Patency and long-term biological fate of a two-ply biodegradable microarterial prosthesis in the rat.
This study was undertaken to determine the long-term performance of a two-ply biodegradable, compliant microarterial prosthesis for its ability to function successfully as a temporary scaffold for the regeneration of a neoartery. Two-ply microarterial prostheses (internal diameter 1.5 mm, length 1 cm), prepared from a polyurethane-based (PU) material, were implanted into the abdominal aorta of rats (n = 22) and were evaluated at 3 months (n = 6), 6 months (n = 6) and one year (n = 10) after implantation, by means of macroscopic inspection, light microscopy and electron microscopy. All implants were patent and all, except two with a very small local dilatation at one year, were normally shaped. Arterial pulsations were reduced but still visible in all implants. In all implants a neoartery had regenerated: (1) a complete neointima composed of endothelial cells, (2) a neomedia composed of smooth muscle cells surrounded with elastin and collagen and of comparable thickness to rat media, and (3) a neoadventitia composed of fibrohistiocytic tissue that had organised the graft wall. In 2 out of the 10 one-year implants, smooth muscle cells were predominantly circularly arranged as in normal arterial tissue; in all other implants smooth muscle cells were predominantly longitudinally arranged. These results demonstrate that two-ply biodegradable PU-based prostheses have a good long-term performance when implanted into rat abdominal aortas.
Robinson
P H
PH
University Hospital, The Netherlands.
van der Lei
B
B
Knol
K E
KE
Pennings
A J
AJ
D000818:Animals; D001012:Aorta, Abdominal / Q000601:surgery*; D001673:Biodegradation, Environmental; D001807:Blood Vessel Prosthesis / Q000379:methods; D005069:Evaluation Studies as Topic; D008297:Male; D008855:Microscopy, Electron, Scanning; D008866:Microsurgery; D011140:Polyurethanes; D051381:Rats; D011919:Rats, Inbred Strains; D013997:Time Factors
D011140:Polyurethanes