Two-stage calibration of medical probes

A method for performing an invasive medical procedure, comprising:

• providing a probe, having a proximal end and a distal end, which comprises a sensor, which outputs a sensor signal, a first microcircuit, which stores first calibration data with respect to the sensor, and a first connector at, the proximal end of the probe, electrically coupled at least to the sensor;
• connecting the first connector of the probe to a second connector of a probe adapter, which comprises a signal processing circuit, which is coupled to process the sensor signal so as to output a processed signal, and a second microcircuit, which stores second calibration data with respect to the signal processing circuit, and a third connector, electrically coupled at least to the signal processing circuit;
• using a microcontroller in the adapter, reading the first and second calibration data from the first and second microcircuits, respectively, and computing combined calibration data based on the first and second calibration data;
• connecting the:
• third connector of the adapter to a fourth connector of a console, which comprises signal analysis circuitry;
• inserting the probe into a body of a subject;
• and
• using the signal analysis circuitry, receiving via the fourth connector at least the processed signal from the adapter and analyzing the processed signal using the combined calibration data provided by the probe adapter while the probe is in the body.