Ventilator Pressure Line Purging via Blower and Valve Control
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Solution Overview
Problem
Conventional purging systems for mechanical ventilators are bulky, complex, and expensive due to the need for a separate compressor or secondary source of pressurized gas to clear obstructions from pressure lines, leading to erroneous airway pressure readings and potential interference with ventilator operation.
Innovation Solution
A secondary line purging system utilizing a blower with a motor-connected fan, pressure sensors, and a valve system controlled by a controller to switch between isolation and purging modes based on pressure differences, allowing pressurized gas to clear obstructions within the pressure lines without additional gas sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate compressor or secondary source of pressurized gas is used to purge the pressure line, then the pressure line can be effectively purged of obstructions, but the system becomes bulky, complicated, and expensive
Solution Approach 1:
The patent combines the purging function with the existing blower by adding a valve system that redirects the blower's output. Instead of using a separate compressor, the blower serves dual purposes: delivering breathable gas to the patient and providing pressurized gas for purging the pressure line when the valve is in the second position. This merging eliminates the need for additional compressors and reduces system complexity.
Solution Approach 2:
The blower is designed to perform multiple functions: it delivers breathable gas to the patient during normal operation and serves as the pressurized gas source for purging the pressure line when needed. The valve system enables the blower to switch between these functions, making the blower a universal component that eliminates the need for dedicated purging equipment.
2Measurement precision
If pressure measurements are used to control ventilator parameters, then accurate ventilation control is achieved, but the pressure line becomes vulnerable to obstruction from fluid
Solution Approach 1:
The system performs preliminary purging action by continuously or periodically clearing the pressure line before obstructions can accumulate to problematic levels. The valve system can be configured to purge the pressure line proactively, ensuring that fluid does not have time to obstruct the line and compromise pressure measurements, thus maintaining measurement precision.
Solution Approach 2:
The system uses feedback from pressure sensors to detect when the pressure line may be obstructed and triggers purging action accordingly. When pressure readings indicate an obstruction (such as a sudden pressure change or deviation from expected values), the controller activates the valve to purge the line, restoring accurate pressure measurements and maintaining the reliability of ventilation control.
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
Effectively clears obstructions from pressure lines, preventing erroneous readings and ventilator interference, while reducing system complexity and cost by eliminating the need for a secondary compressor or gas source.
Implementation Method 1
a blower configured to pressurize a flow of gas for delivery to a subject. The blower includes a motor connected to a fan
Implementation Method 2
a first pressure sensor configured to measure a first pressure of the flow of gas at or near the blower and a second pressure sensor configured to measure a second pressure of the flow of gas within the secondary line
Implementation Method 3
A valve system is configured to be operable in 1) a first mode of operation to isolate the blower from the secondary line and 2) a second mode of operation to permit fluid communication between the blower to the secondary line
Data Source
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AI summary
A secondary line purging system (40) having a blower (22) for pressurizing a flow of gas and a first pressure sensor (28) for measuring a first pressure of the flow of gas at or near the blower. The system also includes a secondary line (36) communicating with the blower and a subject circuit (32). The system further includes a second pressure sensor (30) for measuring a second pressure of the flow of gas within the secondary line. A valve system (42) is operable in 1) a first mode of operation to isolate the blower from the secondary line and 2) a second mode of operation to permit communication between the blower to the secondary line to purge the secondary line of obstructions with the pressurized flow of gas. A controller (16) switches operation of the valve system between the first mode of operation and the second mode of operation, based on the first pressure and the second pressure.