HME Gas-Treatment Device With Integrated Bypass Shutter
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Solution Overview
Problem
Existing gas-treatment devices, such as heat and moisture exchange (HME) systems, require disconnection and reconnection during nebulized drug administration, causing inconvenience and potential harm to patients due to their bulkiness and inefficiency in allowing gas to bypass the treatment element.
Innovation Solution
A gas-treatment device with a manually-displaceable member that switches between directing gas flow through a HME element and a by-pass passage, allowing for seamless diversion of gas flow without disconnecting the device, using a pivoted shutter or rotatable housing parts to control the flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a by-pass system is added to allow gas flow around the HME during drug administration, then drug delivery capability is improved, but device complexity and bulkiness increase
Solution Approach 1:
The patent merges the by-pass function directly into the HME housing structure by forming a by-pass passage through the housing walls, rather than adding a separate by-pass system. This integration allows drug delivery capability while avoiding additional external components, thereby improving adaptability without proportionally increasing device complexity
Solution Approach 2:
The housing structure serves multiple functions: it contains the HME element, provides structural support, and simultaneously forms the by-pass passage through its walls. This multi-functionality allows the same structure to enable both normal HME operation and drug delivery by-pass, improving versatility without linearly increasing complexity
2Adaptability or versatility
If the HME is disconnected and reconnected during drug administration, then drug delivery is enabled, but ventilation interruption and clinical time increase
Solution Approach 1:
The by-pass passage is pre-formed as an integral part of the housing structure, ready for immediate use when drug administration is required. This preliminary preparation eliminates the need for disconnection and reconnection actions, allowing seamless switching between HME mode and by-pass mode, thereby preventing ventilation interruption and reducing clinical time
Solution Approach 2:
The device maintains continuous ventilation throughout operation by providing two continuous pathways: through the HME element during normal operation and through the by-pass passage during drug administration. This continuity eliminates interruptions in ventilation, ensuring uninterrupted useful action while enabling drug delivery
3Adaptability or versatility
If a by-pass system is added to allow gas flow around the HME, then drug delivery is improved, but device weight and dead space increase
Solution Approach 1:
The by-pass passage is merged into the existing housing structure, utilizing the housing walls and internal volume rather than adding separate by-pass tubing or components. This integration allows the device to enable drug delivery without proportionally increasing weight, as the by-pass function is achieved through the existing structural material
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 continuous ventilation during nebulized medication administration without the need to disconnect the HME, providing a compact and efficient solution that maintains patient ventilation and reduces clinical time and effort.
Implementation Method 1
When the patient exhales, gas passes through the exchange element and gives up a major part of its heat and moisture to the element. When the patient inhales, gas passes through the exchange element in the opposite direction and takes up a major part of the heat and moisture in the exchange element
Implementation Method 2
a manually-displaceable member that in a first position blocks the second gas-flow passage and reveals the first gas-flow passage so that all gas flow passes through the gas-treatment element and in a second position blocks the first gas-flow passage and opens the second gas-flow passage
Data Source
AI summary
An HME device has a housing (10) containing an HME element (25). The device has a first gas-flow passage through the device via the HME element (25) and a second gas-flow passage that by-passes the HME element. Flow is switched between the first or second flow passage by a pivoted shutter (30) that can be displaced by a rotatable knob (32).