Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1995-06-07
1997-11-25
Getzow, Scott M.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
A61N 1378
Patent
active
056906935
ABSTRACT:
An improved transcutaneous energy transmission device is disclosed for charging rechargeable batteries in an implanted medical device. A current with a sinusoidal waveform is applied to a resonant circuit comprising a primary coil and a capacitor. Current is induced in a secondary coil attached to the implanted medical device. Two solid state switches are used to generate the sinusoidal waveform by alternately switching on and off input voltage to the resonant circuit. The sinusoidal waveform reduces eddy current effects in the implanted device which detrimentally increases the temperature of the implanted device. The present invention charges the batteries using a charging protocol that reduces charging current as the charge level in the battery increases. The controller preferably is constructed as a pulse width modulation device with a variable duty cycle to control the current level applied to the primary coil. An alignment indicator also is provided to insure proper alignment between the energy transmission device and the implanted medical device.
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Sipex Corporation Signal Processing Excellence; Analog Array ASIC Design Manual, Mar. 1991 (Chapter 3).
Munshi Mohammed Zafar Amin
Wang Xintao
Getzow Scott M.
Heim Michael F.
Sulzer Intermedics Inc.
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