Arterial Stiffness Decomposition Using Tonometry Without Vessel Imaging
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Solution Overview
Problem
Existing methods for measuring arterial stiffness require skilled sonographers and expensive imaging equipment, making it difficult to accurately decompose stiffness into structural and load-dependent components for improved disease diagnosis and treatment.
Innovation Solution
An apparatus using arterial tonometry to measure pulse wave velocity and blood pressure, employing a nonlinear model to separate structural and load-dependent stiffness without direct arterial dimension measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ultrasonic imaging is used to measure arterial dimensions, then measurement precision of arterial stiffness is improved, but device complexity and operational difficulty increase due to requiring skilled sonographers and expensive imaging equipment
Solution Approach 1:
The invention extracts the essential measurement function from complex imaging systems. Instead of using full ultrasonic imaging equipment to measure arterial dimensions, the patent extracts only the necessary pressure and pulse wave velocity data through arterial tonometry, eliminating the need for expensive imaging equipment and skilled sonographers while maintaining the ability to calculate arterial stiffness parameters.
Solution Approach 2:
The invention replaces the mechanical/optical imaging system with a pressure-based measurement system. Arterial tonometry uses pressure sensors to detect pulse waves and calculate stiffness, substituting the complex ultrasonic imaging mechanism with a simpler pressure measurement approach that still provides accurate arterial stiffness assessment through mathematical modeling.
2Loss of information
If arterial dimension measurement is performed in real-time, then structural and load-dependent stiffness decomposition is improved, but ease of operation deteriorates due to requiring skilled sonographers to obtain clear images at specific cardiac phases
Solution Approach 1:
The measurement system performs self-calibration and automatic calculation without requiring skilled operator intervention. The arterial tonometry device automatically captures pressure waveforms, calculates pulse wave velocity, and decomposes stiffness into structural and load-dependent components through integrated mathematical models, eliminating the need for skilled sonographers to manually obtain and analyze images at specific cardiac phases.
Solution Approach 2:
The invention changes the measurement parameters from direct arterial dimension measurement to pressure and pulse wave velocity measurement. By measuring pressure variations and wave propagation characteristics instead of physical dimensions, the system achieves stiffness decomposition without requiring real-time imaging at specific cardiac phases, greatly simplifying operation while preserving the ability to separate stiffness components.
3Measurement precision
If expensive imaging equipment such as MRI or CT is used, then measurement precision of arterial stiffness is improved, but loss of substance increases due to eliminating the need for skilled sonographers and reducing operational costs
Solution Approach 1:
The invention uses inexpensive, disposable-like measurement approaches instead of expensive, reusable imaging equipment. Arterial tonometry employs simple pressure sensors and mathematical models that are far cheaper than MRI or CT scanners, providing comparable precision for arterial stiffness measurement while dramatically reducing equipment costs and operational expenses.
Solution Approach 2:
The invention changes the measurement approach from expensive imaging-based dimension measurement to affordable pressure-based indirect measurement. By measuring pressure waveforms and calculating stiffness parameters through mathematical models rather than direct imaging, the system achieves accurate arterial stiffness assessment at a fraction of the cost of MRI or CT equipment.
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
Enables accurate determination of structural and load-dependent stiffness, providing additional clinical insights for cardiovascular and kidney diseases without the need for skilled imaging, reducing costs and complexity.
Implementation Method 1
employing a pressure monitor providing a measure of arterial blood pressure
Implementation Method 2
an arterial pulse wave velocity monitor providing a measure of total arterial stiffness
Implementation Method 3
fits the collected arterial stiffness values and arterial blood pressures to a nonlinear model of arterial elasticity
Data Source
AI summary
A load-dependent component and a structural component of arterial wall stiffness are determined without the need to make measurements of vessel dimensions, for example, using pulse wave velocities, allowing these two components of stiffness to be determined without a skilled sonographer and offering improved treatment and diagnosis of diseases including cardiovascular disease and chronic kidney disease.