The present invention relates to an adapter (100) for coupling with a medical coupling unit (1) and a medical sensor (2) that are configured for being coupled for electrical signal transmission between them. The adapter comprises an adapter coupling unit (101) configured to fit with a coupling-side connector (10) of the medical coupling unit (1) and including a plurality of coupling-side electrical contacts (111, 113) for contacting a plurality of electrical contacts (11, 13) of the coupling-side connector (10) and a sensor-side connector (120) configured to fit with a sensor-side connector (20) of the medical sensor (2) and including a plurality of sensor-side electrical contacts (121, 123) for contacting a plurality of electrical contacts (21, 23) of the sensor-side connector (20), allowing the adapter coupling unit (101) to be mechanically coupled between the medical coupling unit (1) and the medical sensor (2). Further, the adapter comprises one or more wires (102) fixedly connected to the adapter coupling unit for coupling one or more sensor elements (225) with the adapter coupling unit for electrical signal transmission from the one or more sensor elements to the adapter coupling unit, and connection circuitry (103) within the adapter coupling unit (101) for connecting said sensor-side electrical contacts (121, 123) and said one or more wires (102) with said coupling-side electrical contacts (111, 113) allowing signal transmission from the medical sensor (2) and one or more sensor elements (225) coupled to the adapter coupling unit (101) to the medical coupling unit (1).