Removable Adsorbent Cartridge Beds for Quiet Portable Oxygen Concentrators
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Solution Overview
Problem
Existing stationary home oxygen concentrators are large, noisy, and require frequent maintenance by a technician, which increases cost and reduces the purity of oxygen delivery, while removing water removal components to reduce cost shortens the service life of the adsorbent beds.
Innovation Solution
A modular, user-replaceable adsorber design with integrated cooling and acoustic damping airflow system, allowing easy maintenance and replacement of adsorbent beds without tools, combined with AC-DC power options and a diagnostic interface to minimize size, noise, and maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If water removal components are removed to reduce cost, then device cost is reduced, but service life of adsorbent beds is shortened
Solution Approach 1:
The system automatically monitors adsorbent bed performance through sensors that detect oxygen concentration and other parameters. The controller uses this data to determine when adsorbent beds need replacement, eliminating the need for manual inspection and enabling predictive maintenance that optimizes both cost and service life.
Solution Approach 2:
Sensors continuously monitor the concentration of oxygen and other gases in the output stream, providing feedback to the controller. This feedback loop allows the system to adjust operating parameters and predict adsorbent bed degradation, enabling optimal replacement timing that balances cost reduction with maintaining adequate service life.
2Ease of repair
If adsorbent beds are made user-replaceable to reduce maintenance needs, then ease of maintenance is improved, but device complexity increases
Solution Approach 1:
The adsorbent bed system is segmented into modular cartridges that can be independently removed and replaced by users. Each cartridge is a self-contained unit with standardized interfaces, allowing easy replacement without affecting other system components. This segmentation simplifies maintenance while the standardized design minimizes the complexity increase.
Solution Approach 2:
The system includes an intermediary controller that manages the complexity of adsorbent bed replacement. The controller provides user guidance, monitors replacement status, and adjusts operating parameters automatically, shielding the user from complex technical details while enabling easy maintenance.
3Ease of operation
If concentrator size is reduced for portability, then ease of operation is improved, but noise level increases
Solution Approach 1:
The concentrator uses a nested modular architecture where compact adsorbent bed cartridges are integrated within the main housing. This nesting allows efficient space utilization, enabling a smaller overall device size while maintaining adequate separation between noise-generating components and user contact areas, thus reducing perceived noise levels.
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 results in a compact, quiet, and cost-effective oxygen concentrator that maintains high oxygen purity over an extended period without requiring professional service, reducing overall maintenance costs and improving user convenience.
Implementation Method 1
These home concentrators are typically referred to as stationary concentrators, as they are not designed to be carried by a patient, distinguishable from portable concentrators which are designed to be carried by a patient for most ambulatory activities. Most of these oxygen concentrators are based on Pressure Swing Adsorption (PSA), Vacuum Pressure Swing Adsorption (VPSA), or Vacuum Swing Adsorption (VSA) designs which feed compressed air to selective adsorption beds
Implementation Method 2
the beds utilize a zeolite adsorbent to selectively adsorb nitrogen, resulting in pressurized, oxygen-rich product gas
Implementation Method 3
In these systems the adsorption beds may also include desiccant layers before the main adsorbent layer to remove water and other contaminants
Data Source
AI summary
A portable oxygen concentrator designed for medical use where the adsorbent beds, are designed to be replaced by a patient. The concentrator is designed so that the power supply and adsorbent bed mount is one module and the compressor and air filter are part of another module configured to provide a unitary cooling and air supply system. Replacement beds may be installed easily by patients, and all gas seals will function properly after installation.