Surgery – Diagnostic testing – Measuring fluid pressure in body
Patent
1995-04-25
2000-09-12
O'Connor, Cary
Surgery
Diagnostic testing
Measuring fluid pressure in body
600587, 600595, A61B 500
Patent
active
061170895
ABSTRACT:
An ultrasonic-based method for continuous, noninvasive intracranial pressure (ICP) measurement and monitoring is described. The stress level in the skull bone is affected by pressure. This also changes the interfacial conditions between the dura matter and the skull bone. Standing waves may be set up in the skull bone and the layers in contact with the bone. At specific frequencies, there are resonance peaks in the response of the skull which can be readily detected by sweeping the excitation frequency on an excitation transducer in contact with a subject's head, while monitoring the standing wave characteristics from the signal received on a second, receiving transducer similarly in contact with the subject's head. At a chosen frequency, the phase difference between the excitation signal and the received signal can be determined. This difference can be related to the intracranial pressure and changes therein.
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"Noninvasive Pressure Measurement", Devine et al, IBM Technical Disclosure Publication, Jan. 1978 vol. 20, No. 8.
Freund Samuel M.
O'Connor Cary
The Regents of the University of California
Wingood Pamela L.
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