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Signal acquisition processing circuit for digital brain electrical activity mapping instrument

A signal acquisition and processing circuit technology, applied in electrical components, medical science, impedance network, etc., can solve problems such as poor stability, equipment susceptible to interference, branch imbalance, etc., to improve acquisition sensitivity and stability , the effect of suppressing common mode interference

Active Publication Date: 2012-11-21
CONTEC MEDICAL SYST
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0002] Digital EEG topographer is a non-invasive medical instrument that continuously monitors patients' brain waves. It has become a routine equipment for the examination and monitoring of brain diseases in hospitals. It is also widely used in various mobile monitoring and sleep monitoring outside hospitals. It plays an important role in the diagnosis and treatment of epilepsy, tumor and traumatic brain injury. Since the human body is a high internal resistance signal source, the internal resistance can reach tens of thousands of ohms or even hundreds of thousands of ohms, and its internal impedance is easy to change. Each branch may be unbalanced, so the current equipment is easily disturbed and the stability is not good

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  • Signal acquisition processing circuit for digital brain electrical activity mapping instrument
  • Signal acquisition processing circuit for digital brain electrical activity mapping instrument
  • Signal acquisition processing circuit for digital brain electrical activity mapping instrument

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Embodiment Construction

[0016] An embodiment of a signal acquisition and processing circuit of a digital electroencephalography topographer, the circuit of the signal acquisition and processing circuit connected sequentially from the signal acquisition input includes a follow-up low-pass filter circuit 1, a differential amplifier circuit 2, and a voltage amplifier circuit 3,50 Hz power frequency notch circuit 4, two-stage operational amplifier circuit 5, two-stage active low-pass filter circuit 6, A / D conversion circuit 7, the A / D conversion circuit is connected to a computer with analysis software 9 through a photoelectric isolation circuit 8 Wherein, what A / D conversion circuit adopted is the microprocessor chip MSP430F147 with A / D conversion function, and described voltage amplifying circuit adopts operational amplifier TLC2254CDR or LF444, makes also have very high input impedance when low frequency, thereby It has strong AC coupling capability, the two-stage operational amplifier circuit is a gen...

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Abstract

The invention relates to a signal acquisition processing circuit for a digital brain electrical activity mapping instrument. From signal acquisition input, the signal acquisition processing circuit comprises a follow low-pass filter circuit, a difference amplification circuit, a voltage amplification circuit, a 50Hz power frequency trap circuit, a secondary operation amplification circuit, a second-order active low-pass filter circuit and an A / D conversion circuit which are connected in sequence, wherein the A / D conversion circuit is connected with a computer with analyzing software through an optical isolation circuit. The signal acquisition processing circuit has the beneficial effects that the input impedance can reach over 10 megohms so as to improve the signal acquisition sensitivity; various filter circuits are adopted in signal processing, so that the common-mode interference is effectively inhibited, and the equipment working stability can be improved.

Description

technical field [0001] The invention relates to medical equipment, in particular to a signal acquisition and processing circuit of a digital electroencephalogram topography instrument. The circuit has built-in multi-stage amplification and multi-stage filtering, applies isolation technology, and effectively suppresses common-mode interference. Background technique [0002] Digital EEG topographer is a non-invasive medical instrument that continuously monitors patients' brain waves. It has become a routine equipment for the examination and monitoring of brain diseases in hospitals. It is also widely used in various mobile monitoring and sleep monitoring outside hospitals. It plays an important role in the diagnosis and treatment of epilepsy, tumor and traumatic brain injury. Since the human body is a high internal resistance signal source, the internal resistance can reach tens of thousands of ohms or even hundreds of thousands of ohms, and its internal impedance is easy to ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H7/01A61B5/0476
Inventor 胡坤刘晨亮王会颖
Owner CONTEC MEDICAL SYST
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