An open-circuit detection circuit for electrical stimulation

Abstract

The present application discloses an open-circuit detection circuit for electrical stimulation, which includes a first voltage acquisition circuit, a second voltage acquisition circuit, an isolation transformer, and a processor; the first voltage acquisition circuit is connected in series with the electrode patch for acquiring voltage; the primary coil of the isolation transformer is connected in parallel with the first voltage acquisition circuit, and the secondary coil of the isolation transformer is connected in parallel with the second voltage acquisition circuit, which is used for isolating and amplifying the voltage acquired by the first voltage acquisition circuit and forming an electric potential at both ends of the second voltage acquisition circuit; the positive electrode of the second voltage acquisition circuit is connected to the processor for outputting a voltage signal to the processor; the processor is used for obtaining the state of the electrode patch according to the voltage signal. This open-circuit detection circuit for electrical stimulation can accurately and reliably identify whether the electrode patch falls off during the treatment process.

Description

Technical Field

[0001] The present application relates to the field of circuit technology, and in particular to an electrical stimulation open circuit detection circuit. Background Art

[0002] For electrical stimulation products, when the treatment electrode sheet leaves the treatment area of the human body due to contact problems, a very high voltage will be generated. As a result, when the treatment electrode sheet re-contacts the treatment area, an electric shock will occur, giving the patient a poor treatment experience. In response to the above situation, some electrical stimulation products currently have an output indication function, which can be roughly divided into two categories: one is the output indication as an output indicator light, and the other is the flashing of a specific output identifier on the display screen to indicate that electrical stimulation is being output, to remind the patient using electrical stimulation. Among them, the technical solution of indicating the output status on the display screen with a specific identifier, because the flashing of the output indicator on the screen is controlled by the MCU, even if the electrode sheet falls off, the display screen will still flash, and thus it has no warning effect at all. In addition, the technical solution of connecting the output indicator light in series with the output circuit will directly extinguish when the electrode sheet falls off, but using this method to drive the indicator light requires a driving current. Otherwise, the brightness of the output indicator light is too low or remains off. That is, the electrical stimulation needs to reach a certain level before it can be effective, and when the output intensity is too low, it has no indication effect at all.

[0003] In view of this, how to improve the accuracy and reliability of electrical stimulation open circuit detection has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this application is to provide an electrical stimulation open circuit detection circuit that can accurately and reliably identify whether an electrode sheet has fallen off during treatment.

[0005] To solve the above technical problems, the present application provides an electrical stimulation open circuit detection circuit, comprising:

[0006] A first voltage acquisition circuit, a second voltage acquisition circuit, an isolation transformer, and a processor;

[0007] The first voltage collection circuit is connected in series with the electrode sheet for collecting voltage;

[0008] The primary coil of the isolation transformer is connected in parallel with the first voltage acquisition circuit, and the secondary coil of the isolation transformer is connected in parallel with the second voltage acquisition circuit, so as to isolate and amplify the voltage collected by the first voltage acquisition circuit and form a potential at both ends of the second voltage acquisition circuit;

[0009] The second voltage acquisition circuit is connected to the processor and is used to output a voltage signal to the processor;

[0010] The processor is configured to obtain the state of the electrode sheet based on the voltage signal.

[0011] Optionally, the first voltage acquisition circuit includes a first resistor, and the second voltage acquisition circuit includes a second resistor.

[0012] Optionally, it further includes:

[0013] An amplification circuit; the input end of the amplification circuit is connected to the positive electrode of the second voltage acquisition circuit, and the output end of the amplification circuit is connected to the processor.

[0014] Optionally, the amplification circuit includes:

[0015] The non-inverting input terminal of the operational amplifier is connected to the positive electrode of the second voltage acquisition circuit after being connected in series with the third resistor, the inverting input terminal of the operational amplifier is grounded after being connected in series with the fourth resistor and is connected to the output terminal of the operational amplifier after being connected in series with the fifth resistor, the positive power supply terminal and the negative power supply terminal of the operational amplifier are respectively connected to the positive and negative power supplies and are respectively grounded after being connected in series with the first capacitor and the second capacitor, and the output terminal of the operational amplifier is connected to the processor.

[0016] Optionally, it further includes:

[0017] A rectifying diode; the rectifying diode is connected in series with the second voltage acquisition circuit.

[0018] Optionally, when the processor obtains that the electrode sheet is in a detached state based on the voltage signal, the processor is further configured to stop outputting electrical stimulation.

[0019] Optionally, after the duration of stopping outputting electrical stimulation reaches a preset duration, the processor is further configured to resume outputting electrical stimulation, and when it is detected that the electrode sheet resumes contact with the patient, the intensity of the electrical stimulation is increased step by step at a preset time interval until it is consistent with the intensity of the electrical stimulation before the electrode sheet detachment.

[0020] Optionally, after resuming outputting electrical stimulation, if the electrode sheet is still in a detached state, the processor is further configured to activate an alarm device to give an alarm.

[0021] Optionally, the processor is specifically a single-chip microcomputer.

[0022] Optionally, the alarm device is specifically a buzzer.

[0023] The open-circuit detection circuit for electrical stimulation provided in this application includes: a first voltage acquisition circuit, a second voltage acquisition circuit, an isolation transformer, and a processor; the first voltage acquisition circuit is connected in series with the electrode patch for acquiring voltage; the primary coil of the isolation transformer is connected in parallel with the first voltage acquisition circuit, and the secondary coil of the isolation transformer is connected in parallel with the second voltage acquisition circuit, which is used for isolating and amplifying the voltage acquired by the first voltage acquisition circuit and forming an electric potential across the second voltage acquisition circuit; the second voltage acquisition circuit is connected to the processor for outputting a voltage signal to the processor; the processor is used for obtaining the state of the electrode patch based on the voltage signal.

[0024] It can be seen that for the open-circuit detection circuit for electrical stimulation provided in this application, a first voltage acquisition circuit is set to acquire voltage in the loop where the electrode patch is located. In addition, an isolation transformer is set to isolate the voltage of the electrical stimulation from the voltage of the control circuit, effectively avoiding the control system from being damaged by the output voltage of the electrical stimulation. Secondly, the isolation transformer can also amplify the signal of the voltage of the first voltage acquisition circuit, effectively avoiding the problem that the original signal is too small to cause inaccurate detection by the processor, and greatly improving the accuracy and reliability of the open-circuit detection of electrical stimulation. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of this application, the drawings required for the prior art and the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 It is a schematic diagram of an open-circuit detection circuit for electrical stimulation provided in an embodiment of this application;

[0027] Figure 2 It is a schematic diagram of another open-circuit detection circuit for electrical stimulation provided in an embodiment of this application. Detailed Embodiments

[0028] The core of this application is to provide an open-circuit detection circuit for electrical stimulation, which can accurately and reliably identify whether the electrode patch falls off during the treatment process.

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this application without creative efforts fall within the scope of protection of this application.

[0030] Please refer to Figure 1 , Figure 1 which is a schematic diagram of an electrical stimulation open - circuit detection circuit provided by an embodiment of the present application. As shown in Figure 1 , the electrical stimulation open - circuit detection circuit includes:

[0031] A first voltage acquisition circuit 10, a second voltage acquisition circuit 20, an isolation transformer T, and a processor 30;

[0032] The first voltage acquisition circuit 10 is connected in series with the electrode patch and is used to acquire voltage;

[0033] The primary coil of the isolation transformer T is connected in parallel with the first voltage acquisition circuit 10, and the secondary coil of the isolation transformer T is connected in parallel with the second voltage acquisition circuit 20, which is used to isolate and amplify the voltage acquired by the first voltage acquisition circuit 10 and form an electric potential across the second voltage acquisition circuit 20;

[0034] The second voltage acquisition circuit 20 is connected to the processor 30 and is used to output a voltage signal to the processor 30;

[0035] The processor 30 is used to obtain the state of the electrode patch based on the voltage signal.

[0036] Specifically, the electrical stimulation open - circuit detection circuit provided by the present application mainly includes a first voltage acquisition circuit 10, a second voltage acquisition circuit 20, an isolation transformer T, and a processor 30. Among them, the first voltage acquisition circuit 10 is connected in series in the loop where the electrode patch is located and is responsible for acquiring voltage. During the treatment process, when the electrode patch falls off, that is, when the electrode patch is not in contact with the patient, the voltage that the first voltage acquisition circuit 10 can acquire is zero. When the electrode patch does not fall off, that is, when the electrode patch is in normal contact with the patient, the voltage that the first voltage acquisition circuit 10 can acquire is non - zero.

[0037] The primary coil of the isolation transformer T is connected in parallel with the first voltage acquisition circuit 10, and the secondary coil of the isolation transformer T is connected in parallel with the second voltage acquisition circuit 20. On the one hand, the isolation transformer T can play an isolation role, isolating the voltage of the electrical stimulation from the voltage of the control circuit, so as to avoid the electrical stimulation output voltage from damaging the control system by electric shock. On the other hand, the isolation transformer T is also used to amplify the voltage acquired by the first voltage acquisition circuit 10 and form an electric potential across the second voltage acquisition circuit 20. Naturally, if the voltage acquired by the first voltage acquisition circuit 10 is zero, the electric potential formed by the isolation transformer across the second voltage acquisition circuit 20 is also zero; if the voltage acquired by the first voltage acquisition circuit 10 is non - zero, the electric potential formed by the isolation transformer across the second voltage acquisition circuit 20 is also non - zero.

[0038] The second voltage acquisition circuit 20 is connected to the processor 30 and is used to output a voltage signal to the processor 30 so that the processor 30 can obtain the state of the electrode plate based on this voltage signal. When the electrode plate falls off, the voltage signal output by the second voltage acquisition circuit 20 is zero. When the electrode plate does not fall off, the voltage signal output by the second voltage acquisition circuit 20 is non-zero. Thus, the processor 30 can determine whether the electrode plate has fallen off based on whether the received voltage signal is zero.

[0039] Among them, in a specific implementation manner, the first voltage acquisition circuit 10 includes a first resistor R1, and the second voltage acquisition circuit 20 includes a second resistor R2.

[0040] Reference Figure 2 As shown, in this embodiment, both the first voltage acquisition circuit 10 and the second voltage acquisition circuit 20 adopt relatively simple circuit designs. The first resistor R1 is connected in series in the loop where the electrode plate is located as the first voltage acquisition circuit 10. After the electrical stimulation is turned on, if the electrode plate is in normal contact with the patient, then at this time, the current flows through the first resistor R1, and a potential difference is formed across the two ends of the first resistor R1, and the voltage collected by the first resistor R1 is non-zero; on the contrary, after the electrical stimulation is turned on, if the electrode plate is not in contact with the patient, then at this time, no current flows through the first resistor R1, so the voltage collected by the first resistor R1 is zero. The primary coil of the isolation transformer T is connected in parallel with the first resistor R1, and the secondary coil is connected in parallel with the second resistor R2. Similarly, after the electrical stimulation is turned on, if the electrode plate is in normal contact with the patient, the voltage collected by the first resistor R1 forms a non-zero potential across the two ends of the second resistor R2 after being amplified by the isolation transformer T. If the electrode plate is not in contact with the patient, the voltage collected by the first resistor R1 is zero, and the potential formed across the two ends of the second resistor R2 after being amplified by the isolation transformer T is also zero.

[0041] The processor 30 is connected to the second voltage acquisition circuit 20, specifically connected to the positive electrode of the second voltage acquisition circuit, and is used to obtain the state of the electrode plate based on the voltage signal output by the second voltage acquisition circuit 20. Specifically, if the voltage signal output by the second voltage acquisition circuit 20 is zero, it is determined that the electrode plate has fallen off. If the voltage signal output by the second voltage acquisition circuit 20 is non-zero, it is determined that the electrode plate is in normal contact and has not fallen off.

[0042] Since the equivalent load of the human body in electrical stimulation is 500 ohms, when the electrical stimulation signal is small, although the voltage signal generated across the second resistor R2 is amplified by the isolation transformer T, it may still be relatively small. If the processor 30 directly samples it, not only will the sampled signal value be small, but it will also be very unstable and vulnerable to external environmental factors that cause interference signals, affecting the accuracy of the sampling. Therefore, in order to further ensure the effective and reliable implementation of the electrode patch state detection, in a specific embodiment, the electrical stimulation open - circuit detection circuit further includes an amplifier circuit; the input end of the amplifier circuit is connected to the second voltage acquisition circuit 20, and the output end of the amplifier circuit is connected to the processor 30.

[0043] Specifically, in this embodiment, the electrical stimulation open - circuit detection circuit is also provided with an amplifier circuit. The input end of this amplifier circuit is connected to the positive pole of the second voltage acquisition circuit 20, and the output end is connected to the processor 30, so as to amplify the voltage signal collected by the second voltage acquisition circuit 20 through this amplifier circuit and then let the processor read it to ensure the accuracy of the signal.

[0044] Among them, referring to Figure 2 As shown, as a specific embodiment, the amplifier circuit includes an operational amplifier, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, and a second capacitor C2; the non - inverting input terminal of the operational amplifier is connected to the positive pole of the second voltage acquisition circuit 20 after being connected in series with the third resistor R3. The inverting input terminal of the operational amplifier is grounded after being connected in series with the fourth resistor R4 and is connected to the output terminal of the operational amplifier after being connected in series with the fifth resistor R5. The positive power supply terminal and the negative power supply terminal of the operational amplifier are respectively connected to the positive and negative power supplies and are respectively grounded after being connected in series with the first capacitor C1 and the second capacitor C2. The output terminal of the operational amplifier is connected to the processor 30. That is, in this embodiment, the amplifier circuit specifically adopts a positive - type amplifier circuit to amplify the voltage signal by using this positive - type amplifier circuit. Among them, a resistor can be connected in series at the output terminal of the operational amplifier and then connected to the processor 30. In addition, the end of this resistor connected to the processor 30 can also be connected to a reverse diode, specifically connecting the cathode of the reverse diode, and the anode of the reverse diode is grounded, so as to play a role in protecting the processor 30.

[0045] Furthermore, on the basis of the above - mentioned embodiment, as a specific embodiment, the electrical stimulation open - circuit detection circuit further includes:

[0046] A rectifier diode D; the rectifier diode D is connected in series with the second voltage acquisition circuit 20.

[0047] Specifically, referring to Figure 2As shown in the figure, for the case where the electrical stimulation is a medium-frequency wave, since the medium-frequency wave belongs to a bidirectional symmetric wave, in this embodiment, the electrical stimulation open-circuit detection circuit is further provided with a rectifying diode D, which is connected in series with the second voltage acquisition circuit 20. For the case where the second voltage acquisition circuit 20 is a resistor, that is, the rectifying diode D is connected in series with the second resistor R2, and is used to rectify the signal output by the secondary coil of the isolation transformer T.

[0048] Further, on the basis of the above embodiment, as a specific implementation manner, the processor 30 is further configured to stop outputting electrical stimulation when it is analyzed that the electrode patch is in a detached state according to the voltage signal.

[0049] Specifically, on the basis of analyzing the voltage signal and determining that the electrode patch is in a detached state, that is, when the electrode patch is not in contact with the patient's body, the processor 30 can further control the electrical stimulation driver to stop outputting electrical stimulation.

[0050] In addition, on the basis of the above embodiment, as a specific implementation manner, after the processor 30 stops outputting electrical stimulation for a preset duration, it resumes outputting electrical stimulation, and when it detects that the electrode patch resumes contact with the patient, it increases the intensity of the electrical stimulation step by step at a preset time interval until it is consistent with the electrical stimulation intensity before the electrode patch detachment.

[0051] Specifically, in this embodiment, after the processor 30 analyzes the voltage signal to determine that the electrode patch is in a detached state and controls the electrical stimulation driver to stop outputting electrical stimulation, when the duration of stopping outputting electrical stimulation reaches the preset duration, the processor 30 will further resume outputting electrical stimulation, and when it detects that the electrode patch resumes contact with the patient, it increases the intensity of the electrical stimulation step by step at a preset time interval until it is consistent with the electrical stimulation intensity before the electrode patch detachment.

[0052] In this embodiment, after detecting that the electrode patch is detached, in addition to stopping outputting electrical stimulation, it is also provided with an automatic recovery output ability, making the electrical stimulation open-circuit detection circuit more convenient and user-friendly.

[0053] For the specific values of the above preset duration and preset time interval, the present application does not make specific limitations, and can be set differently according to actual application needs.

[0054] Further, on the basis of the above embodiment, as a specific implementation manner, after the processor 30 resumes outputting electrical stimulation, if the electrode patch is still in a detached state, it starts an alarm device to give an alarm.

[0055] Specifically, in this embodiment, after the processor 30 analyzes the voltage signal to determine that the electrode patch is in a detached state, controls the electrostimulation driver to stop outputting electrostimulation, and when the duration of stopping the output of electrostimulation reaches a preset duration and the output of electrostimulation is restored, if the electrode patch is still in a detached state, the processor 30 activates the alarm device to give an alarm to prompt the user to check whether the electrode patch is in good contact.

[0056] Similarly, for the specific types of the processor 30 and the alarm device, the present application does not make specific limitations, and appropriate settings can be made according to actual needs.

[0057] In a specific implementation manner, the processor 30 can specifically be a single-chip microcomputer, and the alarm device can be a buzzer. That is, when the output of electrostimulation is restored, if the electrode patch is still in a detached state, the buzzer sounds an alarm.

[0058] In summary, the electrostimulation open-circuit detection circuit provided by the present application includes: a first voltage acquisition circuit, a second voltage acquisition circuit, an isolation transformer, and a processor; the first voltage acquisition circuit is connected in series with the electrode patch for acquiring voltage; the primary coil of the isolation transformer is connected in parallel with the first voltage acquisition circuit, and the secondary coil of the isolation transformer is connected in parallel with the second voltage acquisition circuit for isolating and amplifying the voltage acquired by the first voltage acquisition circuit and forming an electric potential at both ends of the second voltage acquisition circuit; the second voltage acquisition circuit is connected to the processor for outputting a voltage signal to the processor; the processor is used for obtaining the state of the electrode patch according to the voltage signal. In this electrostimulation open-circuit detection circuit, the first voltage acquisition circuit is set to acquire voltage in the loop where the electrode patch is located. In addition, an isolation transformer is set to isolate the voltage of the electrostimulation from the voltage of the control circuit, effectively preventing the electrostimulation output voltage from damaging the control system by electric shock. Secondly, the isolation transformer can also be used to amplify the voltage signal of the first voltage acquisition circuit, effectively avoiding the problem that the original signal is too small to cause inaccurate detection by the processor, and greatly improving the accuracy and reliability of the electrostimulation open-circuit detection.

[0059] Due to the complex situation and inability to list and elaborate one by one, those skilled in the art should be able to realize that under the basic principle of the embodiments provided by the present application, multiple examples can exist in combination with the actual situation. Without sufficient creative labor, they should all fall within the scope of the present application.

[0060] The various embodiments in the specification are described in a progressive manner. The key points of each embodiment are the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0061] The above has introduced in detail the open-circuit detection circuit for electric stimulation provided in this application. Specific examples are used in this text to elaborate on the principle and implementation manner of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application. It should be noted that for those of ordinary skill in the art, without departing from the principle of this application, several improvements and modifications can be made to this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0062] It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the element.

Claims

1. An open-circuit detection circuit for electric stimulation, characterized in that, Including: A first voltage acquisition circuit, a second voltage acquisition circuit, an isolation transformer, and a processor; the first voltage acquisition circuit includes a first resistor, and the second voltage acquisition circuit includes a second resistor; the processor is specifically a single-chip microcomputer; The first voltage acquisition circuit is connected in series with the electrode patch for acquiring voltage; The primary coil of the isolation transformer is connected in parallel with the first voltage acquisition circuit, and the secondary coil of the isolation transformer is connected in parallel with the second voltage acquisition circuit, for isolating and amplifying the voltage acquired by the first voltage acquisition circuit and forming an electric potential across the second voltage acquisition circuit; The second voltage acquisition circuit is connected to the processor for outputting a voltage signal to the processor; The processor is used for obtaining the state of the electrode patch according to the voltage signal; It further includes: a rectifier diode; the rectifier diode is connected in series with the second voltage acquisition circuit; The processor is further used for stopping outputting electrical stimulation when it is obtained according to the voltage signal that the electrode patch is in a detached state; after the duration of stopping outputting electrical stimulation reaches a preset duration, resuming outputting electrical stimulation, and when it is detected that the electrode patch resumes contact with the patient, increasing the intensity of the electrical stimulation step by step at a preset time interval until it is consistent with the electrical stimulation intensity before the electrode patch detachment; when resuming outputting electrical stimulation, if the electrode patch is still in a detached state, starting an alarm device for alarm; the alarm device is specifically a buzzer; It further includes: an amplifier circuit; the input end of the amplifier circuit is connected to the second voltage acquisition circuit, and the output end of the amplifier circuit is connected to the processor; The amplifier circuit includes: An operational amplifier, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, and a second capacitor; The non-inverting input end of the operational amplifier is connected to the positive electrode of the second voltage acquisition circuit after being connected in series with the third resistor, the inverting input end of the operational amplifier is grounded after being connected in series with the fourth resistor and is connected to the output end of the operational amplifier after being connected in series with the fifth resistor, the positive power supply end and the negative power supply end of the operational amplifier are respectively connected to the positive and negative power supplies and are respectively grounded after being connected in series with the first capacitor and the second capacitor, and the output end of the operational amplifier is connected to the processor.

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