Experiments were performed on 14 dogs to investigate the correlation of diameter of the Fogarty catheters’ balloon and cumber of times of passing caiheters t-hrough vessel with severith of acute

damage to arterial and venous walls. We studied the ultrastructure changes of damage to abdominal aoria and inferior vena cava casued by ’;he Fogarty balloon catheters on dogs

when balloon diameter war-e equal to 1.5 and 2 times the calibres of vessel and the number of times of catheters passing through vessel was once

twice and three times respectively. Based on the ultrastructure changes

we divided damages into mild( I )

moderated) a-nd severe( I )degrees. The results indicated that the larger the balloon diameter was and the more frequently the catheter passed

the more severe the damage 10 昦rterial and venous intima and media appered. But damage to most vessel (especially artery) was within the limits of intima. On same experimental conditions

damage to vein was more severs than that to artery