Implantable nuclear magnetic resonance spectrometer

Implantable nuclear magnetic resonance spectrometer contained in ahousing comprising a permanent magnet arrangement (1, 2, 3, 4) for generating a static magnetic field of suitable intensity and homogeneity for analysing a sample of fluid flowinginto a catheter (6) traversing the implant. The implant further comprises an arrangement of electronic circuits (8, 9) responsible for the excitation and detection of the nuclear magnetic resonance signal and at least one coil (7) to expose the fluid sample to the excitation signal and to collect the returned nuclear magnetic resonance signal. The implant also comprises the necessary RF circuits and an antenna (10) for communicating by conventional telemetry with an inductively coupled reader. <IMAGE>