Method and device for calculating arterial oxygen saturation through addition of dual-wavelength absolute differences

An absolute difference, dual-wavelength technology, applied in the field of arterial oxygen saturation calculation, can solve the problems of reduced optical path length, complicated calculation, difficult pulse wave positioning, etc. Ability-enhancing effect

Active Publication Date: 2016-11-23
TIANJIN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0012] The invention provides a method and device for calculating arterial blood oxygen saturation by summing the absolute difference of dual wavelengths. The invention solves the problems of low calculation efficiency in the frequency domain extraction method, inability to effectively evaluate during calculation, and overcoming the influence of abnormal waveforms, etc. Insufficient; at the same t

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  • Method and device for calculating arterial oxygen saturation through addition of dual-wavelength absolute differences
  • Method and device for calculating arterial oxygen saturation through addition of dual-wavelength absolute differences
  • Method and device for calculating arterial oxygen saturation through addition of dual-wavelength absolute differences

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Embodiment 1

[0064] In order to solve the deficiencies in the dynamic spectrum frequency domain extraction method, the time domain single shot extraction method and the time domain difference value extraction method, the embodiment of the present invention provides a method for calculating the arterial blood oxygen saturation by summing the absolute difference of two wavelengths, see figure 1 , see the description below:

[0065] 101: Using the time-domain difference extraction method to extract the difference between two adjacent sampling points before and after the logarithmic photoplethysmography, and take the absolute value of the difference, and obtain a dual-wavelength absolute difference sequence by screening;

[0066] 102: Sequentially extract a number of absolute differences at positions corresponding to the dual wavelengths to obtain multiple sets of dual-wavelength absolute difference sequences, and perform normalization on each set of dual-wavelength absolute difference sequenc...

Embodiment 2

[0080] Combine below figure 1 , figure 2 , the scheme in embodiment 1 is further introduced, see the following description for details:

[0081] 201: Synchronously collect photoplethysmography waves under two different wavelength light sources within a period of time and take logarithms to obtain logarithmic photoplethysmography waves at two wavelengths;

[0082] Wherein, the concrete operation of step 201 comprises the following steps:

[0083] The two light sources with different wavelengths may be anti-parallel light emitting diodes, common anode light emitting diodes or common cathode light emitting diodes, which are not limited in this embodiment of the present invention during specific implementation.

[0084] In practical applications, the manner of driving the LEDs may be time-division driving or frequency-division driving, which is not limited in this embodiment of the present invention.

[0085] Further, the manner of driving the above light-emitting diodes may b...

Embodiment 3

[0119] An embodiment of the present invention provides a device for calculating the arterial blood oxygen saturation by summing the absolute difference of two wavelengths, the device is partly corresponding to the methods in Examples 1 and 2, see Figure 5 , the device consists of:

[0120] The first acquisition module 1 uses the time-domain difference extraction method to extract the difference between two adjacent sampling points before and after the logarithmic photoplethysmography, and takes the absolute value of the difference, and obtains the dual-wavelength absolute difference by screening sequence;

[0121] The second acquisition module 2 is used to sequentially extract a number of absolute differences at the corresponding positions of the dual wavelengths to obtain multiple sets of dual-wavelength absolute difference sequences, and to normalize each set of dual-wavelength absolute difference sequences to obtain normalized absolute differences sequence of values;

[...

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Abstract

The invention discloses a method and device for calculating arterial oxygen saturation through addition of dual-wavelength absolute differences. The method comprises the steps of extracting differences between two adjacent sampling points of logarithmic pulse oximeter signals, obtaining an absolute value of the differences, and obtaining a dual-wavelength absolute difference sequence through screening; sequentially extracting a plurality of absolute values of the corresponding positions of dual-wavelengths to obtain a plurality of sets of dual-wavelength absolute difference value sequences, performing normalization on each dual-wavelength absolute difference value sequence, and obtaining a normalized absolute difference value sequence; according to the k sigma criterion, removing normalization absolute values with large errors, and overlaying the values obtained after removal to be used as addition of absolute values of final pulse oximeter signals; building a correction model of truth values of the arterial oxygen saturation and addition of the absolute difference value of pulse oximeter signals; by means of the correction model, the arterial oxygen saturation is calculated. According to the method and device, collected spectroscopic data is more sufficiently utilized, and the dynamic spectrum noninvasive blood component detection precision is remarkably improved.

Description

technical field [0001] The invention relates to the field of calculation of arterial blood oxygen saturation, in particular to a method and a device thereof for calculating arterial blood oxygen saturation by summing absolute differences of two wavelengths. Background technique [0002] The existing non-invasive pulse oximeter has the problems of low measurement accuracy and limited real-time detection. The main reason is that the current pulse oximeter uses traditional approximate calculation, and the measurement accuracy is affected by individual differences and measurement conditions. Among the many methods for detecting pulse oximetry, the detection method of pulse oximetry based on the principle of dynamic spectroscopy can theoretically eliminate the interference of optical backgrounds such as skin and fat on the measurement of arterial blood spectrum. [0003] The basic principle of dynamic spectroscopy is: use light in the visible and near-infrared bands to irradiate...

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Application Information

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IPC IPC(8): A61B5/1455
CPCA61B5/14551A61B5/7203A61B5/7235
Inventor 林凌代文婷王怀乐李刚
Owner TIANJIN UNIV
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