• Patients aged between 18 and 85 years, regardless of gender.

• Patients must voluntarily participate in the study and sign an informed consent form.

• Patients must demonstrate sufficient adherence to the study protocol and agree to follow-up visits at 1 month (±7 days), 6 months (±14 days), 9 months (±30 days), 12 months (±30 days), and 24 months (±30 days) post-procedure, with angiography required at 9 months (±30 days).

• Patients must have evidence of myocardial ischemia.

• Angiographically confirmed primary coronary bifurcation lesions (Medina classification non-0, 0, 1) with branch stenosis ≥70% (estimated visually).

• Patients suitable for PCI where the branch lesion is not expected to require stenting; stenting is planned for the main vessel, with DCB used on the branch. It is recommended to treat the branch with DCB first, followed by main vessel stenting.

• Residual stenosis ≤50% after pre-treatment of the branch lesion, TIMI 3 flow, with no dissection or only A or B grade dissection. C grade dissections should be carefully considered by the investigator before deciding, and are generally not included.

• The diameter of the branch vessel must be between 2.0 mm and 4.0 mm, with a lesion length ≤40 mm.