An electrode grid device is disclosed comprising a deformable envelope, further comprising non-polarizable electrodes and a pressure recording port. The device is designed to allow for monitoring of brain retraction pressure and local cortical electrical activity including DC potential, as well as to redistribute the force applied during retraction and thereby diminish the chance of focal brain injury during surgery. Retraction pressure recorded is equal over the full area of contact, providing a more meaningful measurement than simply at one point on the retractor. A means is disclosed for evacuation of air from the system to improve accuracy and fidelity of the pressure measurements. It is a further aspect of the device to allow for measurement of intracranial pressure, DC potential and EEG in epileptic and severe head trauma patients for management of edema and injury, respectively.
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