Curved Nasal Cannula Prongs With Turbulation for Quieter Flow
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Solution Overview
Problem
Nasal cannulas with curved prongs experience turbulent eddies and increased flow resistance, leading to noise and reduced effectiveness in delivering respiratory gases.
Innovation Solution
Incorporation of turbulation elements on the inside curve of the prong to induce turbulence in the boundary layer, reducing flow separation and noise, and enhancing gas delivery efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a curved prong is used to match the profile of the nares, then patient comfort and ease of operation are improved, but flow resistance and noise increase due to turbulent eddies
Solution Approach 1:
The patent applies local quality by adding turbulation elements specifically at the inside curve of the prong where flow separation occurs, while leaving the rest of the prong structure smooth. This localized modification targets the specific problem area (flow separation at the inside curve) without compromising the overall curved geometry that provides patient comfort. The turbulation elements are positioned precisely where they are needed to generate beneficial turbulence and reduce flow resistance.
Solution Approach 2:
The patent converts the harmful effect of flow separation into a beneficial outcome by intentionally introducing turbulation elements that create controlled turbulence. Instead of trying to eliminate turbulence entirely, the invention harnesses it to prevent flow separation and reduce overall flow resistance. The turbulation elements transform the potentially harmful laminar flow separation into beneficial turbulent flow that adheres better to the curved surface, reducing eddy formation and noise.
2Ease of operation
If a curved prong is used to match the profile of the nares, then ease of operation is improved, but flow separation increases leading to higher resistance
Solution Approach 1:
The patent applies local quality by adding turbulation elements specifically at the inside curve of the prong where flow separation occurs, while leaving the rest of the prong structure smooth. This localized modification targets the specific problem area (flow separation at the inside curve) without compromising the overall curved geometry that provides patient comfort. The turbulation elements are positioned precisely where they are needed to generate beneficial turbulence and reduce flow resistance.
Solution Approach 2:
The patent applies parameter changes by modifying the surface characteristics of the prong at the inside curve through the addition of turbulation elements. These elements change the surface roughness parameter and flow regime from smooth laminar flow to controlled turbulent flow. The turbulation elements alter the flow parameters (Reynolds number, boundary layer characteristics) to prevent flow separation and reduce energy loss, while maintaining the curved geometry for comfort.
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 turbulation elements minimize flow resistance and noise, allowing for higher flow rates and improved patient comfort and compliance with respiratory therapy.
Implementation Method 1
A turbulation element is on an inside curve of the prong. The turbulation element is adapted to induce turbulence in a flow of breathing gas through the interior passage in a boundary layer at the inside curve.
Implementation Method 2
The turbulation element is adapted to induce turbulence in a flow of breathing gas through the interior passage in a boundary layer at the inside curve.
Data Source
AI summary
Nasal cannulas for providing respiratory therapy to patients can have a curved prong section that has turbulation elements on the inside curve of the prong. A flow of breathing gas moving through the prong may incur less resistance and create less noise when flowing through such a prong due to the promotion of favorable flow dynamics.