An implant for treating mal-coaptation of a heart valve, the heart valve having an annulus and first and second native leaflets with an open configuration and a closed configuration, the implant comprising: a coaptation assist body having a first coaptation surface configured to be disposed toward the native posterior leaflet, an opposed second surface configured to be disposed toward the native anterior leaflet, wherein, during use, the coaptation assist body is disposed between the native leaflets to close the gap caused by mal-coaptation of the native leaflets (30, 32) by providing a surface for the anterior native leaflet to coapt against, while effectively replacing the posterior native leaflet in the area of the valve which it would occlude during systole, were it functioning normally; wherein the coaptation assist body is elongate and narrow between anterior and posterior surfaces; wherein a superior edge of the coaptation assist body is curved to match the general shape of the annulus or adjoining atrial wall; wherein the coaptation assist body comprises at least one ribbon, wherein the at least one ribbon resists movement of the implant, wherein the at least one ribbon extends in a direction from the coaptation assist body, wherein the at least one ribbon comprises a shape memory material having a preformed shape with at least one curve, wherein the ribbon is movable from a first compressed configuration to a second expanded configuration, characterized in that the at least one ribbon has a generally U-shaped configuration, and wherein the at least one ribbon is configured to abut tissue and the at least one ribbon has a bias such that the at least one ribbon exerts a force and rests against the tissue of the heart. a coaptation assist body having a first coaptation surface configured to be disposed toward the native posterior leaflet, an opposed second surface configured to be disposed toward the native anterior leaflet, wherein, during use, the coaptation assist body is disposed between the native leaflets to close the gap caused by mal-coaptation of the native leaflets (30, 32) by providing a surface for the anterior native leaflet to coapt against, while effectively replacing the posterior native leaflet in the area of the valve which it would occlude during systole, were it functioning normally; wherein the coaptation assist body is elongate and narrow between anterior and posterior surfaces; wherein a superior edge of the coaptation assist body is curved to match the general shape of the annulus or adjoining atrial wall; wherein the coaptation assist body comprises at least one ribbon, wherein the at least one ribbon resists movement of the implant, wherein the at least one ribbon extends in a direction from the coaptation assist body, wherein the at least one ribbon comprises a shape memory material having a preformed shape with at least one curve, wherein the ribbon is movable from a first compressed configuration to a second expanded configuration, characterized in that the at least one ribbon has a generally U-shaped configuration, and wherein the at least one ribbon is configured to abut tissue and the at least one ribbon has a bias such that the at least one ribbon exerts a force and rests against the tissue of the heart.