Self-venting cannula filter prevents aerosol contamination
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Solution Overview
Problem
Existing vented cannula assemblies fail to prevent the expulsion of aerosolized contaminants and ambient air contamination during the transfer of medicinal fluids, posing risks to medical professionals.
Innovation Solution
A self-venting cannula assembly with a filter element positioned over a vent aperture, which filters particles larger than 0.2 microns, preventing their passage and maintaining a sterile environment by regulating air pressure within sealed vials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a vented cannula assembly is used to transfer medicinal fluids between vials, then air pressure equilibrium is maintained and fluid transfer is enabled, but aerosolized contaminants are expelled into the surrounding air and ambient air contaminates the medicinal solution
Solution Approach 1:
A filter element is introduced as an intermediary component between the vent channel and the external environment. This filter selectively allows air molecules to pass through while blocking aerosolized contaminant particles, thereby mediating the interaction between the pressurized air inside the vial and the external atmosphere during fluid transfer operations
Solution Approach 2:
The filter element utilizes porous material structure with controlled pore sizes that permit gas molecules to diffuse through while physically blocking larger aerosolized particles. The porous structure enables air pressure equilibrium to be maintained while preventing contaminant expulsion to the surrounding environment
2Ease of operation
If a vented cannula assembly is used to transfer medicinal fluids between vials, then air pressure equilibrium is maintained and fluid transfer is enabled, but ambient air contaminates the medicinal solution
Solution Approach 1:
The filter element serves as a protective intermediary that interfaces between the external ambient air and the sterile medicinal solution. It allows necessary air exchange for pressure equilibrium while blocking ambient air contaminants from entering and contaminating the medicinal solution
Solution Approach 2:
The porous filter structure provides a selective barrier that permits air molecules to pass through for pressure equalization while blocking larger ambient air particles and contaminants, thereby maintaining the sterility and reliability of the medicinal solution during transfer operations
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 traps aerosolized contaminants and ambient air particles, ensuring user safety and maintaining the sterility of medicinal solutions during reconstitution and transfer processes.
Implementation Method 1
The filter element is positioned over the vent aperture and prevents particles having a dimension greater than about 0.2 microns from passing therethrough
Data Source
AI summary
The present disclosure relates to a self-venting cannula assembly. The self-venting cannula assembly including an outer tube that defines a throughbore, an inner tube, a vent aperture, and a filter element. The inner tube is positioned within the outer tube, which defines a vent channel therebetween. The vent aperture is formed in the outer tube to provide fluid communication between the vent channel and an external environment. The filter element is positioned over the vent aperture and prevents particles having a dimension greater than about 0.2 microns from passing therethrough.