Headgear Assemblies with Elastic-to-Inelastic Transformation
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Solution Overview
Problem
Conventional respiratory therapy systems face challenges in providing a secure and adjustable interface, as existing headgear mechanisms require user interaction and are prone to misuse or mis-adjustment, making it difficult to achieve a proper fit and maintain it throughout treatment.
Innovation Solution
A headgear system that automatically adjusts to the correct size and transforms from an elastic to an inelastic state, featuring a combination of elastic and inelastic portions with directional locking mechanisms to resist movement and maintain a stable fit, reducing the need for user intervention and minimizing mask movement during therapy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional headgear adjustment mechanisms are used, then the interface can be adjusted to fit different head sizes, but the system requires user interaction and is prone to misuse or mis-adjustment
Solution Approach 1:
The headgear system automatically adjusts to the user's head size without requiring manual intervention. The elastic portions self-regulate to provide the correct fit, eliminating the need for users to manually adjust hooks and loops, thereby preventing misuse and mis-adjustment while maintaining adaptability to different head sizes.
Solution Approach 2:
The system changes the physical state of the headgear material from elastic during adjustment to inelastic during use. This parameter change allows the headgear to automatically adapt to different head sizes during donning, then maintain a stable, secure fit during therapy without requiring further user adjustment.
2Adaptability or versatility
If elasticated headgear is used, then the system can accommodate variation in head size, but micro-adjustment is difficult and time-consuming to accomplish
Solution Approach 1:
The headgear performs self-adjustment through the elastic portions automatically conforming to the user's head dimensions during donning. This eliminates the need for time-consuming manual micro-adjustments while maintaining the ability to accommodate different head sizes, reducing adjustment time to merely the act of putting on the device.
Solution Approach 2:
The elastic portions are pre-configured to provide automatic adjustment during the donning process itself. The headgear performs the adjustment action preliminarily, during initial placement, rather than requiring separate micro-adjustment steps afterward, thereby eliminating time loss associated with post-donning adjustments.
3Force
If the headgear is made inelastic to resist blow-off force, then the mask remains stable, but the headgear cannot automatically adjust to the correct size
Solution Approach 1:
The headgear dynamically changes its mechanical properties from elastic to inelastic at different stages of use. During donning, the elastic portions allow automatic size adjustment; during therapy, the inelastic portions provide stable resistance to blow-off forces. This dynamic transition resolves the contradiction between adaptability and force resistance.
Solution Approach 2:
The system changes the elasticity parameter of the headgear material based on operational phase. The elastic portions provide adaptability during adjustment, then transition to an inelastic state to provide stable force resistance, enabling both automatic size adjustment and blow-off force resistance without compromise.
4Ease of operation
If conventional adjustment loops with hook-and-loop fasteners are used, then the headgear can be adjusted, but the mechanism is prone to over-tightening and misuse
Solution Approach 1:
The headgear eliminates manual adjustment mechanisms entirely, using elastic portions that self-regulate to provide the correct fit. This removes the possibility of over-tightening and misuse associated with hook-and-loop fasteners, while maintaining adjustment capability through automatic adaptation to the user's head size.
Solution Approach 2:
The system replaces complex, error-prone mechanical adjustment mechanisms with simple elastic material that inherently limits adjustment range. The elastic portions act as a self-limiting mechanism that prevents over-tightening by design, eliminating the reliability issues of conventional adjustable fasteners.
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 ensures a secure and comfortable fit, reduces mask movement, and allows for quick micro-adjustments, improving user satisfaction and therapy compliance by automatically adapting to changes in fit and pressure.
Implementation Method 1
a first elastic side portion on a first side of the headgear assembly, and a second elastic side portion of a second side of the headgear assembly
Implementation Method 2
The at least one restriction arrangement is configured to selectively engage the at least one filament to resist movement of the at least one filament relative to the at least one restriction arrangement
Data Source
AI summary
A headgear system and/or an interface assembly incorporating a headgear system that, in some configurations, is configured to transform from elasticated or “stretchy” behavior to “inelastic” behavior at least in response to normal or expected forces encountered during the intended therapy. In some configurations, upon fitment to the head of a user, the system automatically adjusts toward or to an appropriate size.