Figure 2
From: Noninvasive detection of elevated ICP using spontaneous tympanic membrane pulsation
Stethoscope setup for acquiring the TMp signal from the right and left ears. 3-way stop valves are used to route the TMp signal to two pressure transducers where the signal from each ear is connected to one transducer and is kept separate. Alternately, the valves can mix the two signals and route them to the same transducer. The middle stop valves were used to vent the system to atmosphere and to test the system air tightness. Tightness was tested by applying about 2 cm of water pressure using a syringe.
