Portable Oxygen Concentrator Adaptive Titration Control
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Solution Overview
Problem
Current portable oxygen concentrators for ambulatory patients often require fixed oxygen flow prescriptions, which do not account for varying conditions such as rest, walking, or high altitude, leading to inefficient oxygen delivery and reduced battery life.
Innovation Solution
A semi-automated titration system that uses a combination of continuous flow and pulse flow modes, with sensors to determine Individualized Pulse Dose Equivalent (IPDE) settings, optimizing oxygen delivery based on patient conditions and environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed prescription oxygen delivery is used, then device complexity is reduced, but adaptability to different conditions deteriorates
Solution Approach 1:
The patent implements dynamic oxygen delivery by transitioning from fixed prescription to adaptive flow rates. The system continuously monitors patient conditions (activity level, SpO2, respiratory rate) and automatically adjusts oxygen flow between standby, low, medium, and high modes, making the device responsive to changing physiological and environmental conditions.
Solution Approach 2:
The system employs multiple feedback mechanisms including SpO2 monitoring, activity detection, and respiratory rate sensing. This feedback loop enables the control system to assess patient oxygenation status and environmental factors, then adjust oxygen delivery accordingly, achieving high adaptability through closed-loop control.
2Reliability
If continuous flow mode is used, then oxygen delivery reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic oxygen delivery through pulse flow mode, where oxygen is delivered in synchronized bursts with patient breathing cycles rather than continuously. The system detects breath initiation and delivers oxygen pulses, reducing overall energy consumption while maintaining adequate oxygenation through timing-aligned delivery.
Solution Approach 2:
The system dynamically switches between continuous flow mode (for reliability during severe hypoxemia or high activity) and pulse flow mode (for energy conservation during stable conditions). This dynamic mode selection optimizes the balance between oxygen delivery reliability and energy consumption based on real-time patient needs.
3Adaptability or versatility
If adaptive oxygen delivery is implemented, then adaptability improves, but device complexity increases
Solution Approach 1:
The patent segments the adaptive control into distinct operational modes (standby, low, medium, high flow rates) and separate sensing functions (activity detection, SpO2 monitoring, respiratory rate sensing). This modular segmentation manages complexity by organizing adaptive features into discrete, manageable components rather than a monolithic control system.
Solution Approach 2:
The system employs multi-functional sensors and control algorithms that serve multiple purposes. For example, the same sensor suite monitors both activity level and respiratory rate, and the control system integrates multiple parameters to determine oxygen delivery mode, reducing overall device complexity through functional consolidation.
4Use of energy by moving object
If pulse flow mode is used, then energy consumption is reduced, but oxygen delivery reliability may deteriorate
Solution Approach 1:
The system continuously monitors SpO2 levels and other physiological parameters to verify adequate oxygenation during pulse flow mode. If hypoxemia is detected or patient condition deteriorates, the feedback loop automatically transitions to continuous flow mode, ensuring reliability is maintained even when operating in energy-saving pulse mode.
Solution Approach 2:
Pulse flow delivers oxygen in synchronized bursts with patient breathing, ensuring efficient oxygen transfer during each breath. This periodic delivery timed with respiratory cycles maintains adequate oxygenation while reducing total energy consumption compared to continuous flow, achieving both reliability and energy efficiency.
Data Source
AI summary
A method of titration using a combination continuous flow and pulse flow portable oxygen concentration system (system) with a patient includes: a) providing the system in a continuous flow mode and titrating the patient to a predetermined blood oxygen saturation using the system at one or more predetermined conditions in the continuous flow mode; b) providing the system in a pulse flow mode and titrating the patient to the same predetermined blood oxygen saturation as step a using the system at the same one or more predetermined conditions as in step a in the pulse flow mode; c) determining an Individualized Pulse Dose Equivalent (IPDE) correlation based on data obtained from steps a and b; d) providing the system with the IPDE correlation; and e) using the IPDE correlation to operate the concentrator in a more efficient manner.