Probing device for spinal surgery, has voltage source supplying two electrodes, where one electrode projects onto peripheral surface of penetration instrument and presents position shifted with respect to longitudinal axis of instrument

摘要

The device has a voltage source supplying two electrodes (3, 4) and an inductometer for measuring the impedance between the electrodes. The electrode (3) projects onto the peripheral surface of a penetration instrument. The electrode (3) presents a position shifted with respect to a longitudinal axis of the instrument. The electrodes are separated from each other by an insulator (5).