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Non-contact measurement method of key physiological parameters

A physiological parameter, non-contact technology, applied in the measurement of pulse rate/heart rate, diagnostic recording/measurement, medical science, etc., to achieve the effect of small size and easy operation

Inactive Publication Date: 2007-08-01
THE CHINESE UNIVERSITY OF HONG KONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] As can be seen from the previous review, there is currently no device that can perform non-interfering non-contact continuous monitoring of multiple key physiological parameters, especially the measurement of blood pressure

Method used

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  • Non-contact measurement method of key physiological parameters
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  • Non-contact measurement method of key physiological parameters

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Experimental program
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Effect test

Embodiment 1

[0044] Blood pressure is calculated using pulse wave transit time. Many documents and patents have introduced the method of calculating blood pressure using the theory of pulse wave transit time. Pulse wave transit time is the time difference between a pulse arriving at two different points as it travels along the same artery. This time delay has been proved to be related to blood pressure, and it will decrease with the increase of blood pressure. Therefore, by using a standard blood pressure instrument to calibrate the relationship between the pulse wave transit time and blood pressure, that is to find the relationship between the pulse wave transit time and blood pressure. This time can then be used to estimate the blood pressure value. For the specific calculation method, please refer to US Patent Nos. 4,869,262 and 5,649,543, etc., which will not be repeated here.

Embodiment 2

[0046] The blood pressure is estimated by using other characteristic quantities related to the pulse wave, such as the characteristic value of the photoplethysmographic signal itself. In this case, non-contact continuous arterial blood pressure measurement can be achieved without utilizing bioelectrical signals. Fig. 9 gives the definitions of some characteristic values ​​of photoplethysmographic signals. Since this application focuses on the measurement of non-contact physiological parameters, the method will not be described in detail here, and its relevant information can be obtained from the references [8-11] in the appendix.

Embodiment 3

[0048] Another way to calculate blood pressure is to correct the photoplethysmographic signal waveform with the upper arm blood pressure waveform. Therefore, only one series of waveforms, that is, one sensor, is used to obtain blood pressure information. Published literature points out that there is a certain relationship between the waveform of radial artery blood pressure and the waveform of the photoplethysmography signal obtained from the finger, see literature [12,13], and this relationship can be expressed by a transfer function. The transfer function can be obtained by comparing the radial artery blood pressure waveform with a device capable of continuous blood pressure measurement from the wrist and comparing it with the photoplethysmography signal waveform, and the calibration step is completed. It should be pointed out that this calibration process is object-dependent. Therefore, each user should be calibrated separately before use. The specific calculation method ...

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Abstract

The invention relates to a method for measuring key physiological parameters in noncontact manner, such as blood pressure and its change rate, electrocardiogram, blood oxygen saturation, respiratory frequency, and heart rate and its change rate. The key physiological parameters can be measured by analyzing plethysmographic signals and bioelectric signals collected by a sensor or a probe without contacting human body. The device adopted in the method has wider application scope than the conventional contact measurements, can be applied in particular environments such as mobile ambulance or battle field treatment, and can also be integrated in auxiliary facilities such as bathtub, bed and coach in everyday life. The device has the advantages of simple and easy operation, no affect to users' activities during measurements of physiological parameters, and no requirement of active intervention of users, and can provide safe, economical and practical, nondestructive real time continuous monitoring of physiological parameters for users.

Description

field of invention [0001] The invention relates to the monitoring of multiple physiological parameters, in particular to the real-time non-contact continuous monitoring of multiple key physiological parameters. Background technique [0002] The monitoring of physiological parameters, especially the monitoring of changes in key physiological parameters reflecting the function of the cardiovascular system can provide users with timely information feedback in order to understand their health conditions. For middle-aged and elderly people, cardiovascular and cerebrovascular diseases are one of the diseases that pose the greatest threat to health. Statistics from the American Heart Association show that 16,600,000 people worldwide die from cardiovascular disease every year, and it has become the number one killer of human health. In China, the current mortality rate due to cardiovascular and cerebrovascular diseases accounts for 34.5% of the total population mortality, and it is...

Claims

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Application Information

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IPC IPC(8): A61B5/00A61B5/024A61B5/04
Inventor 张元亭滕晓菲
Owner THE CHINESE UNIVERSITY OF HONG KONG
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