Mask Headgear Tension Detection for Secure Sealing Without Over-Tightening
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Solution Overview
Problem
Existing respiratory therapy masks are often uncomfortable, poorly fitting, and difficult to use, leading to reduced patient compliance and potential skin damage from over-tightening, especially during long-term use.
Innovation Solution
A patient interface with a tension-limiting headgear that alerts the user to over-tightening through audible, visual, or tactile signals, and includes a seal-forming structure designed to maintain a secure fit while minimizing discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the headgear is tightened to ensure a secure seal, then the sealing effectiveness is improved, but the risk of skin damage and patient discomfort increases
Solution Approach 1:
The patent implements a feedback mechanism through an indicator (visual, audible, or tactile) that provides real-time information to the patient about the tension applied by the headgear. When the tension exceeds a predetermined safe threshold, the indicator activates to alert the patient, enabling them to adjust the headgear to prevent skin damage while maintaining adequate sealing.
Solution Approach 2:
The patent introduces an intermediary indicator mechanism between the headgear tensioning system and the patient's skin. This indicator acts as a mediator that translates mechanical tension into perceivable signals, allowing the patient to indirectly monitor and control the tension force to avoid harmful over-tightening while maintaining effective sealing.
2Adaptability or versatility
If the headgear is made adjustable to fit different patients, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The patent divides the headgear into multiple adjustable segments or components (such as separate straps with independent adjustment mechanisms) that can be individually tuned. This segmentation allows the headgear to adapt to various patient head shapes and sizes while keeping each adjustment mechanism simple and manageable, rather than requiring a single complex adjustable structure.
Solution Approach 2:
The patent employs parameter changes by providing multiple discrete adjustment settings (e.g., different strap lengths, tension levels, or configuration options) that allow the headgear to be customized for different patients. This approach achieves high adaptability through simple parameter variations rather than complex continuous adjustment mechanisms.
3Reliability
If the tension limit detection feature is added to the headgear, then the patient safety is improved, but the device complexity increases
Solution Approach 1:
The patent implements a self-service tension monitoring system where the indicator is directly integrated into the headgear structure and automatically activates based on the mechanical tension state. The system uses the existing mechanical components (straps, buckles, or elastic elements) to trigger the indicator without requiring external power sources or complex electronic sensors, thereby improving patient safety while minimizing added complexity.
Solution Approach 2:
The patent employs simple, low-cost indicator mechanisms (such as color-changing materials, pop-up indicators, or single-use tension sensors) that provide tension limit detection without requiring expensive or complex continuous monitoring systems. These indicators are designed to be simple mechanical or material-based solutions that activate once and can be reset or replaced, achieving safety functionality with minimal complexity.
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
Improves patient compliance and comfort by preventing over-tightening, reducing skin damage, and ensuring a secure seal without excessive force, thus enhancing the effectiveness of respiratory therapy.
Implementation Method 1
a second rigid member that extends from a resilient carrier that is connected to the connection portion, the second rigid member being movable relative to the first rigid member when the connection portion is pulled by the user
Data Source
AI summary
Headgear for a patient interface includes one or more straps each having a first end for connecting to a mask. The first end of each strap includes a connection portion which is grippable by a user to pull the strap to increase a tension in the strap, a first rigid member and a second rigid member that extends from a resilient carrier that is connected to the connection portion. The second rigid member is movable relative to the first rigid member when the connection portion is pulled. At least part of the second rigid member is arranged to strike the first rigid member to cause at least an audible alert when the second rigid member travels further than a threshold distance. The resilient carrier is constructed and arranged such that the threshold distance corresponds to a desired tension limit for the strap.


