Dual-Flow Non-Invasive Ventilation for Dead Space Flushing
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Solution Overview
Problem
Conventional non-invasive ventilation systems face challenges such as user intolerance to high pressures leading to skin breakdown, discomfort, and poor patient compliance due to the need for effective mask sealing, which can cause pressure sores and other complications.
Innovation Solution
A system with a control assembly that dynamically adjusts the resistance in the primary flow path based on pressure changes within the patient interface, incorporating a movable member to regulate airflow through the primary and flushing flow paths, ensuring optimal gas delivery and reducing pressure on the patient's skin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high pressure is delivered through the patient interface to improve alveolar gas exchange, then therapy effectiveness is improved, but user intolerance increases leading to skin breakdown and discomfort
Solution Approach 1:
The patent divides the gas flow into two separate paths: a primary flow path that delivers pressurized breathing gas to the patient for therapy, and a flushing flow path that delivers gas to flush dead space and reduce pressure on the patient interface. This segmentation allows the system to provide effective therapy pressure while simultaneously reducing harmful pressure effects on the patient's skin through the flushing path.
Solution Approach 2:
The flushing flow path acts as an intermediary mechanism between the gas source and the patient interface. It introduces additional gas flow that mediates the pressure delivery, allowing the primary flow path to maintain therapeutic pressure while the flushing path reduces overall pressure on the patient's skin and mask interface, thereby preventing skin breakdown.
2Reliability
If high pressure is delivered through the patient interface to improve alveolar gas exchange, then therapy effectiveness is improved, but patient compliance decreases due to discomfort
Solution Approach 1:
By segmenting the gas delivery system into primary and flushing flow paths, the patent enables the system to maintain effective therapy pressure for improved alveolar gas exchange while simultaneously reducing discomfort through the flushing path. This reduces barriers to patient compliance without compromising therapy effectiveness.
Solution Approach 2:
The system dynamically adjusts flow parameters by providing variable resistance in the flushing flow path compared to the primary flow path. This parameter change allows optimization of both therapy effectiveness and patient comfort, thereby improving compliance by reducing discomfort associated with high pressure delivery.
3Stress or pressure
If a seal is applied to the patient interface to maintain pressure, then pressure delivery is improved, but skin pressure increases causing discomfort and breakdown
Solution Approach 1:
The patent segments the gas flow into a primary flow path that maintains necessary pressure for therapy and a flushing flow path that reduces skin pressure. The flushing path provides an alternative gas delivery route that does not require the same degree of sealing, thereby reducing skin pressure and preventing breakdown while maintaining effective pressure delivery through the primary path.
Solution Approach 2:
The flushing flow path serves as an intermediary that reduces the overall pressure burden on the patient interface seal. By providing an additional gas flow path, it mediates the pressure delivery, allowing the primary flow path to maintain therapeutic pressure while the flushing path reduces skin pressure and the need for aggressive sealing.
4Productivity
If the primary flow path is restricted to increase flushing flow, then dead space flushing is improved, but gas delivery to patient is reduced
Solution Approach 1:
The patent segments the gas flow system into a primary flow path for patient gas delivery and a flushing flow path for dead space flushing. This segmentation allows independent optimization of both functions: the primary path maintains adequate gas delivery to the patient while the flushing path provides sufficient flow to flush dead space, without one function compromising the other.
Solution Approach 2:
The system achieves multi-functionality by using a single gas source to simultaneously provide gas for patient ventilation through the primary flow path and gas for dead space flushing through the flushing flow path. This universal approach allows both gas delivery and flushing to be accomplished without requiring separate gas sources, maintaining adequate gas delivery while improving flushing efficiency.
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 pressure and minimizing gas leaks, enhancing therapy compliance by dynamically adjusting airflow resistance to match patient needs, thereby reducing skin breakdown and discomfort.
Implementation Method 1
a control assembly that is configured to open and restrict gas flow through the primary flow path... When the primary flow path is restricted, more of the gas flow... passes through the flushing flow path
Implementation Method 2
a movable member configured to move between a first position in which the movable member increases the resistance to gas flow through the primary flow path and a second position in which the movable member does not increase the resistance to gas flow through the primary flow path
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).