Device for the extracorporeal controlling of the temperature of patients by transmitting heat between a fluid and a transmission medium, having a primary circuit having a primary unit (102, 201) for receiving the fluid, and a secondary circuit having a secondary unit (104, 200) which includes connectors (240, 242) for infeeding and outfeeding the transmission medium, wherein the secondary unit (104, 200) is capable of being fastened to the primary unit (102, 201) and has nozzles (206) for configuring an impingement flow, said nozzles (206), in the case of a secondary unit (104, 200) being fastened to the primary unit (102, 201), being directed in the direction of the primary unit (102, 201).
