Rotatable Heat-Moisture Exchanger with Aerosol Bypass
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Solution Overview
Problem
Existing heat-moisture exchangers attached to ventilator circuits are complex and expensive, requiring a simpler and less costly solution to maintain continuity without interrupting ventilation when administering aerosolized medication.
Innovation Solution
A heat-moisture exchanger device with a rotatable central element and filter, allowing medicament to pass through without internal filters and maintaining circuit continuity by aligning passageways for smooth medication delivery and switching to filter mode as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heat-moisture exchanger with internal filters is used to maintain circuit continuity, then ventilation continuity is maintained, but device complexity and manufacturing cost increase
Solution Approach 1:
The device is divided into separate functional modules: a housing containing the HME material, a rotatable central element with filter, and a bypass conduit system. This segmentation allows the medication delivery function to be separated from the filtration function, enabling simple alignment-based operation while maintaining circuit continuity reliability
Solution Approach 2:
The rotatable central element provides dynamic reconfiguration of the fluid path. By rotating between aligned and misaligned positions, the system dynamically switches between medication delivery mode (bypassing filter) and filtration mode, reducing overall device complexity while maintaining ventilation continuity
2Object-affected harmful factors
If internal filters are mounted in the heat-moisture exchanger, then medication can be filtered, but medication flow is obstructed and device cost increases
Solution Approach 1:
The bypass conduit acts as an intermediary path that allows medication to flow directly from the first conduit to the second conduit without passing through the filter or HME material. This separate intermediary channel eliminates flow obstruction while maintaining the filtration capability when needed
Solution Approach 2:
The rotatable central element dynamically controls whether medication passes through the filter or bypasses it. When aligned, the bypass path is open allowing unobstructed flow; when misaligned, filtration occurs. This dynamic switching resolves the contradiction between filtration and flow efficiency
3Productivity
If the heat-moisture exchanger is designed with aligned passageways for smooth medication flow, then medication delivery efficiency improves, but the ability to filter medication is reduced
Solution Approach 1:
The device achieves multi-functionality through the rotatable central element mechanism. The same aligned passageway structure serves dual purposes: when rotated to align, it enables efficient medication delivery; when rotated to misalign, it enables filtration. This universal design resolves the contradiction between delivery efficiency and filtration capability
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 cost-effective maintenance of a closed ventilator circuit without interrupting ventilation, allowing medication to bypass obstructions and ensuring smooth fluid flow through aligned passageways while capturing heat and moisture when desired.
Implementation Method 1
A heat-moisture exchanger ('HME') attachable to a patient ventilation system... the chamber (18) configured to hold a rotatable central element (14)... the heat-moisture exchange material ('HMEM')...
Implementation Method 2
In the first position, medication can be supplied to the patient ventilation circuit without requiring the medication to pass through turns or past obstructions such as fan blades and the like. Instead, the medication can pass smoothly through the first, second and third passageways when the passageways are aligned.
Data Source
AI summary
A heat-moisture exchanger device for use with a patient ventilator circuit is provided. A rotatable central element is positioned in a housing, and a filter is coupled to the rotatable central element. A first conduit can allow fluid to enter or exit a chamber of the housing and a second conduit on an opposed surface can allow fluid to enter or exit the chamber. A third conduit on the rotatable central element can selectively place the first conduit in sealed fluid communication with the second conduit when the rotatable central element is in a first position. Alternatively, the rotatable central element can be rotated to a second position in which the third conduit does not place the first conduit in sealed fluid communication with the second conduit, and any fluid flowing through the chamber must pass through the filter.