Osteogenesis stimulator with digital signal processing

Osteogenesis stimulator with digital signal processing
United States Patent 6,937,905
Carroll , et al.
August 30, 2005
Inventors: Carroll; William J. (La Center, WA), McGraw; Michael B. (Vancouver, WA), Rux; William A. (Hillsboro, OR)
Assignee: International Rehabilitative Coion Sciences, Inc. (Vancouver, WA)
Appl. No.: 10/631,968
Filed: August 1, 2003

Abstract
A stimulator and a method for electrical stimulation of bone to promote osteogenesis is disclosed in which surface electrodes positioned around an incision site transmit an interferential current that has a base medium frequency alternating current between 1K-20 KHz. A digital signal processor generates a sine-wave-like waveform from a pulse generator which after further processing is used to generate two circuits for use in producing the interferential current. The effective area of stimulation is controlled by placement of electrodes and electrode orientation. Amplitude modulation of electrical circuits created at the electrode placements also augments the effective area of stimulation.