Membrane Vent Housing for Quiet CPAP Exhalation Control
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Solution Overview
Problem
Existing respiratory therapy devices and systems, such as CPAP and NIV, face challenges with comfort, compliance, and efficacy due to poorly fitting masks, noise, and cumbersome design, which can lead to reduced patient adherence and ineffective treatment of respiratory disorders.
Innovation Solution
A patient interface with a vent system that includes a membrane within a vent housing, allowing continuous venting of exhaled gas throughout the respiratory cycle, maintaining therapeutic pressure and reducing noise and discomfort, along with a portable RPT device for ease of use and cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a patient interface with continuous venting is used, then patient comfort and compliance are improved, but device complexity increases due to the membrane mechanism
Solution Approach 1:
The membrane in the vent system automatically responds to pressure changes within the patient interface, opening to allow exhaled CO2 to escape when pressure increases during exhalation, and closing when pressure decreases during inhalation. This self-regulating mechanism eliminates the need for external control systems, sensors, or power sources, thereby improving patient comfort without proportionally increasing device complexity.
Solution Approach 2:
The vent system employs a flexible membrane that dynamically adjusts its configuration based on internal pressure conditions. This thin film structure provides intelligent, adaptive venting behavior - allowing gas flow when needed and blocking it when not needed - achieving complex functionality through a simple, elegant mechanical design that minimizes overall system complexity.
2Object-affected harmful factors
If a membrane-based vent system is implemented, then noise is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The membrane's physical state and configuration change in response to pressure parameters within the patient interface. During exhalation, increased pressure causes the membrane to open and allow gas flow; during inhalation, decreased pressure causes it to close. This parameter-based control mechanism reduces noise by enabling smooth, pressure-driven operation without abrupt mechanical transitions, while the membrane's design accommodates reasonable manufacturing tolerances through its elastic properties and geometric configuration.
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
Improves patient compliance and comfort by reducing noise and discomfort, while maintaining therapeutic pressure, and facilitates easier use and cleaning, enhancing the effectiveness of respiratory therapy.
Implementation Method 1
the moveable portion of the membrane is elastically deformable and is configured to move radially relative to the membrane-facing surface in response to differences in pressure between an interior side of the membrane and an exterior side of the membrane
Implementation Method 2
the moveable portion of the membrane is elastically deformable
Data Source
AI summary
A vent structure may include a vent housing comprising an inlet, an outlet, at least one exhaust gas orifice, and a membrane having a first end and a second end spaced apart, the membrane having a moveable portion between the first end and the second end. The moveable portion may be spaced radially from a membrane-facing surface inside of the vent housing to form an exhaust gas flow passage therebetween to allow exhaust gas to flow from the pressurised volume through the exhaust gas flow passage to atmosphere via the exhaust gas orifice. The moveable portion may be elastically deformable and configured to move radially relative to the membrane-facing surface in response to pressure differences between an interior side of the membrane and an exterior side of the membrane to change a cross-sectional area of the exhaust gas flow passage and regulate the vent flow of gas.