A medical implant for producing a therapeutic agent in a body. The medical implant comprises a pair of electrodes and a mechanism for creating an electrical potential between pairs of the electrodes. The electrical potential serves for electrochemically converting at least one substance present in the...http://www.google.de/patents/US20020188323?utm_source=gb-gplus-sharePatent US20020188323 - Methods, systems and devices for in vivo electrochemical production of therapeutic agents