The development of cardiovascular care in the western world is being driven towards less invasive methods, where so-called catheterization replaces open heart surgery. Many patients with heart disease must undergo open heart surgery treatment, which is a major operation that is not without its risks. In the past 10 years or so techniques have been developed that imply, instead of an open operation, inserting a catheter in the groin and treating certain types of heart disease that previously required cardiac surgery. The purpose of the project is to continue the initial technological development of catheter treatment as well as the testing on explanted hearts.