Patent ID: 7288062
Filing Date: 2007-10-30
Classification: A61N

Abstract:
1. An apparatus for creating therapeutic charge transfer in tissue, comprising: a coil generating a changing magnetic field to induct an electric field in the tissue exceeding 10 mV/cm when said coil is 5 cm from the tissue, said magnetic field having a growth phase and a decay phase, a duration of the growth phase being at least ten times a duration of the decay phase; and a control circuit controlling a current fed to said coil, said control circuit including two subcircuits and a switch for switching between a first of said subcircuits and a second of said subcircuits, said first of said subcircuits causing said growth phase, said second of said subcircuits causing said decay phase; each one of said subcircuits having a respective time constant (λ) equaling an inductance (L) divided by a resistance (R) of said respective one of said subcircuits; and said λ of said second subcircuit being at least ten times said λ of said first subcircuit.