The invention relates to a system for surgical treatment, in particular for endovenous laser therapy, comprising a laser device (1) and an application module (200), wherein the laser device (1) has a laser light source (11) with at least one first laser diode element and the application module (200) is/can be optically connected to the laser light source (11), wherein the first laser diode element has at least one semiconductor layer made of an antimony compound, as is configured in such a way that laser light can be generated having a first wavelength between 1800 nm and 2200 nm, in particular 1940 nm. The invention is characterised in that the application module (200) is designed as a flexible catheter (20) with an optical waveguide, which has an RFID chip with a parameter and/or clearance coding, wherein the laser device (1) has a controller (13) with an RFID transmitter and receiver unit for reading and describing the RFID chip, and the controller (13) is configured in such a way that an activation of the laser light source (11) occurs according to the detection of a predetermined parameter and/or clearance coding by the RFID receiver unit, and a time stamp is stored on the RFID chip for the invalidation of the catheter.
