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1. CA2339325 - IMPLANTABLE NUCLEAR MAGNETIC RESONANCE SPECTROMETER

Anmerkung: Text basiert auf automatischer optischer Zeichenerkennung (OCR). Verwenden Sie bitte aus rechtlichen Gründen die PDF-Version.

[ EN ]
CLAIMS:
1. An implantable nuclear magnetic resonance spectrometer for at least one of measuring the chemical composition of a fluid and measuring the flow rate of the fluid, the spectrometer comprising: a housing; a catheter transversing across the housing so that a fluid external to the housing may flow through the catheter within the housing; a permanent magnet disposed within the housing that generates an intense homogenous magnetic field in the vicinity of the catheter; an electronics circuit disposed within the housing for detecting and formatting a nuclear magnetic resonance excitation signal; and at least one excitation coil connected to the electronic circuit and being disposed about the catheter to expose the fluid within the catheter to the excitation signal and to collect the nuclear magnetic resonance excitation signal.
2. An implantable nuclear magnetic resonance spectrometer according to claim 1, further comprising an antenna connected to the electric circuits for transmitting the formatted signal to an external reader unit by telemetry.
3. An implantable nuclear magnetic resonance spectrometer according to any one of claims 1 and 2, wherein the permanent magnet comprises an external cylindrical magnet and two internal cylindrical permanent magnets, each of the magnets having a polarization along its axis of symmetry, the direction of the polarization of the external magnet being in the opposed direction of the polarization of the two internal cylindrical permanent magnets.
4. An implantable nuclear magnetic resonance spectrometer according to claim 3, wherein the permanent magnet further comprises two ferrite caps closing the external cylindrical magnet and two magneto concentrators located at the adjacent extremity of the two internal cylindrical permanent magnets.
5. An implantable nuclear magnetic resonance spectrometer according to claim 4, wherein the excitation coil is disposed around the catheter traversing the two cylindrical internal permanent magnets, and a preprocessing circuit being disposed adjacent to the at least one excitation coil, the pre-processing circuit detecting and pre-processing the nuclear magnetic resonance signal.
6. An implantable nuclear magnetic resonance spectrometer according to any one of claims 1-5, further comprising a battery disposed within the housing for powering the electronic circuits.
7. An implantable nuclear magnetic resonance spectrometer according to any one of claims 1-6, wherein the housing is encapsulated in a biocompatible material.
8. An apparatus for at least one of measuring the chemical composition of a physiological fluid and for measuring the flow rate of the fluid, comprising: an implantable nuclear magnetic resonance spectrometer having a catheter extending therethrough so that a fluid external to the spectrometer may flow through the catheter to be analyzed; and an external reader having means for communicating with the implantable spectrometer by telemetry.
9. Use of the implantable nuclear magnetic resonance spectrometer according to any one of claims 1-7 for at least one of measuring the chemical composition of a physiological fluid and measuring the flow rate of the fluid.
10. Use of the apparatus according to claim 8 for at least one of measuring the chemical composition of a physiological fluid and measuring the flow rate of the fluid.