Directional Headgear Lock for CPAP Micro-Adjustment and Seal Hold
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Solution Overview
Problem
Respiratory therapy systems, particularly those using non-invasive ventilation and CPAP, face challenges with headgear adjustment mechanisms that are prone to misuse and require micro-adjustments, which are difficult and time-consuming to achieve, leading to issues with maintaining a secure seal during treatment.
Innovation Solution
A directional lock mechanism with a housing, sleeve, and lock element that automatically adjusts the headgear to fit the user's head size, transitioning between contraction, locked, and yield modes to resist elongation forces, allowing for quick and convenient micro-adjustments to maintain a secure seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hook-and-loop adjustment loop is used for headgear adjustment, then the mechanism allows adjustment of headgear size, but it requires significant user interaction and is prone to misuse or mis-adjustment
Solution Approach 1:
The directional lock mechanism automatically adjusts and secures the headgear without requiring user manipulation. The ratchet mechanism self-activates when the strap is pulled, automatically locking at the appropriate position without user intervention, thereby eliminating the problems of misuse and excessive user interaction associated with hook-and-loop systems
Solution Approach 2:
The patent replaces the manual hook-and-loop fastening system with an automated directional lock mechanism featuring a ratchet and pawl system. This mechanical substitution transforms the adjustment process from a manual, user-dependent operation to an automatic, self-regulating system that eliminates the need for user judgment and manipulation
2Adaptability or versatility
If a hook-and-loop adjustment mechanism is used, then adjustment is possible, but micro-adjustment is difficult and time-consuming to accomplish
Solution Approach 1:
The directional lock mechanism performs automatic adjustment without user intervention, eliminating the time-consuming process of manual micro-adjustment. The system self-regulates the headgear tension and positioning, instantly achieving the optimal fit without requiring the user to spend time on incremental adjustments
Solution Approach 2:
The ratchet mechanism allows the headgear to quickly skip through adjustment positions as the strap is pulled, rapidly achieving the locked position without the gradual, time-consuming micro-adjustments required by hook-and-loop systems. The mechanism rushes through the adjustment process in a single pulling motion
3Reliability
If the headgear is tightened to resist blow-off force, then the seal is secured, but excessive pressure on the head may occur
Solution Approach 1:
The directional lock mechanism provides automatic feedback through its ratchet system, which only allows tightening up to the point where the seal is secure. Once the appropriate tension is achieved, the ratchet locks and prevents further tightening, thereby automatically preventing excessive pressure on the head while ensuring adequate seal security
Solution Approach 2:
The system self-regulates the tension force through the directional lock mechanism, automatically stopping at the optimal pressure point without requiring user judgment. This prevents over-tightening and excessive head pressure while maintaining sufficient seal security, as the mechanism itself controls the force application
Data Source
Figure 1
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Figure 5A~5B
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 comprises a housing and a sleeve and the catch arrangement comprises 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.