Temperature sensor, temperature measuring device and medical engineering systems comprising a temperature sensor or a temperature measuring device

A medical engineering system comprising at least one temperature sensor comprising a sensor element including a medium showing luminescence upon excitation, the medium showing luminescence upon excitation being a crystal, the at least one temperature sensor also comprising a light conductor which is optically connected to the sensor element and is intended for supplying the crystal with light having an excitation wavelength and/or for receiving and discharging light having a luminescence wavelength of the crystal, the medical engineering system being implemented as a surgical system, wherein the surgical system comprises a device for cutting, dissection, coagulation, sealing and/or connecting tissue structures of a patient, the device comprising an applicator tool with two applicator elements in the form of applicator jaws which can be moved relative to each other and can be transferred from an open resting position to a closed working position, the at least one temperature sensor being arranged in at least one of the applicator elements, said at least one of the applicator elements comprising at least one spacer which keeps the applicator elements in the working position at a predefined distance relative to each other, the at least one spacer forming the at least one temperature sensor, wherein the applicator jaws each extend in a longitudinal direction, and wherein the light conductor of the at least one temperature sensor extends inside one of the applicator jaws in the longitudinal direction.