Method for monitoring sensor degradation, patient monitor, patient monitor system, physiological sensor, and computer program product for a patient monitor

A patient monitor system for monitoring a subject, the monitor system comprising:

• a memory storing history data for at least one sensor feature parameter, wherein the history data is indicative of past characteristics of a physiological sensor;
• a data retrieval unit configured to retrieve the history data from the memory when the physiological sensor is connected to a patient monitor;
• and
• a degradation determination unit configured to determine, based on the history data, a degradation measure for the physiological sensor, wherein the degradation measure is indicative of a degree of degradation of the physiological sensor.

A physiological sensor attachable to a subject for acquiring a physiological measurement signal from the subject, the physiological sensor comprising:

• a sensor element unit configured to output an electrophysiological signal;
• a sensor memory storing history data for at least one sensor feature parameter, wherein the history data is indicative of past characteristics of a physiological sensor;
• and
• a memory access interface for enabling a patient monitor operably connected to the sensor to retrieve the history data for determination of a degradation measure for the physiological sensor, wherein the degradation measure is indicative of degree of degradation of the physiological sensor.