Non-Sealed Gas Therapy With Dual Flows for Dead Space Clearance
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Solution Overview
Problem
Existing respiratory therapy systems face limitations in reducing anatomical dead space and require excessive respiratory effort due to the path of exhaled gases and mouth closure, especially for patients with impaired function.
Innovation Solution
A respiratory therapy system that utilizes a non-sealed configuration with simultaneous positive and negative gas flows, where a positive flow is delivered through a first passageway and a negative flow is drawn through a second passageway, maintaining pneumatic isolation and reducing anatomical dead space without increasing airway pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high flow therapy is delivered through a nasal cannula with mouth closed, then anatomical dead space is reduced, but respiratory effort increases significantly
Solution Approach 1:
The invention divides the single gas flow path into two separate passageways: one for delivering positive gas flow and another for removing negative gas flow. This segmentation allows independent control of inspiration and expiration paths, enabling dead space clearance without forcing exhaled gases through the entire airway length, thereby reducing respiratory effort while maintaining effective dead space reduction.
2Reliability
If high flow rate is used to reduce anatomical dead space, then dead space clearance improves, but airway pressure increases
Solution Approach 1:
The invention extracts the negative gas flow path from the conventional positive pressure system. By providing a separate passageway that actively draws out exhaled gases, the system achieves dead space clearance without relying solely on high positive pressure, thereby reducing the airway pressure stress while maintaining effective ventilation.
3Reliability
If exhaled gases must travel through long airway path to escape, then dead space volume increases, but system complexity increases
Solution Approach 1:
The invention introduces a second gas passageway as an intermediary pathway that provides a direct route for exhaled gases to exit. This mediator bypasses the long airway path that would otherwise be required, efficiently reducing dead space volume while the modular passageway design keeps the added complexity manageable and clinically acceptable.
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 effectively reduces anatomical dead space and maintains oxygen concentration while minimizing respiratory effort, providing greater comfort and improved ventilation for patients with respiratory conditions.
Implementation Method 1
a positive flow of gas is delivered through a first gas passageway (126) to an airway of a patient
Implementation Method 2
a negative flow of gas is drawn through a second gas passageway (130) substantially pneumatically isolated from the first gas passageway (126)
Data Source
AI summary
A respiratory therapy system configured to deliver gases to a patient can have a non-sealed gas flow generating arrangement configured to deliver a high flow of positive gas to an airway of a patient and a negative flow of gas away from an airway of the patient. The positive and negative flows of gas can be generated simultaneously. The flow of positive and negative gases reduces exhaled gases in anatomical dead spaces of the patient.