Oximetry Sensor Simultaneous Pulse and Regional Blood Oxygen Saturation
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Solution Overview
Problem
Current pulse oximeters and regional oximeters typically require different pre-processing techniques for PPG signals, which limits their ability to simultaneously calculate pulse and regional blood oxygen saturation effectively using a single sensor.
Innovation Solution
A system with two emitters and two detectors is used to emit light signals at multiple wavelengths, allowing for simultaneous calculation of pulse and regional blood oxygen saturation by applying different pre-processing techniques to the received light signals, enabling the use of a 'ratio-of-ratios' technique for pulse and a light intensity differencing technique for regional saturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If different pre-processing techniques are applied for pulse and regional oximetry, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the signal processing into separate processing paths for pulse oximetry and regional oximetry. Each path applies its own optimized pre-processing technique (ratio-of-ratios for pulse, light intensity differencing for regional), allowing each measurement type to be processed independently with its own specialized algorithm, thus maintaining high precision without requiring a single complex unified system
Solution Approach 2:
The system uses a single sensor with multiple emitters and detectors that serves dual purposes: measuring both pulse blood oxygen saturation and regional blood oxygen saturation simultaneously. The same hardware platform performs multiple measurement functions by applying different processing techniques to the collected light signals
2Productivity
If simultaneous calculation of pulse and regional blood oxygen saturation is implemented, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent combines pulse oximetry and regional oximetry measurements into a single simultaneous operation using one sensor assembly. The multiple emitters and detectors collect light signals that contain information about both pulse and regional oxygen saturation, which are then calculated concurrently through separate but parallel processing paths, improving efficiency while sharing hardware resources
3Measurement precision
If multiple wavelengths of light are emitted, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The system emits light at multiple wavelengths in a periodic, time-multiplexed manner rather than continuously at all wavelengths simultaneously. The emitters are activated sequentially or in alternating patterns, allowing the detectors to collect signals from different wavelengths at different times, which maintains the ability to distinguish between oxyhemoglobin and deoxyhemoglobin while significantly reducing the total energy consumption compared to continuous multi-wavelength emission
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 the simultaneous calculation of pulse and regional blood oxygen saturation values, improving the accuracy and efficiency of blood oxygen saturation measurements in both arterial and venous systems.
Implementation Method 1
a sensor including two emitters and two detectors may be used to simultaneously calculate the pulse blood oxygen saturation and the regional blood oxygen saturation
Implementation Method 2
Pulse blood oxygen saturation may be calculated based on the intensities of two wavelengths of light signals (e.g., RED and IR light emitted and received) at different points in a pulse cycle
Data Source
AI summary
Methods and systems are provided that allow for the simultaneous calculation of pulse and regional blood oxygen saturation. An oximeter system that includes a sensor with a plurality of emitters and detectors may be used to calculate a pulse and/or regional blood oxygen saturation. A plurality of light signals may be emitted from light emitters. A first light signal may be received at a first light detector and a second light signal may be received at a second light detector. A pulse and/or regional blood oxygen saturation value may be calculated based on the received first and/or second light signals. The pulse and regional blood oxygen saturation values may be calculated substantially simultaneously. The calculated pulse and regional blood oxygen saturation values as well as other blood oxygen saturation values may be displayed simultaneously in a preconfigured portion of a display.