CN214549391U - Near-infrared brain blood oxygen signal and electroencephalogram signal measuring synchronization device - Google Patents
Near-infrared brain blood oxygen signal and electroencephalogram signal measuring synchronization device Download PDFInfo
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- CN214549391U CN214549391U CN202120040562.4U CN202120040562U CN214549391U CN 214549391 U CN214549391 U CN 214549391U CN 202120040562 U CN202120040562 U CN 202120040562U CN 214549391 U CN214549391 U CN 214549391U
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Abstract
The utility model discloses a near-infrared brain blood oxygen signal and brain electrical signal synchronous device, which comprises a brain electrical signal acquisition circuit, a brain blood oxygen signal acquisition circuit, an analog-to-digital conversion module and an MCU signal processing module; the electroencephalogram signal acquisition circuit comprises an electroencephalogram signal acquisition module and a first analog signal amplification and filtering module; the cerebral blood oxygen collection module comprises a laser driving module, a laser emitting module, a photoelectric conversion module and a second analog signal amplification filtering module; the output end of the electroencephalogram signal acquisition module is sequentially connected with the first analog signal amplification and filtering module, the analog-to-digital conversion module and the MCU signal processing module; the output end of the photoelectric conversion module is sequentially connected with the second analog signal amplification and filtering module, the analog-to-digital conversion module and the MCU signal processing module, and the output end of the MCU signal processing module is connected with the laser emission module through the laser driving module. The brain blood oxygen signal and the brain electrical signal can be detected simultaneously, and the detection precision and accuracy are improved.
Description
Technical Field
The utility model relates to a near-infrared measurement brain blood oxygen signal and EEG signal synchronizer.
Background
The brain is the most important part of human body, the signal research on the brain is always a research hotspot, electroencephalogram (EEG) signals have good time resolution but no good spatial resolution, and the blood activity and metabolism conditions of the brain can be observed better in space by adopting a near infrared spectroscopy (NIRS) technology, so that the electroencephalogram signals and brain blood oxygen signals are mutually complemented in space and time.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide one kind and can detect brain blood oxygen signal and EEG signal simultaneously, can realize the complementary detection in brain signal time and space, improve the near-infrared measurement brain blood oxygen signal and the EEG signal synchronizer that detect precision and degree of accuracy.
The purpose of the utility model is realized through the following technical scheme: a near-infrared brain blood oxygen signal and electroencephalogram signal measurement synchronizing device comprises an electroencephalogram signal acquisition circuit, a brain blood oxygen signal acquisition circuit, an analog-to-digital conversion module and an MCU signal processing module;
the electroencephalogram signal acquisition circuit comprises an electroencephalogram signal acquisition module and a first analog signal amplification and filtering module; the cerebral blood oxygen collection module comprises a laser driving module, a laser emitting module, a photoelectric conversion module and a second analog signal amplification filtering module;
the output end of the electroencephalogram signal acquisition module is sequentially connected with the first analog signal amplification and filtering module, the analog-to-digital conversion module and the MCU signal processing module; the output end of the photoelectric conversion module is sequentially connected with the second analog signal amplification and filtering module, the analog-to-digital conversion module and the MCU signal processing module, and the output end of the MCU signal processing module is connected with the laser emission module through the laser driving module.
The MCU signal processing module adopts CY8C4247LQI-BL483, and the analog-to-digital conversion module adopts ADS 8354.
The photoelectric conversion module adopts an OPT101 chip to realize conversion between optical signals and electric signals.
The electroencephalogram signal acquisition module adopts an AD8422 chip, and the first analog signal amplification filtering module adopts AD8639 and THS4521 chips.
The laser driving module adopts an ADN2830 chip.
The utility model has the advantages that: the utility model discloses can detect brain blood oxygen signal and EEG signal simultaneously, can realize the complementary detection in brain signal time and space, improve and detect precision and degree of accuracy.
Drawings
FIG. 1 is a block diagram of the device for synchronizing a near-infrared measurement of a cerebral blood oxygen signal and an electroencephalogram signal according to the present invention;
FIG. 2 is a circuit diagram of the MCU signal processing module of the present invention;
fig. 3 is a circuit diagram of a photoelectric conversion module according to the present invention;
FIG. 4 is a circuit diagram of the electroencephalogram signal acquisition module of the present invention;
fig. 5 is a circuit diagram of the laser driving module of the present invention;
fig. 6 is a circuit diagram of the power module of the present invention.
Detailed Description
The technical scheme of the utility model is further explained in the following with the attached drawings.
As shown in fig. 1, the near-infrared brain blood oxygen signal and electroencephalogram signal synchronous device of the present invention comprises an electroencephalogram signal acquisition circuit, a brain blood oxygen signal acquisition circuit, an analog-to-digital conversion module and an MCU signal processing module;
the electroencephalogram signal acquisition circuit comprises an electroencephalogram signal acquisition module and a first analog signal amplification and filtering module; the cerebral blood oxygen collection module comprises a laser driving module, a laser emitting module, a photoelectric conversion module and a second analog signal amplification filtering module;
the output end of the electroencephalogram signal acquisition module is sequentially connected with the first analog signal amplification and filtering module, the analog-to-digital conversion module and the MCU signal processing module; the output end of the photoelectric conversion module is sequentially connected with the second analog signal amplification and filtering module, the analog-to-digital conversion module and the MCU signal processing module, and the output end of the MCU signal processing module is connected with the laser emission module through the laser driving module.
The MCU signal processing module adopts CY8C4247LQI-BL483 of the Seplacian company to synchronously acquire electroencephalogram signals and cerebral blood oxygen signals and control the output of the laser driving chip. The chip CY8C4247LQI-BL483 has the advantages of small size, extremely low power consumption and internal integration of a Bluetooth module, and the circuit is shown in FIG. 2.
The analog-to-digital conversion module adopts ADS 8354.
The photoelectric conversion module adopts an OPT101 chip to realize conversion between optical signals and electrical signals, and a circuit thereof is shown in fig. 3. The OPT101 is an integrated photodiode and a chip built-in transimpedance amplifier, and the output voltage increases linearly with the light intensity. The amplifier is of single or dual power design, enabling use in battery operated devices. Integrating the photodiode and the transimpedance amplifier on a single chip reduces common problems such as leakage current errors, noise and gain peaks due to stray capacitances in a discrete design. And the 0.09 × 0.09inch photodiode works in a light guide mode, can have good linearity and extremely low dark current OPT101 working voltage of 2.7 to 36V, and has the static current of only 120 uA.
The electroencephalogram signal acquisition module adopts an AD8422 chip, the first analog signal amplification and filtering module adopts AD8639 and THS4521 chips, and the circuit is shown in fig. 4.
The laser driving module adopts an ADN2830 chip to control the magnitude of the driving current to realize the power of laser so as to achieve the effect of penetrating through the skull, and the circuit of the laser driving module is shown in figure 5. The distance between the cerebral cortex and the normal layer of the scalp is 15mm-16mm, the distance between the laser emission and the laser reception is set to be 30mm-40mm, and then the cerebral blood oxygen activity of the cerebral cortex in the skull can be measured. The laser light sources selected by the device are semiconductor Laser Diodes (LD) with the wavelength of 850nm, the maximum output power of 30mw and 650nm and the maximum output power of 15mw respectively, and then contact the scalp of the human body through an external single-mode optical fiber, and a receiving end adopts a photodiode. Adjusting the power and the distance between the transmitting and receiving ends we can detect the blood oxygen condition of the cerebral cortex inside the skull. Time-division multiplexing is adopted, namely, the light-emitting sources alternately emit light according to time periods. The light with the wavelength of 650nm and 850nm alternately emits light to measure the blood oxygen of the brain.
The utility model discloses a power adopts SX1308 output 5V voltage, and ADP151-3.3 output 3.3V voltage. The system supplies power by using a small 3.7V lithium battery, and because the required voltage in the system is 5V and 3.3V, the design adopts a domestic power chip SX1308 to boost the voltage of the battery from 3.7V to 5V, as shown in FIG. 6.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention, and it is to be understood that the scope of the invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on the teachings of the present invention without departing from the spirit of the invention, and such modifications and combinations are still within the scope of the invention.
Claims (5)
1. A near-infrared measurement brain blood oxygen signal and EEG signal synchronizer which characterized in that: the brain blood oxygen signal acquisition circuit comprises an electroencephalogram signal acquisition circuit, a brain blood oxygen signal acquisition circuit, an analog-to-digital conversion module and an MCU signal processing module;
the electroencephalogram signal acquisition circuit comprises an electroencephalogram signal acquisition module and a first analog signal amplification and filtering module; the cerebral blood oxygen collection module comprises a laser driving module, a laser emitting module, a photoelectric conversion module and a second analog signal amplification filtering module;
the output end of the electroencephalogram signal acquisition module is sequentially connected with the first analog signal amplification and filtering module, the analog-to-digital conversion module and the MCU signal processing module; the output end of the photoelectric conversion module is sequentially connected with the second analog signal amplification and filtering module, the analog-to-digital conversion module and the MCU signal processing module, and the output end of the MCU signal processing module is connected with the laser emission module through the laser driving module.
2. The near-infrared brain blood oxygen signal and electroencephalogram signal measuring synchronization device according to claim 1, characterized in that: the MCU signal processing module adopts CY8C4247LQI-BL483, and the analog-to-digital conversion module adopts ADS 8354.
3. The near-infrared brain blood oxygen signal and electroencephalogram signal measuring synchronization device according to claim 1, characterized in that: the photoelectric conversion module adopts an OPT101 chip to realize conversion between optical signals and electric signals.
4. The near-infrared brain blood oxygen signal and electroencephalogram signal measuring synchronization device according to claim 1, characterized in that: the electroencephalogram signal acquisition module adopts an AD8422 chip, and the first analog signal amplification filtering module adopts AD8639 and THS4521 chips.
5. The near-infrared brain blood oxygen signal and electroencephalogram signal measuring synchronization device according to claim 1, characterized in that: the laser driving module adopts an ADN2830 chip.
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| CN202120040562.4U CN214549391U (en) | 2021-01-08 | 2021-01-08 | Near-infrared brain blood oxygen signal and electroencephalogram signal measuring synchronization device |
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| CN202120040562.4U CN214549391U (en) | 2021-01-08 | 2021-01-08 | Near-infrared brain blood oxygen signal and electroencephalogram signal measuring synchronization device |
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