Forehead Support with Ratchet Adjustment for CPAP Masks
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Solution Overview
Problem
Conventional forehead supports for facial masks used in CPAP treatments have a limited range of adjustment, which does not provide a universal fit for various users, leading to discomfort and potential facial sores due to inadequate fit and pressure distribution.
Innovation Solution
A forehead support system with a frame connector, a movably mounted forehead cushion support, and an adjustment knob with a threaded shaft and ratchet mechanism, allowing for indexed incremental adjustments and greater flexibility in positioning to accommodate different head sizes and shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional forehead supports are used with limited adjustment range, then the device complexity is reduced, but the adaptability to different users' head sizes and shapes deteriorates
Solution Approach 1:
The forehead support is designed with movable and adjustable components including a pivot joint at the top of the mask frame and an adjustable arm with multiple positioning holes. This dynamic structure allows the support to be repositioned in different directions and angles to accommodate various head sizes and shapes, transforming a static limited-adjustment device into a dynamic multi-position system that adapts to different users without requiring complete redesign
Solution Approach 2:
The adjustable forehead support mechanism serves multiple functions: it provides structural support for the mask, enables adaptation to different head sizes and shapes through repositioning, and maintains mask stability during use. By integrating these functions into a single adjustable component rather than requiring separate devices for each function, the invention achieves universality across different user populations while managing device complexity
2Reliability
If mask straps are tightened to improve mask fit and reduce leakage, then the reliability of the seal is improved, but harmful effects on the wearer's face such as discomfort, marks and facial sores increase
Solution Approach 1:
The forehead support acts as an intermediary element between the mask frame and the wearer's forehead. It provides a stable contact point that distributes the mask's weight and sealing forces away from sensitive facial areas like the nose and cheeks, redirecting pressure to the forehead where it is better tolerated. This intermediary structure maintains seal reliability while reducing harmful effects on the face
Solution Approach 2:
The forehead support is designed with a padded or cushioned contact surface that interfaces with the wearer's forehead before the mask straps apply full tension. This pre-cushioning element prepares the interface by distributing initial forces and preventing direct concentration of pressure on sensitive areas, thereby maintaining seal integrity while preventing discomfort and facial sores before they occur
3Ease of operation
If the forehead support is made fixed to simplify the structure, then the device complexity is reduced, but the ease of operation for adjustment deteriorates
Solution Approach 1:
The forehead support is segmented into distinct components: a fixed mounting base attached to the mask frame, a movable adjustable arm, and a positioning mechanism with discrete adjustment holes. This segmentation allows the complex adjustment function to be broken down into simple, independent parts that can be manufactured separately and assembled, making the overall adjustment mechanism easier to operate while managing complexity through modular design
Solution Approach 2:
The adjustment mechanism replaces complex continuous mechanical adjustment systems with a simpler discrete positioning system using pre-drilled holes and pins or snap-fit mechanisms. Instead of requiring continuous rotation or sliding adjustments, the user simply moves the support to one of several predetermined positions, substituting a potentially complex mechanical adjustment system with a simpler discrete selection system that is easier to operate
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 enhanced forehead support system provides a more universal fit, reducing discomfort and pressure points by allowing for a wider range of adjustments, thus improving the fit for a larger number of users and enhancing the overall comfort and effectiveness of CPAP treatments.
Implementation Method 1
an adjustment knob movably mounted to the frame connector and threadably engaged with the forehead cushion support such that turning movement of the adjustment knob causes the forehead cushion support to be moved between the retracted and extended positions
Implementation Method 2
The ratchet bump is adapted to selectively engage a series of ridges provided to the frame connector to provide indexed incremental adjustment
Data Source
Figure 1-1
Figure 1-2
Figure 1-3~1-4
AI summary
Forehead support (12) for a mask assembly (10), comprising a frame connector (20) provided to a mask frame (14), a forehead cushion support (60) movably mounted to the frame connector for generally linear movement between retracted and extended positions with respect to the frame connector, and an adjustment knob (40) movably mounted to the frame connector and threadably engaged with the forehead cushion support such that turning movement of the adjustment knob causes the forehead cushion support to be moved between the retracted and extended positions, wherein the adjustment knob includes a resilient prong (54) having a ratchet bump (56), the ratchet bump adapted to selectively engage a series of ridges (26) provided to the frame connector to provide indexed incremental adjustment.