Protection circuit and physiotherapy instrument

Abstract

The utility model provides a protection circuit and a physiotherapy instrument, the protection circuit comprises a protection trigger circuit, a stimulation current output circuit and a first controllable switch, the input end of the stimulation current output circuit is connected with an upper computer, and the output end of the stimulation current output circuit is connected with an electrical stimulation part; the stimulation current output circuit is used for outputting according to the preset stimulation current of the upper computer, so that the electrical stimulation component outputs according to the preset stimulation current; the input end of the protection trigger circuit is connected with high voltage, and the output end of the protection trigger circuit is connected with the first controllable switch; the input end of the first controllable switch is connected with the protection trigger circuit, and the output end of the first controllable switch is connected with the electrical stimulation component; the protection trigger circuit is used for driving the first controllable switch to be turned off when the stimulation current exceeds a preset threshold value, so that the electrical stimulation component does not output the stimulation current any more. According to the protection circuit provided by the embodiment of the invention, the safety of the circuit is improved.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and specifically relates to a protection circuit and a physiotherapy apparatus. Background Art

[0002] A physiotherapy apparatus is a common physical therapy instrument that can generate a certain current to stimulate the human nerves and muscles, thereby achieving a therapeutic effect. It can usually help with pain treatment and can also promote muscle rehabilitation and nerve rehabilitation.

[0003] Due to abnormal damage to the stimulation cable or control circuit, there is still a risk of excessive output current. Therefore, most current stimulation systems have the following problem: lack of overcurrent protection function in case of abnormal damage to the stimulation cable.

[0004] Therefore, there is an urgent need for an electrical stimulation device to detect and protect abnormal current to improve the safety of the electrical stimulation device. Utility Model Content

[0005] In view of this, this application provides a protection circuit and a physiotherapy apparatus, which can limit and protect the current when the current is abnormal, and improve the safety of the physiotherapy apparatus.

[0006] To achieve the above object, this application provides the following technical solutions:

[0007] In a first aspect, this application provides a protection circuit, including: a protection trigger circuit, a stimulation current output circuit, and a first controllable switch. Among them, the input end of the stimulation current output circuit is connected to the host computer, the output end of the stimulation current output circuit is connected to the electrical stimulation component, and the stimulation current output circuit is used to output according to the preset stimulation current of the host computer, so that the electrical stimulation component outputs according to the preset stimulation current;

[0008] The input end of the protection trigger circuit is connected to a high voltage, and the output end of the protection trigger circuit is connected to the first controllable switch;

[0009] The input end of the first controllable switch is connected to the protection trigger circuit, and the output end of the first controllable switch is connected to the electrical stimulation component; the protection trigger circuit is used to drive the first controllable switch to turn off when the stimulation current exceeds the preset threshold, so that the electrical stimulation component no longer outputs the stimulation current.

[0010] In an optional implementation manner, the protection trigger circuit includes a current sampling circuit and a first triode,

[0011] The input end of the first triode is connected to a high voltage, and the output end of the first triode is connected to the first controllable switch through a fifth resistor;

[0012] The current sampling circuit includes a sixth resistor. The input end of the sixth resistor is connected to a high voltage, and the output end of the sixth resistor is connected to a first controllable switch. The current sampling circuit is used to detect the stimulation current flowing through the sixth resistor and drive the first triode to conduct when the stimulation current is greater than a preset value. When the first triode conducts, the first controllable switch is turned off.

[0013] In an alternative embodiment, the stimulation current output circuit includes a second amplifier circuit and a constant current circuit. Among them, the input end of the second amplifier circuit is connected to the host computer, the output end of the second amplifier circuit is connected to the constant current circuit, and the second amplifier circuit is used to receive the preset stimulation current sent by the host computer and amplify the stimulation current and then output it to the constant current circuit.

[0014] The input end of the constant current circuit is connected to the second amplifier circuit, and the output end of the constant current circuit is connected to the electrostimulation component. The constant current circuit is used to stabilize the stimulation current.

[0015] In an alternative embodiment, the constant current circuit includes a second triode, an eighth resistor, a ninth resistor, and a tenth resistor. Among them, the base of the second triode is connected to the ninth resistor, the collector of the second triode is connected to the electrostimulation component through a seventh resistor, and the emitter of the second triode is grounded through the eighth resistor.

[0016] One end of the ninth resistor is connected to the base of the second triode, and the other end of the ninth resistor is connected to the second amplifier circuit.

[0017] One end of the tenth resistor is connected to the emitter of the second triode, and the other end of the tenth resistor is connected to the second amplifier circuit.

[0018] In an alternative embodiment, the circuit further includes: a controllable switch control circuit. The input end of the controllable switch control circuit is connected to the host computer, and the output end of the controllable switch control circuit is connected to the first controllable switch.

[0019] The controllable switch control circuit is used to receive a pulse voltage to control the first controllable switch to turn on or off.

[0020] In an alternative embodiment, the controllable switch control circuit includes: a voltage dividing circuit and a second controllable switch.

[0021] The input end of the voltage dividing circuit is connected to the pulse voltage, and the output end of the voltage dividing circuit is connected to the first controllable switch through a fourth resistor.

[0022] The voltage dividing circuit divides the voltage through the voltage dividing resistor to provide an opening voltage for the second controllable switch, so that the second controllable switch conducts when receiving a low level or turns off when receiving a high level.

[0023] In an alternative embodiment, the circuit further includes: a current monitoring circuit, the input end of the current monitoring circuit is connected to the electrical stimulation component, and the output end of the current monitoring circuit is connected to the host computer; the electrical stimulation component is used to directly contact the skin to stimulate the part to be physiotherapied through a stimulation current;

[0024] The current monitoring circuit is used to monitor the stimulation current of the electrical stimulation component and output the stimulation current to the host computer, so that the host computer can judge whether the stimulation current is within a preset range.

[0025] In an alternative embodiment, the current monitoring circuit includes a current sensing circuit and a first amplifier circuit.

[0026] The input end of the current sensing circuit is connected to the electrical stimulation component, the output end of the current sensing circuit is connected to the first amplifier circuit, the current sensing circuit is used to monitor the stimulation current of the electrical stimulation component, and after amplifying the stimulation current through the first amplifier circuit, output it to the host computer.

[0027] In an alternative embodiment, the current sensing circuit includes a sensing resistor, one end of the sensing resistor is connected to the electrical stimulation component, and the other end of the sensing resistor is connected to the first amplifier circuit.

[0028] In a second aspect, an embodiment of the present application provides a physiotherapeutic apparatus, including the protection circuit according to the first aspect or any one of the embodiments of the first aspect.

[0029] The protection circuit and the physiotherapeutic apparatus provided by the embodiments of the present application output the stimulation current preset by the host computer to the electrical stimulation component through the stimulation current output circuit. When the stimulation current flowing through the electrical stimulation component exceeds the preset threshold, the first controllable switch is driven to turn off. Since the output end of the first controllable switch is connected to the electrical stimulation component, when the first controllable switch turns off, the stimulation current flowing through the electrical stimulation component can be effectively cut off, avoiding harm to the human body and improving the safety of the device. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0031] Figure 1 It is the structural block diagram of the protection circuit provided by the embodiment of the present application;

[0032] Figure 2 It is the circuit topology diagram of a protection circuit provided by the embodiment of the present application;

[0033] Figure 3Another circuit topology diagram of the protection circuit provided by the embodiment of the present application. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0035] A physiotherapy instrument is a common physical therapy instrument, which can generate a certain current to stimulate the human nerves and muscles, so as to achieve a therapeutic effect. It can usually help with pain treatment and also promote muscle rehabilitation and nerve rehabilitation. Due to the abnormal damage of the stimulation cable or the control circuit, there is still a risk of excessive output current. Therefore, most current stimulation systems have the following problems: lack of overcurrent protection function under abnormal damage of the stimulation cable.

[0036] The embodiment of the present application provides a protection circuit, which outputs the stimulation current preset by the host computer to the electrostimulation component through the stimulation current output circuit 20. When the stimulation current flowing through the electrostimulation component exceeds the preset threshold, the first controllable switch 30 is driven to turn off. Since the output end of the first controllable switch 30 is connected to the electrostimulation component, when the first controllable switch 30 turns off, the stimulation current flowing through the electrostimulation component can be effectively cut off, avoiding harm to the human body and improving the safety of the device.

[0037] Based on the above content, refer to Figure 1 , Figure 1 which is a structural block diagram of a protection circuit provided by the embodiment of the present application. The embodiment of the present application provides a protection circuit, which may include: a protection trigger circuit 10, a stimulation current output circuit 20, and a first controllable switch 30. Among them, the input end of the stimulation current output circuit 20 is connected to the host computer ( Figure 1 not shown in the figure), the output end of the stimulation current output circuit 20 is connected to the electrostimulation component ( Figure 1 not shown in the figure), and the stimulation current output circuit 20 is used to output according to the preset stimulation current of the host computer, so that the electrostimulation component outputs according to the preset stimulation current; the input end of the protection trigger circuit 10 is connected to a high voltage, and the output end of the protection trigger circuit 10 is connected to the first controllable switch 30; the input end of the first controllable switch 30 is connected to the protection trigger circuit 10, and the output end of the first controllable switch 30 is connected to the electrostimulation component; the protection trigger circuit 10 is used to drive the first controllable switch 30 to turn off when the stimulation current exceeds the preset threshold, so that the electrostimulation component no longer outputs the stimulation current.

[0038] In practical applications, the host computer can set different stimulation currents according to different parts to be physiotherapically treated, so as to output to the stimulation current output circuit 20, and output to the electrostimulation component through the stimulation current output circuit 20, and treat the part to be physiotherapically treated through the electrostimulation component.

[0039] The electrostimulation component can be an electrode. The electrode can transmit the stimulation current to the human body through close contact with the skin, so as to achieve various therapeutic effects such as relieving pain, promoting blood circulation, relaxing muscles or strengthening muscle contraction.

[0040] The first controllable switch 30 can be a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET for short). When the stimulation current exceeds the preset threshold, by reducing the conduction voltage of the first controllable switch 30, the first controllable switch 30 is driven to turn off. The preset threshold can be within plus or minus 10% of the stimulation current. When the stimulation current exceeds this range, the first controllable switch 30 is turned off.

[0041] In the protection circuit in the embodiment of the present application, when the stimulation current flowing through the electrostimulation component exceeds the preset threshold, the first controllable switch 30 is driven to turn off, that is, the current in the electrostimulation component connected to the output end of the first controllable switch 30 is turned off, avoiding the harm to the human body when the electrostimulation current exceeds the preset threshold and improving safety.

[0042] In one embodiment, the protection trigger circuit 10 includes a current sampling circuit and a first triode Q1. As Figure 2 shown, the input end of the first triode Q1 is connected to a high voltage, and the output end of the first triode Q1 is connected to the first controllable switch 30 through a fifth resistor R5; the current sampling circuit includes a sixth resistor R6. The input end of the sixth resistor R6 is connected to a high voltage, and the output end of the sixth resistor R6 is connected to the first controllable switch 30; the current sampling circuit is used to detect the stimulation current flowing through the sixth resistor R6 and drive the first triode Q1 to conduct when the stimulation current is greater than the preset value; when the first triode Q1 conducts, the first controllable switch 30 turns off.

[0043] In practical applications, the first triode Q1 can be a PNP triode. The emitter of the first triode Q1 is connected to a high voltage. It should be noted that the high voltage in this embodiment can be the supply voltage of the first triode Q1. The sixth resistor R6 serves as a current sampling resistor, one end of which is connected to the high voltage and the other end is connected to the first controllable switch 30. When the voltage drop caused by the stimulation current flowing through the sixth resistor R6 is sufficient to turn on the first triode Q1, the first triode Q1 conducts. At the same time, since the first triode Q1 conducts, it will force the conduction voltage of the first controllable switch 30 to drop below the turn-on voltage of the first controllable switch 30, and the first controllable switch 30 turns off.

[0044] In this embodiment, the first controllable switch 30 is an NMOS.

[0045] In one embodiment, the stimulation current output circuit 20 includes a second amplifier circuit and a constant current circuit. Among them, the input end of the second amplifier circuit is connected to the host computer, the output end of the second amplifier circuit is connected to the constant current circuit, and the second amplifier circuit is used to receive the preset stimulation current sent by the host computer and amplify the stimulation current and then output it to the constant current circuit; the input end of the constant current circuit is connected to the second amplifier circuit, and the output end of the constant current circuit is connected to the electrostimulation component; the constant current circuit is used to stabilize the stimulation current.

[0046] The second amplifier circuit amplifies the stimulation current set by the host computer and then outputs it to the constant current circuit. As Figure 3 shown, the second amplifier circuit may include a second amplifier U2, a thirteenth resistor R13, a second capacitor C2, and an eleventh resistor R11; among them, the non-inverting input terminal of the second amplifier U2 is connected to the eleventh resistor R11 and the thirteenth resistor R13, the inverting input terminal of the second amplifier U2 is connected to the constant current circuit, and the output terminal of the second amplifier U2 is connected to the constant current circuit; one end of the thirteenth resistor R13 is connected to the host computer, and the other end of the thirteenth resistor R13 is connected to the non-inverting input terminal of the second amplifier U2; one end of the second capacitor C2 is connected to the non-inverting input terminal of the second amplifier U2, and the other end of the second capacitor C2 is grounded; the eleventh resistor R11 is connected in parallel with the second capacitor C2.

[0047] As Figure 3 shown, the constant current circuit includes a second triode Q4, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10. Among them, the base of the second triode Q4 is connected to the ninth resistor R9, the collector of the second triode Q4 is connected to the electrostimulation component through the seventh resistor R7, and the emitter of the second triode Q4 is grounded through the eighth resistor R8; one end of the ninth resistor R9 is connected to the base of the second triode Q4, and the other end of the ninth resistor R9 is connected to the second amplifier circuit; one end of the tenth resistor R10 is connected to the emitter of the second triode Q4, and the other end of the tenth resistor R10 is connected to the second amplifier circuit.

[0048] In this embodiment, the second triode Q4 can be an NPN triode.

[0049] Since the voltages at the non-inverting input terminal and the inverting input terminal of the second amplifier U2 are equal, when a voltage is input to the thirteenth resistor R13, the voltage across the eighth resistor R8 is also the same input voltage. Therefore, regardless of how the outside changes, the current flowing through the eighth resistor R8 remains unchanged. When the second triode Q4 is turned on, the current flowing through the seventh resistor R7 is the same as the current flowing through the eighth resistor R8, achieving a constant current effect.

[0050] In one embodiment, the protection circuit may further include: a controllable switch control circuit. The input terminal of the controllable switch control circuit is connected to the host computer, and the output terminal of the controllable switch control circuit is connected to the first controllable switch 30. The controllable switch control circuit is configured to receive a pulse voltage to control the first controllable switch 30 to turn on or off.

[0051] The controllable switch control circuit controls the turning on and off of the first controllable switch 30 by receiving a pulse voltage. In practical applications, the first controllable switch 30 can be turned on after the stimulation current does not exceed the preset threshold, further improving the safety.

[0052] In one embodiment, as Figure 2 shown, the controllable switch control circuit includes: a voltage dividing circuit and a second controllable switch Q3. The input terminal of the voltage dividing circuit is connected to the pulse voltage, and the output terminal of the voltage dividing circuit is connected to the first controllable switch 30 through a fourth resistor. The voltage dividing circuit provides a turn-on voltage for the second controllable switch Q3 through voltage division of the voltage dividing resistor, so that the second controllable switch Q3 is turned on when receiving a low level, or turned off when the second controllable switch Q3 receives a high level.

[0053] In this embodiment, the first controllable switch 30 can be a P-type MOSFET.

[0054] In one embodiment, the protection circuit further includes: a current monitoring circuit. The input terminal of the current monitoring circuit is connected to the electrostimulation component, and the output terminal of the current monitoring circuit is connected to the host computer. The electrostimulation component is used to directly contact the skin to stimulate the part to be physiotherapied through a stimulation current.

[0055] The current monitoring circuit is configured to monitor the stimulation current of the electrostimulation component and output the stimulation current to the host computer, so that the host computer determines whether the stimulation current is within a preset range.

[0056] The current monitoring circuit in this embodiment is used to monitor the stimulation current in the electrical stimulation component, output it to the host computer, compare it with the threshold value set in the host computer, ensure that the electrical stimulation current is within the expected range, and the host computer can adjust the electrical stimulation current through monitoring feedback.

[0057] In one embodiment, the current monitoring circuit includes a current sensing circuit and a first amplifying circuit. The input end of the current sensing circuit is connected to the electrical stimulation component, and the output end of the current sensing circuit is connected to the first amplifying circuit. The current sensing circuit is used to monitor the stimulation current in the electrical stimulation component and output the amplified stimulation current to the host computer through the first amplifying circuit.

[0058] In one embodiment, the current sensing circuit includes a sensing resistor. One end of the sensing resistor is connected to the electrical stimulation component, and the other end of the sensing resistor is connected to the first amplifying circuit.

[0059] As Figure 3 shown, the first amplifying circuit may include: a first amplifier U1, a twelfth resistor R12, a first capacitor C1, and a first diode D1; one end of the first capacitor C1 is connected to the positive electrode of the first diode D1, and the other end of the first capacitor C1 is grounded; the positive electrode of the first diode D1 is connected to the host computer, and the negative electrode of the first diode D1 is connected to the first voltage; one end of the twelfth resistor R12 is connected to the output end of the first amplifier U1, and the other end of the twelfth resistor R12 is connected to the positive electrode of the first diode D1; the non-inverting input end of the first amplifier U1 is connected to one end of the sensing resistor, the inverting input end of the first amplifier U1 is connected to the other end of the sensing resistor, and the output end of the first amplifier U1 is connected to the twelfth resistor R12.

[0060] In this embodiment, the sensing resistor may be the seventh resistor R7. Since the seventh resistor R7 is connected to the electrical stimulation component, it can sense the stimulation current and output it to the host computer through the first amplifying circuit, so that the host computer can judge whether the stimulation current is within the preset stimulation current range, realizing double overcurrent protection and further ensuring the safety and reliability of the electrical stimulation.

[0061] The embodiment of the present application also provides a physiotherapy apparatus, which includes the above protection circuit. For the beneficial effects brought by the above protection circuit to the physiotherapy apparatus, please refer to the above description of the protection circuit and will not be repeated here.

[0062] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and facilitating understanding, rather than limitations. The above details do not limit the present application to necessarily adopt the above specific details for implementation.

[0063] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open-ended words, meaning "including but not limited to", and can be used interchangeably with each other. The word "or" and "and" used herein refer to the word "and / or", and can be used interchangeably with each other, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to", and can be used interchangeably with each other.

[0064] It should also be noted that in the devices, equipment, and methods of the present application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present application.

[0065] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects are very obvious to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

[0066] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth", and "sixth" used in the description of the embodiments of the present application are only for more clearly elaborating the technical solutions and cannot be used to limit the protection scope of the present application.

[0067] The above description has been given for purposes of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions, and sub-combinations thereof.

Claims

1. A protection circuit, characterized in that, Comprising: A protection trigger circuit (10), a stimulation current output circuit (20), and a first controllable switch (30), wherein The input end of the stimulation current output circuit (20) is connected to the host computer, the output end of the stimulation current output circuit (20) is connected to the electrostimulation component, and the stimulation current output circuit (20) is used to output according to the preset stimulation current of the host computer, so that the electrostimulation component outputs according to the preset stimulation current; The input end of the protection trigger circuit (10) is connected to a high voltage, and the output end of the protection trigger circuit (10) is connected to the first controllable switch (30); The input end of the first controllable switch (30) is connected to the protection trigger circuit (10), and the output end of the first controllable switch (30) is connected to the electrostimulation component; the protection trigger circuit (10) is used to drive the first controllable switch (30) to turn off when the stimulation current exceeds a preset threshold, so that the electrostimulation component no longer outputs the stimulation current.

2. The protection circuit according to claim 1, characterized in that The protection trigger circuit (10) includes a current sampling circuit and a first triode, The input end of the first triode is connected to a high voltage, and the output end of the first triode is connected to the first controllable switch (30) through a fifth resistor; The current sampling circuit includes a sixth resistor, the input end of the sixth resistor is connected to a high voltage, and the output end of the sixth resistor is connected to the first controllable switch (30); the current sampling circuit is used to detect the stimulation current flowing through the sixth resistor and drive the first triode to conduct when the stimulation current is greater than a preset value; when the first triode conducts, the first controllable switch (30) turns off.

3. The protection circuit according to claim 1, wherein The stimulation current output circuit (20) includes a second amplification circuit and a constant current circuit, wherein The input end of the second amplification circuit is connected to the host computer, the output end of the second amplification circuit is connected to the constant current circuit, and the second amplification circuit is used to receive the preset stimulation current sent by the host computer and amplify the stimulation current and then output it to the constant current circuit; The input end of the constant current circuit is connected to the second amplification circuit, and the output end of the constant current circuit is connected to the electrostimulation component; the constant current circuit is used to stabilize the stimulation current.

4. The protection circuit according to claim 3, characterized in that The constant current circuit includes a second triode, an eighth resistor, a ninth resistor, and a tenth resistor, wherein The base of the second triode is connected to the ninth resistor, the collector of the second triode is connected to the electrostimulation component through a seventh resistor, and the emitter of the second triode is grounded through the eighth resistor; One end of the ninth resistor is connected to the base of the second triode, and the other end of the ninth resistor is connected to the second amplification circuit; One end of the tenth resistor is connected to the emitter of the second triode, and the other end of the tenth resistor is connected to the second amplification circuit.

5. The protection circuit according to claim 1, wherein The protection circuit further includes: a controllable switch control circuit, the input end of the controllable switch control circuit is connected to the host computer, and the output end of the controllable switch control circuit is connected to the first controllable switch (30); The controllable switch control circuit is configured to receive a pulsed voltage to control the turning on or off of the first controllable switch (30).

6. The protection circuit according to claim 5, wherein The controllable switch control circuit includes: a voltage dividing circuit and a second controllable switch, The input end of the voltage dividing circuit is connected to the pulsed voltage, and the output end of the voltage dividing circuit is connected to the first controllable switch (30) through a fourth resistor; The voltage dividing circuit provides a turn-on voltage for the second controllable switch through voltage division of a voltage dividing resistor, so that the second controllable switch conducts when receiving a low level, or turns off when the second controllable switch receives a high level.

7. The protection circuit according to claim 1, characterized in that, The protection circuit further includes: a current monitoring circuit, the input end of the current monitoring circuit is connected to the electrostimulation component, and the output end of the current monitoring circuit is connected to the host computer; the electrostimulation component is used for direct contact with the skin to stimulate a part to be physiotherapied through a stimulating current; The current monitoring circuit is configured to monitor the stimulating current of the electrostimulation component and output the stimulating current to the host computer, so that the host computer determines whether the stimulating current is within a preset range.

8. The protection circuit according to claim 7, characterized in that The current monitoring circuit includes a current sensing circuit and a first amplifying circuit, The input end of the current sensing circuit is connected to the electrostimulation component, the output end of the current sensing circuit is connected to the first amplifying circuit, the current sensing circuit is configured to monitor the stimulating current of the electrostimulation component, and amplify the stimulating current through the first amplifying circuit and then output it to the host computer.

9. The protection circuit according to claim 8, wherein The current sensing circuit includes a sensing resistor, one end of the sensing resistor is connected to the electrostimulation component, and the other end of the sensing resistor is connected to the first amplifying circuit.

10. A physiotherapy apparatus, characterized in that, Comprising the protection circuit according to any one of claims 1-9.

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