Respiratory Therapy Power Control for Interleaved Heater Loads
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Solution Overview
Problem
Respiratory treatment devices for conditions like obstructive sleep apnea and sleep disordered breathing face challenges in power management, leading to inefficiencies and increased energy consumption due to simultaneous peak power operations of flow generators and accessory components like heaters and humidifiers.
Innovation Solution
A controller is integrated with the respiratory treatment apparatus to manage power by offsetting peak operations of the flow generator and accessory components, such as heaters, during the inspiratory phase, and interleaving their operations using pulse width modulated signals, prioritizing the flow generator over accessory devices to avoid simultaneous peak power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flow generator and accessory components (heaters, humidifiers) operate simultaneously at peak power, then patient comfort and treatment effectiveness are improved, but energy consumption increases and battery life decreases
Solution Approach 1:
The controller implements periodic action by cycling the operation of accessory components (heaters, humidifiers) on and off during the respiratory cycle. Specifically, accessory components are deactivated during inspiratory phase when the flow generator operates at peak power, and activated during expiratory phase when power demands are lower. This periodic switching pattern reduces overall energy consumption while maintaining treatment effectiveness through coordinated operation cycles.
Solution Approach 2:
The system applies preliminary action by pre-heating or pre-humidifying the breathable gas during expiratory phase before the inspiratory phase begins. This allows the gas to be conditioned in advance, reducing the need for high-power operation during the critical inspiratory delivery phase, thereby lowering peak power demands and overall energy consumption.
2Reliability
If accessory components are operated continuously to maintain patient comfort, then treatment quality is improved, but power supply demands increase beyond available battery capacity
Solution Approach 1:
The controller uses periodic action to switch accessory components between active and inactive states based on the respiratory cycle phase. During inspiratory phase when power is critical, heaters and humidifiers are turned off. During expiratory phase when power availability is sufficient, these components are activated to maintain patient comfort. This periodic switching ensures power supply demands remain within battery capacity while preserving comfort during appropriate cycles.
Solution Approach 2:
The system applies dynamics by making the operation of accessory components variable rather than continuous. The controller dynamically adjusts the operational state of heaters and humidifiers based on real-time detection of respiratory cycle phase and available power levels. This dynamic control allows the system to adapt power distribution to match actual treatment needs and power availability, preventing demands that exceed battery capacity.
3Reliability
If the flow generator operates at high power to deliver required breaths, then treatment efficacy is maintained, but simultaneous operation of heaters and humidifiers causes power overload
Solution Approach 1:
The controller implements periodic action by synchronizing the operation of accessory components with the respiratory cycle detected by the flow generator. During high-power inspiratory delivery, heaters and humidifiers are deactivated to prevent power overload. During lower-power expiratory phases, these components are activated. This periodic coordination simplifies power management by creating predictable, cyclical power demand patterns that avoid overload while maintaining treatment efficacy.
Solution Approach 2:
The system uses feedback by continuously monitoring the respiratory cycle phase and power consumption levels. The controller detects when the flow generator is operating at peak power during inspiration and automatically adjusts accessory component operation accordingly. This feedback mechanism simplifies power management by eliminating the need for complex predictive algorithms, relying instead on real-time detection and response to actual system state.
Data Source
AI summary
A respiratory treatment apparatus provides respiratory treatment with improved power management control to permit more efficient power consumption and power supply units, such as battery powered operation. In one embodiment, power management prioritizes the flow generator (104) over other accessories such as the heating elements (111, 135) of a humidifier (112) and/or a delivery tube. The flow generator may control operations of the heating elements as a function of a detected respiratory cycle. For example, the timing of operation of the heating elements may be interleaved with the portion of an inspiratory phase of the respiratory cycle to permit the flow generator to operate during a peak power operation without a power drain or with a lower power drain from these components. Operations of distinct sets of components of the system (e.g., different heating elements) may also be interleaved to prevent simultaneous peak power operations.