Composite Multi-Layer PTFE Mesh for Hernia Repair
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current hernia repair and vascular tissue reconstruction methods face issues such as high incidence of post-operative adhesions, tissue migration, and immune responses due to the porosity and biocompatibility limitations of existing polytetrafluoroethylene (PTFE) materials, leading to complications like pain, infection, and increased morbidity.
Innovation Solution
A composite multi-layer material is created by combining high-density, unsintered polytetrafluoroethylene (d-PTFE) with an open structured material, reducing porosity and adhesion risk, while allowing for tissue colonization and blood flow, using techniques like stitching, pressure, or biocompatible adhesives for attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If expanded PTFE (e-PTFE) is used to provide biocompatibility and minimize adhesions, then adhesion incidence is reduced, but porosity increases which leads to tissue in-growth and structural weakness
Solution Approach 1:
The patent applies different porosity characteristics to different regions of the mesh. The e-PTFE layer has low porosity (0.03-0.1%) to minimize adhesions on the visceral side, while the polypropylene mesh layer has high porosity (30-70%) to promote tissue in-growth on the fascia side. This local differentiation resolves the contradiction by optimizing each region for its specific function.
Solution Approach 2:
The patent combines e-PTFE and polypropylene mesh into a laminated composite structure. The e-PTFE layer provides adhesion resistance and biocompatibility, while the polypropylene mesh provides structural strength and tissue in-growth capability. This composite approach allows each material to contribute its advantageous properties without compromising the other.
2Strength
If open structured polypropylene mesh is used to promote tissue in-growth, then tissue integration is improved, but adhesion incidence increases due to higher porosity
Solution Approach 1:
The patent assigns different porosity characteristics to different regions: the polypropylene mesh layer has high porosity (30-70%) to promote tissue in-growth where needed, while the e-PTFE layer has low porosity (0.03-0.1%) to minimize adhesions. This spatial differentiation allows simultaneous achievement of tissue integration and adhesion resistance.
Solution Approach 2:
The laminated composite structure combines polypropylene mesh with e-PTFE, where the polypropylene provides tissue in-growth capability and the e-PTFE provides adhesion resistance. The composite nature allows both materials to function simultaneously without interfering with each other's primary functions.
3Object-affected harmful factors
If d-PTFE is used to reduce porosity and adhesion risk, then adhesion incidence is minimized, but tissue colonization capability is reduced
Solution Approach 1:
The patent divides the mesh into separate functional layers: a d-PTFE layer with low porosity for adhesion resistance and a polypropylene mesh layer with high porosity for tissue colonization. Each layer performs its specific function optimally without interfering with the other layer's capabilities.
Solution Approach 2:
The composite structure combines d-PTFE with polypropylene mesh, where the d-PTFE provides adhesion resistance through low porosity and the polypropylene mesh provides tissue colonization capability through high porosity. The combination allows both functions to coexist and work together synergistically.
Data Source
AI summary
A composite multi-layer material may generally comprise a d-PTFE material combined with an open structured material (either resorbable or non-resorbable) creating a composite multi-layer material. Attachment of the layers may be accomplished by stitching layers of material, exertion of hydraulic or other pressure, application of a biocompatible adhesive or heat, or some combination of the foregoing. Use of a d-PTFE, unexpanded material has multiple alternative uses, including without limitation, placement on the visceral side of a hernia that may minimize or even eliminate the incidence of abdominal adhesions. Alternatively, the material may be used to create tubing sufficient as a graft for treating abdominal aortic aneurysms.