Physiological Monitor Gauge Panel for Motion-Resistant Oximetry
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Solution Overview
Problem
Conventional pulse oximetry systems face errors due to venous blood movement during patient motion, low perfusion, intense light interference, and electrosurgical instrument interference, which are not effectively addressed by existing technologies.
Innovation Solution
A physiological monitor gauge panel with a graphical user interface (GUI) that displays multiple gauges with rotatable needles and alarm regions, allowing caregivers to quickly assess patient status across multiple parameters, including oxygen saturation, total hemoglobin, and methemoglobin, with visual and auditory alerts for alarm conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional pulse oximetry is used to measure oxygen saturation, then the measurement is simple and noninvasive, but the measurement accuracy deteriorates during patient motion due to venous blood movement
Solution Approach 1:
The patent segments the blood flow signal into arterial and venous components by analyzing the pulsatile nature of arterial blood flow. The system separates the arterial pulse waveform from venous blood movement, allowing accurate oxygen saturation measurement of arterial blood even during patient motion. This is achieved through waveform analysis that identifies arterial pulsations distinct from venous flow patterns.
Solution Approach 2:
The patent changes the measurement parameter from simple light absorption to analysis of the pulsatile arterial blood flow waveform. By focusing on the temporal characteristics of arterial pulsations rather than static absorption, the system can distinguish arterial from venous blood and maintain measurement accuracy during motion. The perfusion index parameter is introduced to quantify signal quality and arterial blood flow strength.
2Measurement precision
If advanced pulse oximetry processes venous blood signal to report true arterial oxygen saturation during patient movement, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical or algorithmic separation methods with an optical approach using multiple wavelengths. By measuring light absorption at different wavelengths and analyzing the pulsatile component, the system automatically isolates arterial blood signal without requiring complex venous signal processing algorithms. The optical physics inherently separates arterial from venous contributions through the pulsatile measurement approach.
3Device complexity
If conventional pulse oximetry is used under conditions of low perfusion, then the device remains simple, but the measurement reliability deteriorates due to small signal amplitude
Solution Approach 1:
The patent uses periodic pulsatile light modulation at multiple frequencies to enhance signal detection under low perfusion conditions. By modulating the light source periodically and analyzing the AC component of the photodetector signal, the system can detect small arterial pulsations even when overall perfusion is low. The periodic action allows differentiation of arterial pulsations from DC offset and low-frequency motion artifacts.
4Device complexity
If conventional pulse oximetry is used under intense ambient light conditions, then the device structure remains simple, but measurement accuracy deteriorates due to light interference
Solution Approach 1:
The patent employs periodic modulation of the light source at specific frequencies and detects signals at these same frequencies using synchronous detection. This allows the system to distinguish modulated LED light from unmodulated ambient light interference. By measuring only at the modulation frequency, the system rejects constant or slowly varying ambient light while accurately measuring arterial oxygen saturation.
5Ease of operation
If a graphical user interface with multiple gauges is implemented to enable quick assessment of patient status, then ease of operation improves, but device complexity increases
Solution Approach 1:
The patent uses color-coded alarm regions on the gauge faces to indicate different patient status conditions. Alarm regions are displayed in distinct colors (e.g., red for critical, yellow for warning) that provide immediate visual feedback to caregivers about parameter abnormalities. This color-coding system enables rapid assessment of multiple parameters without requiring detailed numerical analysis, improving ease of operation while using standard display technologies.
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 immediate recognition and assessment of patient status across multiple parameters, providing effective monitoring even under challenging conditions such as patient movement and light interference, with clear visual and auditory alerts for alarm conditions.
Implementation Method 1
A typical pulse oximetry system utilizes an optical sensor attached to a fingertip to measure the relative volume of oxygenated hemoglobin in pulsatile arterial blood
Data Source
AI summary
A physiological monitor gauge panel defines parameters to display on a physiological monitor via corresponding gauges. Gauge faces depict a range of parameter values for each of the parameters. An indicator designates a position on each gauge face corresponding to the current parameter value within the range of parameter values. The indicated position on each of the gauges is at the mid-point of each of the gauge faces when each of the parameters is at a nominal value.