Abstract: ObjectiveTo evaluate the clinical therapeutic effect and safety of thrombus aspiration pipe device  on noreflow phenomenon in distal end of coronary  in emergency PCI patients. MethodsForty AMI patients of noreflow phenomenon in distal end of coronary during emergency PCI (TIMI grade≤1) AMI were divided into two groups. Both groups were experienced thrombus aspiration before stent implantation， then the stent implanting achived success. Experimental group as thrombus aspiration were operated after noreflow phenomenon by thrombus aspiration pipe device. Control group were bolused tirofiban and sodium nitroprusside by thrombus aspiration pipe device. TIMI flow grade and incidence rate of major adverse cardiovascular events（MACE）  and bleeding events were analyzed during hospitalization.ResultsCompared with control group，TIMI flow grade improved better in experimental group (P<0.05).The incidence of major adverse cardiovascular events（MACE）  in experimental group decreased(P<0.05). The incidence of bleeding in two groups showed no significant difference（P>0.05）.ConclusionUsing thrombus aspiration pipe device on noreflow phenomenon indistal end of coronary during emergency PCI improved TIMI flow grade and myocardial reperfusion. Moreover，the incidence of major adverse cardiovascular events（MACE） during hospitalization were decreased. The method was safe and available.

Key words: myocardil infarction；angioplasty, balloon, coronary, thrombus aspiration pipe installation, noreflow