Multilayer Medical Device Edge Encapsulation
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Solution Overview
Problem
Medical devices, such as tracheal tubes, are susceptible to microbial growth at edges exposed during machining, leading to biofilm formation and increased mucus buildup, which can cause clinical complications like Ventilator-Assisted Pneumonia, despite existing coatings that slow microbial growth on surfaces.
Innovation Solution
A medical device with a multilayer wall structure where a core layer is encapsulated by inner and outer layers along the edges, using a mold to form a cavity for the softer layers to flow into and harden, thereby sealing the core layer and preventing microbial growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the device is drilled, punched or cut after coating to achieve final shape, then manufacturing flexibility is improved, but the coating is removed at edges creating areas susceptible to microbial growth
Solution Approach 1:
The device is coated with hydrophilic and antimicrobial materials before being drilled, punched, or cut to final shape. This preliminary coating ensures that even though edges will be exposed during machining, the coating material is already in place and can be repositioned or replenished during the encapsulation process, preventing microbial growth susceptibility at edges
Solution Approach 2:
An encapsulating layer is formed over the edges of the device, creating a nested structure where the coating layers are positioned within cavities formed by molds. This encapsulating layer seals the edges and prevents direct exposure of uncoated surfaces, while the nested cavity structure allows the coating to conform to the edge geometry
2Shape
If edges are exposed during machining, then device shaping is achieved, but hydrophobic material re-exposure promotes microbial growth
Solution Approach 1:
The device structure is modified to include an encapsulating layer specifically at the edges, where the hydrophobic material is exposed during machining. This localized modification provides different properties at different locations: the bulk device maintains its original structure, while the edges gain enhanced protection against microbial growth through the encapsulating layer
Solution Approach 2:
An encapsulating layer acts as an intermediary structure between the hydrophobic core layer and the external environment. This intermediate layer, formed within cavities created by molds, prevents direct contact between microbes and the hydrophobic edge surfaces, thereby reducing biofilm formation while allowing the device to maintain its shaped geometry
3Reliability
If coating is applied before machining, then antimicrobial protection is provided, but edge areas remain susceptible due to coating removal
Solution Approach 1:
The hydrophilic and antimicrobial coating is applied to the device before machining operations. This preliminary coating provides baseline antimicrobial protection, and the coating material remains in place during drilling, punching, or cutting, ready to be repositioned or supplemented during the subsequent encapsulation process
Solution Approach 2:
The encapsulating layer is formed within cavities that are positioned over the edges of the device. This nested structure allows the encapsulating layer to conform to and seal the edge geometries, maintaining coating integrity at edges by creating a protective cavity structure that accommodates the coating 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
The encapsulation of the core layer along edges reduces microbial growth and mucus buildup, enhancing the device's resistance to microbial colonization and clinical complications.
Implementation Method 1
At least one of the inner and outer layers positioned within the mold is softened to flow into the cavity and form an encapsulating layer over the core layer
Data Source
AI summary
The present disclosure describes a medical which includes a body defining a conduit. The body includes a multilayer wall having at least one edge. The wall including a core layer positioned between an inner layer and an outer layer, wherein at least one of the inner and outer layers encapsulates the core layer along the edge.