IP Library › Granted Patent US 12,239,388
Granted Patent B2
US 12,239,388 · App. 17/699,825 · Granted Mar 4, 2025

Camera tracking bar for computer assisted navigation during surgery

Inventors: Thomas Calloway (Pelham, NH); Leonid Naimark (Lynn, MA)
Assignee: Globus Medical, Inc.
A61B34/20A61B34/25A61B90/37G06T7/285G06T7/292G10L15/22H04N13/243H04N13/246H04N13/25H04N13/254H04N13/296H04N23/54H04N23/71H04N23/74H04R1/406H04R3/005A61B6/4441A61B2034/2048A61B2034/2057A61B2034/2063A61B34/30A61B2090/365A61B2090/367A61B2090/371G06T2207/10021G06T2207/10024G06T2207/10048G06T2207/30004G10L2015/223H04N2213/001
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Quick Facts
Patent No.
US 12,239,388
App. No.
17/699,825
Granted
Mar 4, 2025
Kind
B2
Abstract

A camera tracking bar of a camera tracking system for computer assisted surgery navigation. The camera tracking bar includes a first set of stereo tracking cameras having first resolution, first field of view, and spaced apart on the camera tracking bar by a first baseline distance. The camera tracking bar also includes a second set of stereo tracking cameras having second resolution, second field of view, and spaced apart on the camera tracking bar by a second baseline distance that is less than the first baseline distance. The second set of stereo tracking cameras is positioned between the first set of stereo tracking cameras, and the resolution and/or the field of view of the second set of stereo tracking cameras is different from the resolution and/or the field of view of the first set of stereo tracking cameras. A communication interface provides camera video streams to the camera tracking subsystem.

Claims (44)

1. A camera tracking bar of a camera tracking system for computer assisted navigation during surgery, the camera tracking bar comprising:

a first set of stereo tracking cameras having a first resolution, a first field of view, and spaced apart on the camera tracking bar by a first baseline distance;

a second set of stereo tracking cameras having a second resolution, a second field of view, and spaced apart on the camera tracking bar by a second baseline distance;

a communication interface configured to provide video streams from the first set of stereo tracking cameras and the second set of stereo tracking cameras to the camera tracking system;

a processor configured to align orientation of the video streams and motion data measurements to a gravity reference; and

a microphone array including a plurality of microphones spaced apart along the camera tracking bar and connected to provide at least one audio stream to a computer platform,

wherein the first resolution and the first field of view of the first set of stereo tracking cameras are configured to output frames in the video stream imaging a reference array posed during surgery extends across a pixel array of at least 10 pixels by 10 pixels and not more than 30 pixels by 30 pixels.

2. The camera tracking bar of claim 1 , wherein:

each of the first set of stereo tracking cameras are attached to a surface of the camera tracking bar and angled inward toward each other at a first angle; and

each of the second set of stereo tracking cameras are attached to a surface of the camera tracking bar and angled inward toward each other at a second angle that is different from the first angle.

3. The camera tracking bar of claim 1 , further comprising a high rate inertial measurement unit comprising a 3-axis gyroscope and a 3-axis accelerometer, wherein the inertial measurement unit is configured to output motion data indicating measured motion of the camera tracking bar and the communication interface is further configured to provide the motion data to the camera tracking system.

4. The camera tracking bar of claim 3 , wherein the inertial measurement unit is configured to include in the motion data measurements of an angular velocity of the 3-axis gyroscope and measurements of a linear acceleration of the 3-axis accelerometer.

5. The camera tracking bar of claim 1 , wherein the second baseline distance is less than the first baseline distance.

6. The camera tracking bar of claim 1 , wherein the computer platform is configured to perform at least one of:

record the at least one audio stream;

identify voice commands contained in the at least one audio stream and selectively trigger defined operations that are associated with identified ones of the voice commands;

measure ambient noise levels contained in the at least one audio stream; and

triangulate location of a source of a sound contained in at least two audio streams provided by the plurality of microphones.

7. The camera tracking bar of claim 1 , wherein the second resolution and the second field of view of the second set of stereo tracking cameras are configured to output frames in the video stream imaging the reference array extends across a pixel array of at least 10 pixels by 10 pixels and not more than 30 pixels by 30 pixels.

8. The camera tracking bar of claim 7 , wherein:

the first resolution is 7 megapixels, the first field of view is 50 degrees, the first baseline distance is 0.5 meters; and

the second resolution is 1.5 megapixels, the second field of view is 85 degrees, and the second baseline distance is 0.4 meters.

9. The camera tracking bar of claim 1 , wherein:

the first set of stereo tracking cameras are configured to provide a first tracking volume with a first nearfield three dimensional volume pyramid of 413 millimeters wide by 427 millimeters high and with a first farfield three dimensional volume pyramid of 1619 millimeters wide and 1463 millimeters high; and

the second set of stereo tracking cameras are configured to provide a second tracking volume with a second nearfield three dimensional volume pyramid of 585 millimeters wide by 1020 millimeters high and with a second farfield three dimensional volume pyramid of 2227 millimeters wide and 4589 millimeters high.

10. The camera tracking bar of claim 1 , further comprising a set of near-infrared illuminators positioned around each of the first set of stereo tracking cameras, and at least one processor operationally configured to turn on the illuminators when an ambient light level detected by at least one of the first set of stereo tracking cameras is below an ambient light threshold, and responsive to turning on the near-infrared illuminators cease processing video from the first set of stereo tracking cameras using values from a visible light camera calibration file and start processing video from the first set of stereo tracking cameras using values from an near-infrared light camera calibration file.

11. The camera tracking bar of claim 10 , wherein:

the first set of stereo tracking cameras comprises a dual-pass filter configured to pass a narrow-wavelength band in visible light and another narrow-wavelength band in near-infrared light; and

the camera tracking system is configured to track pose of retro-reflective fiducials of a reference array in the video streams capturing narrow-wavelength band in visible light and the other narrow-wavelength band in near-infrared light.

12. The camera tracking bar of claim 1 , further comprising a set of illuminators emitting predominately one color positioned around each of the first set of stereo tracking cameras, and at least one processor operationally configured to turn on the illuminators when an ambient light level detected by at least one of the first set of stereo tracking cameras is below an ambient light threshold, and responsive to turning on the near-infrared illuminators cease processing video from the first set of stereo tracking cameras using values from an ambient light camera calibration file and start processing video from the first set of stereo tracking cameras using values from a colored light camera calibration file.

13. The camera tracking bar of claim 1 , wherein the first set of stereo tracking cameras is configured to have a different sensor exposure speed than the second set of stereo tracking cameras.

14. The camera tracking bar of claim 1 , wherein video frames output by the first set of stereo tracking cameras and the second set of stereo tracking cameras are synchronized by a common synchronization signal output by a floating point gate array.

15. A camera tracking system for computer assisted navigation during surgery, the camera tracking system comprising:

a camera tracking bar including:

a first set of stereo tracking cameras having a first resolution, a first field of view, and spaced apart on the camera tracking bar by a first baseline distance,

a second set of stereo tracking cameras having a second resolution, a second field of view, and spaced apart on the camera tracking; and

a camera tracking subsystem configured to determine pose of fiducials of a reference array in video streams from the first set of stereo tracking cameras and the second set of stereo tracking cameras,

wherein the first resolution and the first field of view of the first set of stereo tracking cameras are configured to output frames in the video stream imaging a reference array posed during surgery extends across a pixel array of at least 10 pixels by 10 pixels and not more than 30 pixels by 30 pixels.

16. The camera tracking system of claim 15 , wherein:

the second resolution and the second field of view of the second set of stereo tracking cameras are configured to output frames in the video stream imaging the reference array extends across a pixel array of at least 10 pixels by 10 pixels and not more than 30 pixels by 30 pixels.

17. The camera tracking system of claim 15 , wherein the camera tracking bar is further comprising a set of near-infrared illuminators positioned around each of the first set of stereo tracking cameras, and at least one processor operationally configured to turn on 2900 the illuminators when an ambient light level detected by at least one of the first set of stereo tracking cameras is below an ambient light threshold, and responsive to turning on the near-infrared illuminators cease processing video from the first set of stereo tracking cameras using values from a visible light camera calibration file and start processing video from the first set of stereo tracking cameras using values from an near-infrared light camera calibration file.

18. The camera tracking system of claim 17 , wherein the first set of stereo tracking cameras comprises a dual-pass filters configured to pass a narrow-wavelength band in visible light and another narrow-wavelength band in near-infrared light; and

the camera tracking subsystem is configured to track pose of retro-reflective fiducials of a reference array in the video streams capturing narrow-wavelength band in visible light and the other narrow-wavelength band in near-infrared light.

19. The camera tracking system of claim 15 , wherein the camera tracking bar is further comprising a set of illuminators emitting predominately one color positioned around each of the first set of stereo tracking cameras, and at least one processor operationally configured to turn on the illuminators when an ambient light level detected by at least one of the first set of stereo tracking cameras is below an ambient light threshold, and responsive to turning on the near-infrared illuminators cease processing video from the first set of stereo tracking cameras using values from an ambient light camera calibration file and start processing video from the first set of stereo tracking cameras using values from a colored light camera calibration file.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 21, 2022
From: CALLOWAY, THOMAS; NAIMARK, LEONID
To: GLOBUS MEDICAL, INC.
Reel/Frame 059326/0846 →
Continuity (2)
Continuation 16896424 · Jun 9, 2020
Related Publication 20220211447A1 · Jul 7, 2022
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