Exhalation Valve Diaphragm Pressure Control
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Solution Overview
Problem
Conventional respiratory assistance devices have a response time issue due to the pathway leading from the pump unit to the back chamber, which affects the accuracy and speed of exhalation valve control, particularly in critical medical situations.
Innovation Solution
An exhalation valve with a diaphragm that uses air pressure differences between the exhalation flow path and a back chamber, controlled by a pump unit and a control unit that includes air feeding and discharging micro pumps, and pressure gauges to maintain a near-zero pressure difference, allowing precise control of the valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a pump unit with a pathway to the back chamber is used, then air pressure can be adjusted in the back chamber, but response time is delayed due to the pathway length
Solution Approach 1:
The pump unit is integrated directly with the back chamber, eliminating the separate pathway. The pump unit becomes part of the back chamber structure, allowing immediate pressure adjustment without transmission delay through a separate channel.
Solution Approach 2:
The pathway connecting the pump unit to the back chamber is removed entirely. By extracting this intermediate component, the system achieves direct coupling between the pump and chamber, eliminating the time delay associated with pressure transmission through a pathway.
2Speed
If the diaphragm responds instantaneously to pressure changes, then exhaled air is released quickly, but excessive air pressure buildup occurs during coughing or sneezing
Solution Approach 1:
The control unit continuously monitors the air pressure in the back chamber and adjusts the pump unit's operation accordingly. When pressure exceeds a predetermined threshold during events like coughing or sneezing, the control unit regulates the pump to discharge excess air, preventing dangerous pressure buildup while maintaining rapid response capability.
3Strength
If a box-shaped casing accommodating the pump unit is used, then the pump unit is protected, but the device size increases and must be installed beside the user
Solution Approach 1:
The pump unit is integrated directly into the back chamber structure, eliminating the need for a separate box-shaped casing. This merging of components reduces the overall device volume while maintaining protection through the unified structural design.
Solution Approach 2:
The back chamber structure serves multiple functions: it contains the working fluid, provides structural support, and integrates the pump unit housing. This multi-functionality eliminates the need for separate protective casings, reducing overall device size.
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
Enables accurate and rapid control of the exhalation valve, improving safety and responsiveness in medical applications by minimizing the time required for the pump unit to act on the back chamber, thus preventing excessive air pressure buildup during patient coughing or sneezing.
Implementation Method 1
the diaphragm uses a difference between an air pressure inside the exhalation flow path and an air pressure inside the back chamber to close the outlet when the air pressure inside the exhalation flow path is lower than the air pressure inside the back chamber, and to open the outlet when the air pressure inside the exhalation flow path is higher than the air pressure inside the back chamber
Data Source
AI summary
Exhalation valve including a diaphragm for opening and closing an outlet of an exhalation flow path for guiding exhaled air to the outside air, a back chamber provided opposite the exhalation flow path in the diaphragm and forming a space together with the diaphragm, and a pump unit fixed to the circumference of the back chamber for adjusting the air pressure inside the back chamber by feeding and discharging of air to and from the back chamber. The diaphragm closes the outlet of the exhalation flow path when the air pressure inside the exhalation flow path is lower than the air pressure inside the back chamber, and opens the outlet of the exhalation flow path when the air pressure inside the exhalation flow path is higher than the air pressure inside the back chamber.