Device for measuring and evaluating the pressure in the balloon cuff of a closed tracheal tube

摘要

A device for detecting and evaluating the pressure in the balloon cuff (3) of a closed tracheal tube (1) has a with the inflation cannula (6) of the balloon cuff (3) connected to pressure ^/ voltage converter (10) whose output voltage signal to monitor the static pressure at a first limit switch (23) and for monitoring the breath pressure fluctuations at a differentiating element (27) is connected. The output signal of the differentiating member (27) is rectified in a full wave rectifier (29) and a first integrator (30) supplied. A second limit switch (32) determines whether the breath pressure velocity remains within the intended range. The output signal of the second limit switch (32) feeds a second integrator (36), a deblocking the balloon cuff 3 by opening a solenoid valve (9) is triggered via the after exceeding a predetermined fault time.