Respiratory Interface with Segmented Headgear for Pressure Relief
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Solution Overview
Problem
Full face masks used for respiratory therapy often cause discomfort and pressure sores due to the elevated pressure exerted on the bridge of the nose by the headgear, which is tightened to reduce leakage.
Innovation Solution
A mask assembly with a detachable ball joint, a separately formed bias flow vent, and non-stretchable headgear, which includes a flexible forehead rest and a headgear assembly with adjustable straps to distribute the mask's load more evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the headgear is tightened to reduce leakage, then the sealing performance is improved, but the pressure on the bridge of the nose increases causing discomfort and pressure sores
Solution Approach 1:
The headgear is divided into multiple independent straps (front strap, rear strap, and side straps) that can be adjusted separately. This segmentation allows the sealing force to be distributed across multiple contact points rather than concentrated on the bridge of the nose, reducing local pressure while maintaining overall sealing effectiveness.
Solution Approach 2:
The headgear design transitions from a single-plane tightening mechanism to a three-dimensional strap system that wraps around the head. This dimensional change distributes the sealing force across the forehead, sides of the head, and rear of the head, eliminating the need to concentrate pressure on the bridge of the nose.
2Reliability
If the headgear is tightened to reduce leakage, then the sealing performance is improved, but the user comfort deteriorates
Solution Approach 1:
The headgear is divided into multiple independently adjustable straps that can be customized to fit different head shapes and sizes. This allows users to achieve adequate sealing without excessive tightening, improving comfort while maintaining reliability.
Solution Approach 2:
The headgear incorporates flexible, adjustable straps that can be dynamically configured to match the user's head geometry. This dynamic adaptability allows the system to achieve effective sealing with minimal necessary tension, reducing discomfort.
3Device complexity
If a single seal circumscribes the nose and mouth, then the mask structure is simplified, but the load distribution on the face becomes uneven
Solution Approach 1:
The sealing function is segmented into multiple contact zones created by the separate straps. Instead of one continuous seal concentrating load, the sealing pressure is divided into discrete zones at the forehead, temples, and rear of the head, improving load distribution.
Solution Approach 2:
Different portions of the headgear are designed with locally optimized properties - the front strap contacts the forehead, side straps contact the temples, and the rear strap contacts the back of the head. This local differentiation ensures even load distribution across various facial regions.
Data Source
AI summary
Interfaces for positive pressure therapy having a mask assembly, a headgear assembly and a connection port assembly are disclosed herein. The connection port assembly has a ball joint connection with the mask assembly and includes a quick release button for easily disconnecting the gases source conduit from the mask assembly. The mask assembly may include a bias flow vent that is formed separately and attached to the mask assembly. The headgear assembly encircles the rear region of the user's head and may include at least some portions that are substantially non-stretchable.