Depth of anesthesia monitor
First Claim
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1. A method for monitoring a level of alertness, comprisinga) sensing an electrically passive oscillating biological parameter;
- b) generating a power-frequency distribution describing a pattern of oscillation of said parameter;
c) quantifying a frequency axis dimension of a peak frequency bandwidth of said power-frequency distribution; and
d) inferring a level of alertness from said quantified frequency axis dimension.
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Abstract
A method and device for determining the depth of anesthesia. A pattern of very low frequency oscillations in measured skin temperature, or photoplethysmographic pulse pressure, is defined and analyzed. The frequency bandwidth of a frequency domain analysis of the oscillatory pattern, or the correlation between simultaneous oscillatory patterns measured at different physical locations, are used separately or fused to obtain an index of depth of anesthesia.
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Citations
24 Claims
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1. A method for monitoring a level of alertness, comprising
a) sensing an electrically passive oscillating biological parameter; -
b) generating a power-frequency distribution describing a pattern of oscillation of said parameter; c) quantifying a frequency axis dimension of a peak frequency bandwidth of said power-frequency distribution; and d) inferring a level of alertness from said quantified frequency axis dimension. - View Dependent Claims (2, 3, 4, 5)
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6. A method for monitoring a level of alertness of a subject, comprising
a) synchronously sensing an oscillating biological parameter at at least two locations on the subject, wherein said locations are paired body parts; -
b) generating at least two signals, each describing a pattern of oscillation of said parameter as sensed at one of said locations; c) calculating a descriptor of concordance between said signals; and d) inferring a level of alertness from said descriptor. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A system for monitoring a level of alertness, comprising
a) a mechanism for sensing an electrically passive oscillating biological parameter; - and
b) a processor operative to generate a power-frequency distribution describing a pattern of oscillation of said parameter, and operative to quantify at least one frequency axis dimension of a peak frequency bandwidth of said power-frequency distribution. - View Dependent Claims (13, 14)
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15. A system for monitoring a level of alertness of a subject, comprising
a) a mechanism for synchronously sensing an oscillating biological parameter at two paired locations on the subject; - and
b) a processor operative to calculate a degree of concordance between oscillatory patterns, as sensed at each of said paired locations, of said parameter. - View Dependent Claims (16, 17)
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18. A method for monitoring a level of alertness, comprising
a) sensing a skin temperature; -
b) generating a signal describing a pattern of oscillation of said sensed skin temperature; c) quantifying at least one frequency domain parameter of said signal; and d) inferring a level of alertness from said at least one frequency domain parameter. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A system for monitoring a level of alertness, comprising
a) a temperature probe for sensing a skin temperature; - and
b) a processor operative to generate a signal describing a pattern of oscillation of said sensed skin temperature, and further operative to quantify at least one frequency domain parameter of said signal.
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Specification