Modular Physiological Sensor Layout for Shared Measurement Sites
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Solution Overview
Problem
Conventional pulse oximetry systems fail to accurately measure oxygen saturation during patient motion, low perfusion, intense ambient light, and electrosurgical instrument interference, and multiple physiological sensors interfere with each other when used in the same measurement site, compromising patient comfort and monitoring accuracy.
Innovation Solution
Modular physiological sensors are designed with specific configurations that allow multiple sensors to share a measurement site without interference, featuring overlapping attachment areas, release liners, and mechanical features for precise placement, and integrated signal processing to ensure accurate and comfortable simultaneous monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple physiological sensors are used in the same measurement site, then comprehensive physiological monitoring is achieved, but sensor interference occurs and patient comfort deteriorates
Solution Approach 1:
The sensor system is divided into modular components with distinct functional regions. The pulse oximetry sensor and EEG sensor are segmented into separate modules that can be independently positioned and attached to different areas of the forehead, eliminating signal interference while maintaining comprehensive monitoring capability.
Solution Approach 2:
The sensors are arranged in a three-dimensional spatial configuration on the forehead rather than overlapping in the same plane. The pulse oximetry sensor is positioned centrally while EEG electrodes are distributed around the periphery, utilizing vertical and radial dimensions to separate measurement zones and prevent interference.
2Measurement precision
If conventional pulse oximetry is used during patient motion, then oxygen saturation measurement is obtained, but measurement accuracy deteriorates due to venous blood movement
Solution Approach 1:
The pulse oximetry system incorporates motion detection algorithms that continuously monitor signal characteristics and automatically adjust measurement parameters when motion is detected. The system provides real-time feedback to distinguish arterial from venous blood flow patterns, maintaining accurate SpO2 measurements during patient movement.
Solution Approach 2:
The system dynamically changes measurement parameters such as pulse width modulation duty cycle and integration time based on detected perfusion levels and motion states. During low perfusion or motion conditions, the system adjusts LED drive current and sampling frequency to optimize signal-to-noise ratio and maintain measurement accuracy.
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
The modular design ensures accurate and comfortable simultaneous monitoring of multiple physiological parameters, such as EEG and regional oximetry, by minimizing sensor interference and enhancing patient comfort and monitoring efficiency.
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
Implementation Method 2
Oxygen saturation (SpO2), pulse rate and a plethysmograph waveform, which is a visualization of pulsatile blood flow over time, are displayed on a monitor accordingly
Data Source
AI summary
Modular physiological sensors that are physically and/or electrically configured to share a measurement site for the comfort of the patient and/or to ensure proper operation of the sensors without interference from the other sensors. The modular aspect is realized by providing outer housing shapes that generally conform to other physiological sensors; mounting areas for attachment of one sensor to another sensor; providing release liners on the overlapping sensor attachment areas; and/or providing notches, tabs or other mechanical features that provide for the proper placement and interaction of the sensors.