Single position non-invasive calibration technique
First Claim
1. An apparatus for calibrating a non-invasive apparatus for measuring a subject'"'"'s respiration volume, said measuring apparatus being of the type including means for providing a signal responsive to a rib cage dimension indicative of rib cage contribution to respiration volume, means for providing a signal responsive to an abdominal dimension indicative of abdominal contribution to respiration volume, and means for multiplying at least one of said rib cage and abdominal signals by a predetermined weighting factor for reflecting the relative contributions of said rib cage and abdomen to respiration volume, said calibrating apparatus comprising:
- means for separately totaling the delta values for said rib cage and abdominal signals over a baseline period of substantially steady state breathing;
means for dividing the average variability of the mean of the total of said delta values for one of said rib cage or abdominal signals by the average variability of the mean of the total of said delta values for the other signal; and
means for adjusting said multiplying means for multiplying said other signal by the quotient determined by said dividing means.
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Accused Products
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.
94 Citations
10 Claims
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1. An apparatus for calibrating a non-invasive apparatus for measuring a subject'"'"'s respiration volume, said measuring apparatus being of the type including means for providing a signal responsive to a rib cage dimension indicative of rib cage contribution to respiration volume, means for providing a signal responsive to an abdominal dimension indicative of abdominal contribution to respiration volume, and means for multiplying at least one of said rib cage and abdominal signals by a predetermined weighting factor for reflecting the relative contributions of said rib cage and abdomen to respiration volume, said calibrating apparatus comprising:
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means for separately totaling the delta values for said rib cage and abdominal signals over a baseline period of substantially steady state breathing; means for dividing the average variability of the mean of the total of said delta values for one of said rib cage or abdominal signals by the average variability of the mean of the total of said delta values for the other signal; and means for adjusting said multiplying means for multiplying said other signal by the quotient determined by said dividing means. - View Dependent Claims (2, 3)
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4. A method for calibrating an apparatus for non-invasively measuring a subject'"'"'s respiration volume of the type including means for providing a signal responsive to a rib cage dimension indicative of rib cage contribution to respiration volume, means for providing a signal responsive to an abdominal dimension indicative of abdominal contribution to respiration volume, and means for multiplying at least one of said rib cage and abdominal signals by a predetermined weighting factor for reflecting the relative contributions of said rib cage and abdomen to respiration volume, the method comprising non-invasively determining said weighting factor by
(a) totaling the delta values for said rib cage signal over a baseline period of substantially steady state breathing; -
(b) totaling the delta values for said abdominal signal over a baseline period of substantially steady state breathing; (c) dividing the average variability of the mean of the total of said delta values for one of said rib cage or abdominal signals by the average variability of the mean of the total of said delta values for the other of said rib cage or abdominal signals; and (d) multiplying said other signal by a weighting factor equaling the quotient derived from step (c). - View Dependent Claims (5, 6, 7, 8, 9, 10)
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Specification