Patent Number: 
Section: claims

1. A device for exchanging an after loader cartridge in an after loader apparatus for treatment of tumours in an animal body, which cartridge is mounted in a receptable opening present in the housing of said after loader apparatus and containing at least one radiation source and a transport wire, wherein said device comprises a radiation shielded housing arranged to brought in an interacting manner with the housing of said after loader apparatus, said radiation shielded housing being provided with a first empty compartment for, in use, receiving said used after loader cartridge mounted in said receptable opening and a second compartment for containing a further cartridge with a new radiation source to be inserted in the, now empty, receptable opening. 2. The exchanging device according to claim 1, wherein said device comprises connection means for connecting the housing of the device to the housing of the after loader apparatus, such that said compartments are adjacent to said receptable opening. 3. The exchanging device according to claim 2, wherein said connection means are arranged for cooperating with corresponding connection means present on the housing of the after loader apparatus for connecting said exchanging device to the after loader apparatus. 4. The exchanging device according to claim 2, wherein both the connection means comprise means for aligning the exchanging device with the receptable opening. 5. The exchanging device according to claim 4, wherein said aligning means comprise alignment sensors present on at least one of the housing of the exchanging device and the housing of the after loader apparatus. 6. The exchanging device according to claim 1, wherein cartridge drive means are present for advancing both used and new cartridge from and in said receptable opening. 7. The exchanging device according to claim 6, wherein said cartridge drive means comprise a connection element to be brought in contact with both used or new cartridge. 8. The exchanging device according to claim 6, wherein said cartridge drive means comprise at least one drivable wheel for advancing both used and new cartridge. 9. The exchanging device according to claim 8, wherein said at least one drivable wheel advances said used and new cartridge by friction. 10. The exchanging device according to claim 9, wherein said at least one drivable wheel is a toothed wheel, which cooperates with a corresponding toothing present on said connection element or said used and new cartridge respectively. 11. The exchanging device according to claim 1, wherein compartment drive means are present for moving each of said two compartments within the device to a position adjacent to said receptable opening. 12. The exchanging device according to claim 1, wherein the wall within the housing separating both of the compartments is made of a radiation shielded material. 13. The exchanging device according to claim 1, wherein the device comprises means, which cooperate with identification means present in both used and new cartridge and intended for identifying the radiation source contained therein, said cooperation means being arranged for a proper recognition, handling and operation of both the used and new cartridge. 14. An exchangeable radiation shielded after loader cartridge for use in an exchanging device as described in claim 1, comprising at least one exchangeable radiation source connected to a first end of a transport cable, which cable is to be connected with its other end to transport means for advancing said transport cable and said radiation source through a guide tube to and from a tumour in said body, wherein for exchanging purposes the cartridge is arranged for corporation with at least one of the cartridge drive means of said exchanging device and said after loader apparatus, wherein said after loader cartridge is provided with a toothing for corporation with a toothed wheel of said cartridge drive means. 15. The apparatus according to claim 14, wherein said apparatus comprises means for moving said receptable opening to a position adjacent to one of said two compartments. 16. The after loader cartridge according to claim 14, wherein said transport means are present in each after loader cartridge. 17. The after loader cartridge according to claim 16, wherein said transport means are part from the radiation shielding of said cartridge. 18. The after loader cartridge according to claim 17, wherein said transport means are made from the same material as the radiation shielding. 19. The after loader cartridge according to claim 14, wherein both used and new cartridge include means for identifying the radiation source contained therein. 20. The after loader cartridge according to claim 19, wherein said identification means comprise an electronic memory, wherein identification parameters are stored. 21. The after loader cartridge according to claim 19, wherein said identification parameters may include information concerning the radiation source, the information being at least one of initial radioactive activity, date of calibration, radioactive half-time, serial numbers, information concerning the transport means, the type of transport cable, and characteristics of the shielding. 22. An after loader apparatus for treatment of tumours in an animal body, said apparatus comprising a housing with at least one exchangeable radiation source connected to a first end of a transport cable, the cable being connected with its other end to transport means for advancing said transport cable and said radiation source through a guide tube to and from a tumour in said body, where at least the radiation source and the transport cable are mounted in an exchangeable radiation shielded after loader cartridge, the cartridge is placeable in a suitable receptable opening present in said housing, wherein for exchanging said radiation source after use of the after loader apparatus is arranged for corporation with an exchanging device as described in claim 1, further comprising connection means present on the housing of the apparatus, which is cooperatable with corresponding connection means present on said exchanging device for connecting said apparatus to said exchanging device. 23. The apparatus according to claim 22, wherein said connection means are mounted around said receptable opening. 24. The apparatus according to claim 22, wherein the connection means comprise means for aligning the exchanging device with the receptable opening. 25. The apparatus according to claim 24, wherein said aligning means comprise alignment sensors present on the housing of the apparatus. 26. The apparatus according to claim 22, wherein said apparatus comprise cartridge drive means for advancing both used and new cartridge from and in said receptable opening. 27. The apparatus according to claim 26, wherein said cartridge drive means comprise a connection element to be brought in contact with both used and new cartridge. 28. The apparatus according to claim 26, wherein said cartridge drive means comprise at least one drivable wheel for advancing both used and new cartridge. 29. The apparatus according to claim 28, wherein said at least one drivable wheel advances said used and new cartridge by friction. 30. The apparatus according to claim 28, wherein said at least one drivable wheel is a toothed wheel, which cooperates with a corresponding toothing present on said used and new cartridge. 31. An exchangeable radiation shielded after loader cartridge for use in an after loader apparatus as described in claim 22, comprising at least one exchangeable radiation source connected to a first end of a transport cable, which cable is to be connected with its other end to transport means for advancing said transport cable and said radiation source through a guide tube to and from a tumour in said body, wherein for exchanging purposes the cartridge is arranged for corporation with at least one of the cartridge drive means of said exchanging device and said after loader apparatus, wherein said after loader cartridge is provided with a toothing for corporation with a toothed wheel of said cartridge drive means. 32. The after loader cartridge according to claim 31, wherein said transport means are present in each after loader cartridge. 33. The after loader cartridge according to claim 32, wherein said transport means are part from the radiation shielding of said cartridge. 34. The after loader cartridge according to claim 33, wherein said transport means are made from the same material as the radiation shielding. 35. The after loader cartridge according to claim 31, wherein both used and new cartridge include means for identifying the radiation source contained therein. 36. The after loader cartridge according to claim 35, wherein said identification means comprise an electronic memory, wherein identification parameters are stored. 37. The after loader cartridge according to claim 35, wherein said identification parameters may include information concerning the radiation source, the information being at least one of initial radioactive activity, date of calibration, radioactive half-time, serial numbers, information concerning the transport means, the type of transport cable, and characteristics of the shielding.