Perfusion index smoother
View Patent ↗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.
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;
wherein the final indication of perfusion index is determined by selecting the lowest indication of perfusion index.
2. A method of determining an indication of perfusion index, the method comprising:
receiving pleth data; and
determining an indication of perfusion index by utilizing at least one of a first calculation technique and a second calculation technique to determine a resulting indication of perfusion index;
wherein determining the indication of perfusion index comprises choosing the calculation technique that will result in the lowest perfusion index value.
3. An oximeter comprising:
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 at least one of the first and second calculators to determine a resulting indication of perfusion index,
wherein the processor is configured to select the calculator which calculates the lowest indication of perfusion index.
4. The method of claim 3 , wherein the processor utilizes both calculation techniques.