MESSVORRICHTUNG ZUR STEUERUNG IMPLANTIERBARER KOERPERERSATZTEILE.

摘要

The measuring system has a catheter (3) with a single conductor (3a) between the pulse control circuit (1) and the sensor (2). Electrodes (6,7) on the body use the body tissue as a second condictor between sensor and control circuit. A detector (2b) controls the resistance of the sensor such that changes in current through the whole circuit including the conductors depends on the measurement but not on the resistance of the body tissue. A pulse from the control circuit is so short and low in energy that it causes no activity in the tissue. The detector is a resistor whose resistance change is large compared to that of the connecting lines.