Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Quick acquiring method for multi-frequency-point bioelectrical impedance

A bioelectrical impedance and acquisition method technology, which is applied in medical science, sensors, diagnostic recording/measurement, etc., can solve the problems of unsatisfactory autocorrelation, increase the amount of calculation and complexity of the system, and take a long time to improve anti-interference energy, reduce design difficulty, and reduce the effect of computation

Active Publication Date: 2014-11-19
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
View PDF7 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Bioelectrical impedance measurement technology has experienced the evolution of measurement technology from direct current to alternating current, from pure resistance to complex impedance, and from single-frequency point to multi-frequency point. However, the current mainstream multi-frequency bioelectrical impedance measurement method still belongs to time-sharing single-frequency The measurement method, which scans the impedance of the organism successively from low frequency to high frequency, takes a long time, and because the physiological state of the organism is affected by the heartbeat and blood flow, the time-sharing single-frequency measurement method cannot accurately reflect the biological state at a certain moment. Spectrum information of bioimpedance
[0004] The Chinese patent application No. CN103705236 published on April 9, 2014 discloses a method for synchronous rapid measurement of bioelectrical impedance spectrum, which uses FPGA to realize a multi-frequency synchronous excitation signal source based on Walsh function and the corresponding bioimpedance The anti-acquisition method, but because the Walsh function signal has some disadvantages compared with the traditional sinusoidal signal, its autocorrelation is not ideal, and the sidelobe value of the spectrum is large, so that on the one hand, false synchronization will be generated, and on the other hand, the method can obtain excitation The frequency accuracy of the source is limited, so it is necessary to increase the number of DFT points when extracting impedance, and at the same time increase the correction algorithm to solve the error caused by the DFT fence effect, which will greatly increase the amount of computation and complexity of the system

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Quick acquiring method for multi-frequency-point bioelectrical impedance
  • Quick acquiring method for multi-frequency-point bioelectrical impedance
  • Quick acquiring method for multi-frequency-point bioelectrical impedance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] like figure 1 , figure 2 As shown, a method for quickly acquiring multi-frequency point bioelectrical impedance, constructing a multi-channel direct frequency synthesizer DDS on an FPGA, and synthesizing the single-frequency signals output by the multi-channel direct frequency synthesizer DDS into multi-frequency points through an adder circuit Composite excitation source V in , using an automatic balancing bridge to combine the multi-frequency point composite excitation source V in Simultaneously loaded to the reference resistor R ref and the electrical impedance Z of the organism to be measured x , and then use a dual-channel synchronous analog-to-digital conversion chip to convert the reference resistor R ref The voltage on V ref , the electrical impedance Z of the organism to be measured x The voltage on V x converted into a digital signal;

[0020] Select the reference resistor R ref The voltage on V ref and the electrical impedance Z of the organism to ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a quick acquiring method for multi-frequency-point bioelectrical impedance. A multi-frequency-point composite excitation source Vin is realized based on a DDS (direct digital synthesizer) principle by means of FPGA (field-programmable gate array) programming, the composite excitation source Vin is loaded onto reference resistance Rref and to-be-tested organism electric impedance Zx simultaneously, corresponding amplitudes Ampref and Ampx and phase angles Degref and Degx of the Vref and Vx on frequency points can be acquired accurately by reasonably selecting sampling frequency fs and points N of DFT (digital Fourier transform) and by only performing DFT on the Vref and Vx on the several needed frequency points, and further amplitudes of the to-be-tested organism electric impedance Zx on the frequency points are acquired. The quick acquiring method has the advantages of high impedance acquisition accuracy, small operation amount, high anti-jamming capability, short scanning time and the like.

Description

technical field [0001] The invention relates to the field of biological characteristic signal extraction methods, in particular to a method for rapidly acquiring multi-frequency point bioelectrical impedance. Background technique [0002] Bioelectrical impedance technology: a non-invasive detection technology that uses the electrical characteristics of biological tissues and organs to extract biological and physiological information. It uses the electrodes placed on the body surface to input a weak detection current to the organism, and then measures the voltage change of the appropriate part, so as to obtain the electrical impedance transformation of the relevant tissues or organs, so as to obtain physiological and pathological information. This technique is widely used in modern medicine because of its non-invasive, safe, and low-cost advantages, mainly including: reactance blood flow diagram, human body impedance imaging, and body composition measurement. [0003] Bioele...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/053
Inventor 王远徐玉兵余洪龙刘冰马彪彪曹庆庆张永亮周旭孙怡宁杨先军马祖长
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products