Patent ID: 8926515
Filing Date: 2015-01-06
Classification: A61B

Abstract:
1. An apparatus for non-invasively and continuously obtaining an indication of absolute intracranial pressure comprising: a non-invasive ultrasonic Doppler device, said ultrasonic Doppler device continuously measuring the pulsatility index of blood flow in the intracranial portion of an eye artery (P.I.(int)) and generating an internal pulsatility index signal representative thereof, and continuously measuring the pulsatility index of blood flow in the extracranial portion of said eye artery (P.I.(ext)) and generating an external pulsatility index signal representative thereof; a depth control network coupled with said non-invasive ultrasonic Doppler device, said depth control network enabling said non-invasive invasive ultrasonic Doppler device to sequentially measure the pulsatility index of blood flow in the intracranial portion and extracranial portion of said eye artery; an inflation device, said inflation device applying an external pressure against an eye, measuring the external pressure applied against the eye, and generating an external pressure signal representative of the measured external pressure; and a processor for receiving the external pressure signal, the internal pulsatility index signal, and the external pulsatility index signal and calculating a conversion factor (Ω) therefrom for converting said internal pulsatility index signal and said external pulsatility index signal into an indication of continuous intracranial pressure.