Taken from Futurism article: Now, scientists from the University of California, San Francisco and Vanderbilt University have developed a prototype device that mimics the function of a human kidney. Amazingly, using a silicon nanofilter to remove toxins, salts, some small molecules, and water from the blood, the device, which is only the size of a cup, is designed to function without a pump or electrical power. It solely works on blood pressure.

For the whole story go to: http://futurism.com/links/goodbye-dialysis-nanotechnology-used-to-make-artificial-kidney/