MICROSURGICAL TOOL FOR ROBOTIC APPLICATIONS

• US 20170165011A1
• Filed: 02/17/2017
• Published: 06/15/2017
• Est. Priority Date: 04/01/2015
• Status: Active Grant

• Current Assignee: Auris Health, Inc. (Johnson & Johnson)
• Original Assignee: Auris Surgical Robotics, Inc. (Johnson & Johnson)
• Inventors: BOVAY, Loic Alexandre, SCHUH, Travis, REYES, Fernando, JIANG, Allen
• Granted Patent: US 10,639,109 B2
• Time in Patent Office: Days
• CPC Class Codes: A61B 17/2804 with two or more pivotal connections A61B17/29 takes precedence
• CPC Class Codes: A61B 17/2909 Handles
• CPC Class Codes: A61B 2017/2912 transmission of forces to actuating rod or piston
• CPC Class Codes: A61B 2017/2927 the angular position of the head being adjustable with respect to the shaft
• CPC Class Codes: A61B 2017/2929 with a head rotatable about the longitudinal axis of the shaft
• CPC Class Codes: A61B 2017/2932 Transmission of forces to jaw members
• CPC Class Codes: A61B 2034/304 including a freely orientable platform, e.g. so called 'Stewart platforms'
• CPC Class Codes: A61B 2034/305 Details of wrist mechanisms at distal ends of robotic arms
• CPC Class Codes: A61B 34/30 Surgical robots
• CPC Class Codes: A61B 34/71 Manipulators operated by drive cable mechanisms
• CPC Class Codes: A61B 34/72 Micromanipulators

Abstract

The disclosed technology includes improved microsurgical tools providing multiple degrees of freedom at the wrist level, including roll, pitch, and grasp DOFs, a tight articulation bending radius, low radial offset, and improved stiffness. Some implementations include an end effector platform moveable along a fixed trajectory on a fictional axle so as not to interfere with a central-axis aligned working channel; a crossed-arm mechanical linkage for articulating an end-effector platform throughout a pitch DOF with an amplified pitch angle; and a partial pulley system to articulate the arms while maximizing pulley radius to shaft diameter, and permitting a constant transmission efficiency to the arms throughout the range of articulation. In some implementations, a tool shaft outer diameter may be smaller than 3 mm; a pitch DOF range may be ±90°, a roll DOF range may be ±180°, and a grasp DOF range may be 30°.

Claims

1. A microsurgical tool, comprising:

an elongated body having a distal end;

a platform moveably coupled to the distal end of the elongated body; and

a linkage coupling the distal end of the elongated body to the platform to allow the platform to move relative thereto, wherein the linkage comprises;

a first arm operatively coupled to the distal end of the elongated body at a first proximal hinge and to the platform at a first distal hinge, the first arm having a first redirect surface, and

a first force transfer element disposed around the first redirect surface before coupling to the first arm such that pulling the first force transfer element pivots the first arm about the first proximal hinge with a first amplified range of motion.

2. The microsurgical tool of claim 1, wherein the linkage further comprises:

a second arm operatively coupled to the distal end of the elongated body at a second proximal hinge and to the platform at a second distal hinge, the second arm having a second redirect surface, and

a second force transfer element disposed around the second redirect surface before coupling to the second arm such that pulling the second force transfer element pivots the second arm about the second proximal hinge with a second amplified range of motion.

3. The microsurgical tool of claim 2, wherein the first and second arms are crossed with respect to one another.

4. The microsurgical tool of claim 2, wherein the first and second arms form a mechanical linkage for moving the first arm with a constant transmission efficiency between the mechanical linkage and the first arm throughout a range of movement of the first arm.

5. The microsurgical tool of claim 2, wherein the first and second amplified ranges of motion are of the same magnitude in opposite directions.

6. The microsurgical tool of claim 2, wherein the first proximal hinge and the second proximal hinge are co-axial.

7. The microsurgical tool of claim 2, wherein the first distal hinge and the second distal hinge are coupled to diametrically opposite positions on the platform.

8. The microsurgical tool of claim 1, wherein the first force transfer element comprises a pull wire.

9. The microsurgical tool of claim 1, wherein the first force transfer element and the first redirect surface of the first arm form a partial pulley to provide the first amplified range of motion.

10. The microsurgical tool of claim 1, wherein the first amplified range of motion is in a pitch degree of freedom.

11. The microsurgical tool of claim 1, wherein the first redirect surface of the first arm comprises a first semicircular portion.

12. The microsurgical tool of claim 11, wherein the first semicircular portion is concentric with the first proximal hinge.

13. The microsurgical tool of claim 1, wherein the first force transfer element is coupled to a first bore of the first arm, wherein the first bore is offset from a first line formed between the first proximal hinge and the first distal hinge.

14. The microsurgical tool of claim 1, further comprising an end effector operatively coupled to the platform.

15. The microsurgical tool of claim 14, wherein the end effector comprises a grasper.

16. The microsurgical tool of claim 14, wherein the end effector comprises at least one jaw, and further comprising a first tendon coupled to the at least one jaw and tensionable to move the at least one jaw, providing the at least one jaw with a grasping degree of freedom.

17. The microsurgical tool of claim 16, wherein the tendon is disposed at least partially within the elongated body.

18. The microsurgical tool of claim 14, further comprising a torque coil operatively coupled to the end effector to provide the end effector with a roll degree of freedom.

19. The microsurgical tool of claim 18, wherein one or more of the elongated body and the platform comprise a channel through which the torque coil is disposed.

20. The microsurgical tool of claim 1, wherein the elongated body has a centerline, and wherein the first proximal hinge is offset from the centerline.