CPAP Mask Headgear With Break-Fit Loop for Leak Control
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Solution Overview
Problem
Existing CPAP masks with elastic straps face issues with leaks at higher pressures and discomfort due to varying pressure levels, as the elastic straps stretch and reduce the force against the face.
Innovation Solution
The use of generally inelastic headgear with an adjustment mechanism and a break-fit assembly that elongates upon exceeding a preselected force, allowing for easier donning and proper fit, while resisting elongation during normal use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If elastic headgear is used, then the headgear can be easily stretched for donning, but the headgear loses force against the face at higher pressures causing leaks
Solution Approach 1:
The headgear system is segmented into two distinct components: an inelastic headgear structure for maintaining seal force and an elastic strap portion for facilitating donning. The elastic strap can be stretched during donning and then detached or relaxed, while the inelastic headgear maintains consistent tension against the face during use, preventing leaks without the downsides of continuous elastic tension.
Solution Approach 2:
The elastic component is extracted as a separate, removable element from the headgear system. The elastic strap is used temporarily during donning and then can be removed or loosened, while the primary headgear structure remains inelastic to maintain reliable sealing force during the actual use period.
2Reliability
If inelastic headgear is used, then the headgear maintains consistent force against the face, but the headgear is difficult to fit and use
Solution Approach 1:
An elastic strap serves as an intermediary element that bridges the gap between the inelastic headgear structure and the user's head during the donning process. This elastic mediator allows the inelastic headgear to be positioned and fitted easily by stretching the strap, after which the strap can be removed or loosened, leaving the inelastic headgear to maintain its sealing function.
Solution Approach 2:
The elastic strap is used preliminarily during the donning phase to facilitate positioning and fitting of the inelastic headgear. Once the headgear is in place, the elastic component's job is complete and it can be removed or relaxed, preventing it from interfering with the seal during actual use.
3Adaptability or versatility
If elastic straps are used, then the headgear can accommodate head movement, but the mask moves away from the face at higher pressures
Solution Approach 1:
The system segments the functions of adaptability and pressure consistency into different components. The inelastic headgear structure maintains consistent pressure against the face, while a separate elastic component or adjustment mechanism provides the necessary adaptability for head movement without compromising the sealing pressure.
Solution Approach 2:
Different parts of the headgear system have different mechanical properties: the main headgear structure is inelastic to maintain consistent sealing pressure, while specific localized elements (such as adjustment straps or connection points) have elastic properties to accommodate head movement and positioning needs.
Data Source
AI summary
An interface includes a mask. The mask includes a frame and a seal supported by the frame. Headgear is connected to the mask. The interface includes at least one of an adjustment mechanism that can be set to a use length for a loop defined by the mask and the headgear and a break-fit assembly that can selectively lengthen the loop defined by the mask and the headgear and return to the use length.