Blood volume measuring method, blood volume measuring device, and program

By measuring the instantaneous value and the average of the biological information parameters in real time, the cardiac output in the blood volume measurement method is calculated, which solves the problems of insufficient responsiveness and long calibration time in the prior art, and realizes efficient monitoring and accurate calculation of cardiac dynamics changes.

JP2025063738APending Publication Date: 2025-04-16NIHON KOHDEN CORP
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Patent Information

Application Number
JP2023173167
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-10-04
Publication Date
2025-04-16

AI Technical Summary

Technical Problem

Existing blood volume measurement methods are susceptible to instantaneous noise when monitoring cardiac dynamics changes, resulting in inadequate response in calculating cardiac output and long calibration time, which increases the burden on bject and users.

Method used

The instantaneous value of the biological information parameters required to measure the cardiac output in real time, and the transfer average is measured multiple times within a predetermined time period. When the threshold is reached, the overall average is calculated, which is used to calibrate the unique subject coefficient and then calculate the cardiac output.

Benefits of technology

It improves responsiveness to cardiac dynamics changes, reduces calibration time, reduces burden on subject and users, and ensures accurate calculation of cardiac output.

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Abstract

To provide a blood volume measuring method, a blood volume measuring device, and a program capable of performing calibration at an appropriate timing.SOLUTION: A blood volume measuring method for calculating cardiac output includes: an instantaneous value measurement step of measuring an instantaneous value of a first biological information parameter including at least one of a pulse wave propagation time and pulse pressure of a subject; a split movement average value measurement step of measuring a split movement average value a plurality of times in a first predetermined section of a second biological information parameter including at least one of the pulse wave propagation time, a cardiac rate, and pulse pressure of the subject; a whole movement average value calculation step of calculating a whole movement average value, which is an average value of a plurality of the split movement average values when the number of times that the split movement average value is measured in the second predetermined section is a threshold or more in the split movement average value measurement step; a calibration step of calculating a coefficient unique to the subject on the basis of the whole movement average value calculated in the whole movement average value calculation step; and a calculation step of calculating cardiac output on the basis of the instantaneous value and the coefficient unique to the subject calculated in the calibration step.SELECTED DRAWING: Figure 1
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