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Measuring device and method for contact impedance between electrodes and skin

A contact impedance and measuring device technology, applied in diagnostic recording/measurement, medical science, diagnostic signal processing, etc., can solve the problems of sacrificing measurement speed, reducing machine monitoring efficiency, etc., and achieve the effect of improving data quality

Inactive Publication Date: 2017-05-10
FOURTH MILITARY MEDICAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method overcomes the shortcomings of the two-electrode method to a certain extent and improves the measurement accuracy of the electrode-skin contact impedance, it sacrifices the measurement speed and reduces the monitoring efficiency of the machine due to the need to switch electrodes twice.

Method used

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  • Measuring device and method for contact impedance between electrodes and skin
  • Measuring device and method for contact impedance between electrodes and skin
  • Measuring device and method for contact impedance between electrodes and skin

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Embodiment Construction

[0041] The present invention is described in further detail below in conjunction with accompanying drawing:

[0042] see figure 1 , the measuring device of the electrode-skin contact impedance of the present invention comprises a processor, and a current source, a voltage measurement circuit, a display and an alarm all interacting with the processor; The electrode system composed of several electrodes attached to the user's skin surface is connected; wherein,

[0043] The electrode system includes excitation electrodes and measurement electrodes;

[0044] The processor is used to control the selection of the excitation electrode and the measurement electrode, and calculate the contact impedance of the corresponding electrode according to the excitation current and the measured response voltage;

[0045] The current source is used to output a sinusoidal current signal of a specific frequency, and inject an excitation current to the excitation electrode through a multi-way swi...

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Abstract

The invention discloses a measuring device and method for contact impedance between electrodes and skin. The device comprises a processor, a current source, a voltage measuring circuit, a displayer and an alarm. The current source, the voltage measuring circuit, the displayer and the alarm all interact with the processor. The current source and the voltage measuring circuit are connected with an electrode system formed by multiple electrodes and tightly attached to the surface of the skin of a user through a multi-way switch. Excitation currents are injected into the different electrodes, measuring electrodes are selected, and therefore the contact status between all the electrodes and the skin can be obtained in real time. The magnitude of the contact impedance is obtained through calculation through a boundary voltage value and an excitation value, and the contact status of the electrodes is judged according to an averaging method and a threshold value method. According to the method, it is proved through a simulation experiment and a calibration board experiment that the method is superior to an existing measuring technology on the aspects of measuring speed and measuring precision, the requirements of displaying the contact status of all the electrodes in real time in the electrical impedance detection process are met, and the data quality based on an electrical impedance measuring system is further improved.

Description

[0001] 【Technical field】 [0002] The invention belongs to the field of medical monitoring and testing devices, and relates to a device for measuring contact impedance, in particular to a device and method for measuring electrode-skin contact impedance. [0003] 【Background technique】 [0004] Bioelectrodes are widely used in various fields of medical monitoring, such as ECG monitoring, extraction of EEG signals and electrical impedance tomography (EIT) systems, etc. The electrode signal is transmitted to the body surface through human tissue, and is obtained through electrode induction, rear-end signal amplification, voltage measurement circuit and processor processing. In the entire transmission path of electrode signals, human tissue is a good conductor, and its impedance varies from hundreds of ohms to tens of ohms according to different frequencies, while the electrode-skin contact impedance varies from tens of thousands of ohms to hundreds of ohms, so The electrode-skin ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/053
CPCA61B5/053A61B5/6801A61B5/6844A61B5/72A61B5/746
Inventor 史学涛李衡董秀珍付峰夏军营尤富生
Owner FOURTH MILITARY MEDICAL UNIVERSITY
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