Adjusting parameters used in pulse oximetry analysis
First Claim
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1. A method for calculating a physiological parameter, comprising:
- receiving, via a processor, a signal representing a plurality of pulses, the signal generated in response to detecting light scattered from blood perfused tissue, each pulse having an amplitude and a period, a subset of the plurality of pulses having a plurality of amplitudes and a plurality of periods;
determining, via the processor, an average amplitude from the plurality of amplitudes;
determining, via the processor, an average period from the plurality of periods;
adjusting, via the processor, an amplitude criterion based on the average amplitude and a period criterion based on the average period;
evaluating, via the processor, one or more of the plurality of pulses to determine one or more qualified pulses by disqualifying a pulse having an amplitude that is smaller than the amplitude criterion and a period that is greater that the period criterion;
ensemble averaging, via an ensemble averaging filter, the one or more qualified pulses;
calculating, via the processor, a physiological parameter based at least in part upon one or more ensemble averaged pulses; and
outputting, via the processor, the physiological parameter for display.
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Abstract
Adjusting a pulse qualification criterion includes receiving a signal representing a plurality of pulses, where the signal is generated in response to detecting light scattered from blood perfused tissue. A characteristic is determined. A pulse qualification criterion used for qualifying a pulse is adjusted in accordance with the characteristic. The pulses are evaluated according to the pulse qualification criterion.
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Citations
15 Claims
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1. A method for calculating a physiological parameter, comprising:
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receiving, via a processor, a signal representing a plurality of pulses, the signal generated in response to detecting light scattered from blood perfused tissue, each pulse having an amplitude and a period, a subset of the plurality of pulses having a plurality of amplitudes and a plurality of periods; determining, via the processor, an average amplitude from the plurality of amplitudes; determining, via the processor, an average period from the plurality of periods; adjusting, via the processor, an amplitude criterion based on the average amplitude and a period criterion based on the average period; evaluating, via the processor, one or more of the plurality of pulses to determine one or more qualified pulses by disqualifying a pulse having an amplitude that is smaller than the amplitude criterion and a period that is greater that the period criterion; ensemble averaging, via an ensemble averaging filter, the one or more qualified pulses; calculating, via the processor, a physiological parameter based at least in part upon one or more ensemble averaged pulses; and outputting, via the processor, the physiological parameter for display. - View Dependent Claims (2, 3, 4)
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5. A system configured to calculate a physiological parameter, comprising:
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an interface configured to; receive a signal representing a plurality of pulses, the signal generated in response to detecting light scattered from blood perfused tissue, each pulse having an amplitude and a period, a subset of the plurality of pulses having a plurality of amplitudes and a plurality of periods; an ensemble averaging filter configured to filter the signal; a processor configured to; determine an average amplitude from the plurality of amplitudes; determine an average period from the plurality of periods; adjust an amplitude criterion based on the average amplitude and a period criterion based on the average period; and evaluate one or more of the plurality of pulses to determine one or more qualified pulses by disqualifying a pulse having an amplitude that is smaller than the amplitude criterion and a period that is greater that the period criterion; wherein the ensemble averaging filter is configured to ensemble average the one or more qualified pulses, and the processor is configured to calculate a physiological parameter based at least in part upon one or more ensemble averaged pulses and output the physiological parameter for display. - View Dependent Claims (6, 7, 8, 9)
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10. A system for calculating a physiological parameter, comprising:
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means for receiving a signal representing a plurality of pulses, the signal generated in response to detecting light scattered from blood perfused tissue, each pulse having an amplitude and a period, a subset of the plurality of pulses having a plurality of amplitudes and a plurality of periods; means for determining an average amplitude from the plurality of amplitudes; means for determining an average period from the plurality of periods; means for adjusting an amplitude criterion based on the average amplitude and a period criterion based on the average period; and means for evaluating one or more of the plurality of pulses to determine one or more qualified pulses by disqualifying a pulse having an amplitude that is smaller than the amplitude criterion and a period that is greater that the period criterion; means for ensemble averaging the one or more qualified pulses; means for calculating a physiological parameter based on one or more ensemble averaged pulses; and means for outputting the physiological parameter for display. - View Dependent Claims (11, 12)
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13. An system configured to calculate a physiological parameter, comprising:
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an interface configured to; receive a signal representing a plurality of pulses, the signal generated in response to detecting light scattered from blood perfused tissue, each pulse having an amplitude and a period, a subset of the plurality of pulses having a plurality of amplitudes and a plurality of periods; an ensemble averaging filter configured to filter the signal; a processor configured to; determine an average amplitude from the plurality of amplitudes; determine an average period from the plurality of periods; adjust an amplitude criterion based on the average amplitude and a period criterion based on the average period; and evaluate one or more of the plurality of pulses to determine one or more qualified pulses by; disqualifying a pulse having an amplitude that is more than three times smaller than the amplitude criterion and a period that is greater that the period criterion; wherein the ensemble averaging filter is configured to ensemble average the one or more qualified pulses, and the processor is configured to calculate a physiological parameter based at least in part on one or more ensemble averaged pulses and to output the physiological parameter for display. - View Dependent Claims (14, 15)
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Specification