Bi-directional Cannula with Deployable Tubular Extension
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Solution Overview
Problem
Current perfusion cannulas for peripheral arterial cannulation often compromise antegrade blood flow to the lower limb during cardiac surgeries, requiring additional hardware and increased surgical time to achieve bi-directional perfusion, and face challenges with perfusion port positioning and deployment.
Innovation Solution
A perfusion cannula with a tubular extension that can be selectively deployed and retracted to provide bi-directional fluid flow, featuring a valve mechanism and adjustable elbow for easy deployment and withdrawal, allowing for controlled antegrade and retrograde blood flow without obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a perfusion port is included at the antegrade side of the cannula to provide blood flow to the lower extremity, then bi-directional perfusion capability is improved, but the cannula deployment and withdrawal process becomes obstructed and complicated
Solution Approach 1:
The perfusion port is designed as a dynamic structure that can be deployed and retracted. During deployment, the port extends from the cannula body to provide antegrade perfusion. During withdrawal, the port retracts into the cannula body to eliminate obstruction. This dynamic transformation allows the same structure to serve dual purposes: providing bi-directional perfusion when needed and facilitating smooth withdrawal when not needed.
Solution Approach 2:
The perfusion port is nested within the cannula body when in the retracted position. The port can be inserted into and removed from the cannula body, allowing it to be stored compactly during the withdrawal phase. This nesting arrangement eliminates the obstruction problem during withdrawal while maintaining the perfusion capability when deployed.
2Reliability
If the perfusion port is carefully positioned and constructed to provide proper perfusion flow, then perfusion effectiveness is improved, but the risk of arterial wall collapse or constriction against the port increases
Solution Approach 1:
The perfusion port is designed to be deployable and retractable, allowing it to be positioned optimally during the perfusion phase to ensure effective blood flow to the lower extremity. When not in use, the port can be retracted to eliminate the risk of arterial wall collapse or constriction. This dynamic positioning resolves the conflict between maintaining effective perfusion and preventing harmful arterial wall interactions.
3Quantity of substance
If an additional perfusion cannula is included to provide antegrade blood flow, then blood flow to the lower extremity is improved, but device complexity and surgical time increase
Solution Approach 1:
The cannula is designed with integrated bi-directional perfusion capability, allowing a single device to perform both retrograde perfusion (to the heart) and antegrade perfusion (to the lower extremity). The cannula includes both a distal opening for retrograde flow and a perfusion port for antegrade flow, eliminating the need for separate additional cannulas and perfusion lines. This multi-functional design reduces device complexity and surgical time while maintaining adequate blood flow to the lower extremity.
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
Enables selective bi-directional perfusion without obstructing perfusion ports, facilitating easy cannula deployment and withdrawal, and ensuring consistent blood flow to the lower extremity during surgical procedures.
Implementation Method 1
in the deployed configuration the tubular extension inner lumen provides a fluid flow path from the tubular member inner lumen to the body lumen in a second flow direction, wherein the second flow direction is opposite to the first flow direction
Data Source
AI summary
A bi-directional cannula for perfusing blood in two directions. The cannula has a distal opening in fluid communication with a cannula first lumen. The cannula has a secondary opening proximal of the distal opening, and may include a movable tubular extension selectively extendable from the cannula via the secondary opening. The tubular extension may be in fluid connection with the cannula first lumen and/or a cannula second lumen. The tubular extension may have distal and/or side openings, with the openings providing antegrade fluid perfusion. The cannula second lumen may be separate from the first lumen, so that perfusion can be selectively provided to just the cannula distal opening, just the secondary opening/tubular extension, or simultaneously to both the distal opening and secondary opening/tubular extension.