Microcurrent HME Filter for Antimicrobial Respiratory Gas
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Solution Overview
Problem
Existing heat and moisture exchangers (HMEs) do not effectively ensure that gas and moisture delivered to patients are free from contaminants such as fungi, viruses, and bacteria, posing risks to patients and healthcare workers.
Innovation Solution
Incorporating a microcurrent-generating filter (MCGF) with arrays of microcells or dots made from conductive materials like silver and zinc into the HME, which generates low-level microcurrents to filter and inactivate or kill bacteria, fungi, and viruses, while providing passive humidification and warming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional HME is used to passively heat and humidify inspired gas, then the device structure is simple and passive operation is maintained, but the gas delivered to the patient is not effectively protected from contaminants such as bacteria, fungi, and viruses
Solution Approach 1:
The patent combines multiple functions into a single integrated filter assembly: the substrate provides mechanical filtration and structural support, while embedded microcurrent-generating particles provide antimicrobial activity. This merging allows the device to simultaneously achieve filtration, microbial inactivation, and passive operation without requiring separate components for each function.
Solution Approach 2:
The patent changes the electrical parameter of the filter by incorporating conductive particles that generate microcurrents. This parameter change transforms an otherwise passive filtration substrate into an active antimicrobial surface that electrostatically inactivates pathogens, thereby improving microbial protection without significantly increasing structural complexity.
2Reliability
If conductive materials are added to generate microcurrents for killing pathogens, then microbial protection is enhanced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent uses a porous substrate structure that can accommodate and distribute conductive particles throughout its matrix. The porous nature allows for easy incorporation of particles during manufacturing processes such as filtration or coating, enabling the conductive materials to be integrated without complex assembly steps while maintaining the substrate's filtration functionality.
Solution Approach 2:
The patent creates a composite structure by combining conductive particles with the filtration substrate material. This composite approach allows the beneficial properties of both materials to coexist: the substrate provides mechanical filtration and the conductive particles provide antimicrobial activity, while the composite structure can be manufactured using modified versions of existing filtration manufacturing processes.
3Reliability
If microcurrent-generating particles are incorporated into the filter, then antimicrobial activity is achieved, but the substrate material selection becomes more limited
Solution Approach 1:
The patent applies local quality by concentrating the antimicrobial function in the form of discrete microcurrent-generating particles distributed throughout the substrate, rather than requiring the entire substrate material to possess antimicrobial properties. This allows the substrate to be made from a wide range of materials based on filtration performance requirements, while the localized particles provide the necessary antimicrobial activity.
Solution Approach 2:
The conductive particles act as intermediaries between the substrate and the pathogens. They are embedded within or on the substrate surface and serve as the active agents that generate microcurrents to inactivate pathogens, while the substrate itself remains a passive structural and filtration medium. This intermediary role allows independent optimization of substrate material selection and antimicrobial mechanism.
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 MCGF effectively reduces or eliminates pathogens in the delivered gas, ensuring a safer and more effective respiratory support by enhancing microbial protection and maintaining desired humidity and temperature levels.
Implementation Method 1
a microcurrent-generating filter capable of generating a low level microcurrent. The microcurrent-generating filter can comprise a first array comprising a pattern of microcells or dots formed from a first conductive material and a second array comprising a pattern of microcells or dots formed from a second conductive material
Implementation Method 2
which generates low-level microcurrents to filter and inactivate or kill bacteria, fungi, and viruses
Implementation Method 3
Heat and moisture exchangers (HMEs) are devices that can be used to passively heat and humidify inspired gas. HMEs collect heat and moisture from a patient's expired gas and return it to the patient during the following inspiration
Implementation Method 4
HMEs collect heat and moisture from a patient's expired gas and return it to the patient during the following inspiration
Data Source
AI summary
A heat and moisture exchanger device comprising a housing containing a microcurrent-generating filter capable of generating a low level microcurrent. A microcurrent-generating filter can reduce the number of living or active microbes.