Magneto-mechanical resonators with reduced mutual attraction

A system for monitoring and/or diagnosing the transit through the gastro-intestinal tract of a mammal, such as a human, comprising sensing device and a sensing system, wherein the sensing device comprises a casing;

• and
• a first magnetic object with a permanent magnetic moment, wherein the first magnetic object is coupled to the casing in such a way, that it is configured for oscillating around an equilibrium position when excited by a magnetic or an electromagnetic excitation field;
• and
• wherein the sensing device comprises a second magnetic object configured for providing a restoring force to the first magnetic object
• wherein a distance from a center of the first magnetic object to an outer surface of the casing is at least equal to a diameter of the first magnetic object, the said distance equals at least twice of the diameter of the first magnetic object,
• and wherein the tracking system comprises at least one coil for generating the magnetic or electromagnetic excitation field configured for detecting the magnetic response field generated by the sensing device and a controller for controlling the coil system configured for determining whether the presence of a sensing device in a target detection space.