A system and method for controlling lighting are described. Space information of the sensor elements is extracted from the induced current information, and the bend shape of the catheter is calculated according to aforementioned space information in combination with characteristic information of the catheter. The sensor also has an evaluation circuit which is connected downstream of the sensor electrode and is intended to process a reception signal generated in the sensor electrode. The hollow base ring is attached to the locking ring. If an irregularity is found during the verification or crosscheck, or if the identification card is found to be invalid or expired, the person is prevented or obstructed from negotiating that or any subsequent transaction with any other person, group or entity in the population.