Indications for Use:
The surgical resection of cerebral cortex is often limited by neighboring regions of essential functional cortex. There is a high degree of individual variability with respect to cortical topography and functional localization [Ojemann, 1989]. The OCS-1 is intended for intraoperative cortical stimulation mapping to aid in cortical resections in the vicinity of essential cortex.

Cortical stimulator
Designed in collaboration with Dr. George Ojemann at the University of Washington, the Ojemann Cortical Stimulator is the industry standard for cortical stimulation mapping procedures. This portable, constant current unit has simple, uncomplicated controls and current settings suitable for use in the awake or anesthetized patient. The Ojemann Cortical Stimulator is a compact, battery-powered unit and supplies up to 20 milliamps current (peak to peak).

• Greatly simplifies intraoperative cortical mapping
• Portable, battery-operative design
• Wide range of constant current outputs
• Several durations and rates to choose from
• Adjustable audible tone indicates output rate
  
  

SPECIFICATIONS
Current output: There are two selectable ranges:0-1 MA peak and 0-10 MA peak to peak. There are two knobs that allow continuous adjustments within these ranges.
Current Waveform: Biphasic rectangular waveforms with rate selectable at 5, 10, 20, 50, 60 ,75, and 100 pulses/sec and duration selectable at 0.1, 0.2, 0.5, 1, and 2 millisecond. The polarity (positive or negative leading pulse) is also selectable.
Load Impedance Range: 0-200 ohms.
Power Source: Four standard 9-volt alkaline transistor batteries.
Audio Tone: Audible beep is generated at the selected pulse rate to indicate output. Loudness is adjustable by a volume knob.
Measurement: 10” x 7” x 4” (25.4 x 17.8 x 10.2 cm)
Weight: 5 lbs (2.3 kilos)
Probe Part #: OCS-P probe
Tip Material: Polished stainless steel
Tip Ball Diameter: 2 mm
Inter-ball spacing: 5 mm