血管腔内近距离治疗预防血管成形术后再狭窄 ,是近年来一项尖端课题 ,且迅速发展成一门崭新的学科———血管腔内近距离治疗学。冠心病患者经ＰＴＣＡ治疗后 ,术后血管即刻再通率达95 %以上 ,但在ＰＴＣＡ后 3～ 6个月内 40 %～ 6 0 %出现再狭窄(ｒｅｓｔｅｎｏｓｉｓ,ＲＳ) , Vascular cavity brachytherapy to prevent restenosis after angioplasty is a cutting-edge subject in recent years, and it has rapidly developed into a new discipline, intravascular endovascular therapy. After coronary artery disease was treated with PTCA, the rate of immediate recanalization of the blood vessels after surgery was more than 95%, but restenosis (RS) occurred in 40% to 60% of the patients within 3 to 6 months after PTCA.