Fiber Optic Sensors for Soft Tissue Pressure Monitoring

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Solution Overview

Problem

Current technologies for monitoring soft tissue edema and pressure are inadequate, leading to delayed diagnosis and increased healthcare costs due to reliance on user-dependent methods and limited accuracy, particularly in pediatric populations, where complications such as compartment syndrome and Volkmann's contracture can result in severe tissue damage and high indemnity payments.

Innovation Solution

The development of fiber optic sensors embedded in flexible tapes or fabrics that use light to measure pressure and temperature changes in soft tissues, providing a distributed sensing system with improved spatial resolution, cost-effectiveness, and reduced patient discomfort, allowing for real-time monitoring and objective decision-making.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional electronic sensors are used for monitoring soft tissue pressure and temperature, then the monitoring function is provided, but the sensors cause patient discomfort and require electrical current which may not be safe for pediatric patients

Engineering Contradiction:

Improvepatient safetyVSAvoidpatient discomfort

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces electronic sensors with fiber optic sensors that use light instead of electrical current to measure pressure and temperature. This substitution eliminates the discomfort and safety concerns associated with electronic sensors in pediatric patients, as the fiber optic sensors are inert, flexible, and do not require electrical power in the body.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the physical state and properties of the sensor medium from electronic components to optical fibers. The fiber optic sensors utilize the properties of light transmission and scattering in glass fibers to detect physiological parameters, fundamentally changing how measurement is achieved and eliminating the harmful effects of electronic current in patients.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If point sensors are used to monitor soft tissue, then pressure and temperature can be measured at specific locations, but spatial resolution is limited and cannot provide distributed monitoring

Engineering Contradiction:

Improvespatial resolutionVSAvoidsensor distribution

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments the monitoring function along the length of the optical fiber, creating multiple sensing points that can detect pressure and temperature at different locations simultaneously. This segmentation enables distributed monitoring across the soft tissue while maintaining the simplicity of a single fiber optic cable infrastructure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from point measurements to distributed spatial measurements by utilizing the length dimension of the optical fiber as a sensing array. This dimensional extension allows continuous monitoring across a volume of tissue without requiring multiple discrete sensor devices, thereby improving spatial resolution without proportionally increasing system complexity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If cast materials are applied too tightly to control edema, then swelling can be reduced, but tissue ischemia and skin breakdown may occur

Engineering Contradiction:

Improveedema controlVSAvoidtissue ischemia

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent implements real-time feedback monitoring of tissue pressure and temperature under the cast using fiber optic sensors. This continuous feedback allows clinicians to adjust cast tightness dynamically, ensuring adequate edema control while preventing excessive compression that would cause ischemia or skin breakdown. The system enables objective decision-making based on actual tissue conditions rather than anecdotal experience.

Inventive Principle:

Principle #23Feedback

4Ease of operation

If anecdotal experience is used to determine cast tension, then application is simplified, but accuracy is poor with large margin of error

Engineering Contradiction:

Improveapplication simplicityVSAvoidcast tension accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent enables the tissue itself to provide the measurement data through embedded fiber optic sensors that continuously monitor pressure and temperature. This self-monitoring capability eliminates the need for complex external measurement devices and provides accurate, objective data about cast tension directly from the tissue, improving precision without complicating the application process.

Inventive Principle:

Principle #25Self-service

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 solution enables accurate and sensitive monitoring of soft tissue pressure and temperature changes, reducing the risk of tissue ischemia and secondary complications, thereby improving clinical decision-making and reducing healthcare costs and indemnity payments.

Implementation Method 1

The fiber optic sensor is based on measuring stress induced birefringence in an optical fiber, which modulates the transmission of light through the fiber.

Methodology Applied

Scientific EffectPhotoelasticity: Photoelasticity