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Biologically Functionalized Expanded Polytetrafluoroethylene Blood Vessel Grafts
Dongfang Wang1,2,3,4, Yiyang Xu3,4, Yu-Jyun Lin3,4
1School of Mechanics and Engineering Science, Zhengzhou University, Zhengzhou 450001, P. R. China.
Biomacromolecules
|August 14, 2020
Summary
Researchers developed novel biofunctionalized expanded polytetrafluoroethylene (ePTFE) blood vessel grafts using a bulk treatment method. This approach enhances long-term patency for small-diameter blood vessel (SDBV) grafts, addressing a critical challenge in cardiovascular disease treatment.
Area of Science:
- Biomaterials Science
- Cardiovascular Engineering
- Medical Device Innovation
Background:
- Cardiovascular diseases necessitate effective small-diameter blood vessel (SDBV) grafts.
- Expanded polytetrafluoroethylene (ePTFE) is a potential material, but long-term patency remains a significant challenge.
- Current surface modification methods for ePTFE have limitations.
Purpose of the Study:
- To fabricate biofunctionalized ePTFE SDBV grafts with enhanced long-term patency.
- To develop a bulk treatment method for homogeneous and durable graft performance.
- To incorporate multiple functional biomolecules into ePTFE grafts in a single step.
Main Methods:
- A novel material formulation and alcohol/water lubricating agent were employed.
- Functional biomolecules (arginylglycylaspartic acid, heparin, selenocystamine) were embedded via paste extrusion and ePTFE expansion using water as a solvent.
- Characterization included Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy.
Main Results:
- Successful incorporation of biomolecules into the bulk of ePTFE grafts was confirmed.
- Significantly improved biological functions were demonstrated through various assays.
- Enhanced cell viability, morphology, CD31 staining, nitric oxide release, and anticoagulation properties were observed.
Conclusions:
- The novel bulk treatment method offers a single-step approach to produce multibiofunctional ePTFE SDBV grafts.
- This fabrication technique holds significant commercial and clinical potential for treating cardiovascular diseases.
- The developed grafts show promise for overcoming the limitations of current SDBV graft technologies.
