Dual mode temperature transducer with oxygen saturation sensor
First Claim
1. An apparatus for detecting intracranial temperature and blood oxygenation in a patient, said apparatus comprisinga transducer having a working surface for placement against a patient'"'"'s cranium, said transducer includinga microwave antenna defining an aperture at or near said working surface, said antenna being tuned to a first frequency that produces a first output signal indicative of heat emanating from within a cranium against which it is placed,an oxygen saturation sensor sharing said aperture, said sensor including an electromagnetic radiation emitter which directs electromagnetic radiation across the aperture to a radiation detector, said detector senses any radiation not absorbed by a cranium against which the transducer is placed and produces a corresponding second output signal, anda control unit connected to the transducer, said control unit including a display,a radiometer centered on said first frequency and which receives said first output signal and produces a corresponding temperature signal, anda processor to process the second output signal and calculate an oxygenation value for display by the control unit,and furtherwherein said antenna is a rectangular waveguide having a pair of opposite broader walls and a pair of opposite narrower walls which define broader and narrower boundaries of said aperture, andthe emitter and detector are located opposite one another at said narrower boundaries.
2 Assignments
0 Petitions
Accused Products
Abstract
Apparatus for detecting intracranial temperature and blood oxygenation includes a transducer having a working surface for placement against a patient'"'"'s cranium. The transducer forms a microwave antenna having walls defining an aperture having a pair of opposite broader boundaries and a pair of opposite narrower boundaries at the working surface. The antenna is tuned to a frequency which produces a first output signal indicative of heat emanating from the cranium. An oxygen saturation sensor sharing that aperture includes a radiation emitter located at one of narrower boundaries which directs electromagnetic radiation across the aperture to a radiation detector at the other of the narrower boundaries and which produces a corresponding second output signal. A control unit includes a display and a processor for processing the signals to calculate an intracranial temperature and an oxygen saturation value for display by the control unit.
37 Citations
8 Claims
-
1. An apparatus for detecting intracranial temperature and blood oxygenation in a patient, said apparatus comprising
a transducer having a working surface for placement against a patient'"'"'s cranium, said transducer including a microwave antenna defining an aperture at or near said working surface, said antenna being tuned to a first frequency that produces a first output signal indicative of heat emanating from within a cranium against which it is placed, an oxygen saturation sensor sharing said aperture, said sensor including an electromagnetic radiation emitter which directs electromagnetic radiation across the aperture to a radiation detector, said detector senses any radiation not absorbed by a cranium against which the transducer is placed and produces a corresponding second output signal, and a control unit connected to the transducer, said control unit including a display, a radiometer centered on said first frequency and which receives said first output signal and produces a corresponding temperature signal, and a processor to process the second output signal and calculate an oxygenation value for display by the control unit, and further wherein said antenna is a rectangular waveguide having a pair of opposite broader walls and a pair of opposite narrower walls which define broader and narrower boundaries of said aperture, and the emitter and detector are located opposite one another at said narrower boundaries.
-
8. An apparatus for detecting intracranial temperature and blood oxygenation in a patient, said apparatus comprising
a transducer having a working surface for placement against a patient'"'"'s cranium, said transducer including a microwave antenna defining an aperture at or near said working surface, said antenna being tuned to a first frequency that produces a first output signal indicative of heat emanating from within a cranium against which it is placed, an oxygen saturation sensor sharing said aperture, said sensor including an electromagnetic radiation emitter which directs electromagnetic radiation across the aperture to a radiation detector, said detector sense any radiation not absorbed by a cranium against which the transducer is placed and produces a corresponding second output signal, and a control unit connected to the transducer, said control unit including a display, a radiometer centered on said first frequency and which receives said first output signal and produces a corresponding temperature signal, and a processor to process the second output signal and calculate an oxygenation value for display by the control unit, and further wherein the apparatus includes a modulator which modulates the electromagnetic emissions from said emitter to facilitate detection of the second output signal by the radiometer.
Specification