Method and apparatus for monitoring intra ocular and intra cranial pressure
US8172769B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 2004 |
| Grant date | May 8, 2012 |
| Priority date | — |
| Expiry date | May 12, 2025 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B8/4227
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method and apparatus for measuring acoustic energy applied to the head to detect increases in intracranial pressure. Acoustic eye patches are applied to a patient's eye or eyelid, and an ultrasonic sweep generator applies an acoustic signal across the patient's skull, the signal being swept across a predetermined range. The eye patches have piezoelectric film sensors for measuring the acoustic signal. In one embodiment the predetermined range is in the ultrasonic band and an analyzer determines from the output of the sensors a resonant frequency and a damping of acoustic amplitude at said resonant frequency, there being a correlation between said damping and intra cranial pressure. In another embodiment the predetermined range includes a range less than 20 kHz and the analyzer determines retinal artery pulsations, with pressure being applied to the eye until the pulsations disappear, such pressure being a measure of intra cranial pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.