A device for epicardial support and/or the assuming of cardiac activity having a double membrane (1) consisting of an elastic inner membrane (2) and a non-expandable outer membrane (3) as well as a closed cavity (4) formed therebetween which can be inflated and deflated by means of a fluid exhibiting a first chamber (6) allocated to the right ventricle (5) and a second chamber (8) allocated to the left ventricle (7). With the objective of further developing a device of the type as indicated at the outset so that same provides for simple device operability while maintaining the advantage of being able to augment only one ventricle, it is provided for the first chamber (6) and the second chamber (8) to be connected to one another by means of at least one valve (9) in a dividing wall (10) separating the two chambers (6, 8).
