Noninvasive Optical CVP Measurement via Venous Volume
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Solution Overview
Problem
Current methods for determining central venous pressure (CVP) are invasive, impractical for ambulatory patients, or expensive, and lack sensitivity for early detection of hemodynamic congestion in heart failure patients, leading to inadequate management of fluid overload and increased hospital admissions.
Innovation Solution
A noninvasive, self-administered system using optical measurements of venous volume and anatomical data to determine CVP through alterations in transmural pressure, allowing for absolute measurements or monitoring of relative changes over time, correlated with cardiovascular function to manage heart failure proactively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive catheter insertion is used for CVP measurement, then measurement accuracy is improved, but patient safety and ease of operation deteriorate due to potential complications and complexity
Solution Approach 1:
The patent replaces the mechanical invasive catheter insertion system with an optical measurement system that uses light transmission through the skin to detect venous pressure changes. The optical sensor system measures jugular venous pressure noninvasively, eliminating the need for catheter insertion while maintaining measurement capability through optical detection of pressure-induced vascular changes.
Solution Approach 2:
The patent introduces an intermediary optical sensor system that detects CVP indirectly through measurements of jugular vein pressure and vascular volume changes. Instead of directly measuring right atrial pressure via catheter, the system uses the jugular vein as an intermediary indicator that reflects central venous pressure changes, enabling noninvasive measurement through optical detection of the intermediary vascular structure.
2Object-affected harmful factors
If physical examination of jugular veins is used for CVP estimation, then noninvasive measurement is achieved, but measurement precision deteriorates due to difficulty and variability in clinical assessment
Solution Approach 1:
The patent replaces the manual mechanical clinical examination method with an automated optical measurement system. Instead of relying on visual and tactile assessment by clinicians, the system uses optical sensors to objectively measure jugular venous pressure and vascular volume, providing precise, reproducible, and quantifiable CVP estimates without the variability inherent in physical examination techniques.
Solution Approach 2:
The patent enables self-service measurement by allowing patients to perform CVP monitoring independently using the optical device. The system includes automated optical detection, processing, and display capabilities that patients can operate without clinical expertise, transforming the previously clinician-dependent measurement process into a self-administered home monitoring tool.
3Measurement precision
If invasive CVP monitoring systems are used, then hemodynamic monitoring accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the essential measurement function from complex invasive monitoring systems by isolating the core capability to detect pressure changes through optical means. The system removes unnecessary invasive components, catheters, and complex mechanical linkages, retaining only the essential optical sensor and processing elements needed for accurate CVP measurement, thereby simplifying the overall system architecture.
Solution Approach 2:
The patent substitutes complex mechanical and electronic invasive monitoring systems with a simplified optical measurement system. By using optical detection of vascular volume and pressure changes, the system achieves hemodynamic monitoring accuracy without requiring complex mechanical catheter systems, pressure transducers, or invasive electronic sensing networks, thereby reducing device complexity and cost.
4Reliability
If current CVP measurement methods are used, then diagnostic capability is maintained, but sensitivity for early detection of hemodynamic congestion deteriorates
Solution Approach 1:
The patent employs periodic optical measurements taken at multiple time points during respiratory cycles and over time to detect subtle changes in venous volume and pressure. By analyzing periodic variations and temporal trends in the optical signals, the system enhances sensitivity for early detection of hemodynamic congestion, identifying trends before they become clinically apparent through static single-point measurements.
Solution Approach 2:
The patent incorporates feedback mechanisms that continuously monitor optical signal changes and compare them against reference values and temporal patterns. The system provides real-time feedback about CVP status and detects early deviations from normal patterns, enabling sensitive detection of developing hemodynamic congestion and allowing for proactive clinical intervention before severe congestion occurs.
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 accurate, noninvasive CVP measurement, enabling effective management of heart failure patients to avoid fluid overload and reduce hospital admissions by offering a cost-effective alternative to invasive systems.
Implementation Method 1
A noninvasive, self-administered system using optical measurements of venous volume and anatomical data to determine CVP through alterations in transmural pressure
Data Source
AI summary
Method and systems are provided for reliable, convenient, self-administered, and cost-effective determination of central venous pressure. The noninvasive method and apparatus use changes in transmural pressure to create detectable changes in peripheral venous vascular volume for the determination of central venous pressure. Transmural pressure changes can be manifested by intravascular or extravascular pressure changes. The system is noninvasive and uses optical measurements of venous volume in the presence of transmural pressure changes. The relationship between the transmural pressure change and the change in vascular venous volume is combined with anatomical measurements to determine the central venous pressure of the subject. Central venous pressure can be used to determine hemodynamic status of the subject to include fluid overload in the heart failure patient.