Dual-Mode Pulse Oximeter Sensor Switching
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Solution Overview
Problem
Pulse oximetry sensors face challenges in maintaining signal quality due to patient movement and anatomical variations, leading to signal artifacts and the need for complex signal processing to mitigate these issues.
Innovation Solution
Dual-mode sensors capable of operating in both transmission and reflectance modes, which can switch between modes to improve signal quality by adjusting the placement of emitters and detectors, thereby reducing the impact of movement and anatomical changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the sensor is fitted snugly against the patient's tissue to avoid outside light infiltration, then light blocking performance is improved, but the sensor becomes difficult to adjust to different patient physiologies and may cause discomfort
Solution Approach 1:
The sensor incorporates flexible elements that allow it to dynamically adapt its shape and conformation to match different patient anatomies while maintaining adequate contact for optical measurement. This flexibility enables the sensor to accommodate various patient physiologies without requiring manual adjustment or causing discomfort.
2Adaptability or versatility
If the sensor is made flexible to accommodate patient movement, then adaptability is improved, but the optical components may lose contact with the skin causing signal artifacts
Solution Approach 1:
The sensor design incorporates different mechanical properties in different regions: flexible elements in areas subject to movement to accommodate patient motion, while rigid or stabilized regions maintain consistent optical contact with the skin. This localized differentiation allows the sensor to simultaneously adapt to patient movement and maintain reliable optical measurement.
3Reliability
If complex signal processing is used to mitigate artifacts from sensor movement, then measurement reliability is improved, but device complexity increases
Solution Approach 1:
The sensor incorporates mechanical features that proactively prevent or minimize signal artifacts before they occur, such as flexible elements that maintain constant optical contact during patient movement. By preventing artifacts at the source rather than correcting them through complex signal processing, the system achieves reliable measurements with simpler processing requirements.
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
Enhances signal quality by automatically switching between modes to minimize artifacts, allowing for more reliable measurement of physiological parameters like blood oxygen saturation, even in situations where traditional sensors may fail.
Implementation Method 1
an LED and a photodetector positioned to receive the light that passes through the tissue
Implementation Method 2
photoelectrically detects the absorption and/or scattering of the transmitted light in such tissue
Implementation Method 3
photoelectrically detects the absorption and/or scattering of the transmitted light in such tissue
Implementation Method 4
Reflectance and/or transmissive pulse oximeter
Data Source
AI summary
According to various embodiments, a medical sensor assembly may be configured to switch between transmission and reflectance mode. Such sensors may include multiple optical sensing components that may be activated or silent, depending on the mode in use. A practitioner may switch between modes based on the particular situation of the patient or based on the signal quality.