Systems and methods for magnetic sensing and docking with a trocar

1. A surgical robotic system, comprising: a robotic arm having a plurality of actuators; a tool drive coupled to a distal end of the robotic arm, the tool drive comprising a docking interface to receive a trocar; one or more sensors operable to sense a magnetic field generated by the trocar wherein the one or more sensors are coupled to the docking interface of the tool drive and the magnetic field is generated by a plurality of magnets embedded in the trocar; and one or more processors configured to: determine a position and an orientation of the trocar based on the sensed magnetic field, and drive the plurality of actuators to orient the docking interface to the determined orientation of the trocar, and guide the robotic arm toward the determined position of the trocar.

2. The surgical robotic system of claim 1 , wherein the one or more processors are configured to guide the robotic arm by automatically controlling the plurality of actuators to drive the arm toward the determined position of the trocar.

3. The surgical robotic system of claim 1 , wherein the one or more processors are configured to guide the robotic arm by automatically controlling the plurality of actuators to assist a user who is manually guiding the robotic arm toward the determined position of the trocar.

4. The surgical robotic system of claim 1 , wherein when the robotic arm is manually guided by a user toward the determined position of the trocar, the one or more processors are configured to control the plurality of actuators so as to resist the user's manual guidance of the robotic arm when the user's manual guidance is directing the robotic arm away from the determined position of the trocar.

5. The surgical robotic system of claim 1 , wherein the docking interface defines a chamber, and one or more clamp components are disposed in the chamber.

6. The surgical robotic system of claim 5 , wherein the one or more clamp components is movably coupled to the docking interface and configured to move to secure an attachment portion of the trocar to the docking interface.

7. The surgical robotic system of claim 6 , wherein the attachment portion of the trocar is a protrusion extending from an upper portion of the trocar.

8. The surgical robotic system of claim 6 , further comprising a lever positioned on the docking interface, and wherein movement of the lever causes movement of the one or more clamp components.

9. The surgical robotic system of claim 8 , further comprising a switch mounted on the docking interface that, when actuated, signals the one or more processors to determine the position and orientation of the trocar based on the sensed magnetic field and guide the robotic arm to dock with the trocar.

10. The surgical robotic system of claim 9 , wherein the switch is positioned such that movement of the lever actuates the switch.

11. The surgical robotic system of claim 1 , wherein the one or more sensors is a plurality of sensors in a chamber of the docking interface.

12. The surgical robotic system of claim 11 , wherein the plurality of sensors in the chamber of the docking interface comprises at least three sensors positioned at respective different depths measured from a frontal opening of the docking interface.

13. The surgical robotic system of claim 1 , wherein the one or more sensors comprises a first plurality of sensors coupled to a first sensor board and a second plurality of sensors coupled to a second sensor board, the first sensor board and the second sensor board are on opposite sides of a chamber of the docking interface.

14. The surgical robotic system of claim 1 wherein the one or more processors are configured to guide the robotic arm by guiding the docking interface toward the trocar until an attachment portion of the trocar is at least partially disposed in a chamber of the docking interface, wherein the attachment portion of the trocar is a protrusion extending from an upper portion of the trocar.

15. The surgical robotic system of claim 14 , wherein guiding the docking interface comprises automatically re-orienting the docking interface by the plurality of actuators in the robotic arm controlled by the one or more processors.

16. The surgical robotic system of claim 1 , wherein the docking interface comprises a lever operable to lock the trocar to the docking interface, and a switch mounted on the docking interface and communicatively coupled to the one or more processors.

17. The surgical robotic system of claim 16 , wherein method further comprises:

the one or more processors responding to the lever moving in one direction into contact with the switch, by processing a measured sensor reading; and

locking the docking interface to the trocar in response to the lever moving in another direction.

18. A method performed by a surgical robotic system, the method comprising: determining a position and an orientation of a trocar based on a sensed magnetic field, wherein the magnetic field is generated by a plurality of magnets embedded in the trocar and sensed by one or more sensors that are coupled to a docking interface of a tool drive that is coupled to a robotic arm; driving a plurality of actuators of the robotic arm to orient the docking interface of the tool drive that is coupled to the robotic arm, wherein the docking interface is oriented to the determined orientation of the trocar; and guiding the robotic arm toward the determined position of the trocar.

19. The method of claim 18 , wherein guiding the robotic arm comprises automatically controlling the plurality of actuators to drive the robotic arm toward the determined position of the trocar.

20. The method of claim 18 , wherein guiding the robotic arm comprises automatically controlling the plurality of actuators to assist a user who is manually guiding the robotic arm toward the determined position of the trocar.