Apparatus for receiving telemetry signals from active implantable medical devices
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United States of America Patent
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Apr 21, 1998
Grant Date -
N/A
app pub date -
Mar 21, 1997
filing date -
Mar 22, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A device for the reception of signals emitted by an active implanted medical device. The device has a signal collector coil for the reception of a magnetic induction which receives a useful signal component (B.sub.s) emitted by the implanted device (26) and a parasitic signal component (B.sub.p) of external origin. There is at least one collecting coil (12) wound on a first portion (14) of a magnetic circuit and at least one compensation coil (22) wound on a second portion (20) of the magnetic circuit, the two portions of the magnetic circuit belonging to a common magnetic element (16) and being configured in a manner such that, when the device is disposed in face of the implanted device, the collecting coil is essentially crossed one time by the magnetic induction field lines of the useful signal component (B.sub.s) and the compensation coil is crossed essentially twice, in opposite direction, by the same magnetic induction field lines, thereby allowing to discriminate the useful signal component for improved signal to noise ratios and high speed data transmission.
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