Respiratory Flow Control Device for Varying Gas Rates
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Solution Overview
Problem
Current respiratory therapy systems lack the ability to effectively vary breathing gas flow rates in response to patient needs, which can limit optimal airway pressure and alveolar ventilation.
Innovation Solution
A system that includes a source of breathing gas, a patient interface such as a nasal cannula, and a flow control device capable of automatically varying the flow rate between a predetermined maximum and minimum rate, slower than the patient's breathing rate, to change functional residual capacity and improve alveolar ventilation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional nasal cannula is used to deliver breathing gas, then the patient receives a steady flow of gas, but the system cannot adapt to varying patient needs or optimize airway pressure and alveolar ventilation
Solution Approach 1:
The system dynamically adjusts the flow rate of breathing gas by varying it between a maximum and minimum rate at a frequency slower than the patient's breathing rate. This dynamic adjustment optimizes airway pressure and alveolar ventilation while adapting to patient needs without requiring complex intervention systems.
Solution Approach 2:
The flow control device implements periodic variation of the breathing gas flow rate, cycling between maximum and minimum rates at a frequency below the patient's respiratory frequency. This periodic action creates the desired physiological effects on airway pressure and ventilation while maintaining system simplicity.
2Reliability
If the flow rate is kept constant to simplify the system, then the device complexity is reduced, but the ability to improve airway pressure and alveolar ventilation is limited
Solution Approach 1:
The system achieves reliable and effective gas delivery through dynamic flow rate adjustment between maximum and minimum rates. This dynamic operation, controlled at a frequency slower than patient breathing, reliably improves airway pressure and alveolar ventilation without requiring complex control mechanisms.
Solution Approach 2:
The flow control device changes the flow rate parameter of the breathing gas, varying it between predetermined maximum and minimum rates. This parameter change approach effectively improves gas delivery reliability while maintaining relatively simple system architecture.
3Speed
If the flow rate varies rapidly to respond quickly to patient needs, then the responsiveness is improved, but the system may interfere with the patient's natural breathing rhythm
Solution Approach 1:
The system uses periodic variation of flow rate at a frequency specifically chosen to be slower than the patient's breathing rate. This timing strategy allows the system to respond to patient needs while avoiding interference with the natural breathing rhythm, maintaining stability in the breathing pattern.
Solution Approach 2:
The dynamic adjustment of flow rate is performed at a controlled speed that balances responsiveness with breathing rhythm stability. By varying the flow rate at a frequency below the patient's respiratory frequency, the system maintains stability in the overall breathing pattern while still achieving effective airway pressure optimization.
Data Source
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AI summary
Systems and methods for providing respiratory therapy with varying flow rates are disclosed. A system comprises a source of breathing gas, a patient interface, and a flow control device. The flow control device is configured to automatically change a rate of the flow of breathing gas. The flow control device may vary the rate of the flow of breathing gas at a frequency slower than a frequency of breathing of the patient. A method comprises coupling a patient interface to the patient, providing the flow of breathing gas to an inlet port of the patient interface, and automatically changing a rate of the flow of breathing gas with a flow control device in communication with the flow of breathing gas. The method may also comprise varying the rate of the flow of breathing gas at a frequency slower than a frequency of breathing of the patient.