An orthopedic device adapted for implantation into a body where it contacts bone tissue is disclosed which has at least one spaced apart polarized magnetic element, at least one piezoelectric element or a combination of a polarized magnetic element and a piezoelectric element which are in direct contact...http://www.google.de/patents/US7431734?utm_source=gb-gplus-sharePatent US7431734 - Implanted prosthetic device
