Surgery – Diagnostic testing – Measuring fluid pressure in body
Patent
1997-08-21
1999-02-23
Hindenburg, Max
Surgery
Diagnostic testing
Measuring fluid pressure in body
600587, 343767, A61B 500
Patent
active
058738401
ABSTRACT:
A system for monitoring intracranial pressure by an implantable cavity resonator unit and an associated externally located transceiver unit. The resonator unit includes a dielectric-filled cavity having a predetermined resonance frequency for high frequency electromagnetic waves. The cavity is bounded by a wall having a pair of intersecting slots forming a slot antenna and a deflectable diaphragm in communication with the interior of the cranium to deflect as a function of intracranial pressure. The deflection alters the resonance frequency of the cavity. The transceiver unit includes a linear wave guide having a pair of electrically conductive probes located in it. At least one of the probes is arranged to transmit an electromagnetic excitation wave from an associated transmitter through the slot antenna to cause the cavity to resonate at an altered resonance frequency, whereupon a resonance wave is reflected out of the cavity through the slot antenna. At least a second of the probes picks up the resonance wave and provides it to a receiver which provides an electrical signal indicative of the reflected wave. This signal is representative of the intracranial pressure. The cavity is sealed to prevent the ingress of body fluids therein.
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Hindenburg Max
Wingood Pamela J.
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