Evoked Potential

Preventing Noise in the Operating Room

Preventing noise in the operating room

Challenges we face

Basic fundamentals of the way we amplify the physiologic signal
EKG ~1-2 millivolts
EEG 3-40 microvolts
EP ~10 microvolts sensory, ~1-5 millivolts motor
EMG 3 millivolts (EDB)
Line voltage 120 Volts RMS
Bipolar (Electrocautery) Less than 1000 volts
Bovie (ESU) Up to 10 kilovolts

Voltage source (the brain) drives a current through the recording circuit

The current builds up a voltage on each of the impedances in the circuit

The amplifier rejects common signals and amplifies differences between the signals it sees from electrode 1 and electrode 2


Evoked Potential
1640 Stockton Street ​#330071
San Francisco, California 94133
hello@evokedpotential.com