The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 16, 1987
Filed:
Dec. 30, 1985
Albert B Welch, Dallas, TX (US);
Bio-Electric, Inc., Knoxville, TN (US);
Abstract
The treatment of biological tissue is effected by a pulsed electric field induced by a time changing magnetic field produced by a magnetic coil or a plurality of magnetic coils. These magnetic coils are arranged in the area of desired treatment and respond to a driving current to induce the pulsed electric field into the localized treatment area. The driving current and concomitant magnetic field generates an electric field waveform that has a first pulse in a positive direction having a selected value followed by a second pulse in a negative direction having a larger value than the first pulse, and in turn followed by a third pulse in the positive direction having a value on the order of the first pulse. The apparatus for applying the driving current includes switching circuitry for energizing the magnetic coils in pairs to induce a symmetrical distribution of the magnetic and electric fields in the treatment area. This achieves time averaged uniformity of the pulse electric field in the tissue for applications such as stimulation of osteogenesis in long bone nonfusions.