Physiological Monitor Light Drive Parameter Limit Control
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Solution Overview
Problem
Current physiological monitoring systems, such as pulse oximeters, face challenges in efficiently managing power consumption while maintaining accurate signal quality, particularly in varying physiological conditions.
Innovation Solution
The system determines a light drive parameter limit based on received signals, adjusting the maximum current limit to optimize power usage by combining decisions on physiological parameters like pulse rate and blood oxygen saturation, using a state machine to regulate the light drive parameter, and updating the light drive signal accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light drive parameter is increased to improve signal strength and measurement precision, then the power consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of the light drive parameter limit based on real-time signal quality assessment. The system continuously monitors physiological parameters and signal characteristics, and adaptively modifies the maximum light drive parameter to match current measurement needs, transitioning from static to dynamic control to resolve the contradiction between signal quality and power consumption
Solution Approach 2:
The system changes the light drive parameter limit according to assessed signal quality and physiological conditions. When signal quality is sufficient, the limit is reduced to conserve power; when signal quality deteriorates, the limit is increased to maintain measurement accuracy, thereby dynamically optimizing the trade-off between power consumption and measurement precision
2Use of energy by moving object
If the light drive parameter is dynamically adjusted to reduce power consumption, then the reliability of physiological parameter determination may be compromised
Solution Approach 1:
The patent employs feedback mechanisms where the system continuously monitors signal quality metrics and physiological parameter stability. This feedback information is used to assess whether the current light drive parameter limit is appropriate, ensuring that power consumption is reduced only when measurement reliability is maintained, thus preventing compromise of physiological parameter determination
Solution Approach 2:
The system performs preliminary assessment of signal quality and physiological conditions before adjusting the light drive parameter limit. By evaluating multiple parameters in advance and using logical operations to determine optimal settings, the system ensures that power reduction actions do not compromise measurement reliability, as the adjustment is based on pre-validated conditions
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
This approach reduces power consumption while ensuring reliable determination of physiological parameters, increasing signal strength when needed and conserving power during stable conditions.
Implementation Method 1
generating, using processing equipment, a light drive signal in accordance with a maximum current limit, where the light drive signal is configured to produce an emitted light in the medical sensor
Implementation Method 2
An attenuated light signal corresponding to the generated light signal may be received and may be used to determine a physiological parameter of the subject
Data Source
AI summary
A physiological monitoring system may receive a sensor signal from a physiological sensor. The system may determine a parameter based on the sensor signal, for example variability of a blood oxygen saturation value or the percent modulation of a light signal. The system may determine a light drive parameter limit based on one or more parameters. For example, the system may determine a light drive current limit. The frequency of changes in the limit may be regulated using a state machine and other techniques that include hysteresis. An extant light drive parameter may be updated or changed in accordance with the light drive parameter limit and a light drive signal may be generated based on the light drive parameter.