Method and apparatus for non-invasive blood analyte detector
First Claim
1. An apparatus adapted to be positioned in contact with a subject tissue for the purpose of non-invasively measuring blood constituents, the apparatus comprising:
- a) an ultrasound transducer for transmitting and receiving an ultrasound signal; and
b) electronic circuitry connected to the ultrasound transducer, for receiving a signal transmitted by said transducer through said subject tissue wherein said signal is modified through said transmission through said tissue, and for converting said received signal to a blood analyte concentration.
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Abstract
A non-intrusive, self-calibrating and self-contained wearable device that measures the concentration of blood constituents or analytes is provided. The device employs low energy, short burst ultrasonic waveforms which are transmitted into the body and a resulting return echo waveform is electronically analyzed to determine a “real-time” blood constituent level. Two return waveform characteristics allow continuous automatic calibration for accurate blood measurements regardless of the patient'"'"'s condition. The device is a completely self-contained system for the measurement, display and digital recording of blood glucose levels on a moment-to-moment basis.
21 Citations
24 Claims
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1. An apparatus adapted to be positioned in contact with a subject tissue for the purpose of non-invasively measuring blood constituents, the apparatus comprising:
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a) an ultrasound transducer for transmitting and receiving an ultrasound signal; and
b) electronic circuitry connected to the ultrasound transducer, for receiving a signal transmitted by said transducer through said subject tissue wherein said signal is modified through said transmission through said tissue, and for converting said received signal to a blood analyte concentration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21)
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14. A method of measuring a blood constituent comprising:
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a) emitting a calibration frequency signal into a subject tissue from a first position;
b) detecting a calibration echo signal from a reflection of the calibration frequency signal;
c) measuring a calibration transmittal time between emitting the calibration frequency signal and detecting the calibration echo signal;
d) emitting a detection frequency signal with a first amplitude into the subject tissue from the first position;
e) detecting an echo signal from the detection frequency signal and measuring a second amplitude of the detection frequency echo signal;
f) measuring a detection transmittal time between emitting the detection frequency signal and detecting the detection echo signal;
g) calculating a concentration of the blood constituent in the subject tissue from the calibration transmittal time, the detection transmittal time and an amplitude difference between the first and second detection frequency amplitudes.
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22. A non invasive detector for measuring a blood constituent the detector comprising:
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an ultrasonic transducer adapted to be placed on a subject tissue;
electronic circuitry associated with the transducer, said circuitry comprising;
1. a driving means for driving said transducer to emit a calibration ultrasonic signal having a first frequency and a detection ultrasonic signal having a second frequency;
2. a signal detection means for receiving said calibration and said detection ultrasonic signals after said signals have passed through said subject tissue;
3. a signal processing means for;
(a) measuring said calibration signal and said detection signals transit time through said subject tissue;
(b) measuring and comparing a change between an amplitude of the detection ultrasonic signals before and after the signal has passed through said subject tissue; and
(c) calculating said measured blood constituent; and
4. a signal output means indicating said measured blood constituent. - View Dependent Claims (23, 24)
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Specification