Dual-Flow Non-Invasive Ventilation for Dead Space Flushing
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Solution Overview
Problem
Conventional non-invasive ventilation therapies face challenges such as user intolerance to high pressures leading to skin breakdown, discomfort, and poor patient compliance due to elevated therapy pressures, which can result in therapy failure.
Innovation Solution
A system with a control assembly that dynamically varies flow resistance in the primary flow path in response to pressure changes within the patient interface, incorporating a movable member to adjust flow through the primary flow path and a flushing flow path, enhancing gas delivery efficiency and reducing pressure on the patient interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher therapy pressures are used to improve alveolar gas exchange, then gas exchange efficiency is improved, but patient comfort deteriorates due to skin breakdown and discomfort
Solution Approach 1:
The system segments the single high-pressure flow into two separate flow paths: a primary flow path that delivers most of the gas at lower pressure, and a flushing flow path that delivers a smaller portion at higher velocity through a restricted opening. This segmentation allows the system to achieve effective dead space flushing and gas exchange without subjecting the patient's skin to high pressures, thereby resolving the contradiction between gas exchange efficiency and patient comfort.
Solution Approach 2:
The invention applies local quality by creating a high-velocity flushing flow through a restricted opening that targets specifically the dead space areas (nasal cavity, pharynx) for effective gas exchange, while the main primary flow path delivers gas at lower pressure to the patient interface. This localized high-velocity flow achieves the gas exchange benefit without requiring high pressure across the entire patient interface, thus preventing skin breakdown.
2Reliability
If higher IPAP pressure is delivered to improve gas exchange, then alveolar recruitment is improved, but patient compliance deteriorates due to elevated therapy pressures
Solution Approach 1:
The system divides the therapy flow into two segments: a primary flow path that provides the bulk of the gas delivery at lower pressure to maintain patient comfort and compliance, and a flushing flow path that provides high-velocity flow to improve dead space clearance and gas exchange. This segmentation allows the system to achieve effective IPAP benefits without requiring the patient to tolerate high pressures across the entire interface.
Solution Approach 2:
The restricted opening in the flushing flow path acts as an intermediary that converts pressure differential into high-velocity flow. Instead of directly applying high pressure to the patient interface, the system uses the pressure differential across the restricted opening to generate a focused high-velocity jet that flushes dead space effectively, thereby achieving gas exchange improvement without compromising patient compliance.
3Device complexity
If a single high-pressure flow path is used to deliver gas, then gas delivery simplicity is maintained, but dead space flushing efficiency deteriorates
Solution Approach 1:
The invention segments the gas delivery system into two distinct flow paths: a primary flow path for bulk gas delivery and a flushing flow path with a restricted opening for high-velocity dead space flushing. This segmentation, while adding structural elements, creates a relatively simple T-junction configuration that is easy to implement and maintain, while dramatically improving dead space flushing efficiency compared to a single high-pressure flow path.
Solution Approach 2:
The system utilizes pneumatic principles by employing a restricted opening in the flushing flow path that creates a high-velocity jet through pressure differential. This pneumatic mechanism naturally generates the high-velocity flow needed for effective dead space flushing without requiring additional mechanical components or complex control systems, thus improving flushing efficiency while maintaining relatively low device complexity.
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 system improves patient comfort by reducing skin breakdown and discomfort, enhances gas delivery efficiency, and increases patient compliance by dynamically adjusting flow resistance to match patient needs, thereby improving therapy effectiveness.
Implementation Method 1
control assembly that dynamically varies flow resistance in the primary flow path in response to pressure changes within the patient interface
Data Source
AI summary
Systems and methods for non-invasive ventilation are provided. The systems may include a gas source that provides breathing gases to a patient through one or more of a primary flow path (PFP) and a flushing flow path (FFP). The system may include a control assembly configured to open and restrict gas flow through the PFP. When the PFP is open, a significant portion of the gas flows through the PFP while the remaining gas flows through the FFP. When the PFP is restricted, a significant portion of the gas flows through the FFP. Increased flow through the FFP may have a high velocity (especially relative to the flow through the PFP). Gas delivered through the FFP may be used to flush dead space. One or both flow paths may contribute to inspiratory positive airway pressure (IPAP), expiratory positive airway pressure (EPAP), and/or positive end expiratory pressure (PEEP).