| 摘要 |
<p>1. A measuring apparatus for thorax impedance measurement, wherein : a) the thorax impedance is determined by voltage measurement by means of contact electrodes with an impressed constant current, the electrodes being supplied by an alternating current generator, b) the measuring apparatus has a left (L) and a right (R) amplifier channel, c) phase-controllable rectifiers (13) are provided in the amplifier channels (L, R), and d) the outputs of said rectifiers (13) are connected to associated voltage display devices (15), characterized in that, e) the contact electrodes comprise at least one cranial electrode (1) which is connected to both amplifier channels (L, R) and two thorax side electrodes (2, 3) which are connected to the right and the left amplifier channels (L, R) respectively, f) for channel separation, there is provided a phase shift means (21) by means of which the constant current for the one channel is displaced through 90 degrees in phase relative to the constant current for the other channel, g) the phase-controllable rectifiers (13) are controlled in accordance with the phases of the constant currents of the right and the left channels respectively, and h) the outputs of the rectifiers (13) are respectively connected to the associated voltage display device (15) by way of a respective interposed integrator (14).</p> |
