Optical CVP Measurement via Neck Video Motion Amplification
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Solution Overview
Problem
Conventional methods for measuring central venous pressure (CVP) are either invasive, causing trauma and expense, or noninvasive methods are inconsistent due to reliance on visual estimates, making them less suitable for routine use outside clinical environments.
Innovation Solution
An optical method using video capture and processing to amplify pulsatile motions in the neck, allowing for noninvasive and reproducible CVP measurement by determining the distance between amplified pulsatile motion peaks and anatomical features, which can be automated for reduced professional involvement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive catheter insertion is used to measure CVP, then measurement accuracy is improved, but patient trauma and procedural complexity increase
Solution Approach 1:
The patent replaces the mechanical invasive catheter insertion method with an optical imaging system using video capture and motion amplification algorithms to measure CVP noninvasively through external jugular vein pulsations
Solution Approach 2:
The patent uses the external jugular vein as an intermediary marker to indirectly measure central venous pressure, avoiding direct catheter insertion into the heart while still obtaining CVP data through optical tracking of venous pulsations
2Object-affected harmful factors
If conventional noninvasive visual estimation is used to measure CVP, then patient trauma is reduced, but measurement consistency and reliability deteriorate
Solution Approach 1:
The patent replaces subjective visual estimation with an automated optical motion detection and amplification system that objectively measures venous pulsation characteristics
Solution Approach 2:
The system provides real-time visual feedback through motion amplification that enhances the visibility of subtle venous pulsations, allowing for more accurate and consistent measurement of pulsation amplitude and frequency
3Measurement precision
If skilled physician training is required for CVP measurement, then measurement quality is improved, but accessibility and ease of operation worsen
Solution Approach 1:
The system performs automated measurement and analysis without requiring skilled interpretation, with the device itself detecting, amplifying, and measuring venous pulsations to generate CVP values
Solution Approach 2:
The patent replaces the need for skilled human judgment with an automated computational algorithm that processes video data and calculates CVP measurements objectively
Data Source
AI summary
This document describes optical central venous pressure measurement. To determine the central venous pressure (CVP) of a person optically, video of a right side of the person's neck is captured. By way of example, a medical professional records a video of the right side of the person's neck using a smartphone. The right side of the person's neck is captured because it is where the person's external and internal jugular veins are located and pulsatile motions that are usable to measure CVP occur in those veins. The video is then processed according to video motion amplification techniques to generate a reconstructed video of the right side of the person's neck. In the reconstructed video, the pulsatile motion of the person's venous system that occurs at the right side of their neck is visually amplified. Using the reconstructed video, measurements are made of a distance between a peak of the visually-amplified pulsatile motion and an anatomical feature of the person. The measured distance between the peak of the visually-amplified pulsatile motion and the anatomical feature is used to determine CVP of the person. These techniques enable CVP to be determined without relying on estimates made by medical professionals.