Respiration measurement by means of morphological operators
First Claim
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1. A heart monitor configured to obtain respiration metrics comprising:
- an impedance signal input;
an impedance measurement unit coupled with said impedance signal input;
a microprocessor configured to obtain a first time series of values that represent a transthoracic impedance signal obtained from said impedance measurement unit; and
,said microprocessor further configured togenerate a modified time series of values that represent a trend of values of said first time series through application of at least one morphological operator comprisingan erosion operator ora dilation operator orany combination thereofwherein said trend of values comprises a respiratory component of said first times series, andwherein said at least one morphological operator includes said erosion operator defined by
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Abstract
An implantable medical device that measures respiration parameters based on transthoracic impedance signals, and converts transthoracic impedance signals into a time series of digital values which is filtered with morphological operators to separate the signal into a respiratory component and a cardiac component. Metrics are generated based on the filtered impedance values such as respiratory rate, I/E ratio, tidal volume and minute ventilation.
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Citations
18 Claims
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1. A heart monitor configured to obtain respiration metrics comprising:
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an impedance signal input; an impedance measurement unit coupled with said impedance signal input; a microprocessor configured to obtain a first time series of values that represent a transthoracic impedance signal obtained from said impedance measurement unit; and
,said microprocessor further configured to generate a modified time series of values that represent a trend of values of said first time series through application of at least one morphological operator comprising an erosion operator or a dilation operator or any combination thereof wherein said trend of values comprises a respiratory component of said first times series, and wherein said at least one morphological operator includes said erosion operator defined by - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A heart monitor configured to obtain respiration metrics comprising:
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an impedance signal input; an impedance measurement unit coupled with said impedance signal input; a microprocessor configured to obtain a first time series of values that represent a transthoracic impedance signal obtained from said impedance measurement unit; said microprocessor further configured to generate a modified time series of values that represent a trend of values of said first time series through application of at least one morphological operator wherein said trend of values comprises a respiratory component of said first times series; wherein said at least one morphological operator includes an erosion operator defined by - View Dependent Claims (17)
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18. A heart monitor configured to obtain respiration metrics comprising:
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an impedance signal input; an impedance measurement unit coupled with said impedance signal input; a microprocessor configured to obtain a first time series of values that represent a transthoracic impedance signal obtained from said impedance measurement unit; and
,said microprocessor further configured to generate a modified time series of values that represent a trend of values of said first time series through application of at least one morphological operator comprising an erosion operator or a dilation operator or any combination thereof wherein said trend of values comprises a respiratory component of said first times series; wherein said trend of values comprises a respiratory component that is measured from a nadir to a following peak to determine inspiration time (TI), and from a peak to following nadir to determine expiration time (TE); wherein said trend of values is calculated to disregard under-threshold moves, and over-threshold moves in a direction opposite to a current up or down trend of values, such that if a current value of a point in time n is less than, or greater than, a current value at a previous point in time n−
1, and less than, or greater than, a current value at a later in point in time n+1, then the value at point in time n is disregarded as neither a peak or a nadir.
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Specification