Inclusion Criteria:  (1) Age ≥ 18 years; (2) Voluntary signing of informed consent; (3) Onset of 12 hours STEMI patients who underwent PCI reperfusion therapy within time; (4) The guidewire passes through the lesion and the blood Heavy embolism load (TIMI thrombus classification ≥ 3).  Exclusion Criteria:  (1) Hemodynamics is unstable or there is cardiogenic shock; (2) After thrombolytic therapy; (3) The expected survival time is less than 6 months due to non-cardiac diseases; (4) Past trips Coronary artery bypass graft patients; (5) Participate in other drug and device research within 30 days; (6) Before surgery, clear active gastrointestinal bleeding or other contraindications for taking dual antiplatelet drugs (7) Patients deemed unsuitable for enrollment by other researchers