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Multi-physiological parameter signal single-channel acquisition amplifier

A technology of physiological parameters and amplifiers, applied in the directions of sensors, medical science, diagnostic recording/measurement, etc., can solve the problems of less research on detection circuits, achieve long-term dynamic monitoring, low cost, and simple structure

Active Publication Date: 2020-02-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of the above have realized the collection of physiological signals, but most of them use complex algorithms to analyze the signals on the basis of the basic circuit, and there are few studies on the detection circuit.

Method used

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  • Multi-physiological parameter signal single-channel acquisition amplifier
  • Multi-physiological parameter signal single-channel acquisition amplifier
  • Multi-physiological parameter signal single-channel acquisition amplifier

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Embodiment 1

[0035] Multiple Physiological Parameter Single Channel Acquisition Amplifier, see figure 1 , the acquisition amplifier includes: excitation signal 1, impedance detection and shaping signal superposition circuit 2, common mode drive circuit 3, parallel differential amplifier circuit 4, high-pass low-pass circuit 5, over-sampling and fast digital phase-locking circuit 6.

[0036] Among them, the excitation signal 1 is two high-frequency square wave excitation signals with the same frequency and opposite phases.

[0037] Impedance detection and shaping signal superimposition circuit 2 is to utilize the reasonable disposition of resistance and capacitance (the selection method of specific capacitance and resistance value refers to embodiment 3), makes its input impedance can satisfy relevant standard when detecting electrocardiogram signal, detects breath for impedance method When the respiratory impedance modulus is lowered by the corresponding multiple, it solves the problem of ...

Embodiment 2

[0045] The physiological parameter signal single-channel acquisition amplifier in Embodiment 1 is further described in combination with specific device models, see the following for details:

[0046] In the embodiment of the present invention, the microprocessor used is STM32F103RET6; the analog-to-digital converter ADC is 12bit, and the sampling rate is 200Ksps.

[0047] Among them, the detection principle of the respiratory signal is as follows: image 3 As shown, U in the figure S Denoted as the excitation signal, Z S Expressed as the external impedance when the excitation terminal is connected in series with the human body, U ecg Expressed as an ECG signal (the main part of the detected human body signal is the central electrical signal), Z d Expressed as contact resistance and various resistances of the human body, Z r Expressed as the resistance of the thoracic impedance as it varies with respiration. Then there are:

[0048]

[0049] because Z S much larger th...

Embodiment 3

[0060] The basic principle of multi-physiological parameter signal single-channel acquisition amplifier is described as follows, see figure 2 As shown in the schematic diagram, first of all, the core of this method lies in the reasonable configuration of resistors and capacitors, using the different modulus values ​​of impedance at different frequencies to balance the problem of impedance and gain when detecting ECG and respiratory signals at the same time. The embodiment of the present invention is described by using a microprocessor to generate two high-frequency square wave voltage excitation signals as an example to realize fast digital phase-locked demodulation, and the first and second signals are respectively an ECG signal and a respiration signal.

[0061] The microprocessor generates two high-frequency square-wave voltage excitation signals with the same frequency and opposite phases, which are respectively denoted as U S1 and U S2 ;

[0062] Among them, the voltag...

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Abstract

The invention discloses a multi-physiological parameter signal single-channel acquisition amplifier. The amplifier comprises: excitation signals which are two paths of high-frequency square wave excitation signals with the same frequency and opposite phases; an impedance detection and forming signal superposition circuit, wherein through configuration of a resistor and a capacitor, different requirements on impedance when a first signal and a second signal are detected at the same time are met; a common-mode driving circuit which is used for converting a common-mode signal caused by reducing impedance mismatching of a device into a differential-mode signal; a parallel differential amplifier circuit which suppresses the common-mode signal; and a high-pass low-pass circuit which is used forfiltering the signal. The amplifier is simple in circuit, low in cost, low in power consumption and capable of achieving long-time dynamic monitoring of electrocardiowaves and respiratory waves.

Description

technical field [0001] The invention relates to the field of physiological signal detection, in particular to a multi-physiological parameter signal single-channel acquisition amplifier, which realizes synchronous detection of electrocardiographic signals and impedance breathing signals. Background technique [0002] ECG signals, EEG signals, and respiratory signals are important parameters that reflect the physiological functions of the human body, and have important reference value in human health monitoring. Such signals are weak signals, easily affected by external interference, and difficult to detect. With people's attention to daily physiological health and the development of information technology, the demand for simple, portable and reliable physiological signal detection equipment continues to increase. [0003] At present, most of the portable ambulatory monitors can only detect ECG signals, and have single functions and traditional structures. Yang Bozhi design...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0402A61B5/085A61B5/0476A61B5/0488
CPCA61B5/085A61B5/318A61B5/369A61B5/389
Inventor 林凌尹帅举李刚
Owner TIANJIN UNIV
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