Nasal Cannula Flow Restrictor for Equalizing Gas Distribution
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Solution Overview
Problem
Nasal cannula systems often result in uneven gas flow rates between prongs, leading to discomfort and inefficient CO2 flushing due to uneven pressure distribution, which can be exacerbated by flow dynamics impacting the internal walls of the cannula.
Innovation Solution
Incorporating a localized reduction in cross-sectional area within the nasal cannula cavity between the prongs, defined by features such as an annular ridge or manifold, to regulate and equalize gas flow rates, thereby reducing pressure differences and improving flow dynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If gas flow is supplied to both sides of the nasal cannula body, then gas delivery coverage is improved, but flow distribution uniformity deteriorates due to uneven pressure distribution
Solution Approach 1:
The patent applies local quality by introducing a flow restrictor at a specific location within the cavity (between the prongs) to locally modify flow characteristics. This restrictor creates a localized zone of reduced cross-sectional area that equalizes pressure distribution specifically in the region between the prongs, allowing gas to be supplied to both sides while maintaining uniform flow distribution through controlled local intervention.
2Productivity
If flow rate is increased to improve therapeutic efficacy, then CO2 flushing efficiency is improved, but patient comfort deteriorates due to uneven pressure distribution
Solution Approach 1:
The patent applies parameter changes by modifying the physical geometry of the cavity through the flow restrictor, which changes the cross-sectional area parameter in a localized region. This geometric modification allows the system to maintain higher flow rates for improved CO2 flushing efficiency while the restrictor simultaneously equalizes pressure distribution to preserve patient comfort by preventing localized pressure spikes.
3Ease of manufacture
If the cannula body structure is simplified, then manufacturing ease is improved, but flow control capability deteriorates
Solution Approach 1:
The patent resolves this contradiction by implementing a flow restrictor as a localized feature within the existing cannula body structure. Rather than fundamentally redesigning the entire cannula body, the restrictor is introduced as a specific element (defined by reduced cross-sectional area) within the cavity, maintaining overall structural simplicity and ease of manufacture while providing targeted flow control capability where needed.
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 solution achieves a more even gas flow distribution between prongs, enhancing patient comfort and therapeutic efficacy by ensuring consistent CO2 flushing and reducing discomfort.
Implementation Method 1
The central body portion comprises at least one localized reduction in cross-sectional area in the space of the cavity between the prongs
Implementation Method 2
uneven pressure distribution, which can be exacerbated by flow dynamics impacting the internal walls of the cannula
Data Source
AI summary
Nasal cannulas for providing respiratory therapy to patients can have a body, two prongs extending from the body, and a gases inlet on one side of the body. There can be a throttle or internal localized reduction in the cross-sectional area of a cavity defined by the internal walls of the cannula body in between the prongs. In at least some arrangements, the throttle can partially or substantially fully equalize flow between the prongs of the cannula.