Endoscope Processor Oxygen Saturation Table Correction
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Solution Overview
Problem
Existing oxygen saturation calculation methods deviate from true values when observing tissues with different spectral characteristics, as they rely on initial correction imaging that may not account for varying tissue properties during actual observation.
Innovation Solution
A processor device that acquires and processes multiple image signals across specific wavelength ranges to calculate oxygen saturation, monitors specific colorant concentrations, and adjusts the oxygen saturation calculation table based on these concentrations to ensure accurate calculations across varying tissue types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If initial correction imaging is performed before oxygen saturation calculation, then the calculation algorithm can be corrected for spectral characteristics, but the method assumes the same tissue portion is observed and fails when different tissue portions with different spectral characteristics are observed
Solution Approach 1:
The patent implements dynamic monitoring of specific colorant concentrations during the observation period and dynamically adjusts the oxygen saturation calculation table based on these monitored values. This transforms the static correction approach into a dynamic system that adapts to changing tissue conditions, allowing accurate measurements across different tissue portions with varying spectral characteristics.
Solution Approach 2:
The system continuously monitors specific colorant concentrations and uses this feedback information to correct the oxygen saturation calculation table. This feedback mechanism ensures that the calculation algorithm remains accurate even when observing different tissue portions, as the table is adjusted based on real-time monitoring of tissue spectral characteristics.
2Device complexity
If a fixed oxygen saturation calculation table is used based on initial correction, then the calculation process is simple, but the calculated values deviate from true values when tissue spectral characteristics change
Solution Approach 1:
The system performs preliminary monitoring of specific colorant concentrations during the observation period. This preliminary action provides the necessary information to adjust the calculation table before actual oxygen saturation calculations are performed, ensuring accuracy without requiring complex real-time recalibration during measurement.
Solution Approach 2:
The patent changes the parameters of the oxygen saturation calculation table based on monitored specific colorant concentrations. By adjusting the calculation table parameters according to actual tissue conditions, the system maintains measurement accuracy while avoiding the need for entirely new calculation algorithms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables high-accuracy oxygen saturation calculation even when observing tissues with different spectral characteristics, reducing deviations from true values and improving clinical reliability.
Implementation Method 1
acquires a first image signal that corresponds to a first wavelength range having a sensitivity to a specific colorant concentration of a specific colorant other than blood hemoglobin among colorants included in a subject of observation, a second image signal that corresponds to a second wavelength range having a sensitivity to oxygen saturation of blood hemoglobin
Data Source
AI summary
Oxygen saturation is calculated on the basis of a calculation value with reference to an oxygen saturation calculation table TBL. A specific colorant concentration of a specific colorant other than hemoglobin is calculated on the basis of B3 image signals and G1 image signals. Whether or not a first difference D1 between the specific colorant concentration and a reference concentration is in a specific range is monitored. A correction notification related to correction of the oxygen saturation calculation table TBL is performed on the basis of a result of the monitoring of the specific colorant concentration.