Modular patient support system for use in radiotherapy treatments

1. Modular patient support system having a radiotransparent structure for use in radiotherapy treatments, the system comprising a basic portion to be mounted fixedly and an exchangeable radiotransparent modular portion, said basic portion to be mounted fixedly being provided with a radiotransparent supporting part for supporting the exchangeable modular portion and means for positioning said modular portion in relation to the basic portion and for coupling it to said basic portion to be fixedly mounted, wherein the modular portion and the basic portion are provided with positioning means and means for having said modular portion engage said fixed basic portion by a snap connection.

2. Modular system according to claim 1 , characterized in that the radiotransparent supporting part of the fixed basic portion substantially comprises spaced-apart arms extending in longitudinal direction of said basic portion having its extreme ends connected to one another through a connecting part.

3. Modular system according to claim 2 , characterized in that the arms of the radiotransparent supporting part substantially consist of tubular sleeves with bottom and top sides thereof comprising a hybrid structure having one directional carbon fibres and cross-woven carbon fibres and at least one side having across at least a part of its length a core of foam material with a layer of cross-woven carbon fibres on each side of the core of foam material.

4. Modular patient support system having a radiotransparent structure for use in radiotherapy treatments, said system comprising a fixed basic portion, an exchangeable radiotransparent supporting element for supporting a patient and means for positioning said supporting element in respect to said basic portion, said basic portion comprising spaced apart arms extending in a longitudinal direction thereof for supporting a part of said exchangeable radiotransparent supporting element, said arms having extreme ends that are connected to one another by a connecting element, said arms comprising tubular sleeves with bottom and top sides thereof comprising a hybrid structure having uni-directional carbon fibers and cross-woven carbon fibers and at least one side having across at least a part of its length a core of foam material with a layer of cross-woven carbon fibers on each side of the core of foam material, and means for removably and fixedly connecting said support element to said basic portion.

5. Modular system according to claim 4 , wherein the tubular sleeves, seen in cross-section, become narrower from the upwardly situated plane of contact with the supporting element downwards.

6. Modular system according to claim 5 , characterized in that the tubular sleeves have an obliquely extending plane at the outwardly facing sides.

7. Modular system according to claim 6 , characterized in that the connecting part by which the extreme ends of the tubular sleeves are connected to one another substantially comprises a structure having carbon fibres and constitutes an entity with the tubular sleeves.

8. Modular system according to claim 7 , characterized in that the connecting part, seen in cross-section, has a vertical size which is many times greater than the thickness of the connecting part.

9. Modular system according to claim 4 , wherein the supporting element and the basic portion are provided with positioning means and means for having said supporting element engage said fixed basic portion by a snap connection.

10. Modular system according to claim 9 , characterized in that the first positioning means comprise one or more slides mounted on an extreme end of the supporting element and openings corresponding for receiving pins in an extreme end of the fixed basic portion.

11. Modular system according to claim 10 , characterized in that the slides are provided with setting means for setting the support element in a desired position in relation to the fixed basic portion.

12. Modular system according to claim 9 , characterized in that second positioning means comprise one or more pins mounted on the supporting element, said pins being made of a radiotransparent material, and holes for receiving the pins in said fixed basic portion.

13. Modular system according to claim 12 , characterized in that the pins constitute an entity with the supporting element.

14. Modular system according to claim 12 , characterized in that the holes for receiving the pins are constituted by bushings mounted in the connecting part, by which the extreme ends of the tubular sleeves are connected to one another, said bushings continuing into the tubular sleeves.

15. Modular system according to claim 14 , characterized in that each bushing constitutes an entity with the connecting part and a tubular sleeve.

16. Modular system according to claim 9 , characterized in that one or more snap connection members are provided between the modular portion and the fixed basic portion.

17. Modular system according to claim 16 , characterized in that the snap connection members are mounted on the extreme ends of the slides of said first positioning means.

18. Modular system according to claim 4 , characterized in that the fixed basic portion is provided with positioning means for positioning the fixed basic portion on an adjustable table.