Filtering of a physiologic signal in a medical device
First Claim
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1. A system for filtering a pressure signal in a medical device, comprising:
- a sensor terminal sensing the pressure signal;
an electrode terminal receiving cardiac electrical signals;
a microprocessor that determines a heart rate based on the received cardiac electrical signals; and
a signal filtering system that digitizes the sensed pressure signal and that filters the digitized pressure signal using a filter having a heart-rate dependent frequency response, wherein the filter comprises;
a first filter portion having a first frequency response corresponding to a heart rate that is greater than a heart rate threshold; and
a second filter portion having a second frequency response different from the first frequency response, the second frequency response corresponding to a heart rate that is less than the heart-rate threshold, andwherein the microprocessor derives a respiration signal based on the filtered pressure signal, and determines a respiration parameter based on the derived respiration signal.
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Abstract
A system and method for filtering a pressure signal in a medical device in which a sensor terminal senses the pressure signal, an electrode terminal receives cardiac electrical signals, a signal filtering system filters the sensed pressure signal in response to a determined heart rate to generate a heart-rate dependent frequency response, and a microprocessor derives a respiration signal in response to the heart rate dependent frequency response, and determines metrics of hemodynamic function in response to the derived respiration signal.
36 Citations
34 Claims
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1. A system for filtering a pressure signal in a medical device, comprising:
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a sensor terminal sensing the pressure signal; an electrode terminal receiving cardiac electrical signals; a microprocessor that determines a heart rate based on the received cardiac electrical signals; and a signal filtering system that digitizes the sensed pressure signal and that filters the digitized pressure signal using a filter having a heart-rate dependent frequency response, wherein the filter comprises; a first filter portion having a first frequency response corresponding to a heart rate that is greater than a heart rate threshold; and a second filter portion having a second frequency response different from the first frequency response, the second frequency response corresponding to a heart rate that is less than the heart-rate threshold, and wherein the microprocessor derives a respiration signal based on the filtered pressure signal, and determines a respiration parameter based on the derived respiration signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 27, 28, 29, 30)
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9. A method for filtering a pressure signal in a medical device system, comprising:
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sensing the pressure signal via a sensor terminal; determining a heart rate; digitizing the sensed pressure signal; filtering the digitized pressure signal using a filter having a heart-rate dependent frequency response, wherein the filtering comprises; filtering the digitized pressure signal using a first filter portion having a first frequency response corresponding to a heart rate that is greater than a heart-rate threshold; and filtering the digitized pressure signal using a second filter portion having a second frequency response different from the first frequency response, the second frequency response corresponding to a heart rate that is less than the heart-rate threshold; and deriving a respiration signal based on the filtered pressure signal; and determining a respiration parameter based on the derived respiration signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A system for filtering a pressure signal in a medical device, comprising:
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means for sensing the pressure signal via a sensor terminal; means for determining a heart rate; means for digitizing the sensed pressure signal; means for filtering the digitized pressure signal using a filter having a heart-rate dependent frequency response, wherein means for filtering comprises; means for filtering the digitized pressure signal using a first filter portion having a first frequency response corresponding to a heart rate that is greater than a heart-rate threshold; and means for filtering the digitized pressure signal using a second filter portion having a second frequency response different from the first frequency response, the second frequency response corresponding to a heart rate that is less than the heart-rate threshold; and means for deriving a respiration signal based on the filtered pressure signal; and means for determining a respiration parameter based on the derived respiration signal. - View Dependent Claims (23, 24, 25, 26, 31, 32, 33, 34)
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Specification