Directional Headgear Lock for CPAP Seal Micro-Adjustment
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Solution Overview
Problem
Current respiratory therapy systems face challenges in maintaining a secure seal due to the 'blow-off' force created by pressurized air, requiring adjustable headgear that is prone to misuse and difficult to micro-adjust, especially in non-invasive ventilation and CPAP therapies.
Innovation Solution
The introduction of a directional lock mechanism within the headgear system that automatically adjusts to the correct size, transitioning between contraction, locked, and yield modes in response to external forces, utilizing a rack and pinion mechanism or roller lock to provide on-demand resistance and facilitate easy micro-adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hook-and-loop adjustment mechanism is used for headgear, then adjustment flexibility is provided, but the system requires significant user interaction and is prone to misadjustment
Solution Approach 1:
The headgear system automatically adjusts itself using a self-actuating mechanism that responds to forces applied during normal wear. The adjustment loop automatically tightens or loosens based on the forces exerted by the mask and user head movements, eliminating the need for continuous manual adjustment while maintaining adaptability to different head sizes and positions.
Solution Approach 2:
The adjustment mechanism transitions from a static hook-and-loop system to a dynamic self-regulating system. The adjustment loop incorporates a self-actuating mechanism that continuously adapts to changing forces and positions, allowing the headgear to automatically respond to dynamic conditions during sleep or use without requiring user intervention.
2Adaptability or versatility
If a hook-and-loop adjustment mechanism is used for headgear, then adjustment flexibility is provided, but micro-adjustment is difficult and time-consuming
Solution Approach 1:
The self-actuating adjustment mechanism automatically performs micro-adjustments in response to forces applied during normal wear. Small changes in head position, mask fit, or applied forces trigger automatic micro-adjustments of the adjustment loop, eliminating the time-consuming manual micro-adjustment process while maintaining precise adaptability.
Solution Approach 2:
The system pre-configures the adjustment loop with a self-actuating mechanism that anticipates and automatically responds to adjustment needs before they become problematic. The mechanism is designed to continuously make small corrective adjustments, preventing the need for time-consuming manual micro-adjustments during use.
3Measurement precision
If the adjustment loop is made more complex to enable micro-adjustment, then adjustment precision is improved, but device complexity increases
Solution Approach 1:
Instead of adding complex manual micro-adjustment mechanisms, the system uses a self-actuating adjustment loop that automatically makes precise adjustments in response to applied forces. The precision is achieved through the intelligent response of the self-actuating mechanism to force variations, not through added mechanical complexity.
Solution Approach 2:
The system achieves micro-adjustment precision by changing the operational parameters of a relatively simple adjustment loop mechanism. The self-actuating feature allows the same basic mechanism to achieve high precision through force-responsive parameter changes rather than through mechanically complex multi-position adjustment systems.
Data Source
AI summary
A directional lock or a headgear or interface assembly has one or more directional locks that include a catch arrangement for initiating or assisting in movement of a lock member of the direction lock. In some configurations, the catch arrangement assists movement of the lock member in only a portion of a range of travel of the lock member. In some configurations, the directional lock has a housing and a sleeve and the catch arrangement has a catch arm carried by the sleeve. The catch arm includes a catch end that contacts the lock member, which can be a lock washer in some configurations.