Surgical robotic user input apparatus having optical fiber-based intrinsic sensors

1. A surgical robotic user input apparatus, comprising:

a fiber optic cable having a plurality of intrinsic sensors therein, a first end with a connector and a second end;

a handheld user input device (handheld UID) attached to the second end of the fiber optic cable, wherein the handheld UID comprises a squeeze bulb having therein a pressure coupling to a pressure sensing one of the plurality of intrinsic sensors; and

the plurality of intrinsic sensors being configured to modify propagating light in the fiber optic cable to detect a pose of the handheld UID, the pose comprising a three-dimensional position of the handheld UID and a rotation of the handheld UID.

2. The surgical robotic user input apparatus of claim 1 , further comprising:

an optical sensing interrogator arranged to couple to the connector of the fiber optic cable.

3. The surgical robotic user input apparatus of claim 1 , wherein the plurality of intrinsic sensors comprises a plurality of fiber Bragg grating sensors.

4. The surgical robotic user input apparatus of claim 1 , wherein the plurality of intrinsic sensors comprises a plurality of interferometric sensors.

5. The surgical robotic user input apparatus of claim 1 , wherein the fiber optic cable comprises:

a first plurality of optical fibers having a first plurality of intrinsic sensors, arranged inline with respect to a longitudinal axis of the fiber optic cable; and

a second plurality of optical fibers having a second plurality of intrinsic sensors, wrapped or woven at a bias with respect to the longitudinal axis of the fiber optic cable.

6. The surgical robotic user input apparatus of claim 1 wherein the fiber optic cable comprises a bundle of single-core optical fibers or a multi-core optical fiber, and wherein the plurality of intrinsic sensors are distributed discretely along a length of the single-core fibers or multi-core optical fiber.

7. The surgical robotic user input apparatus of claim 1 , wherein the handheld UID comprises:

the squeeze bulb having gas, liquid, gel or semisolid material therein;

a diaphragm, piston or plunger within the squeeze bulb and exposed to the gas, liquid, gel or semisolid material; and

a spring-loaded coupling from the diaphragm, piston or plunger to one or more of the plurality of intrinsic sensors, to compress or tension the one or more of the plurality of intrinsic sensors in response to finger or hand pressure on the squeeze bulb.

8. The surgical robotic user input apparatus of claim 1 , wherein the handheld UID and fiber optic cable include no electrical devices and are sterilizable.

9. The surgical robotic user input apparatus of claim 1 , further comprising:

an optical sensing interrogator, arranged to couple to the fiber optic cable and transmit light to the plurality of intrinsic sensors, and to detect light returned from the plurality of intrinsic sensors; and

a programmed processor to determine, based on the detected light, pressure exerted on the handheld UID, the pose of the handheld UID, and ambient temperature changes.

10. The surgical robotic user input apparatus of claim 1 , further comprising:

a touch-sensing device attached to or integrated with the handheld UID.

11. A method of operating a surgical robotic user input apparatus, the method comprising:

sending first light into a fiber optic cable having a plurality of intrinsic sensors;

receiving second light from the fiber optic cable, wherein the second light comprises the first light modified by the plurality of intrinsic sensors; and

determining a pose, comprising a three-dimensional position and a rotation, of a handheld user input device (handheld UID) attached to the fiber optic cable, based on the detected second light, wherein determining the three-dimensional position of the handheld UID is based on differential mode analysis of the first light modified by a first subset of the plurality of intrinsic sensors, wherein the first subset is oriented inline with a longitudinal axis of the fiber optic cable.

12. The method of claim 11 , further comprising:

determining relative pressure or pressure change of the handheld UID, based on the second light received from the fiber optic cable.

13. The method of claim 11 , further comprising:

determining common mode modification of the first light, in the second light; and

determining differential mode modification of the first light, in the second light.

14. The method of claim 11 , further comprising:

determining temperature change, based on detecting common mode modification of the first light, in the second light; and

correcting for thermal drift in readings of the plurality of intrinsic sensors, based on the determined temperature change.

15. The method of claim 11 , further comprising:

determining a shape of one of the plurality of intrinsic sensors, based on detecting differential mode modification of the first light, in the second light, wherein the determining the pose is based on the determining the shape.

16. The method of claim 11 , wherein the determining the pose comprises differential mode analysis of the second light as the first light modified by a plurality of fiber Bragg grating sensors that are a subset of the plurality of intrinsic sensors.

17. The method of claim 11 , wherein the determining the pose comprises differential mode analysis of the second light as the first light modified by a plurality of interferometric sensors that are a subset of the plurality of intrinsic sensors.

18. The method of claim 11 , wherein the determining the pose of the handheld UID comprises:

determining the rotation of the handheld UID based on differential mode analysis of the first light modified by a second subset of the plurality of intrinsic sensors, wherein the second subset is oriented at a bias relative to the longitudinal axis of the fiber optic cable.

19. The method of claim 11 , further comprising:

determining a value of a compression or extension of one of the plurality of intrinsic sensors that is arranged to react to pressure of the handheld UID, through analysis of the first light modified by the intrinsic sensor.

20. The method of claim 11 , further comprising:

sending data regarding the pose of the handheld UID to a robotic controller in a surgical robotics system.