Importance

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Abstract

An improved telemetry head that employs two coils is disclosed. A first, larger diameter outer coil is generally employed to initiate telemetric communication between the programmer or monitor and the implanted device. In the event that successful communication is not accomplished using the outer coil, the programmer or monitor attempts communication using the inner coil. Any resultant reduced signal strength that may be associated with use of the smaller diameter inner coil is acceptable based on the assumption that the antenna of the implanted device is located in the null associated with the outer antenna coil and thus is located in close proximity to the inner coil. To prevent loss of signal strength, addition turns may be employed to implement the inner coil. In one embodiment, at least one of the first and second coils is of a dual-coil configuration having two coils in series opposition to improve the signal-to-noise ratio.

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First Claim