Hybrid Nasal Cannula-Mask Interface for Dead Space Flushing
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Solution Overview
Problem
Conventional respiratory interfaces, both sealing and non-sealing, face challenges in effectively managing dead space and expiratory pressure, particularly in treatments like CPAP, leading to inefficiencies and discomfort for users.
Innovation Solution
A non-sealing nasal cannula interface combined with a sealing mask, where the cannula delivers breathing gases at a flow rate exceeding peak inspiratory demands, continuously flushing the mask and pharynx with fresh gases, and a mask with a seal to regulate pressure, incorporating adjustable features for user comfort and effective expiratory pressure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a non-sealing nasal cannula is used to deliver breathing gases, then the gases can be administered at greater temperature and humidity, but the dead space cannot be effectively flushed and expiratory pressure cannot be controlled
Solution Approach 1:
The interface is segmented into two functional components: a sealing mask that provides dead space flushing and pressure control, and a non-sealing nasal cannula that delivers heated/humidified gases. This segmentation allows each component to specialize in its optimal function without compromise.
Solution Approach 2:
The patent merges the sealing mask and non-sealing nasal cannula into a hybrid interface system where the cannula is positioned within the mask. This combination integrates the advantages of both sealing and non-sealing approaches, enabling simultaneous dead space management and comfortable gas delivery.
2Stress or pressure
If a sealing mask is used to control expiratory pressure, then pressure regulation is achieved, but the interface complexity and user discomfort increase
Solution Approach 1:
The mask seal provides dynamic pressure regulation that adapts to user breathing patterns, while the cannula remains relatively static. This dynamic sealing approach allows pressure control without requiring complex mechanical adjustment mechanisms.
Solution Approach 2:
The seal is localized to specific regions of the mask where pressure control is most effective, rather than requiring a complete seal around the entire face. This localized sealing reduces interface complexity while maintaining pressure regulation capability.
3Stress or pressure
If a sealing mask is used to regulate mask pressure by reducing gas leaks, then pressure control is improved, but the device complexity increases
Solution Approach 1:
The mask seal automatically regulates pressure through its inherent sealing properties without requiring complex active control mechanisms. The system self-adjusts to maintain pressure by preventing gas leaks through the seal interface.
Solution Approach 2:
The seal acts as an intermediary element between the mask interior and exterior, mediating pressure control by selectively preventing gas leakage while allowing controlled exhaust through designated pathways.
4Reliability
If high flow rates are delivered through the nasal cannula, then dead space flushing is improved, but the device complexity increases
Solution Approach 1:
The system uses pneumatic principles to deliver high flow rates through the nasal cannula. The breathing gas flow itself provides the flushing action, eliminating the need for additional mechanical pumping or complex flow control devices.
Solution Approach 2:
The nasal cannula maintains continuous high flow delivery throughout the breathing cycle, ensuring constant dead space flushing. This continuous action is achieved through the inherent flow characteristics of the breathing support system rather than intermittent mechanical intervention.
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 interface reduces anatomical dead space, enhances gas exchange, improves user tolerance by delivering gases at optimal temperature and humidity, and provides adjustable pressure control, addressing inefficiencies and discomfort in conventional systems.
Implementation Method 1
the cannula configured to deliver breathing gases to the nares of a user at a flow rate exceeding the intended user's peak inspiratory flow requirements so that the mask and the user's pharynx are flushed continuously with fresh breathing gases to reduce dead space
Implementation Method 2
the mask including a seal configured to seal with a user's face to allow the interface to be pressurised
Implementation Method 3
the provision of Continuous Positive Airway Pressure (CPAP) or other forms of Positive Airway Pressure (PAP) to support a user's respiratory system
Data Source
AI summary
A user interface comprising a non-sealing nasal cannula and a mask arranged about the nasal cannula, the mask including a seal configured with a user's face to allow the interface to be pressurised, the cannula configured to deliver breathing gases to the nares of a user at a flow rate exceeding the intended user's peak inspiratory flow requirements so that the mask and the user's pharynx are flushed continuously with fresh breathing gases to reduce dead space.