Artificial systems within the human body can be anything from a artificial heart, to an artificial kidney, and even artificial lungs.  Event though the aspects of these prosthetic systems are beyond the scope of this website, they can be considered a very important part of the ideology behind biomaterials.  Many companies are currently working on this part of industry in particular as patients are continuously running into the problems of finding donors.  For more information please refer to this website:  UW Engineered Biomaterials