A medical device for assisting in the maintaining of an opening created in the thoracic diaphragm is provided. The medical device comprises a diaphragm contacting part adapted to be placed in contact with the thoracic diaphragm and thereby assist in the maintaining of the opening created in the thoracic diaphragm. A pericardial drainage device for draining a fluid from the pericardium of a patient is further provided. The drainage device comprises a conduit; the conduit comprises a first and second section. At least a portion of the first section is adapted to receive a fluid inside of the pericardium. The second section of the conduit is adapted to be positioned outside of the pericardium of a patient and enable the exhaust of said fluid received from said pericardium through at least a portion of said second section.