Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Reexamination Certificate
2008-09-09
2008-09-09
Layno, Carl H. (Department: 3766)
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
C607S048000, C600S554000
Reexamination Certificate
active
11050464
ABSTRACT:
Amplification of an evoked potential signal is carried out utilizing a high pass filter implemented as an integrator in a feedback loop which drives the DC offset voltage to zero. As a result, the feed-forward amplifier circuit has almost zero volts at its output since the only voltage remaining is the offset voltage of the operational amplifier, which is selected so as to maintain this parameter as low as possible. Because the voltage impressed across the feed-forward amplifier section is close to zero, the gain of this section can be set to zero during the time that the electrical stimulus pulse is present without introducing any additional artifacts and subsequent amplifier stages are not driven into saturation. When the electrical stimulus potential is no longer present or is significantly reduced in amplitude and before the time of receipt of the response signal, the feed-forward amplifier is brought back into the circuit to provide the high gain required to amplify the response signal, which can be measured without interference from saturation of any of the amplifier stages as they recover to baseline.
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Gehrke, Lombardi; Viking Select EMG 2 Channel Amplifier, Aug. 1, 2003; PCB Ref. 050-462102, sheet 3 of 10; Viasys Healthcare Neurocare Group, Madison WI.
Lombardi Daniel J.
Vos Steven
Baker & Hostetler LLP
Cardinal Health 209, Inc.
Gedeon Brian T
Layno Carl H.
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