FIELD: medicine. SUBSTANCE: vein diameter is measuring preliminary by ultrasonic diagnostic method using when Valsalva test reflux is appeared. Then soft tissue of extremity is squeezing until blood reflux disappearing to determine vein diameter at distal positioning with respect to valve. While operation performing vein is getting narrow up to this diameter. Corresponding spire for operation performing is preparing according to the last result of vein diameter metering. EFFECT: more short time of operation performing, less traumatic issue.
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