Waterproof Film for Respiratory Pressure Sensor Moisture Protection
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Solution Overview
Problem
Mask sensors used for monitoring respiratory parameters can malfunction due to moisture accumulation from breathing, leading to inaccurate readings and potential failures, especially when used for extended periods.
Innovation Solution
A mask apparatus incorporating a waterproof film positioned between the sensor and the breathing space to prevent moisture ingress, combined with a sensor sealing member and substrate for stable fixation and pressure application, ensuring the sensor remains dry and functional.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor is exposed to the breathing space for accurate pressure sensing, then measurement precision is improved, but moisture accumulates on the sensor leading to malfunction
Solution Approach 1:
A waterproof film is introduced as an intermediary component between the pressure sensor and the breathing space. This film allows pressure transmission while blocking moisture, enabling the sensor to accurately sense pressure without direct exposure to humid breath vapor that would cause condensation and malfunction.
Solution Approach 2:
The patent employs a thin waterproof film that is flexible enough to transmit pressure changes from the breathing space to the sensor while maintaining its moisture-blocking function. The film's flexibility ensures accurate pressure sensing while its waterproof properties prevent moisture accumulation on the sensor surface.
2Reliability
If the sensor is sealed to prevent moisture ingress, then reliability is improved, but pressure sensing accuracy deteriorates
Solution Approach 1:
The waterproof film used in the patent is designed with porous characteristics that allow pressure transmission while blocking moisture molecules. The porous structure enables mechanical pressure changes to pass through to the sensor while the pore size is sufficient to prevent water vapor and liquid moisture from reaching the sensor.
Solution Approach 2:
The solution employs a composite approach combining the waterproof film with the pressure sensor and sealing structures. This composite system achieves both moisture protection and pressure sensing functionality by integrating materials with different properties - the film provides moisture barrier while maintaining pressure transmission capability.
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 solution effectively prevents moisture from reaching the pressure sensor, reducing the risk of malfunction and ensuring accurate pressure readings over extended use, thereby enhancing the reliability and longevity of the mask's monitoring capabilities.
Implementation Method 1
a film disposed in the installation space and configured to restrict permeation of moisture from the breathing space into the installation space through the communication hole
Data Source
AI summary
A mask apparatus including a mask body that defines a communication hole, a sensor mounting portion that extends from a front surface of the mask body, that surrounds the communication hole, and that defines an installation space therein, a seal coupled to a rear surface of the mask body and configured to define a breathing space between the mask body and a user, a pressure sensor accommodated in the installation space and configured to sense air pressure inside the breathing space that is in communication with the communication hole, and a film disposed in the installation space and configured to restrict permeation of moisture from the breathing space into the installation space through the communication hole.