Interference protection circuit for synchronisable heart pacemaker - has trigger signal time delay circuit and disturbance signal detector together driving evaluation logic unit

摘要

The protective circuit is for triggered equipment, particularly synchronisable heart pacemakers having an input amplifier detecting wanted signals followed by triggered circuits generating corresponding output signals. A time delay (5) device is controlled by signals arriving via the input (11). An interference signal detector (13) incorporates an induction coil (4) and if necessary an amplifier (3). The time delay device and the detector together drive an evaluation logic unit (6) connected to the triggered circuit (2), so that when a signal appears at the coil triggering of the circuits is prevented for a predetermined period.