Dual Pressure Sensor CPAP Controller for Breathing Phase Detection
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Solution Overview
Problem
Current CPAP systems cause discomfort due to excessive pressure during the expiratory phase, as they often apply constant positive airway pressure regardless of the breathing cycle, leading to resistance and discomfort for patients with obstructive sleep apnea.
Innovation Solution
A respiratory assistance device utilizing dual pressure sensors at the blower output and on the ventilation mask to detect inspiratory and expiratory phases, regulating therapeutic airflow and relieving mask pressure through a piloted exhalation valve, thereby adjusting pressure accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant positive airway pressure is applied throughout the breathing cycle, then airway splinting during inspiration is ensured, but patient discomfort increases due to excessive pressure during expiration
Solution Approach 1:
The system dynamically adjusts the positive airway pressure level based on the detected breathing phase. During inspiration, full CPAP pressure is maintained to ensure airway splinting. During expiration, the system automatically reduces pressure to a lower level, eliminating the discomfort caused by excessive pressure during the expiratory phase while maintaining airway patency when needed.
Solution Approach 2:
The system implements periodic modulation of pressure levels synchronized with the patient's breathing cycle. By detecting alternating inspiratory and expiratory phases, the system applies high pressure during inspiration and low pressure during expiration in a rhythmic pattern, thereby maintaining therapeutic effectiveness while minimizing discomfort throughout the breathing cycle.
2Reliability
If pressure augmentation is applied during inspiration, then airway patency is maintained, but pressure relief during expiration is insufficient causing discomfort
Solution Approach 1:
The system dynamically switches between two pressure levels based on real-time detection of breathing phase. During inspiration, full pressure augmentation is applied to maintain airway patency. During expiration, the system dynamically reduces pressure augmentation to provide relief, thereby improving breathing comfort while maintaining airway patency when required.
Solution Approach 2:
The system uses feedback from the breathing phase detection mechanism to automatically adjust pressure levels. When expiration is detected, the feedback signal triggers pressure reduction; when inspiration is detected, full pressure is restored. This closed-loop feedback ensures both airway patency and breathing comfort are optimized throughout the breathing cycle.
3Measurement precision
If dual pressure sensors and piloted exhalation valve are added, then pressure control precision is improved, but device complexity increases
Solution Approach 1:
The piloted exhalation valve acts as an intermediary component that uses pressure differential signals from the two sensors to自动控制 airflow. Instead of requiring a complex active control system, the valve passively responds to pressure differences between the patient circuit and ambient environment, thereby achieving precise pressure control with minimal additional complexity.
Solution Approach 2:
The system employs pneumatic principles by using the pressure differential between the patient circuit and ambient environment to drive the exhalation valve. This passive pneumatic control mechanism eliminates the need for complex electronic actuators or motors, achieving precise pressure regulation while minimizing added device complexity through elegant use of fluid mechanics.
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
This solution reduces patient discomfort by providing pressure relief during exhalation, optimizing comfort and ensuring proper airway splinting during inspiration, thus improving the effectiveness of CPAP therapy.
Implementation Method 1
a first pressure sensor that can measure a blower pressure at the output of the blower
Implementation Method 2
a second pressure sensor that can measure a mask pressure in the patient ventilation interface
Implementation Method 3
regulate therapeutic airflow delivered to the patient based upon pressure differentials between the mask pressure and the blower pressure
Implementation Method 4
relieve mask pressure by reducing therapeutic airflow delivered to the patient according to a function of the blower pressure
Data Source
AI summary
A continuous positive airway pressure (CPAP) apparatus for respiratory assistance of a pattern is disclosed. There is a blower having an output connectible to a ventilation mask wearable by the patient. A first pressure sensor measures blower pressure at the output of the blower, and a second pressure sensor that is connectible to the ventilation mask measures mask pressure therein. A pressure controller is connected to the first pressure sensor and the second pressure sensor, and a patient inspiratory phase and a patient expiratory phase is be detectable by the pressure controller to regulate therapeutic pressure at the patient mask, based upon pressure differentials between the mask pressure and the blower pressure.