Perfusion index smoother
DC CAFCFirst Claim
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1. A method of determining an indication of perfusion index in a patient monitor, the method comprising:
- receiving pleth data;
calculating at least two indications of perfusion index using at least two different calculation techniques; and
determining a final indication of perfusion index based on the at least two indications of perfusion index, the final indication determined based on the signal quality, the lowest determined value of the at least two indications of perfusion index, an average of the at least two indications of perfusion index and a statistically analysis of the at least two indications of perfusion index.
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Abstract
An embodiment of the present disclosure seeks to smooth a perfusion index measurement through use of a baseline perfusion index measurement and/or through the use of multiple PI calculations. The combination of the baseline perfusion index measurement reduces an error between a calculated measurement of PI and actual conditions.
974 Citations
6 Claims
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1. A method of determining an indication of perfusion index in a patient monitor, the method comprising:
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receiving pleth data; calculating at least two indications of perfusion index using at least two different calculation techniques; and determining a final indication of perfusion index based on the at least two indications of perfusion index, the final indication determined based on the signal quality, the lowest determined value of the at least two indications of perfusion index, an average of the at least two indications of perfusion index and a statistically analysis of the at least two indications of perfusion index.
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2. An oximeter comprising:
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an input capable of receiving intensity signal data responsive to intensity signals acquired from a detector capable of detecting light attenuated by body tissue, a first calculation calculator configured to calculate a first indication of perfusion index using a first calculation technique; a second calculator configured to calculate a second indication of perfusion index using a second calculation technique; and a processor configured to utilize the first and second calculators to determine a resulting indication of perfusion index, the resulting indication of perfusion determined based on a signal quality indication and values of the first and second indications;
wherein the processor is configured to determine the resulting indication by using the signal quality indication to determine whether to select a lowest value of the first or second indication, averaging the first and second indications, and statistically analyzing the first and second indications. - View Dependent Claims (3)
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4. A method of determining an indication of a physiological condition using data responsive to intensity signals acquired from a detector capable of detecting light attenuated by body tissue, the method comprising:
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determining one or more indications of pulse information from data responsive to intensity signals acquired from a detector capable of detecting light attenuated by body tissue; determining a first indication of amplitude data for a pulse based on the one or more indications of pulse information; determining a second indication of amplitude data for a combination of pulses based on the one or more indications of pulse information; determining a final indication of amplitude data based on the first and second indications, wherein the determining a final indication comprises using, based on a signal quality indication, the amplitude data, selecting a lowest indication of amplitude from the first and second indications, averaging the first and second indications of amplitude, using a statistical analysis of the first and second indications of amplitude, and a statistical analysis of the first and second indications of amplitude; and outputting the final indication as an indication of perfusion index. - View Dependent Claims (5, 6)
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Specification