Methods and apparatus for producing and using lightly filtered photoplethysmograph signals
First Claim
1. Apparatus for monitoring a physiological condition of a patient comprising:
- photoplethysmograph (“
PPG”
) circuitry configured to obtain a PPG signal from the patient;
filter circuitry configured to lightly filter the PPG signal to produce a lightly filtered PPG signal; and
output circuitry configured to provide a visible display of a trace of the lightly filtered PPG signal, thereby making it possible for a clinician user of the apparatus to observe at least some patient physiological condition information contained in the lightly filtered PPG signal.
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Accused Products
Abstract
One or more physiological conditions of a patient can be observed by obtaining a photoplethysmograph (“PPG”) signal from the patient and by only lightly filtering that signal. The light filtering of the PPG may be such as to only remove (for example) high frequency noise from that signal, while leaving in the signal most or all frequency components that are due to physiological events in the patient. In this way, such physiological events can be observed via a visual display of the lightly filtered PPG signal and/or via other signal processing of the lightly filtered PPG signal to automatically extract certain physiological parameters or characteristics from that signal.
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Citations
22 Claims
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1. Apparatus for monitoring a physiological condition of a patient comprising:
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photoplethysmograph (“
PPG”
) circuitry configured to obtain a PPG signal from the patient;filter circuitry configured to lightly filter the PPG signal to produce a lightly filtered PPG signal; and output circuitry configured to provide a visible display of a trace of the lightly filtered PPG signal, thereby making it possible for a clinician user of the apparatus to observe at least some patient physiological condition information contained in the lightly filtered PPG signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of monitoring a physiological condition of a patient comprising:
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obtaining a photoplethysmograph (“
PPG”
) signal from the patient;lightly filtering the PPG signal to produce a lightly filtered PPG signal; and visibly displaying a trace of the lightly filtered PPG signal so that a clinician user of the method can observe at least some patient physiological condition information that is contained in the lightly filtered PPG signal. - View Dependent Claims (22)
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Specification