Invasive temperature sensor system

A device for measuring a temperature at one or more locations in an organ or tissue inside the human or animal body, the device comprising:

• a catheter tube having a distal end and a proximal end, in which the distal end is adapted for inserting into the body in or on the organ or tissue while the proximal end is adapted for remaining outside the body in use of the device,
• a plurality of resistive temperature sensors in the tube,
• a plurality of electrical wires in the tube that are connected to the plurality of resistive temperature sensors, and
• a connector, at the proximal end of the tube, for electrically connecting the at least some of the plurality of electrical wires to an external device,
• wherein each of said resistive temperature sensors comprises a thermal resistor and a first terminal and a second terminal between which a temperature dependent resistance of the thermal resistor can be measured, wherein each of the two terminals of the resistive temperature sensor is directly connected to at least one of said plurality of electrical wires, and wherein a number of the plurality of electrical wires in the tube is n+3 wires for n sensors in the tube.