Methods and compositions for treating a congenital heart disease and methods and compositions for prognosing or diagnosing a congenital heart disease in a subject are disclosed. The power bus includes a bus capacitor for storing charge and can have a varying load. The end effector can be configured to be movable between a first configuration in which the end effector is longitudinally aligned with or linear relative to the shaft and a second configuration in which the end effector is articulated at an angle beyond 45 degrees relative to the shaft.