Reusable Filtering Face Mask With Detachable Trays for Sterilization
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Solution Overview
Problem
There is a need for a reusable face mask that functions as an N95 respirator, meets Federal standards, and is capable of decontamination and sterilization, while addressing issues of complex geometries and chemical/thermal vulnerability in existing designs.
Innovation Solution
A reusable face mask design with detachable filter trays, a soft elastomeric face seal, and straps, allowing inhalations and exhalations through the same filter material, with a forward-facing port for speech intelligibility and disassembly for sterilization, manufactured via injection molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If N95 masks are designed for single-use with complicated geometries, then filtration performance is improved, but sterilization capability deteriorates
Solution Approach 1:
The mask is divided into separable components including a mask body, detachable filter trays, and removable head straps. This segmentation allows each component to be optimized independently and facilitates complete disassembly for sterilization, resolving the contradiction between maintaining complex filtration geometry and enabling sterilization capability.
2Ease of manufacture
If mask geometry is simplified for easier sterilization, then sterilization capability is improved, but fit-test compliance deteriorates
Solution Approach 1:
Different parts of the mask have different levels of geometric complexity optimized for their specific functions. The mask body maintains the complex geometry required for OSHA fit-test compliance and NIOSH filtration standards, while detachable components like filter trays use simpler geometries that facilitate sterilization, resolving the contradiction locally across different components.
3Productivity
If filter area is increased to prevent hypercapnia, then ventilation performance is improved, but device complexity deteriorates
Solution Approach 1:
The filter trays are designed to be detachable and replaceable, allowing the filter area and configuration to be dynamically adjusted based on ventilation requirements. Users can swap between different filter media types and configurations to optimize ventilation performance without permanently increasing device complexity, as the complexity is managed through modular interchangeability rather than fixed complex structures.
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 mask meets NIOSH filtration requirements, allows for easy decontamination, and supports multiple filter media types, ensuring effective protection and usability.
Implementation Method 1
An N95 mask, also referred to as an N95 respirator, is a respirator that filters 95% of airborne particles
Implementation Method 2
a soft elastomeric face seal
Implementation Method 3
transmitting sound through a diaphragm without a prohibitive amount of distortion
Data Source
AI summary
A reusable, protective face mask has two detachable filter trays that attach on each side of the mask, a soft elastomeric face seal, and straps to go around the user's head. Exhalations and inhalations can pass through the same filter material. The filter trays can accept arbitrary filter media. A forward-facing port can be used to increase speech intelligibility by transmitting sound through a diaphragm without a prohibitive amount of distortion. Manufacture of the mask is facilitated because the mask body and the other mask components can be produced by injection molding. Decontamination and sterilization are facilitated because the mask can be fully disassembled.