Trial Goals:

1. Evaluation of Mid- to Long-Term Safety and Effectiveness of Drug-Coated Autoperfusion Balloon Dilatation Catheter (DCAB) versus Conventional Drug coated balloon (DCB) in Patients with ST Segment Elevation Myocardial Infarction (STEMI).
2. Evaluation of Hybrid IVUS-OCT System for Intraoperative Evaluation of DCAB or Conventional DCB Treatment Safety and Effectiveness for De Novo Lesions During Emergency Percutaneous Coronary Intervention (PCI) in Patients with STEMI.

The primary outcome is late lumen loss (LLL) assessed at 9 months following emergency PCI, measured using quantitative coronary angiography (QCA).

Inclusion Criteria:

1. Acute ST-Elevation Myocardial Infarction Meeting PPCI Criteria: 1) Chest pain lasting more than 20 minutes, with ST-segment elevation of at least 1 mm in two or more adjacent leads, new left bundle branch block, or evidence of posterior wall myocardial infarction; 2) Onset of symptoms within 12 hours.
2. Patients Who Have Received Thrombolytic Therapy Within 6 Hours of Symptom Onset and Are Eligible for Rescue PCI Within 24 Hours;
3. Infarct-Related Artery Selection Imaging and Pre-Treatment Criteria Meeting PPCI Standards: 1) De novo lesions. 2) Reference vessel diameter between 2.5 mm and 4 mm. 3) Successful pre-treatment of target lesions: post-pre-treatment residual stenosis of the culprit vessel ≤ 30%, with no type C dissections (or intravascular imaging indicating significant residual plaque burden at the site of dissection, with transverse expansion > 60°, longitudinal expansion > 2 mm, dissection involving the media or adventitia, and located at the distal end of the stent), no hematoma, and no significant thrombus (TIMI thrombus burden grade ≤ 2);
4. Sufficient compliance with the study protocol, agreement to undertake follow-up, and coronary angiography at 9 months;
5. Voluntary Participation in This Study, Including Signing a Written Informed Consent with Understanding of All Risks and Benefits Described in the Informed Consent Document.

Exclusion Criteria:

1. Age < 18 years and > 75 years;
2. History of prior myocardial infarction;
3. Allergy to contrast agent/inability to tolerate contrast;
4. Known contraindications / inability to tolerate bivalirudin, fondaparinux, heparin, aspirin, clopidogrel, and/or ticagrelor;
5. Complex coronary lesions: left main lesions, lesions at the ostia of the left anterior descending or circumflex arteries, lesion length > 30 mm, severe calcification, severe tortuosity or angulation, bifurcation lesions requiring the implantation of more than two drug-coated balloons (DCBs) or drug-eluting stents;
6. In-stent restenosis or in-stent thrombus lesions;
7. Planned simultaneous intervention on non-target lesions;
8. Active bleeding or recent history of bleeding;
9. Uncertain neurological outcomes, such as resuscitation;
10. Intubation / ventilation;
11. Cardiogenic shock prior to randomization;
12. Known intracranial disease (tumors, aneurysms, arteriovenous malformations, hemorrhagic CVA, ischemic CVA/TIA within the last 6 months, including permanent neurological deficits from ischemic cerebrovascular disease) ;
13. Refusal of blood transfusion;
14. Planned major surgery within 6 weeks;
15. Stent implantation < 1 month prior to enrollment;
16. Life expectancy of less than 12 months;
17. Participation in another clinical trial that interferes with this study.

The data is available and can be requested, subject to approval, if a reasonable clinical research analysis plan is provided to the corresponding author.

6 months

Submit a detailed research analysis plan to the corresponding author and apply through our email.

Using a core laboratory, an impartial third-party evaluation will be carried out for this study to objectively assess each participant's intravascular imaging and coronary angiography results.