US20110022078A1 - Articulating mechanism - Google Patents
Articulating mechanism Download PDFInfo
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- US20110022078A1 US20110022078A1 US12/508,478 US50847809A US2011022078A1 US 20110022078 A1 US20110022078 A1 US 20110022078A1 US 50847809 A US50847809 A US 50847809A US 2011022078 A1 US2011022078 A1 US 2011022078A1
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- component
- convex
- articulating mechanism
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- channels
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/28—Surgical forceps
- A61B17/29—Forceps for use in minimally invasive surgery
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J17/00—Joints
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/28—Surgical forceps
- A61B17/29—Forceps for use in minimally invasive surgery
- A61B17/2909—Handles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C11/00—Pivots; Pivotal connections
- F16C11/04—Pivotal connections
- F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
- F16C11/0614—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints the female part of the joint being open on two sides
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/00234—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery
- A61B2017/00292—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery mounted on or guided by flexible, e.g. catheter-like, means
- A61B2017/003—Steerable
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/00234—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery
- A61B2017/00292—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery mounted on or guided by flexible, e.g. catheter-like, means
- A61B2017/003—Steerable
- A61B2017/00305—Constructional details of the flexible means
- A61B2017/00314—Separate linked members
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/00234—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery
- A61B2017/00292—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery mounted on or guided by flexible, e.g. catheter-like, means
- A61B2017/003—Steerable
- A61B2017/00318—Steering mechanisms
- A61B2017/00323—Cables or rods
- A61B2017/00327—Cables or rods with actuating members moving in opposite directions
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/28—Surgical forceps
- A61B17/29—Forceps for use in minimally invasive surgery
- A61B2017/2901—Details of shaft
- A61B2017/2908—Multiple segments connected by articulations
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/28—Surgical forceps
- A61B17/29—Forceps for use in minimally invasive surgery
- A61B17/2909—Handles
- A61B2017/291—Handles the position of the handle being adjustable with respect to the shaft
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/28—Surgical forceps
- A61B17/29—Forceps for use in minimally invasive surgery
- A61B17/2909—Handles
- A61B2017/2911—Handles rings
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/28—Surgical forceps
- A61B17/29—Forceps for use in minimally invasive surgery
- A61B17/2909—Handles
- A61B2017/2925—Pistol grips
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/28—Surgical forceps
- A61B17/29—Forceps for use in minimally invasive surgery
- A61B2017/2926—Details of heads or jaws
- A61B2017/2927—Details of heads or jaws the angular position of the head being adjustable with respect to the shaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2316/00—Apparatus in health or amusement
- F16C2316/10—Apparatus in health or amusement in medical appliances, e.g. in diagnosis, dentistry, instruments, prostheses, medical imaging appliances
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/32—Articulated members
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/32—Articulated members
- Y10T403/32008—Plural distinct articulation axes
- Y10T403/32032—Plural ball and socket
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/32—Articulated members
- Y10T403/32606—Pivoted
- Y10T403/32631—Universal ball and socket
- Y10T403/32639—Universal ball and socket including internal tie means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/20—Control lever and linkage systems
- Y10T74/20207—Multiple controlling elements for single controlled element
- Y10T74/20305—Robotic arm
- Y10T74/20323—Robotic arm including flaccid drive element
Definitions
- articulating tools are provided with improved articulating mechanisms as well as methods of assembling such tools.
- the articulating tool is appropriate for multiple uses, including medical uses such as diagnostic and surgical uses.
- At least one of the convex members comprises a truncated sphere. At least one of the convex members may comprise a frusto-sphere. At least one of the channels may open radially outward through a circumferential edge of the component.
- each of the convex and concave components comprises a central axial bore therethrough.
- at least one mating pair of convex and concave components has exactly 4 tension member channels running through each component, and/or at least one mating pair of convex and concave components has exactly 8 tension member channels running through each component.
- the channels in at least one concave component may be radially interconnected to form a cross-pattern.
- a spherical joint may be provided that comprises a ball member, a socket member and at least one tension member.
- the socket member may be configured to pivotably receive at least a portion of the ball member.
- the tension member(s) may extend through both the ball and socket members parallel to and offset from a central longitudinal axis of the joint.
- Exemplary embodiments of the tool 100 may also be useful in endoscopic procedures, particularly when, as in some embodiments, the tool has a flexible shaft. Still other embodiments may be used for percutaneous procedures, such as a catheter. Still other embodiments include devices that are directed toward natural orifice transluminal endoscopic surgery (“NOTES”). Embodiments of the invention may include a wide variety of tools, some with medical or diagnostic purposes, and others that are applied to other types of tasks where the articulational capabilities of the tool provide benefit.
- NOTES natural orifice transluminal endoscopic surgery
- Proximal articulation links 108 and 110 extend distally from handle 106
- distal articulation links 112 and 114 extend proximally from end effector 102
- Proximal link 108 is a spindle and is connected to and moves with handle 106
- distal link 112 is connected to and moves with end effector 102
- An elongated shaft 116 is disposed between the proximal links and the distal links; in some embodiments the shaft is rigid, in other embodiments the shaft may be flexible.
- the tension members may comprise cables that are capable of only transmitting tension between the links.
- the tension members may comprise Nitinol wires, rods or other elements capable of transmitting both tension and compression.
- a link may be alternately pushed and pulled by at least one tension member.
- one set of control cables, such as cables 120 may be eliminated to provide an instrument with a single pair of connected links. What is meant by the word “connected” is that the cable(s) are attached to a pair of links to allow one link to drive another link, as opposed to the cables merely slidably passing through the connected links.
- the end effector 102 is a pair of jaws. Actuation force is transmitted from end effector actuator 104 through a transmission that includes a linearly movable rod and a rotatable rod actuator (not shown). Other end effectors (surgical, diagnostic, etc.) and end effector actuators may be used with an articulating tool constructed according to this invention.
- the distal links themselves can comprise an end effector, such as, for example, a retractor.
- the movable rod may comprise any flexible material; in some embodiments Nitinol offers particular advantages as it is sufficiently flexible to accommodate articulation, and yet can still carry a compressive load sufficiently, for example, to be able to push open an end effector, such as a set of jaws.
- a series of proximal links themselves, can comprise a “handle” with no other rigid handle being provided.
- the proximal links may be formed into a particular shape which is emulated by a corresponding series of distal links. More details of such embodiments are provided in U.S. Pat. No. 7,090,637.
- FIG. 3 shows an exploded view of certain proximal components of the articulating tool.
- the tension members have been omitted for clarity.
- a double headed bushing 109 is disposed between links 108 and 110
- another bushing 111 is disposed between links 110 and a proximal end cap 300 .
- the interaction of bushings 109 and 111 with links 108 and 110 and with proximal end cap 300 is described in more detail in U.S. 2005/0273084, U.S. 2006/0111209, and U.S. 2006/0111210. If the tension bearing cables 118 and 120 were shown in FIG. 3 as they are in FIGS.
- device 100 shown in FIGS. 1-3 includes two pairs of links, each interconnected by its own set of tension members. Specifically, one pair is formed by proximal link 108 and distal link 112 which are interconnected by tension members 118 , and another pair is formed by proximal link 110 and distal link 114 which are interconnected by tension members 120 . In other embodiments, only a single pair of links interconnected by a single set of tension members is used. In yet other embodiments, three or more pairs of links may be used, each interconnected by a discrete set of tension members. In some embodiments, instead of a set of tension members, only a single tension member may be used between a pair of links, such as when the tension member is capable of also transmitting compression between the links.
- proximal link 110 and end cap 300 pivot relative to one another about two pivot points (i.e. about the centers of the two ball ends of bushing 111 ).
- links may pivot relative to one another about a single pivot point.
- protruding pin features are located on opposite sides of each ball and are pivotably received within mating slots located in the concave recesses. This pin and slot configuration allows torque to be transmitted across the four proximal spherical joints.
- Distal links 112 and 114 , and distal end cap 400 are separated by bushings in a similar arrangement.
- tension member channels 1806 , 1807 , 1820 , 1822 and 304 As can be seen by the radial location of tension member channels 1806 , 1807 , 1820 , 1822 and 304 relative to the concave recesses, the tension members travel axially along lines that are radially outside of the spherical joint surfaces in this embodiment.
- FIGS. 4A-4E show details of a combination link and bushing member 500 that may be used in any of the articulating devices described above.
- member 500 may be used to replace link 110 and bushing 111 shown in FIG. 3
- a component similar to member 500 may be used to replace link 108 and bushing 109 .
- FIGS. 5A-5B show two link and bushing members 500 , 500 axially coupled together in operation.
- the convex component 504 of the upper member 500 is received within the concave component 502 of the lower member 500 to form a spherical joint.
- the spherical joint is capable of pivoting in at least two degrees of freedom. Dimensions may be appropriately chosen such that the four convex spherical surfaces 518 slidably engage with the concave spherical surface 508 but lateral movement between the spherical surfaces is generally prevented.
- FIG. 6B is a cross-section similar to FIG. 5B , but is aligned with channels 514 in concave component 502 and channels 516 in convex component 504 .
- Tension members 522 such as for controlling other links in an articulating system, are shown passing through channels 514 and 516 .
- the tapering of channels 516 permit members 500 , 500 to pivot without tension members 522 binding.
- channels 516 may be tapered only at their lower ends and not at their upper ends.
- channels 514 in concave component 502 may be tapered while channels 516 in convex component 504 are straight.
- channels in both components 502 and 504 are tapered.
- channels in both components 502 and 504 are straight and sufficient axial distance between the channels is provided to inhibit binding of tension members 522 during pivoting movement.
- torque may be transmitted between members 500 , 500 by tension members 522 without the need for protrusions and slots as previously described in relation to FIG. 3 . It can be appreciated that the shorter the distance between channels 514 and 516 and the closer that these channels constrain tension members 522 , the less axial rotation or backlash there will be between members 500 , 500 for a given torque.
- Convex components 550 are constructed and operate in a manner similar to that of convex components 504 described above.
- each component 550 includes a portion having the overall shape of a frustro-sphere, as best seen in FIG. 8A .
- This frusto-sphere is circumferentially interrupted by four channels 516 that extend axially through the frusto-sphere, but also extend radially outward to divide the frustro-sphere into four convex spherical surfaces 518 .
- each channel 516 is outwardly tapered at both its top and bottom to generally form an hourglass shape.
- FIGS. 12A-12B and 13 A- 13 C show details of a concave link member 560 that may be used in the articulating devices described above.
- members 560 may be used in a similar manner to proximal links 108 and 110 shown in FIG. 3 , and/or in the distal articulating mechanism of a grasper instrument as shown in FIGS. 15 and 16 .
- the recess and spherical surface 508 located on the proximal end 572 of member 560 are configured to pivotably engage with the convex spherical surfaces 518 ′ formed on one end of a convex bushing component 550 ′ (shown in FIGS. 10A-10B and 11 A- 11 B).
- the recess and spherical surface 508 located on the distal end 574 of member 560 are configured to pivotably engage with the convex spherical surfaces 518 formed on one end of a convex bushing component 550 (shown in FIGS. 7-9 ).
- the recess located on the distal end 574 of member 560 is provided with two cross channels 576 that interconnect the distal ends of every other channel 570 .
- Surface friction (or in some embodiments, adhesive, solder, crimping, or the like) keeps tension members 522 from sliding in cross channels 576 .
- the four tension member portions that extend through the four channels 570 connected to cross channels 576 can be used to control the pivoting motion of concave link member 560 , while four other tension members 522 can pass through member 560 in the remaining four channels 570 to control another link located distal to member 560 , as will be more fully described below.
- Distal articulating mechanism 578 includes a double-ended convex bushing 556 , a concave link member 560 , and a double-ended convex bushing 556 ′′, all as previously described.
- a distal link 582 constructed in a similar manner to one half of concave link member 560 shown in FIGS. 14A-14C , may be formed on grasper housing 584 .
- a recess 586 constructed in a similar manner to the proximal end 572 of concave member 560 shown in FIGS. 12-13 , may be provided on the distal end of instrument shaft 588 .
- articulating mechanism 600 is able to transmit torque between the links 604 and bushings 608 through tension members 522 without the use of other torque transmitting features on the components.
- articulating joints may be configured such that torque is not readily transmitted between the components by tension members 522 , but other advantages are nonetheless conferred by locating the tension members through one or more mating spherical surfaces of the joints.
- tension member guide system may be used in tools that are absent various features that may be associated with some articulatable instruments, such as handles, rotatability features, and dedicated end effectors.
- some articulatable instruments such as handles, rotatability features, and dedicated end effectors.
- devices having such an articulation system may have utility in other non-medical contexts as well.
Abstract
An articulating mechanism is provided with at least one pair of spherical joints interconnected by a set of tension members. Each joint includes a ball member, a socket member configured to pivotably receive at least a portion of the ball member, and at least one tension member extending through both the ball and socket members parallel to and offset from a central longitudinal axis of the joint.
Description
- This invention relates to articulating mechanisms and applications thereof, including the remote guidance and manipulation of surgical or diagnostic tools.
- Surgical procedures such as endoscopy and laparoscopy typically employ instruments that are steered within or towards a target organ or tissue from a position outside the body. Examples of endoscopic procedures include sigmoidoscopy, colonoscopy, esophagogastroduodenoscopy, and bronchoscopy, as well as newer procedures in natural orifice transluminal endoscopic surgery (“NOTES”). Traditionally, the insertion tube of an endoscope is advanced by pushing it forward, and retracted by pulling it back. The tip of the tube may be directed by twisting and general up/down and left/right movements. Oftentimes, this limited range of motion makes it difficult to negotiate acute angles (e.g., in the rectosigmoid colon), creating patient discomfort and increasing the risk of trauma to surrounding tissues.
- Laparoscopy involves the placement of trocar ports according to anatomical landmarks. The number of ports usually varies with the intended procedure and number of instruments required to obtain satisfactory tissue mobilization and exposure of the operative field. Although there are many benefits of laparoscopic surgery, e.g., less postoperative pain, early mobilization, and decreased adhesion formation, it is often difficult to achieve optimal retraction of organs and maneuverability of conventional instruments through laparoscopic ports. In some cases, these deficiencies may lead to increased operative time or imprecise placement of components such as staples and sutures.
- Steerable catheters are also well known for both diagnostic and therapeutic applications. Similar to endoscopes, such catheters include tips that can be directed in generally limited ranges of motion to navigate a patient's vasculature. There have been many attempts to design endoscopes and catheters with improved steerability. For example, U.S. Pat. No. 3,557,780 to Sato; U.S. Pat. No. 5,271,381 to Ailinger et al.; U.S. Pat. No. 5,916,146 to Alotta et al.; U.S. Pat. No. 6,270,453 to Sakai, and U.S. Pat. No. 7,147,650 to Lee describe endoscopic instruments with one or more flexible portions that may be bent by actuation of a single set of wires. The wires are actuated from the proximal end of the instrument by rotating pinions (Sato), manipulating knobs (Ailinger et al.), a steerable arm (Alotta et al.), by a pulley mechanism (Sato), or by manipulation of complementary portions (Lee). U.S. Pat. No. 5,916,147 to Boury et al. discloses a steerable catheter having four wires that run within the catheter wall. Each wire terminates at a different part of the catheter. The proximal ends of the wires extend loosely from the catheter so that the physician may pull them. The physician is able to shape and thereby steer the catheter by selectively placing the wires under tension.
- Recently, surgical instruments, including minimally invasive surgical instruments, have been developed that are more ergonomic and which have a wider range of motion and more precise control of movement. These instruments may include mechanisms that articulate using a series of links coupled with one or more sets of tension bearing members, such as cables. As with conventional instruments used in minimally invasive surgery, rotation of the shaft and end effector with respect to the handle is also an important feature of cable and link type instruments to aid with dissecting, suturing, retracting, knot tying, etc. The links, joints, and other components of existing instrument articulation mechanisms include various undesirable limitations. With the increasing complexity associated with surgical procedures that these instruments are used to perform, further improvements in the design of the articulation mechanisms of the instruments are desirable.
- According to aspects of the invention, articulating tools are provided with improved articulating mechanisms as well as methods of assembling such tools. In some embodiments, the articulating tool is appropriate for multiple uses, including medical uses such as diagnostic and surgical uses.
- In some embodiments, an articulating mechanism comprises at least one pair of longitudinally spaced apart spherical joints. Each joint may include a convex component and a mating concave component. The concave component is configured to receive at least a portion of the convex component. Both components may have spherical surfaces adapted to slide relative to one another. The articulating mechanism further comprises at least one set of tension members interconnecting one component of one of the joints of a pair to one component of the other joint of the pair. With this arrangement, movement of one of the interconnected components causes corresponding relative movement of the other interconnected component directly through tension member movement. Each of the convex and concave components includes a plurality of channels. Each channel is sized to slidably receive one of the tension members. Each channel on at least one of the components has an opening located on the spherical surface of the component. The channels located in mating convex and concave components form pairs of opposing channels. At least one of these pairs of opposing channels cooperates with a common tension member received therein to transmit torque between the mating components.
- In some of the above embodiments, the articulating mechanism further comprises at least two pairs of longitudinally spaced apart spherical joints. Each of the pairs may have a discrete set of tension members associated with it. The mechanism may further comprise an intermediate member such that each pair of joints has one joint on one side of the member and one joint on the other side of the member. The intermediate member may comprise a rigid tube configured for receiving the tension members therethrough. The convex component of one of the joints may be integrally formed as a single part with the concave component of another of the joints. The convex component of one of the joints may be integrally formed as a single part with the convex component of another of the joints. The concave component of one of the joints may be integrally formed as a single part with the concave component of another of the joints.
- In some of the above embodiments, at least one of the convex members comprises a truncated sphere. At least one of the convex members may comprise a frusto-sphere. At least one of the channels may open radially outward through a circumferential edge of the component. In some embodiments, each of the convex and concave components comprises a central axial bore therethrough. In some embodiments, at least one mating pair of convex and concave components has exactly 4 tension member channels running through each component, and/or at least one mating pair of convex and concave components has exactly 8 tension member channels running through each component. The channels in at least one concave component may be radially interconnected to form a cross-pattern.
- According to aspects of the invention, a spherical joint may be provided that comprises a ball member, a socket member and at least one tension member. The socket member may be configured to pivotably receive at least a portion of the ball member. The tension member(s) may extend through both the ball and socket members parallel to and offset from a central longitudinal axis of the joint.
- In some embodiments, an articulating mechanism for remote manipulation of a surgical or diagnostic tool is provided. The tool may comprise multiple pairs of links. Each link of each pair may be maintained in a spaced apart relationship relative to the other link of the pair. The mechanism may further comprise multiple sets of tension members. Each set of tension members may connect the links of a discrete pair to one another, such that movement of one link of a pair causes corresponding relative movement of the other link of the pair. Each link may be part of a spherical joint having mating convex and concave surfaces. The tension members may extend through channels in the mating surfaces.
- In some of the above embodiments, the links form proximal and distal ends with links of corresponding pairs being located adjacent to the proximal and distal ends, respectively. In these embodiments, movement of the proximal end results in corresponding relative movement of the distal end. The articulating mechanism may further comprise a handle located at the proximal end and a grasper at the distal end.
- All publications and patent applications mentioned in this specification are herein incorporated by reference to the same extent as if each individual publication or patent application was specifically and individually indicated to be incorporated by reference.
- The novel features of the invention are set forth with particularity in the claims that follow. A better understanding of the features and advantages of the present invention will be obtained by reference to the following detailed description that sets forth illustrative embodiments, in which the principles of the invention are utilized, and the accompanying drawings which are briefly described below.
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FIG. 1A is an obliquely distal-looking perspective view of an exemplary articulating device having a handle and an end effector.FIG. 1B is a detailed view of the circled portion ofFIG. 1A , which includes proximal links and bushings. -
FIG. 2 shows the device ofFIG. 1 in a proximal-looking view, with the handle and end effector in an articulated position.FIG. 2B is a detailed view of the circled portion ofFIG. 2A , which includes distal links and bushings. -
FIG. 3 is an exploded perspective view of certain proximal components of the articulating device. -
FIGS. 4A , 4B, 4C, 4D, 4E, 5A, 5B and 6A, 6B show details of a combination link and busing member for use with the articulating device. -
FIGS. 7A , 7B and 8A, 8B, 8C, 8D, 8E show details of convex bushing components for use with the articulating device. -
FIG. 9 shows details of a double-ended convex bushing component formed as a single unitary piece. -
FIGS. 10A , 10B and 11A, 11B show details of another convex bushing component for use with the articulating device. -
FIGS. 12A , 12B, and 13A, 13B, 13C show details of a concave link member for use with an articulating device. -
FIG. 14A , 14B, 14C shows details of another concave link member for use with an articulating device. -
FIGS. 15-16 show details of an articulating mechanism located on the distal end of an instrument according to aspects of the invention. -
FIGS. 17A , 17B, 17C, 17D, 17E, 18A, 18B, 18C, 18D, 19A, 19B, 19C, and 20A, 20B show details of an alternative articulating mechanism. - Articulating tools are described in U.S. Pat. No. 7,090,637; US 2005/0107667; US 2005/0273084; US 2005/0273085; US 2006/0111209, US 2006/0111210, and US 2006/0111615. The articulating mechanisms of the tools described in those publications use multiple pairs of segments or links controlled, e.g., by multiple sets of cables, as well as tools that have a single pair of links, connected by a single set of cables, such as those described in U.S. Pat. No. 5,916,146. Depending upon the specific design of the device, the links can be discrete segments (as described, e.g., in U.S. Pat. No. 7,090,637) or discrete portions of a flexible segment (as described, e.g., in US 2005/0273085). The instrument may also include steerable or controllable links, e.g., as described in US 2005/0273084, US 2006/0111209 and US 2006/0111210. The devices of this invention may include optional end effectors at their distal ends and end effector actuators supported by a handle at their proximal ends. When using such articulating instruments, a user may manipulate the proximal end of the instrument, thereby moving one or more distal links of the articulation mechanism. Aspects of the present invention may be used in any of these and in other articulating mechanisms.
-
FIGS. 1A and 2A show anexemplary articulatable tool 100 with anend effector 102 at its distal end and anend effector actuator 104 within ahandle 106 at its proximal end:FIG. 1A shows the tool in a neutral or non-articulated configuration, whileFIG. 2A shows the tool in an articulated position or configuration.FIG. 1B shows detail (encircled inFIG. 1A ) of the proximal links of the tool.FIG. 2B shows detail (encircled inFIG. 2A ) of the distal links of the tool.Instrument 100 may be used, e.g., in a laparoscopic procedure requiring grasping or cutting within a patient. Exemplary embodiments of thetool 100 may also be useful in endoscopic procedures, particularly when, as in some embodiments, the tool has a flexible shaft. Still other embodiments may be used for percutaneous procedures, such as a catheter. Still other embodiments include devices that are directed toward natural orifice transluminal endoscopic surgery (“NOTES”). Embodiments of the invention may include a wide variety of tools, some with medical or diagnostic purposes, and others that are applied to other types of tasks where the articulational capabilities of the tool provide benefit. - Proximal articulation links 108 and 110 extend distally from
handle 106, and distal articulation links 112 and 114 extend proximally fromend effector 102.Proximal link 108 is a spindle and is connected to and moves withhandle 106. Likewise,distal link 112 is connected to and moves withend effector 102. Anelongated shaft 116 is disposed between the proximal links and the distal links; in some embodiments the shaft is rigid, in other embodiments the shaft may be flexible. - A set of tension bearing elements or
control cables 118 is attached toproximal link 108, extends throughproximal link 110,shaft 116 anddistal link 114 and is attached todistal link 112, as shown inFIGS. 1A and 1B . A second set of tension bearing element orcontrol cables 120 is attached toproximal link 110, extends throughshaft 116 and is attached todistal link 114. In this embodiment, there are threecontrol cables 118 in the first set and threecontrol cables 120 in the second set. It should be appreciated, however, that other numbers of control cables may be used to connect corresponding proximal and distal links. In addition, tension bearing elements other than cables may be used to connect corresponding links. In some embodiments, the tension members may comprise cables that are capable of only transmitting tension between the links. In other embodiments, the tension members may comprise Nitinol wires, rods or other elements capable of transmitting both tension and compression. In these latter embodiments, a link may be alternately pushed and pulled by at least one tension member. In some embodiments, one set of control cables, such ascables 120, may be eliminated to provide an instrument with a single pair of connected links. What is meant by the word “connected” is that the cable(s) are attached to a pair of links to allow one link to drive another link, as opposed to the cables merely slidably passing through the connected links. - As shown in
FIGS. 1A , 1B, 2A, and 2B, movement ofhandle 106 andproximal link 108 with respect toproximal link 110 movesend effector 102 anddistal link 112 in a relative and corresponding manner. Likewise, movement ofproximal link 110 with respect toshaft 116 movesdistal link 114 with respect toshaft 116 in a relative and corresponding manner, also as shown inFIG. 2 . This relative articulation movement provides a way for a user to remotely manipulate the end effector through movement of the handle. It should be understood that the proximal and distal links can be connected by the tension bearing elements so as to move in the same direction with respect to the shaft (thereby providing a mirror image movement) or in opposite directions with respect to the shaft, depending on whether the tension bearing elements connect the corresponding links on the opposite sides or on the same sides of the links, respectively. In addition, the degree of relative movement can be determined by the relative diameters of the cables' connections to corresponding links as well as through the use and specific design of bushings or spacer links separating the connected proximal and distal links. For example, in the embodiment shown inFIGS. 1-3 , the cables' radial spacing on the proximal links is about three times greater than their radial spacing on the distal links. This means that a movement of about 5° in a proximal link will cause a corresponding movement of about 15° in a distal link. Further details of these links are provided in US2005/0273085, which is hereby incorporated by this reference. - In the embodiment illustrated in
FIG. 1 , theend effector 102 is a pair of jaws. Actuation force is transmitted fromend effector actuator 104 through a transmission that includes a linearly movable rod and a rotatable rod actuator (not shown). Other end effectors (surgical, diagnostic, etc.) and end effector actuators may be used with an articulating tool constructed according to this invention. In some embodiments, the distal links themselves can comprise an end effector, such as, for example, a retractor. The movable rod may comprise any flexible material; in some embodiments Nitinol offers particular advantages as it is sufficiently flexible to accommodate articulation, and yet can still carry a compressive load sufficiently, for example, to be able to push open an end effector, such as a set of jaws. In some embodiments, a series of proximal links, themselves, can comprise a “handle” with no other rigid handle being provided. In other words, the proximal links may be formed into a particular shape which is emulated by a corresponding series of distal links. More details of such embodiments are provided in U.S. Pat. No. 7,090,637. -
FIG. 3 shows an exploded view of certain proximal components of the articulating tool. The tension members have been omitted for clarity. As shown, a double headedbushing 109 is disposed betweenlinks bushing 111 is disposed betweenlinks 110 and aproximal end cap 300. The interaction ofbushings links proximal end cap 300 is described in more detail in U.S. 2005/0273084, U.S. 2006/0111209, and U.S. 2006/0111210. If thetension bearing cables FIG. 3 as they are inFIGS. 1 and 2 , the proximal ends of the threecables 118 would terminate inopenings 1806 oflink 108, and the cables would pass throughopenings 1820 inlink 110 andopenings 304 inend cap 300 before enteringshaft 116. Likewise, the proximal ends of threecables 120 would terminate inopenings 1822 oflink 110 and would pass throughopenings 304 inproximal end cap 300 before enteringshaft 116. A tapered end cap housing or cover 306 may be rigidly fixed toshaft 116 to provide a transition fromend cap 300 toshaft 116. - As previously noted,
device 100 shown inFIGS. 1-3 includes two pairs of links, each interconnected by its own set of tension members. Specifically, one pair is formed byproximal link 108 anddistal link 112 which are interconnected bytension members 118, and another pair is formed byproximal link 110 anddistal link 114 which are interconnected bytension members 120. In other embodiments, only a single pair of links interconnected by a single set of tension members is used. In yet other embodiments, three or more pairs of links may be used, each interconnected by a discrete set of tension members. In some embodiments, instead of a set of tension members, only a single tension member may be used between a pair of links, such as when the tension member is capable of also transmitting compression between the links. - As shown in
FIG. 3 ,proximal links proximal link 110 is separated fromproximal end cap 300 bybushing 111.Proximal bushings proximal links proximal end cap 300 for receiving a portion of the ball ends of the bushings. With this arrangement,proximal links proximal link 110 andend cap 300 pivot relative to one another about two pivot points (i.e. about the centers of the two ball ends of bushing 111). In other embodiments, some of which are later described, links may pivot relative to one another about a single pivot point. In the embodiment shown inFIG. 3 , protruding pin features are located on opposite sides of each ball and are pivotably received within mating slots located in the concave recesses. This pin and slot configuration allows torque to be transmitted across the four proximal spherical joints.Distal links distal end cap 400 are separated by bushings in a similar arrangement. As can be seen by the radial location oftension member channels -
FIGS. 4A-4E show details of a combination link andbushing member 500 that may be used in any of the articulating devices described above. For example,member 500 may be used to replacelink 110 andbushing 111 shown inFIG. 3 , and a component similar tomember 500 may be used to replacelink 108 andbushing 109. - Link and
bushing member 500 comprises aconcave component 502 and a complementary-shapedconvex component 504, which may be integrally formed therewith as shown. A centralaxial bore 506 may be provided throughmember 500.Concave component 502 includes a recess having a concavespherical surface 508. In this embodiment,spherical surface 508 is bounded above byrim surface 510 and below bystop surface 512, which is further described below. Concavespherical surface 508 is interrupted by the upper openings of fourchannels 514 that travel axially through the concave component and in this embodiment are evenly spaced around the centralaxial bore 506. - The convex component of
member 500 includes a portion having the overall shape of a frustro-sphere, as best seen inFIG. 4D . This frusto-sphere is circumferentially interrupted by fourchannels 516 that extend axially in line withchannels 514, but also extend radially outward to divide the frustro-sphere into four convexspherical surfaces 518. As best seen inFIG. 4D , eachchannel 516 is outwardly tapered at both its top and bottom to generally form an hourglass shape. -
FIGS. 5A-5B show two link andbushing members FIG. 5B , theconvex component 504 of theupper member 500 is received within theconcave component 502 of thelower member 500 to form a spherical joint. In this embodiment, the spherical joint is capable of pivoting in at least two degrees of freedom. Dimensions may be appropriately chosen such that the four convexspherical surfaces 518 slidably engage with the concavespherical surface 508 but lateral movement between the spherical surfaces is generally prevented. Stopsurface 512 may be provided in the lower concave component for abutting against thebottom surface 520 of the upper convex component to limit the degree of angular rotation permitted between the twomembers stop surface 520 is symmetrical about the central longitudinal axis, and in other embodiments it is asymmetrical. As shown, each centralaxial bore 506 may be tapered at its top and bottom such that any cables, tubes, fiber optics, etc. passing through the bore are not pinched and do not inhibitmembers -
FIG. 6B is a cross-section similar toFIG. 5B , but is aligned withchannels 514 inconcave component 502 andchannels 516 inconvex component 504.Tension members 522, such as for controlling other links in an articulating system, are shown passing throughchannels channels 516permit members tension members 522 binding. In some embodiments of the invention,channels 516 may be tapered only at their lower ends and not at their upper ends. In other embodiments,channels 514 inconcave component 502 may be tapered whilechannels 516 inconvex component 504 are straight. In yet other embodiments, channels in bothcomponents components tension members 522 during pivoting movement. - With the arrangement shown in
FIG. 6B , torque may be transmitted betweenmembers tension members 522 without the need for protrusions and slots as previously described in relation toFIG. 3 . It can be appreciated that the shorter the distance betweenchannels tension members 522, the less axial rotation or backlash there will be betweenmembers - Spherical joints constructed as described above may be provided with mating spherical surfaces that are larger than those of conventional spherical joints for a given joint envelope because they are not outwardly constrained by ball protrusions, socket slots, or tension members that are located radially outward from the mating spherical surfaces. Larger surface sizes may provide additional benefits such as being able to carry more load, allow for looser tolerance control and/or greater instrument rigidity. Such an arrangement may also allow one or more components of the joint to be made out of lighter, cheaper or disposable material such as plastic.
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FIGS. 7A-7B and 8A-8E show details ofconvex bushing components 550 that may be used in any of the articulating devices described above. For example,components 550 may be used in pairs in a similar manner toproximal bushings FIG. 3 , and/or in the distal articulating mechanism of a grasper instrument as shown inFIG. 16 . -
Convex components 550 are constructed and operate in a manner similar to that ofconvex components 504 described above. In particular, eachcomponent 550 includes a portion having the overall shape of a frustro-sphere, as best seen inFIG. 8A . This frusto-sphere is circumferentially interrupted by fourchannels 516 that extend axially through the frusto-sphere, but also extend radially outward to divide the frustro-sphere into four convexspherical surfaces 518. As best seen inFIG. 8A , eachchannel 516 is outwardly tapered at both its top and bottom to generally form an hourglass shape. - Each
convex component 550 comprises a pair of opposing, axially protrudingring segments 552 on opposite sides of acentral bore 554, as best seen inFIG. 7A where twocomponents 550 are shown axially separated. The protrudingring segments 552 of two facingcomponents 550 may be rotationally oriented as shown inFIG. 7A so that when they are axially drawn together, as shown inFIG. 7B , the four protrudingring segments 552 interdigitate and rotationally lock the twocomponents 550 together. This creates a double-endedbushing 556, with each end having a convex component formed by fourspherical surfaces 518. Forming the double-endedbushing 556 from two separate pieces as shown facilitates fabrication of the bushing from an injection molding process. As shown inFIG. 9 , a similar double-endedbushing 556′ may also be formed as a single, unitary piece. -
FIGS. 10A-10B and 11A-11B show details ofconvex bushing components 550′.Convex components 550′ are similar toconvex components 550 described above and shown inFIGS. 7A-7B and 8A-8E, except thatcomponents 550′ each have eightchannels 516 instead of fourchannels 516. This allows up to eight tension members 522 (shown inFIG. 6B ) to pass throughcomponents 550′. When twoconvex bushing components 550′ are interengaged as shown inFIG. 10B , they form a double-endedbushing 556″, with each end having a convex component formed by eightspherical surfaces 518′. A similar double-ended bushing (not shown) may also be formed as a single, unitary piece. -
FIGS. 12A-12B and 13A-13C show details of aconcave link member 560 that may be used in the articulating devices described above. For example,members 560 may be used in a similar manner toproximal links FIG. 3 , and/or in the distal articulating mechanism of a grasper instrument as shown inFIGS. 15 and 16 . -
Concave member 560 is constructed and operates in a manner similar to that ofconcave component 502 described above. In particular, a centralaxial bore 506 may be provided throughmember 560. A recess having a concavespherical surface 508 is provided at each end ofconcave member 560. In this embodiment, eachspherical surface 508 is bounded on the outside by acastellated rim surface stop surface tension members 522 when the device is articulated. Stop surfaces 566 and 568 function in a manner similar to previously describedstop surface 512. Each concavespherical surface 508 is interrupted by the openings of eightchannels 570 that travel axially throughconcave member 560 and in this embodiment are evenly spaced around the centralaxial bore 506. - The recess and
spherical surface 508 located on theproximal end 572 of member 560 (as shown inFIGS. 12A and 13A ) are configured to pivotably engage with the convexspherical surfaces 518′ formed on one end of aconvex bushing component 550′ (shown inFIGS. 10A-10B and 11A-11B). Similarly, the recess andspherical surface 508 located on thedistal end 574 of member 560 (as shown inFIGS. 12B and 13C ) are configured to pivotably engage with the convexspherical surfaces 518 formed on one end of a convex bushing component 550 (shown inFIGS. 7-9 ). - As shown in
FIG. 13C , the recess located on thedistal end 574 ofmember 560 is provided with twocross channels 576 that interconnect the distal ends of everyother channel 570. This allows a tension member 522 (not shown inFIG. 13 ) to pass through onechannel 570 from theproximal end 572 to thedistal end 574 ofmember 560, cross over to anotherchannel 570, and return to theproximal end 572 through theother channel 570. Surface friction (or in some embodiments, adhesive, solder, crimping, or the like) keepstension members 522 from sliding incross channels 576. In this manner, the four tension member portions that extend through the fourchannels 570 connected to crosschannels 576 can be used to control the pivoting motion ofconcave link member 560, while fourother tension members 522 can pass throughmember 560 in the remaining fourchannels 570 to control another link located distal tomember 560, as will be more fully described below. -
FIGS. 14A-14C show details of aconcave link member 560′.Member 560′ is similar in construction and operation to that ofmember 560, exceptmember 560′ has only fouraxial channels 570 through it instead of eight. -
FIGS. 15 and 16 show details of the distal end of an articulating instrument, similar toinstrument 100 shown inFIGS. 1-3 and having a distal articulatingmechanism 578 similar to the articulating mechanism shown inFIG. 2B . The distal end of the instrument includes a pair ofgraspers 580 that may be operated by an actuator (not shown) located at the proximal end of the instrument. - Distal articulating
mechanism 578 includes a double-endedconvex bushing 556, aconcave link member 560, and a double-endedconvex bushing 556″, all as previously described. Adistal link 582, constructed in a similar manner to one half ofconcave link member 560 shown inFIGS. 14A-14C , may be formed ongrasper housing 584. Similarly, arecess 586, constructed in a similar manner to theproximal end 572 ofconcave member 560 shown inFIGS. 12-13 , may be provided on the distal end ofinstrument shaft 588. With this arrangement, concavedistal link 582 may pivot relative toconcave link member 560 about the centers of the two spherical ends of double-endedconvex bushing 556. Similarly,concave link member 560 may pivot relative to recess 586 about the centers of the two spherical ends of double-endedconvex bushing 556″. - An articulating mechanism similar to distal articulating
mechanism 578 may be used at the proximal end of the instrument, although its relative size may be larger or smaller to provide scaling of movement. In this exemplary embodiment, one set of fourtension members 522 interconnects the innermost links (i.e.distal link 560 and the proximal link (not shown inFIG. 15 or 16) closest to shaft 588). A separate set of fourmore tension members 522 interconnects the outermost links (i.e.distal link 582 and the proximal link (not shown inFIG. 15 or 16) farthest from shaft 588). With this arrangement, movement of the instrument handle (not shown) causes movement of the two proximal links which in turn drive corresponding movement of their respectivedistal links tension members 522. -
FIGS. 17-20 show details of an alternative embodiment of articulatingmechanism 600. The construction and operation ofmechanism 600 is similar to previously described articulatingmechanism 578, but the convex and concave portions have been reversed. In other words, theconvex components 602 are located on thelinks 604, and theconcave components 606 are located on thebushings 608. As previously described, each of the components may be provided with a centralaxial bore axial channels 614 inlinks 604 andaxial channels 616 inbushing 608 for receivingtension members 522 may be tapered at one or both ends. As best seen inFIGS. 18A and 18B, thetension member channels 616 inbushing 608 may be elongated such that they form a single cross-shaped opening withcentral bore 612. - As with the previous embodiments described, articulating
mechanism 600 is able to transmit torque between thelinks 604 andbushings 608 throughtension members 522 without the use of other torque transmitting features on the components. In other embodiments (not shown), articulating joints may be configured such that torque is not readily transmitted between the components bytension members 522, but other advantages are nonetheless conferred by locating the tension members through one or more mating spherical surfaces of the joints. - While the inventive surgical instruments and devices with improved articulating mechanisms have been described in some detail by way of illustration, such illustration is for purposes of clarity of understanding only. It will be readily apparent to those of ordinary skill and in the art in light of the teachings herein that certain changes and modifications may be made thereto without departing from the spirit and scope of the appended claims. For example, while the tool embodiments described in here have typically been in the context of tools with an articulating mechanism comprising at least two links, the tension member guide system may be used in an instrument comprising only a single link, a multiplicity of links, and with any number of tension members such as cables, or numbers of cable sets operably connecting the links. Further, the tension member guide system may be used in tools that are absent various features that may be associated with some articulatable instruments, such as handles, rotatability features, and dedicated end effectors. Finally, while the context of the invention may be considered to be surgical or medical diagnostic procedures, devices having such an articulation system may have utility in other non-medical contexts as well.
Claims (18)
1. An articulating mechanism comprising:
at least one pair of longitudinally spaced apart spherical joints, each joint comprising a convex component and a mating concave component configured to receive at least a portion of the convex component, both components having spherical surfaces adapted to slide relative to one another; and
at least one set of tension members interconnecting one component of one of the joints of a pair to one component of the other joint of the pair such that movement of one of the interconnected components causes corresponding relative movement of the other interconnected component directly through tension member movement, wherein each of the convex and concave components includes a plurality of channels, each channel sized to receive one of the tension members and the channels in at least one of the components having an opening located on the spherical surface of the component, wherein the channels located in mating convex and concave components form pairs of opposing channels, at least one of the pairs of opposing channels cooperating with a common tension member received therein to transmit torque between the mating components.
2. The articulating mechanism of claim 1 further comprising at least two of the pairs of longitudinally spaced apart spherical joints, each of the pairs having a discrete set of tension members associated with it.
3. The articulating mechanism of claim 2 further comprising an intermediate member such that each pair of joints has one joint on one side of the member and one joint on the other side of the member.
4. The articulating mechanism of claim 3 wherein the intermediate member comprises a rigid tube configured for receiving the tension members therethrough.
5. The articulating mechanism of claim 2 wherein the convex component of one of the joints is integrally formed as a single part with the concave component of another of the joints.
6. The articulating mechanism of claim 2 wherein the convex component of one of the joints is integrally formed as a single part with the convex component of another of the joints.
7. The articulating mechanism of claim 2 wherein the concave component of one of the joints is integrally formed as a single part with the concave component of another of the joints.
8. The articulating mechanism of claim 1 wherein at least one of the convex members comprises a truncated sphere.
9. The articulating mechanism of claim 1 wherein at least one of the convex members comprises a frusto-sphere.
10. The articulating mechanism of claim 1 wherein at least one of the channels opens radially outward through a circumferential edge of the component.
11. The articulating mechanism of claim 1 wherein each of the convex and concave components comprises a central axial bore therethrough.
12. The articulating mechanism of claim 1 wherein at least one mating pair of convex and concave components has exactly 4 tension member channels running through each component.
13. The articulating mechanism of claim 1 wherein at least one mating pair of convex and concave components has exactly 8 tension member channels running through each component.
14. The articulating mechanism of claim 1 wherein the channels in at least one concave component are radially interconnected to form a cross-pattern.
15. A spherical joint comprising:
a ball member;
a socket member configured to pivotably receive at least a portion of the ball member; and
at least one tension member extending through both the ball and socket members parallel to and offset from a central longitudinal axis of the joint.
16. An articulating mechanism for remote manipulation of a surgical or diagnostic tool comprising: multiple pairs of links, each link of each pair being maintained in a spaced apart relationship relative to the other link of the pair, and multiple sets of tension members, with each set connecting the links of a discrete pair to one another, such that movement of one link of a pair causes corresponding relative movement of the other link of the pair, wherein each link is part of a spherical joint having mating convex and concave surfaces, and wherein the tension members extend through channels in the mating surfaces.
17. The articulating mechanism of claim 16 wherein the links form proximal and distal ends with links of corresponding pairs being located adjacent to the proximal and distal ends respectively and where movement of the proximal end results in corresponding relative movement of the distal end.
18. The articulating mechanism of claim 17 further comprising a handle located at the proximal end and a grasper at the distal end.
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US20130239734A1 (en) | 2013-09-19 |
US9221179B2 (en) | 2015-12-29 |
WO2011011473A1 (en) | 2011-01-27 |
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