Surgical tables

1. A surgical table comprising:

a base comprising a chassis and rotatably connected to the chassis a plurality of wheels for supporting the surgical table on a floor, wherein a total number of the plurality of wheels for supporting the surgical table on the floor is only four, a first of the four wheels being driven and comprised in a swivel castor rotatably connected to the chassis;

a column extending from the chassis;

a tabletop coupled to the column and providing a patient support surface, the tabletop having a longitudinal direction; and

a drive system for causing a rotation of the first wheel relative to the chassis thereby to drive the surgical table along the floor,

wherein the swivel castor comprises a frame rotatably connected to the chassis for free rotation about 360 degrees about a first axis relative to the chassis, wherein an orientation of the frame is lockable relative to the chassis with the first wheel being longitudinally oriented relative to the longitudinal direction of the tabletop, and the first wheel rotatably connected to the frame about a second axis orthogonal to the first axis and comprising an integral electric motor, and wherein the chassis has first and second opposed end portions, wherein the four wheels consist of the first wheel at the first end portion, a second wheel comprised in a second swivel castor at the first end portion, wherein the second swivel castor is not driven, and third and fourth wheels at the second end portion.

2. The surgical table according to claim 1 , wherein the third and fourth wheels are comprised in respective third and fourth swivel castors.

3. The surgical table according to claim 1 , wherein the third and fourth wheels are third and fourth fixed wheels.

4. The surgical table according to claim 1 , comprising a handlebar at one end of the tabletop, wherein the drive system comprises a selector mounted on the handlebar for selecting a speed at which the drive system rotates the first wheel.

5. The surgical table according to claim 4 , wherein the selector is disposable in first and second modes, and wherein the drive system is for causing the rotation in dependence on the mode of the selector.

6. The surgical table according to claim 4 , wherein with respect to the longitudinal direction of the tabletop, the handlebar is at one longitudinal end of the tabletop, and/or wherein the handlebar is removably fixed to the tabletop.

7. The surgical table according to claim 6 , wherein the tabletop has a transverse direction orthogonal to the longitudinal direction, and at least a portion of the handlebar is elongate in the transverse direction.

8. The surgical table according to claim 5 , wherein the drive system is configured to not cause the rotation when the selector is in the first mode.

9. The surgical table according to claim 5 , wherein the drive system is configured to cause the rotation when the selector is in the second mode.

10. The surgical table according to claim 4 , wherein the selector is for selecting a direction in which the drive system rotates the first wheel.

11. The surgical table according to claim 1 , wherein the drive system comprises a dead man's switch that is switchable between first and second states and biased to the first state, and the drive system is for causing the rotation in dependence on the state of the dead man's switch.

12. The surgical table according to claim 11 , wherein the drive system is configured to not cause the rotation when the dead man's switch is in the first state.

13. The surgical table according to claim 11 , wherein the drive system is for causing the rotation only when the dead man's switch is in the second state.

14. The surgical table according to claim 11 , wherein the selector is disposable in first and second modes, the drive system is for causing the rotation in dependence on the mode of the selector, and the drive system is configured to cause the rotation when the selector in the second mode only when the dead man's switch is in the second state.

15. The surgical table according to claim 11 , comprising a handlebar at one end of the tabletop, wherein the drive system comprises a selector mounted on the handlebar for selecting a speed at which the drive system rotates the first wheel and wherein the dead man's switch is mounted on the handlebar.