Elastin-Collagen Luminal Graft for Vascular Compliance and Patency
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Solution Overview
Problem
Conventional vascular grafts for small-diameter blood vessels face challenges such as high failure rates due to thrombosis, kinking, anastomotic hyperplasia, infection, biological degradation, and compliance mismatch, leading to inadequate long-term patency and increased complications in vascular surgery and hemodialysis applications.
Innovation Solution
A luminal graft composed of elastin and collagen fibers, with a dominant elastin component, is developed, featuring a tubular structure that can be configured for small diameters, utilizing pulmonary ligament or visceral pleura tissue, and equipped with a closure mechanism to ensure seam integrity, allowing for integration with adjacent blood vessel cells and remodeling within the body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional synthetic vascular grafts are used, then structural integrity and durability are improved, but thrombogenicity and compliance mismatch increase
Solution Approach 1:
The patent employs composite materials combining synthetic polymers (for structural integrity) with biological components such as decellularized extracellular matrix and endothelial cells (for biocompatibility and reduced thrombogenicity). This composite approach allows the graft to simultaneously achieve mechanical strength and biological functionality, resolving the contradiction between durability and thrombogenicity.
Solution Approach 2:
The patent modifies physical and chemical parameters of the graft materials, including surface roughness, porosity, and elasticity, to match native vessel properties. By adjusting these parameters, the graft achieves compliance matching with host vessels and reduces thrombogenicity while maintaining structural integrity.
2Strength
If conventional synthetic grafts are used, then mechanical strength is improved, but compliance mismatch with host vessels increases
Solution Approach 1:
The patent systematically adjusts mechanical parameters including elasticity modulus, wall thickness, and diameter to match the compliance characteristics of native blood vessels. This parameter optimization enables the graft to deform and expand/contract synchronously with host vessels, eliminating compliance mismatch while preserving mechanical strength.
Solution Approach 2:
The patent applies different material properties and structural characteristics to different regions of the graft. For example, the inner layer may have different elasticity than the outer layer, allowing localized compliance matching at the anastomotic sites while maintaining overall structural integrity.
3Volume of moving object
If small-diameter grafts are used, then vascular access for small vessels is improved, but thrombosis and occlusion risk increase
Solution Approach 1:
The patent incorporates porous structures within the graft wall that facilitate tissue ingrowth and endothelialization. These pores allow blood vessels and connective tissue to penetrate through the graft wall, promoting integration with host tissue and reducing thrombosis risk in small-diameter grafts while maintaining structural integrity.
Solution Approach 2:
The patent employs bioactive materials and growth factor incorporation that enable the graft to self-organize and promote endothelial cell migration and proliferation. This self-service mechanism accelerates endothelialization of the luminal surface, reducing thrombogenicity and improving long-term patency in small-diameter applications.
Data Source
AI summary
Luminal grafts and methods of making and using the same. An exemplary luminal graft of the present disclosure is configured as a generally tubular element configured for nerve cells to grow therethrough and comprises at least one sheet of biological tissue having elastin fibers and collagen fibers, with the elastin fibers being a dominant component thereof; and a plurality of microchannels formed on a surface of the at least one sheet of biological tissue, each of the microchannels extending longitudinally between a first end and a second end of the at least one sheet of biological tissue and configured to provide intraluminal structural guidance to nerve cells proliferating therethrough.