 1, wherein the adjustment control unit comprises: A digital-to-analog conversion circuit, configured to perform digital-to-analog conversion on the first input waveform to generate a first treatment waveform; A low-pass filter circuit, configured to filter the first treatment waveform to obtain a second treatment waveform; The intensity adjustment circuit is used to adjust the voltage intensity of the second treatment waveform according to the input adjustment signal, and output the third treatment waveform; a neutral line regulating circuit, for generating a neutral line; Subtractive amplification circuit, used to subtract the midline from the third therapeutic waveform of the positive waveform and amplify it to obtain the fourth therapeutic waveform of positive and negative pressure; The digital-to-analog conversion circuit, low-pass filter circuit, strength adjustment circuit, and subtraction amplifier circuit are connected in sequence, the neutral line adjustment circuit is connected to the subtraction amplifier circuit, and the subtraction amplifier circuit is connected to the conversion amplifier unit. 3. The treatment waveform generating device according to claim 2, wherein the conversion and amplification unit comprises: A voltage-current conversion circuit, used to convert the fourth treatment waveform of the voltage type into the fifth treatment waveform of the current type; A transformer amplifying circuit, used to amplify the amplitude of the fifth treatment waveform to obtain group A treatment waveform; The voltage-current conversion circuit is connected with a subtraction amplifier circuit and a transformer amplifier circuit, and the transformer amplifier circuit is connected with a detection unit. 4. The treatment waveform generating device according to claim 3, wherein the detection unit comprises: A drop-off detection circuit is used to detect the voltage change state of the sixth treatment waveform; The current detection circuit is used to detect the current change state of the sixth treatment waveform; An analog-to-digital conversion circuit, which is used to convert the voltage and current of the sixth treatment waveform to output after analog-to-digital conversion; The drop detection circuit is connected to the transformer amplifying circuit and the analog-to-digital conversion circuit, and the current detection circuit is connected to the transformer amplifying circuit and the analog-to-digital conversion circuit. 5. The treatment waveform generator according to claim 4, wherein the low-pass filter circuit comprises a first operational amplifier, a second operational amplifier, a first resistor, a second resistor, a third resistor, and a fourth resistor , the first capacitor, the second capacitor, the third capacitor and the fourth capacitor; the inverting input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier, and is also connected to one end of the first resistor through the first capacitor; The positive input terminal of an operational amplifier is connected to one end of the first resistor through the second resistor, and grounded through the second capacitor, and the other end of the first resistor is connected to the output terminal of the digital-to-analog conversion circuit through the third resistor, and is also connected to the ground through the second capacitor. The three capacitors are grounded; the output terminal of the first operational amplifier is connected to the positive input terminal of the second operational amplifier, and the reverse input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier and one end of the fourth resistor. The other end of the fourth resistor is connected to the intensity adjustment circuit and grounded through the fourth capacitor. 6. The treatment waveform generating device according to claim 5, wherein the intensity adjustment circuit comprises a first digital potentiometer, a fifth resistor and a fifth capacitor; the first terminal of the first digital potentiometer passes through The fifth capacitor is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to the other end of the fourth resistor, the second end of the first digital potentiometer is connected to the first SPI circuit, and the third end of the first digital potentiometer is connected to the subtraction amplifying circuit. 7. The treatment waveform generating device according to claim 6, wherein the neutral line adjustment circuit includes a second digital potentiometer, the first end of the second digital potentiometer is connected to the power supply terminal, and the second digital potentiometer The second end of the second digital potentiometer is connected to the second SPI circuit, and the third end of the second digital potentiometer is connected to the subtraction amplifier circuit. 8. The treatment waveform generating device according to claim 7, characterized in that, the subtraction amplifier circuit comprises a third operational amplifier, a sixth resistor, a seventh resistor, an eighth resistor and a ninth resistor; The positive input terminal of the amplifier is connected to the third terminal of the first digital potentiometer through the sixth resistor, the positive input terminal of the third operational amplifier is also connected to the output terminal of the third operational amplifier through the seventh resistor, and the negative input terminal of the third operational amplifier The input terminal is connected to the third terminal of the second digital potentiometer through the eighth resistor, and grounded through the ninth resistor; the output terminal of the third operational amplifier is connected to the voltage-current conversion circuit. 9. The treatment waveform generating device according to claim 8, characterized in that, the voltage-current conversion circuit comprises a fourth operational amplifier, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor and a Fourteen resistors; the positive input end of the fourth operational amplifier is connected to one end of the tenth resistor and one end of the eleventh resistor, the other end of the tenth resistor is connected to the output terminal of the third operational amplifier, and the eleventh resistor The other end of the twelfth resistor is connected to one end of the twelfth resistor and the transformer amplifying circuit, the other end of the twelfth resistor is connected to the output end of the fourth operational amplifier, the inverting input end of the fourth operational amplifier is grounded through the thirteenth resistor, and also passed through the thirteenth resistor. The fourteen resistors are connected to the output terminal of the fourth operational amplifier. 10. The treatment waveform generating device according to claim 9, characterized in that, the transformer amplifying circuit comprises a transformer and a fifteenth resistor, and one end of the primary winding of the transformer is connected to the other end of the eleventh resistor and the twelfth resistor. One end of the resistor, the other end of the primary winding of the transformer is grounded, one end of the secondary winding of the transformer is connected to the shedding detection circuit and the electrode sheet A, the other end of the secondary winding of the transformer is connected to one end of the fifteenth resistor, and the other end of the fifteenth resistor is connected to Current detection circuit and electrode sheet B. 11. The treatment waveform generator according to claim 10, characterized in that, the shedding detection circuit comprises a first diode, a second diode, a third diode, a sixteenth resistor, a seventeenth resistor resistor and the eighteenth resistor; the anode of the first diode is connected to one end of the secondary winding of the transformer, and the cathode of the first diode is connected to one end of the seventeenth resistor and one end of the eighteenth resistor through the sixteenth resistor , the other end of the seventeenth resistor is grounded, the other end of the eighteenth resistor is connected to the anode of the second diode, the cathode of the third diode and the analog-to-digital conversion circuit, the cathode of the second diode Connect the power terminal, and the anode of the third diode is grounded. 12. The treatment waveform generating device according to claim 11, wherein the current detection circuit comprises a fifth operational amplifier, a sixth operational amplifier, a fourth diode, a nineteenth resistor, a twentieth resistor, The twenty-first resistor and the twenty-second resistor; the inverting input terminal of the fifth operational amplifier is connected to the negative pole of the fourth diode, one end of the twentieth resistor and the end of the twenty-first resistor through the nineteenth resistor One end, the anode of the fourth diode is grounded, the other end of the twentieth resistor is connected to the output of the fifth operational amplifier, the other end of the twenty-first resistor is connected to the other end of the fifteenth resistor and the electrode sheet B, The positive input terminal of the fifth operational amplifier is grounded through the twenty-second resistor, the output terminal of the fifth operational amplifier is connected to the positive input terminal of the sixth operational amplifier, and the negative input terminal of the sixth operational amplifier is connected to the sixth operational amplifier. The output of the amplifier and the analog-to-digital conversion circuit. 13. A medium-frequency electrical stimulation therapeutic apparatus, comprising a microprocessor, a first SPI circuit and a second SPI circuit, characterized in that, it also includes a treatment waveform generating device as claimed in any one of claims 1-12; the treatment The waveform generating device is connected to the microprocessor, the first SPI circuit and the second SPI circuit; The first SPI circuit is used to convert the input adjustment instruction, and output an adjustment signal to adjust the intensity of the treatment waveform output by the treatment waveform generating device; the second SPI circuit is used to convert the input control instruction, and output the SPI code to adjust the intensity of the treatment waveform. The positive and negative pressure of the treatment waveform; the microcontroller judges the voltage of the treatment waveform to identify the lead off state, and also calculates the current of the treatment waveform to obtain the real-time current flowing through the human body and feedback.