Chronic in Vivo Testing of a Fully Implantable Intracranial Pressure Sensor

This paper describes the authors´ approach to the problem of long term intracranial pressure measurement. Several prior devices have not proven useful for clinical studies of more than a few days duration. Study of 22 of the authors´ devices in primates has established the validity of both engineering and medical design assumptions. Useful pressure data has been collected for up to 2 months. Redesign to decrease tambour permeability should allow a useful life of months or years.