Patent Description:
Minimally invasive robotic surgical or telesurgical systems have been developed to increase a surgeon's dexterity and avoid some of the limitations on traditional minimally invasive techniques. In telesurgery, the surgeon uses some form of remote control (e.g., a servomechanism or the like) to manipulate surgical instrument movements, rather than directly holding and moving the instruments by hand. In telesurgery systems, the surgeon can be provided with an image of the surgical site at a surgical workstation. While viewing a two or three dimensional image of the surgical site on a display, the surgeon performs the surgical procedures on the patient by manipulating master control devices, which in turn control motion of the servo-mechanically operated instruments.

The servomechanism used for telesurgery will often accept input from two master controllers (one for each of the surgeon's hands) and may include two or more robotic arms on each of which a surgical instrument is mounted. Operative communication between master controllers and associated robotic arm and instrument assemblies is typically achieved through a control system. The control system typically includes at least one processor that relays input commands from the master controllers to the associated robotic arm and instrument assemblies and back from the instrument and arm assemblies to the associated master controllers in the case of, for example, force feedback or the like. One example of a robotic surgical system is the DA VINCI® system available from Intuitive Surgical, Inc. of Sunnyvale, Calif.

A variety of structural arrangements can be used to support the surgical instrument at the surgical site during robotic surgery. The driven linkage or "slave" is often called a robotic surgical manipulator, and exemplary linkage arrangements for use as a robotic surgical manipulator during minimally invasive robotic surgery are described in <CIT>; <CIT>; <CIT>; and <CIT>. These linkages often make use of a parallelogram arrangement to hold an instrument having a shaft. Such a manipulator structure can constrain movement of the instrument so that the instrument pivots about a remote center of manipulation positioned in space along the length of the rigid shaft. By aligning the remote center of manipulation with the incision point to the internal surgical site (for example, with a trocar or cannula at an abdominal wall during laparoscopic surgery), an end effector of the surgical instrument can be positioned safely by moving the proximal end of the shaft using the manipulator linkage without imposing potentially dangerous forces against the abdominal wall. Alternative manipulator structures are described, for example, in <CIT>;<CIT>; <CIT>; <CIT>;<CIT>;<CIT>; and <CIT>.

A variety of structural arrangements can also be used to support and position the robotic surgical manipulator and the surgical instrument at the surgical site during robotic surgery. Supporting linkage mechanisms, sometimes referred to as set-up joints, or set-up joint arms, are often used to position and align each manipulator with the respective incision point in a patient's body. The supporting linkage mechanism facilitates the alignment of a surgical manipulator with a desired surgical incision point and targeted anatomy. Exemplary supporting linkage mechanisms are described in <CIT> and<CIT>.

While the new telesurgical systems and devices have proven highly effective and advantageous, still further improvements are desirable. In general, improved minimally invasive robotic surgery systems are desirable. It would be particularly beneficial if these improved technologies enhanced the efficiency and ease of use of robotic surgical systems. For example, it would be particularly beneficial to increase maneuverability, improve space utilization in an operating room, provide a faster and easier set-up, inhibit collisions between robotic devices during use, and/or reduce the mechanical complexity and size of these new surgical systems.

<CIT> discloses a software center and highly configurable robotic system for surgery and other uses. In some embodiments the configurable robotic system includes a clutching mode where the user might manually articulate the manipulator assembly by applying haptic threshold-exceeding forces against appropriate structures of the manipulator assembly. The configurable robotic system remains in the clutching mode until the external articulation forces drop below a threshold value.

<CIT> discloses a medical robotic system with an operatively couplable simulator unit for surgeon training. The medical robotic system includes controllers or controller modules to provide friction and gravity compensation. The medical robotic system further includes a slave clutch button that, when depressed, interrupts the control loop so that the robotic arms may float relative to the master controls used to manipulate the robotic arms.

<CIT> is directed to a system and method for adjusting an image capturing device attribute using an unused degree-of-freedom of a master control device. The system and method include determining whether or not the image capturing device is being positioned or oriented by master controls before adjusting the image capturing device attribute. The system and method further determine whether the image capturing device is being positioned or oriented by the master controls by determining whether a velocity of the image capturing device or the master controls are above a threshold velocity.

The present invention provides an unclaimed method for configuring a robotic system and a robotic system as set out in the appended claims. The following presents a simplified summary of some embodiments of the invention in order to provide a basic understanding of the invention. This summary is not an extensive overview of the invention. It is not intended to identify key/critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some embodiments of the invention in a simplified form as a prelude to the more detailed description that is presented later.

The present disclosure generally provides improved robotic and/or surgical devices, systems, and methods. Kinematic linkage structures and associated control systems described herein are particularly beneficial in helping system users to arrange the robotic structure in preparation for use, including in preparation for a surgical procedure on a particular patient. Exemplary robotic surgical systems described herein may have one or more kinematic linkage subsystems that are configured to help align a manipulator structure with the surgical work site. The joints of these set-up systems may be actively driven, passive (so that they are manually articulated and then locked into the desired configuration while the manipulator is used therapeutically), or a mix of both. Embodiments of the robotic systems described herein may employ a set-up mode in which one or more joints are initially held static by a brake or joint drive system. Inadvertent articulation is limited by the brake or drive system, but the user can manually articulate the joint(s) by manually pushing against the linkage with a force, torque, or the like that exceeds a manual articulation threshold of the joint(s). Once the joint(s) begin to move, a processor may facilitate articulation with less user effort by modifying the signals transmitted to the brake or drive system. When the user arrives at a desired configuration, the system may sense that the user has completed the reconfiguration from a velocity of the joint(s) below a threshold, optionally for a desired dwell time. The system may then again inhibit inadvertent articulation of the joint(s). The dwell time can help avoid locking the linkage when reversing directions, and the system can provide a "detent" like manual articulation that is not limited to mechanically pre-defined detent joint configurations. Embodiments of the invention provide a user interface is intuitive, and can be particularly well-suited for manual movement of a platform supporting a plurality of surgical manipulators in a robotic surgical system or the like without having to add additional input devices.

In a first aspect, the disclosure provides a method for configuring a robotic system. The method comprises inhibiting manual articulation of a linkage of the system from a first pose in response to a first manual effort against the linkage being below a desired articulation threshold. A manual movement of the linkage from the first pose toward a second pose is facilitated in response to a second manual effort to articulate the linkage exceeding the desired articulation threshold. The second pose is determined in response to determining that a velocity of the manual movement is below a threshold velocity. Manual movement of the linkage from the second pose is inhibited.

Thus, in a first aspect, a method for configuring a robotic system is provided. The method includes inhibiting manual articulation of a linkage of the system from a first pose in response to a first manual effort against the linkage, facilitating a manual movement of the linkage from the first pose toward a second pose, determining the second pose in response to determining that a velocity of the manual movement is below a threshold velocity, and inhibiting manual movement of the linkage from the second pose. The inhibiting step is in response to a first manual effort against the linkage that is below a desired articulation threshold. The facilitating step is in response to a second manual effort against the linkage that exceeds the desired articulation threshold.

In other exemplary embodiments, a joint sensor may sense a first torque of the first manual effort applied to a joint and a processor may inhibit the manual articulation by determining drive signals configured to induce a counteracting torque to the linkage opposing the first torque so as to urge the linkage back toward the first pose. In further embodiments, the joint sensor may also sense the second torque of the second manual effort applied to the joint and the processor may be configured to determine that the second effort exceeds the desired articulation threshold. For example, in some embodiments the articulation threshold may be a torque threshold and the processor may determine that the second effort exceeds the desired articulation threshold by determining that the second torque exceeds the threshold torque. In response to a second effort exceeding the desired articulation threshold, the processor may alter the drive signals so as to decrease the counteracting torque so that the first torque is sufficient to manually move the manipulator.

In some embodiments of the method, a processor may alter drive signals in response to the second effort exceeding the desired articulation threshold by adding a friction compensation component to the drive signals so as to mitigate friction of the linkage for the manual movement toward the second pose.

In other embodiments, the second pose may be determined by determining that a velocity of the manual movement is below a threshold velocity. Additionally, the second pose may also be determined by determining that the velocity of the manual movement remains below the threshold velocity for a threshold dwell time so as to facilitate reversing a direction of the movement without inhibiting manual movement.

In further embodiments, the method for configuring a robotic system includes driving the linkage in the second pose with drive signals so as to inhibit manual movement of the linkage from the second pose in response to a third manual effort against the manipulator being below the desired articulation threshold.

The above exemplary methods may be used to configure a surgical robotic system. For example, the linkage may be a set-up structure having a proximal base and a platform with the joint disposed therebetween. The platform may support a plurality of surgical manipulators, where each manipulator may be an instrument holder configured to releasably receive a surgical instrument. The manual movement may be a movement that alters positions of the plurality of manipulators relative to a surgical site. In another example, the linkage may be included in a surgical manipulator having a holder for releasably receiving a surgical instrument. The surgical manipulator may also include a cannula interface configured for releasably receiving a cannula. The manipulator may be further configured to pivotably move a shaft of the instrument within an aperture adjacent the cannula so as to manipulate an end effector of the instrument within a minimally invasive surgical aperture. The configuration method may further include inhibiting manual articulation of the joint with manual effort exceeding the desired articulation threshold in response to the mounting of the cannula to the cannula interface.

In another aspect, a robotic system is provided. The robotic system includes a linkage having a joint, a drive or brake system coupled to the linkage, and a processor coupled with the drive or brake system. The processor may be configured to transmit signals to the drive or brake system so as to inhibit manual articulation of the linkage from a first pose in response to a first manual effort against the linkage being below a desired articulation threshold. The processor may alter the signals in response to a second manual effort to articulate the linkage exceeding the desired articulation threshold. The altered signals may be configured to facilitate a manual movement of the linkage from the first pose toward a second pose. The processor may also determine the second pose in response to detecting that a velocity of the manual movement is below a first threshold velocity and may transmit the signals to the drive system so as to inhibit manual movement of the linkage from the second pose.

In additional exemplary embodiments, the robotic system further includes a joint sensor coupled to the joint. The joint sensor may be configured to sense a first torque of the first manual effort applied to the joint. The processor may be configured to determine the signals so as to apply a counteracting torque to the linkage opposing the first torque and urge the linkage back toward the first pose. In particular embodiments, a drive or brake system may include a drive system. Further, the joint sensor may be configured so as to transmit to the processor a second torque of the second manual effort applied to the joint. The processor may be further configured to determine if the second effort exceeds the desired articulation threshold using the second torque. For example, the processor may be configured to determine that the second effort exceeds the desired articulation threshold by determining whether the second torque exceeds a threshold torque. In response to a second effort exceeding the desired articulation threshold, the processor may alter the drive signals so as to decrease the counteracting torque so that the first torque is sufficient to manually move the manipulator.

In some embodiments, the signals of the robotic system may include drive signals and the processor may be configured to alter the drive signals in response to the second effort exceeding the desired articulation threshold by adding a friction compensation component to the drive signals so as to mitigate friction of the linkage for the manual movement toward the second pose.

The processor may be configured to determine a second pose in response to a velocity of the manual movement being below a threshold velocity. The processor may be further configured to determine the second pose by determining that the velocity of the manual movement is below the threshold velocity for a threshold dwell time so as to facilitate a reversal of a direction of the manual movement without inhibiting the manual movement. The processor may also be configured to inhibit manual movement of the linkage from the second pose in response to a third manual effort against the manipulator being below the desired articulation threshold.

The above exemplary system may be a surgical robotic system. For example, the linkage may be a set-up structure having a proximal base and a platform with the joint disposed therebetween. The platform may support a plurality of surgical manipulators, where each manipulator may be an instrument holder configured to releasably receive a surgical instrument. The manual movement may be a movement that alters positions of the plurality of manipulators relative to a surgical site. In another example, the linkage may be included in a surgical manipulator having a holder for releasably receiving a surgical instrument. The surgical manipulator may also include a cannula interface configured for releasably receiving a cannula. The manipulator may be further configured to pivotably move a shaft of the instrument within an aperture adjacent the cannula so as to manipulate an end effector of the instrument within a minimally invasive surgical aperture. The system may further include inhibiting manual articulation of the joint with manual effort exceeding the desired articulation threshold in response to the mounting of the cannula to the cannula interface.

In an embodiment, a robotic surgical system is provided. The robotic surgical system includes a linkage having a joint, a torque sensor system coupled to the joint, and a processor coupling the torque sensor with the drive system. The joint may be disposed between a proximal base and an instrument holder. The instrument holder may be configured for releasably supporting a surgical instrument. The processor is configured to transmit drive signals to the drive system so as to inhibit manual articulation of the joint from a first configuration in response to a sensed torque being below a desired articulation threshold. In response to a sensed torque exceeding the desired articulation threshold, the processor may alter the drive signals to facilitate a manual movement of the joint from the first configuration toward a second configuration using a movement torque lower than the articulation threshold. In response to a velocity of the manual movement being below a threshold velocity, the processor may determine the second configuration. The processor may also be configured to transmit drive signals to the drive system so as to inhibit manual movement of the linkage from the second pose in response to a sensed torque being below a desired articulation threshold.

Also disclosed is a method of configuring a robotic system. The method includes driving a robotic assembly during manual efforts to move a linkage of the assembly so as to simulate a first and second detent of the linkage at first and second linkage poses. The method also includes determining the second pose in response to a manual movement of the linkage to the second pose.

For a fuller understanding of the nature and advantages of the present invention, reference should be made to the ensuing detailed description and accompanying drawings. Other aspects, objects and advantages of the invention will be apparent from the drawings and detailed description that follows.

In the following description, various embodiments of the present invention will be described. However, it will also be apparent to one skilled in the art that the present invention may be practiced without the specific details.

The kinematic linkage structures and control systems described herein are particularly beneficial in helping system users to arrange the robotic structure of a procedure on a particular patient. Along with actively driven manipulators used to interact with tissues and the like during treatment, robotic surgical systems may have one or more kinematic linkage systems that are configured to support and help align the manipulator structure with the surgical work site. These set-up systems may be actively driven or may be passive, so that they are manually articulated and then locked into the desired configuration while the manipulator is used therapeutically. The passive set-up kinematic systems may have advantages in size, weight, complexity, and cost. Unfortunately, a plurality of manipulators may be used to treat tissues of each patient, the manipulators may each independently benefit from accurate positioning so as to allow the instrument supported by that instrument to have the desired motion throughout the workspace, and minor changes in the relative locations of adjacent manipulators may have significant impact on the interactions between manipulators (with poorly positioned manipulators potentially colliding or having their range and/or ease of motion significantly reduced). Hence, the challenges of quickly arranging the robotic system in preparation for surgery can be significant.

One option is to mount multiple manipulators to a single platform, with the manipulator-supporting platform sometimes being referred to as an orienting platform. The orienting platform can be supported by an actively driven support linkage (sometimes referred to herein as a set-up structure, and typically having a set-up structure linkage, etc.) The system may also provide and control motorized axes of the robotic set-up structure supporting the orienting platform with some kind of joystick or set of buttons that would allow the user to actively drive those axes as desired in an independent fashion. This approach, while useful in some situations, may suffer from some disadvantages. In particular, it may be difficult to locate a drive button for all the elements of a complex system so that each is accessible to users approaching the system in all its potential configurations. While individual clutch buttons might also be used to release the brake or drive system, the possibility of confusion may remain between buttons having different functions. Furthermore, both sterile and non-sterile members of a surgical team may want to articulate some joints or linkages (such as by grabbing differing locations inside or outside the sterile field). Hence a more intuitive and flexible user interface would be desirable. This is particularly true of an orienting platform for use in multi-quadrant surgery, or for a structure that supports a plurality of surgical manipulators and may pivot about an axis extending at least roughly vertically so as to orient the manipulators relative to a patient on a surgical table or other support.

Referring now to the drawings, in which like reference numerals represent like parts throughout the several views, <FIG> is a plan view illustration of a Minimally Invasive Robotic Surgical (MIRS) system <NUM>, typically used for performing a minimally invasive diagnostic or surgical procedure on a Patient <NUM> who is lying down on an Operating table <NUM>. The system can include a Surgeon's Console <NUM> for use by a Surgeon <NUM> during the procedure. One or more Assistants <NUM> may also participate in the procedure. The MIRS system <NUM> can further include a Patient Side Cart <NUM> (surgical robot) and an Electronics Cart <NUM>. The Patient Side Cart <NUM> can manipulate at least one removably coupled tool assembly <NUM> (hereinafter simply referred to as a "tool") through a minimally invasive incision in the body of the Patient <NUM> while the Surgeon <NUM> views the surgical site through the Console <NUM>. An image of the surgical site can be obtained by an endoscope <NUM>, such as a stereoscopic endoscope, which can be manipulated by the Patient Side Cart <NUM> to orient the endoscope <NUM>. The Electronics Cart <NUM> can be used to process the images of the surgical site for subsequent display to the Surgeon <NUM> through the Surgeon's Console <NUM>. The number of surgical tools <NUM> used at one time will generally depend on the diagnostic or surgical procedure and the space constraints within the operating room among other factors. If it is necessary to change one or more of the tools <NUM> being used during a procedure, an Assistant <NUM> may remove the tool <NUM> from the Patient Side Cart <NUM>, and replace it with another tool <NUM> from a tray <NUM> in the operating room.

<FIG> is a perspective view of the Surgeon's Console <NUM>. The Surgeon's Console <NUM> includes a left eye display <NUM> and a right eye display <NUM> for presenting the Surgeon <NUM> with a coordinated stereo view of the surgical site that enables depth perception. The Console <NUM> further includes one or more input control devices <NUM>, which in turn cause the Patient Side Cart <NUM> (shown in <FIG>) to manipulate one or more tools. The input control devices <NUM> can provide the same degrees of freedom as their associated tools <NUM> (shown in <FIG>) to provide the Surgeon with telepresence, or the perception that the input control devices <NUM> are integral with the tools <NUM> so that the Surgeon has a strong sense of directly controlling the tools <NUM>. To this end, position, force, and tactile feedback sensors (not shown) may be employed to transmit position, force, and tactile sensations from the tools <NUM> back to the Surgeon's hands through the input control devices <NUM>.

The Surgeon's Console <NUM> is usually located in the same room as the patient so that the Surgeon may directly monitor the procedure, be physically present if necessary, and speak to an Assistant directly rather than over the telephone or other communication medium. However, the Surgeon can be located in a different room, a completely different building, or other remote location from the Patient allowing for remote surgical procedures.

<FIG> is a perspective view of the Electronics Cart <NUM>. The Electronics Cart <NUM> can be coupled with the endoscope <NUM> and can include a processor to process captured images for subsequent display, such as to a Surgeon on the Surgeon's Console, or on another suitable display located locally and/or remotely. For example, where a stereoscopic endoscope is used, the Electronics Cart <NUM> can process the captured images to present the Surgeon with coordinated stereo images of the surgical site. Such coordination can include alignment between the opposing images and can include adjusting the stereo working distance of the stereoscopic endoscope. As another example, image processing can include the use of previously determined camera calibration parameters to compensate for imaging errors of the image capture device, such as optical aberrations.

<FIG> diagrammatically illustrates a robotic surgery system <NUM> (such as MIRS system <NUM> of <FIG>). As discussed above, a Surgeon's Console <NUM> (such as Surgeon's Console <NUM> in <FIG>) can be used by a Surgeon to control a Patient Side Cart (Surgical Robot) <NUM> (such as Patent Side Cart <NUM> in <FIG>) during a minimally invasive procedure. The Patient Side Cart <NUM> can use an imaging device, such as a stereoscopic endoscope, to capture images of the procedure site and output the captured images to an Electronics Cart <NUM> (such as the Electronics Cart <NUM> in <FIG>). As discussed above, the Electronics Cart <NUM> can process the captured images in a variety of ways prior to any subsequent display. For example, the Electronics Cart <NUM> can overlay the captured images with a virtual control interface prior to displaying the combined images to the Surgeon via the Surgeon's Console <NUM>. The Patient Side Cart <NUM> can output the captured images for processing outside the Electronics Cart <NUM>. For example, the Patient Side Cart <NUM> can output the captured images to a processor <NUM>, which can be used to process the captured images. The images can also be processed by a combination the Electronics Cart <NUM> and the processor <NUM>, which can be coupled together to process the captured images jointly, sequentially, and/or combinations thereof. One or more separate displays <NUM> can also be coupled with the processor <NUM> and/or the Electronics Cart <NUM> for local and/or remote display of images, such as images of the procedure site, or other related images.

Processor <NUM> will typically include a combination of hardware and software, with the software comprising tangible media embodying computer readable code instructions for performing the method steps of the control functionally described herein. The hardware typically includes one or more data processing boards, which may be co-located but will often have components distributed among the robotic structures described herein. The software will often comprise a nonvolatile media, and could also comprise a monolithic code but will more typically comprise a number of subroutines, optionally running in any of a wide variety of distributed data processing architectures.

<FIG> and <FIG> show a Patient Side Cart <NUM> and a surgical tool <NUM>, respectively. The surgical tool <NUM> is an example of the surgical tools <NUM>. The Patient Side Cart <NUM> shown provides for the manipulation of three surgical tools <NUM> and an imaging device <NUM>, such as a stereoscopic endoscope used for the capture of images of the site of the procedure. Manipulation is provided by robotic mechanisms having a number of robotic joints. The imaging device <NUM> and the surgical tools <NUM> can be positioned and manipulated through incisions in the patient so that a kinematic remote center is maintained at the incision to minimize the size of the incision. Images of the surgical site can include images of the distal ends of the surgical tools <NUM> when they are positioned within the field-of-view of the imaging device <NUM>.

Surgical tools <NUM> are inserted into the patient by inserting a tubular cannula <NUM> through a minimally invasive access aperture such as an incision, natural orifice, percutaneous penetration, or the like. Cannula <NUM> is mounted to the robotic manipulator arm and the shaft of surgical tool <NUM> passes through the lumen of the cannula. The manipulator arm may transmit signals indicating that the cannula has been mounted thereon.

<FIG> is a perspective schematic representation of a robotic surgery system <NUM>, in accordance with many embodiments. The surgery system <NUM> includes a mounting base <NUM>, a support linkage <NUM>, an orienting platform <NUM>, a plurality of outer set-up linkages <NUM> (two shown), a plurality of inner set-up linkages <NUM> (two shown), and a plurality of surgical instrument manipulators <NUM>. Each of the manipulators <NUM> is operable to selectively articulate a surgical instrument mounted to the manipulator <NUM> and insertable into a patient along an insertion axis. Each of the manipulators <NUM> is attached to and supported by one of the set-up linkages <NUM>, <NUM>. Each of the outer set-up linkages <NUM> is rotationally coupled to and supported by the orienting platform <NUM> by a first set-up linkage joint <NUM>. Each of the inner set-up linkages <NUM> is fixedly attached to and supported by the orienting platform <NUM>. The orienting platform <NUM> is rotationally coupled to and supported by the support linkage <NUM>. And the support linkage <NUM> is fixedly attached to and supported by the mounting base <NUM>.

In many embodiments, the mounting base <NUM> is a movable and floor supported, thereby enabling selective repositioning of the overall surgery system <NUM>, for example, within an operating room. The mounting base <NUM> can include a steerable wheel assembly and/or any other suitable support features that provide for both selective repositioning as well as selectively preventing movement of the mounting base <NUM> from a selected position. The mounting base <NUM> can also have other suitable configurations, for example, a ceiling mount, fixed floor/pedestal mount, a wall mount, or an interface configured for being supported by any other suitable mounting surface.

The support linkage <NUM> is operable to selectively position and/or orient the orienting platform <NUM> relative to the mounting base <NUM>. The support linkage <NUM> includes a column base <NUM>, a translatable column member <NUM>, a shoulder joint <NUM>, a boom base member <NUM>, a boom first stage member <NUM>, a boom second stage member <NUM>, and a wrist joint <NUM>. The column base <NUM> is fixedly attached to the mounting base <NUM>. The translatable column member <NUM> is slideably coupled to the column base <NUM> for translation relative to column base <NUM>. In many embodiments, the translatable column member <NUM> translates relative to the column base <NUM> along a vertically oriented axis. The boom base member <NUM> is rotationally coupled to the translatable column member <NUM> by the shoulder joint <NUM>. The shoulder joint <NUM> is operable to selectively orient the boom base member <NUM> in a horizontal plane relative to the translatable column member <NUM>, which has a fixed angular orientation relative to the column base <NUM> and the mounting base <NUM>. The boom first stage member <NUM> is selectively translatable relative to the boom base member <NUM> in a horizontal direction, which in many embodiments is aligned with both the boom base member <NUM> and the boom first stage member <NUM>. The boom second stage member <NUM> is likewise selectively translatable relative to the boom first stage member <NUM> in a horizontal direction, which in many embodiments is aligned with the boom first stage member <NUM> and the boom second stage member <NUM>. Accordingly, the support linkage <NUM> is operable to selectively set the distance between the shoulder joint <NUM> and the distal end of the boom second stage member <NUM>. The wrist joint <NUM> rotationally couples the distal end of the boom second stage member <NUM> to the orienting platform <NUM>. The wrist joint <NUM> is operable to selectively set the angular orientation of the orienting platform <NUM> relative to the mounting base <NUM>.

Each of the set-up linkages <NUM>, <NUM> is operable to selectively position and/or orient the associated manipulator <NUM> relative to the orienting platform <NUM>. Each of the set-up linkages <NUM>, <NUM> includes a set-up linkage base link <NUM>, a set-up linkage extension link <NUM>, a set-up linkage parallelogram linkage portion <NUM>, a set-up linkage vertical link <NUM>, a second set-up linkage joint <NUM>, and a manipulator support link <NUM>. In each of the set-up linkage base links <NUM> of the outer set-up linkages <NUM> can be selectively oriented relative to the orienting platform <NUM> via the operation of the a first set-up linkage joint <NUM>. In the embodiment shown, each of the set-up linkage base links <NUM> of the inner set-up linkages <NUM> is fixedly attached to the orienting platform <NUM>. Each of the inner set-up linkages <NUM> can also be rotationally attached to the orienting platform <NUM> similar to the outer set-up linkages via an additional first set-up linkage joints <NUM>. Each of the set-up linkage extension links <NUM> is translatable relative to the associated set-up linkage base link <NUM> in a horizontal direction, which in many embodiments is aligned with the associated set-up linkage base link and the set-up linkage extension link <NUM>. Each of the set-up linkage parallelogram linkage portions <NUM> configured and operable to selectively translate the set-up linkage vertical link <NUM> in a vertical direction while keeping the set-up linkage vertical link <NUM> vertically oriented. In example embodiments, each of the set-up linkage parallelogram linkage portions <NUM> includes a first parallelogram joint <NUM>, a coupling link <NUM>, and a second parallelogram <NUM>. The first parallelogram joint <NUM> rotationally couples the coupling link <NUM> to the set-up linkage extension link <NUM>. The second parallelogram joint <NUM> rotationally couples the set-up linkage vertical link <NUM> to the coupling link <NUM>. The first parallelogram joint <NUM> is rotationally tied to the second parallelogram joint <NUM> such that rotation of the coupling link <NUM> relative to the set-up linkage extension link <NUM> is matched by a counteracting rotation of the set-up linkage vertical link <NUM> relative to the coupling link <NUM> so as to maintain the set-up linkage vertical link <NUM> vertically oriented while the set-up linkage vertical link <NUM> is selectively translated vertically. The second set-up linkage joint <NUM> is operable to selectively orient the manipulator support link <NUM> relative to the set-up linkage vertical link <NUM>, thereby selectively orienting the associated attached manipulator <NUM> relative to the set-up linkage vertical link <NUM>.

<FIG> is a perspective schematic representation of a robotic surgery system <NUM>, in accordance with many embodiments. Because the surgery system <NUM> includes components similar to components of the surgery system <NUM> of <FIG>, the same reference numbers are used for similar components and the corresponding description of the similar components set forth above is applicable to the surgery system <NUM> and is omitted here to avoid repetition. The surgery system <NUM> includes the mounting base <NUM>, a support linkage <NUM>, an orienting platform <NUM>, a plurality of set-up linkages <NUM> (four shown), and a plurality of the surgical instrument manipulators <NUM>. Each of the manipulators <NUM> is operable to selectively articulate a surgical instrument mounted to the manipulator <NUM> and insertable into a patient along an insertion axis. Each of the manipulators <NUM> is attached to and supported by one of the set-up linkages <NUM>. Each of the set-up linkages <NUM> is rotationally coupled to and supported by the orienting platform <NUM> by the first set-up linkage joint <NUM>. The orienting platform <NUM> is rotationally coupled to and supported by the support linkage <NUM>. And the support linkage <NUM> is fixedly attached to and supported by the mounting base <NUM>.

The support linkage <NUM> is operable to selectively position and/or orient the orienting platform <NUM> relative to the mounting base <NUM>. The support linkage <NUM> includes the column base <NUM>, the translatable column member <NUM>, the shoulder joint <NUM>, the boom base member <NUM>, the boom first stage member <NUM>, and the wrist joint <NUM>. The support linkage <NUM> is operable to selectively set the distance between the shoulder joint <NUM> and the distal end of the boom first stage member <NUM>. The wrist joint <NUM> rotationally couples the distal end of the boom first stage member <NUM> to the orienting platform <NUM>. The wrist joint <NUM> is operable to selectively set the angular orientation of the orienting platform <NUM> relative to the mounting base <NUM>.

Each of the set-up linkages <NUM> is operable to selectively position and/or orient the associated manipulator <NUM> relative to the orienting platform <NUM>. Each of the set-up linkages <NUM> includes the set-up linkage base link <NUM>, the set-up linkage extension link <NUM>, the set-up linkage vertical link <NUM>, the second set-up linkage joint <NUM>, a tornado mechanism support link <NUM>, and a tornado mechanism <NUM>. Each of the set-up linkage base links <NUM> of the set-up linkages <NUM> can be selectively oriented relative to the orienting platform <NUM> via the operation of the associated first set-up linkage joint <NUM>. Each of the set-up linkage vertical links <NUM> is selectively translatable in a vertical direction relative to the associated set-up linkage extension link <NUM>. The second set-up linkage joint <NUM> is operable to selectively orient the tornado mechanism support link <NUM> relative to the set-up linkage vertical link <NUM>.

Each of the tornado mechanisms <NUM> includes a tornado joint <NUM>, a coupling link <NUM>, and a manipulator support <NUM>. The coupling link <NUM> fixedly couples the manipulator support <NUM> to the tornado joint <NUM>. The tornado joint <NUM> is operable to rotate the manipulator support <NUM> relative to the tornado mechanism support link <NUM> around a tornado axis <NUM>. The tornado mechanism <NUM> is configured to position and orient the manipulator support <NUM> such that the remote center of manipulation (RC) of the manipulator <NUM> is intersected by the tornado axis <NUM>. Accordingly, operation of the tornado joint <NUM> can be used to reorient the associated manipulator <NUM> relative to the patient without moving the associated remote center of manipulation (RC) relative to the patient.

<FIG> is a simplified representation of a robotic surgery system <NUM>, in accordance with many embodiments, in conformance with the schematic representation of the robotic surgery system <NUM> of <FIG>. Because the surgery system <NUM> conforms to the robotic surgery system <NUM> of <FIG>, the same reference numbers are used for analogous components and the corresponding description of the analogous components set forth above is applicable to the surgery system <NUM> and is omitted here to avoid repetition.

The support linkage <NUM> is configured to selectively position and orient the orienting platform <NUM> relative to the mounting base <NUM> via relative movement between links of the support linkage <NUM> along multiple set-up structure axes. The translatable column member <NUM> is selectively repositionable relative to the column base <NUM> along a first set-up structure (SUS) axis <NUM>, which is vertically oriented in many embodiments. The shoulder joint <NUM> is operable to selectively orient the boom base member <NUM> relative to the translatable column member <NUM> around a second SUS axis <NUM>, which is vertically oriented in many embodiments. The boom first stage member <NUM> is selectively repositionable relative to the boom base member <NUM> along a third SUS axis <NUM>, which is horizontally oriented in many embodiments. The wrist joint <NUM> is operable to selectively orient the orienting platform <NUM> relative to the boom first stage member <NUM> around a fourth SUS axis <NUM>, which is vertically oriented in many embodiments.

Each of the set-up linkages <NUM> is configured to selectively position and orient the associated manipulator <NUM> relative to the orienting platform <NUM> via relative movement between links of the set-up linkage <NUM> along multiple set-up joint (SUJ) axes. Each of the first set-up linkage joint <NUM> is operable to selectively orient the associated set-up linkage base link <NUM> relative to the orienting platform <NUM> around a first SUJ axis <NUM>, which in many embodiments is vertically oriented. Each of the set-up linkage extension links <NUM> can be selectively repositioned relative to the associated set-up linkage base link <NUM> along a second SUJ axis <NUM>, which is horizontally oriented in many embodiments. Each of the set-up linkage vertical links <NUM> can be selectively repositioned relative to the associated set-up linkage extension link <NUM> along a third SUJ axis <NUM>, which is vertically oriented in many embodiments. Each of the second set-up linkage joints <NUM> is operable to selectively orient the tornado mechanism support link <NUM> relative to the set-up linkage vertical link <NUM> around the third SUJ axis <NUM>. Each of the tornado joints <NUM> is operable to rotate the associated manipulator <NUM> around the associated tornado axis <NUM>.

<FIG> illustrates rotational orientation limits of the set-up linkages <NUM> relative to the orienting platform <NUM>, in accordance with many embodiments. Each of the set-up linkages <NUM> is shown in a clockwise limit orientation relative to the orienting platform <NUM>. A corresponding counter-clockwise limit orientation is represented by a mirror image of <FIG> relative to a vertically-oriented mirror plane. As illustrated, each of the two inner set-up linkages <NUM> can be oriented from <NUM> degrees from a vertical reference <NUM> in one direction to <NUM> degrees from the vertical reference <NUM> in the opposite direction. And as illustrated, each of the two outer set-up linkages can be oriented from <NUM> degrees to <NUM> degrees from the vertical reference <NUM> in a corresponding direction.

In use, it will often be desirable for a surgical assistant, surgeon, technical support, or other user to configure some or all of the linkages of robotic surgical system <NUM> for surgery, including the set-up structure linkage, the set-up joints, and/or each of the manipulators. Included among the task in configuring these linkages will be positioning the orienting platform <NUM> relative to first stage member <NUM> about vertical fourth SUS axis <NUM> of wrist joint <NUM>. A joint drive motor <NUM> and/or brake system <NUM> is coupled to wrist joint <NUM>, with one exemplary embodiment including both a drive <NUM> and brake <NUM>. Additionally, a joint sensor system will typically sense an angular configuration or position of wrist joint <NUM>.

An exemplary user interface, system, and method for manually configuring the system for use will be described herein with reference to manual articulation of orienting platform <NUM> by articulation of wrist joint <NUM> about fourth SUS axis <NUM>, as schematically illustrated by arrow <NUM>. It should be understood that alternative embodiments may be employed to articulate one or more alternative joints of the overall kinematic system, including one or more alternative joints of the set-up structure, one or more of the set-up joints, or one or more of the joints of the manipulators linkages. Use of the exemplary embodiment for articulating the motorized wrist joint embodiments may allow a user to efficiently position manipulators <NUM>. The manual articulation of wrist joint <NUM> as described herein can improve speed and ease of use while manually docking manipulators <NUM> to their associated cannulas <NUM>, as shown in <FIG>.

<FIG> shows a center of gravity diagram associated with a rotational limit of a support linkage for a robotic surgery system <NUM>, in accordance with many embodiments. With components of the robotic surgery system <NUM> positioned and oriented to shift the center-of-gravity <NUM> of the robotic surgery system <NUM> to a maximum extent to one side relative to a support linkage <NUM> of the surgery system <NUM>, a shoulder joint of the support linkage <NUM> can be configured to limit rotation of the support structure <NUM> around a set-up structure (SUS) shoulder-joint axis <NUM> to prevent exceeding a predetermined stability limit of the mounting base.

<FIG> schematically illustrates a method for positioning orienting platform <NUM> by articulating wrist joint <NUM>. As generally described above, robotic system <NUM> may be used in a master following mode to treat tissues and the like. The robotic system will typically halt following, and will start <NUM> a configuration mode which allows a user to manually configure the orienting platform in a desired orientation about fourth SUS axis <NUM>. Once the configuration mode has been entered, the current angle θC of wrist joint <NUM>, as sensed by the joint sensor system, is set as the desired angle θD in step <NUM>. If a cannula is mounted to any of the manipulators supported by platform <NUM>, the system may apply the brake to the wrist joint and exit the configuration mode so as to inhibit manual movement of the wrist joint via step <NUM>.

While in the configuration mode, when the platform is not moving about the wrist joint the system processor will typically transmit signals to the joint motor associated with wrist joint <NUM> so as to maintain the set desired angle θD. Hence, when the system is bumped, pushed, or pulled lightly the wrist motor may urge the platform back toward the desired angle by applying a joint torque per an error E that varies with the difference between the sensed joint position and the desired joint position: <MAT> This driving of the joint toward the desired pose in step <NUM> will often be limited to allow a user to overcome the servoing of the wrist joint by applying sufficient effort <NUM> against the linkage system. For example, when the joint sensing system indicates a displacement of the joint beyond a threshold amount, when the torque being applied to the motor to counteract the applied force reaches a threshold amount, when a sensed force applied to the linkage system distally of the joint exceeds a threshold amount, or the like, the processor may halt servoing of the wrist joint to counteract articulation of the joint. In some embodiments there may be a time element of the effort threshold to overcome the servoing, such as by halting servoing in response to a torque that exceeds a threshold for a time that exceeds a threshold. Still other options are possible, including more complex relationships between the threshold force or torque and time, sensing that the force is applied to a particular linkage or subset of linkages supported by the wrist (or other articulatable joint), and the like. In an exemplary embodiment, a joint sensor between the orienting platform and the rest of the setup structure system provides a signal used to estimate torque applied to the orienting platform, and the joint displacement and servo stiffness are used to estimate a disturbance torque applied to the surgical arms and/or setup joints. In an additional exemplary embodiment, the error signal may be filtered so as to make the system more sensitive to transient pushes than slow or steady-state signals. Such error filtering may make the trigger more sensitive while limiting false triggers when the setup structure is on a sloped surface.

When a user pushes or pulls on one or more of the surgical manipulators, the set-up joint linkages, or directly on the platform with an effort sufficient to exceed the desired articulation threshold the user is able to rotate the orienting platform without having to fight the servo control. Although servoing so as to counteract the user movement of the platform is halted in step <NUM>, drive signals may still be sent to the wrist motor. For example, friction compensation, gravity compensation, momentum compensation, and or the like may be provided <NUM> by applying appropriate drive signals during manual movement of the platform. Exemplary compensation drive systems are more fully described in <CIT> and entitled "Friction Compensation in a Minimally Invasive Surgical Apparatus," in <CIT>et al. and entitled "Control System for Reducing Internally Generated Frictional and Inertial Resistance to Manual Positioning of a Surgical Manipulator," and the like. In some embodiments, the system may employ joint range of motion limits alone or in addition to the drive signals when servoing is halted. Such range of motion limits may respond similar to servoing when a user pushes beyond a range motion limit except they are one sided.

Once the user has manually articulated to wrist near the desired orientation, the user will tend to slow the platform down and upon reaching the desired configuration will halt movement of the platform. The system takes advantage of this, and as the joint sensor indicates that movement of the platform falls below a desired threshold of zero the processor may, in response, re-set the desired joint angle and re-initiate servoing (or braking) so as to inhibit movement from that joint position. As the user may want to reverse direction of the manual joint articulation to correct any overshoot, the processor may not re-engage the servo until the articulation speed remains below a threshold for a desired dwell period.

Thus, while the invention is susceptible to various modifications and alternative constructions, certain illustrated embodiments thereof are shown in the drawings and have been described above in detail. It should be understood, however, that there is no intention to limit the invention to the specific form or forms disclosed, but on the contrary, the intention is to cover all modifications, alternative constructions, and equivalents falling within the scope of the invention, as defined in the appended claims.

The use of the terms "a" and "an" and "the" and similar referents in the context of describing the invention (especially in the context of the following claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The term "connected" is to be construed as partly or wholly contained within, attached to, or joined together, even if there is something intervening. The use of any and all examples, or exemplary language (e.g., "such as") provided herein, is intended merely to better illuminate embodiments of the invention and does not pose a limitation on the scope of the invention unless otherwise claimed.

Claim 1:
A robotic system comprising:
a linkage (<NUM>) coupled to a joint (<NUM>);
a drive (<NUM>) or brake system (<NUM>) coupled to the joint (<NUM>); and
a joint sensor configured to sense torques applied to the joint (<NUM>) by manual efforts of a user;
a manipulator (<NUM>) coupled to linkage (<NUM>); and
a processor, characterized in that the processor is configured to:
transmit signals to the drive (<NUM>) or brake system (<NUM>) so as to inhibit manual articulation of the linkage (<NUM>) by the user from a first pose in response to a first manual effort by the user against the linkage (<NUM>) being below a desired articulation threshold;
alter the signals in response to a second manual effort by the user to articulate the linkage (<NUM>) exceeding the desired articulation threshold, wherein the altered signals are configured to facilitate a manual movement of the linkage (<NUM>) from the first pose toward a second pose by the user; and
inhibit, in response to a mounting of a cannula to the manipulator (<NUM>), manual articulation of the joint (<NUM>) by the user with the second manual effort to articulate the linkage (<NUM>) exceeding the desired articulation threshold, wherein the mounting of the cannula is determined based on signals transmitted by the manipulator (<NUM>).