Steering assembly for surgical robot

1. A surgical robot, comprising:

a robotic arm;

a cart supporting the robotic arm and comprising a steering assembly;

wherein:

the steering assembly comprises wheels and a handle;

the handle is moveable to a first position, a second position, and a third position; and

the steering assembly is configured such that:

when the handle is in the first position, the wheels allow the cart to roll in a longitudinal direction;

when the handle is in the second position, the wheels allow the cart to roll in a rotational direction; and

when the handle is in the third position, the wheels allow the cart to roll in a lateral direction.

2. The surgical robot of claim 1 , wherein the steering assembly is configured such that:

when the handle is in the first position, the wheels are parallel with a longitudinal axis of the cart;

when the handle is in the second position, the wheels are angled relative to the longitudinal axis of the cart; and

when the handle is in the third position, the wheels are perpendicular to the longitudinal axis of the cart.

3. The surgical robot of claim 1 , wherein the wheels are nonparallel when the handle is in the second position.

4. The surgical robot of claim 1 , wherein:

the steering assembly further comprises a shaft;

the handle is coupled to the shaft; and

the handle is rotatable about an axis of the shaft to move between the first position, the second position, and the third position.

5. The surgical robot of claim 4 , further comprising an indexer coupled to the shaft and configured to provide tactile feedback when the handle reaches the first position, the second position, and the third position.

6. The surgical robot of claim 5 , wherein the indexer is configured to resist movement of the handle out of the first position, the second position, and the third position.

7. The surgical robot of claim 1 , wherein the cart further comprises an additional wheel, wherein the additional wheel is free to rotate about a vertical axis of the additional wheel.

8. A surgical cart, comprising:

a body; and

a steering assembly coupled to the body, the steering assembly comprising wheels and a handle, wherein:

the handle is moveable to a first position, a second position, and a third position; and

the steering assembly is configured such that:

when the handle is in the first position, the wheels allow the surgical cart to roll in a longitudinal direction;

when the handle is in the second position, the wheels allow the surgical cart to roll in a rotational direction; and

when the handle is in the third position, the wheels allow the surgical cart to roll in a lateral direction.

9. The surgical cart of claim 8 , wherein the steering assembly is configured such that:

when the handle is in the first position, the wheels are parallel with a longitudinal axis of the surgical cart;

when the handle is in the second position, the wheels are angled relative to the longitudinal axis of the surgical cart; and

when the handle is in the third position, the wheels are perpendicular to the longitudinal axis of the surgical cart.

10. The surgical cart of claim 8 , wherein the wheels are nonparallel when the handle is in the second position.

11. The surgical cart of claim 8 , wherein:

the steering assembly further comprises a shaft;

the handle is coupled to the shaft; and

the handle is rotatable about an axis of the shaft to move between the first position, the second position, and the third position.

12. The surgical cart of claim 11 , further comprising an indexer coupled to the shaft and configured to provide tactile feedback when the handle reaches the first position, the second position, and the third position.

13. The surgical cart of claim 12 , wherein the indexer is configured to resist movement of the handle out of the first position, the second position, and the third position.

14. The surgical cart of claim 8 , further comprising an additional wheel coupled to the body and free to rotate about a vertical axes of the additional wheel.

15. A steering assembly for a surgical cart, comprising:

a shaft;

a handle coupled to the shaft and moveable to a first position and a second position; and

wheels operably connected to the handle via the shaft such that:

when the handle is in the first position, the wheels allow the surgical cart to roll in a first direction, wherein the first direction is a longitudinal direction, a lateral direction, or a rotational direction;

when the handle is in the second position, the wheels allow the surgical cart to roll in a second direction different than the first direction, wherein the second direction is the longitudinal direction, the lateral direction, or the rotational direction.

16. The steering assembly of claim 15 , wherein the second direction is the rotational direction and the wheels are nonparallel when the handle is in the second position.

17. The steering assembly of claim 16 , wherein the first position is the longitudinal direction or the lateral direction and the wheels are parallel when the handle is in the first position.

18. The steering assembly of claim 15 , wherein the handle is rotatable about an axis of the shaft to move from the first position to the second position.

19. The steering assembly of claim 15 , wherein the handle is further moveable to a third position and wherein, when the handle is in the third position, the wheels allow the surgical cart to roll in a third direction different than the first direction and the second direction.

20. The steering assembly of claim 19 , wherein the first direction is the longitudinal direction, the second direction is the rotational direction, and the third direction is the lateral direction.