Bubble CPAP Flow Generator With Closed-Loop Pressure Control
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Solution Overview
Problem
In certain locations, such as developing countries or remote areas, the availability of a wall source for bubble CPAP therapy is limited, necessitating an alternative solution for providing continuous positive airway pressure therapy.
Innovation Solution
A flow generator system with an integrated humidifier and optional supplementary gas blender is used to deliver bubble CPAP therapy, capable of operating in various modes, including high flow therapy, using ambient air and controlling motor speed to maintain a constant flow rate and pressure, with integrated sensors for monitoring and alarm functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wall source is used for bubble CPAP therapy, then reliable gas supply is ensured, but the device cannot be used in locations without wall source availability
Solution Approach 1:
The respiratory device is designed to function as a standalone bubble CPAP system with an integrated flow generator that can operate independently of wall source infrastructure. The device incorporates a blender that can mix ambient air with supplementary oxygen or other gases, enabling it to provide therapeutic gas flows in locations without wall source availability while maintaining reliable pressure delivery through the water column pressure regulator
2Reliability
If multiple separate devices are used (flow generator, humidifier, blender), then each function can be optimized, but device complexity increases
Solution Approach 1:
The patent integrates the flow generator, humidifier, and gas blender into a single unified respiratory device. The flow generator delivers pressurized gas flow that passes through the humidifier for moisture addition, while the blender combines ambient air with supplementary gases. This consolidation maintains the functional reliability of each component while reducing system complexity and eliminating the need for multiple separate devices
3Stability of the object's composition
If motor speed is controlled to maintain constant flow rate, then consistent gas delivery is achieved, but response time to pressure changes may be delayed
Solution Approach 1:
The device incorporates pressure sensors that continuously monitor the pressure delivered to the patient and provide feedback to the control system. The microprocessor compares the measured pressure against target pressure values and adjusts the motor speed of the flow generator in real-time to maintain the desired flow rate while responding quickly to pressure changes. This closed-loop feedback control ensures both flow consistency and rapid response to patient needs
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 system provides reliable bubble CPAP therapy without a wall source, ensuring consistent gas delivery, reducing the need for multiple devices, and allowing easy transition between therapy modes, while maintaining patient safety and comfort.
Implementation Method 1
a blower configured to generate a flow of gas to the patient
Implementation Method 2
The pressure regulator may be a chamber with a column of water into which an end portion of the expiratory conduit is submerged
Implementation Method 3
An example of a flow generator with an integrated humidifier is a high flow respiratory apparatus
Data Source
AI summary
Respiratory systems with a flow generator can provide bubble CPAP therapy by controlling the pressure of a flow of gas delivered to a patient. The controller of the respiratory system can control a motor speed of its flow generator so as to control the pressure of the flow of gas. The controller can also detect presence of bubbling and/or possible leaks in the gas pathway of the system. The respiratory system can include a high flow respiratory system.