EXPLORE MRace (GE): Early Feasibility Experience of Posterior Leaflet Restoration to Reduce Mitral Regurgitation Using the MRace Implant

Inclusion Criteria: 1. 18 years of age or older 2. Greater than moderate mitral regurgitation (Grade 3+ or higher) as confirmed by transesophageal echocardiography (TEE) within 90 days prior to study procedure 3. Patient must present with an STS Score less than 10% 4. High surgical risk for conventional mitral repair or replacement due to morphological criteria (e.g. leaflet or annulus calcifications), but operable, as assessed by the local heart team comprised of a cardiac surgeon experienced in mitral valve surgery and a cardiologist experienced in treating mitral valve disease and heart failure 5. New York Heart Association (NYHA) Functional Class III or IV 6. Patient willing to participate in study and provide signed IRB/EC-approved informed consent 7. Treating physician and patient agree that patient is able to return for all required post-procedure follow-up visits Exclusion Criteria: 1. Severe tricuspid regurgitation 2. Severe aortic stenosis or insufficiency 3. Severe mitral annulus calcification 4. Diseased mitral anterior leaflet such as flail / prolapse/ heavy calcification 5. Implanted vena cava filter 6. Femoral veins with severe angulation and calcification 7. Contraindication for transesophageal echocardiography (TEE) or MDCT scan 8. Active infection or endocarditis 9. Previous mitral valve surgery 10. Prior orthotopic heart transplantation 11. Pulmonary artery systolic hypertension \> 70mmHg 12. Evidence of intra-cardiac, inferior vena cava (IVC) or femoral venous thrombus 13. Left ventricular ejection fraction (LVEF) \< 20% 14. Implant or revision of any pacing device \< 30 days prior to intervention 15. Symptomatic coronary artery disease treated \< 30 days prior to study procedure 16. Myocardial infarction requiring intervention \< 30 days prior to study procedure 17. Infiltrative cardiomyopathies (e.g., amyloidosis, hemochromatosis, sarcoidosis), hypertrophic or restrictive cardiomyopathies, and constrictive pericarditis 18. Active peptic ulcer or upper gastrointestinal bleeding \< 90 days prior to study procedure 19. Stroke \< 180 days prior to study procedure 20. Severe renal insufficiency (creatinine \> 3.0 mg/dL) or Subject requiring dialysis 21. Cardiogenic shock at time of enrollment 22. Hemodynamic instability requiring inotropic support or mechanical heart assistance 23. Concurrent medical condition with a life expectancy of less than 2 years 24. Pregnancy or breastfeeding at time of enrollment 25. History of bleeding diathesis or coagulopathy or leukopenia (WBC \< 3,000 mcL) or acute anemia (Hb \< 9 g/dL) or thrombocytopenia (platelets \< 50,000 cells mcL) 26. Known hypersensitivity or contraindication to aspirin, heparin, ticlopidine or clopidogrel, nitinol, tantalum or allergy to contrast agents that cannot be pre-medicated 27. Emergency situations 28. Severe dementia or lack of capacity due to conditions that result in either inability to provide informed consent for the trial/procedure, prevent independent lifestyle outside of a chronic care facility, or will fundamentally complicate rehabilitation from the procedure or compliance with follow-up assessments 29. Company employees or their immediate family members 30. Subject is under guardianship 31. Subject is participating in another clinical study for which follow-up is currently ongoing.