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目的：探讨SilverHawkTM直接斑块切除术治疗下肢动脉硬化闭塞症( ASO)的临床疗效及其安全性。方法应用SilverHawkTM斑块切除系统累计治疗32例ASO患者,临床表现( Fontaine分类)：Ⅱa级2例,Ⅱb级18例,Ⅲ级8例,Ⅳ级4例。踝肱指数(ABI)为0.18~0.67,平均(0.46±0.05)。术后对临床症状以及管腔通畅情况进行随访。结果32个闭塞病变均经腔内开通成功,技术成功率为100%(残余狭窄<30%),临床症状均消失或明显改善；Fontaine分类：I级以上26例,Ⅱa级6例。术后患肢ABI为0.76~1.16,平均(0.92±0.07),与术前比较差异有统计学意义(P0.05)。结论 SilverHawkTM直接斑块切除术是治疗下肢动脉硬化闭塞症的一种安全有效的新方法。“,”Objective To evaluate the clinical safety and effect of SilverHawkTM directional atherectomy device on the treatment of lower arteriosclerosis obliterans. Methods A total of 32 patients with lower extremity ischemia were treated with SilverhawTM drection-al atherectomy in our department. Clinical symptoms( Fontaine classification) were applied in all cases:2 cases of Ⅱa,18 cases of Ⅱb,8cases of Ⅲ,and 4 cases of Ⅳ. ABI level was 0. 18 to 0. 67. Patency was evaluated with color duplex sonography or CTA except clinical examination during follow-up. Results Totally 32 occlusive lesions were recanalizated successfully. The technical successful (residual stenosis<30%) rate was 100%. Clinical symptoms were obviously improved or disappeared. The ABI was from 0. 76 to 1. 16. Fontaine classification:26 cases ofⅠ,6 case ofⅡa. Patency rate was 100% and the ABI was from 0. 73 to 1. 16. Fontaine classi-fication keep unchanged after 1~12 months. Conclusion It is a safe and effective approach for the treatment on lower arteriosclerosis obliterans with SilverhawkTM drectional atherectomy.