A replacement heart valve, including a securing device (2) and a non-return valve (7), the securing device including a resiliently deformable material adapted to adopt collapsed and non-collapsed configurations, the resiliently deformable material having a memory such that it returns to the non-collapsed configuration when not held under tension, whereby the valve is adapted to be secured within the valve annulus. The securing device comprises two lobs connectedby a waist. Also featured is a method for replacing a heart valve and a kit, which uses this replacement heart valve together with a synching device for reshaping the coronary sinus.
