Electroencephalogram signal monitoring device

Abstract

The utility model discloses an electroencephalogram signal monitoring device, and relates to the technical field of medical equipment, the monitoring device comprises a signal acquisition circuit used for acquiring electroencephalogram signals; the input end of the signal isolation amplification circuit is connected with the output end of the signal acquisition circuit, and the output end of the signal isolation amplification circuit is connected with the signal receiving end of the control module; the output end of the control module is connected with the input end of the signal amplification circuit, the output end of the signal amplification circuit is connected with the input end of the display module, and the display module is used for displaying the electroencephalogram signals. According to the application, the signal isolation amplification circuit is adopted to isolate high voltage and low voltage so as to prevent an electric shock phenomenon caused by electric leakage.

Description

Technical Field

[0001] This utility model relates to the field of medical equipment technology, and in particular to an electroencephalogram (EEG) signal monitoring device. Background Technology

[0002] Electroencephalogram (EEG) signals are bioelectrical signals generated when neurons transmit information; they are electrical wave signals produced by ion exchange during synaptic activity of pyramidal cells in the cerebral cortex. EEG signal detection involves observing brain activity using electrodes placed on the scalp according to specific rules. EEG signals are very weak, only tens of microvolts, so amplification is necessary during acquisition. However, traditional EEG signal amplification circuits do not isolate high and low voltage levels, which can lead to serious consequences if the instrument malfunctions and leaks current. Utility Model Content

[0003] The purpose of this invention is to provide an electroencephalogram (EEG) signal monitoring device that uses a signal isolation amplification circuit to isolate high and low voltages to prevent electric shock caused by leakage.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] One aspect of this utility model provides an electroencephalogram (EEG) signal monitoring device, the monitoring device comprising: a signal acquisition circuit for acquiring EEG signals; a signal isolation amplification circuit and a control module, wherein the input terminal of the signal isolation amplification circuit is connected to the output terminal of the signal acquisition circuit, and the output terminal of the signal isolation amplification circuit is connected to the signal receiving terminal of the control module; a signal amplification circuit and a display module, wherein the output terminal of the control module is connected to the input terminal of the signal amplification circuit, and the output terminal of the signal amplification circuit is connected to the input terminal of the display module, the display module being used to display the EEG signals.

[0006] In some embodiments, the signal isolation amplification circuit includes a first-stage amplification circuit, a startup circuit, and a second-stage amplification circuit. The startup circuit is connected to both the first-stage and second-stage amplification circuits. The first-stage amplification circuit includes a first transistor, a first resistor, a second resistor, a third resistor, and a fourth resistor. The collector of the first transistor is connected to one end of the first resistor, and the other end of the first resistor is connected to a first power supply. The base of the first transistor is connected to one end of the second resistor and one end of the third resistor. The other end of the second resistor is connected to the output terminal of the signal acquisition circuit, and the other end of the third resistor is grounded. The emitter of the first transistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to the startup circuit.

[0007] In some embodiments, the first-stage amplifier circuit further includes a first optocoupler and a fifth resistor. The light-emitting ends of the first optocoupler are connected to the output end of the signal acquisition circuit. The input end of the light-receiving end of the first optocoupler is connected to the collector of the first transistor and one end of the first resistor through the fifth resistor. The output end of the light-receiving end of the first optocoupler is connected to the other end of the second resistor.

[0008] In some embodiments, the startup circuit includes a first operational amplifier and a sixth resistor. The non-inverting input of the first operational amplifier is connected to a startup signal, and the inverting input of the first operational amplifier is connected to one end of the sixth resistor and the other end of the fourth resistor. The other end of the sixth resistor is grounded, and the output of the first operational amplifier is connected to the second stage amplifier circuit.

[0009] In some embodiments, the startup circuit further includes a second optocoupler, a third optocoupler, a second transistor, a seventh resistor, an eighth resistor, a ninth resistor, and a tenth resistor. The base of the second transistor is used to receive a startup signal. The collector of the second transistor is connected to a first power supply through the eighth resistor. The emitter of the second transistor is connected to the input terminal of the light-emitting end of the second optocoupler. The input terminal of the light-receiving end of the second optocoupler is connected to one end of the seventh resistor and the non-inverting input terminal of the first operational amplifier through the ninth resistor. The other end of the seventh resistor is connected to the first power supply. The output terminal of the light-receiving end of the second optocoupler is grounded. The output terminal of the light-emitting end of the second optocoupler is connected to the input terminal of the light-emitting end of the third optocoupler. The output terminal of the light-emitting end of the third optocoupler is connected to the output terminal of the first operational amplifier. The input terminal of the light-receiving end of the third optocoupler is connected to a second power supply through the tenth resistor. The output terminal of the light-receiving end of the third optocoupler is connected to the second-stage amplifier circuit.

[0010] In some embodiments, the second-stage amplifier circuit includes a third transistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a fourteenth resistor. The collector of the third transistor is connected to a second power supply through the eleventh resistor, the base of the third transistor is connected to the output terminal of the light-receiving end of the third optocoupler through the twelfth resistor, the base of the third transistor is grounded through the thirteenth resistor, and the emitter of the third transistor is connected to the signal receiving end of the control module through the fourteenth resistor.

[0011] In some embodiments, the second-stage amplifier circuit further includes a second operational amplifier, a fifteenth resistor, and a sixteenth resistor. The non-inverting input of the second operational amplifier is connected to the emitter of the third transistor through the fourteenth resistor. The inverting input of the second operational amplifier is connected to one end of the fifteenth resistor and one end of the sixteenth resistor. The other end of the fifteenth resistor is grounded. The other end of the sixteenth resistor is connected to the output of the second operational amplifier. The output of the second operational amplifier is connected to the signal receiving end of the control module.

[0012] According to an embodiment of the present invention, an electroencephalogram (EEG) signal monitoring device has at least the following beneficial effects: In the first-stage amplification circuit, the present application uses a first optocoupler to isolate the weak current part of the signal acquisition circuit from the higher voltage first-stage amplification circuit. After the voltage is amplified for the first time in the first-stage amplification circuit, a second optocoupler and a third optocoupler are used to isolate the higher voltage first-stage amplification circuit and the start-up circuit from the even higher voltage second-stage amplification circuit to prevent electric shock caused by leakage. The present application sets two isolations to increase the safety of the monitoring device.

[0013] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this disclosure. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic block diagram of the electroencephalogram (EEG) signal monitoring device according to an embodiment;

[0016] Figure 2 This is a circuit diagram of an electroencephalogram (EEG) signal monitoring device according to an embodiment. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that the description of this disclosure will be more complete and fully convey the concept of the exemplary embodiments to those skilled in the art. The drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0021] The technical solutions of the embodiments of this application are briefly described below:

[0022] According to some embodiments, such as Figure 1 As shown, this application provides an electroencephalogram (EEG) signal monitoring device, the monitoring device comprising:

[0023] Signal acquisition circuit, used to acquire electroencephalogram (EEG) signals;

[0024] The signal isolation amplifier circuit and the control module are provided. The input terminal of the signal isolation amplifier circuit is connected to the output terminal of the signal acquisition circuit, and the output terminal of the signal isolation amplifier circuit is connected to the signal receiving terminal 200 of the control module.

[0025] The signal amplification circuit and display module are configured such that the output of the control module is connected to the input of the signal amplification circuit, and the output of the signal amplification circuit is connected to the input of the display module, which is used to display EEG signals.

[0026] The working principle is as follows: after the signal acquisition circuit acquires and filters the EEG signal, it is isolated and amplified by the signal isolation and amplification circuit. After the signal is amplified, it is input to the signal receiving end 200 of the control module. The output end of the control module outputs a control signal according to the amplified EEG signal. The control signal is output to the signal amplification circuit for amplification. The signal amplification circuit outputs the amplified control signal to the display module, and the display module displays the EEG waveform.

[0027] Electroencephalogram (EEG) signals are very weak, only tens of microvolts, so they need to be amplified during EEG signal acquisition. However, traditional EEG signal amplification circuits do not isolate high and low voltages, which can lead to serious consequences if the instrument malfunctions and leaks current. This application employs a signal isolation amplification circuit to isolate high and low voltages, preventing electric shock caused by leakage.

[0028] The following is in conjunction with the appendix to this instruction manual. Figures 1 to 2 The preferred embodiments of this disclosure will be further described in detail below.

[0029] According to some embodiments, the signal isolation amplifier circuit includes a first-stage amplifier circuit, a startup circuit, and a second-stage amplifier circuit, wherein the startup circuit is connected to the first-stage amplifier circuit and the second-stage amplifier circuit respectively.

[0030] like Figure 2 As shown, the first-stage amplifier circuit includes a first transistor Q1, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The collector of the first transistor Q1 is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to the first power supply V1. The base of the first transistor Q1 is connected to one end of the second resistor R2 and one end of the third resistor R3. The other end of the second resistor R2 is connected to the output terminal of the signal acquisition circuit, and the other end of the third resistor R3 is grounded. The emitter of the first transistor Q1 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the startup circuit.

[0031] Furthermore, such as Figure 2 As shown, the first-stage amplifier circuit also includes a first optocoupler U1 and a fifth resistor R5. The two ends of the light-emitting end of the first optocoupler U1 are used to connect to the output end of the signal acquisition circuit. The input end of the light-receiving end of the first optocoupler U1 is connected to the collector of the first transistor Q1 and one end of the first resistor R1 through the fifth resistor R5. The output end of the light-receiving end of the first optocoupler U1 is connected to the other end of the second resistor R2.

[0032] The first optocoupler U1 has two light-emitting ends for receiving the output of the signal acquisition circuit. After the signal acquisition circuit acquires and filters the EEG signal, it outputs it to the light-emitting end of the first optocoupler U1. The first optocoupler U1 amplifies the EEG signal for the first time through the first transistor Q1, and then outputs it to the start-up circuit and the second-stage amplification circuit. Finally, the second-stage amplification circuit outputs it to the signal receiving end 200 of the control module.

[0033] In the first-stage amplifier circuit, this application uses a first optocoupler U1 to isolate the low-voltage part of the signal acquisition circuit from the higher-voltage first-stage amplifier circuit, so as to prevent leakage caused by faults in the higher-voltage first-stage amplifier circuit and the start-up circuit.

[0034] According to some embodiments, such as Figure 2 As shown, the startup circuit includes a first operational amplifier U11 and a sixth resistor R6. The non-inverting input of the first operational amplifier U11 is connected to the startup signal 100. The inverting input of the first operational amplifier U11 is connected to one end of the sixth resistor R6 and the other end of the fourth resistor R4. The other end of the sixth resistor R6 is grounded. The output of the first operational amplifier U11 is connected to the second-stage amplifier circuit.

[0035] Furthermore, such as Figure 2 As shown, the startup circuit also includes a second optocoupler U2, a third optocoupler U3, a second transistor Q2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10. The base of the second transistor Q2 is used to receive the startup signal 100. The collector of the second transistor Q2 is connected to the first power supply V1 through the eighth resistor R8. The emitter of the second transistor Q2 is connected to the input terminal of the light-emitting end of the second optocoupler U2. The input terminal of the light-receiving end of the second optocoupler U2 is connected to one end of the seventh resistor R7 through the ninth resistor R9. The non-inverting input terminal of the first operational amplifier U11 and the other end of the seventh resistor R7 are connected to the first power supply V1. The output terminal of the light-receiving terminal of the second optocoupler U2 is grounded. The output terminal of the light-emitting terminal of the second optocoupler U2 is connected to the input terminal of the light-emitting terminal of the third optocoupler U3. The output terminal of the light-emitting terminal of the third optocoupler U3 is connected to the output terminal of the first operational amplifier U11. The input terminal of the light-receiving terminal of the third optocoupler U3 is connected to the second power supply V2 through the tenth resistor R10. The output terminal of the light-receiving terminal of the third optocoupler U3 is connected to the second stage amplifier circuit.

[0036] The working principle of the above embodiment is as follows: When no EEG test is performed, the start signal 100 is a low-level signal, the light-emitting end of the first optocoupler U1 does not receive the output of the signal acquisition circuit, the second transistor Q2 is cut off, and the second optocoupler U2 and the third optocoupler U3 do not work. When an EEG test is performed, the start signal 100 is a high-level signal, the light-emitting end of the first optocoupler U1 receives the output signal of the signal acquisition circuit, the first-stage amplifier circuit amplifies it and outputs it to the first operational amplifier U11, the first operational amplifier U11 outputs a low-level signal, the second transistor Q2 is turned on, the second optocoupler U2 and the third optocoupler U3 are turned on, the non-inverting input of the first operational amplifier U11 is pulled low, the first operational amplifier U11 amplifies and outputs the EEG signal, the amplified EEG signal is output to the second-stage amplifier circuit, the second-stage amplifier circuit amplifies it again and outputs it to the signal receiving end 200 of the control module.

[0037] The startup circuit also has signal amplification capabilities, but its primary function is signal isolation. The second optocoupler U2 and the third optocoupler U3 isolate the higher-voltage first-stage amplifier circuit and startup circuit from the higher-voltage second-stage amplifier circuit to prevent electric shock caused by leakage.

[0038] According to some embodiments, such as Figure 2 As shown, the second-stage amplifier circuit includes a third transistor Q3, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, and a fourteenth resistor R14. The collector of the third transistor Q3 is connected to the second power supply V2 through the eleventh resistor R11, the base of the third transistor Q3 is connected to the output terminal of the light-receiving end of the third optocoupler U3 through the twelfth resistor R12, the base of the third transistor Q3 is grounded through the thirteenth resistor R13, and the emitter of the third transistor Q3 is connected to the signal receiving terminal 200 of the control module through the fourteenth resistor R14.

[0039] Furthermore, such as Figure 2 As shown, the second-stage amplifier circuit also includes a second operational amplifier U12, a fifteenth resistor R15, and a sixteenth resistor R16. The non-inverting input of the second operational amplifier U12 is connected to the emitter of the third transistor Q3 through the fourteenth resistor R14. The inverting input of the second operational amplifier U12 is connected to one end of the fifteenth resistor R15 and one end of the sixteenth resistor R16. The other end of the fifteenth resistor R15 is grounded, and the other end of the sixteenth resistor R16 is connected to the output of the second operational amplifier U12. The output of the second operational amplifier U12 is connected to the signal receiving terminal 200 of the control module.

[0040] EEG signals are very weak, only tens of microvolts, so they need to be amplified during acquisition. However, traditional EEG signal amplification circuits do not isolate high and low voltages, which can lead to serious consequences if the instrument malfunctions and leaks current. In this application, a first optocoupler isolates the weak current portion of the signal acquisition circuit from the higher voltage first-stage amplification circuit in the first-stage amplification circuit. After the voltage is amplified for the first time in the first-stage amplification circuit, second and third optocouplers isolate the higher voltage first-stage amplification circuit and the startup circuit from the even higher voltage second-stage amplification circuit to prevent electric shock caused by leakage current. This double isolation system significantly increases the safety of the monitoring device.

[0041] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0042] Although this disclosure has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Because this disclosure can be embodied in many forms without departing from the spirit or substance of this application, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A brainwave signal monitoring device, characterized in that, The monitoring device includes: A signal acquisition circuit, wherein the signal acquisition circuit is used to acquire electroencephalogram (EEG) signals; A signal isolation amplifier circuit and a control module are provided, wherein the input terminal of the signal isolation amplifier circuit is connected to the output terminal of the signal acquisition circuit, and the output terminal of the signal isolation amplifier circuit is connected to the signal receiving terminal of the control module. The system includes a signal amplification circuit and a display module. The output terminal of the control module is connected to the input terminal of the signal amplification circuit, and the output terminal of the signal amplification circuit is connected to the input terminal of the display module. The display module is used to display electroencephalogram (EEG) signals.

2. The monitoring device according to claim 1, characterized in that, The signal isolation amplifier circuit includes a first-stage amplifier circuit, a startup circuit, and a second-stage amplifier circuit, wherein the startup circuit is connected to the first-stage amplifier circuit and the second-stage amplifier circuit respectively. The first-stage amplifier circuit includes a first transistor, a first resistor, a second resistor, a third resistor, and a fourth resistor. The collector of the first transistor is connected to one end of the first resistor, and the other end of the first resistor is connected to a first power supply. The base of the first transistor is connected to one end of the second resistor and one end of the third resistor. The other end of the second resistor is connected to the output terminal of the signal acquisition circuit, and the other end of the third resistor is grounded. The emitter of the first transistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to the startup circuit.

3. The monitoring device according to claim 2, characterized in that, The first-stage amplifier circuit further includes a first optocoupler and a fifth resistor. The two ends of the light-emitting end of the first optocoupler are used to connect to the output end of the signal acquisition circuit. The input end of the light-receiving end of the first optocoupler is connected to the collector of the first transistor and one end of the first resistor through the fifth resistor. The output end of the light-receiving end of the first optocoupler is connected to the other end of the second resistor.

4. The monitoring device according to claim 2, characterized in that, The startup circuit includes a first operational amplifier and a sixth resistor. The non-inverting input of the first operational amplifier is connected to a startup signal, and the inverting input of the first operational amplifier is connected to one end of the sixth resistor and the other end of the fourth resistor. The other end of the sixth resistor is grounded, and the output of the first operational amplifier is connected to the second stage amplifier circuit.

5. The monitoring device according to claim 4, characterized in that, The startup circuit further includes a second optocoupler, a third optocoupler, a second transistor, a seventh resistor, an eighth resistor, a ninth resistor, and a tenth resistor. The base of the second transistor is used to receive a startup signal. The collector of the second transistor is connected to a first power supply through the eighth resistor. The emitter of the second transistor is connected to the input terminal of the light-emitting end of the second optocoupler. The input terminal of the light-receiving end of the second optocoupler is connected to one end of the seventh resistor and the non-inverting input terminal of the first operational amplifier through the ninth resistor. The other end of the seventh resistor is connected to the first power supply. The output terminal of the light-receiving end of the second optocoupler is grounded. The output terminal of the light-emitting end of the second optocoupler is connected to the input terminal of the light-emitting end of the third optocoupler. The output terminal of the light-emitting end of the third optocoupler is connected to the output terminal of the first operational amplifier. The input terminal of the light-receiving end of the third optocoupler is connected to a second power supply through the tenth resistor. The output terminal of the light-receiving end of the third optocoupler is connected to the second-stage amplifier circuit.

6. The monitoring device according to claim 5, characterized in that, The second-stage amplifier circuit includes a third transistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a fourteenth resistor. The collector of the third transistor is connected to a second power supply through the eleventh resistor. The base of the third transistor is connected to the output terminal of the light-receiving end of the third optocoupler through the twelfth resistor. The base of the third transistor is grounded through the thirteenth resistor. The emitter of the third transistor is connected to the signal receiving end of the control module through the fourteenth resistor.

7. The monitoring device according to claim 6, characterized in that, The second-stage amplifier circuit also includes a second operational amplifier, a fifteenth resistor, and a sixteenth resistor. The non-inverting input of the second operational amplifier is connected to the emitter of the third transistor through the fourteenth resistor. The inverting input of the second operational amplifier is connected to one end of the fifteenth resistor and one end of the sixteenth resistor. The other end of the fifteenth resistor is grounded. The other end of the sixteenth resistor is connected to the output of the second operational amplifier. The output of the second operational amplifier is connected to the signal receiving end of the control module.

Images