Apparatus and methods for communications with implanted active medical devices
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United States of America Patent
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Oct 7, 1997
Grant Date -
N/A
app pub date -
Dec 23, 1994
filing date -
Dec 31, 1993
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Process and apparatus for extracting a useful signal emitted by an implanted active medical device in the presence of parasitic signals. This device includes a plurality of signal receivers located at distinct points. The signal receivers are sensitive to the magnetic component of the electromagnetic signals and separated from each other by a distance that is negligible as compared to the wavelength of the electromagnetic signal. A plurality of amplifiers are provided with one amplifier being associated with each signal receiver and each amplifier having an adjustable gain. The amplified signals are summed by an adder, and the summed signal (V(t)) is evaluated using a magnitude (.vertline.V.vertline.) representative of the level of the summed signal. A processing means is used in the absence of the useful signal to adjust the gain of each amplifier, as appropriate, to minimize the magnitude in a preliminary step, and to maintain the amplifier gains at the adjusted values in a subsequent step, in the presence of the useful signal. As a result, the useful signal is acquired and the perturbing signals are suppressed.
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