Inclusion Criteria:

• Age ≥18 years, regardless of gender;
• Patients suitable for percutaneous coronary intervention (PCI) and for whom the use of an extension catheter is planned to assist the intervention;
• Ability to understand the purpose of the study, willingness to voluntarily participate, and ability to provide written informed consent.

Exclusion Criteria:

• Reference vessel diameter < 2 mm;
• Presence of thrombus in the target vessel;
• Unprotected left main coronary artery disease;
• Acute myocardial infarction occurring within 7 days prior to enrollment;
• Known intolerance to anticoagulant or antiplatelet therapy, or known allergy to contrast media;
• Concurrent severe hepatic or renal disease, or other severe systemic conditions that render the patient unsuitable for PCI;
• Pregnant or lactating women;
• Currently participating in another clinical trial of a drug or medical device without having reached the primary endpoint or completed the trial;
• Any other condition that, in the investigator's opinion, makes the patient ineligible for participation in this study.