Flexible wrist-type element and methods of manufacture and use thereof

• US 8,398,619 B2
• Filed: 06/29/2009
• Issued: 03/19/2013
• Est. Priority Date: 06/27/2008
• Status: Active Grant

• Current Assignee: Steris Corporation
• Original Assignee: Carefusion 2200 Corporation (Becton, Dickinson & Co)
• Inventors: Doyle, Mark, Koenig, Donald H.
• Primary Examiner(s): Farah, Ahmed M
• Assistant Examiner(s): LIPITZ, JEFFREY BRIAN
• Application Number:
  US12/493,967
• Publication Number:
  US 20090320637A1
• Time in Patent Office: 1,359 Days
• Field of Search: 606/1, 606/130
• US Class Current: 606/1
• CPC Class Codes: A61B 18/1445 at the distal end of a shaft, e.g. forceps or scissors at the end of a rigid rod
• CPC Class Codes: A61B 2017/00539 hydraulically
• CPC Class Codes: A61B 2017/00544 pneumatically
• CPC Class Codes: A61B 2017/2936 Pins in guiding slots
• CPC Class Codes: A61B 34/70 Manipulators specially adapted for use in surgery
• CPC Class Codes: Y10T 74/20317 including electric motor
• CPC Class Codes: Y10T 74/20335 Wrist

Abstract

A flexible wrist-type element and methods of operation thereof, including variations having an angularly moveable hub housing a rotatable and operable end effector driven via a drive train having one or more universal-type joints and/or other flexible couplings moveable via an input mechanism within a housing.

Claims

1. A flexible wrist-type element, comprising:

a body housing extending along a first longitudinal axis;

a hub at least partially extending along a second longitudinal axis and movably connected to the body housing, wherein the hub comprises a first end movable to a first position defining a first angle between the second longitudinal axis and the first longitudinal axis of the body housing, wherein the first angle is variable;

a plurality of couplings comprising a plurality of elements movably interconnected by a plurality of joints, wherein the plurality of couplings are movably positionable relative to the body housing and the hub, wherein the plurality of couplings have an input end adjacent to the body housing and an opposing output end adjacent to the first end of the hub, wherein the input end is configured to receive an input force comprising at least one of an axial force or a torsional force, and wherein the plurality of couplings are configured to transmit at least a portion of the input force from the input end to the output end when the first end of the hub is in the first position defining the first angle;

wherein the body housing comprises an extension adjacent to the hub, wherein the extension comprises an inner wall defining a surface, wherein at least one of the plurality of couplings are in movable contact with the surface, wherein the surface defines limits for movement of the plurality of couplings relative to the body housing and the hub; and

wherein the extension extends along a third longitudinal axis, and wherein the surface defines a slot having a first length substantially parallel to the third longitudinal axis and a second length substantially perpendicular to the third longitudinal axis, wherein the first length is greater than the second length.

2. The flexible wrist-type element of claim 1, further comprising a guide element movably connected to the body housing and the hub, wherein the guide element is further movably connected to the plurality of couplings and further comprises a surface, where the surface defines limits for movement of the plurality of couplings.

3. The flexible wrist-type element of claim 2, wherein the guide element is movable to a second angle relative to the body housing when the first end of the hub is in the first position defining the first angle relative to the body housing, wherein the second angle is less than the first angle.

4. The flexible wrist-type element of claim 3, wherein the guide element comprises opposing ends, wherein the first guide end is rotatably connected to a first one of the body housing or the hub adjacent to a first one of the opposing ends, and wherein the guide element is slidably connected to a second one of the body housing or the hub adjacent to a second one of the opposing ends.

5. The flexible wrist-type element of claim 1, further comprising a guide housing movably connected to the body housing and the hub, wherein the guide housing is further movably connected to at least one of the plurality of couplings and comprises a support surface supporting the at least one of the plurality of couplings during movement of the first end of the hub to the first position defining the first angle.

6. The flexible wrist-type element of claim 5, wherein the support surface limits an amount of pivoting between the plurality of couplings.

7. The flexible wrist-type element of claim 5, wherein the support surface prevents portions of the plurality of couplings from collapsing under compression and maintains alignment of the plurality of couplings under extension.

8. The flexible wrist-type element of claim 5, wherein the body housing comprises an extension adjacent to the hub, wherein the extension comprises an inner wall defining a first slot, wherein the guide housing further comprises a support element, and further comprising a guide element having a first guide end, a second guide end and a second slot, wherein the first guide end is movably connected to the body housing within the first slot, wherein the second guide end is movably connected to the hub, and wherein the support element of the guide housing is movably connected within the second slot of the guide element such that the second slot defines a limit for movement of the plurality of couplings.

9. The flexible wrist-type element of claim 8, wherein the first slot defines an angular limit of the first angle, and wherein the second slot defines an axial limit of movement of the plurality of couplings in response to the input force comprising the axial force.

10. The flexible wrist-type element of claim 5, wherein the guide housing is connected to the at least one of the plurality of couplings at one of the plurality of joints.

11. The flexible wrist-type element of claim 5, further comprising a bearing element positioned between the support surface and the at least one of the plurality of couplings, wherein the bearing element allows the at least one of the plurality of couplings to rotate relative to the guide housing.

12. The flexible wrist-type element of claim 1, wherein each of the plurality of joints comprises a universal joint or a Hooke'"'"'s joint.

13. The flexible wrist-type element of claim 1, wherein each of the plurality of joints comprises a first pair of ball bearings, spaced apart along a first axis, supporting a first one of the plurality of elements and a second pair of ball bearings, spaced apart along a second axis, supporting a second one of the plurality of elements, wherein the first axis is substantially perpendicular to the second axis.

14. The flexible wrist-type element of claim 1, wherein each of the plurality of joints comprises a constant-velocity joint.

15. The flexible wrist-type element of claim 1, wherein each of the plurality of elements comprises a first rigid end having a first engagement surface and a second rigid end having a second engagement surface, wherein each of the plurality of joints is defined by a movable interaction between the first engagement surface of a respective first element and the second engagement surface of a respective second element, wherein one of the first engagement surface and the second engagement surface comprises a curved surface.

16. The flexible wrist-type element of claim 15, wherein each of the plurality of elements further comprises a shaft portion connecting the first rigid end and the second rigid end, further comprising a guide housing having an extending support element and a connection with the shaft that allows relative rotation and prevents relative axial movement, and further comprising a guide element movably connected to the body housing and the hub, wherein the guide element comprises a surface movably connected to the support element of the guide housing, wherein the surface defines limits for movement of the plurality of couplings.

17. The flexible wrist-type element of claim 1, wherein the plurality of joints comprise at least three joints.

18. The flexible wrist-type element of claim 1, further comprising a drive system having an input mechanism coupled to the input end of the plurality of couplings, wherein the drive system generates the input force.

19. The flexible wrist-type element of claim 18, wherein the drive system further generates another force to move the first end of the hub to the first position defining the first angle.

20. The flexible wrist-type element of claim 18, wherein the drive system further comprises at least one of an electric system, a hydraulic system, a magnetic system, or a mechanical system.

21. The flexible wrist-type element of claim 1, further comprising a drive system having an input mechanism coupled to the input end of the plurality of couplings, wherein the drive system comprises a manually-driven hydraulic system.

22. The flexible wrist-type element of claim 1, further comprising an end effector coupled to the output end of the plurality of couplings, wherein the end effector moves in response to receiving at least the portion of the input force transmitted by the plurality of couplings.

23. The flexible wrist-type element of claim 22, wherein the end effector comprises a surgical tool.

24. The flexible wrist-type element of claim 1, further comprising:

a manually-driven hydraulic drive system having an input mechanism coupled to the input end of the plurality of couplings, wherein the drive system generates the input force; and

an end effector coupled to the output end of the plurality of couplings, wherein the end effector comprises a surgical tool and moves in response to receiving at least the portion of the input force transmitted by the plurality of couplings.

25. The flexible wrist-type element of claim 1, wherein at least one of the body housing and the hub comprise an electrically non-conductive material, and further comprising an end effector connected to the hub and in communication with an electrically conductive portion within the body housing and the hub, wherein the end effector is configured to receive an electrical current delivered via the electrically conductive portion.

26. A flexible wrist-type element, comprising:

a body housing extending along a first longitudinal axis;

a hub at least partially extending along a second longitudinal axis and movably connected to the body housing, wherein the hub comprises a first end movable to a first position defining a first angle between the second longitudinal axis and the first longitudinal axis of the body housing, wherein the first angle is greater than zero degrees;

a plurality of couplings comprising a plurality of elements movably interconnected by a plurality of joints, wherein the plurality of couplings are movably positionable relative to the body housing and the hub, wherein the plurality of couplings have an input end adjacent to the body housing and an opposing output end adjacent to the first end of the hub, wherein the input end is configured to receive an input force comprising at least one of an axial force or a torsional force, and wherein the plurality of couplings are configured to transmit at least a portion of the input force from the input end to the output end when the first end of the hub is in the first position defining the first angle;

a guide element movably connected to the body housing, the hub and the plurality of couplings, wherein the guide element further comprises a surface that defines limits for movement of the plurality of couplings, wherein the guide element is movable to a second angle relative to the body housing when the first end of the hub is in the first position defining the first angle relative to the body housing, wherein the second angle is less than the first angle; and

a guide housing connected to the body housing and the hub via a movable connection with the guide element, wherein the guide housing is further movably connected to at least one of the plurality of couplings and comprises a support surface supporting the at least one of the plurality of couplings during movement of the first end of the hub to the first position defining the first angle.

27. The flexible wrist-type element of claim 26, further comprising:

a manually-driven hydraulic drive system having an input mechanism coupled to the input end of the plurality of couplings, wherein the drive system generates the input force; and

an end effector coupled to the output end of the plurality of couplings, wherein the end effector comprises a surgical tool and moves in response to receiving at least the portion of the input force transmitted by the plurality of couplings.

28. A flexible wrist-type element, comprising:

a body housing extending along a first longitudinal axis;

a hub at least partially extending along a second longitudinal axis and movably connected to the body housing, wherein the hub comprises a first end movable to a first position defining a first angle between the second longitudinal axis and the first longitudinal axis of the body housing, wherein the first angle is greater than zero degrees;

a plurality of couplings comprising a plurality of elements movably interconnected by a plurality of joints, wherein the plurality of couplings are movably positionable relative to the body housing and the hub, wherein the plurality of couplings have an input end adjacent to the body housing and an opposing output end adjacent to the first end of the hub, wherein the input end is configured to receive an input force comprising at least one of an axial force or a torsional force, and wherein the plurality of couplings are configured to transmit at least a portion of the input force from the input end to the output end when the first end of the hub is in the first position defining the first angle;

a guide element movably connected to the body housing, the hub and the plurality of couplings, wherein the guide element further comprises a surface that defines limits for movement of the plurality of couplings, wherein the guide element is movable to a second angle relative to the body housing when the first end of the hub is in the first position defining the first angle relative to the body housing, wherein the second angle is less than the first angle;

a guide housing connected to the body housing and the hub via a movable connection with the guide element, wherein the guide housing is further movably connected to at least one of the plurality of couplings and comprises a support surface supporting the at least one of the plurality of couplings during movement of the first end of the hub to the first position defining the first angle;

a drive system having an input mechanism coupled to the input end of the plurality of couplings, wherein the drive system generates the input force; and

an end effector coupled to the output end of the plurality of couplings, wherein the end effector moves in response to receiving at least the portion of the input force transmitted by the plurality of couplings.

29. The flexible wrist-type element of claim 28, wherein the drive system comprises a manually-driven hydraulic system, and wherein the end effector comprises a surgical tool.