Double-Lumen Aortic Cannula Assembly for Reduced Aortic Manipulation
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Solution Overview
Problem
Conventional cardiac surgery systems face challenges in reducing the risk of neurological strokes and emboli due to aortic manipulation during cannulation and cross-clamping, with potential disruption of atheromatous plaques and mechanical stress on the aortic wall.
Innovation Solution
A double lumen cannula and clamp assembly are designed to minimize aortic manipulation by allowing simultaneous arterial perfusion and cardioplegia delivery through separate lumens, with a clamp assembly that aligns and interlocks with the cannula to provide mechanical isolation and reduce mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If separate cannulas and cross clamp are used for arterial perfusion and cardioplegia delivery, then functional separation is achieved, but aortic manipulation and mechanical stress increase
Solution Approach 1:
The patent combines multiple functions (arterial perfusion and cardioplegia delivery) into a single double lumen cannula. The cannula has a first lumen for arterial perfusion and a second lumen for cardioplegia delivery, both with orifices facing opposite directions. This merging eliminates the need for separate cannulas and reduces aortic manipulation while maintaining functional separation of blood flow paths.
2Stability of the object's composition
If clamp is placed between separate cannulas, then mechanical isolation of aorta is achieved, but device complexity and manipulation increase
Solution Approach 1:
The clamp is integrated with the double lumen cannula to form a single assembly. The clamp includes a first arm and second arm that can be positioned on opposite sides of the aorta, with the cannula positioned between them. This integration maintains mechanical isolation of the aorta while reducing the number of separate components and simplifying the overall device.
3Adaptability or versatility
If multiple separate cannulas are inserted, then separate perfusion paths are established, but risk of stroke and emboli increases
Solution Approach 1:
The double lumen cannula provides separate perfusion paths within a single device. The first lumen delivers arterial perfusion blood flow while the second lumen delivers cardioplegia solution, with orifices facing opposite directions to ensure proper flow distribution. This merging approach maintains the necessary separate perfusion paths while reducing aortic manipulation and the associated risk of stroke and emboli.
Data Source
AI summary
Cardiothoracic surgical devices with a dual lumen cannula (8) that cooperates with a clamping assembly (35) for facilitating a CPB. The dual lumen cannula (8) has a distal end portion (8d) configured to reside inside an aorta (A) of a patient. The distal end portion (8d) has a first lumen (9) and a second lumen (10) in fluid isolation. The first lumen (9) has a lumen orifice (13) that faces a first direction inside the aorta and the second lumen (10) comprises a lumen orifice (15) that faces a second direction that is different than the first direction inside the aorta. The clamp assembly (35) is coupled to the dual lumen cannula (8) and configured with first and second clamp arms (1351, 1352) that are configured to align with the distal end portion (8d) of the dual lumen cannula (8) and clamp against opposing external surfaces of a vessel wall of the aorta to compress the vessel wall against the distal end portion (8d) of the dual lumen cannula (8) and thereby provide first and second fluidly isolated segments of the aorta.