An apparatus and method for preventing and therapeutically treating osteoporosis are provided. The apparatus includes a magnetic field generator for producing a controlled, fluctuating, directionally oriented magnetic field parallel to a predetermined axis projecting through the target bone or skeletal...http://www.google.com.hk/patents/US5267939?utm_source=gb-gplus-share專利 US5267939 - Techniques for controlling osteoporosis using non-invasive magnetic fields
