Processes @entity1 umbilical veins as arterial substitutes--evaluation in XXXX models.

@entity1 @entity21935 @entity235 @entity254 @entity3584 @entity715 @entity1068
@entity1 umbilical cord vein segments have been used as vessel substitutes for damaged or occluded arteries, as aorto-coronary by-passes and as arterio-venous fistulae for dialysis. The Dardik-Biograft fixed with @entity3584 and the Mindich-Bioflow, fixed with @entity1068 and @entity21935 starch, are commercially available. They were implanted in @entity235 as replacements for a segment of the abdominal aorta. Post-implantation status was followed by angiography. They were evaluated after removal from sacrificed animals with the aid of scanning electron microscopy and histological techniques. Attention was focused on vessel patency, dimensional stability, integrity of the @entity254 line, lumen wall microstructure, evidence of suture damage and @entity715 deposition pattern. Both types of grafts gave functional by-passes for at least until 6 months post-implantation. The Dardik-Biograft appeared more prone to @entity715 formation near the @entity254 . Sparse cellular development was also noted. The Mindich-Bioflow gave rise to a prosthesis of superior thromboresistance which was more subject to mechanical damage.
