Dual-Lumen ECMO Cannula With Expandable Sleeve Flow Modulation
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Solution Overview
Problem
Conventional VA ECMO systems require multiple cannulas for draining blood from multiple vascular locations, increasing the risk of bleeding, vessel damage, infection, and patient discomfort due to multiple insertion sites.
Innovation Solution
A dual lumen drainage cannula with a first and second drainage tube, where the second tube is coaxially disposed through the first, and a flexible sleeve within the second tube allows for modulation of blood flow by expanding or collapsing to control fluid flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple cannulas are used to drain blood from multiple vascular locations, then complete mixed venous blood drainage is achieved, but the risk of bleeding, vessel damage, infection, and patient discomfort increases
Solution Approach 1:
The patent combines multiple drainage functions into a single cannula by integrating a first drainage tube and a second drainage tube within a unified structure. The first drainage tube drains blood from the superior vena cava while the second drainage tube drains blood from the inferior vena cava, both emptying into a common chamber that connects to the pump. This merging approach achieves complete mixed venous blood drainage while reducing the number of insertion sites from multiple to one, thereby minimizing bleeding risk, vessel damage, and infection risk associated with multiple punctures.
Solution Approach 2:
The single cannula structure performs multiple drainage functions simultaneously. The first drainage tube targets the superior vena cava for upper body venous return, while the second drainage tube targets the inferior vena cava for lower body venous return. Both tubes converge into a common chamber that interfaces with the pump, allowing the single cannula to universally handle complete venous drainage from all major vascular sources, replacing the need for separate cannulas at different insertion sites.
2Productivity
If multiple cannulas are inserted into different vascular sites, then adequate blood drainage is achieved, but the number of insertion sites increases causing more pain and discomfort
Solution Approach 1:
The patent merges multiple drainage tubes into a single integrated cannula structure where the first drainage tube and second drainage tube are both contained within the same outer cannula body. This allows blood from both the superior and inferior vena cava to be drained through a single insertion site, maintaining high drainage efficiency while significantly improving patient comfort by eliminating the need for multiple painful punctures at different body locations.
3Adaptability or versatility
If a dual lumen cannula with flexible sleeve is used, then blood flow modulation is achieved, but device complexity increases
Solution Approach 1:
The patent incorporates a flexible sleeve within the common chamber of the dual lumen cannula that can be dynamically adjusted during operation. The sleeve is positioned to be movable between an expanded configuration that restricts blood flow and a compressed configuration that permits greater blood flow. This dynamic element allows real-time modulation of blood flow rates without requiring complex external control mechanisms, achieving adaptability through a relatively simple internal movable structure.
Solution Approach 2:
The patent uses a flexible sleeve made of elastomeric material within the common chamber to control blood flow. The sleeve's flexible nature allows it to be expanded or compressed to modulate the opening through which blood flows from the drainage tubes to the pump. This flexible film approach provides effective flow control while maintaining a relatively simple overall device structure, avoiding the need for complex mechanical valves or electronic control systems.
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
The dual lumen cannula enables efficient blood drainage from multiple vascular sites with reduced insertion points, minimizing complications and enhancing patient comfort by allowing controlled blood flow modulation without the need for additional connectors.
Implementation Method 1
a sleeve positioned adjacent to an interior wall of the second drainage tube, wherein at least one wall of the sleeve is formed of a flexible material so as to be expandable and collapsible within the second drainage tube
Data Source
AI summary
A dual lumen drainage cannula configured for use in a VA ECMO system includes a first drainage tube having a proximal end, a distal end, and at least one aperture in at least one wall of the first drainage tube proximate to the distal end of the first drainage tube, and a second drainage tube having a proximal end, a distal end, and at least one aperture in at least one wall of the second drainage tube proximate to the distal end of the second drainage tube. The first drainage tube passes through the second drainage tube. The dual lumen drainage cannula also includes a sleeve positioned adjacent to an interior wall of the second drainage tube. The sleeve is formed of a flexible material so as to be expandable and collapsible within the second drainage tube.