System and method for measuring the shape of an organ of a patient using a magnetic induction radio sensor integrated in a stretchable strap

A method of measuring the shape of an object using a magnetic induction radio sensor, the method comprising:

• at least partially enclosing the object with a magnetic loop antenna of the magnetic induction radio sensor, wherein the inductance of the magnetic loop antenna depends on the shape of the object;
• providing a particular capacitance at an antenna matching circuit coupled to the magnetic loop antenna such that the magnetic loop antenna and the antenna matching circuit form a resonant circuit and the resonant circuit has a fixed resonant frequency;
• and
• generating a measurement value using the particular capacitance, the measurement value representing a measurement of the shape of the object,
• wherein the object is an organ of a patient and wherein the magnetic loop antenna is integrated in a stretchable strap that at least partially encloses the organ of the patient.

A magnetic induction radio system configured for measuring the shape of an object, the magnetic induction radio system comprising:

• a magnetic induction radio sensor comprising:
• a magnetic loop antenna configured to at least partially enclose the object, wherein the inductance of the magnetic loop antenna depends on the shape of the object;
• an antenna matching circuit coupled to the magnetic loop antenna, wherein the antenna matching circuit comprises an adjustable capacitance module configured to provide a particular capacitance such that the magnetic loop antenna and the antenna matching circuit form a resonant circuit and the resonant circuit has a fixed resonant frequency;
• a measuring unit configured to generate a measurement value using the particular capacitance of the adjustable capacitance module, the measurement value representing a measurement of the shape of the object;
• and
• a transmitter configured to transmit the generated measurement value using the magnetic loop antenna;
• and
• a remote device configured to receive the transmitted measurement value from the transmitter of the magnetic induction radio sensor,
• wherein the object is an organ of a patient and wherein the magnetic loop antenna is integrated in a stretchable strap that at least partially encloses the organ of the patient.