An implantable medical device for implantation in a mammal joint having at least two contacting surfaces is provided. The medical device comprises; an artificial contacting surface adapted to replace at least the surface of at least one of the mammal's joint contacting surfaces, wherein the artificial contacting surface is adapted to be lubricated, when implanted in said joint. Furthermore the medical device comprises at least one inlet adapted to receive a lubricating fluid from a reservoir, at least one channel at least partly integrated in the artificial contacting surface in connection with the at least one inlet for distributing the lubricating fluid to the surface of the artificial contacting surface. The medical device could be adapted to be operable by an operation device to receive the distributed lubricated fluid from a reservoir.

A coronary perfusion device comprises a first conduit and a second conduit. The first conduit and the second conduit can extend through the coronary ostia into the left and right coronary arteries when the coronary perfusion device is installed downstream of the aortic valve. In some examples, the coronary perfusion device comprises a circumferential channel extending between the first conduit and the second conduit. The circumferential channel can also define a trough to collect retrograde blood flow. The coronary perfusion device can also comprise an annular frame to secure the first conduit, the second conduit, and the circumferential channel relative to the native aorta. In some examples, the annular frame can be radially expandable or compressible to facilitate transcatheter delivery.