Patient support system
Embodiments of the invention thus define a system and methods for moving a patient into a medical treatment/imaging apparatus. By appropriate use of relatively narrow guides, a bed can be held securely both prior to movement onto the apparatus and while on the apparatus. By use of relatively wide guides, the bed is allowed a degree of lateral play to ensure a smooth transition on to the apparatus.
1. A system for moving a patient on to a medical apparatus, comprising;
a patient support, comprising a first plurality of pairs of guides, each pair comprising a first guide on one edge of the patient support and a second guide at a corresponding position on an opposite edge of the patient support;
a table of the medical apparatus, comprising a second plurality of pairs of guides, each pair comprising a first guide on one edge of the table and a second guide at a corresponding location on an opposite edge of the table; and
a bed, movable in a longitudinal direction from the patient support to the table, between the first and second guides of the first plurality of pairs of guides and between the first and second guides of the second plurality of pairs of guides;
wherein a first spacing between a first guide and a second guide of a pair of the first plurality of pairs of guides is greater than a second spacing between a first guide and a second guide of a pair of the second plurality of pairs of guides, and
wherein the second spacing is such that when the bed is positioned on the table no movement of the bed is allowed in a lateral direction transverse to the longitudinal direction.
2. The system according to claim I, wherein a first particular pair of the first plurality of pairs of guides is positioned at a first displacement from an upper surface of the patient support, and wherein at least one other pair of the first plurality of pairs of guides is positioned at a second, different displacement from the upper surface of the patient support.
3. The system according to claim 2 , wherein the bed comprises one or more protrusions at a height corresponding to the first displacement and not the second displacement.
4. The system according to claim 3 , wherein the spacing between the first and second guides of the first particular pair of guides is such that when the bed is positioned on the patient support the first and second guides of the first particular pair of guides engage with the one or more protrusions and no movement of the bed is allowed in a direction transverse to the longitudinal direction.
5. The system according to claim 1 , wherein a second particular pair of the first plurality of pairs of guides has a separation equal to the second spacing.
6. The system according to claim 2 , wherein a second particular pair of the first plurality of pairs of guides has a separation equal to the second spacing.
7. The system according to claim 6 , wherein the first and second particular pairs of the first plurality of pairs of guides are positioned at opposite ends of the patient support.
8. The system according to claim 1 , wherein one or more of the first and second guides of one or more pairs of guides of the first or second pluralities of pairs of guides is biased in a direction transverse to the longitudinal direction of the bed.
9. The system according to claim 1 , wherein the table comprises a treatment volume.
10. The system according to claim 9 wherein at least two pairs of the second plurality of pairs of guides are positioned between an end of the treatment table and the treatment volume.
11. The system according to claim 1 , wherein the guides comprise rollers.
12. The system according to claim 1 , wherein the medical apparatus comprises a radiotherapy system.
13. The system according to claim 1 , wherein the medical apparatus comprises an MRI system, and the table is positioned within a magnetic coil of the MRI system.