Surgical cannulas and related systems and methods of identifying surgical cannulas

1. A teleoperable medical system comprising:

a manipulator arm comprising an interface configured to operably couple with a medical instrument;

a cannula mount coupled to the manipulator arm and configured to removably mount a cannula to the manipulator arm in a position to permit removable insertion of the medical instrument through the cannula, the cannula mount comprising:

a receptacle configured to receive an attachment portion of the cannula in a mounted state of the cannula; and

a reader positioned to be in magnetic field sensing proximity to the attachment portion of the cannula in the mounted state of the cannula; and

a controller configured to receive output signals from the reader and determine identification information about the cannula based on the output signals,

wherein the reader is positioned to be in magnetic field sensing proximity to a plurality of encoding positions of the attachment portion of the cannula in the mounted state of the cannula, each encoding position of the plurality of encoding positions indicating part of the identification information.

2. The teleoperable medical system of claim 1 , wherein:

the reader comprises a plurality of sensors positioned to be in magnetic field sensing proximity to respectively corresponding encoding positions of the plurality of encoding positions.

3. The teleoperable medical system of claim 2 , wherein:

the plurality of sensors comprise magnet presence sensors, each magnet presence sensor configured to sense for magnet presence at a corresponding encoding position of the plurality of encoding positions.

4. The teleoperable medical system of claim 2 , wherein:

the plurality of sensors comprise magnetic field polarity sensors, each magnetic field polarity sensor configured to sense for magnet orientation at a corresponding encoding position of the plurality of encoding positions.

5. The teleoperable medical system of claim 2 , wherein:

the plurality of sensors are arranged in a planar array.

6. The teleoperable medical system of claim 2 , wherein:

the plurality of sensors comprise a plurality of sensor groups, each sensor group of the plurality of sensor groups comprising two sensors of the plurality of sensors that are positioned in magnetic field sensing proximity to the same encoding position of the plurality of encoding positions in the mounted state of the cannula.

7. The teleoperable medical system of claim 6 , wherein:

the plurality of sensor groups are arranged in a planar array.

8. The teleoperable medical system of claim 6 , wherein:

each sensor group of the plurality of sensor groups comprises a magnet presence sensor and a magnetic field polarity sensor.

9. The teleoperable medical system of claim 1 , wherein:

the receptacle has a non-circular cross-section.

10. The teleoperable medical system of claim 1 , wherein:

the receptacle is configured to receive the attachment portion via insertion of the attachment portion in a first direction that is generally perpendicular to a second direction of insertion of the medical instrument through the cannula.

11. A teleoperable medical system comprising:

a manipulator arm comprising an interface configured to operably couple with a medical instrument;

a cannula mount coupled to the manipulator arm and configured to removably mount a cannula to the manipulator arm in a position to permit removable insertion of the medical instrument through the cannula, the cannula mount comprising:

a receptacle configured to receive an attachment portion of the cannula in a mounted state of the cannula; and

a reader positioned to be in magnetic field sensing proximity to the attachment portion of the cannula in the mounted state of the cannula; and

a controller configured to receive output signals from the reader and determine identification information about the cannula based on the output signals,

wherein the reader is positioned at an interior face of the receptacle that faces an exterior face of the attachment portion in a mounted position of the cannula.

12. The teleoperable medical system of claim 11 , wherein:

the interior face of the receptacle faces proximally and the exterior face of the attachment portion faces distally in the mounted state of the cannula.

13. A cannula for insertion of a medical instrument, the cannula comprising:

a tube portion; and

an attachment portion coupled to the tube portion and insertable into a receptacle of a cannula mount to mount the cannula in a position to permit removable insertion of the medical instrument through the tube portion,

wherein the attachment portion comprises one or more magnets arranged to encode identifying information of the cannula,

wherein the medical instrument is removably insertable through the tube portion along a first direction, and

wherein the attachment portion is insertable into the receptacle in a second direction nonparallel to the first direction.

14. The cannula of claim 13 , further comprising:

a bowl portion coupled to the tube portion, the attachment portion protruding in a radial direction from a side of the bowl portion.

15. The cannula of claim 13 , wherein:

the tube portion extends along a distal direction away from the attachment portion, and

the one or more magnets are located at a face of the attachment portion that faces in the distal direction.

16. The cannula of claim 13 , wherein:

the attachment portion comprises a recessed portion;

the one or more magnets are located at the recessed portion; and

a non-magnetic cover at least partially covers the recessed portion.

17. The cannula of claim 13 , wherein:

the one or more magnets at least partially project from a surface of the attachment portion.

18. A cannula for insertion of a medical instrument, the cannula comprising:

a tube portion; and

an attachment portion coupled to the tube portion and insertable into a receptacle of a cannula mount to mount the cannula in a position to permit removable insertion of the medical instrument through the tube portion,

wherein the attachment portion comprises one or more magnets arranged to encode identifying information of the cannula,

wherein the attachment portion comprise a plurality of encoding positions that each indicate part of the identifying information; and

wherein for each encoding position of the plurality of encoding positions, absence of one of the one or more magnets at the respective encoding position indicates a first value and presence of one of the one of the magnets at the respective encoding position indicates a second value.

19. The cannula of claim 13 , wherein:

the attachment portion comprise a plurality of encoding positions that each indicate part of the identifying information; and for each encoding position of the plurality of encoding positions, absence of one of the one or more magnets at the respective encoding position indicates a first value, presence of one of the one of the magnets with a first orientation at the respective encoding position indicates a second value, and presence of one of the one of the magnets with a second orientation at the respective encoding position indicates a third value.

20. The cannula of claim 13 , wherein:

the identifying information of the cannula comprises information indicative of parameters of the cannula; and

the attachment portion comprises a plurality of encoding positions, with each encoding position of the plurality of encoding positions indicating one of the parameters of the cannula at least by presence or absence of one of the magnets at the respective encoding position.

21. The cannula of claim 13 , wherein:

the identifying information of the cannula comprises an identifier comprising a series of characters; and

the attachment portion comprise a plurality of encoding positions, with each encoding position of the plurality of encoding positions indicating one of the characters of the identifier at least by presence or absence of one of the magnets at the respective encoding position.

22. A method of manufacturing a cannula for use in a teleoperable medical system, comprising:

providing a cannula body comprising:

a tube portion; and

an attachment portion coupled to the tube portion and insertable into a receptacle of a cannula mount of the teleoperable medical system to mount the cannula in a position to permit removable insertion of a medical instrument through the tube portion; and

encoding identifying information of the cannula by arranging one or more magnets at the attachment portion,

wherein encoding the identifying information of the cannula comprises arranging the one or more magnets in a plurality of encoding positions at the attachment portion, and

wherein each encoding position of the plurality of encoding positions indicates a part of the identifying information at least in part by magnet presence or magnet absence at the respective encoding position.

23. The method of claim 22 , wherein:

encoding the identifying information of the cannula comprises:

encoding a first value at a first encoding position of the plurality of encoding positions by omitting a magnet at the first encoding position;

encoding a second value at a second encoding position of the plurality of encoding positions by providing one of the one or more magnets with a first orientation at the second encoding position; and

encoding a third value at a third encoding position of the plurality of encoding positions by providing one of the one or more magnets with a second orientation at the third encoding position.

24. The method of claim 22 , wherein:

each encoding position of the plurality of encoding positions is located so as to be within sensing proximity to a respectively corresponding sensor of the teleoperable medical system in the position of the cannula mounted at the cannula mount.