Optical Tissue Imaging for Objective Heart Failure Edema Monitoring
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Solution Overview
Problem
Existing methods for detecting edema, particularly in the context of heart failure, are subjective, costly, and require clinical settings, limiting their applicability and accuracy, especially for home monitoring by untrained individuals.
Innovation Solution
A non-invasive system using a light source, image detector, and processing device to analyze reflected light intensity from tissue, employing tunable filters and multiple imaging modalities to determine edema presence and severity, enabling objective and portable edema detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pitting edema testing is performed by clinicians, then edema detection is achieved, but the method is subjective and requires medical training
Solution Approach 1:
The patent replaces the manual mechanical pitting edema test with an optical imaging system using a smartphone camera and light source to capture and analyze tissue images, eliminating the need for clinician finger pressure and subjective assessment
Solution Approach 2:
The patent introduces an image processing algorithm as an intermediary between the physical edema condition and the measurement result, objectively analyzing tissue characteristics from captured images to determine edema presence and severity
2Reliability
If invasive implantable devices like CardioMEMS are used, then continuous blood pressure monitoring is achieved, but the cost and complexity increase significantly
Solution Approach 1:
The patent replaces invasive mechanical implantable devices with a non-invasive optical imaging system using a smartphone camera and external light source to monitor tissue changes indicative of edema
Solution Approach 2:
The patent creates an optical copy or representation of tissue characteristics through captured images, analyzing visual patterns that correlate with edema rather than directly measuring physiological parameters
3Ease of operation
If alternative non-invasive edema measurements are used, then cost and accessibility are improved, but correlation with classical pitting edema grades is difficult
Solution Approach 1:
The patent incorporates feedback mechanisms where the image processing algorithm compares captured tissue images against established edema grade criteria, continuously refining measurements to maintain correlation with clinical assessments
Solution Approach 2:
The patent transforms the measurement parameters from subjective clinician assessment to objective image-based metrics such as tissue reflectivity, texture, and structural characteristics that correlate with edema severity
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
Provides a low-cost, objective, and user-friendly method for detecting and monitoring edema, suitable for use outside clinical settings, improving patient care and reducing healthcare costs by enabling early intervention.
Implementation Method 1
a light source configured to irradiate a subject's tissue with light; an image detector configured to collect reflected light from the subject's tissue
Data Source
AI summary
Systems and methods of detecting and monitoring edema in a subject are described. The systems and methods include light sources, image detectors, filters, and processors that determine whether a subject has edema and the degree of severity. In some embodiments, the processor fuses data from more than one imaging modality.