Early Feasibility Study of Surgical Implantation of a Polymer Prosthetic Mitral and Aortic Valve

Inclusion Criteria: * Adults requiring surgical replacement of either mitral or aortic valve * Capable of undergoing cardiopulmonary bypass * Able to tolerate anticoagulation therapy * Able to understand study purpose, willing to provide informed consent and comply with follow-up Exclusion Criteria: 1. History of previous cardiac valve surgery or percutaneous valve replacement, including surgical aortic or mitral valve replacement (excluding Percutaneous Balloon Mitral Valvuloplasty \[PBMV\], which is permitted). 2. Requirement for urgent or emergency cardiac surgery. 3. Planned concurrent aortic valve surgery or combined valve procedure (e.g., simultaneous aortic and mitral valve surgery). 4. Scheduled coronary artery bypass graft (CABG) during the same admission. 5. Anticipated need for additional non-valve cardiac surgery within 12 months. 6. Active systemic infection, including pneumonia or infective endocarditis. 7. Intracardiac thrombus detected on echocardiography or imaging. 8. Stroke or transient ischemic attack within the prior 3 months. 9. Myocardial infarction, unstable coronary syndrome, or coronary revascularization within the prior 3 months. 10. Severe comorbidities with expected life expectancy \<12 months, including Child-Pugh C liver disease, end-stage malignancy, or advanced pulmonary disease. 11. Participation in another interventional clinical trial involving investigational devices or drugs. 12. Anatomical risk factors such as ascending aortic aneurysm (≥50 mm), bicuspid aortic valve with ascending aorta ≥45 mm, or other high-risk features identified on imaging. 13. Left ventricular ejection fraction (LVEF) ≤35%, indicating severe systolic dysfunction. 14. Severe renal insufficiency, e.g., estimated GFR \<30 mL/min/1.73 m² or requirement for chronic dialysis. 15. Coagulopathy or active bleeding disorders, e.g., INR \>1.5 without anticoagulation therapy. 16. Hematologic abnormalities: hematocrit \<30%, hemoglobin \<100 g/L, platelet count \<100 × 10⁹/L, or WBC \<4 × 10⁹/L or \>10 × 10⁹/L. 17. History of substance abuse, chronic alcoholism, or significant psychiatric illness impairing study compliance. 18. Preoperative or intraoperative anatomical unsuitability of the valve apparatus or cardiac structure. 19. Known allergy or hypersensitivity to polyurethane, polyester, or sulfonate-based biomaterials used in the valve prosthesis. 20. Withdrawal from the study after valve implantation (such participants are not allowed to re-enroll).