Mechanical Airflow Detection via Gas Jet Deflection
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Solution Overview
Problem
Existing devices for detecting airflow, such as Continuous Positive Airway Pressure (CPAP) and Bi-level Positive Airway Pressure devices, face challenges in portability and power management, and struggle to accurately detect gas flow rates in conduits with low impedance, making them inefficient for mobile patients and non-medical applications.
Innovation Solution
A device that uses a gas jet to detect airflow by deflecting it across a conduit, employing pressure sensors to differentiate between flow and no-flow conditions, allowing for the modulation of airway pressure to assist inhalation and exhalation, and incorporating a mechanical subsystem to detect breathing patterns for bi-level pressure adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical transducers and electronic circuits are used to detect airflow and modulate pressure, then bi-level positive airway pressure delivery is achieved, but device portability and power management become difficult
Solution Approach 1:
The patent replaces electrical transducers and electronic circuits with a purely mechanical detection system. A jet of gas is directed across the airway passage, and the patient's breathing flow deflects the jet. The deflected jet then actuates mechanical pressure-to-movement conversion devices (diaphragms) that mechanically control the positive airway pressure source, eliminating all electrical components and enabling portability.
Solution Approach 2:
The patent uses pneumatic principles throughout: a jet of gas is used to detect airflow by deflection, and pressure-to-movement conversion devices (diaphragms) convert gas pressure into mechanical motion to control the pressure source. This entirely pneumatic system replaces electrical systems, solving the portability problem while maintaining reliable airflow detection.
2Difficulty of detecting and measuring
If a gas jet is used to detect airflow by deflection, then airflow detection in low impedance conduits is achieved, but the device structure becomes more complex
Solution Approach 1:
The patent introduces a jet of gas as an intermediary medium between the patient's breathing flow and the detection mechanism. The patient's flow deflects the jet, and the jet's deflection position actuates the pressure-to-movement conversion devices. This intermediary approach enables detection in low impedance conduits where direct measurement would be difficult.
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 solution enables accurate detection of airflow and pressure modulation, improving exhalation assistance for patients with poor lung capacity, enhancing portability, and facilitating gas flow detection in conduits, thus addressing the limitations of existing technologies.
Implementation Method 1
a jet of gas is directed across the conduit. A port is interfaced to a distal side of the conduit for receiving the jet of gas... In presence of the flow within the conduit, the gas jet is deflected away from the port
Data Source
AI summary
A device for detecting a flow of a first gas in a conduit includes a gas jet interfaced to a side of the conduit. The gas jet emits a jet of gas aimed across the conduit. A fluid port is interfaced to a distal side of the conduit for receiving the jet of gas and a pressure-detecting device is interfaced to the fluid port. In absence of the flow of the first gas within the conduit, the gas jet enters the fluid port and the pressure-detecting device reports a first pressure. In presence of the flow of the gas within the conduit, the gas jet is deflected away from the main port by the flow of the first gas and the pressure-detecting device reports a second pressure, the second pressure being lower than the first pressure.