CN111991695A

CN111991695A - Electric stimulation circuit, control method and device thereof and treatment equipment

Info

Publication number: CN111991695A
Application number: CN202010758188.1A
Authority: CN
Inventors: 易辉; 刘娟
Original assignee: Shenzhen Jumper Medical Equipment Co Ltd
Current assignee: Shenzhen Jumper Medical Equipment Co Ltd
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2020-11-27

Abstract

The invention relates to an electrical stimulation circuit, a control method of the electrical stimulation circuit, a control device of the electrical stimulation circuit and electrical stimulation treatment equipment. An electrical stimulation circuit comprising: the device comprises an electric stimulation generating circuit, a detection circuit and a control circuit; the control circuit is connected with the electrical stimulation generating circuit and the detection circuit, the control circuit is used for controlling the electrical stimulation generating circuit to output electrical stimulation pulses to the load, and the amplitude of the current of the electrical stimulation pulses is equal to a preset current value; the detection circuit is also connected with the electrical stimulation generation circuit and is used for detecting the voltage value and the current value output to the load by the electrical stimulation generation circuit; the control circuit is also used for obtaining the impedance value of the load according to the voltage value and the current value output by the electric stimulation generating circuit to the load, and controlling the electric stimulation generating circuit to stop outputting electric stimulation pulses to the load when the impedance value is not in the preset impedance range. The electric stimulation circuit can protect the safety of a patient in time and prevent the patient from being stabbed or burned.

Description

Electric stimulation circuit, control method and device thereof and treatment equipment

Technical Field

The invention relates to the technical field of medical instruments, in particular to an electrical stimulation circuit, a control method of the electrical stimulation circuit, a control device of the electrical stimulation circuit and electrical stimulation treatment equipment.

Background

The electrical stimulation treatment device is suitable for treatment of various pains, muscle dysfunction and the like. The action mechanism is that the equipment outputs specific pulse current to act on the human body through the electrodes.

The output of the electrical stimulation can be divided into two modes of constant current output and constant voltage output. As a load for the electrical stimulation treatment device, the impedance of the human skin and tissue (including the contact impedance) varies over a wide range, possibly between a few hundred ohms to infinity. If the constant voltage output electric stimulation is adopted, the high voltage stimulation can be ensured not to occur in the output process, but the output current of the electric stimulation can be changed due to the change of the impedance in the using process, so that the treatment feeling is not suitable, and particularly when the impedance is reduced, the current is increased, and the skin can be burnt. In order to ensure that the current output is fixed and controllable according to different human load impedances, most of the traditional electrical stimulation treatment equipment is of a constant-current output type, but the following problems are that poor contact between electrode plates and skin often occurs in actual use, so that the impedance is overlarge, even the electrode plates fall off to cause open circuit, and higher voltage can occur between the two electrode plates. When the electrode sheet is pressed again in contact with the skin in such a case, the higher voltage causes an unexpectedly instantaneous larger current to the human body, stabbing the skin, and possibly burning the skin if frequently occurring.

Aiming at the problem of poor contact between an electrode plate and skin of a constant current output type electrical stimulation treatment device, the currently common electrode impedance detection method is to judge whether a stimulation electrode falls off or not through the open-close ring state of constant current feedback control, the judgment method is simple and rough, only the condition when the electrode impedance is large (or infinite) can be detected, and the actual condition is that when the electrode impedance is increased to a certain degree, a larger stimulation output voltage is added between the electrode plate and the skin to maintain the constant current characteristic due to the feedback mechanism of the constant current control, and the increase of the electrode impedance is generally accompanied with the reduction of the contact area between the stimulation electrode and the skin, so that the current density flowing through the skin is increased, and the patient has a pricking feeling and even burns the skin of the patient.

Disclosure of Invention

Based on this, it is necessary to provide an electrical stimulation circuit, a control method for the electrical stimulation circuit, a control device for the electrical stimulation circuit, and an electrical stimulation treatment apparatus, for the problem that the conventional technique can only detect the situation that the electrode impedance is very large (or infinite), and when the electrode impedance is increased to a certain degree, the current density flowing through the skin is increased, so that the patient has a sharp feeling, even burns the skin.

An electrical stimulation circuit comprising: the device comprises an electric stimulation generating circuit, a detection circuit and a control circuit; the control circuit is connected with the electrical stimulation generating circuit and the detection circuit, and is used for controlling the electrical stimulation generating circuit to output electrical stimulation pulses to a load, and the amplitude of the current of the electrical stimulation pulses is equal to a preset current value;

the detection circuit is also connected with the electrical stimulation generation circuit and is used for detecting the voltage value and the current value output to the load by the electrical stimulation generation circuit;

the control circuit is further used for obtaining the impedance value of the load according to the voltage value and the current value output by the electric stimulation generating circuit to the load, and controlling the electric stimulation generating circuit to stop outputting the electric stimulation pulse to the load when the impedance value is not within a preset impedance range.

In one embodiment, the electrical stimulation generation circuit comprises:

the H-bridge module comprises 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 with 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 conducted simultaneously or controls the upper arm right bridge unit and the lower arm left bridge unit to be conducted simultaneously;

a voltage adjusting module connected to the control circuit, the upper arm left bridge unit, and the upper arm right bridge unit; the voltage adjusting module is used for providing preset voltage for the upper arm left bridge unit and the upper arm right bridge unit according to a preset voltage value provided by the control circuit;

the constant current control module is connected with 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 for adjusting the current value output to the load by the H-bridge module to be equal to the preset current value provided by the control circuit.

In one embodiment, the voltage adjustment module includes a first energy storage capacitor, a second energy storage capacitor, an inductor, a first triode, and a first diode; the positive pole of first energy storage capacitor with the one end of inductance all is connected with the power, the other end of inductance with the positive pole of first diode with the collecting electrode of first triode is connected, the base of first triode with control circuit connects, the positive pole of second energy storage capacitor with the negative pole of first diode with the H bridge module is connected, the negative pole of first energy storage capacitor, the projecting pole of first triode and the negative pole of second energy storage capacitor all with the earthing terminal is connected.

In one embodiment, the constant current control module comprises a first operational amplifier and a selection switch; the same-direction input end of the first operational amplifier is connected with the control circuit, and the reverse-direction input end of the first operational amplifier is connected with the detection circuit; the first electric connection end of the selection switch is connected with the output end of the first operational amplifier and the control circuit, the second electric connection end of the selection switch is connected with the lower arm left bridge unit, and the third electric connection end of the selection switch is connected with the lower arm right bridge unit.

In one embodiment, the upper arm right bridge unit includes a second triode and a fifth triode, an emitter of the second triode is connected with the voltage regulation module, a collector of the second triode is connected with the load, a base of the second triode is connected with a collector of the fifth triode, an emitter of the fifth triode is connected with the ground terminal, and a base of the fifth triode is connected with the control circuit;

the upper arm left bridge unit comprises a third triode and a fourth triode, an emitting electrode of the third triode is connected with the voltage adjusting module, a collecting electrode of the third triode is connected with the load, a base electrode of the third triode is connected with a collecting electrode of the fourth triode, an emitting electrode of the fourth triode is connected with the grounding end, and a base electrode of the fourth triode is connected with the control circuit;

the lower arm left bridge unit comprises a sixth triode, a collector of the sixth triode is connected with the load, an emitter of the sixth triode is connected with the grounding end, and a base of the sixth triode is connected with the second electric connection end of the selection switch;

the lower arm right bridge unit comprises a seventh triode, a collector of the seventh triode is connected with the load, an emitter of the seventh triode is connected with a ground terminal, and a base of the seventh triode is connected with a third electric connection end of the selection switch.

In one embodiment, the detection circuit comprises:

a first voltage detection module, one end of which is connected between the upper arm left bridge unit and the lower arm left bridge unit, and the other end of which is connected with the control circuit, the first voltage detection module being configured 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 which is connected between the upper arm right bridge unit and the lower arm right bridge unit, and the other end of which is connected with the control circuit, wherein the second voltage detection module is used for amplifying or attenuating the voltage output by the H-bridge module to the other end of the load;

one end of the current sampling module is connected with the lower arm left bridge unit, the lower arm right bridge unit and the constant current control module, the other end of the current sampling module is connected with the grounding end, and the current sampling module is used for collecting a current value output to the load by the H-bridge module;

the current detection module, the one end of current detection module with current sampling module connects, the other end of current detection module with control circuit connects, current detection module is used for enlargiing the current value that current sampling module gathered and output give control circuit.

In one embodiment, the first voltage detection module comprises a second operational amplifier, a first voltage dividing resistor and a second voltage dividing resistor; one end of the first voltage-dividing resistor and one end of the second voltage-dividing resistor after being connected in series are 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 after being connected in series are connected with 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 reverse-direction input end of the second operational amplifier is connected with the output end of the second operational amplifier, and the output end of the second operational amplifier is further connected with the control circuit.

In one embodiment, the second voltage detection module comprises a third operational amplifier, a third voltage dividing resistor and a fourth voltage dividing resistor; one end of the third voltage dividing resistor and one end of the fourth voltage dividing resistor after being connected in series are 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 other end of the fourth voltage dividing resistor after being connected in series are connected with 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 homodromous input end of the third operational amplifier is connected with the output end of the third operational amplifier, and the output end of the third operational amplifier is further connected with the control circuit.

In one embodiment, the current detection module comprises a fourth operational amplifier, a first amplifying resistor and a second amplifying resistor; the homodromous input end of the fourth operational amplifier is connected with the current sampling module, the reverse input end of the fourth operational amplifier is connected with the grounding end through the first amplifying resistor, the reverse input end of the fourth operational amplifier is connected with the output end of the fourth operational amplifier through the second amplifying resistor, and the output end of the fourth operational amplifier is connected with the control circuit.

An electrostimulation therapy device comprising a first electrode pad, a second electrode pad and an electrostimulation circuit as described in any of the above, the electrostimulation circuit outputting the electrostimulation pulse to the load through the first electrode pad and the second electrode pad.

A method of controlling an electrical stimulation circuit, comprising:

controlling the electrical stimulation circuit to output electrical stimulation pulses to the load; the amplitude value of the electrical stimulation pulse current is equal to a preset current value;

acquiring a voltage value and a current value output by the electrical stimulation circuit to the load, and acquiring an impedance value of the load according to the voltage value and the current value output by the electrical stimulation circuit to the load; and

and when the impedance value of the load is not in a preset impedance range, controlling the electrical stimulation circuit to stop outputting the electrical stimulation pulse to the load.

In one embodiment, the step of controlling the electrical stimulation circuit to output the electrical stimulation pulses to the load comprises:

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

and 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.

In one embodiment, the method further comprises the following steps:

acquiring a voltage value and a current value output by the electrical stimulation circuit to the load;

and when the voltage value output by the electrical stimulation circuit to the load is not in the set voltage range or the current value output by the electrical stimulation circuit to the load is inconsistent with the preset current value, controlling the electrical stimulation circuit to stop outputting the electrical stimulation pulse to the load.

In one embodiment, after the step of controlling the electrical stimulation circuit to output the electrical stimulation pulse to the load, the method further includes:

receiving an adjustment command;

when the adjustment command is to increase the current amplitude of the electrical stimulation pulse, adjusting to output a preset pulse current to the patient, wherein the amplitude of the adjusted preset pulse current is an adjusted preset current value, and increasing the power supply voltage of the electrical stimulation circuit until the voltage output by the electrical stimulation circuit to the load reaches an adjusted preset voltage range;

and when the adjustment command is to reduce the current amplitude of the electrical stimulation pulse, adjusting to output a preset pulse current to the patient, wherein the amplitude of the adjusted preset pulse current is an adjusted preset current value, and reducing the power supply voltage of the electrical stimulation circuit until the voltage output by the electrical stimulation circuit to the load reaches an adjusted preset voltage range.

In one embodiment, before the step of controlling the electrical stimulation circuit to output the electrical stimulation pulse to the load, the method further includes:

outputting a test electrical stimulation pulse to the load;

and when the impedance value of the load is not in a preset impedance range, controlling the electrical stimulation circuit to stop outputting the test electrical stimulation pulse to the load.

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

when the impedance value of the patient exceeds the upper impedance limit, indicating that the load is in poor contact;

and when the impedance value of the patient is lower than the lower impedance limit, indicating that the load is short-circuited.

A control device for an electrical stimulation circuit comprising:

the control module is used for controlling the electrical stimulation circuit to output electrical stimulation pulses to the load; the amplitude value of the electrical stimulation pulse current is equal to a preset current value;

the acquisition module is used for acquiring the voltage value and the current value output by the electrical stimulation circuit to the load and obtaining the impedance value of the load according to the voltage value and the current value output by the electrical stimulation circuit to the load; and

the control module is further used for 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 a preset impedance range.

According to the electrical stimulation circuit, the control method of the electrical stimulation circuit, the control device of the electrical stimulation circuit and the electrical stimulation treatment equipment, the voltage value and the current value output by the electrical stimulation circuit to a patient load are detected in real time, so that the impedance value of the patient load is calculated, and once the impedance value of the patient is not within the preset impedance range, the electrical stimulation circuit is controlled to stop outputting electrical stimulation pulses to the patient, so that the safety of the patient can be protected in time, and the patient is prevented from being irritated or burned.

Drawings

Fig. 1 is a flowchart of a control method of an electrical stimulation circuit in an embodiment.

Fig. 2 is a flowchart of a control method of the electrical stimulation circuit in another embodiment.

FIG. 3 is a block diagram of an electrical stimulation circuit in an embodiment.

FIG. 4 is a block diagram of an electrical stimulation circuit in another embodiment.

Fig. 5 is a circuit diagram of a voltage adjustment module according to an embodiment.

FIG. 6 is a circuit diagram of a constant current control module in one embodiment.

FIG. 7 is a circuit diagram of an H-bridge module in one embodiment.

FIG. 8 is a circuit diagram of a first voltage detection module according to an embodiment.

FIG. 9 is a circuit diagram of a second voltage detection module in an embodiment.

FIG. 10 is a circuit diagram of a current detection module in an embodiment.

FIG. 11 is a block diagram of a control device of the electrical stimulation circuit in an embodiment.

FIG. 12 is a block diagram of a computer device in an embodiment.

Description of reference numerals:

110. an electrical stimulation generating circuit; 120. a detection circuit; 130. a control circuit; 111. an H-bridge module; 112. a voltage adjustment module; 113. a constant current control module; 111a, an upper arm left bridge unit; 111b, an upper arm right bridge unit; 111c, a lower arm left bridge unit; 111d, a lower arm right bridge unit; 121. a first voltage detection module; 122. a second voltage detection module; 123. a current sampling module; 124. a current detection module; 140. a load; 210. a control module; 220. and an acquisition module.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Fig. 1 is a flowchart of a control method of an electrical stimulation circuit in an embodiment. As shown in fig. 1, the control method of the electrical stimulation circuit includes the steps of:

and step S120, controlling the electrical stimulation circuit to output electrical stimulation pulses to the load.

Specifically, the control method of the electrical stimulation circuit provided in this embodiment may be completed based on any electrical stimulation circuit that can implement the above steps. And generating an electrical stimulation pulse through an electrical stimulation circuit and outputting the electrical stimulation pulse to a load. The load may be a human body or any other living body that needs to be treated with electrical stimulation pulses. For example, at least two electrode plates are arranged at the output end of the electrical stimulation circuit, the two electrode plates are connected with a patient, can be attached to the skin surface of the patient or implanted into the patient, and the electrical stimulation circuit is controlled to output electrical stimulation pulses to the patient through the electrode plates. Parameters of the electrical stimulation pulses, such as current amplitude, voltage amplitude, frequency, etc., may be set according to the 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 realizing constant current output.

Step S131, obtaining the voltage value and the current value output by the electrical stimulation circuit to the load, and obtaining the impedance value of the load according to the voltage value and the current value output by the electrical stimulation circuit to the load.

Specifically, in the process of outputting the electrical stimulation pulse to the patient load, the current value and the 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, namely the impedance value of the patient load, is calculated.

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

Step S140, controlling the electrical stimulation circuit to stop outputting the electrical stimulation pulse to the load.

Specifically, the preset impedance range may be set as required. For example, the setting is made according to a standard impedance value of the treatment site of the patient. When the impedance value of the load is within the preset impedance range, the normal connection between the electrical stimulation circuit and the load is indicated, and the electrical stimulation circuit can be controlled to continuously output electrical stimulation pulses to the load; when the impedance value of the load is not within the preset impedance range, the abnormal connection between the electrical stimulation circuit and the load is represented, when electrical stimulation treatment is carried out on a patient, the abnormal connection between the electrical stimulation circuit and the patient easily causes the patient to be stabbed and even burns the skin of the patient, and at the moment, the electrical stimulation circuit is controlled to stop outputting electrical stimulation pulses to the load so as to ensure the safety of the patient.

According to the control method of the electrical stimulation circuit, the voltage value and the current value output by the electrical stimulation circuit to the patient load are detected in real time, so that the impedance value of the patient load is calculated, and once the impedance value of the patient load is not within the preset impedance range, the electrical stimulation circuit is controlled to stop outputting electrical stimulation pulses to the patient, so that the safety of the patient can be protected in time, and the patient is prevented from being pricked or burned.

Fig. 2 is a control method of the electrical stimulation circuit in another embodiment, and as shown in fig. 2, the control method of the electrical stimulation circuit further includes performing steps S111 to S114 before performing step S120.

And step S111, controlling the electrical stimulation circuit to output a test electrical stimulation pulse to the load.

Specifically, the electrical stimulation circuit is controlled to output test electrical stimulation pulses to the patient. The current amplitude of the test electrical stimulation pulse, namely the current value output by the electrical stimulation circuit to the load, can be a small value lower than the standard current so as not to cause human body reaction, and the voltage value output by the electrical stimulation circuit to the load can also be controlled to be a small voltage value which does not cause human body reaction, and the frequency and the pulse width of the test electrical stimulation pulse can be respectively the test frequency and the test pulse width.

And step S112, acquiring a voltage value and a current value output 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 output by the electrical stimulation circuit to the load.

In step S113, it is determined whether the impedance value of the load is within a preset impedance range.

And step S114, controlling the electrical stimulation circuit to stop outputting the test electrical stimulation pulse to the load.

Specifically, step S112 is the same as or similar to step S131, and step S113 is the same as or similar to step S132. And when the impedance value of the load is not in the preset impedance range, indicating that the connection between the load and the electrical stimulation circuit is abnormal, and controlling the electrical stimulation circuit to stop outputting the test electrical stimulation pulse to the patient. The physician or technician can check the connection between the electrical stimulation circuit and the patient and reconnect the electrical stimulation circuit to the patient. And then, the electrical stimulation circuit can be continuously controlled to output the test stimulation pulse to the patient until the impedance value of the load is judged to be within the preset range, and then the electrical stimulation circuit is controlled to output the electrical stimulation pulse for treatment to the patient. In this embodiment, the test electrical stimulation pulse is used for testing before the electrical stimulation pulse for treatment is output to the patient, and since each parameter of the test electrical stimulation pulse is based on the reaction that does not cause the human body, the safety of the patient can be ensured even if the connection between the electrical stimulation circuit and the patient load is abnormal.

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

And step S121, controlling the electrical stimulation circuit to output preset pulse current to the load.

And 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.

Specifically, after the electrical stimulation circuit and the patient are normally connected through testing, the electrical stimulation circuit is controlled to output preset pulse current to the patient, the amplitude of the preset pulse current is a preset current value, the frequency and the pulse width of the preset pulse current can be respectively preset frequency and preset pulse width, and the power supply voltage of the electrical stimulation circuit is gradually increased until the voltage value output by the electrical stimulation circuit to the load reaches a set voltage range. In the embodiment, the constant current output is kept in the normal process of outputting the electrical stimulation pulse to the patient, the current amplitude is a preset current value, the maximum output voltage is limited to be a set voltage range, and the electrical stimulation pulse is output to the patient under constant current and constant voltage, so that the treatment effect on the patient is ensured, and meanwhile, the discomfort of treatment caused by the change of the impedance value of the load of the patient is avoided.

In an embodiment, after step S120, the method may further include:

in step S151, an adjustment command is received.

Specifically, after step S120, the voltage value applied across the patient load by the electrical stimulation circuit is within the set voltage range, and the current value applied across the patient load by the electrical stimulation circuit is the preset current value. The adjustment command may include increasing the intensity of the electrical stimulation pulse output to the patient, and the current value and the voltage value output to the patient load by the corresponding electrical stimulation circuit at this time need to be increased correspondingly; the adjustment command may further include decreasing the intensity of the electrical stimulation pulse output to the patient, and the corresponding current value and voltage value output by the electrical stimulation circuit to the patient at that time may need to be decreased correspondingly.

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, where 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.

Step S173, when the adjustment command is to decrease the intensity of the electrical stimulation pulse, adjusting the preset pulse current output to the load, where the amplitude of the adjusted preset pulse current is the decreased preset current value, and decreasing the power supply voltage of the electrical stimulation circuit until the voltage output by the electrical stimulation circuit to the load reaches the decreased set voltage range.

In this embodiment, the adjustment command may be input to the electrical stimulation circuit through the input device, and the electrical stimulation circuit adjusts the voltage value and the current value output to the patient load according to the command content after receiving the adjustment command, thereby adjusting the intensity of the electrical stimulation pulse loaded to the patient.

In an embodiment, steps S133 to S135 may be further included after step S120.

Step S133 obtains a voltage value and a current value output from the electrical stimulation circuit to the load.

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

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

When the voltage value output by the electrical stimulation circuit to the load is not within the set voltage range and the current value output by the electrical stimulation circuit to the load is inconsistent with the preset current value, step S140 is executed to control the electrical stimulation circuit to stop outputting the electrical stimulation pulse to the load.

Specifically, a voltage detection circuit and a current detection circuit may be provided to detect a voltage value and a current value output from the electrical stimulus circuit to the load, respectively. 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 kept within the set voltage range, and the current value output by the electrical stimulation circuit to the patient load should be kept at the preset current value. In this embodiment, whether the inside of the electrical stimulation circuit breaks down or not can be detected in time according to the comparison and judgment between the voltage value output by the electrical stimulation circuit to the patient load and the set voltage range and the comparison and judgment between the current value output by the electrical stimulation circuit to the patient load and the preset current value, so that the safety of the patient is ensured.

In an embodiment, the controlling the electrical stimulation circuit to stop outputting the test electrical stimulation pulse to the load in step S113 when the impedance value of the load is not within the preset impedance range and/or the controlling the electrical stimulation circuit to stop outputting the electrical stimulation pulse to the load in step S160 when the impedance value of the load is not within the preset impedance range may further include the following steps:

when the impedance value of the load exceeds the upper impedance limit, the load is indicated to be in poor contact.

And when the impedance value of the load is lower than the lower impedance limit, indicating that the load is short-circuited.

Specifically, an alarm device may be provided, and different alarm forms of the alarm device are used to identify that the load is not in contact with the load and short circuit occurs, for example, a flashing red light is set as the load is in poor contact, and a flashing yellow light is set as the load is short circuit, or the load is in poor contact and short circuit may be prompted by a voice alarm device, or the prompt may be performed by text display or the like.

It should be noted that, in the above embodiment, the steps are not limited to the implementation sequence shown in fig. 1 and fig. 2, for example, step S131, step S132, and step S140 may be performed at the same time as any step is performed, and for example, step S133 to step S140 may be performed after step S152 or step S153 is performed.

The application also provides an electrical stimulation circuit, and the control method of the electrical stimulation circuit can be realized through the electrical stimulation circuit. As shown in fig. 3, the electrical stimulation circuit includes an electrical stimulation generation 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 detecting circuit 120, and the control circuit 130 is configured to control the electrical stimulation generating circuit 110 to output electrical stimulation pulses to the load 140. The detection circuit 120 is further connected to the electrical stimulation generation circuit 110, the detection circuit 120 is configured to detect a voltage value and a current value output by the electrical stimulation generation circuit 110 to the load 140, and the control circuit 130 is further configured to obtain an impedance value of the load 140 according to the voltage value and the current value output by the electrical stimulation generation circuit 110 to the load 140, and control the electrical stimulation generation 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.

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

The detection circuit 120 is also connected to the electrical stimulation generation circuit 110, and the detection circuit 120 is configured to detect a voltage value and a current value output by the electrical stimulation generation circuit 110 to the patient load 140 and output the detected values to the control circuit 130, so that the control circuit 130 calculates an impedance value of the patient load 140 according to the current value and the voltage value. For example, the electrical stimulation generation circuit 110 includes a first output terminal and a second output terminal, and the two output terminals are connected to the patient through two electrode pads, respectively. The detection circuit 120 respectively detects the voltage values V of the first output terminals₁And a voltage value V of the second output terminal₂And the value of the current I flowing through the patient is V, the impedance value of the patient connected between the two electrode plates is V₁And V₂The absolute value of the difference of (a) is divided by I.

Then, the control circuit 130 determines whether the impedance value is within a predetermined impedance range, and if not, the control circuit 130 controls the electrical stimulation generating circuit 110 to stop outputting the electrical stimulation pulse to the load 140. The preset impedance range may be determined according to a standard impedance value of a treatment site of a patient, i.e., a site connected between the two electrode pads. If the impedance value of the patient load 140 is judged not to be within the preset impedance range, the abnormal connection between the electrical stimulation generation circuit 110 and the patient is indicated, and the electrical stimulation pulse output to the patient is stopped at the moment, so that the safety of the patient is ensured, and the patient is prevented from being pricked or burned in the treatment process.

The electrical stimulation circuit calculates the impedance value of the patient load 140 by detecting the voltage value and the current value output to the patient by the electrical stimulation generating circuit 110 in real time, and controls the electrical stimulation generating circuit 110 to stop outputting electrical stimulation pulses to the patient once the impedance value of the patient is not within the preset impedance range, so that the safety of the patient can be protected in time, and the patient is prevented from being pricked or burned.

Fig. 4 is a block diagram of an electrical stimulation circuit in another embodiment. As shown in fig. 4, the electrical stimulation generation circuit 110 includes an H-bridge module 111, a voltage adjustment module 112, and a constant current control module 113.

The H-bridge module 111 includes an upper arm left bridge unit 111a, an upper arm right bridge unit 111b, a lower arm left bridge unit 111c, and a lower arm right bridge unit 111d connected to the control circuit 130 and the load 140. The control circuit 130 controls the upper arm left bridge unit 111a and the lower arm right bridge unit 111d to be simultaneously on or controls the upper arm right bridge unit 111b and the lower arm left bridge unit 111c to be simultaneously on. In this embodiment, the control circuit 130 may alternately control the upper arm left bridge unit 111a and the lower arm right bridge unit 111d to be simultaneously conducted and control the upper arm right bridge unit 111b and the lower arm left bridge unit 111c to be simultaneously conducted according to a preset pulse width and a preset frequency, so that 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 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 bidirectional constant-current electrical stimulation pulses to the patient load 140.

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 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 off.

The constant current control module 113 is connected to the control circuit 130, the detection circuit 120, the lower arm left bridge unit 111c, and the lower arm right bridge unit 111 d. The constant current control module 113 is used to adjust the current value output by the H-bridge module 111 to the patient load 140 to be equal to the preset current value provided by the control circuit 130, i.e. to realize the constant current output of the H-bridge module 111.

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 111 b. The voltage adjustment module 112 is used for providing a preset voltage to the upper arm left bridge unit 111a and the upper arm right bridge unit 111b according to a preset voltage value provided by the control circuit 130. The voltage adjustment module 112 may adjust the power voltage according to the preset voltage value provided by the control circuit 130, including boosting or stepping down the power voltage, so as to provide the preset voltage for the H-bridge module 111, so that the voltage output by the H-bridge module 111 to the patient finally reaches and is maintained within the set voltage range. It should be noted that the set voltage range may not be equal to the preset voltage value.

In this embodiment, the constant current control module 113 controls the H-bridge circuit to maintain constant current output during the process of outputting the electrical stimulation pulse, the current value is a preset current value, and the voltage adjustment module 112 limits the range of the output voltage of the H-bridge circuit to be a set voltage range, that is, the electrical stimulation pulse is output to the patient under constant current and constant voltage, so that the treatment effect on the patient is ensured, and discomfort of treatment due to the change of the patient load 140 is avoided.

In an embodiment, still referring to fig. 4, the 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, the other end of the first voltage detection module 121 is connected to the control circuit 130, and 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 the amplified voltage 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, the other end of the second voltage detection module 122 is connected to the control circuit 130, and 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 the amplified voltage to the control circuit 130. It is understood that, for example, when the electrical stimulation circuit is connected to a patient through two electrode pads to perform electrical stimulation treatment on the patient, the first voltage detection module 121 detects the voltage output by one of the electrode pads, the second voltage detection module 122 detects the voltage output by the other electrode pad, and the amplification factor or attenuation of the first voltage detection module 121 and the second voltage detection module 122 can be set as required. The control circuit 130 can obtain the voltage value output by the H-bridge module 111 to the patient only by calculating 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.

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, the other end of the current sampling module 123 is connected to the ground terminal, and the current sampling module 123 is configured to collect a current value output by the H-bridge module 111 to the load 140. For example, the current sampling module 123 may be a sampling resistor R7, through which the lower arm left bridge cell 111c is grounded and the lower arm right bridge cell 111d is grounded through the sampling resistor R7 and the sampling resistor R7. Since the sampling resistor R7 is connected in series with the branch of the patient load 140, the voltage value corresponding to the current output by the H-bridge module 111 to the patient load 140 can be collected to be 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 configured to amplify the current value collected by the current sampling module 123 and output the current value to the control circuit 130.

Fig. 5 is a circuit diagram of a voltage adjustment module according to an embodiment. The voltage adjustment module 112 in this embodiment comprises a BOOST circuit. As shown in fig. 5, 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 may be an NPN transistor. An 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 an anode of the first diode D1 and a collector of the first triode Q1, a base of the first triode Q1 is connected to the control circuit 130, an anode of the second energy-storage capacitor C2 is connected to a cathode of the first diode D1 and the H-bridge module 111, and a cathode of the first energy-storage capacitor C1, an emitter of the first triode Q1 and a cathode of the second energy-storage capacitor C2 are both connected to a ground terminal.

The voltage regulator circuit is controlled to boost the power supply voltage DC to output a voltage V _ STIM to the H-bridge circuit according to, for example, the PWM signal output by the control circuit 130 to the first transistor Q1.

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

The control circuit 130 inputs a predetermined current value I _ OUT _ DA to the non-inverting input of the first operational amplifier U1, and the detection circuit 120 inputs a current value I _ DET through the patient load 140 to the inverting input 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 selection switch S1, and the control signal L _ SEL of the control circuit 130 controls the output of the comparison signal to the second electrical connection terminal B or to the third electrical connection terminal C, thereby controlling the degree of conduction of the lower arm left bridge unit 111C or controlling the degree of conduction of the lower arm right bridge unit 111 d.

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

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

The lower arm left bridge unit 111c comprises a sixth triode Q6, the collector of the sixth triode Q6 is connected with the load 140, the emitter of the sixth triode Q4 is connected with the ground terminal, and the base of the sixth triode Q6 is connected with the second electrical connection terminal B of the selection switch S1;

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

For example, 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.

FIG. 8 is a circuit diagram of a first voltage detection module according to an embodiment. As shown in fig. 8, the first voltage detecting 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 divider resistor R1 and the second divider 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 divider resistor R1 and the second divider resistor R2 connected in series is connected to the ground. The 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, the inverting input terminal of the second operational amplifier U2 is connected to the output terminal of the second operational amplifier U2, and the output terminal of the second operational amplifier U2 is further connected to the control circuit 130.

The voltage CH + at one end of the load 140 (the voltage output by one of the electrode plates) is sampled by the first voltage dividing resistor R1 and the second voltage dividing resistor R2 and output to the homodromous input end of the second operational amplifier U2, and is amplified or attenuated by the second operational amplifier U2 to obtain a first voltage sampling signal CH + _ AD and output to the control circuit 130.

FIG. 9 is a circuit diagram of a second voltage detection module in an embodiment. As shown in fig. 9, the second voltage detecting 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. 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 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 further connected to the control circuit 130.

The third voltage dividing resistor R3 and the fourth voltage dividing resistor R4 are used to sample the voltage CH-at the other end of the load 140 (the voltage output by the other electrode slice) and output the sampled voltage CH-to the inverting input terminal of the third operational amplifier U3, and the sampled voltage CH-AD is obtained after the sampled voltage is amplified or attenuated by the third operational amplifier U3 and output to the control circuit 130.

FIG. 10 is a circuit diagram of a current detection module in an embodiment. As shown in fig. 10, the current detection module 124 includes a fourth operational amplifier U4, a first amplifying resistor R5 and a second amplifying resistor R6. The same-direction input end of the fourth operational amplifier U4 is connected to the current sampling module 123, the inverting input end of the fourth operational amplifier U4 is connected to the ground end through the first amplifying resistor R5, the inverting input end of the fourth operational amplifier U4 is further connected to the output end of the fourth operational amplifier U4 through the second amplifying resistor R6, and the output end of the fourth operational amplifier U4 is further connected to the control circuit 130.

Referring to fig. 7 and 10, the current sampling module 123 includes a sampling resistor R7, samples the current I _ DET output by the H-bridge module 111 to the patient load 140 by using the sampling resistor R7, and then amplifies the current I _ DET by the current detection module 124 in fig. 10, and finally outputs the current sampling signal I _ AD to the control circuit 130.

In one embodiment, the specific operation flow of the electrical stimulation circuit is as follows:

the control circuit 130, upon receiving the electrical stimulation output request, controls the electrical stimulation generation circuit 110 to output a test electrical stimulation pulse to the patient. Specifically, the control circuit 130 outputs a voltage value corresponding to a test current to the constant current control module 113 through PWM or DAC, and the output current value corresponding to the voltage value is small so as not to cause human body reaction. Meanwhile, the control circuit 130 controls the voltage adjustment module 112 to output a test voltage to the electrical stimulation generation circuit 110 through PWM or DAC, and the control circuit 130 also alternately switches and turns off the output of the bridge arms in the H-bridge module 111 according to the test frequency and the test pulse width. When the connection between the upper arm left bridge unit 111a and the enabling constant current control module 113 and the lower arm right bridge unit 111d is controlled to be turned on, and the connection between the upper arm right bridge unit 111b and the disabling constant current control module 113 and the lower arm left bridge unit 111c is turned off, 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, and obtains a voltage value and a current value loaded on the patient load 140 in the direction.

When the connection between the upper arm right bridge unit 111b and the enabling constant current control module 113 and the lower arm left bridge unit 111c is controlled to be turned on, and the connection between the upper arm left bridge unit 111a and the disabling constant current control module 113 and the lower arm right bridge unit 111d is turned off, 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, and obtains a voltage value and a current value loaded on the patient load 140 in the direction. Of course, only the detection of the unidirectional output voltage may be performed.

The control circuit 130 calculates an impedance value of the patient load 140 according to the current loaded to the patient load 140 and the voltage across the current, which are obtained by AD sampling, and determines whether the impedance value is within a preset impedance range, and performs multiple calculations to obtain a more accurate impedance value of the patient load 140 when calculating the impedance value of the patient load 140, for example, taking an 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. Alternatively, if the impedance value of the patient load 140 exceeds the predetermined impedance range, the load 140 is indicated to have poor contact, and if the impedance value of the patient load 140 is lower than the predetermined impedance range, the load 140 is indicated to be short-circuited.

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

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

the control circuit 130 outputs a voltage value corresponding to the preset current value I _ OUT _ DA to the constant current control module 113 through PWM or DAC. At the same time, control circuit 130 alternately switches and turns off the bridge arm outputs in H-bridge module 111 according to the received frequency pulse width (which is the frequency and pulse width of the electrical stimulation pulses used for treatment). When the connection of the upper arm left bridge unit 111a and the enabling constant current control module 113 with the lower arm right bridge unit 111d is controlled to be on, and the connection of the upper arm right bridge unit 111b and the disabling constant current control module 113 with the lower arm left bridge unit 111c is controlled to be off, the control circuit 130 performs AD sampling on the second voltage detection module 122 at the same time or according to a preset delay time, and obtains the voltage drop of the lower arm right bridge unit 111d in the direction. When the connection between the upper arm right bridge unit 111b and the enabling constant current control module 113 and the lower arm left bridge unit 111c is controlled to be on, and the connection between the upper arm left bridge unit 111a and the disabling constant current control module 113 and the lower arm right bridge unit 111d is controlled to be off, 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, and obtains the voltage drop of the lower arm left bridge unit 111c in the direction.

In the process of outputting the electrical stimulation pulse, the control circuit 130 controls the voltage adjustment module 112 to gradually increase the supply voltage V _ STIM of the H-bridge module 111 through PWM or DAC until it is detected that the voltage loaded across the patient load 140, i.e., the absolute value of the difference between the output voltages of the first voltage sampling module and the second voltage sampling unit, reaches the set voltage range, stops boosting and maintains the voltage output. In the subsequent electrical stimulation pulse output process, if the control circuit 130 determines that the voltage samples loaded at the two ends of the patient load 140 exceed the preset voltage range, the H-bridge module 111 is controlled to stop outputting the electrical stimulation pulse to the patient load 140 and prompt the load 140 to be short-circuited, and if the control circuit 130 determines that the voltage samples loaded at the two ends of the patient load 140 are lower than the preset voltage range, the H-bridge module 111 is controlled to stop outputting the electrical stimulation pulse to the patient load 140 and prompt the load 140 to be in poor contact.

When the control circuit 130 receives an adjustment command for adjusting the output preset current value, the voltage value corresponding to the adjusted preset current value is output to the constant current control module 113 through the PWM or DAC, and if the adjustment command is to increase the preset current value, the control circuit 130 controls the voltage adjustment module 112 to increase the power supply voltage of the H-bridge module 111 again until it is detected that the voltage samples loaded at the two ends of the patient load 140 are increased to the changed set voltage range, and the voltage boosting is stopped and the voltage output is maintained. If the adjustment command is to decrease the preset current value, the voltage adjustment module 112 is controlled to decrease the power supply voltage of the H-bridge module 111 until a set voltage range after the voltage sampling load applied to the two ends of the patient load 140 is detected to be decreased is detected, and the voltage reduction is stopped and the voltage output is maintained.

In the process of outputting the electrical stimulation pulse, the first voltage detection module 121, the second voltage detection module 122 and the current detection module 124 are also subjected to AD sampling to calculate the impedance value of the patient load 140, so that the current conditions of the patient load 140 and the electrical stimulation circuit are displayed 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 the electrical stimulation pulse to the patient and prompt that the load 140 is in poor contact, and if the control circuit 130 determines that the impedance value of the patient load 140 is lower than the preset impedance range, the H-bridge module 111 is controlled to stop outputting the electrical stimulation pulse to the patient and prompt that the load 140 is in short circuit.

Optionally, in the process of outputting the electrical stimulation pulse, 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, so as 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 determine whether the current flowing through the patient load 140 is consistent with a preset current value, and if any one of the power supply voltage, the control circuit controls the H-bridge module 111 to stop outputting the electrical stimulation pulse 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, and if a fault is found, the output of the electrical stimulation pulse to the patient is stopped, so that the safety of the patient can be further ensured.

The present application also provides an electrical stimulation therapy device. The electrical stimulation treatment device comprises a first electrode plate, a second electrode plate and an electrical stimulation circuit as in any one of the above embodiments. The electrical stimulation circuit outputs electrical stimulation pulses to the load 140 through the first and second electrode pads.

The application also provides a control device of the electrical stimulation circuit. As shown in fig. 11, a control device of an electrical stimulation circuit includes a control module 210 and an acquisition module 220. The control module 210 is 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; the obtaining module 220 is configured to obtain a voltage value and a current value output 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 output by the electrical stimulation circuit to the load; the control module 210 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 the preset impedance range.

In one embodiment, the control module 210 includes a first control unit and a second control unit. The first control unit is used for controlling the electrical stimulation circuit to output preset pulse current to the load; presetting the amplitude of the pulse current as a preset current value; the second control unit is used for 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.

In an embodiment, the control device of the electrical stimulation circuit further includes a determining module, where the determining module is configured to determine whether a voltage value output by the electrical stimulation circuit to the load is within a set voltage range and determine whether a current value output by the electrical stimulation circuit to the load is inconsistent with a preset current value, and the control module 210 is further configured to control the electrical stimulation circuit to stop outputting the electrical stimulation pulse to the load when any one of the voltage value output by the electrical stimulation circuit to the load is not within the set voltage range and the current value output by the electrical stimulation circuit to the load is inconsistent with the preset current value occurs.

In one embodiment, the control module 210 is further configured to receive an adjustment command; when the adjusting command is to increase the intensity of the electrical stimulation pulse, controlling the electrical stimulation circuit to adjust a preset pulse current output to the load, wherein the amplitude of the adjusted preset pulse current is an increased preset current value, and increasing the power supply voltage of the electrical stimulation circuit until the voltage output to the load by the electrical stimulation circuit reaches an 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 a 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 a reduced set voltage range.

Before the step of controlling the electrical stimulation circuit to output the electrical stimulation pulse to the load, the method further comprises the following steps:

in one embodiment, the control device of the electrical stimulation circuit further comprises a test module, wherein the test module is used for controlling the electrical stimulation circuit to output a test electrical stimulation pulse to the load; the obtaining module 220 is further configured to obtain a voltage value and a current value output by the electrical stimulation circuit to the load; the control module 210 is further configured to obtain an impedance value of the load according to a voltage value and a current value output by the electrical stimulation circuit to the load; and when the impedance value of the load is not in the preset impedance range, controlling the electrical stimulation circuit to stop outputting the test electrical stimulation pulse to the load.

In one embodiment, the control device of the electrical stimulation circuit further comprises an alarm module, the preset impedance range comprises an upper impedance limit and a lower impedance limit, and the alarm module is used for prompting that the load is in poor contact when the impedance value of the load exceeds the upper impedance limit; and when the impedance value of the load is lower than the lower impedance limit, indicating that the load is short-circuited.

The present application further provides a computer device comprising a memory and a processor; the processor has stored thereon a computer program which is executable on the processor, and the processor implements the steps of the method according to any of the above embodiments when executing the computer program.

The above-described method and system may be implemented in a computer device. The internal structure of the computer device is shown in fig. 12. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile 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 an operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement the steps of the control method of the electrical stimulation circuit in any of the preceding embodiments. Those skilled in the art will appreciate that the architecture shown in fig. 12 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.

In an embodiment, a storage medium has a computer program stored thereon. Which when executed by a processor implements the steps of any of the methods described above.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. 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 a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An electrical stimulation circuit, comprising: the device comprises an electric stimulation generating circuit, a detection circuit and a control circuit; the control circuit is connected with the electrical stimulation generating circuit and the detection circuit, and is used for controlling the electrical stimulation generating circuit to output electrical stimulation pulses to a load, and the amplitude of the current of the electrical stimulation pulses is equal to a preset current value;

2. The electrical stimulation circuit of claim 1, wherein the electrical stimulation generation circuit comprises:

3. The electrical stimulation circuit of claim 2, wherein the voltage adjustment module comprises a first energy storage capacitor, a second energy storage capacitor, an inductor, a first triode, and a first diode; the positive pole of first energy storage capacitor with the one end of inductance all is connected with the power, the other end of inductance with the positive pole of first diode with the collecting electrode of first triode is connected, the base of first triode with control circuit connects, the positive pole of second energy storage capacitor with the negative pole of first diode with the H bridge module is connected, the negative pole of first energy storage capacitor, the projecting pole of first triode and the negative pole of second energy storage capacitor all with the earthing terminal is connected.

4. The electrical stimulation circuit of claim 2, wherein the constant current control module comprises a first operational amplifier and a selection switch; the same-direction input end of the first operational amplifier is connected with the control circuit, and the reverse-direction input end of the first operational amplifier is connected with the detection circuit; the first electric connection end of the selection switch is connected with the output end of the first operational amplifier and the control circuit, the second electric connection end of the selection switch is connected with the lower arm left bridge unit, and the third electric connection end of the selection switch is connected with the lower arm right bridge unit.

5. The electrical stimulation circuit of claim 4, wherein the upper arm right bridge unit comprises a second transistor and a fifth transistor, wherein an emitter of the second transistor is connected to the voltage regulation module, a collector of the second transistor is connected to the load, a base of the second transistor is connected to a collector of the fifth transistor, an emitter of the fifth transistor is connected to the ground terminal, and a base of the fifth transistor is connected to the control circuit;

6. An electro-stimulation circuit as claimed in claim 2, wherein the detection circuit comprises:

7. The electrical stimulation circuit of claim 6, wherein the first voltage detection module comprises a second operational amplifier, a first voltage dividing resistor, and a second voltage dividing resistor; one end of the first voltage-dividing resistor and one end of the second voltage-dividing resistor after being connected in series are 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 after being connected in series are connected with 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 reverse-direction input end of the second operational amplifier is connected with the output end of the second operational amplifier, and the output end of the second operational amplifier is further connected with the control circuit.

8. The electrical stimulation circuit of claim 7, wherein the second voltage detection module comprises a third operational amplifier, a third voltage dividing resistor, and a fourth voltage dividing resistor; one end of the third voltage dividing resistor and one end of the fourth voltage dividing resistor after being connected in series are 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 other end of the fourth voltage dividing resistor after being connected in series are connected with 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 homodromous input end of the third operational amplifier is connected with the output end of the third operational amplifier, and the output end of the third operational amplifier is further connected with the control circuit.

9. The electrical stimulation circuit of claim 7, wherein the current detection module comprises a fourth operational amplifier, a first amplifying resistor, and a second amplifying resistor; the homodromous input end of the fourth operational amplifier is connected with the current sampling module, the reverse input end of the fourth operational amplifier is connected with the grounding end through the first amplifying resistor, the reverse input end of the fourth operational amplifier is connected with the output end of the fourth operational amplifier through the second amplifying resistor, and the output end of the fourth operational amplifier is connected with the control circuit.

10. An electrostimulation therapy device, comprising a first electrode pad, a second electrode pad and an electrostimulation circuit according to any of claims 1 to 9, which outputs the electrostimulation pulses to the load via the first and second electrode pads.

11. A method of controlling an electrical stimulation circuit, comprising:

controlling the electrical stimulation circuit to output electrical stimulation pulses to the load; the current amplitude value of the electric stimulation pulse is equal to a preset current value;

12. The method of claim 11, wherein the step of controlling the electrical stimulation circuit to output electrical stimulation pulses to the load comprises:

controlling an electrical stimulation circuit to output preset pulse current to the load; the amplitude value of the preset pulse current is the preset current value;

13. The method of claim 12, wherein the step of controlling the electrical stimulation circuit to output electrical stimulation pulses to the load is followed by the step of:

14. The method of claim 12, wherein the step of controlling the electrical stimulation circuit to output electrical stimulation pulses to the load is followed by the step of:

receiving an adjustment command;

when the adjusting command is to increase the intensity of the electrical stimulation pulse, adjusting the preset pulse current output to the load, wherein the amplitude of the adjusted preset pulse current is an increased preset current value, and increasing the power supply voltage of the electrical stimulation circuit until the voltage output to the load by the electrical stimulation circuit reaches an increased set voltage range;

and when the adjusting command is to reduce the intensity of the electrical stimulation pulse, adjusting the preset pulse current output to the load, wherein the amplitude of the adjusted preset pulse current is a reduced preset current value, and reducing the power supply voltage of the electrical stimulation circuit until the voltage output to the load by the electrical stimulation circuit reaches a reduced set voltage range.

15. The method of claim 11, wherein the step of controlling the electrical stimulation circuit to output electrical stimulation pulses to the load is preceded by the step of:

controlling the electrical stimulation circuit to output a test electrical stimulation pulse to the load;

16. The control method of an electrical stimulation circuit according to claim 11 or 15, wherein the preset impedance range includes an upper impedance limit and a lower impedance limit; the control method of the electrical stimulation circuit further comprises:

when the impedance value of the load exceeds the upper impedance limit, indicating that the load is in poor contact;

and when the impedance value of the load is lower than the lower impedance limit, prompting the load to be short-circuited.

17. A control device for an electrical stimulation circuit, comprising: