Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A wristband pulse wave detection system and detection method based on bioimpedance

A bio-impedance and detection system technology, applied in catheters and other directions, can solve the problems of not considering individual differences and universality, difficult to control the size of pulse wave pressure, skin discomfort during detection time, etc., to achieve micro power consumption, low cost, elimination of The effect of individual differences

Inactive Publication Date: 2018-03-27
TIANJIN UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of realizing the present invention, the inventor found that in the existing pulse wave measurement method, the method of photoplethysmography pulse wave needs a power light-emitting tube, which consumes a lot of power, and is generally used to realize a single short-time measurement of the pulse wave It is difficult to control the pressure in the pulse wave measured by the piezoelectric method, and it has high requirements for the tester and the subject; in the way of detecting the pulse wave by bioimpedance, the human body impedance is generally measured directly, without considering individual differences and common Adaptability, and the circuit is not simple enough, the power consumption is high, and there are metal electrodes or Ag-Agcl patch electrodes that limit the detection time and cause discomfort to the skin

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
  • A wristband pulse wave detection system and detection method based on bioimpedance
  • A wristband pulse wave detection system and detection method based on bioimpedance
  • A wristband pulse wave detection system and detection method based on bioimpedance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A wristband type pulse wave detection system based on bioimpedance, see figure 1 , The detection system includes: excitation signal 1, half-arm automatic balancing bridge circuit 2, instrument differential amplifier circuit (IA) 3, oversampling and fast digital phase-locking circuit 4, feedback balance adjustment circuit 5 and wristband electrode 6.

[0037] Among them, the excitation signal 1 is two high-frequency sinusoidal voltage excitation signals with the same frequency and opposite phases.

[0038] The bridge arm of the half-arm automatic balancing bridge circuit 2 is composed of a fixed reference resistance and human body biological impedance, and the output signal V i . The purpose of the half-arm automatic balancing bridge circuit 2 is to reduce the huge difference caused by the static basic impedance, thereby improving the dynamic range and measurement accuracy.

[0039] The two input signals of the instrument differential amplifier circuit 3 are signal V ...

Embodiment 2

[0044] The bioimpedance-based wristband pulse wave detection system in Embodiment 1 is further described below in conjunction with specific device models, see below for details:

[0045] In the embodiment of the present invention, the microprocessor used is a low-power consumption microprocessor CY8C3866AXI; the analog-to-digital converter ADC is 11bit, the sampling rate is 200Ksps, and the oversampling multiple is 4.

[0046] The instrument differential amplifier circuit 3 is composed of a programmable gain amplifier. When the feedback balance adjustment circuit 5 reaches a balanced state, the gain of the programmable amplifier is appropriately increased, and the impedance pulse wave signal can be demodulated at this time. The balanced terminal DAC in the feedback balance adjustment circuit 5 is specifically a digital-to-analog converter.

[0047] Among them, the wrist electrode 6 is specifically an elastic electrode made of conductive rubber, which can be in good contact wit...

Embodiment 3

[0051] The basic principle of a wristband pulse wave detection method based on bioimpedance is described as follows, see figure 2 The schematic diagram shown, first of all, this method is a half-arm bridge balance method, which can also be called a differential modulation method. The half-arm modulation means that half of the bridge is a fixed constant resistance R, and the other half is the wrist biological Impedance Z. The embodiment of the present invention is described by using a microprocessor to generate two high-frequency sinusoidal voltage excitation signals to realize fast digital phase-locking as an example.

[0052] 101: The microprocessor generates two high-frequency sinusoidal voltage excitation signals with the same frequency and opposite phases, which are respectively expressed as V i1 (t) and V i2 (t);

[0053] Among them, the voltage excitation signal is a 50KHz high-frequency sine wave with completely opposite phases, and the midpoint of the two arms is s...

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 bio-impedance-based wristband pulse wave detection system and a detection method thereof. The invention combines oversampling and digital phase-locking to realize an automatic balance bridge method for detecting pulse waves. Instrument differential amplifier circuit, the two input signals are the signal Vi and the sinusoidal voltage signal used to adjust the balance generated by the balance terminal in the feedback balance adjustment circuit; the feedback balance adjustment circuit is demodulated according to the oversampling and fast digital phase-locking circuit The voltage amplitude of the initial pulse wave signal controls the amplitude of the sinusoidal voltage signal generated by the balance terminal, and continuously adjusts the phase of the sinusoidal voltage signal until the voltage amplitude of the demodulated new pulse wave signal enters the preset balance Within the threshold, the feedback balance adjustment circuit enters a balanced state. The invention realizes the dynamic detection of the wrist pulse wave by the automatic balancing electric bridge method, and has the characteristics of simple circuit, low power consumption, low cost, high comfort, high precision and long-term monitoring.

Description

technical field [0001] The invention relates to the field of pulse wave detection, in particular to a bioimpedance-based wristband pulse wave detection system and a detection method thereof. Background technique [0002] Long-term dynamic monitoring of pulse waves can provide a wealth of medical information for the subject, and thus has attracted widespread attention from the academic community. In the pulse wave detection process, a good detection method is an important link. Only by ensuring the accuracy of the collected signal is it meaningful for further signal processing. The pulse wave is a weak and low-frequency biomedical signal. It can be detected in the wrist, fingertips, earlobe and other parts. Generally, it needs various complex circuits such as amplifier circuits, filter circuits, and detection and demodulation circuits. The pulse wave dynamic detection device has high requirements for small size, low power consumption, high precision, robustness and comfort. ...

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 Patents(China)
IPC IPC(8): A61B5/02
Inventor 李刚贺建满刘洋林凌
Owner TIANJIN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com