In our opinion, Micro-Renathane® is the most blood-compatible tubing ever made. This polyurethane based catheter tubing is exceptional for implantation studies in experimental animals. Offering extended catheter life this tubing reduces the probability of intravascular thrombosis. Scanning electron micrographs (approx. 10,000X) illustrate the dramatic difference between Renathane tubing and conventional vinyl tubing. After use in hemodialysis, Renathane showed significantly fewer surface deposits of platelets, proteins, trapped red cells and other blood elements than other tubings.