Multifunctional digital electroencephalograph

Abstract

The utility model discloses a multifunctional digital electroencephalograph, which comprises a casing, a processor, a display screen, keys, a biological amplifier U5, a sensor U4, a memory, a USB (universal serial bus) isolator and a Bluetooth module, the display screen and the keys are arranged on the casing, and the display screen, the keys, the biological amplifier U5, the sensor U4, the memory, the USB isolator and the Bluetooth module are all connected with the processor. The biological amplifier U5 is provided with an amplifying circuit and a common-mode suppression circuit, and the sensor U4 is provided with an induction circuit; the amplifier U5 has 20 channels and a common-mode rejection ratio gt; the 110dB is used for collecting a bio-electricity signal of a subject and amplifying the amplitude of the bio-electricity signal; the sensor U4 is a 3D acceleration sensor and is used for collecting motion information of a subject. The utility model has the beneficial effects of multiple functions, low energy consumption, simplicity in operation, and production and maintenance cost saving.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a multifunctional digital electroencephalograph. Background Technique

[0002] An electroencephalograph collects the weak electrical signals of the brain activities of the examinee through the electrodes placed on the head of the examinee. After being amplified and filtered by a high-performance electrical amplifier, it is then subjected to analog-to-digital conversion, baseline processing, quantization, etc. by a processor. On the computer, it is subjected to comprehensive processing such as storage, display, playback, and printing by a dedicated electroencephalogram processing software, providing a diagnostic basis for medical staff.

[0003] According to different application scopes, electroencephalographs can be divided into conventional electroencephalographs, ambulatory electroencephalographs, video electroencephalographs, etc. For this reason, hospitals need to configure 3 types of electroencephalographs, increasing the investment and maintenance costs of the equipment. Conventional electroencephalographs generally use external power supply, do not support the recording function, and do not support ambulatory electroencephalograms. And general ambulatory electroencephalographs do not support real-time acquisition and real-time transmission functions, and the maximum number of acquisition channels is 16 channels, and they cannot acquire electrocardiograms and electromyograms. Content of the Utility Model

[0004] The purpose of the utility model is to provide a multifunctional digital electroencephalograph to solve the problems put forward in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A multifunctional digital electroencephalograph, including a machine shell, further including a processor, a display screen, buttons, a bioelectric amplifier U5, a sensor U4, a memory, a USB isolator, and a Bluetooth module. The display screen and buttons are arranged on the machine shell. The display screen, buttons, bioelectric amplifier U5, sensor U4, memory, USB isolator, and Bluetooth module are all connected to the processor. The bioelectric amplifier U5 has an amplification circuit and a common-mode drive circuit, and the sensor U4 has an induction circuit;

[0006] The bioamplifier U5 has 20 channels and a common-mode rejection ratio > 110 dB, and is used to collect the bioelectric signals of the examinee and amplify their amplitudes;

[0007] The sensor U4 is a 3D acceleration sensor and is used to collect the motion information of the examinee.

[0008] Preferably, the amplifier circuit includes resistor R1, resistor R2, resistor R3, resistor R4, resistor R6, resistor R7, resistor R8, capacitor C9, capacitor C10, capacitor C11, capacitor C12, capacitor C13, and capacitor C14. Resistor R6 is connected to the first and eighth pins of the amplifier U5. Resistor R7 is connected to the second pin of the amplifier U5 through capacitor C13. Resistor R8 is connected to the third pin of the amplifier U5 through capacitor C14. The sixth pin of the amplifier U5 is connected to the processor respectively, and the fourth pin of the amplifier U5 is grounded;

[0009] Wherein, both ends of capacitor C11 are respectively connected to resistor R7 and resistor R8;

[0010] One end of capacitor C9 and capacitor C10 are connected to ground together, and the other ends are respectively connected to resistor R7 and resistor R8;

[0011] After resistor R3 and resistor R4 are connected in series, both ends are respectively connected to one end of capacitor C13 and capacitor C14. After resistor R1 and resistor R2 are connected in series, both ends are respectively connected to the other end of capacitor C13 and capacitor C14. And the center point of resistor R3 and R4 is connected to the center point of resistor R1 and R2 to provide a bias voltage for the amplifier U5.

[0012] Preferably, the common-mode driving circuit includes amplifier U4-A and amplifier U4-B. The output end of amplifier U4-A is connected to the inverting input end of amplifier U4-B. The non-inverting input end of amplifier U4-A is connected to the common-mode signal of the bioelectric amplifier. The output end of amplifier U4-B is connected to the common-mode driving electrode, where:

[0013] The non-inverting input end of amplifier U4-A is connected to the common-mode signal;

[0014] The inverting input end of amplifier U4-A is connected to the output pin, forming a follower circuit;

[0015] The non-inverting input end of amplifier U4-B is grounded. A resistor R31 and a capacitor C23 are connected in series between the inverting input end and the output end, and resistor R31 and capacitor C23 are also connected to resistor R30.

[0016] Preferably, the induction circuit includes capacitor C8. The ninth and tenth pins of the inductor U4 are connected to the power supply and connected to a filter capacitor.

[0017] Preferably, the processor is a single-chip microcomputer of Cortex-M4 model.

[0018] Preferably, the memory uses a non-volatile memory with a capacity of 8GB.

[0019] Preferably, the Bluetooth module is Bluetooth 5.3.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] 1. The present utility model is provided with a USB isolator to isolate the power supply and USB communication, improving safety. Compared with the traditional safety protection technology of unplugging the lead wire and then replacing it with a communication wire, the operation is more simplified.

[0022] 2. The present utility model is provided with a bioelectric amplifier U5, a matching amplifier circuit and a common-mode drive circuit, so as to achieve a high-performance analog front end with up to 20 channels at most. It has the characteristics of low noise, high common-mode rejection ratio and large dynamic input range, and can collect 17-channel electroencephalogram, 1-channel electrocardiogram and 2-channel electromyogram. It has multiple functions, higher information collection efficiency and more comprehensive collected data.

[0023] 3. The present utility model is provided with a sensor with 3D acceleration performance to record the movement information of the subject. In this way, it can not only provide the movement information of the subject for medical staff as a reference, but also filter out the baseline drift caused by movement when playing back the electroencephalogram to achieve the purpose of reducing movement interference. Compared with the prior art through the structural setting of the present utility model, it is more concise, has a higher integration degree, and

[0024] The processor uses a low-power chip, combined with an innovative circuit design. Compared with the prior art that requires an external power supply, the present utility model only needs two No. 5 alkaline batteries for power supply, with lower energy consumption; a display screen is provided on the casing, which can display dynamic images in real time, and is equipped with a large-capacity memory that can record and store inspection data. When used in cooperation with a host computer (such as a computer), it can also collect video electroencephalogram. It has multiple functions, and greatly reduces the manufacturing cost and maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the present utility model;

[0026] Figure 2 is a schematic diagram of module connection of the present utility model;

[0027] Figure 3 is a schematic diagram of the bioelectric amplification circuit principle of the present utility model;

[0028] Figure 4 is a schematic diagram of the common-mode drive circuit principle of the present utility model;

[0029] Figure 5 is a schematic diagram of the induction circuit principle of the present utility model.

[0030] In the figure: 1. Processor; 2. Display screen; 3. Button; 4. Memory; 5. USB isolator; 6. Bluetooth module; 7. Casing; 100. Amplifier circuit; 200. Common-mode drive circuit; 300. Induction circuit. Detailed implementation manners

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0032] Please refer to Figures 1 to 5 , the present utility model provides a technical solution: Please refer to Figures 1 to 5 , the present utility model provides a technical solution: A multifunctional digital electroencephalograph, including a machine case 7, further including a processor 1, a display screen 2, a key 3, a bioelectricity amplifier U5, a sensor U4, a memory 4, a USB isolator 5, and a Bluetooth module 6. The display screen 2 and the key 3 are arranged on the machine case 7. Among them, the display screen 2, the key 3, the bioelectricity amplifier U5, the sensor U4, the memory 4, the USB isolator 5, and the Bluetooth module 6 are all connected to the processor 1. The bioelectricity amplifier U5 has an amplification circuit 100 and a common-mode drive circuit 200, and the sensor U4 has an induction circuit 300.

[0033] In the embodiment of the present utility model, the bioelectricity amplifier U5 has 20 channels, and the common-mode rejection ratio > 110 dB, which is used to collect the bioelectricity signals of the examinee, and can simultaneously collect 17-channel electroencephalogram, 1-channel electrocardiogram, and 2-channel electromyogram. The bioelectricity amplifier U5 has the characteristics of low noise, high common-mode rejection ratio, and large dynamic input range, and the bioelectricity amplifier U5 can amplify the amplitude of the bioelectricity signals of the examinee.

[0034] In an embodiment of the present utility model, the sensor U4 is a 3D acceleration sensor, which is used to collect the motion information of the examinee.

[0035] It should be noted that the machine case 7 is also provided with an external high-speed USB communication interface and an independent power interface. The circuit in the USB interface is isolated by the USB isolator 5 (the USB isolator can use commercially available products). In this way, it not only improves the data reading speed of the present utility model, effectively reduces the data reading time, and the USB communication adopts communication isolation and power isolation, and uses an independent USB communication port, which not only ensures safety but also avoids the operation of plugging and unplugging the electroencephalogram lead wire. Compared with the traditional dynamic electroencephalogram recorder using a non-isolated scheme, in order to ensure the safety of patients, the USB port is generally covered with a lead wire, and when reading the record, it is necessary to unplug the electroencephalogram lead wire first and then insert the USB cable, and the operation is simpler.

[0036] It should also be noted that in actual use, the bioelectricity amplifier U5 of the present utility model is configured to be connected to the front end of an electroencephalograph.

[0037] In one embodiment of the present utility model, the operating voltage of the present utility model is 2.5V and is powered by two No. 5 alkaline batteries.

[0038] In one embodiment of the present utility model, the amplifier circuit 100 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R6, a resistor R7, a resistor R8, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, and a capacitor C14. The resistor R6 is connected to the 1st and 8th pins of the bioelectricity amplifier U5. The resistor R7 is connected to the 2nd pin of the bioelectricity amplifier U5 through the capacitor C13. The resistor R8 is connected to the 3rd pin of the bioelectricity amplifier U5 through the capacitor C14. The 6th pin of the bioelectricity amplifier U5 is connected to the processor, and the 4th pin of the bioelectricity amplifier U5 is grounded;

[0039] Wherein, both ends of the capacitor C11 are respectively connected to the resistor R7 and the resistor R8;

[0040] One end of the capacitor C9 and the capacitor C10 are commonly grounded, and the other ends are respectively connected to the resistor R7 and the resistor R8;

[0041] After the resistors R3 and R4 are connected in series, both ends are respectively connected to one end of the capacitor C13 and the capacitor C14. After the resistors R1 and R2 are connected in series, both ends are respectively connected to the other end of the capacitor C13 and the capacitor C14. And the midpoint of R3 and R4 is connected to the midpoint of the resistors R1 and R2 to provide a bias voltage for the instrumentation amplifier.

[0042] In one embodiment of the present utility model, the common-mode drive circuit 200 includes an amplifier U4-A and an amplifier U4-B. The output end of the amplifier U4-A is connected to the inverting input end of the amplifier U4-B. The non-inverting input end of the amplifier U4-A is connected to the processor, and the output end of the amplifier U4-B is connected to the processor; wherein:

[0043] The positive power supply pin of the amplifier U4-A is connected to the analog power supply and is also connected to the filter capacitor C24;

[0044] The negative power supply pin of the amplifier U4-A is connected to the negative power supply and is also connected to the filter capacitor;

[0045] The non-inverting input end of the amplifier U4-B is grounded. A resistor R31 and a capacitor C23 are connected in series between the inverting input end and the output end, and the resistor R31 and the capacitor C23 are also connected to the resistor R30.

[0046] In an embodiment of the present utility model, the induction circuit 300 includes a capacitor C8. The 9th and 10th pins of the inductor U4 are connected to the power supply and are also connected to a filter capacitor. The inductor U4 can not only collect the movement information of the subject but also provide the movement information of the subject for the doctor as a reference.

[0047] In a specific embodiment of the present utility model, the processor 1 is a single-chip microcomputer of the Cortex-M4 model.

[0048] In a specific embodiment of the present utility model, the memory 4 uses a non-volatile memory with a capacity of 8GB. The memory 4 can store electroencephalograms, electrocardiograms, electromyograms, and the synchronous movement information of the subject for 48 hours.

[0049] In a specific embodiment of the present utility model, the Bluetooth module 6 is Bluetooth 5.3. The electroencephalograms, electrocardiograms, and electromyograms collected in real time are uploaded to the host computer through the Bluetooth module 6 to implement the functions of conventional electroencephalogram or video electroencephalogram.

[0050] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A multifunctional digital electroencephalograph, comprising a housing, characterized in that: It also includes a processor, a display screen, a button, a bio-electric amplifier U5, a sensor U4, a memory, a USB isolator and a Bluetooth module, wherein the display screen and the button are arranged on the housing, and the display screen, the button, the bio-electric amplifier U5, the sensor U4, the memory, the USB isolator and the Bluetooth module are all connected to the processor, the bio-electric amplifier U5 has an amplification circuit and a common-mode drive circuit, and the sensor U4 has a sensing circuit; The bioelectric amplifier U5 has 20 channels and a common mode rejection ratio of >110dB, and is used to collect the bioelectric signals of the subject and amplify their amplitude; The sensor U4 is a 3D acceleration sensor, which is used to collect the motion information of the subject; The amplifying circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R6, a resistor R7, a resistor R8, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13 and a capacitor C14, the resistor R6 is connected to the 1st and 8th pins of the bio-amplifier U5, the resistor R7 is connected to the 2nd pin of the bio-amplifier U5 through the capacitor C13, the resistor R8 is connected to the 3rd pin of the bio-amplifier U5 through the capacitor C14, the 6th pin of the bio-amplifier U5 is respectively connected to the processor, and the 4th pin of the bio-amplifier U5 is grounded; Wherein, two ends of the capacitor C11 are connected to the resistor R7 and the resistor R8 respectively; One end of capacitor C9 and capacitor C10 are connected to the ground, and the other end is connected to resistor R7 and resistor R8 respectively; The two ends of the resistor R3 and the resistor R4 are connected in series to one end of the capacitor C13 and the capacitor C14 respectively, and the two ends of the resistor R1 and the resistor R2 are connected in series to the other end of the capacitor C13 and the capacitor C14 respectively, and the center point of the resistor R3 and R4 is connected to the center point of the resistor R1 and R2, so as to provide a bias voltage for the electric amplifier U5; The common-mode driving circuit includes an amplifier U4-A and an amplifier U4-B, wherein the output end of the amplifier U4-A is connected to the inverting input end of the amplifier U4-B, the non-inverting input end of the amplifier U4-A is connected to the common-mode signal of the bioelectric amplifier, and the output end of the amplifier U4-B is connected to the common-mode driving electrode, wherein: The non-inverting input terminal of amplifier U4-A is connected to the common mode signal; The negative phase input terminal of amplifier U4-A is connected to the output pin to form a follower circuit; The non-inverting input terminal of the amplifier U4-B is grounded, and a resistor R31 and a capacitor C23 are connected in series between the inverting input terminal and the output terminal, and the resistor R31 and the capacitor C23 are also connected to a resistor R30.

2. A multifunctional digital electroencephalograph according to claim 1, characterized in that: The sensing circuit includes a capacitor C8, and the 9th pin and the 10th pin of the sensor U4 are connected to a power source and a filter capacitor.

3. A multifunctional digital electroencephalograph according to claim 1, characterized in that: The processor is a Cortex-M4 microcontroller.

4. A multifunctional digital electroencephalograph according to claim 1, characterized in that: The memory adopts a non-volatile memory with a capacity of 8 GB.

5. A multifunctional digital electroencephalograph according to claim 1, characterized in that: The Bluetooth module is Bluetooth 5.3.

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