Single position non-invasive calibration technique
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United States of America Patent
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May 30, 1989
Issued Date -
N/A
app pub date -
Oct 9, 1987
filing date -
Jan 21, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved method for calibating a non-invasive apparatus for measuring respiration volume of the type wherein signals indicative of the rib cage and abdomen contributions to respiration volume are provided, and wherein at least one of the signals is multiplied by a predetermined weighting factor for reflecting the relative contributions of the rib cage and abdomen to respiration volume. The calibration method non-invasively determines the weighting factor by: totaling, during a period of breathing, a plurality of values of a parameter indicative of the relative amplitude, for each breath, of uncalibrated rib cage and abdomen signals; and dividing the average variability of the means of the total of the values of one of the rib cage and abdomen signals by the average variability of the mean of the tota of the values of the other signal. The quotient so derived represents the weighting factor. An apparatus for calibrating in accordance with the method is also disclosed.
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