Safety and Performance Study of the NeoChord Device

Inclusion Criteria: * Age \>= 18 and \< 80 years * Candidate for surgical mitral valve repair or replacement * Isolated posterior leaflet prolapse * Moderate to severe or severe mitral valve regurgitation that is degenerative in nature Exclusion Criteria: * Anterior or bi-leaflet prolapse * Functional or ischemic MR * NYHA Class IV * Complex mechanism of MR (leaflet perforation, etc) * Significant tethering of leaflets toward LV apex * Severely calcified mitral valve annulus * Inflammatory valve disease * Severe LV dilation