Patent ID: 7635331
Filing Date: 2009-12-22
Classification: A61B,G01N

Abstract:
1. A non-invasive blood glucose sensor using a magneto-resonance absorption method, comprising: a measuring unit operable to form a plurality of magnetic fields, the plurality of magnetic fields operable to measure a spin-lattice relaxation time of protons in a tissue of a finger, the measuring unit further operable to apply electromagnetic waves and use a magneto-resonance method to detect a nuclear magneto-resonance-absorption signal; and a circuit unit operable to generate the electromagnetic waves and determine the spin-lattice relaxation time, the circuit unit further operable to determine a blood glucose concentration in a human body based on the nuclear magneto-resonance absorption signal, wherein the measuring unit comprise: a detector which is sized to accept and fix a single finger to measure the spin-lattice relaxation time; a sensor coil operable to apply electromagnetic waves to the detector and measure the nuclear magneto-resonance absorption signal, the electromagnetic waves having a frequency adapted to produce a nuclear magneto-resonance; a pair of permanent magnets operable to apply a uniform constant magnetic field to the detector; a pair of pole pieces operable to improve a uniformity of the constant magnetic field; a pair of low frequency coils wound around the permanent magnets and operable to apply a low frequency modulation magnetic field to the detector; a shield in which the detector and the sensor coil are embodied, which shield couples the detector and the sensor coil to the pole pieces; a pair of acoustic waves coils operable to apply an acoustic wave modulation magnetic field to the detector to detect a weak absorption signal, the acoustic magnetic coils being disposed at an outer side of the shield; and a cylindrical shell operable to couple internal elements to form a magnetic circuit and performing magnetic shielding.