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Vital sign monitoring device and method

A vital sign and monitoring device technology, applied in diagnostic recording/measurement, medical science, diagnosis, etc., can solve problems such as difficult breathing and heartbeat signal detection, and poor signal-to-noise ratio of output signal, and achieve low manufacturing cost, easy signal, easy-to-achieve effects

Active Publication Date: 2019-12-13
武汉凯锐普医疗科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, the signal-to-noise ratio of the optical fiber sagnac ring is very poor for the output signal generated by the non-violent vibration, and it is not sensitive to low-frequency signals, so it is difficult to be used for the detection of breathing and heartbeat signals.

Method used

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  • Vital sign monitoring device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The present embodiment provides a method for monitoring vital signs based on an optical fiber unbalanced sagnac ring, comprising the following steps:

[0041] S1. Input the optical signal into the vital signs monitoring device;

[0042] S2, suppose the light intensity of the optical signal input by the 2 * 2 fiber coupler is I 0 , the light intensity of the optical signal output by the 2×2 fiber coupler is I, and the splitting ratio of the 2×2 fiber coupler is α. and counterclockwise two paths, record the intensity of the optical signal of the two paths as I 1 and I 2 , when the unbalanced sagnac ring is not disturbed by vibration, the phase difference of the two optical signals is When there is vibration interference in the unbalanced sagnac ring, the phase difference of the two optical signals is Then there are:

[0043] When there is no vibration disturbance,

[0044] When there is vibration interference,

[0045] Among them, I 1 =αI 0 , I 2 =(1-α)I ...

Embodiment 2

[0054] On the basis of Embodiment 1, in this embodiment, the unbalanced sagnac ring is spliced ​​by a single-mode optical fiber and a dispersion-shifted optical fiber, and the length and ratio of the two optical fibers are not limited.

[0055] In this embodiment, due to the unbalanced structure of the unbalanced sagnac ring, even in the case of no vibration, It is not zero, which is equivalent to raising the output optical power of the unbalanced sagnac ring coupling end in advance, so that the change of the phase difference is easier to appear, which is beneficial to the dynamic response to the vibration signal, and this embodiment is for The value of is not limited. When vibration occurs, the unbalance of the unbalanced sagnac ring cavity is further increased, and the original unbalanced ring cavity structure amplifies the optical path difference between the two paths of light transmitted in reverse, resulting in two paths The phase shift of the optical signal propagatin...

Embodiment 3

[0058] On the basis of Embodiment 1 or Embodiment 2, in this embodiment, the unbalanced sagnac ring is formed by splicing a multimode optical fiber and a dispersion compensating optical fiber, and the length and ratio of the two optical fibers are not limited.

[0059] Such as figure 2 As shown, the unbalanced sagnac ring spliced ​​by multimode fiber and dispersion compensating fiber is quite sensitive to small vibrations and is suitable for vital sign detection.

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Abstract

The invention provides a vital sign monitoring device and method. By means of an unbalanced structure of an unbalanced sagnac ring, the phase difference of two paths of light in the ring is not zero under the condition of no vibration, equivalently, the output light power of the output end of the unbalanced sagnac ring is raised in advance, the change of the phase difference can be displayed moreeasily, and dynamic response to vibration signals is facilitated. When vibration occurs, the unbalance of an unbalanced sagnac ring cavity is further increased, the phase shift of two paths of oppositely propagated optical signals is increased, after interference of a coupler, the output end outputs a signal modulated by vibration, and at the moment, the unbalanced sagnac ring is also quite sensitive to small-amplitude vibration and is suitable for vital sign detection.

Description

technical field [0001] The invention relates to the field of monitoring human vital signs, in particular to a vital sign monitoring device and method. Background technique [0002] With the development of social economy and technology and the improvement of people's requirements for quality of life, people's demand for testing their own health is increasing. Respiratory rate and heart rate are the most basic vital signs of the human body. Morbid signs of the human body are often reflected in abnormal respiration rate and heart rate. Therefore, daily real-time monitoring of respiration rate and heart rate is of great significance for human health assessment and disease prevention . In recent years, the use of optical principles to detect vital signs has developed rapidly, and the optical fiber sagnac ring based on the principle of interference is a better method for detecting vibration signals. Because the heartbeat will cause the micro-vibration of the arteries and vessels...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0205A61B5/00
CPCA61B5/0059A61B5/0205A61B5/0066A61B5/02416A61B5/02427A61B5/0816
Inventor 李政颖黄国良赵涛
Owner 武汉凯锐普医疗科技有限公司
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