Respiratory Mask Headgear Adjustment for Low-Wear Filament Locking
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Solution Overview
Problem
Existing respiratory masks face challenges in maintaining a stable, airtight seal due to shear stress on the filament components, leading to wear and discomfort during CPAP therapy, especially when subjected to varying pressures.
Innovation Solution
A directional adjustment unit with a frictional engagement member having a linear aperture and movable configuration, which engages a flat portion of the filament, reducing shear stress and providing a secure, adjustable fit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional headgear strap with filament is used to secure the respiratory mask, then the mask can be held in place on the patient's face, but shear stress on the filament causes wear and reduces reliability over time
Solution Approach 1:
The patent changes the geometric parameters of the filament cross-section from circular to flat/rectangular, and modifies the aperture shape in the frictional engagement member to match. This parameter change distributes the contact stress more evenly across the filament surface, reducing peak shear stress values and preventing filament wear while maintaining the securing function.
2Ease of operation
If the headgear is made adjustable to accommodate different patients, then ease of operation improves, but device complexity increases due to additional adjustment mechanisms
Solution Approach 1:
The frictional engagement member is designed to automatically engage and disengage the flat filament through friction-based interaction. When the filament is pulled through, the frictional member tilts/engages to provide resistance; when retracted, it releases automatically. This self-regulating mechanism provides adjustment functionality without requiring motors, sensors, or complex control systems.
3Stability of the object's composition
If the headgear provides strong holding force to maintain seal position, then the mask stability improves, but comfort deteriorates due to excessive tension on the patient's face
Solution Approach 1:
The frictional engagement member dynamically adjusts its frictional resistance based on the direction and magnitude of filament movement. During normal wear, it provides sufficient holding force to maintain mask position. During adjustment or removal, it allows controlled movement. This dynamic behavior optimizes the balance between stability and comfort without requiring active control.
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 solution enhances the stability and comfort of the mask seal by minimizing wear on components and ensuring a secure fit throughout the night, even at low CPAP pressures.
Implementation Method 1
at least one movable frictional engagement member, the at least one frictional engagement member having an aperture forming a cavity extending through the at least one frictional engagement member
Data Source
AI summary
According to this disclosure there is provided various embodiments of directional adjustment unit for a headgear for a respiratory mask, comprisinga housing,at least one frictional engagement member arranged to be movable with respect to the housing, the at least one frictional engagement member having an aperture extending therethrough for receiving a filament of a strap of the headgear therethrough, wherein the at least one frictional engagement member in a first movable configuration provides a disengaged configuration with respect to the filament, and in a second movable configuration provides an engaged configuration with respect to the filament.Also disclosed herein are various headgear, yoke assemblies, mask assemblies, mask frames and headgear filaments, some of which are for use with such a directional adjustment unit.