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 performed on a processor of smoothing a perfusion index measurement displayed in an oximeter system, the method comprising:
establishing a baseline perfusion index during quality signal conditions of a signal responsive to intensity signals acquired from a detector capable of detecting light attenuated by body tissue, and
displaying a single value of perfusion index, the single value being the baseline perfusion index if a current signal includes motion-induced noise and a current PI derived from the current signal is not lower than the baseline PI, otherwise the single value being the current perfusion index.
2. The method of claim 1 , comprising triggering an alarm configured to alert a caregiver when said signal meets predetermined criteria.
3. The method of claim 1 , wherein establishing a baseline perfusion index comprises a calculation utilizing a plurality of perfusion indices.
4. The method of claim 1 , wherein the signal is responsive to an IR intensity signal.
5. 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 memory storing a baseline Perfusion Index (PI); and
a processor programmed to display a single value of PI, said single value being said baseline PI if a current signal data includes motion-induced noise and a current PI derived from said current signal data is not lower than said baseline PI, otherwise said single value being said current PI.
6. The oximeter of claim 5 , comprising an alarm configured to alert a caregiver when said signal data meets predetermined criteria.