Source: https://patents.google.com/patent/US20160220320A1/en
Timestamp: 2019-12-13 00:04:28
Document Index: 49288388

Matched Legal Cases: ['application No. 61', 'application No. 61', 'application No. 60', 'application No. 60', '§120', '§120']

US20160220320A1 - Surgical tool systems and methods - Google Patents
US20160220320A1
US20160220320A1 US15/095,883 US201615095883A US2016220320A1 US 20160220320 A1 US20160220320 A1 US 20160220320A1 US 201615095883 A US201615095883 A US 201615095883A US 2016220320 A1 US2016220320 A1 US 2016220320A1
US15/095,883
Nicholas A. Theodore
Nobert Johnson
2007-08-13 Priority to US11/838,027 priority patent/US8219177B2/en
2007-08-27 Priority to US11/845,557 priority patent/US8219178B2/en
2012-06-21 Priority to US201261662702P priority
2012-07-05 Priority to US13/542,560 priority patent/US9078685B2/en
2013-10-24 Priority to US14/062,707 priority patent/US10357184B2/en
2015-06-03 Priority to US14/729,096 priority patent/US10172678B2/en
2016-04-11 Application filed by Globus Medical Inc filed Critical Globus Medical Inc
2016-04-11 Priority to US15/095,883 priority patent/US20160220320A1/en
2016-04-22 Priority claimed from US15/135,658 external-priority patent/US10231791B2/en
2016-05-12 Assigned to GLOBUS MEDICAL, INC. reassignment GLOBUS MEDICAL, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MOULTON, TIMOTHY, CLEARY, DAVID, FORSYTH, JEFFREY, THEODORE, NICHOLAS A., LEBOEUF, ROBERT, CRAWFORD, NEIL R., FOSTER, Mitchell, JOHNSON, NORBERT, MAJOR, CHRIS, ZHANG, KEVIN
2016-05-18 Priority claimed from US15/157,444 external-priority patent/US20160256225A1/en
2016-06-13 Priority claimed from US15/180,135 external-priority patent/US10136954B2/en
2016-08-04 Publication of US20160220320A1 publication Critical patent/US20160220320A1/en
2016-09-16 Priority claimed from US15/267,950 external-priority patent/US20170007334A1/en
2016-10-10 Priority claimed from US15/289,537 external-priority patent/US20170020630A1/en
2016-11-04 Priority claimed from US15/343,255 external-priority patent/US20170071691A1/en
2016-11-10 Priority claimed from US15/347,841 external-priority patent/US20170119339A1/en
2016-12-07 Priority claimed from US15/371,304 external-priority patent/US20170079727A1/en
2017-03-03 Priority claimed from US15/448,670 external-priority patent/US20170172669A1/en
2017-03-27 Priority claimed from US15/469,942 external-priority patent/US20170252114A1/en
2017-04-10 Priority claimed from EP17165798.4A external-priority patent/EP3241518A3/en
2017-05-31 Priority claimed from US15/609,334 external-priority patent/US20170258535A1/en
2017-05-31 Priority claimed from US15/609,680 external-priority patent/US20170265774A1/en
2017-07-18 Priority claimed from US15/652,914 external-priority patent/US20170312039A1/en
2017-10-30 Priority claimed from US15/796,886 external-priority patent/US20180064497A1/en
2017-11-10 Priority claimed from US15/809,034 external-priority patent/US20180132839A1/en
2018-01-29 Priority claimed from US15/881,971 external-priority patent/US20180147018A1/en
2018-03-28 Priority claimed from US15/938,356 external-priority patent/US20180214221A1/en
2018-04-09 Priority claimed from US15/948,013 external-priority patent/US20180221098A1/en
2018-05-10 Priority claimed from US15/975,846 external-priority patent/US20180256259A1/en
2018-06-07 Priority claimed from US16/002,047 external-priority patent/US20180296283A1/en
2018-06-07 Priority claimed from US16/002,223 external-priority patent/US20180279993A1/en
2018-06-27 Priority claimed from US16/020,302 external-priority patent/US20190000561A1/en
2018-06-28 Priority claimed from US16/021,068 external-priority patent/US20190000569A1/en
2018-06-29 Priority claimed from US16/023,633 external-priority patent/US20190000571A1/en
2018-07-16 Priority claimed from US16/035,779 external-priority patent/US20180325610A1/en
2018-10-03 Priority claimed from US16/150,477 external-priority patent/US20190029765A1/en
2018-10-10 Priority claimed from US16/156,350 external-priority patent/US20190038366A1/en
2018-12-14 Priority claimed from US16/220,246 external-priority patent/US20190117313A1/en
2018-12-20 Priority claimed from US16/226,770 external-priority patent/US20190269467A1/en
210000003484 anatomy Anatomy 0 abstract claims description 39
Embodiments of the present disclosure provide a surgical robot system may include an end-effector element configured for controlled movement and positioning and tracking of surgical instruments and objects relative to an image of a patient's anatomical structure. In some embodiments the end-effector may be tracked by surgical robot system and displayed to a user. In some embodiments the end-effector element may be configured to restrict the movement of an instrument assembly in a guide tube. In some embodiments, the end-effector may contain structures to allow for magnetic coupling to a robot arm and/or wireless powering of the end-effector element. In some embodiments, tracking of a target anatomical structure and objects, both in a navigation space and an image space, may be provided by a dynamic reference base located at a position away from the target anatomical structure.
This application is a continuation in part application of U.S. patent application Ser. No. 14/062,707 filed on Oct. 24, 2013 (published as U.S. Patent Publication No. 2014/0275955), which is a continuation in part application of U.S. patent application Ser. No. 13/924,505 filed on Jun. 21, 2013, which is a non-provisional patent application that claims priority to provisional application No. 61/662,702 filed on Jun. 21, 2012 and claims priority to provisional application No. 61/800,527 filed on Mar. 15, 2013, all of which are incorporated by reference in their entirety herein. In addition, this application is a continuation in part application of U.S. patent application Ser. No. 14/729,096 filed on Jun. 3, 2015 (published as U.S. Patent Publication No. 2015/0335386), which is a continuation application of U.S. patent application Ser. No. 13/542,560 filed on Jul. 5, 2012 (issued as U.S. Pat. No. 9,078,685), which is a continuation application of U.S. patent application Ser. No. 11/845,557 filed on Aug. 27, 2007 (issued as U.S. Pat. No. 8,219,178), which is a continuation in part application of U.S. patent application Ser. No. 11/838,027 filed on Aug. 13, 2007 (issued as U.S. Pat. No. 8,219,177), which is a continuation in part application of U.S. patent application Ser. No. 11/676,023 filed on Feb. 16, 2007 (issued as U.S. Pat. No. 8,010,181), which is a non-provisional patent application that claims priority to provisional application No. 60/775,816 filed on Feb. 16, 2006 and claims priority to provisional application No. 60/774,586 filed on Feb. 16, 2006, all of which are incorporated by reference in their entirety herein.
The present disclosure generally relates to the use of robots in medical procedures and more particularly, the use of robots in surgical procedures that, for example, graphically depict anatomical structures of a patient on a display device and the location of surgical instruments in relation to those anatomical structures.
Various medical procedures require the accurate localization of a three-dimensional position of a surgical instrument within the body in order to effect optimized treatment. For example, some surgical procedures to fuse vertebrae require that a surgeon drill multiple holes into the bone structure at specific locations. To achieve high levels of mechanical integrity in the fusing system, and to balance the forces created in the bone structure, it is necessary that the holes are drilled at the correct location. Vertebrae, like most bone structures, have complex shapes including non-planar curved surfaces making accurate and perpendicular drilling difficult.
Conventionally, using currently-available systems and methods, a surgeon manually holds and positions a drill guide tube by using a guidance system to overlay the drill tube's position onto a three dimensional image of the anatomical structures of a patient, for example, bone structures of the patient. This manual process is both tedious, time consuming, and error-prone. Further, whether the surgery can be considered successful largely depends upon the dexterity of the surgeon who performs it. Thus, there is a need for the use of robot assisted surgery to more accurately position surgical instruments and more accurately depict the position of those instruments in relation to the anatomical structures of the patient.
Currently, limited robotic assistance for surgical procedures is available. For example, certain systems allow a user to control a robotic actuator. These systems convert a surgeon's gross movements into micro-movements of the robotic actuator to more accurately position and steady the surgical instruments when undergoing surgery. Although these systems may aid in eliminating hand tremor and provide the surgeon with improved ability to work through a small opening, like many of the robots commercially available today, these systems are expensive, obtrusive, and require a cumbersome setup for the robot in relation to the patient and the user (e.g., a surgeon). Further, for certain procedures, such as thoracolumbar pedicle screw insertion, these conventional methods are known to be error-prone and tedious.
The current systems have many drawbacks including but not limited to the fact that autonomous movement and precise placement of a surgical instrument can be hindered by a lack of mechanical feedback and/or a loss of visual placement once the instrument is submerged within a portion of a patient. These drawbacks make the existing surgical applications error prone resulting in safety hazards to the patient as well as the surgeon during surgical procedures.
In addition, current robot assisted systems suffer from other disadvantages. The path and angle in which a surgical instrument is inserted into a patient (a trajectory of the instrument) may be limited due to the configuration of the robot arm and the manner in which it can move. For example, some current systems may not have enough range of motion or movement to place the surgical instrument at a trajectory ideal for placement into the patient and/or at a position that allows the surgeon an optimal view for performing the surgery.
The present disclosure overcomes the disadvantages of current robot assisted surgical applications. For example, the present disclosure allows for precisely locating anatomical structures in open, percutaneous, or minimally invasive surgery (MIS) procedures and positioning surgical instruments or implants during surgery. In addition, the present disclosure may improve stereotactic surgical procedures by allowing for identification and reference to a rigid anatomical structure relative to a pre-op computerized tomography (CT) scan, intra-op CT scan or fluoroscopy/x-ray based image of the anatomy. Further, the present disclosure may integrate a surgical robotic arm, a local positioning system, a dynamic reference base, and planning software to assist a surgeon in performing medical procedures in a more accurate and safe manner thereby reducing the error prone characteristics of current robot assisted systems and methods.
Exemplary embodiments of the present disclosure may provide a surgical robot system comprising a robot base having a display, a robot arm coupled to the robot base, wherein movement of the robot arm is electronically controlled by the robot base, and an end-effector, coupled to the robot arm, containing one or more end-effector tracking markers. The robot base may be in electronic communication with the one or more end-effector tracking markers and the display is configured to indicate a location of the end-effector in relation to at least one of the robot base and the robot arm.
Exemplary embodiments of the present disclosure may also provide a surgical robot system comprising a robot base having a display, a robot arm coupled to the robot base, wherein movement of the robot arm is electronically controlled by the robot base, and an end-effector, coupled to the robot arm, containing an instrument detecting sensor. The guide tube, disposed in the end-effector, may be configured to receive an instrument assembly housing an instrument, and the instrument detecting sensor may be configured to determine the presence of the instrument when the instrument assembly enters the guide tube.
Exemplary embodiments of the present disclosure may provide a surgical robot system comprising a surgical robot base, a surgical robot arm electronically coupled to the surgical robot base, and an end-effector, coupled to the surgical robot arm, having a guide tube configured to receive an instrument assembly, the instrument assembly containing one or more grooves disposed along a length of the instrument assembly. The guide tube may be configured to engage at least one of the grooves to restrict rotational movement of the instrument assembly within the guide tube.
Exemplary embodiments of the present disclosure may provide a surgical robot system comprising a robot base, a robot arm electronically coupled to the robot base, wherein the robot arm contains at least one depression and a magnet disposed proximate to each of the at least one depression, a clamp containing one or more balls, each of the one or more balls configured to magnetically engage one of the at least one depression, and an end-effector, electronically coupled to the robot base, configured to be coupled to the clamp.
Exemplary embodiments of the present disclosure may provide a surgical robot system comprising a robot base, a robot arm electronically coupled to the robot base, and an end-effector electronically coupled to the robot base. The robot arm may contain a primary coil and the end-effector may contain a secondary coil wherein power is transmitted from the primary coil to the secondary coil to wirelessly power the end-effector.
Exemplary embodiments of the present disclosure may provide a surgical robot system comprising a dynamic reference base (DRB) attached to patient fixture instrument, wherein the dynamic reference base has one or more DRB markers indicating a position of the patient fixture instrument in a navigational space, and a registration fixture, having one or more registration markers, indicating a location of a target anatomical structure in the navigational space and one or more registration fiducials indicating a location of the target anatomical structure in an image space. The surgical robot system may be configured to associate the location of the target anatomical structure with the patient fixture instrument in the navigational space and the image space taking into account a relationship between the one or more registration markers and the one or more fiducials and the relationship between the registration makers and the DRB markers. The patient fixture instrument is located in a position different from the target anatomical structure.
FIGS. 1A-1B illustrate a surgical robot in accordance with an exemplary embodiment.
FIG. 1C illustrates a portion of a surgical robot with control of the translation and orientation of the end-effector in accordance with an exemplary embodiment.
FIG. 1D illustrates a partial view of a surgical robot having a plurality of optical markers mounted for calibration and tracking movement in accordance with an exemplary embodiment.
FIG. 2 illustrates a surgical robot operating on a patient in accordance with an exemplary embodiment.
FIG. 3 illustrates a surgical robot in accordance with an exemplary embodiment.
FIG. 4 illustrates a portion of a surgical robot in accordance with an exemplary embodiment.
FIG. 5 illustrates a block diagram of a surgical robot in accordance with an exemplary embodiment.
FIG. 6 illustrates a surgical robot in accordance with an exemplary embodiment.
FIGS. 7A-C illustrate an end-effector in accordance with an exemplary embodiment.
FIGS. 8A-C illustrate an instrument and an instrument assembly in accordance with an exemplary embodiment.
FIGS. 9A-B illustrate an end-effector in accordance with an exemplary embodiment.
FIG. 10A-B illustrate an end-effector and instrument assembly in accordance with an exemplary embodiment.
FIG. 11 illustrates an instrument and guide tube in accordance with an exemplary embodiment.
FIGS. 12A-C illustrate portions of an end-effector and robot arm in accordance with an exemplary embodiment.
FIG. 13 illustrates portions of an end-effector and robot arm in accordance with an exemplary embodiment.
FIG. 14 illustrates a dynamic reference array, an imaging array, and other components in accordance with an exemplary embodiment.
FIG. 15 illustrates a method of registration in accordance with an exemplary embodiment.
It is to be understood that the present disclosure is not limited in its application to the details of construction and the arrangement of components set forth in the description herein or illustrated in the drawings. The teachings of the present disclosure may be used and practiced in other embodiments and practiced or carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of “including,” “comprising,” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless specified or limited otherwise, the terms “mounted,” “connected,” “supported,” and “coupled” and variations thereof are used broadly and encompass both direct and indirect mountings, connections, supports, and couplings. Further, “connected” and “coupled” are not restricted to physical or mechanical connections or couplings.
FIGS. 1A, 1B, and 1D illustrate a surgical robot system 100 in accordance with an exemplary embodiment. Surgical robot system 100 may include a surgical robot 102, a robot arm 104, a base 106, a housing 108, a display 110, an end-effector or end-effectuator 112, a guide tube 114, a tracking array 116, and tracking markers 118.
FIG. 1C illustrates a portion of a surgical robot system 100 with control of the translation and orientation of end-effector 112 in accordance with an exemplary embodiment.
As shown in FIGS. 1A and 1B, surgical robot 102 can comprise a display 110 and a housing 108. Display 110 can be attached to the surgical robot 102 and in other exemplary embodiments, display 110 can be detached from surgical robot 102, either within a surgical room with the surgical robot 102, or in a remote location. In some embodiments, housing 108 can comprise robot arm 104 and an end-effector 112. End-effector 112 may be coupled to the robot arm 104 and controlled by at least one motor. In exemplary embodiments, end-effector 112 can comprise a surgical instrument used to perform surgery on a patient 210. In exemplary embodiments, end-effector 112 can be coupled to the surgical instrument. As used herein, the term “end-effector” is used interchangeably with the term “effectuator element.” In some embodiments, end-effector 112 can comprise any known structure for effecting the movement of the surgical instrument in a desired manner.
FIG. 1C illustrates a portion of a surgical robot 102 with control of the translation and orientation of end-effector 112 in accordance with an exemplary embodiment. As shown, some embodiments include a surgical robot system 100 capable of using robot 102 with an ability to move end-effector 112 along x-, y-, and z-axes (see 126, 128, 130 in FIG. 1C). In this embodiment, x-axis 126 can be orthogonal to y-axis 128 and z-axis 130, y-axis 128 can be orthogonal to x-axis 126 and z-axis 130, and z-axis 130 can be orthogonal to x-axis 126 and y-axis 128. In an exemplary embodiment, robot 102 can be configured to effect movement of end-effector 112 along one axis independently of the other axes. For example, in some exemplary embodiments, robot 102 can cause the end-effector 112 to move a given distance of 500 mm or more along x-axis 126 without causing any substantial movement of end-effector 112 along y-axis 128 or z-axis 130. As used in this context “substantial” may mean a deviation of more than two degrees or 2 mm from an intended path or some other predetermined deviation that may be appropriate for the surgical application.
In some further exemplary embodiments, end-effector 112 can be configured for selective rotation about one or more of x-axis 126, y-axis 128, and a Z Frame axis 130 (such that one or more of the Euler Angles (e.g., roll, pitch, and/or yaw) associated with end-effector 112 can be selectively controlled). For example, roll 122 is selective rotation about y-axis 128 without substantial deviation about or along x-axis 126 or Z Frame axis 130; pitch 120 is selective rotation about x-axis 126 without substantial deviation about or along y-axis 128 or Z Frame axis 130. In some exemplary embodiments, during operation, end-effector 112 and/or the surgical instrument may be aligned with a selected orientation axis (labeled “Z Tube” 64 in FIG. 1C) that can be selectively varied and monitored by robot system 100. End-effector 112 may contain a linear actuator that causes guide tube 114 to move in Z Tube axis 64 direction.
In some exemplary embodiments, selective control of the translation and orientation of end-effector 112 can permit performance of medical procedures with significantly improved accuracy compared to conventional robots that utilize, for example, a six degree of freedom robot arm comprising only rotational axes. For example, in some exemplary embodiments, as shown in FIG. 2, surgical robot system 100 may be used to operate on patient 210, and robot arm 104 that can be positioned above the body of patient 210, with end-effector 112 selectively angled relative to the z-axis toward the body of patient 210.
In some exemplary embodiments, the position of the surgical instrument can be dynamically updated so that surgical robot 102 can be aware of the location of the surgical instrument at all times during the procedure. Consequently, in some exemplary embodiments, surgical robot 102 can move the surgical instrument to the desired position quickly, with minimal damage to patient 210, and without any further assistance from a physician (unless the physician so desires). In some further embodiments, surgical robot 102 can be configured to correct the path of the surgical instrument if the surgical instrument strays from the selected, preplanned trajectory. In some exemplary embodiments, surgical robot 102 can be configured to permit stoppage, modification, and/or manual control of the movement of end-effector 112 and/or the surgical instrument. Thus, in use, in exemplary embodiments, a physician or other user can operate the system 100, and has the option to stop, modify, or manually control the autonomous movement of end-effector 112 and/or the surgical instrument. Further details of surgical robot system 100 including the control and movement of a surgical instrument by surgical robot 102 can be found in co-pending U.S. patent application Ser. No. 13/924,505 from which this application claims priority under 35 U.S.C. §120, and which is incorporated herein by reference in its entirety.
As shown in FIGS. 1B and 1D, in exemplary embodiments, robotic surgical system 100 can comprise a plurality of tracking markers 118 configured to track the movement of robot arm 104, end-effector 112, and/or the surgical instrument in three dimensions. It should be appreciated that three dimensional positional information from tracking markers 118 can be used in conjunction with the one dimensional linear or rotational positional information from absolute or relative conventional linear or rotational encoders on each axis of robot 102 to maintain a high degree of accuracy. In exemplary embodiments, the plurality of tracking markers 118 can be mounted (or otherwise secured) thereon an outer surface of the robot 102, such as, for example and without limitation, on base 106 of robot 102, or robot arm 104 (see for example FIG. 1B). Further, in exemplary embodiments, the plurality of tracking markers 118 can be positioned on base 106 of robot 102 spaced from surgical field 208 to reduce the likelihood of being obscured by the surgeon, surgical tools, or other parts of robot 102. In exemplary embodiments, at least one tracking marker 118 of the plurality of tracking markers 118 can be mounted or otherwise secured to end-effector 112 (see for example FIG. 1D).
In exemplary embodiments, system 100 can use tracking information collected relative to the robot base 106 to calculate the orientation and coordinates of the surgical instrument held in the tube 114 based on encoder counts along x-axis 126, y-axis 128, z-axis 130, Z-tube axis 124, and the roll 122 and pitch 120 axes.
In exemplary embodiments, one or more of markers 118 may be optical markers and at least one optical marker may be positioned on the robot 102 between the base 106 of the robot 102 and end-effector 112 instead of, or in addition to, other markers 118 on base 106. In some embodiments, the positioning of one or more tracking markers 118 on end-effector 112 can maximize the accuracy of the positional measurements by serving to check or verify the position of end-effector 112 (calculated from the positional information of markers 118 on base 106 and encoder counts of z-axis 130, x-axis 126, y-axis 128, roll axis 122, pitch axis 120, and Z-tube axis 124).
In exemplary embodiments, the at least one tracking marker 118 can be mounted to a portion of the robot 102 that effects movement of end-effector 112 and/or the surgical instrument along the x-axis to enable the at least one tracking marker 118 to move along x-axis 126 as end-effector 112 and the surgical instrument move along the x-axis 126 (see FIG. 1D). In exemplary embodiments, placement of tracking markers 118 as described can reduce the likelihood of a surgeon blocking one or more tracking markers 118 from the cameras or detection device, or one or more tracking markers 118 becoming an obstruction to surgery.
In exemplary embodiments, because of the high accuracy in calculating the orientation and position of end-effector 112 based on an output of one or more of tracking markers 118 and/or encoder counts from each axis, it can be possible to very accurately determine the position of end-effector 112. For example, in exemplary embodiments, without requiring knowledge of the counts of axis encoders for the z-axis 130 (which is between the x-axis 126 and the base 106), knowing only the position of markers 118 on the x-axis 126 and the counts of encoders on the y-axis 128, roll axis 62, pitch axis 120, and Z-tube axis 124 can enable computation of the position of end-effector 112. In some embodiments, the placement of markers 118 on any intermediate axis of robot 102 can permit the exact position of end-effector 112 to be calculated based on location of such markers 118 and counts of encoders on axes (126, 120, 122, and 124) between markers 118 and end-effector 112. Further details of surgical robot system 100 including the control, movement and tracking of surgical robot 102 and of a surgical instrument can be found in co-pending U.S. patent application Ser. No. 13/924,505 from which this application claims priority under 35 U.S.C. §120, and which is incorporated herein by reference in its entirety as earlier recited.
Exemplary embodiments include one or more markers coupled to the surgical instrument as described in greater detail below. In exemplary embodiments, these markers as well as markers 118 can comprise conventional infrared light-emitting diodes or an Optotrak® diode capable of being tracked using a commercially available infrared optical tracking system such as Optotrak®. Optotrak® is a registered trademark of Northern Digital Inc., Waterloo, Ontario, Canada. In other embodiments, markers 118 can comprise conventional reflective spheres capable of being tracked using a commercially available optical tracking system such as Polaris Spectra. Polaris Spectra is also a registered trademark of Northern Digital, Inc.
Referring to FIG. 2, surgical robot system 100 is shown and further includes cameras 200, a camera arm 202, camera arm joints 204 and 206. FIG. 2 further depicts surgical field 208 and patient 210.
In exemplary embodiments, light emitted from and/or reflected by markers 118 and markers on the surgical instrument can be read by camera 200 and can be used to monitor the location and movement of robot 102 (see for example camera 200 mounted on the camera arm 202 and capable of movement through camera arm joint 204 and camera arm joint 206 shown in FIG. 2). In exemplary embodiments, markers 118 and the markers on the surgical instrument can comprise a radio-frequency and/or electromagnetic reflector or transceiver and the camera 200 can include or be replaced by a radio-frequency and/or electromagnetic transceiver.
FIG. 3 illustrates a surgical robot system 300 and camera stand 302 consistent with an exemplary embodiment of the present disclosure. Surgical robot system 300 may comprise display 304, upper arm 306, lower arm 308, end-effector 310, vertical column 312, casters 314, cabinet 316, tablet drawer 318, connector panel 320, control panel 322, and ring 324. Camera stand 302 may comprise camera 326. These components are described in greater with respect to FIG. 5.
Input power is suppled to system 300 via a power source 548 which may be provided to power distribution module 404. Power distribution module 404 receives input power and is configured to generate different power supply voltages that are provided to other modules, components, and subsystems of system 300. Power distribution module 404 may be configured to provide different voltage supplies to platform interface module 406, which may be provided to other components such as computer 408, display 304, speaker 536, driver 508 to, for example, power motors 512, 514, 516, 518 and end-effector 310, motor 510, ring 324, camera converter 542, and other components for system 300 for example, fans for cooling the electrical components within cabinet 316.
Tracking subsystem 532 may include position sensor 504 and converter 542. Tracking subsystem 532 may correspond to camera stand 302 including camera 326 as described with respect to FIG. 3. Position sensor 504 may be camera 326. Tracking subsystem may track the location of certain markers that are located on the different components of system 300 and/or instruments used by a user during a surgical procedure. This tracking may be conducted in a manner consistent with the present disclosure including the use of infrared technology that tracks the location of active or passive elements, such as LEDs or reflective markers, respectively. The location, orientation, and position of structures having these types of markers may be provided to computer 408 which may be shown to a user on display 304. For example, a surgical instrument having these types of markers and tracked in this manner (which may be referred to as a navigational space) may be shown to a user in relation to a three dimensional image of a patient's anatomical structure.
FIG. 6 illustrates a surgical robot system 600 consistent with an exemplary embodiment. Surgical robot system 600 may comprise end-effector 602, robot arm 604, guide tube 606, instrument 608, and robot base 610. Instrument tool 608 may be attached to a tracking array 612 and have an associated trajectory 614. Trajectory 614 may represent a path of movement that instrument tool 608 is configured to travel once it is secured in guide tube 606, for example, a path of insertion of instrument tool 608 into a patient. In an exemplary operation, robot base 610 may be configured to be in electronic communication with robot arm 604 and end-effector 602 so that surgical robot system 600 may assist a user (for example, a surgeon) in operating on a patient. Surgical robot system 600 may be consistent with previously described surgical robot system 100 and 300.
A tracking array 612 may be mounted on instrument 608 to monitor the location and orientation of instrument tool 608. As described in greater detail below with respect to FIG. 8A, tracking array 612 may be attached to an instrument assembly 802 and may comprise markers 804. Instrument assembly 802 may house instrument 608 as described in further detail below with respect to FIG. 8B. Markers 804 may be, for example, light emitting diodes and/or other types of markers as described consistent with the present disclosure. The tracking devices may be one or more line of sight devices associated with the surgical robot system. As an example, the tracking devices may be cameras associated with the surgical robot system and may also track tracking array 612 for a defined domain or relative orientations of the instrument in relation to the robot arm, the robot base, and/or a patient. The tracking devices may be consistent with those structures described in connection with camera stand 302 and tracking subsystem 532.
FIGS. 7A, 7B, and 7C illustrate a top view, front view, and side view, respectively, of end-effector 602 consistent with an exemplary embodiment. End-effector 602 may additionally comprise one or more markers 702. Markers 702 may be light emitting diodes or other types of markers that have been previously described.
Markers 702 may be disposed on end-effector 602 in a manner such that the markers are visible by one or more tracking devices associated with the surgical robot system. The tracking devices may track end-effector 602 as it moves to different positions and viewing angles by following the movement of tracking markers 702. The location of markers 702 and/or end-effector 602 may be shown on a display associated with the surgical robot system, for example, display 110 as shown in FIG. 1 and/or display 304 shown in FIG. 3. This display may allow a user to ensure that end-effector 602 is in a desirable position in relation to robot arm 604, robot base 610, the patient, and/or the user.
For example, as shown in FIG. 7A, markers 702 may be placed around the surface of end-effector 602 so that a tracking device placed away from the surgical field and facing toward the robot and surgical field is able to view at least 3 of the markers 702 through a range of common orientations of the end effector relative to the tracking device. For example, distribution of markers in this way allows end-effector 602 to be monitored by the tracking devices when end-effector 602 is rotated by +/−135 degrees about the z-axis of the surgical robot system.
In addition, in exemplary embodiments, end-effector 602 may be equipped with infrared (IR) receivers that can detect when an external camera is getting ready to read markers 702. Upon this detection, end-effector 602 may then illuminate markers 702. The detection by the IR receivers that the external camera is ready to read markers 702 may signal the need to synchronize a duty cycle of markers 702, which may be light emitting diodes, to an external camera. This may also allow for lower power consumption by the robotic system as a whole, whereby markers 702 would only be illuminated at the appropriate time instead of being illuminated continuously. Further, in exemplary embodiments, markers 702 may be powered off to prevent interference with other navigation tools, such as different types of surgical instruments.
FIG. 8A depicts instrument 608 and instrument assembly 802. Instrument assembly 802 may further comprise tracking array 612, markers 804, an outer sleeve 806, one or more grooves 808, a tip 810, and an opening 812. Instrument 608 may include tip 814. Ultimately, as explained in greater detail with respect to FIGS. 10A and 10B, instrument assembly 802, which may house instrument 608, may be inserted into guide tube 606.
Markers 804 may be of any type described herein including but not limited to light emitting diodes or reflective spheres. Markers 804 are monitored by tracking devices associated with the surgical robot system and may be one or more line of sight cameras. The cameras may track the location of instrument assembly 802 based on the position and orientation of tracking array 612 and markers 804. A user, such as a surgeon, may orient instrument assembly 612 in a manner so that tracking array 612 and markers 804 are sufficiently recognized by the tracking devices to display instrument assembly 802 and markers 804 on, for example, display 110 of the exemplary surgical robot system. The manner in which a surgeon may place instrument assembly 802 into guide tube 606 and adjust instrument assembly 802 is explained in greater detail below.
Instrument assembly 802 may also include outer sleeve 806. Outer sleeve 806 may contain one or more grooves 808 and tip 810. As explained in greater detail below, tip 810 may contain lead-in features that assist in lining up one of grooves 808 with certain features of guide tube 606 to orient instrument assembly 802. The manner in which a user inserts instrument assembly 802 into guide tube 606 is explained in further detail with respect to FIGS. 10A and 10B.
FIG. 8A also depicts instrument 608. Instrument 608 may be a surgical tool or implement associated with the surgical robot system. Instrument 608 may be inserted into instrument assembly 802 by inserting tip 814 into opening 812. Once inside instrument assembly 802, instrument 608 is free to rotate about its shaft axis and move in an axial direction as determined by the user. FIG. 8B depicts instrument 608 inserted into instrument assembly 802. FIG. 8C depicts a bottom view of instrument 608 inserted into instrument assembly 802.
FIGS. 9A and 9B illustrate end-effector 602 consistent with an exemplary embodiment. End-effector 602 may comprise sensor 902 and sensor cover 904. The surgical robot system may contain circuitry that is configured to restrict or prevent robot arm 604 from moving when an instrument (for example, instrument 608) is in guide tube 606. Restricting or preventing movement of robot arm 604 while instrument 608 or another surgical instrument is in guide tube 606 may prevent a potentially hazardous situation to the patient and/or the user of the system while a sharp instrument is engaged in guide tube 606.
Sensor 902 may be configured such that it detects the presence of an instrument in guide tube 606. As shown in FIGS. 9A and 9B, sensor 902 may be embedded in an upper portion of guide tube 606. Sensor 902 may be a hall effect sensor using magnetic properties of the instrument to detect the instrument's presence in guide tube 606. Sensor 902 may be covered by sensor cover 904 as shown in FIGS. 9A and 9B.
Sensor 902 may detect the instrument's presence in guide tube 606. By way of example and in no way intended to limit the manner in which the sensor may be implemented, sensor 902 may be a capacitive or resistive sensor which uses changes in the electrical properties of guide tube 606, such as its impedance, when an instrument is present in guide tube 606. Further, sensor 902 may be a mechanical switch, such as an actuated or strain gauge. Further still, sensor 902 may be an optical sensor to determine the presence of an instrument in guide tube 606. In addition, sensor 902 may be an inductive sensor that uses magnetic field changes to determine the presence of an instrument in guide tube 606.
Sensor 902 may be configured to send a signal (sensor signal) to circuitry associated with the surgical robot system. Once the surgical robot system receives such a sensor signal, surgical robot system may restrict or prevent movement of robot arm 604 while an instrument is inside guide tube 606.
In a further embodiment, the surgical robot system may also disable tracking markers 702 in response to the sensor signal. This disabling response would prevent the undesirable situation of optical interference and partial occlusion from tracking markers 702, particularly if tracking markers are light emitting diodes.
FIGS. 10A and 10B illustrate a top view of end-effector 602 while instrument assembly 802 is inside guide tube 606 consistent with an exemplary embodiment. End-effector 602 may further comprise spring 1002 and ball detent 1004, both of which may be disposed in or near guide tube 606. FIGS. 10A and 10B also depict outer sleeve 806 and grooves 808.
Instrument 608 may be disposed within instrument assembly 802 as described with respect to FIG. 13. While instrument 608 is disposed in instrument assembly 802, instrument assembly 802 may be inserted in guide tube 606. Guide tube 606 may restrict the movement of instrument assembly 802 in a manner such that tracking array 612 remains in essentially the same orientation relative to robot arm 604 and robot base 612 so that tracking devices can display the location of instrument assembly 802 on, for example, display 110. Instrument 608 may be free to rotate about its shaft without affecting rotation of the array and may move in a direction consistent with trajectory 614.
Specifically, instrument assembly 802 (after instrument 608 is inserted therein), may be inserted into guide tube 606. Structures on tip 810 of outer sleeve 806 may cause one of grooves 808 to line up and engage with ball detent 1004. Ball detent 1004 may be in communication with spring 1002 such that when a force is applied to ball detent 1004, it is able to move backward against spring 1002 and when the force is removed spring 1002 moves ball detent 1004 in a forward direction. When ball detent 1004 engages a groove 808 it may move forward into that groove 808 and spring 1002 may apply sufficient force on ball detent 1004 so that ball detent is biased towards that groove 808. With ball detent 1004 lined up and engaged with one of grooves 808, instrument assembly 802 is inserted further into guide tube 606. FIG. 10B depicts a groove 808 engaged with ball detent 1004.
Instrument 608 may freely rotate about its shaft and move along the path of trajectory 614 within instrument assembly 802. Instrument assembly 802 may be restricted from rotating within guide tube 606 while a groove 808 is engaged with ball detent 1004. The rotational position of instrument assembly 802 within guide tube 606 may be chosen such that tracking array 612 is adequately visible to the tracking devices in order to properly display the position of instrument 608 on, for example, display 110 of the surgical robot system.
While rotational movement of instrument assembly 802 inside guide tube 606 may be restricted, the rotational position of instrument assembly 802 may be adjusted. For example, instrument assembly 802 may be adjusted so that tracking array 612 is in a better position to be visible by the tracking devices. In an exemplary embodiment, sufficient rotational force may be applied to instrument assembly 802 to disengage ball detent 1004 from a groove 808. Ball detent 1004 may move backwards upon disengaging with a groove 808. This disengagement is depicted in FIG. 10A. Once disengaged, the rotational position of instrument assembly 802 may be adjusted so that ball detent 1004 moves forward and engages a different groove 808.
Ball detent 1004 and the one or more grooves 808 may be configured such that movement along the path of trajectory 614 is not restricted. This configuration may allow instrument assembly 802 to move along a path of trajectory 614, while guide tube 606 restricts rotational movement of instrument assembly 802 to maintain a fixed orientation of tracking array 612 in relation to the tracking devices.
Ball detent 1004 has been described in relation to spring 1002 and being a spring plunger type of structure. However, it is understood that other structures may be used to restrict rotational movement of instrument assembly 802 in guide tube 606 in order to maintain an orientation of tracking array 612. For example, such structures may include and are not limited to a coil spring, wave spring, flexture, torsional spring mounted to a lever, or a compressible material. Further, ball detent 1004 and spring 1002 have been described as being part of guide tube 606, however, ball detent 1004 and spring 1002 may be disposed on instrument assembly 802 and engage with complimentary mechanisms associated with end-effector 602 or guide tube 606 to similarly restrict the rotation movement of instrument assembly 802.
FIG. 11 illustrates end-effector 602, instrument 608, instrument assembly 1102, tracking array 1104, and guide tube 606 consistent with an exemplary embodiment. Instrument assembly 1102 may further comprise groove 1106. Guide tube 606 may further comprise channel 1108.
As described previously, rotational movement of instrument assembly 802 may be restricted when it is received by guide tube 606. In an exemplary embodiment to restrict movement of an instrument assembly while inside a guide tube, instrument assembly 1102 may have groove 1106 configured to engage channel 1108 of guide tube 606 to similarly restrict rotational movement of instrument assembly 1102 when received by guide tube 606. Once groove 1106 is engaged with channel 1108, instrument assembly 1102 is restricted from rotating about its shaft axis while instrument assembly 1102 is inside guide tube 606.
Other methods and components may be used to restrict the rotational movement of an instrument assembly while inside a guide tube. For example, one or more cylindrical rollers may be used that is configured with roller axis perpendicular to the instrument shaft to roll and allow for axial movement of an instrument assembly along the path of trajectory 614 but is configured to remain stationary when attempts are made to rotationally move instrument assembly within guide tube 606. This configuration would have the effect of fixing the orientation of tracking array 612. The roller may be made of a flexible material and held rigidly protruding into guide tube 606 to engage with an outer sleeve of the instrument assembly. The roller may also be made of a rigid material and spring loaded, pushing into guide tube 606 to engage with the instrument assembly. Moreover, the roller may be disposed on an instrument assembly and engage guide tube 606 when the instrument assembly is inserted into guide tube 606.
As another exemplary embodiment, rotation of an outer sleeve of instrument assembly may be restricted from rotating but allowing for axial movement through the use of anisotropic surface textures for the outer sleeve and guide tube 606. This texture pattern may allow for different friction forces associated with rotation of the outer sleeve and axial movement so that a user may need to apply a relatively higher force to rotationally move the instrument assembly compared to moving the instrument assembly in an axial direction consistent with trajectory 614.
FIGS. 12A-C illustrate end-effector 602 and a portion of robot arm 604 consistent with an exemplary embodiment. End-effector 602 may further comprise body 1202 and clamp 1204. Clamp 1204 may comprise handle 1206, balls 1208, spring 1210, and lip 1212. Robot arm 604 may further comprise depressions 1214, mounting plate 1216, lip 1218, and magnets 1220.
With respect to the locating coupling, robot arm 1002 may comprise mounting plate 1716, which may be non-magnetic material, one or more depressions 1214, lip 1218, and magnets 1220. Magnet 1220 is mounted below each of depressions 1214. Portions of clamp 1204 may comprise magnetic material and be attracted by one or more magnets 1220. Through the magnetic attraction of clamp 1204 and robot arm 604, balls 1208 become seated into respective depressions 1214. For example, balls 1208 as shown in FIG. 12B would be seated in depressions 1214 as shown in FIG. 12A. This seating may be considered a magnetically-assisted kinematic coupling. Magnets 1220 may be configured to be strong enough to support the entire weight of end-effector 602 regardless of the orientation of end-effector 602. The locating coupling may be any style of kinematic mount that uniquely restrains six degrees of freedom.
FIG. 13 is a circuit diagram that illustrates power transfer between end-effector 602 and robot arm 604 consistent with an exemplary embodiment. End-effector 602 may comprise a coil 1302, resistor 1304, and diode 1306. Robot arm 604 may comprise coil 1308 and voltage supply 1310.
End-effector 602 and robot arm 604 may be configured in a manner to allow for wireless power transfer in order to power end-effector 602 and components associated with end-effector 602. In an exemplary embodiment, end-effector 602 may comprise coil 1302 that receives an electromagnetic field generated by robot arm 604. Robot arm 604 may contain coil 1308, which may serve as a primary coil in an inductive power transfer system between robot arm 604 and end-effector 602 over an air gap. In an exemplary embodiment, the air gap may be in the range of 0.1-20 mm. Coil 1308 may be coupled to voltage supply 1310 in order to generate the electromagnetic field. The electromagnetic field may be received by coil 1304 of end-effector 602 to generate an electrical current.
The inductive power relationship between may power components of end-effector 602 such as tracking markers 702, sensor 902, and other electrical components associated with end-effector 602. By providing wireless powering, end-effector 602 may be physically and/or electrically isolated from robot arm 604 while powering electronics and other components contained in end-effector 602.
The resistance of resistor 1304 may be varied among a number of distinct states, causing differential power draw. The power draw may be measured from the side of the surgical robot as a means of wirelessly passing a signal from end-effector 602 to the surgical robot base 610. Alternatively, a battery could be used to power the electronics, and a standard wireless communications protocol such as Bluetooth may be used to exchange signals between end-effectuator 602 and robot base 612. Data transferred to robot base 612 may include state information. This information may include a determination of whether end-effector 602 is detached from robot arm 604, and if instrument 608 is present in guide tube 606.
The power transmission between robot arm 604 and end-effector 602 may be based on electromagnetism, optics, or ultrasound. For each of these transmission types, the corresponding resistance on end-effector 602 can be varied to communicate the state of end-effector 602. End-effector 602 may propagate power or receive one or more signals by any of the aforementioned principles to other items in the sterile field, such as drills, screw drivers, implant holders, or lights. In addition, power and/or signal may be passed to other sterile items via a contact connection.
Referring to FIGS. 14 and 15, prior to or during a surgical procedure, certain registration procedures may be conducted in order to track objects and a target anatomical structure of the patient both in a navigation space and an image space. In order to conduct such registration, a registration system 400 may be used as illustrated in FIG. 14.
A patient fixation instrument 1402 may be secured to a rigid anatomical structure of the patient and a dynamic reference base (DRB) 1404 may be attached to patient fixation instrument 1402. For example, patient fixation instrument 1402 may be inserted into opening 1406 of dynamic reference base 1404. Dynamic reference base 1404 may contain markers 1408 that are visible to tracking devices, such as tracking subsystem 532. These markers may be optical markers or reflective spheres as previously discussed herein.
Patient fixation instrument 1402 is attached to a rigid anatomy of the patient and may remain attached throughout the surgical procedure. In an exemplary embodiment, patient fixation instrument 1402 is attached to a rigid area of the patient, for example a bone, that is located away from the targeted anatomical structure subject to the surgical procedure. In order to track the targeted anatomical structure, dynamic reference base 1404 is associated with the targeted anatomical structure through the use of a registration fixture that is temporarily placed on or near the targeted anatomical structure in order to register the dynamic reference base with the location of the targeted anatomical structure.
Using pivot arm 1412, registration fixture 1410 may be placed over the targeted anatomical structure and its location may be determined in an image space and navigation space using tracking markers or fiducials on registration fixture 1410. Registration fixture 1410 may contain a collection of markers 1420 that are visible in a navigational space (for example, markers 1420 may be detectable by tracking subsystem 532). Markers 1420 may be optical markers visible in infrared light as previously described herein. Registration fixture 1410 may also contain a collection of fiducials 1422, for example bearing balls, that are visible in an imaging space (for example, a three dimension CT image). As described in greater detail with respect to FIG. 15, using registration fixture 1410, the targeted anatomical structure may be associated with dynamic reference base 1404 thereby allowing depictions of objects in the navigational space to be overlaid on images of the anatomical structure. Dynamic reference base 1404, located at a position away from the targeted anatomical structure, may become a reference point thereby allowing removal of registration fixture 1410 and/or pivot arm 1412 from the surgical area.
FIG. 15 provides an exemplary method 1500 for registration consistent with the present disclosure. Method 1500 begins at step 1502 wherein a graphical representation (or image(s)) of the targeted anatomical structure may be imported into system 300, for example computer 408. The graphical representation may be three dimensional CT or a fluoroscope scan of the targeted anatomical structure of the patient which includes registration fixture 1410 and a detectable imaging pattern of fiducials 1420.
At step 1504, an imaging pattern of fiducials 1420 is detected and registered in the imaging space and stored in computer 408. Optionally, at this time at step 1506, a graphical representation of the registration fixture may be overlaid on the images of the targeted anatomical structure.
At step 1508, a navigational pattern of registration fixture 1410 is detected and registered by recognizing markers 1420. Markers 1420 may be optical markers that are recognized in the navigation space through infrared light by tracking subsystem 532 via position sensor 540. Thus, the location, orientation, and other information of the targeted anatomical structure is registered in the navigation space. Therefore, registration fixture 1410 may be recognized in both the image space through the use of fiducials 1422 and the navigation space through the use of markers 1420. At step 1510, the registration of registration fixture in the image space is transferred to the navigation space. This transferal is done, for example, by using the relative position of the imaging pattern of fiducials 1422 compared to the position of the navigation pattern of markers 1420.
At step 1512, registration of the navigation space of registration fixture (having been registered with the image space) is further transferred to the navigation space of dynamic registration array 1404 attached to patient fixture instrument 1402. Thus, registration fixture 1410 may be removed and dynamic reference base 1404 may be used to track the targeted anatomical structure in both the navigation and image space because the navigation space is associated with the image space.
At steps 1514 and 1516, the navigation space may be overlaid on the image space and objects with markers visible in the navigation space (for example, surgical instruments with optical markers). The objects may be tracked through graphical representations of the surgical instrument on the images of the targeted anatomical structure.
1. A surgical robot system comprising:
a robot base having a display;
a robot arm coupled to the robot base, wherein movement of the robot arm is electronically controlled by the robot base; and
an end-effector, coupled to the robot arm, containing one or more end-effector tracking markers;
wherein the robot base is electronic communication with the one or more end-effector tracking markers and the display is configured to indicate a location of the end-effector in relation to at least one of the robot base and the robot arm.
2. The surgical robot system of claim 1, wherein the one or more end-effector tracking markers is at least one of a light emitting diode, a reflective sphere configured to be tracked by an infrared optical tracking system, a radio frequency reflector, a radio frequency transceiver, an electromagnetic reflector, and an electromagnetic transceiver.
3. A surgical robot system comprising:
an end-effector, coupled to the robot arm, containing an instrument detecting sensor;
wherein a guide tube, disposed in the end-effector, is configured to receive an instrument assembly housing an instrument, and
wherein the instrument detecting sensor is configured to determine the presence of the instrument when the instrument assembly enters the guide tube.
4. The surgical robot system of claim 3, wherein a sensor signal indicating the presence of the instrument is transmitted to the robot base, and wherein movement of the robot arm is restricted by the robot based upon receiving the sensor signal indicating the presence of the instrument.
5. A surgical robot system comprising:
a surgical robot base;
a surgical robot arm electronically coupled to the surgical robot base; and
an end-effector, coupled to the surgical robot arm, having a guide tube configured to receive an instrument assembly, the instrument assembly containing one or more grooves disposed along a length of the instrument assembly,
wherein the guide tube is configured to engage at least one of the grooves to restrict rotational movement of the instrument assembly within the guide tube.
6. The surgical robot system of claim 5, wherein the instrument assembly is configured for the one or more grooves to disengage the guide tube upon the application of a sufficient force to allow rotational movement of the surgical instrument tool assembly.
7. The surgical robot of claim 6, wherein the guide tube comprises a ball detent to engage the one or more grooves to restrict rotational movement of the instrument assembly.
8. The surgical robot system of claim 5, wherein the guide tube contains a channel that engages with one groove of the instrument assembly to restrict rotational movement of the surgical instrument tool assembly.
9. A surgical robot system comprising:
a robot arm electronically coupled to the robot base, wherein the robot arm contains at least one depression and a magnet disposed proximate to each of the at least one depression;
a clamp containing one or more balls, each of the one or more balls configured to magnetically engage one of the at least one depression; and
an end-effector, electronically coupled to the robot base, configured to be coupled to the clamp.
10. The surgical robot system of claim 9, wherein the clamp is configured to fasten to end-effector and robot arm with a clamp handle that engages a lip on the end-effector and a lip on the robot arm.
11. A surgical robot system comprising:
a robot arm electronically coupled to the robot base; and
an end-effector electronically coupled to the robot base;
wherein the robot arm contains a primary coil and the end-effector contains a secondary coil and wherein power is transmitted from the primary coil to the secondary coil to wirelessly power the end-effector.
12. A surgical robot system comprising:
a dynamic reference base (DRB) attached to patient fixture instrument, wherein the dynamic reference base has one or more DRB markers indicating a position of the patient fixture instrument in a navigational space;
a registration fixture, having one or more registration markers, indicating a location of a target anatomical structure in the navigational space and one or more registration fiducials indicating a location of the target anatomical structure in an image space;
wherein the surgical robot system is configured to associate the location of the target anatomical structure with the patient fixture instrument in the navigational space and the image space taking into account (1) a relationship between the one or more registration markers and the one or more fiducials and (2) a relationship between the registration makers and the DRB markers, and
wherein the patient fixture instrument is located in a position different from the target anatomical structure.
13. The robot system of claim 12, further comprising a display configured to show a graphical representation of the target anatomical structure in relation to a surgical instrument, wherein the surgical instrument comprises instrument markers.
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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CRAWFORD, NEIL R.;THEODORE, NICHOLAS A.;FOSTER, MITCHELL;AND OTHERS;SIGNING DATES FROM 20160413 TO 20160502;REEL/FRAME:038556/0233