Sleep-Stage Pressure Control in Respiratory Therapy
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Solution Overview
Problem
Existing respiratory treatment systems for disorders like sleep apnea disrupt sleep quality due to inappropriate air pressure settings during different sleep stages, leading to frequent awakenings and discomfort.
Innovation Solution
A system that adjusts air pressure settings based on detected sleep stages using sensors to tailor therapy, optimizing pressure ranges and rates of change to minimize disturbances and improve sleep quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed air pressure settings are used throughout the night, then treatment simplicity is maintained, but sleep quality deteriorates due to inappropriate pressure during different sleep stages
Solution Approach 1:
The system dynamically adjusts air pressure settings based on detected sleep stages (REM, NREM, light sleep) rather than using fixed pressure. The controller automatically modifies pressure parameters including maximum pressure, minimum pressure, and rate of change according to the current sleep stage, resolving the contradiction between operational simplicity and treatment effectiveness.
Solution Approach 2:
The system incorporates sensors that continuously monitor sleep stage and provide feedback to the controller. This closed-loop feedback mechanism enables automatic pressure adjustment without user intervention, maintaining treatment simplicity while improving sleep quality through stage-appropriate pressure delivery.
2Reliability
If high air pressure is applied to treat sleep apnea, then respiratory events are effectively prevented, but sleep continuity deteriorates causing frequent awakenings
Solution Approach 1:
The system applies different pressure characteristics to different sleep stages. During REM sleep, it uses lower maximum pressure and slower rate of change, while during NREM sleep, it can apply higher pressure more quickly. This localized adaptation of pressure quality to specific sleep stages prevents respiratory events while minimizing sleep disruptions.
Solution Approach 2:
The system changes multiple pressure parameters including maximum pressure, minimum pressure, and rate of change based on sleep stage detection. These parameter adjustments ensure effective treatment of respiratory events while adapting to the physiological characteristics of different sleep stages, thereby maintaining sleep continuity.
3Speed
If rapid pressure changes are applied to respond to breathing events, then respiratory response time is improved, but comfort deteriorates causing sleep disturbances
Solution Approach 1:
The system dynamically adjusts the rate of pressure change based on sleep stage. During light sleep, it allows faster pressure changes to respond quickly to breathing events, while during deep sleep, it uses slower rate of change to maintain comfort. This dynamic adaptation resolves the contradiction between response speed and comfort.
Solution Approach 2:
The system applies pressure changes in a periodic manner that adapts to the sleep cycle. By monitoring sleep stage transitions and adjusting pressure delivery patterns accordingly, it achieves appropriate response speed during lighter sleep while minimizing disturbances during deeper sleep stages.
Data Source
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AI summary
A system includes a respiratory device, a mask, a sensor, and a control system. The respiratory device is configured to supply pressurized air. The mask is coupled to the respiratory device and configured to engage a user during a sleep session to aid in directing the supplied pressurized air to the user. The sensor is configured to generate physiological data associated with the user. The control system is configured to analyze the physiological data to determine a first sleep stage of the user, and based on the determined first sleep stage of the user, (i) set a range of pressures for the respiratory device to supply the pressurized air, and (ii) set a rate of change of the pressurized air for the respiratory device to use when changing the supplied pressurized air from a first pressure within the range of pressures to a second pressure within the range of pressures.