Directional Headgear Lock for Mask Seal Micro-Adjustment
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Solution Overview
Problem
Existing respiratory therapy systems face challenges in maintaining a secure seal between the mask and the user's face due to the 'blow-off' force caused by the combination of the enclosure area and internal pressure, requiring adjustment mechanisms like headgear straps that are prone to misuse and difficult to micro-adjust effectively.
Innovation Solution
The implementation of a directional lock mechanism within the headgear system that automatically adjusts to the correct size and transitions between elastic, locked, and yield modes in response to external forces, utilizing a housing with a sleeve and lock element that assists in resisting elongation and allowing for quick micro-adjustments through a rack and pinion or roller lock mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a headgear arrangement with adjustment loops and hook-and-loop fasteners is used to account for variation in head size, then the interface can be adjusted to different sizes, but the system becomes difficult to micro-adjust and is prone to misuse or mis-adjustment
Solution Approach 1:
The patent changes the adjustment mechanism from a continuous hook-and-loop system to a discrete ratchet-based system with specific incremental positions. The ratchet mechanism allows the strap to be adjusted in predetermined increments (e.g., 5mm steps) rather than continuously, enabling precise micro-adjustments while preventing over-tightening through the one-way engagement design.
Solution Approach 2:
The ratchet mechanism provides automatic locking once the strap is pulled tight, eliminating the need for users to manually secure the adjustment. The pawl automatically engages with the ratchet teeth when tension is applied, providing self-locking functionality that prevents accidental loosening without requiring user intervention.
2Reliability
If the headgear is made secure to resist blow-off forces, then the mask seal is maintained, but the system becomes difficult to adjust and prone to over-tightening
Solution Approach 1:
The ratchet mechanism is designed with a maximum engagement position that physically limits how tight the strap can be adjusted. The pawl cannot engage beyond a certain point in the ratchet teeth, providing preliminary prevention against over-tightening before it can cause discomfort or damage to the user's head or the equipment.
Solution Approach 2:
The self-locking ratchet mechanism automatically maintains the secure connection without requiring continuous user attention. Once adjusted, the pawl remains engaged with the ratchet teeth, providing automatic resistance to blow-off forces throughout therapy without needing manual reinforcement or monitoring.
3Adaptability or versatility
If an adjustment mechanism requiring user interaction is used, then the headgear can be customized to head size, but the system is prone to misuse and time-consuming to adjust
Solution Approach 1:
The ratchet mechanism allows for rapid adjustment by skipping through multiple positions in a single pulling motion. Users can quickly move the strap through several ratchet increments by simply pulling it taut, eliminating the need for slow, incremental adjustments required by hook-and-loop systems. This rushing through the adjustment process significantly reduces the time required while maintaining customization capability.
Data Source
AI summary
A directional lock or a headgear or interface assembly comprising 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.