Medical system for annuloplasty

A medical system for treating a defective mitral valve having an annulus, said system comprising in combination:

• a removable and flexible elongate displacement unit for temporary insertion into a coronary sinus adjacent said valve, wherein said displacement unit has
• a delivery state for delivery into said coronary sinus, and
• an activated state to which the displacement unit is temporarily and reversibly transferable from said delivery state, said displacement unit comprises
• a proximal reversibly expandable portion,
• a distal anchoring portion being movable in relation to said proximal expandable portion along a longitudinal axis of said displacement unit to said activated state in which the shape of the annulus is modified to a modified shape;
• and
• an annuloplasty device for permanent fixation at the mitral valve annulus by annuloplasty of the valve when said modified shape is obtained, wherein said annuloplasty device comprises a fixation structure that is adapted to retain said modified shape wherein the proximal expandable portion comprises first and second expandable loops, wherein in the delivery state said proximal expandable portion is compressed within a sheath, and the first and second loops are folded such as to be parallel with the longitudinal axis, and wherein in the activated state said proximal expandable portion is expanded, out of the sheath, wherein the first and second loops pivot away from the longitudinal axis in opposite directions from one another for positioning against a tissue wall outside the entrance of said coronary sinus for providing a counter force against said distal anchoring portion.