LVAD Flow Dynamics and Hemolysis Risk Assessment
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Solution Overview
Problem
Current clinical tools lack the ability to effectively guide optimal left ventricular assist device (LVAD) settings and cannula placement, leading to complications such as hemolysis and thrombosis in patients with advanced heart failure, due to limited understanding of intraventricular blood flow dynamics.
Innovation Solution
Novel echocardiographic modalities, including 2D echo color Doppler velocimetry, are used to map blood flow velocity and calculate metrics like flow vorticity, residence time, and cumulative shear stress, allowing for non-invasive assessment of hemolysis and thrombosis risk, and optimizing LVAD positioning and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LVAD therapy is used to treat advanced heart failure, then mortality decreases and quality of life improves, but complications such as hemolysis and thrombosis occur
Solution Approach 1:
The patent implements feedback by continuously monitoring intraventricular flow patterns using echocardiography and adjusting LVAD pump settings based on real-time flow dynamics. This allows optimization of pump operation to minimize harmful effects like hemolysis and thrombosis while maintaining life-saving support.
Solution Approach 2:
The patent applies parameter changes by modifying pump speed, cannula position, and flow characteristics based on measured intraventricular flow patterns. By adjusting these parameters dynamically, the system optimizes the balance between providing adequate cardiac support and minimizing complications.
2Productivity
If pump speed is increased to improve cardiac output, then blood flow increases, but shear stress and hemolysis risk increase
Solution Approach 1:
The patent applies dynamics by making pump speed adjustable and adaptable rather than fixed. The system dynamically adjusts pump speed based on real-time intraventricular flow patterns, allowing optimization of cardiac output while minimizing shear stress and hemolysis risk through pulsatile or variable speed operation.
Solution Approach 2:
The patent uses parameter changes by varying pump speed and flow characteristics to achieve optimal balance between cardiac output and hemolysis risk. By changing operational parameters based on measured flow patterns, the system avoids excessive shear stress while maintaining adequate blood flow.
3Productivity
If continuous flow support is used to maintain cardiac output, then blood flow is sustained, but natural flow pulsatility is decreased leading to increased mixing and cardioembolic risk
Solution Approach 1:
The patent applies periodic action by implementing pulsatile flow patterns that mimic natural cardiac rhythm. This periodic variation in flow rate maintains adequate cardiac output while preserving flow pulsatility to prevent excessive blood mixing and reduce cardioembolic risk.
Solution Approach 2:
The patent uses dynamics by transitioning from static continuous flow to dynamic pulsatile flow. The system adjusts flow characteristics to include physiological pulsations, thereby maintaining cardiac output while reducing the harmful effects of excessive blood mixing and stasis.
4Object-affected harmful factors
If cannula placement is optimized to improve flow patterns, then hemolysis decreases, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by using pre-procedural planning and simulation to optimize cannula placement before implantation. By preparing and visualizing optimal cannula positions in advance using imaging and computational models, the system reduces intraoperative complexity and achieves better flow patterns with fewer adjustments.
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
These methods enable personalized risk assessment and optimization of LVAD settings, reducing hemolysis and thrombosis risks, improving patient outcomes by enhancing the characterization of cardiac physiology and guiding treatment strategies.
Implementation Method 1
2D echo color Doppler velocimetry
Implementation Method 2
echocardiographic modalities
Data Source
AI summary
Provided herein are methods for in-vivo assessment of intraventricular flow shear stress, risk of hemolysis, also the location and extent of blood flow stasis regions and inside a cardiac chamber or blood vessel. Also provided herein are systems for performing such methods. Also provided herein are methods for assessing hemolysis and/or thrombosis risk in patients implanted with an LVAD. LVAD positioning and/or speed may be adjusted based on the results obtained by using methods described herein, and the risk for hemolysis and/or thrombosis can be minimized.