medical device and kit for repairing a heart valve the present invention generally relates to techniques for repairing and / or replacing heart valves, annuloplasty devices, and related tools. The medical device that facilitates the repair and / or replacement of a defective heart valve in a patient's heart, comprises a size reduction element in the form of a loop (40) having a helical structure that is arranged on an imaginary cylinder and where a defined distance is maintained between the subsequent turns of its helix, the reduction element (40) comprising: a first support ring (41) disposed proximally, an element in the form of a distal helical loop (42) disposed distally； and a second support ring (43) between the first support ring (41) and the distal helical loop element (42)； the first support ring (41) and the second support ring (43) are configured to be arranged on opposite sides of a cardiac valve annulus, the second support ring (43) having a smaller diameter than the element in the form of a distal helical loop (42)； the element in the form of a distal helical loop (42) being adapted to bend all the cords (26, 28) of the heart valve, such that the second support ring (43) is arranged to reposition the cords (26, 28) towards the valve center when the size reduction element (40) is rotationally inserted into the heart, and the loop size reduction element (40) is designed to automatically provide the size reduction heart valve upon insertion.dispositivo médico e kit para reparar uma válvula cardíaca a presente invenção refere-se geralmente a técnicas de reparo e/ou substituição de válvulas cardíacas, dispositivos de anuloplastia, e ferramentas relacionadas. o dispositivo médico que facilita um reparo e/ou substituição de uma válvula cardíaca defeituosa de um coração de um paciente, compreende um elemento de redução de tamanho na forma de laço (40) tendo uma estrutura helicoidal que está disposta sobre um cilindro imaginário e onde uma distância definida é
