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Biodegradable, thermoplastic polyurethane grafts for small diameter vascular replacements.
Helga Bergmeister1, Nargiz Seyidova1, Catharina Schreiber1
1Division of Biomedical Research, Medical University of Vienna, Austria; Ludwig Boltzmann Cluster for Cardiovascular Research, Vienna, Austria.
Acta Biomaterialia
|September 15, 2014
Summary
Biodegradable thermoplastic polyurethane (TPU) vascular grafts demonstrate excellent in vivo performance, matching non-degradable controls. These thin-walled grafts promote host cell integration and reduce intimal hyperplasia, offering a promising alternative for vascular repair.
Area of Science:
- Biomaterials Science
- Vascular Surgery
- Tissue Engineering
Background:
- Permanent vascular prostheses pose risks like infection and lack of adaptation.
- Biodegradable grafts offer potential for host tissue integration and reduced complications.
- Current biodegradable grafts often lack sufficient mechanical strength and promote intimal hyperplasia.
Purpose of the Study:
- To evaluate the in vitro and in vivo biocompatibility of thin, host-vessel-matched biodegradable thermoplastic polyurethane (TPU) vascular grafts.
- To compare the performance of TPU grafts against expanded polytetrafluoroethylene (ePTFE) conduits in a vascular implantation model.
- To assess the host cell infiltration, patency, and remodeling of TPU grafts over time.
Main Methods:
- Fabrication of thin-walled TPU vascular grafts and ePTFE control conduits.
- In vitro assessment of endothelial cell proliferation on TPU grafts.
- In vivo implantation of grafts in a vascular model with retrieval at 1 week, 1, 6, and 12 months for analysis.
- Evaluation of graft patency, host cell infiltration, intimal hyperplasia, and tissue remodeling.
Main Results:
- TPU grafts exhibited significantly higher endothelial cell proliferation in vitro.
- Increased host cell population was observed in TPU conduits within 1 month post-implantation.
- Long-term implantation showed 100% patency for TPU grafts versus 93% for ePTFE, with no aneurysmal dilatation.
- Limited intimal hyperplasia (29%) was noted in ePTFE conduits, while absent in TPU grafts.
- Substantial, albeit variable, remodeling of degradable TPU grafts was observed.
Conclusions:
- Thin-walled biodegradable TPU vascular grafts present a viable alternative to permanent prostheses.
- TPU grafts demonstrate comparable long-term patency to ePTFE with improved host cell integration and reduced intimal hyperplasia.
- Biodegradable vascular implants offer significant advantages in terms of host tissue remodeling and reduced complications.
