Flexible Ear Sensor with Strain Relief and Segmented Design
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Solution Overview
Problem
Conventional medical sensors, particularly pulse oximetry sensors, face inaccuracies when applied to the ear due to poor fit and strain from cables, leading to ambient light interference and dislodgment, which are not adequately addressed by existing designs that are either too bulky or specifically calibrated for the finger.
Innovation Solution
Disposable medical sensors with moldable components and strain relief features, such as movable clips and deformable putties, are designed to conform to the ear anatomy, providing secure attachment and reducing strain on electrical components, while also preventing ambient light from affecting measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pulse oximetry sensors are applied to the ear, then physiological parameters can be monitored, but measurement accuracy deteriorates due to poor fit and ambient light interference
Solution Approach 1:
The sensor is divided into multiple functional segments: a flexible bandage portion for conforming to the ear, a separate sensor module containing optical components, and attachment features. This segmentation allows each part to be optimized independently - the bandage provides secure fit while the sensor module maintains precise optical alignment, resolving the contradiction between fit stability and measurement accuracy.
Solution Approach 2:
Different regions of the sensor have specialized properties: the bandage area is soft and flexible for conforming to ear anatomy, the sensor housing is rigid for maintaining optical component alignment, and specific zones have adhesive or friction-based attachment features. This local differentiation enables the sensor to simultaneously achieve secure fit and accurate measurements by optimizing each region for its specific function.
2Measurement precision
If sensors are designed for specific anatomy (e.g., finger), then measurement accuracy is improved for that site, but adaptability to other sites (e.g., ear) deteriorates
Solution Approach 1:
The sensor design incorporates a universal flexible bandage base that can conform to various anatomical sites including ear, finger, or other body parts. The sensor module is designed to maintain proper optical alignment regardless of the underlying anatomy, allowing the same sensor design to achieve accurate measurements across multiple anatomical locations through its adaptable attachment mechanism.
Solution Approach 2:
The sensor employs dynamic attachment features that can adapt to different anatomical contours - the flexible bandage portion deforms to match the ear's shape, while friction-based or adjustable attachment mechanisms allow the sensor to secure itself at various positions. This dynamic adaptability enables the sensor to maintain measurement accuracy across different anatomical sites without requiring site-specific redesign.
3Reliability
If sensors are made secure to prevent dislodgment, then reliability is improved, but strain on electrical components increases leading to potential damage
Solution Approach 1:
The sensor design extracts and isolates the electrical components and cable connections from the attachment interface. The flexible bandage and attachment features are separated from the electronic circuitry, allowing the attachment mechanism to provide secure fixation without transmitting mechanical strain to the electrical components. This separation protects the electronics while maintaining reliable attachment.
Solution Approach 2:
The flexible bandage material acts as an intermediary between the attachment interface and the electrical components. It absorbs and distributes mechanical stresses, preventing direct transmission of strain forces to the sensitive electrical circuits. This intermediary layer enables secure attachment while protecting the electrical components from damage.
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
These sensors ensure accurate and comfortable physiological parameter measurements by providing a secure fit and minimizing strain, thus improving measurement reliability and patient comfort.
Implementation Method 1
Pulse oximetry sensors, as well as other types of non-invasive optical sensors, transmit light through a patient's tissue and photoelectrically detect the absorption and/or scattering of the transmitted light in such tissue
Data Source
AI summary
The present disclosure relates to sensors for use on a patient's ear. The sensors as provided may be disposable and configured to be retained on an ear with a biasing mechanism. In particular embodiments, the biasing mechanism is a sliding clip that is configured to bias a first portion and a second portion of a sensor body towards one another.