Electrospun Fiber Matrix for Arterial Vein Graft Patency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current arterial vein grafts (AVGs) face significant challenges due to intimal hyperplasia (IH), leading to occlusion and reduced long-term patency, limiting the effectiveness of coronary artery bypass grafting procedures.
Innovation Solution
A method involving the mechanical conditioning of arterial vein grafts by wrapping them with a biodegradable fiber matrix using electrospinning, which provides reinforcement and customization based on patient-specific parameters to enhance graft durability and integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If autogenous saphenous vein is used as graft, then graft availability and suitability are improved, but long-term patency deteriorates due to intimalhyperplasia
Solution Approach 1:
The vein graft is mechanically conditioned and treated with a polymer coating before implantation to prevent intimalhyperplasia. This preliminary treatment modifies the graft surface properties to resist the development of IH, thereby improving long-term patency while maintaining the availability of autogenous vein grafts
Solution Approach 2:
The mechanical conditioning process alters the physical and chemical parameters of the vein graft surface through controlled injury and polymer deposition. This changes the surface morphology, roughness, and compositional properties to create a more stable intima that resists hyperplastic changes
2Reliability
If mechanical conditioning treatment is applied to vein graft, then long-term patency is improved, but device complexity increases
Solution Approach 1:
The mechanical conditioning process is divided into distinct sequential steps: controlled mechanical injury, polymer solution application, and polymer deposition. This segmentation allows each step to be optimized independently and simplifies the overall process for clinical implementation while maintaining improved patency outcomes
Solution Approach 2:
A polymer coating acts as an intermediary layer between the vein graft and the arterial circulation. This intermediate polymer layer prevents direct contact between the graft intima and the arterial environment, thereby preventing intimalhyperplasia without requiring complex surgical techniques
3Reliability
If polymer coating is applied to graft, then occlusion rate is reduced, but manufacturing complexity increases
Solution Approach 1:
The polymer coating process is designed to be self-limiting and self-regulating. The polymer solution is applied in a controlled manner and automatically deposits only where needed on the graft surface during the mechanical conditioning process, eliminating the need for complex post-processing steps and reducing manufacturing complexity
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 approach improves the long-term patency of AVGs by reducing occlusion rates and minimizing surgical complications through enhanced mechanical properties and tailored biodegradation profiles, thereby improving the outcomes of arterial bypass procedures.
Implementation Method 1
the matrix is deposited onto tubular tissue by electrospinning
Data Source
AI summary
In some aspects, graft devices for a mammalian patient can include a tubular member comprising a first end; and a fiber matrix surrounding the tubular member, wherein the fiber matrix is designed and constructed to be substantially continuously tapered at the first end to define a diameter that increases as it approaches the first end.