ePTFE Sling Microporous Structure for Bacterial Resistance
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Solution Overview
Problem
Current polypropylene mesh slings used in pubovaginal procedures are prone to bacterial penetration, tissue damage, and degradation, leading to post-operative infections and complications such as scar tissue formation and migration, making them difficult to remove and potentially harmful.
Innovation Solution
A prosthetic medical sling made from expanded Polytetrafluoroethylene (ePTFE) with a node/fibril structure, which is biocompatible, resistant to bacterial invasion, and non-degradable, featuring a micro porous structure that prevents bacterial penetration and minimizes tissue damage, and can be processed to have densified ends for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polypropylene mesh slings are used to support the urethra, then surgical support and incontinence prevention are achieved, but bacterial penetration and tissue damage occur leading to infections and scar tissue formation
Solution Approach 1:
The patent employs expanded PTFE (ePTFE) material with a controlled microporous structure that provides mechanical support while preventing bacterial penetration. The porous structure allows tissue compliance and integration while the pore size and material properties prevent bacterial invasion, thus resolving the contradiction between providing surgical support and preventing bacterial/tissue damage.
Solution Approach 2:
The invention uses composite construction combining ePTFE material with specific structural configurations (tubular structures, mesh patterns, or solid forms) to achieve both support functionality and biocompatibility. The composite nature of the material and structure provides both the mechanical strength needed for support and the surface properties that prevent bacterial adhesion and tissue damage.
2Duration of action of stationary object
If polypropylene mesh slings are implanted for long-term support, then structural durability is achieved, but material degradation and migration occur making removal difficult
Solution Approach 1:
The ePTFE material's microporous structure provides long-term durability while preventing the degradation and migration issues associated with polypropylene mesh. The stable chemical structure of PTFE combined with the porous architecture allows the implant to maintain its properties over time without degrading or migrating, while still allowing for clean removal when needed.
Solution Approach 2:
The patent utilizes the unique thermal and mechanical parameters of PTFE material, including its melting point and expansion characteristics, to create an implant that maintains structural integrity long-term. The material parameters are selected to ensure durability while preventing the harmful degradation and migration effects seen with polypropylene.
3Duration of action of moving object
If nonabsorbable polypropylene mesh is used for sling construction, then long-term support is provided, but scar tissue formation and difficult removal occur
Solution Approach 1:
The ePTFE material with controlled porosity provides long-term support while minimizing scar tissue formation. The porous structure allows for controlled tissue interaction that prevents excessive fibrosis and scar formation, unlike the dense polypropylene mesh that causes significant scarring. The material maintains support durability while reducing harmful scar tissue responses.
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 ePTFE sling provides long-term strength and durability, reduces scar tissue formation, and facilitates easy surgical removal with minimal tissue damage, while maintaining tissue compliance and resistance to bacterial infection.
Implementation Method 1
expanding the PTFE tube in at least one dimension to create a node/fibril structure
Implementation Method 2
heating the PTFE tube to a temperature above a thermal transition temperature for the PTFE thus setting a node/fibril structure in place
Implementation Method 3
applying heat and pressure to collapse the expanded tube and adhere the inside tube surfaces together
Implementation Method 4
adhere the inside tube surfaces together to form a substantially flat article
Implementation Method 5
drying the PTFE tube to remove the extrusion aid
Data Source
AI summary
Disclosed are versions of a prosthetic sling manufactured using an expanded fluoropolymer, e.g., PTFE. In some versions, a tubular ePTFE extrusion is, after initially processing, subjected to moderate temperatures and pressures to flatten the tubular extrusion such that it has rounded edges. In other versions a multiaxially expanded ePTFE strip is used.