Method for preventing stray alternating current magnetic fields from interfering with implantable medical devices, comprises switch connected in parallel with transmitting and receiving coil

摘要

The implant (10) includes a detector of the presence of a programmer (120), a microprocessor (122), a communication sub-system (124), transmitter /receiver (126), a switch (130), stimulation/detection probes (16,18) and a transmitting /receiving coil (132). The switch is normally closed which prevents stray fields causing interference but when the presence of the programmer is detected the switch is opened to allow the passage of commands/data