Electrical stimulation circuit, control method, device and therapeutic equipment thereof

Abstract

The present invention relates to an electrical stimulation circuit, a control method for an electrical stimulation circuit, a control device for an electrical stimulation circuit, and an electrical stimulation treatment device. An electrical stimulation circuit comprises: an electrical stimulation generating circuit, a detection circuit, and a control circuit; the control circuit is connected to the electrical stimulation generating circuit and the detection circuit, and the control circuit is used to control the electrical stimulation generating circuit to output electrical stimulation pulses to a load, and the amplitude of the electrical stimulation pulse current is equal to a preset current value; the detection circuit is also connected to the electrical stimulation generating circuit, and the detection circuit is used to detect the voltage value and current value output by the electrical stimulation generating circuit to the load; the control circuit is also used to obtain the impedance value of the load based on the voltage value and current value output by the electrical stimulation generating circuit to the load, and when the impedance value is not within the preset impedance range, control the electrical stimulation generating circuit to stop outputting electrical stimulation pulses to the load. The above-mentioned electrical stimulation circuit can protect the safety of patients in a timely manner and prevent patients from being pricked or burned.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an electrical stimulation circuit, a control method for an electrical stimulation circuit, a control device for an electrical stimulation circuit, and electrical stimulation treatment equipment. Background Art

[0002] Electrical stimulation therapy devices are suitable for treating various types of pain, muscle dysfunction, etc. Their mechanism of action is that the device outputs a specific pulse current that acts on the human body through electrodes.

[0003] The output of electrical stimulation can be divided into two modes: constant current output and constant voltage output. As the load of the electrical stimulation treatment device, the impedance of human skin and tissue (including contact impedance) varies over a wide range, and may be between several hundred ohms and infinity. If constant voltage is used to output electrical stimulation, it can be guaranteed that high voltage stimulation will not occur during the output process. However, during use, due to changes in impedance, the output current of the electrical stimulation may change, making the treatment feel uncomfortable, especially when the impedance becomes smaller, the current increases and may burn the skin. In order to ensure a fixed and controllable current output for different human load impedances, most traditional electrical stimulation treatment devices are constant current output types. However, the problem that follows is that in actual use, the electrode sheet often has poor contact with the skin, resulting in excessive impedance, or even the electrode sheet falls off, causing an open circuit, and a higher voltage will appear between the two electrode sheets. In this case, when the electrode sheet is pressed again to contact the skin, the higher voltage will cause an unexpected instantaneous large current to the human body, stinging the skin, and may also burn the skin if it occurs frequently.

[0004] In response to the problem of poor contact between the electrode and the skin in constant current output electrical stimulation therapy equipment, the currently commonly used electrode impedance detection method is to determine whether the stimulation electrode has fallen off through the open and closed loop states of the constant current feedback control. This judgment method is too simple and crude, and can only detect the situation when the electrode impedance is very large (or infinite). The actual situation is that when the electrode impedance increases to a certain extent, the feedback mechanism of the constant current control has caused a larger stimulation output voltage to be applied between the electrode and the skin to maintain the constant current characteristics. In addition, the increase in electrode impedance is generally accompanied by a decrease in the contact area between the stimulation electrode and the skin, which causes an increase in the current density flowing through the skin, causing a tingling sensation in the patient and even burns to the patient's skin. Summary of the Invention

[0005] Based on this, it is necessary to provide an electrical stimulation circuit, an electrical stimulation circuit control method, an electrical stimulation circuit control device and an electrical stimulation treatment device to address the problem that traditional technology can only detect situations when the electrode impedance is very large (or infinite), and when the electrode impedance increases to a certain extent, it has caused an increase in the current density flowing through the skin, thereby causing a tingling sensation in the patient and even causing skin burns.

[0006] An electrical stimulation circuit, comprising: an electrical stimulation generating circuit, a detection circuit, and a control circuit; the control circuit is connected to the electrical stimulation generating circuit and the detection circuit, and the control circuit is used to control the electrical stimulation generating circuit to output electrical stimulation pulses to a load, wherein the amplitude of the electrical stimulation pulse current is equal to a preset current value;

[0007] The detection circuit is also connected to the electrical stimulation generating circuit, and the detection circuit is used to detect the voltage value and current value output by the electrical stimulation generating circuit to the load;

[0008] The control circuit is also used to obtain the impedance value of the load based on the voltage value and current value output by the electrical stimulation generating circuit to the load, and when the impedance value is not within a preset impedance range, control the electrical stimulation generating circuit to stop outputting the electrical stimulation pulse to the load.

[0009] In one embodiment, the electrical stimulation generating circuit comprises:

[0010] An H-bridge module includes an upper arm left bridge unit, an upper arm right bridge unit, a lower arm left bridge unit, and a lower arm right bridge unit, which are connected to the control circuit and the load; the control circuit controls the upper arm left bridge unit and the lower arm right bridge unit to be turned on at the same time, or controls the upper arm right bridge unit and the lower arm left bridge unit to be turned on at the same time;

[0011] a voltage adjustment module connected to the control circuit, the upper arm left bridge unit, and the upper arm right bridge unit; the voltage adjustment module is used to provide a preset voltage to the upper arm left bridge unit and the upper arm right bridge unit according to a preset voltage value provided by the control circuit;

[0012] A constant current control module is connected to the control circuit, the detection circuit, the lower arm left bridge unit and the lower arm right bridge unit; the constant current control module is used to adjust the current value output by the H-bridge module to the load to be equal to the preset current value provided by the control circuit.

[0013] In one embodiment, the voltage adjustment module includes a first energy storage capacitor, a second energy storage capacitor, an inductor, a first transistor and a first diode; the anode of the first energy storage capacitor and one end of the inductor are both connected to a power supply, the other end of the inductor is connected to the anode of the first diode and the collector of the first transistor, the base of the first transistor is connected to the control circuit, the anode of the second energy storage capacitor is connected to the cathode of the first diode and the H-bridge module, and the cathode of the first energy storage capacitor, the emitter of the first transistor and the cathode of the second energy storage capacitor are all connected to the ground end.

[0014] In one embodiment, the constant current control module includes a first operational amplifier and a selection switch; the non-inverting input terminal of the first operational amplifier is connected to the control circuit, and the inverting input terminal of the first operational amplifier is connected to the detection circuit; the first electrical connection terminal of the selection switch is connected to the output terminal of the first operational amplifier and the control circuit, the second electrical connection terminal of the selection switch is connected to the lower arm left bridge unit, and the third electrical connection terminal of the selection switch is connected to the lower arm right bridge unit.

[0015] In one embodiment, the upper arm right bridge unit includes a second transistor and a fifth transistor, the emitter of the second transistor is connected to the voltage adjustment module, the collector of the second transistor is connected to the load, the base of the second transistor is connected to the collector of the fifth transistor, the emitter of the fifth transistor is connected to the ground terminal, and the base of the fifth transistor is connected to the control circuit;

[0016] The upper arm left bridge unit includes a third transistor and a fourth transistor, the emitter of the third transistor is connected to the voltage adjustment module, the collector of the third transistor is connected to the load, the base of the third transistor is connected to the collector of the fourth transistor, the emitter of the fourth transistor is connected to the ground terminal, and the base of the fourth transistor is connected to the control circuit;

[0017] The lower arm left bridge unit includes a sixth transistor, the collector of the sixth transistor is connected to the load, the emitter of the sixth transistor is connected to the ground terminal, and the base of the sixth transistor is connected to the second electrical connection terminal of the selection switch;

[0018] The lower arm right bridge unit includes a seventh transistor, the collector of the seventh transistor is connected to the load, the emitter of the seventh transistor is connected to the ground end, and the base of the seventh transistor is connected to the third electrical connection end of the selection switch.

[0019] In one embodiment, the detection circuit includes:

[0020] a first voltage detection module, one end of the first voltage detection module being connected between the upper arm left bridge unit and the lower arm left bridge unit, the other end of the first voltage detection module being connected to the control circuit, and the first voltage detection module being used to amplify or attenuate the voltage output by the H-bridge module to one end of the load;

[0021] a second voltage detection module, one end of the second voltage detection module being connected between the upper arm right bridge unit and the lower arm right bridge unit, the other end of the second voltage detection module being connected to the control circuit, and the second voltage detection module being used to amplify or attenuate the voltage output by the H-bridge module to the other end of the load;

[0022] a current sampling module, one end of which is connected to the lower arm left bridge unit, the lower arm right bridge unit, and the constant current control module, and the other end of which is connected to the ground terminal, and the current sampling module is used to collect the current value output by the H-bridge module to the load;

[0023] A current detection module, one end of which is connected to the current sampling module, and the other end of which is connected to the control circuit. The current detection module is used to amplify the current value collected by the current sampling module and output it to the control circuit.

[0024] In one embodiment, the first voltage detection module includes a second operational amplifier, a first voltage-dividing resistor, and a second voltage-dividing resistor; one end of the first voltage-dividing resistor and the second voltage-dividing resistor connected in series is connected between the upper arm left bridge unit and the lower arm left bridge unit, and the other end of the first voltage-dividing resistor and the second voltage-dividing resistor connected in series is connected to the ground end; the non-inverting input end of the second operational amplifier is connected between the first voltage-dividing resistor and the second voltage-dividing resistor, the inverting input end of the second operational amplifier is connected to the output end of the second operational amplifier, and the output end of the second operational amplifier is also connected to the control circuit.

[0025] In one embodiment, the second voltage detection module includes a third operational amplifier, a third voltage-dividing resistor and a fourth voltage-dividing resistor; one end of the third voltage-dividing resistor and the fourth voltage-dividing resistor connected in series is connected between the upper arm right bridge unit and the lower arm right bridge unit, and the other end of the third voltage-dividing resistor and the fourth voltage-dividing resistor connected in series is connected to the ground end; the inverting input end of the third operational amplifier is connected between the third voltage-dividing resistor and the fourth voltage-dividing resistor, the non-inverting input end of the third operational amplifier is connected to the output end of the third operational amplifier, and the output end of the third operational amplifier is also connected to the control circuit.

[0026] In one embodiment, the current detection module includes a fourth operational amplifier, a first amplifying resistor and a second amplifying resistor; the non-inverting input terminal of the fourth operational amplifier is connected to the current sampling module, the inverting input terminal of the fourth operational amplifier is connected to the ground terminal through the first amplifying resistor, the inverting input terminal of the fourth operational amplifier is also connected to the output terminal of the fourth operational amplifier through the second amplifying resistor, and the output terminal of the fourth operational amplifier is also connected to the control circuit.

[0027] An electrical stimulation therapy device comprises a first electrode sheet, a second electrode sheet and an electrical stimulation circuit as described above, wherein the electrical stimulation circuit outputs the electrical stimulation pulse to the load through the first electrode sheet and the second electrode sheet.

[0028] A method for controlling an electrical stimulation circuit, comprising:

[0029] Controlling the electrical stimulation circuit to output electrical stimulation pulses to the load; the amplitude of the electrical stimulation pulse current is equal to a preset current value;

[0030] Obtaining a voltage value and a current value outputted by the electrical stimulation circuit to the load, and obtaining an impedance value of the load according to the voltage value and the current value outputted by the electrical stimulation circuit to the load; and

[0031] When the impedance value of the load is not within a preset impedance range, the electrical stimulation circuit is controlled to stop outputting the electrical stimulation pulse to the load.

[0032] In one embodiment, the step of controlling the electrical stimulation circuit to output electrical stimulation pulses to the load includes:

[0033] outputting a preset pulse current to the patient; the amplitude of the preset pulse current is the preset current value;

[0034] Gradually increase the power supply voltage of the electrical stimulation circuit until the voltage value output by the electrical stimulation circuit to the load reaches a set voltage range.

[0035] In one embodiment, it further includes:

[0036] Obtaining a voltage value and a current value outputted by the electrical stimulation circuit to the load;

[0037] When either the voltage value output by the electrical stimulation circuit to the load is not within the set voltage range or the current value output by the electrical stimulation circuit to the load is inconsistent with the preset current value, the electrical stimulation circuit is controlled to stop outputting the electrical stimulation pulse to the load.

[0038] In one embodiment, after the step of controlling the electrical stimulation circuit to output electrical stimulation pulses to the load, the method further includes:

[0039] receiving adjustment commands;

[0040] When the adjustment command is to increase the current amplitude of the electrical stimulation pulse, the preset pulse current output to the patient is adjusted, the amplitude of the adjusted preset pulse current is the adjusted preset current value, and the power supply voltage of the electrical stimulation circuit is increased until the voltage output by the electrical stimulation circuit to the load reaches the adjusted preset voltage range;

[0041] When the adjustment command is to reduce the current amplitude of the electrical stimulation pulse, the preset pulse current output to the patient is adjusted, the amplitude of the adjusted preset pulse current is the adjusted preset current value, and the power supply voltage of the electrical stimulation circuit is reduced until the voltage output by the electrical stimulation circuit to the load reaches the adjusted preset voltage range.

[0042] In one embodiment, before the step of controlling the electrical stimulation circuit to output electrical stimulation pulses to the load, the method further comprises:

[0043] outputting a test electrical stimulation pulse to the load;

[0044] Obtaining a voltage value and a current value outputted by the electrical stimulation circuit to the load, and obtaining an impedance value of the load according to the voltage value and the current value outputted by the electrical stimulation circuit to the load; and

[0045] When the impedance value of the load is not within a preset impedance range, the electrical stimulation circuit is controlled to stop outputting the test electrical stimulation pulse to the load.

[0046] In one embodiment, the preset impedance range includes an upper impedance limit and a lower impedance limit; and the control method of the electrical stimulation circuit further includes:

[0047] When the impedance value of the patient exceeds the impedance upper limit, it indicates that the load contact is poor;

[0048] When the impedance value of the patient is lower than the impedance lower limit, it indicates that the load is short-circuited.

[0049] A control device for an electrical stimulation circuit, comprising:

[0050] A control module, configured to control the electrical stimulation circuit to output electrical stimulation pulses to the load; the amplitude of the electrical stimulation pulse current is equal to a preset current value;

[0051] an acquisition module, configured to acquire a voltage value and a current value outputted by the electrical stimulation circuit to the load, and obtain an impedance value of the load according to the voltage value and the current value outputted by the electrical stimulation circuit to the load; and

[0052] The control module is further configured to control the electrical stimulation circuit to stop outputting the electrical stimulation pulse to the load when the impedance value of the load is not within a preset impedance range.

[0053] The above-mentioned electrical stimulation circuit, electrical stimulation circuit control method, electrical stimulation circuit control device, and electrical stimulation treatment equipment calculate the impedance value of the patient's load by detecting the voltage and current values ​​output by the electrical stimulation circuit to the patient's load in real time. Once the patient's impedance value is not within the preset impedance range, the electrical stimulation circuit is controlled to stop outputting electrical stimulation pulses to the patient, thereby protecting the patient's safety in a timely manner and preventing the patient from being pricked or burned. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 Flowchart of a control method of an electrical stimulation circuit in one embodiment.

[0055] Figure 2 Flowchart of a control method of an electrical stimulation circuit in another embodiment.

[0056] Figure 3 4 is a structural block diagram of an electrical stimulation circuit in one embodiment.

[0057] Figure 4 2 is a structural block diagram of an electrical stimulation circuit in another embodiment.

[0058] Figure 5 FIG. 4 is a circuit diagram of a voltage adjustment module in an embodiment.

[0059] Figure 6 FIG. 4 is a circuit diagram of a constant current control module in one embodiment.

[0060] Figure 7 FIG. 4 is a circuit diagram of an H-bridge module in one embodiment.

[0061] Figure 8 FIG. 4 is a circuit diagram of a first voltage detection module in an embodiment.

[0062] Figure 9 FIG. 4 is a circuit diagram of a second voltage detection module in one embodiment.

[0063] Figure 10 FIG. 4 is a circuit diagram of a current detection module in an embodiment.

[0064] Figure 11 4 is a structural block diagram of a control device for an electrical stimulation circuit in one embodiment.

[0065] Figure 12 4 is a structural block diagram of a computer device in one embodiment.

[0066] Description of reference numerals:

[0067] 110. Electrical stimulation generating circuit; 120. Detection circuit; 130. Control circuit; 111. H-bridge module; 112. Voltage adjustment module; 113. Constant current control module; 111a. Upper arm left bridge unit; 111b. Upper arm right bridge unit; 111c. Lower arm left bridge unit; 111d. Lower arm right bridge unit; 121. First voltage detection module; 122. Second voltage detection module; 123. Current sampling module; 124. Current detection module; 140. Load; 210. Control module; 220. Acquisition module. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0069] Figure 1 FIG. 1 is a flow chart of a method for controlling an electrical stimulation circuit in one embodiment. Figure 1 As shown, the control method of the electrical stimulation circuit includes the following steps:

[0070] Step S120: Control the electrical stimulation circuit to output electrical stimulation pulses to the load.

[0071] Specifically, the control method of the electrical stimulation circuit provided in this embodiment can be completed based on any electrical stimulation circuit that can implement the above steps. Electrical stimulation pulses are generated by the electrical stimulation circuit and output to the load. The load can be a human body or any other biological body that needs to be treated with electrical stimulation pulses. For example, the output end of the electrical stimulation circuit is provided with at least two electrode sheets, and these two electrode sheets are connected to the patient. They can be attached to the surface of the patient's skin or implanted in the patient's body, and the electrical stimulation circuit is controlled to output electrical stimulation pulses to the patient through the electrode sheets. Parameters of the electrical stimulation pulses, such as current amplitude, voltage amplitude, and frequency, can be set according to treatment requirements. In this embodiment, the current amplitude of the electrical stimulation pulse, that is, the current value output by the electrical stimulation circuit to the patient, is equal to the preset current value, thereby achieving constant current output.

[0072] Step S131, obtaining the voltage value and current value output by the electrical stimulation circuit to the load, and obtaining the impedance value of the load based on the voltage value and current value output by the electrical stimulation circuit to the load.

[0073] Specifically, in the process of outputting electrical stimulation pulses to the patient load, the current value and voltage value output by the electrical stimulation circuit to the load are detected in real time, and the quotient of the voltage value output by the electrical stimulation circuit to the load divided by the current value output by the electrical stimulation circuit to the load is calculated, that is, the impedance value of the patient load.

[0074] Step S131 , determining whether the impedance value of the load is within a preset impedance range.

[0075] Step S140: Control the electrical stimulation circuit to stop outputting electrical stimulation pulses to the load.

[0076] Specifically, the preset impedance range can be set according to demand. For example, it can be set according to the standard impedance value of the patient's treatment part. When the impedance value of the load is within the preset impedance range, it indicates that the connection between the electrical stimulation circuit and the load is normal, and the electrical stimulation circuit can be controlled to continue to output electrical stimulation pulses to the load; when the impedance value of the load is not within the preset impedance range, it indicates that the connection between the electrical stimulation circuit and the load is abnormal. When the patient is given electrical stimulation treatment, the abnormal connection between the electrical stimulation circuit and the patient can easily cause stinging or even burns to the patient's skin. At this time, the electrical stimulation circuit is controlled to stop outputting electrical stimulation pulses to the load to ensure the safety of the patient.

[0077] The control method of the above-mentioned electrical stimulation circuit calculates the impedance value of the patient's load by detecting the voltage and current values ​​output by the electrical stimulation circuit to the patient's load in real time. Once the impedance value of the patient's load is not within the preset impedance range, the electrical stimulation circuit is controlled to stop outputting electrical stimulation pulses to the patient, thereby protecting the patient's safety in time and preventing the patient from being pricked or burned.

[0078] Figure 2 A control method for an electrical stimulation circuit in another embodiment is as follows: Figure 2 As shown, the control method of the electrical stimulation circuit further includes executing steps S111 to S114 before executing step S120.

[0079] Step S111: controlling the electrical stimulation circuit to output a test electrical stimulation pulse to the load.

[0080] Specifically, the electrical stimulation circuit is controlled to output a test electrical stimulation pulse to the patient. The current amplitude of the test electrical stimulation pulse, i.e., the current value output by the electrical stimulation circuit to the load, can be a smaller value lower than the standard current so as not to cause a human reaction. Furthermore, the voltage value output by the electrical stimulation circuit to the load can also be controlled to be a smaller voltage value that does not cause a human reaction. The frequency and pulse width of the test electrical stimulation pulse can be the test frequency and test pulse width, respectively.

[0081] Step S112, obtaining the voltage value and current value output by the electrical stimulation circuit to the load, and obtaining the impedance value of the load based on the voltage value and current value output by the electrical stimulation circuit to the load.

[0082] Step S113: determining whether the impedance value of the load is within a preset impedance range.

[0083] Step S114: controlling the electrical stimulation circuit to stop outputting the test electrical stimulation pulse to the load.

[0084] Specifically, step S112 is the same as or similar to step S131, and step S113 is the same as or similar to step S132. When the impedance value of the load is not within the preset impedance range, it indicates that the connection between the load and the electrical stimulation circuit is abnormal. At this time, the electrical stimulation circuit is controlled to stop outputting test electrical stimulation pulses to the patient. The doctor or technician can check the connection between the electrical stimulation circuit and the patient, and reconnect the electrical stimulation circuit to the patient. After that, the electrical stimulation circuit can continue to be controlled to output test stimulation pulses to the patient until it is determined that the impedance value of the load is within the preset range, and then the electrical stimulation circuit is controlled to output electrical stimulation pulses for treatment to the patient. In this embodiment, a test electrical stimulation pulse is first used to test the patient before outputting the electrical stimulation pulse for treatment. Since the various parameters of the test electrical stimulation pulse are based on not causing any reaction in the human body, the patient's safety can be guaranteed even if the connection between the electrical stimulation circuit and the patient's load is abnormal.

[0085] In one embodiment, step S120 of controlling the electrical stimulation circuit to output electrical stimulation pulses to the load specifically includes steps S121 and S122.

[0086] Step S121, controlling the electrical stimulation circuit to output a preset pulse current to the load.

[0087] Step S122, gradually increasing the power supply voltage of the electrical stimulation circuit until the voltage value output by the electrical stimulation circuit to the load reaches a set voltage range.

[0088] Specifically, after testing to determine that the connection between the electrical stimulation circuit and the patient is normal, the electrical stimulation circuit can be controlled to output a preset pulse current to the patient, wherein the amplitude of the preset pulse current is a preset current value, and the frequency and pulse width of the preset pulse current can be preset frequencies and preset pulse widths, respectively. Furthermore, the power supply voltage of the electrical stimulation circuit is gradually increased until the voltage output by the electrical stimulation circuit to the load reaches a set voltage range. In this embodiment, during the normal output of electrical stimulation pulses to the patient, a constant current output is maintained, the current amplitude is a preset current value, and the maximum output voltage is limited to a set voltage range. Electrical stimulation pulses are output to the patient under constant current and constant voltage, thereby ensuring the therapeutic effect on the patient while avoiding discomfort caused by changes in the impedance value of the patient's load.

[0089] In one embodiment, after step S120, the following steps may be further included:

[0090] Step S151: receiving an adjustment command.

[0091] Specifically, after step S120, the voltage across the patient's load applied by the electrical stimulation circuit is within a set voltage range, and the current across the patient's load applied by the electrical stimulation circuit is a preset current value. The adjustment command may include increasing the intensity of the electrical stimulation pulses delivered to the patient, in which case both the current and voltage delivered by the electrical stimulation circuit to the patient's load need to be increased accordingly; the adjustment command may also include decreasing the intensity of the electrical stimulation pulses delivered to the patient, in which case both the current and voltage delivered by the electrical stimulation circuit to the patient need to be decreased accordingly.

[0092] Step S152, when the adjustment command is to increase the intensity of the electrical stimulation pulse, adjust the preset pulse current output to the load, the amplitude of the adjusted preset pulse current is the increased preset current value, and increase the power supply voltage of the electrical stimulation circuit until the voltage output by the electrical stimulation circuit to the load reaches the increased set voltage range.

[0093] Step S153, when the adjustment command is to reduce the intensity of the electrical stimulation pulse, the preset pulse current output to the load is adjusted, the amplitude of the adjusted preset pulse current is the reduced preset current value, and the power supply voltage of the electrical stimulation circuit is reduced until the voltage output by the electrical stimulation circuit to the load reaches the reduced set voltage range.

[0094] In this embodiment, the adjustment command can be input to the electrical stimulation circuit through the input device. After receiving the adjustment command, the electrical stimulation circuit adjusts the voltage and current values ​​output to the patient load according to the command content, thereby adjusting the intensity of the electrical stimulation pulse loaded to the patient.

[0095] In one embodiment, steps S133 to S135 may be further included after step S120.

[0096] Step S133, obtaining the voltage value and current value output by the electrical stimulation circuit to the load.

[0097] Step S134, determining whether the voltage value output by the electrical stimulation circuit to the load is within a set voltage range.

[0098] Step S135, determining whether the current value output by the electrical stimulation circuit to the load is consistent with the preset current value.

[0099] When either the voltage value output by the electrical stimulation circuit to the load is not within the set voltage range or the current value output by the electrical stimulation circuit to the load is inconsistent with the preset current value, execute step S140 to control the electrical stimulation circuit to stop outputting electrical stimulation pulses to the load.

[0100] Specifically, a voltage detection circuit and a current detection circuit can be set to respectively detect the voltage value and current value output by the electrical stimulation circuit to the load. After step S120, when the connection between the electrical stimulation circuit and the patient load is normal, the voltage value output by the electrical stimulation circuit to the patient load should be maintained within the set voltage range, and the current value output by the electrical stimulation circuit to the patient load should be maintained at the preset current value. In this embodiment, based on the comparison and judgment of the voltage value output by the electrical stimulation circuit to the patient load with the set voltage range and the comparison and judgment of the current value output by the electrical stimulation circuit to the patient load with the preset current value, it is possible to timely detect whether a fault occurs inside the electrical stimulation circuit, thereby ensuring the safety of the patient.

[0101] In one embodiment, the above-mentioned step S113 of controlling the electrical stimulation circuit to stop outputting the test electrical stimulation pulse to the load when the impedance value of the load is not within the preset impedance range and / or step S160 of controlling the electrical stimulation circuit to stop outputting the electrical stimulation pulse to the load when the impedance value of the load is not within the preset impedance range may further include the following steps:

[0102] When the impedance value of the load exceeds the upper impedance limit, it indicates that the load has poor contact.

[0103] When the load impedance value is lower than the lower impedance limit, it indicates that the load is short-circuited.

[0104] Specifically, an alarm device can be set up, and different alarm forms of the alarm device can be used to indicate load contact failure and load short circuit. For example, a flashing red light can be set to indicate poor load contact, and a flashing yellow light can be set to indicate load short circuit. Alternatively, a voice alarm device can be used to indicate poor load contact and load short circuit, or a text display can be used to indicate.

[0105] It should be noted that the steps in the above embodiments are not limited to the following Figure 1 and attached Figure 2 The implementation order, for example, step S131, step S132 and step S140 can be performed at the same time as any step is performed. For example, step S133 to step S140 can also be performed after executing step S152 or S153.

[0106] The present application also provides an electrical stimulation circuit, and the control method of the above-mentioned electrical stimulation circuit can be implemented by the electrical stimulation circuit. Figure 3As shown, the electrical stimulation circuit includes an electrical stimulation generating circuit 110, a detection circuit 120, and a control circuit 130. The control circuit 130 is connected to the electrical stimulation generating circuit 110 and the detection circuit 120. The control circuit 130 is used to control the electrical stimulation generating circuit 110 to output electrical stimulation pulses to the load 140. The detection circuit 120 is also connected to the electrical stimulation generating circuit 110. The detection circuit 120 is used to detect the voltage and current values ​​output by the electrical stimulation generating circuit 110 to the load 140. The control circuit 130 is further used to obtain the impedance value of the load 140 based on the voltage and current values ​​output by the electrical stimulation generating circuit 110 to the load 140, and to control the electrical stimulation generating circuit 110 to stop outputting electrical stimulation pulses to the load 140 when the impedance value of the load 140 is not within a preset impedance range.

[0107] Specifically, the load 140 can be a human body load 140, and the output end of the electrical stimulation generating circuit 110 can be connected to the patient through at least two electrode sheets. The electrode sheets can be attached to the patient's skin surface or implanted in the patient's body. The electrical stimulation generating circuit 110 outputs electrical stimulation pulses to the patient through the electrode sheets to perform electrical stimulation treatment on the patient. Parameters of the electrical stimulation pulses, such as current amplitude, voltage amplitude, and frequency, can be set according to treatment requirements. In this embodiment, the current amplitude of the electrical stimulation pulse, that is, the current value output by the electrical stimulation generating circuit 110 to the patient, is equal to the preset current value, thereby achieving constant current output. Optionally, the control circuit 130 can control the electrical stimulation generating circuit 110 to output bidirectional constant current pulses to the patient.

[0108] The detection circuit 120 is also connected to the electrical stimulation generating circuit 110. The detection circuit 120 is used to detect the voltage and current values ​​output by the electrical stimulation generating circuit 110 to the patient load 140 and output them to the control circuit 130, so that the control circuit 130 calculates the impedance value of the patient load 140 based on the current and voltage values. For example, the electrical stimulation generating circuit 110 includes a first output terminal and a second output terminal, and these two output terminals are connected to the patient through two electrode sheets. The detection circuit 120 respectively detects the voltage value V1 of the first output terminal and the voltage value V2 of the second output terminal, as well as the current value I flowing through the patient. The impedance value of the patient connected between the two electrode sheets is the absolute value of the difference between V1 and V2 divided by I.

[0109] Next, the control circuit 130 determines whether the impedance value is within a preset impedance range. If not, the control circuit 130 controls the electrical stimulation generating circuit 110 to stop outputting electrical stimulation pulses to the load 140. The preset impedance range can be determined based on the standard impedance value of the patient's treatment site, i.e., the site connected between the two electrode pads. If the impedance value of the patient's load 140 is determined to be outside the preset impedance range, it indicates that the connection between the electrical stimulation generating circuit 110 and the patient is abnormal. In this case, stopping the output of electrical stimulation pulses to the patient is beneficial to ensure the patient's safety and avoid stinging or burns during treatment.

[0110] The above-mentioned electrical stimulation circuit calculates the impedance value of the patient load 140 by detecting the voltage and current values ​​output to the patient by the electrical stimulation generating circuit 110 in real time. Once the patient's impedance value is not within the preset impedance range, the electrical stimulation generating circuit 110 is controlled to stop outputting electrical stimulation pulses to the patient, thereby protecting the patient's safety in time and preventing the patient from being pricked or burned.

[0111] Figure 4 FIG. 1 is a structural block diagram of an electrical stimulation circuit in another embodiment. Figure 4 As shown, the electrical stimulation generating circuit 110 includes an H-bridge module 111 , a voltage adjustment module 112 and a constant current control module 113 .

[0112] The H-bridge module 111 includes an upper left bridge unit 111a, an upper right bridge unit 111b, a lower left bridge unit 111c, and a lower right bridge unit 111d, which are connected to a control circuit 130 and a load 140. The control circuit 130 controls the upper left bridge unit 111a and the lower right bridge unit 111d to be turned on simultaneously, or controls the upper right bridge unit 111b and the lower left bridge unit 111c to be turned on simultaneously. In this embodiment, the control circuit 130 can control the upper arm left bridge unit 111a and the lower arm right bridge unit 111d to be turned on at the same time, and control the upper arm right bridge unit 111b and the lower arm left bridge unit 111c to be turned on at the same time, in turn, according to a preset pulse width and a preset frequency, so that the current flows through the upper arm left bridge unit 111a, the patient load 140 and the lower arm right bridge unit 111d in sequence, or the current flows through the upper arm right bridge unit 111b, the patient load 140 and the lower arm left bridge unit 111c in sequence, so as to output a bidirectional constant current electrical stimulation pulse to the patient load 140.

[0113] It should be noted that when the upper arm left bridge unit 111a and the lower arm right bridge unit 111d are turned on, the control circuit 130 needs to control the upper arm right bridge unit 111b and the lower arm left bridge unit 111c to be turned off; when the upper arm right bridge unit 111b and the lower arm left bridge unit 111c are turned on, the control circuit 130 needs to control the upper arm left bridge unit 111a and the lower arm right bridge unit 111d to be turned off.

[0114] Constant current control module 113 is connected to control circuit 130, detection circuit 120, lower arm left bridge unit 111c, and lower arm right bridge unit 111d. Constant current control module 113 is used to adjust the current value output by H-bridge module 111 to patient load 140 to be equal to the preset current value provided by control circuit 130, that is, to achieve constant current output by H-bridge module 111.

[0115] The voltage adjustment module 112 is connected to the control circuit 130, the upper arm left bridge unit 111a, and the upper arm right bridge unit 111b. The voltage adjustment module 112 is configured to provide a preset voltage to the upper arm left bridge unit 111a and the upper arm right bridge unit 111b based on a preset voltage value provided by the control circuit 130. The voltage adjustment module 112 can adjust the power supply voltage based on the preset voltage value provided by the control circuit 130, including stepping up or down the power supply voltage, so as to provide the preset voltage to the H-bridge module 111, so that the voltage output by the H-bridge module 111 to the patient reaches and remains within a set voltage range. It should be noted that the set voltage range may not be equal to the preset voltage value.

[0116] In this embodiment, the constant current control module 113 is used to control the H-bridge circuit to maintain a constant current output during the output of electrical stimulation pulses, and the current value is a preset current value. The voltage adjustment module 112 is used to limit the output voltage range of the H-bridge circuit to a set voltage range, that is, electrical stimulation pulses are output to the patient under constant current and constant voltage, so that while ensuring the therapeutic effect on the patient, the discomfort of treatment caused by changes in the patient load 140 is avoided.

[0117] In one embodiment, still see Figure 4The detection circuit 120 includes a first voltage detection module 121, a second voltage detection module 122, a current sampling module 123, and a current detection module 124. One end of the first voltage detection module 121 is connected between the upper arm left bridge unit 111a and the lower arm left bridge unit 111c, and the other end of the first voltage detection module 121 is connected to the control circuit 130. The first voltage detection module 121 is configured to amplify or attenuate the voltage output by the H-bridge module 111 to one end of the load 140 and output it to the control circuit 130. One end of the second voltage detection module 122 is connected between the upper arm right bridge unit 111b and the lower arm right bridge unit 111d, and the other end of the second voltage detection module 122 is connected to the control circuit 130. The second voltage detection module 122 is configured to amplify or attenuate the voltage output by the H-bridge module 111 to the other end of the load 140 and output it to the control circuit 130. It is understood that, for example, when the electrical stimulation circuit is connected to a patient via two electrodes to provide electrical stimulation therapy to the patient, the first voltage detection module 121 detects the voltage output from one of the electrodes, and the second voltage detection module 122 detects the voltage output from the other electrode. The amplification factor or attenuation of the first voltage detection module 121 and the second voltage detection module 122 can be set as needed. The control circuit 130 only needs to calculate the absolute value of the difference between the voltage value detected by the first voltage detection module 121 and the voltage value detected by the second voltage detection module 122 to obtain the voltage value output to the patient by the H-bridge module 111.

[0118] One end of the current sampling module 123 is connected to the lower arm left bridge unit 111c, the lower arm right bridge unit 111d, and the constant current control module 113, and the other end of the current sampling module 123 is connected to the ground terminal. The current sampling module 123 is used to collect the current value output by the H-bridge module 111 to the load 140. Exemplarily, the current sampling module 123 can be a sampling resistor R7. The lower arm left bridge unit 111c is grounded through the sampling resistor R7, and the lower arm right bridge unit 111d is grounded through the sampling resistor R7. Because the sampling resistor R7 is connected in series with the branch where the patient load 140 is located, the voltage value corresponding to the current output by the H-bridge module 111 to the patient load 140 can be collected and fed back to the constant current control module 113 and the current detection module 124. One end of the current detection module 124 is connected to the current sampling module 123, and the other end of the current detection module 124 is connected to the control circuit 130. The current detection module 124 is used to amplify the current value collected by the current sampling module 123 and output it to the control circuit 130.

[0119] Figure 5 FIG. 1 is a circuit diagram of a voltage adjustment module in an embodiment. The voltage adjustment module 112 in this embodiment includes a BOOST boost circuit. Figure 5As shown, the voltage adjustment module 112 includes a first energy storage capacitor C1, a second energy storage capacitor C2, an inductor L1, a first transistor Q1, and a first diode D1. The first transistor Q1 can be an NPN transistor. The anode of the first energy storage capacitor C1 and one end of the first inductor L1 are both connected to a power supply (not shown), the other end of the inductor L1 is connected to the anode of the first diode D1 and the collector of the first transistor Q1, the base of the first transistor Q1 is connected to the control circuit 130, the anode of the second energy storage capacitor C2 is connected to the cathode of the first diode D1 and the H-bridge module 111, and the cathode of the first energy storage capacitor C1, the emitter of the first transistor Q1, and the cathode of the second energy storage capacitor C2 are all connected to the ground terminal.

[0120] According to the PWM signal, for example, output by the control circuit 130 to the first transistor Q1 , the voltage regulating circuit is controlled to boost the power voltage DC to output a voltage V_STIM to the H-bridge circuit.

[0121] Figure 6 FIG. 1 is a circuit diagram of a constant current control module in an embodiment. Figure 6 As shown, the constant current control module 113 includes a first operational amplifier U1 and a selection switch S1. The non-inverting input terminal of the first operational amplifier U1 is connected to the control circuit 130, and the inverting input terminal of the first operational amplifier U2 is connected to the detection circuit 120. The first electrical connection terminal A of the selection switch S1 is connected to the output terminal of the first operational amplifier U1 and the control circuit 130, the second electrical connection terminal B of the selection switch S1 is connected to the lower arm left bridge unit 111c, and the third electrical connection terminal C of the selection switch is connected to the lower arm right bridge unit 111d.

[0122] The control circuit 130 inputs a preset current value I_OUT_DA to the non-inverting input terminal of the first operational amplifier U1. The detection circuit 120 inputs the current value I_DET flowing through the patient load 140 to the inverting input terminal of the first operational amplifier U2. The first operational amplifier U2 outputs a comparison signal of these two current values ​​to the first electrical connection terminal A of the selector switch S1. The control circuit 130's control signal L_SEL controls whether the comparison signal is output to the second electrical connection terminal B or the third electrical connection terminal C, thereby controlling the conductivity of the lower arm left bridge unit 111c or the conductivity of the lower arm right bridge unit 111d.

[0123] Figure 7 FIG. 1 is a circuit diagram of an H-bridge module in one embodiment. Figure 7As shown, the upper arm right bridge unit 111b includes a second transistor Q2 and a fifth transistor Q5. The emitter of the second transistor Q2 is connected to the voltage adjustment module 112, the collector of the second transistor Q2 is connected to the load 140, the base of the second transistor Q2 is connected to the collector of the fifth transistor Q5, the emitter of the fifth transistor Q5 is connected to the ground terminal, and the base of the fifth transistor Q5 is connected to the control circuit 130.

[0124] The upper arm left bridge unit 111a includes a third transistor Q3 and a fourth transistor Q4. The emitter of the third transistor Q3 is connected to the voltage adjustment module 112, the collector of the third transistor Q3 is connected to the load 140, the base of the third transistor Q3 is connected to the collector of the fourth transistor Q4, the emitter of the fourth transistor Q4 is connected to the ground terminal, and the base of the fourth transistor Q4 is connected to the control circuit 130.

[0125] The lower arm left bridge unit 111 c includes a sixth transistor Q6 , wherein the collector of the sixth transistor Q6 is connected to the load 140 , the emitter of the sixth transistor Q6 is connected to the ground terminal, and the base of the sixth transistor Q6 is connected to the second electrical connection terminal B of the selection switch S1 ;

[0126] The lower arm right bridge unit 111 d includes a seventh transistor Q7 , a collector of which is connected to the load 140 , an emitter of which is connected to the ground terminal, and a base of which is connected to the third electrical connection terminal C of the selection switch S1 .

[0127] Exemplarily, the second transistor Q2 and the third transistor Q3 may be bipolar PNP transistors, and the sixth transistor Q6 and the seventh transistor Q7 may be bipolar NPN transistors.

[0128] Figure 8 FIG. 1 is a circuit diagram of a first voltage detection module in an embodiment. Figure 8 As shown, the first voltage detection module 121 includes a second operational amplifier U2, a first voltage-dividing resistor R1, and a second voltage-dividing resistor R2. One end of the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 connected in series is connected between the upper arm left bridge unit 111a and the lower arm left bridge unit 111c, that is, connected to one end of the patient load 140, and the other end of the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 connected in series is connected to the ground terminal. The non-inverting input terminal of the second operational amplifier U2 is connected between the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2, and the inverting input terminal of the second operational amplifier U2 is connected to the output terminal of the second operational amplifier U2. The output terminal of the second operational amplifier U2 is also connected to the control circuit 130.

[0129] The voltage CH+ at one end of the load 140 (the voltage output by one of the electrode sheets) is sampled by the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 and output to the non-inverting input end of the second operational amplifier U2. After amplification or attenuation by the second operational amplifier U2, a first voltage sampling signal CH+_AD is obtained and output to the control circuit 130.

[0130] Figure 9 FIG. 1 is a circuit diagram of a second voltage detection module in one embodiment. Figure 9 As shown, the second voltage detection module 122 includes a third operational amplifier U3, a third voltage-dividing resistor R3, and a fourth voltage-dividing resistor R4. One end of the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 connected in series is connected between the upper arm right bridge unit 111b and the lower arm right bridge unit 111d, and the other end of the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 connected in series is connected to the ground terminal. The inverting input terminal of the third operational amplifier U3 is connected between the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4, the non-inverting input terminal of the third operational amplifier U3 is connected to the output terminal of the third operational amplifier U3, and the output terminal of the third operational amplifier U3 is also connected to the control circuit 130.

[0131] The voltage CH- at the other end of the load 140 (the voltage output by the other electrode sheet) is sampled by the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 and output to the inverting input end of the third operational amplifier U3. After amplification or attenuation by the third operational amplifier U3, a second voltage sampling signal CH-_AD is obtained and output to the control circuit 130.

[0132] Figure 10 FIG. 1 is a circuit diagram of a current detection module in an embodiment. Figure 10 As shown, the current detection module 124 includes a fourth operational amplifier U4, a first amplifying resistor R5, and a second amplifying resistor R6. The non-inverting input terminal of the fourth operational amplifier U4 is connected to the current sampling module 123, the inverting input terminal of the fourth operational amplifier U4 is connected to the ground terminal through the first amplifying resistor R5, and the inverting input terminal of the fourth operational amplifier U4 is also connected to the output terminal of the fourth operational amplifier U4 through the second amplifying resistor R6. The output terminal of the fourth operational amplifier U4 is also connected to the control circuit 130.

[0133] Please also refer to Figure 7 and Figure 10 The current sampling module 123 includes a sampling resistor R7, which uses the sampling resistor R7 to sample the current I_DET output by the H-bridge module 111 to the patient load 140, and then passes through Figure 10 The current detection module 124 amplifies the current and finally outputs the current sampling signal I_AD to the control circuit 130 .

[0134] In one embodiment, the specific working process of the electrical stimulation circuit is as follows:

[0135] After receiving the electrical stimulation output request, the control circuit 130 controls the electrical stimulation generating circuit 110 to output a test electrical stimulation pulse to the patient. Specifically, the control circuit 130 first outputs a voltage value corresponding to a test current to the constant current control module 113 through PWM or DAC. The output current value corresponding to this voltage value is small, so as not to cause a human body reaction. At the same time, the control circuit 130 controls the voltage adjustment module 112 to output a test voltage to the electrical stimulation generating circuit 110 through PWM or DAC, and the control circuit 130 also switches and closes the output of the bridge arm in the H-bridge module 111 in turn according to the test frequency and test pulse width. When the control is to turn on the upper arm left bridge unit 111a and enable the constant current control module 113 and the lower arm right bridge unit 111d, and disconnect the upper arm right bridge unit 111b and disable the constant current control module 113 and the lower arm left bridge unit 111c, the control circuit 130 performs AD sampling on the first voltage detection module 121, the second voltage detection module 122 and the current detection module 124 at the same time or according to a preset delay time to obtain the voltage value and current value loaded on the patient load 140 in this direction.

[0136] When the control circuit 130 controls the connection between the upper arm right bridge unit 111b and the enabled constant current control module 113 and the lower arm left bridge unit 111c, and disconnects the upper arm left bridge unit 111a and the disabled constant current control module 113 from the lower arm right bridge unit 111d, the control circuit 130 performs AD sampling on the first voltage detection module 121, the second voltage detection module 122, and the current detection module 124 at the same time or after a preset delay time to obtain the voltage and current values ​​in that direction loaded on the patient load 140. Of course, only unidirectional output voltage detection can also be performed.

[0137] The control circuit 130 calculates the impedance value of the patient load 140 based on the current loaded on the patient load 140 and the voltage across its two ends obtained by AD sampling, and determines whether the impedance value is within a preset impedance range. When calculating the impedance value of the patient load 140, multiple calculations are performed to obtain a more accurate impedance value of the patient load 140, for example, taking the average value of the impedance values ​​of the load 140 calculated multiple times. When the calculated impedance value is not within the preset impedance range, the control circuit 130 controls the H-bridge module 111 to stop outputting the test electrical stimulation pulse to the patient. Optionally, if the impedance value of the patient load 140 exceeds the preset impedance range, it indicates that the load 140 has poor contact. If the impedance value of the patient load 140 is lower than the preset impedance range, it indicates that the load 140 is short-circuited.

[0138] At this time, the doctor or technician promptly detects and maintains the connection between the electrical stimulation circuit and the patient. Afterwards, the control circuit 130 continues to control the electrical stimulation generating circuit 110 to output test electrical stimulation pulses to the patient until it is determined that the impedance value of the patient load 140 is within the preset impedance range. Afterwards, the control circuit 130 controls the H-bridge module 111 to output electrical stimulation pulses for treatment to the patient.

[0139] The specific process of the control circuit 130 controlling the H-bridge module 111 to output electrical stimulation pulses for treatment to the patient is as follows:

[0140] The control circuit 130 outputs the corresponding voltage value of the preset current value I_OUT_DA to the constant current control module 113 through PWM or DAC. At the same time, the control circuit 130 switches and closes the bridge arm output in the H-bridge module 111 in turn according to the received frequency pulse width (the frequency and pulse width are the frequency and pulse width of the electrical stimulation pulse used for treatment). When the control turns on the upper arm left bridge unit 111a and enables the connection between the constant current control module 113 and the lower arm right bridge unit 111d, and disconnects the upper arm right bridge unit 111b and disables the connection between the constant current control module 113 and the lower arm left bridge unit 111c, the control circuit 130 performs AD sampling on the second voltage detection module 122 at the same time or according to the preset delay time to obtain the voltage drop of the lower arm right bridge unit 111d in this direction. When the control is to turn on the upper arm right bridge unit 111b and enable the connection between the constant current control module 113 and the lower arm left bridge unit 111c, and disconnect the upper arm left bridge unit 111a and disable the constant current control module 113 from the lower arm right bridge unit 111d, the control circuit 130 performs AD sampling on the first voltage detection module 121 at the same time or according to a preset delay time to obtain the voltage drop of the lower arm left bridge unit 111c in that direction.

[0141] During the electrical stimulation pulse output process, the control circuit 130 controls the voltage adjustment module 112 through PWM or DAC to gradually increase the supply voltage V_STIM of the H-bridge module 111 until it detects that the absolute value of the voltage across the patient load 140, i.e., the difference between the output voltages of the first voltage sampling module and the second voltage sampling unit, reaches a set voltage range. The voltage is then increased and maintained. During subsequent electrical stimulation pulse output processes, if the control circuit 130 determines that the voltage sampled across the patient load 140 exceeds a preset voltage range, the control circuit 130 controls the H-bridge module 111 to stop outputting electrical stimulation pulses to the patient load 140 and indicates that the load 140 is short-circuited. If the control circuit 130 determines that the voltage sampled across the patient load 140 is lower than the preset voltage range, the control circuit 130 controls the H-bridge module 111 to stop outputting electrical stimulation pulses to the patient load 140 and indicates that the load 140 has poor contact.

[0142] When the control circuit 130 receives an adjustment command to adjust the output preset current value, it outputs the voltage value corresponding to the adjusted preset current value to the constant current control module 113 via PWM or DAC. If the adjustment command is to increase the preset current value, the control circuit 130 again controls the voltage adjustment module 112 to increase the supply voltage of the H-bridge module 111 until it detects that the voltage sampled across the patient load 140 rises to the changed set voltage range, at which point it stops increasing the voltage and maintains the output voltage. If the adjustment command is to decrease the preset current value, the control circuit 130 controls the voltage adjustment module 112 to decrease the supply voltage of the H-bridge module 111 until it detects that the voltage sampled across the patient load 140 falls below the changed set voltage range, at which point it stops decreasing the voltage and maintains the output voltage.

[0143] During the electrical stimulation pulse output process, the first voltage detection module 121, the second voltage detection module 122, and the current detection module 124 are similarly sampled to calculate the impedance value of the patient load 140, thereby displaying the current status of the patient load 140 and the electrical stimulation circuit in real time. If the control circuit 130 determines that the impedance value of the patient load 140 exceeds the preset impedance range, the H-bridge module 111 is controlled to stop outputting electrical stimulation pulses to the patient and annunciate that the load 140 is in poor contact. If the control circuit 130 determines that the impedance value of the patient load 140 is below the preset impedance range, the H-bridge module 111 is controlled to stop outputting electrical stimulation pulses to the patient and annunciate that the load 140 is short-circuited.

[0144] Optionally, during the electrical stimulation pulse output process, the control circuit 130 performs AD sampling on the first voltage detection module 121, the second voltage detection module 122, and the current detection module 124 to determine whether the power supply voltage provided by the voltage adjustment module 112 to the H-bridge module 111 is consistent with a preset voltage value, and to determine whether the current flowing through the patient load 140 is consistent with a preset current value. If any of them is inconsistent, the H-bridge module 111 is controlled to stop outputting electrical stimulation pulses to the patient and prompt an internal circuit fault. In this embodiment, it is determined whether the power supply voltage provided by the voltage adjustment module 112 to the H-bridge module 111 is consistent with the preset voltage value, and whether the current flowing through the patient load 140 is consistent with the preset current value. If a fault is found, the output of electrical stimulation pulses to the patient is stopped, which can further ensure the safety of the patient.

[0145] The present application also provides an electrical stimulation therapy device. The electrical stimulation therapy device includes a first electrode sheet, a second electrode sheet, and an electrical stimulation circuit as described in any of the above embodiments. The electrical stimulation circuit outputs electrical stimulation pulses to a load 140 through the first electrode sheet and the second electrode sheet.

[0146] The present application also provides a control device for an electrical stimulation circuit. Figure 11As shown, a control device for an electrical stimulation circuit includes a control module 210 and an acquisition module 220. The control module 210 is used to control the electrical stimulation circuit to output electrical stimulation pulses to a load; the amplitude of the electrical stimulation pulse current is equal to a preset current value; the acquisition module 220 is used to obtain the voltage and current values ​​output by the electrical stimulation circuit to the load, and obtain the impedance value of the load based on the voltage and current values ​​output by the electrical stimulation circuit to the load; the control module 210 is also used to control the electrical stimulation circuit to stop outputting electrical stimulation pulses to the load when the impedance value of the load is not within a preset impedance range.

[0147] In one embodiment, the control module 210 includes a first control unit and a second control unit. The first control unit is configured to control the electrical stimulation circuit to output a preset pulse current to the load; the amplitude of the preset pulse current is a preset current value; and the second control unit is configured to gradually increase the supply voltage of the electrical stimulation circuit until the voltage output by the electrical stimulation circuit to the load reaches a set voltage range.

[0148] In one embodiment, the control device of the electrical stimulation circuit also includes a judgment module, which is used to judge whether the voltage value output by the electrical stimulation circuit to the load is within a set voltage range and whether the current value output by the electrical stimulation circuit to the load is inconsistent with a preset current value. The control module 210 is also used to control the electrical stimulation circuit to stop outputting electrical stimulation pulses to the load when either the voltage value output by the electrical stimulation circuit to the load is not within the set voltage range or the current value output by the electrical stimulation circuit to the load is inconsistent with the preset current value.

[0149] In one embodiment, the control module 210 is also used to receive an adjustment command; when the adjustment command is to increase the intensity of the electrical stimulation pulse, the electrical stimulation circuit is controlled to adjust the preset pulse current output to the load, the amplitude of the adjusted preset pulse current is the increased preset current value, and the power supply voltage of the electrical stimulation circuit is increased until the voltage output by the electrical stimulation circuit to the load reaches the increased set voltage range; when the adjustment command is to reduce the intensity of the electrical stimulation pulse, the control module 210 controls the electrical stimulation circuit to adjust the preset pulse current output to the load, the amplitude of the adjusted preset pulse current is the reduced preset current value, and the power supply voltage of the electrical stimulation circuit is reduced until the voltage output by the electrical stimulation circuit to the load reaches the reduced set voltage range.

[0150] Before the step of controlling the electrical stimulation circuit to output electrical stimulation pulses to the load, the method further includes:

[0151] In one embodiment, the control device of the electrical stimulation circuit also includes a test module, which is used to control the electrical stimulation circuit to output test electrical stimulation pulses to the load; the acquisition module 220 is also used to obtain the voltage value and current value output by the electrical stimulation circuit to the load; the control module 210 is also used to obtain the impedance value of the load based on the voltage value and current value output by the electrical stimulation circuit to the load; when the impedance value of the load is not within the preset impedance range, the electrical stimulation circuit is controlled to stop outputting test electrical stimulation pulses to the load.

[0152] In one embodiment, the control device of the electrical stimulation circuit also includes an alarm module, and the preset impedance range includes an impedance upper limit and an impedance lower limit. The alarm module is used to indicate that the load has poor contact when the impedance value of the load exceeds the impedance upper limit; and to indicate that the load is short-circuited when the impedance value of the load is lower than the impedance lower limit.

[0153] The present application also provides a computer device, including a memory and a processor; a computer program that can be run on the processor is stored on the processor, and when the processor executes the computer program, the steps of the method described in any of the above embodiments are implemented.

[0154] The above method and system can be implemented in a computer device. The internal structure of the computer device is shown in FIG. Figure 12 As shown. The computer device includes a processor, a memory and a network interface connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, the steps of the control method of the electrical stimulation circuit in any of the aforementioned embodiments are implemented. Those skilled in the art will understand that Figure 12 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0155] In one embodiment, a storage medium stores a computer program, which, when executed by a processor, implements the steps of any of the above methods.

[0156] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0157] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0158] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An electrical stimulation circuit, characterized in that: include: an electrical stimulation generating circuit, a detection circuit, and a control circuit; The control circuit is connected to the electrical stimulation generating circuit and the detection circuit, and is used to control the electrical stimulation generating circuit to output electrical stimulation pulses to the load, wherein the amplitude of the electrical stimulation pulse current is equal to a preset current value; The detection circuit is also connected to the electrical stimulation generating circuit, and the detection circuit is used to detect the voltage value and current value output by the electrical stimulation generating circuit to the load; The control circuit is further configured to obtain an impedance value of the load based on the voltage and current values ​​output by the electrical stimulation generating circuit to the load, and to control the electrical stimulation generating circuit to stop outputting the electrical stimulation pulse to the load when the impedance value is not within a preset impedance range; And the electrical stimulation generating circuit includes: An H-bridge module, comprising an upper arm left bridge unit, an upper arm right bridge unit, a lower arm left bridge unit, and a lower arm right bridge unit, which are connected to the control circuit and the load; the control circuit controls the upper arm left bridge unit and the lower arm right bridge unit to be turned on simultaneously or controls the upper arm right bridge unit and the lower arm left bridge unit to be turned on simultaneously, and the control circuit controls the upper arm left bridge unit and the lower arm right bridge unit to be turned on simultaneously and controls the upper arm right bridge unit and the lower arm left bridge unit to be turned on simultaneously in turn according to a preset pulse width and a preset frequency; a voltage adjustment module connected to the control circuit, the upper arm left bridge unit, and the upper arm right bridge unit; the voltage adjustment module is used to provide a preset voltage to the upper arm left bridge unit and the upper arm right bridge unit according to a preset voltage value provided by the control circuit; A constant current control module is connected to the control circuit, the detection circuit, the lower arm left bridge unit and the lower arm right bridge unit; the constant current control module is used to adjust the current value output by the H-bridge module to the load to be equal to the preset current value provided by the control circuit.

2. The electrical stimulation circuit according to claim 1, wherein: The voltage adjustment module includes a first energy storage capacitor, a second energy storage capacitor, an inductor, a first transistor and a first diode; the anode of the first energy storage capacitor and one end of the inductor are both connected to the power supply, the other end of the inductor is connected to the anode of the first diode and the collector of the first transistor, the base of the first transistor is connected to the control circuit, the anode of the second energy storage capacitor is connected to the cathode of the first diode and the H-bridge module, and the cathode of the first energy storage capacitor, the emitter of the first transistor and the cathode of the second energy storage capacitor are all connected to the ground terminal.

3. The electrical stimulation circuit according to claim 1, wherein: The constant current control module includes a first operational amplifier and a selection switch; the non-inverting input terminal of the first operational amplifier is connected to the control circuit, and the reverse input terminal of the first operational amplifier is connected to the detection circuit; the first electrical connection terminal of the selection switch is connected to the output terminal of the first operational amplifier and the control circuit, the second electrical connection terminal of the selection switch is connected to the lower arm left bridge unit, and the third electrical connection terminal of the selection switch is connected to the lower arm right bridge unit.

4. The electrical stimulation circuit according to claim 3, characterized in that The upper arm right bridge unit includes a second transistor and a fifth transistor, the emitter of the second transistor is connected to the voltage adjustment module, the collector of the second transistor is connected to the load, the base of the second transistor is connected to the collector of the fifth transistor, the emitter of the fifth transistor is connected to the ground terminal, and the base of the fifth transistor is connected to the control circuit; The upper arm left bridge unit includes a third transistor and a fourth transistor, the emitter of the third transistor is connected to the voltage adjustment module, the collector of the third transistor is connected to the load, the base of the third transistor is connected to the collector of the fourth transistor, the emitter of the fourth transistor is connected to the ground terminal, and the base of the fourth transistor is connected to the control circuit; The lower arm left bridge unit includes a sixth transistor, the collector of the sixth transistor is connected to the load, the emitter of the sixth transistor is connected to the ground terminal, and the base of the sixth transistor is connected to the second electrical connection terminal of the selection switch; The lower arm right bridge unit includes a seventh transistor, the collector of the seventh transistor is connected to the load, the emitter of the seventh transistor is connected to the ground end, and the base of the seventh transistor is connected to the third electrical connection end of the selection switch.

5. The electrical stimulation circuit according to claim 1, wherein: The detection circuit comprises: a first voltage detection module, one end of the first voltage detection module being connected between the upper arm left bridge unit and the lower arm left bridge unit, the other end of the first voltage detection module being connected to the control circuit, and the first voltage detection module being used to amplify or attenuate the voltage output by the H-bridge module to one end of the load; a second voltage detection module, one end of the second voltage detection module being connected between the upper arm right bridge unit and the lower arm right bridge unit, the other end of the second voltage detection module being connected to the control circuit, and the second voltage detection module being used to amplify or attenuate the voltage output by the H-bridge module to the other end of the load; A current sampling module, one end of which is connected to the lower arm left bridge unit, the lower arm right bridge unit, and the constant current control module, and the other end of which is connected to the ground terminal, and the current sampling module is used to collect the current value output by the H-bridge module to the load; A current detection module, one end of which is connected to the current sampling module, and the other end of which is connected to the control circuit. The current detection module is used to amplify the current value collected by the current sampling module and output it to the control circuit.

6. The electrical stimulation circuit according to claim 5, characterized in that The first voltage detection module includes a second operational amplifier, a first voltage dividing resistor and a second voltage dividing resistor; one end of the first voltage dividing resistor and the second voltage dividing resistor connected in series is connected between the upper arm left bridge unit and the lower arm left bridge unit, and the other end of the first voltage dividing resistor and the second voltage dividing resistor connected in series is connected to the ground end; the same-direction input end of the second operational amplifier is connected between the first voltage dividing resistor and the second voltage dividing resistor, the inverting input end of the second operational amplifier is connected to the output end of the second operational amplifier, and the output end of the second operational amplifier is also connected to the control circuit.

7. The electrical stimulation circuit according to claim 6, characterized in that The second voltage detection module includes a third operational amplifier, a third voltage-dividing resistor and a fourth voltage-dividing resistor; one end of the third voltage-dividing resistor and the fourth voltage-dividing resistor connected in series is connected between the upper arm right bridge unit and the lower arm right bridge unit, and the other end of the third voltage-dividing resistor and the fourth voltage-dividing resistor connected in series is connected to the ground end; the inverting input end of the third operational amplifier is connected between the third voltage-dividing resistor and the fourth voltage-dividing resistor, the non-inverting input end of the third operational amplifier is connected to the output end of the third operational amplifier, and the output end of the third operational amplifier is also connected to the control circuit.

8. The electrical stimulation circuit according to claim 6, wherein: The current detection module includes a fourth operational amplifier, a first amplifying resistor, and a second amplifying resistor; the non-inverting input terminal of the fourth operational amplifier is connected to the current sampling module, the inverting input terminal of the fourth operational amplifier is connected to the ground terminal through the first amplifying resistor, the inverting input terminal of the fourth operational amplifier is also connected to the output terminal of the fourth operational amplifier through the second amplifying resistor, and the output terminal of the fourth operational amplifier is also connected to the control circuit.

9. An electrical stimulation therapy device, characterized in that The device comprises a first electrode sheet, a second electrode sheet and the electrical stimulation circuit according to any one of claims 1 to 8, wherein the electrical stimulation circuit outputs the electrical stimulation pulse to the load through the first electrode sheet and the second electrode sheet.

10. A control device for the electrical stimulation circuit according to any one of claims 1 to 8, characterized in that: include: A control module, used for controlling the electrical stimulation circuit to output electrical stimulation pulses to the load; The amplitude of the electrical stimulation pulse current is equal to the preset current value; an acquisition module, configured to acquire a voltage value and a current value outputted by the electrical stimulation circuit to the load, and obtain an impedance value of the load according to the voltage value and the current value outputted by the electrical stimulation circuit to the load; as well as The control module is further configured to control the electrical stimulation circuit to stop outputting the electrical stimulation pulse to the load when the impedance value of the load is not within a preset impedance range.

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