Adjustable laparoscopic instrument handle

• US 8,986,287 B2
• Filed: 12/15/2011
• Issued: 03/24/2015
• Est. Priority Date: 02/14/2011
• Status: Active Grant

• Current Assignee: IMDS LLC
• Original Assignee: Adrian E. Park, IMDS LLC
• Inventors: Park, Adrian E., Shirley, Brady R., Triplett, Daniel J., Ewer, Darin
• Primary Examiner(s): FARAH, AHMED M
• Application Number:
  US13/326,911
• Publication Number:
  US 20120209254A1
• Time in Patent Office: 1,195 Days
• Field of Search: 606/1, 606/130, 606167-171, 606205-209, 600/101, 600104-106, 600/111, 600/14, 600135-139, 600/160, 600/166
• US Class Current: 606/1
• CPC Class Codes: A61B 17/06061 Holders for needles or sutures, e.g. racks, stands hand-held holding instruments A61B17/0483; holders for articles A61B50/20; racks for syringes or for hypodermic or infusion needles A61M5/008
• CPC Class Codes: A61B 17/2909 Handles
• CPC Class Codes: A61B 2017/00424 ergonomic, e.g. fitting in fist
• CPC Class Codes: A61B 2017/291 the position of the handle being adjustable with respect to the shaft
• CPC Class Codes: A61B 2017/292 connection of actuating rod to handle, e.g. ball end in recess
• CPC Class Codes: A61B 2017/2947 Pivots
• CPC Class Codes: A61B 90/70 Cleaning devices specially adapted for surgical instruments

Abstract

Instrument handles are adjustable relative to an end effector of the instrument. The handles may be releasably locked in selected positions and/or orientations relative to the end effector. When the lock is released, the handles may be moved to a different position and/or orientation relative to the end effector, and locked in place. The handles may pivot relative to the end effector around one or more joints. The handles may pivot about an axis of a hinge joint or a point of a ball and socket joint. The axis of the hinge joint may be aligned parallel or perpendicular to a center longitudinal axis of the end effector, or of a shaft between the handles and the end effector.

Claims

1. A surgical instrument for improved ergonomic positions, comprising:

a working shaft section at a distal end of the surgical instrument;

a first pivot comprising a pivot head portion comprising three distinct slots on the surface of the pivot head portion, the three distinct slots are configured to receive a locking member, wherein the locking member is connected to a handle section;

a second pivot; and

the handle section positioned at a proximal end of the surgical instrument comprising a first handle and a second handle, with the handle section pivotable relative to the working shaft section about the first pivot, and wherein the first and second handles are pivotably connected to each other about the second pivot;

wherein the first handle comprises a button positioned on a top surface of the first handle and a projection portion extending from a proximal end of the first handle, wherein the projection portion comprises a recess portion recessed into the projection portion.

2. The surgical instrument of claim 1, wherein the second pivot is not coaxial with the first pivot.

3. The surgical instrument of claim 2, further comprising an end effector at a distal end of the working shaft section, wherein the end effector remains in a substantially constant functional state as the handle section pivots about the first pivot.

4. The surgical instrument of claim 3, further comprising an actuator engaged with the second handle and the end effector, the actuator configured to actuate the end effector in response to moving the second handle relative to the first handle, wherein the actuator defines an actuation path length between the second handle and the end effector, and wherein the actuation path length remains substantially constant as the handle section pivots relative to the working shaft section through the first pivot such that pivoting the handle section relative to the working shaft section does not affect the end effector.

5. The surgical instrument of claim 2, wherein the first pivot comprises:

a pivot housing comprising at least one pivot pin hole formed therein;

at least one pivot pin; and

at least one pivot pin hole formed in the first handle, wherein the pivot housing is pivotably connected to the first handle about the at least one pivot pin threaded through the at least one pivot pin hole of the first handle and the at least one pivot pin hole of the pivot housing.

6. The surgical instrument of claim 5, wherein the first pivot further comprises:

at least one stop pin slot formed in the pivot housing;

at least one stop pin hole formed in the first handle; and

at least one stop pin, wherein the at least one stop pin is threaded through the at least one stop pin hole formed in the first handle and into the at least one stop pin slot formed in the pivot housing, and wherein the size and shape of the at least one stop pin slots is configured to prevent the first handle from pivoting relative to the working shaft section beyond a predetermined angular range in either direction.

7. The surgical instrument of claim 2, wherein the second pivot comprises:

a latch release cavity formed in the second handle;

a second handle pivot pin; and

at least one second handle pivot pin hole formed in the first handle, wherein the second handle pivot pin is threaded through the at least one second handle pivot pin hole formed in the first handle and through the latch release cavity formed in the second handle to pivotably connect the second handle relative to the first handle.

8. A method for improved ergonomics during surgery, the method comprising:

providing a surgical instrument for improved ergonomics, the surgical instrument comprising;

a working shaft section at a distal end of the surgical instrument;

a first pivot comprising a pivot head portion comprising three distinct slots on the surface of the pivot head portion, the three distinct slots are configured to receive a locking member, wherein the locking member is connected to a handle section;

a second pivot; and

the handle section at a proximal end of the surgical instrument comprising a first handle and a second handle, with the handle section pivotable relative to the working shaft section about the first pivot, and wherein the first and second handles are pivotably connected to each other about the second pivot;

,

wherein the first handle comprises a button positioned on a top surface of the first handle and a projection portion extending from a proximal end of the first handle, wherein the projection portion comprises a recess portion recessed into the projection portion;

pivoting the handle section relative to the working shaft section about the first pivot; and

pivoting the first and second handles relative to each other about the second pivot.

9. The method of claim 8, wherein the second pivot is not coaxial with the first pivot.

10. The method of claim 9, further comprising an end effector at a distal end of the working shaft section, wherein the end effector remains in a substantially constant functional state as the handle section pivots about the first pivot.

11. The method of claim 10, further comprising an actuator engaged with the second handle and the end effector, the actuator configured to actuate the end effector in response to moving the second handle relative to the first handle, wherein the actuator defines an actuation path length between the second handle and the end effector, and wherein the actuation path length remains substantially constant as the handle section pivots relative to the working shaft section through the first pivot.

12. The method of claim 9, wherein the first pivot comprises:

a pivot housing comprising at least one pivot pin hole formed therein;

at least one pivot pin; and

at least one pivot pin hole formed in the first handle, wherein the pivot housing is pivotably connected to the first handle about the at least one pivot pin threaded through the at least one pivot pin hole of the first handle and the at least one pivot pin hole of the pivot housing.

13. The method of claim 12, wherein the first pivot further comprises:

at least one stop pin slot formed in the pivot housing;

at least one stop pin hole formed in the first handle; and

at least one stop pin, wherein the at least one stop pin is threaded through the at least one stop pin hole formed in the first handle and into the at least one stop pin slot formed in the pivot housing, and wherein the size and shape of the at least one stop pin slots is configured to prevent the first handle from pivoting relative to the working shaft section beyond a predetermined angular range in either direction.

14. A surgical instrument for improved ergonomic positions, comprising:

a working shaft section at a distal end of the surgical instrument;

a first pivoting means;

a second pivoting means; and

a handle section at a proximal end of the surgical instrument comprising a first handle and a second handle, with the handle section pivotable relative to the working shaft section about the first pivoting means, and wherein the first and second handles are pivotably connected to each other about the second pivoting means;

wherein the first handle comprises a projection portion extending from a proximal end of

the first handle and a recess portion recessed into the projection portion.

15. The surgical instrument of claim 14, wherein the second pivoting means is not coaxial with the first pivoting means.

16. The surgical instrument of claim 15, further comprising an end effector at a distal end of the working shaft section, wherein the end effector remains in a substantially constant functional state as the handle section pivots about the first pivot.

17. A surgical instrument for improved ergonomic positions, comprising:

a working shaft section at a distal end of the surgical instrument;

an end effector at a distal end of the working shaft section;

a handle section at a proximal end of the surgical instrument; and

a pivot section intermediate the working shaft section and the handle section, wherein the handle section is pivotable relative to the working shaft section and the end effector remains in a substantially constant functional state as the handle section pivots relative to the working shaft section, wherein the handle section can be selectively positioned in three angled positions relative to the working shaft section;

wherein the pivot section comprises a pivot head portion comprising three distinct slots on the surface of the pivot head portion, the three distinct slots are configured to receive a locking member, wherein the locking member is connected to the handle section.

18. The surgical instrument of claim 17, further comprising a longitudinal axis defined by the working shaft section, a handle section axis, and an angle α

a defining an angular relationship between the longitudinal axis and the handle section axis, wherein the handle section can be selectively positioned in an infinite number of angled positions relative to the longitudinal axis of the working shaft section over a range of angles defined by an angle α

_max and an angle α

_min.

19. The surgical instrument of claim 18, wherein the handle section can be selectively positioned in multiple discrete angled positions α

relative to the longitudinal axis of the working shaft section.

20. The surgical instrument of claim 19, wherein the handle section can be selectively positioned in three discrete angled positions α

relative to the longitudinal axis of the working shaft section.

21. The surgical instrument of claim 19, wherein the three discrete angled positions α

are about −

35°

, 0°

, and 35°

.

22. The surgical instrument of claim 18, wherein α

_max is any number between about 0° and

180° and

α

_min is any number between about 0° and

−

180°

.

23. The surgical instrument of claim 22, wherein α

_max is any number between about 0° and

90° and

α

_min is any number between about 0° and

−

90°

.

24. A method for improved ergonomics during surgery, the method comprising:

providing a surgical instrument for improved ergonomics, the surgical instrument comprising;

a working shaft section at a distal end of the surgical instrument;

an end effector at a distal end of the working shaft section;

a handle section at a proximal end of the surgical instrument;

a button positioned on a top surface of a first handle of the handle section; and

a pivot section intermediate the working shaft section and the handle section, wherein the pivot section comprises a pivot head portion comprising three distinct slots on the surface of the pivot head portion, the three distinct slots are configured to receive a locking member, wherein the locking member is connected to the handle section; and

pivoting the handle section relative to the working shaft section, wherein the end effector remains in a substantially constant functional state as the handle section pivots, and wherein the handle section can be selectively positioned in at least three angled positions relative to the working shaft section.

25. The method of claim 24, further comprising:

providing the surgical instrument for improved ergonomics, wherein the surgical instrument further comprises;

a longitudinal axis defined by the working shaft section;

a handle section axis; and

an angle α

defining an angular relationship between the longitudinal axis and the handle section axis, wherein the handle section can be selectively positioned in an infinite number of angled positions relative to the longitudinal axis of the working shaft section over a range of angles defined by an angle α

_max and an angle α

_min;

selecting an angle position from the infinite number of angled positions between α

_max and an angle α

_min; and

pivoting the handle section to the selected angle position.

26. The method of claim 25, wherein α

_max, is any number between about 0° and

180° and

α

_min is any number between about 0° and

−

180°

.

27. The method of claim 24, further comprising:

providing the surgical instrument for improved ergonomics, wherein the surgical instrument further comprises;

a longitudinal axis defined by the working shaft section;

a handle section axis; and

an angle α

defining an angular relationship between the longitudinal axis and the handle section axis, wherein the handle section can be selectively positioned in multiple discrete angled positions α

relative to the longitudinal axis of the working shaft section;

selecting a discrete angled position α

from the multiple discrete angled positions; and

pivoting the handle section to the selected discrete angled position α

.

28. The method of claim 27, further comprising:

providing the surgical instrument for improved ergonomics, wherein the handle section can be selectively positioned in three discrete angled positions;

selecting one of the three discrete angled positions; and

pivoting the handle section to the selected discrete angled position.

29. The method of claim 27, wherein the three discrete angled positions α

are about −

35°

, 0°

, and 35°

.

30. A surgical instrument for improved ergonomic positions, comprising:

a working shaft section at a distal end of the surgical instrument;

an end effector at a distal end of the working shaft section; and

a handle section at a proximal end of the surgical instrument, wherein the handle section comprises a first handle having a proximal end, a distal end, two side surfaces, and a top surface, with a projection portion extending from the proximal end of the first handle and a recess portion recessed into the projection portion opposite the top surface, wherein the top surface comprises a button at the distal end of the first handle, wherein the handle section is pivotable relative to the working shaft section, and wherein the end effector remains in a substantially constant functional state as the handle section pivots relative to the working shaft section.

31. The surgical instrument of claim 30, wherein the top surface curves downward in the distal to proximal direction and has a spatulate shape.

32. The surgical instrument of claim 31, wherein the top surface substantially lies along a radius of curvature.

33. The surgical instrument of claim 32, wherein the radius of curvature is between about 2 and 4 inches.

34. The surgical instrument of claim 32, wherein the radius of curvature is between about 2.5 inches and 3.5 inches.

35. The surgical instrument of claim 32, wherein the radius of curvature is about 2.9 inches.

36. The surgical instrument of claim 31, wherein the top surface has a convex or rounded shape in the lateral direction between the two side surfaces.

37. The surgical instrument of claim 31, wherein the top surface has a maximum width and a minimum width in the lateral direction between the two side surfaces.

38. The surgical instrument of claim 37, wherein the minimum width of the top surface is located closer to the distal end of the first handle and the maximum width of the top surface is located closer to the proximal end of the first handle.

39. The surgical instrument of claim 38, wherein the minimum width is between about 0.25 inches and about 0.75 inches.

40. The surgical instrument of claim 38, wherein the maximum width is between about 0.5 inches and about 1.25 inches.

41. The surgical instrument of claim 38, wherein the minimum width is about 0.5 inches and the maximum width is about 0.88 inches.

42. The surgical instrument of claim 31, wherein at least one of the two side surfaces further comprises a thumb or finger rest area.

43. The surgical instrument of claim 31, wherein the first handle further comprises a finger loop.

44. The surgical instrument of claim 30, wherein the first handle further comprises a comfort material.

45. The surgical instrument of claim 44, wherein the comfort material is silicone.

46. The surgical instrument of claim 45, wherein the silicone comfort material is applied to the at least one of the first and second handles by an over-molding manufacturing process.

47. The surgical instrument of claim 30, further comprising a second handle with at least one finger contact surface.

48. The surgical instrument of claim 47, wherein the at least one finger contact surface substantially lies along a radius of curvature.

49. The surgical instrument of claim 48, wherein the radius of curvature is between about 1.5 and 3.5 inches.

50. The surgical instrument of claim 48, wherein the radius of curvature is between about 2 inches and 3 inches.

51. The surgical instrument of claim 48, wherein the radius of curvature is about 2.5 inches.

52. The surgical instrument of claim 48, wherein the second handle further comprises a finger loop having a first finger contact surface configured to receive the ring finger and the middle finger, a projection having a second finger contact surface configured to receive the pinky finger, and a recess portion having a third finger contact surface configured to receive the index finger, wherein the first and second finger contact surfaces substantially lie along a radius of curvature of about 2.5 inches, and wherein the third finger contact surface is offset from the radius of curvature by about 0.0625 inches.

53. A method for improved ergonomics during surgery, the method comprising:

providing a surgical instrument for improved ergonomics, the surgical instrument comprising;

a working shaft section at a distal end of the surgical instrument;

an end effector at a distal end of the working shaft section; and

a handle section at a proximal end of the surgical instrument, wherein the handle section comprises a first handle having a proximal end, a distal end, two side surfaces, and a top surface, with a projection portion extending from the proximal end of the first handle and a recess portion recessed into the projection portion opposite the top surface, wherein the top surface comprises a button at the distal end of the first handle, wherein the handle section is pivotable relative to the working shaft section; and

pivoting the handle section relative to the working shaft section, wherein the end effector remains in a substantially constant functional state as the handle section pivots relative to the working shaft section.

54. The method of claim 53, wherein the top surface curves downward in the distal to proximal direction and has a spatulate shape.

55. The method of claim 54, wherein the top surface substantially lies along a radius of curvature.

56. The method of claim 55, wherein the radius of curvature is between about 2 and 4 inches.

57. The method of claim 55, wherein the radius of curvature is between about 2.5 inches and 3.5 inches.

58. The method of claim 55, wherein the radius of curvature is about 2.9 inches.

59. A surgical instrument for improved ergonomic positions, comprising:

a working shaft section at a distal end of the surgical instrument;

a handle section at a proximal end of the surgical instrument, with the handle section pivotable relative to the working shaft section, wherein the handle section comprises a first handle with a top surface and a projection portion, the projection portion extending from the proximal end of the first handle and a recess portion recessed into the projection portion opposite the top surface; and

a locking mechanism that prevents the handle section from pivoting relative to the working shaft section when the locking mechanism is engaged, and wherein the locking mechanism allows the handle section to pivot relative to the working shaft section when the locking mechanism is not engaged, wherein the locking mechanism is connected to the handle section and engages a pivot housing comprising three distinct slots on the surface of the pivot housing.

60. The surgical instrument of claim 59, wherein the locking mechanism further comprises:

a pivot section comprising the pivot housing comprising a first locking surface; and

a locking member comprising a second locking surface, wherein the first locking surface and the second locking surface are configured to engage with each other in a first state to lock the pivot section and prevent the handle section from pivoting relative to the working shaft section, and wherein the first locking surface and the second locking surface are configured to disengage with each other in a second state to unlock the pivot section and allow the handle section to pivot relative to the working shaft section.

61. The surgical instrument of claim 60, further comprising a longitudinal axis defined by the working shaft section, a handle section axis, and an angle a defining an angular relationship between the longitudinal axis and the handle section axis, wherein the handle section can be selectively positioned in an infinite number of angled positions relative to the longitudinal axis of the working shaft section over a range of angles defined by an angle α

_max and an angle α

_min and wherein the first and second locking surfaces are configured to lock at any angled position within the range of angles defined by α

_max and α

_min.

62. The surgical instrument of claim 61, wherein the handle section can be selectively positioned in multiple discrete angle positions relative to the longitudinal axis of the working shaft section over a range of angles defined by an angle α

_max and an angle α

_min, and wherein the first and second locking surfaces are configured to lock in the multiple discrete angled positions within the range of angles defined by α

_max and α

_min.

63. The surgical instrument of claim 62, wherein the first locking surface comprises one or more teeth and the second locking surface comprises one or more teeth configured to engage the one or more teeth of the first locking surface.

64. The surgical instrument of claim 62, wherein the handle section can be selectively positioned in three discrete angled positions relative to the longitudinal axis of the working shaft section, and wherein the first and second locking surfaces are configured to lock in three discrete angled positions.

65. The surgical instrument of claim 64, wherein the first locking surface is the three distinct slots.

66. The surgical instrument of claim 64, wherein the three discrete angled positions are about 35°

, 0°

, and −

35°

.

67. The surgical instrument of claim 61, wherein at least one of the first locking surface and the second locking surface comprises a frictional material that allows the first locking surface and the second locking surface to frictionally engage one another at any point and at any angle.

68. A method for improved ergonomics during surgery, the method comprising:

providing a surgical instrument for improved ergonomics, the surgical instrument comprising;

a working shaft section at a distal end of the surgical instrument; and

a handle section at a proximal end of the surgical instrument, with the handle section pivotable relative to the working shaft section, wherein the handle section comprises a first handle with a top surface and a projection portion, the projection portion extending from the proximal end of the first handle and a recess portion recessed into the projection portion opposite the top surface;

wherein a pivot section comprises a locking mechanism that prevents the handle section from pivoting relative to the working shaft section when the locking mechanism is engaged, and wherein the locking mechanism allows the handle section to pivot relative to the working shaft section when the locking mechanism is not engaged, wherein the locking mechanism is connected to the handle section and engages a pivot housing comprising three distinct slots on a surface of the pivot housing;

disengaging the locking mechanism to allow the handle section to pivot;

pivoting the handle section to a desired angle position; and

engaging the locking mechanism to prevent the handle section from pivoting.

69. The method of claim 68, further comprising:

providing the surgical instrument for improved ergonomics, wherein the surgical instrument further comprises;

the pivot section comprising the pivot housing comprising a first locking surface; and

a locking member comprising a second locking surface, wherein the first locking surface and the second locking surface are configured to engage with each other in a first state to lock the pivot section and prevent the handle section from pivoting relative to the working shaft section, and wherein the first locking surface and the second locking surface are configured to disengage with each other in a second state to unlock the pivot section and allow the handle section to pivot relative to the working shaft section;

disengaging the first locking surface and the second locking surface in the second state;

pivoting the handle section to a desired angle position; and

engaging the first locking surface and the second locking surface in the first state.

70. The method of claim 69, wherein the handle section can be selectively positioned in multiple discrete angle positions relative to the longitudinal axis of the working shaft section, and wherein the first and second locking surfaces are configured to lock in the multiple discrete angled positions.

71. The method of claim 70, wherein the first locking surface comprises one or more teeth and the second locking surface comprises one or more teeth configured to engage the one or more teeth of the first locking surface.

72. The method of claim 70, wherein the handle section can be selectively positioned in three discrete angled positions relative to the longitudinal axis of the working shaft section, and wherein the first and second locking surfaces are configured to lock in three discrete angled positions.

73. A surgical instrument for improved ergonomic positions, comprising:

a working shaft section at a distal end of the surgical instrument;

an end effector at a distal end of the working shaft section;

a handle section at a proximal end of the surgical instrument, wherein the handle section comprises a first handle and a second handle;

a pivot section intermediate the handle section and the working shaft section, wherein the handle section is pivotable relative to the working shaft section about the pivot section, wherein the pivot section comprises a pivot head portion comprising three distinct slots on the surface of the pivot head portion, the three distinct slots are configured to receive a locking member, wherein the locking member is connected to the handle section; and

an actuator comprising a proximal end and a distal end, wherein the proximal end of the actuator is engaged with at least one of the first and second handles and the distal end of the actuator is coupled to the end effector such that moving the first and second handles relative to each other causes the actuator to affect the end effector.

74. The surgical instrument of claim 73, wherein the actuator comprises an elongated flexible member having a proximal end and a distal end, and wherein the proximal end of the elongated flexible member engages the second handle and the distal end of the elongated flexible member engages the end effector.

75. The surgical instrument of claim 74, wherein the elongated flexible member is a cable that can flex or bend laterally while substantially resisting longitudinal tension forces.

76. The surgical instrument of claim 75, wherein the pivot section further comprises a pivot pin with a guide hole formed through the pivot pin, the guide hole being configured to receive the cable therethrough and to substantially retain the cable along the centerline of the pivot section as the handle section articulates with respect to the working shaft section.

77. The surgical instrument of claim 76, further comprising a tension member configured to apply a substantially constant tension force to the cable.

78. The surgical instrument of claim 77, wherein the tension member is a spring.

79. The surgical instrument of claim 73, wherein the actuator comprises two rigid portions connected by a flexible portion disposed between the two rigid portions, wherein the two rigid portions connected by the flexible portion substantially resist tension and compression forces applied in the longitudinal direction and allow the two rigid portions to articulate with respect to each other, so that the actuator can transmit tension and compression forces to the end effector while allowing the handle section to pivot.

80. The surgical instrument of claim 73, further comprising a working rod having a proximal end and a distal end, wherein the proximal end of the working rod is engaged with the distal end of the actuator, and wherein the distal end of the working rod is engaged with the end effector.

81. The surgical instrument of claim 73, wherein the actuator comprises:

a first rigid portion;

a second rigid portion;

a first actuator pivot;

a second actuator pivot; and

a third actuator pivot, wherein the first actuator pivot engages the first rigid portion with the second handle, the second actuator pivot engages the first rigid portion with the second rigid portion, and wherein the third actuator pivot engages the second rigid portion to a stationary member.

82. The surgical instrument of claim 81, wherein the second actuator pivot is substantially coaxial with the pivot section for at least one positional relationship between the first handle and the second handle.

83. The surgical instrument of claim 81, wherein a mechanical advantage acting on the second rigid portion, through the first rigid portion, corresponds to a ratio of about 10.

84. A method for improved ergonomics during surgery, the method comprising:

providing a surgical instrument for improved ergonomics, the surgical instrument comprising;

a working shaft section at a distal end of the surgical instrument;

an end effector at a distal end of the working shaft section;

a handle section at a proximal end of the surgical instrument, with a projection portion extending from the proximal end of the first handle and a recess portion recessed into the projection portion opposite the top surface, wherein the top surface comprises a button at the distal end of the first handle, with the handle section pivotable relative to the working shaft section about a pivot, and wherein the handle section comprises a first handle and a second handle; and

an actuator comprising a proximal end and a distal end, wherein the proximal end of the actuator is engaged with at least one of the first and second handles and the distal end of the actuator is coupled to the end effector such that moving the first and second handles relative to each other causes the actuator to affect the end effector;

moving the first and second handles relative to each other to cause the actuator to affect the end effector.

85. The method of claim 84, wherein the actuator comprises an elongated flexible member having a proximal end and a distal end, and wherein the proximal end of the elongated flexible member engages the second handle and the distal end of the elongated flexible member engages the end effector.

86. The method of claim of claim 85, wherein the elongated flexible member is a cable that can flex or bend laterally while substantially resisting longitudinal tension forces.

87. The method of claim of claim 86, wherein the pivot further comprises a pivot pin with a guide hole formed through the pivot pin, the guide hole being configured to receive the cable therethrough and to substantially retain the cable along the centerline of the pivot as the handle section articulates with respect to the working shaft section.

88. The method of claim of claim 87, further comprising a tension member configured to apply a substantially constant tension force to the cable.