Surgery – Truss – Perineal
Patent
1985-12-30
1987-06-16
Howell, Kyle L.
Surgery
Truss
Perineal
128 821, 128419F, 128421, A61N 140
Patent
active
046729518
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.
REFERENCES:
patent: 3890953 (1975-06-01), Kraus et al.
patent: 4095588 (1978-06-01), Goldman et al.
patent: 4315503 (1982-02-01), Ryaby et al.
PCT WO82/01135, 4-1982, Rosengant.
Herbst, Elec. Stim. of Bone Growth and Repair, F. Burny et al., edit, Springer-Verlag, Berlin and N.Y., 1978, pp. 1-13.
Bio-Electric, Inc.
Hanley John C.
Howell Kyle L.
Meier Harold E.
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