Respiratory Flow Generator Sensor Integration for Pressure Control
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Solution Overview
Problem
Existing respiratory therapy systems face challenges in efficiently controlling and delivering breathable gases, particularly in maintaining accurate pressure and flow rate settings across varying operating conditions.
Innovation Solution
The integration of a sensor within the flow generator of a respiratory therapy system, which includes a housing with an inlet and outlet, an impeller driven by a motor, and a sensor mounted in the gas flow path to detect differential pressure, allowing for precise control of gas flow and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is integrated within the flow generator housing in the gas flow path, then measurement precision of gas flow properties is improved, but device complexity increases
Solution Approach 1:
The sensor is integrated within the flow generator housing, merging the sensing function with the gas generation function. This integration allows the flow generator to directly measure gas flow properties without requiring separate external sensing components, thereby improving measurement precision while managing device complexity through functional consolidation.
Solution Approach 2:
The flow generator is designed to perform multiple functions: generating breathable gas flow and simultaneously measuring gas flow properties through the integrated sensor. This multi-functionality reduces the need for separate dedicated measurement devices, improving overall system efficiency and measurement accuracy.
2Measurement precision
If the sensor is positioned to detect differential pressure in the gas flow path, then measurement precision of pressure is improved, but the sensor becomes more vulnerable to damage from gas flow conditions
Solution Approach 1:
The sensor detects differential pressure through an intermediary mechanism that allows pressure measurement while protecting the sensor from direct exposure to harsh gas flow conditions. The sensor is positioned to measure pressure differences in the gas flow path without requiring direct contact with the full force of the gas stream, thereby maintaining both measurement precision and sensor reliability.
3Ease of manufacture
If the flow generator is designed with integrated sensor mounting capabilities, then ease of manufacture is improved, but manufacturing precision requirements increase
Solution Approach 1:
The flow generator housing is designed with pre-integrated sensor mounting capabilities, including pre-formed mounting structures and pre-configured gas flow paths. This preliminary integration allows the sensor to be installed with minimal additional manufacturing steps, improving ease of manufacture while the pre-designed mounting structures ensure that manufacturing precision requirements are met through standardized interfaces and alignment features.
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 configuration enables improved control over the breathable gas flow, ensuring accurate delivery of selected pressure or flow rate settings, thereby enhancing the effectiveness and reliability of respiratory therapy systems.
Implementation Method 1
the sensor being configured to detect differential pressure in the gas flow path
Implementation Method 2
an impeller mounted within the housing for rotation about an axis, the impeller configured to be rotationally driven by a motor to provide a gas flow along the gas flow path
Data Source
AI summary
A flow generator 21 for a respiratory therapy system configured to deliver a breathable gas flow to a patient comprises a housing 27 comprising an inlet 28 and an outlet 25 and a gas flow path between the inlet 28 and outlet 25. An impeller is mounted within the housing 27 for rotation about an axis, the impeller configured to be rotationally driven by a motor to provide a gas flow along the gas flow path. Various embodiments are disclosed in which the flow generator 21 further comprises a sensor 23 mounted in the housing 27 in the gas flow path and configured to detect a property of the gas flow. The sensor 23 may be mounted in the outlet 25 so as to project into the gas flow path. Flow generator may comprise an axial inlet 28 and a tangential outlet 25. In another embodiment the sensor 23 may be mounted in the inlet 28.