Distally replaceable cable systems in surgical tools

1. A cable-driven surgical tool comprising:

an elongate shaft defining a lumen that extends between a proximal end and a distal end of the elongate shaft;

an end effector operably coupled to the distal end of the elongate shaft; and

a plurality of cable systems extending within the lumen and operably engaging the end effector, each cable system comprising a distal cable portion and a proximal cable portion adjoined by a releasable interconnect,

wherein the distal cable portion exhibits a first diameter and the proximal cable portion exhibits a second diameter greater than the distal cable portion.

2. The cable-driven surgical tool of claim 1 , wherein each releasable interconnect comprises a first connection component located at a terminus of the distal cable portion and a second connection component located at a terminus of the proximal cable portion, the first connection component and the second connection component being configured to mate with one another at a junction.

3. The cable-driven surgical tool of claim 2 , wherein the releasable interconnect is selected from the group consisting of male-female threading, a bayonet connector, a ball connector, a snap connector, and a yin-yang connector.

4. The cable-driven surgical tool of claim 1 , wherein each releasable interconnect is axially offset toward the distal end of the elongate shaft.

5. The cable-driven surgical tool of claim 1 , further comprising:

a window defined in the elongate shaft and providing access to each releasable interconnect within the lumen.

6. The cable-driven surgical tool of claim 1 , wherein the elongate shaft comprises a distal section releasably coupled to a proximal section.

7. The cable-driven surgical tool of claim 1 , further comprising:

a housing operably coupled to the proximal end of the elongate shaft;

wherein the housing is configured for releasable coupling with a robotic manipulator.

8. The cable-driven surgical tool of claim 1 , wherein the plurality of cable systems are configured to articulate the end effector.

9. The cable-driven surgical tool of claim 1 , wherein the distal cable portion and the proximal cable portion comprise different materials.

10. The cable-driven surgical tool of claim 1 , further comprising a wrist that interposes the end effector and the distal end of the elongate shaft, wherein the wrist includes:

a proximal clevis coupled to the distal end of the elongate shaft;

a pair of pivot discs rotationally coupled to the proximal clevis and providing a centerline extending through a center of each pivot disc;

a distal plurality of pulleys mounted to the proximal clevis at a distal wrist axle extending through the pair of pivot discs, the distal wrist axle having a pivot axis radially offset from the centerline of the pair of pivot discs; and

a proximal plurality of pulleys mounted to the proximal clevis at a proximal wrist axle and offset from the distal plurality of pulleys by a gap,

wherein rotation of the pair of pivot discs moves the distal plurality of pulleys and thereby adjusts a size of the gap between the proximal and distal pluralities of pulleys.

11. The cable-driven surgical tool of claim 10 , wherein the pair of pivot discs are movable between a first locked position and a second locked position angularly offset from the first locked position.

12. The cable-driven surgical tool of claim 10 , wherein the end effector is rotatably coupled to the distal wrist axle.

13. A cable-driven surgical tool comprising:

an elongate shaft defining a lumen that extends between a proximal end and a distal end of the elongate shaft;

an end effector operably coupled to the distal end of the elongate shaft;

a plurality of cable systems extending within the lumen and operably engaging the end effector, each cable system comprising a distal cable portion and a proximal cable portion adjoined by a releasable interconnect;

wherein the releasable interconnect is selected from the group consisting of male-female threading, a bayonet connector, a ball connector, a snap connector, and a yin-yang connector; and

a housing operably coupled to the proximal end of the elongate shaft;

wherein the housing is configured for releasable coupling with a robotic manipulator, and

wherein the distal cable portion exhibits a first diameter and the proximal cable portion exhibits a second diameter greater than the distal cable portion.

14. The cable-driven surgical tool of claim 13 , wherein the distal cable portion and the proximal cable portion comprise different materials.

15. The cable-driven surgical tool of claim 13 , further comprising a wrist that interposes the end effector and the distal end of the elongate shaft, wherein the wrist includes:

a proximal clevis coupled to the distal end of the elongate shaft;

a pair of pivot discs rotationally coupled to the proximal clevis and providing a centerline extending through a center of each pivot disc;

a distal plurality of pulleys mounted to the proximal clevis at a distal wrist axle extending through the pair of pivot discs, the distal wrist axle having a pivot axis radially offset from the centerline of the pair of pivot discs; and

a proximal plurality of pulleys mounted to the proximal clevis at a proximal wrist axle and offset from the distal plurality of pulleys by a gap,

wherein rotation of the pair of pivot discs moves the distal plurality of pulleys and thereby adjusts a size of the gap between the proximal and distal pluralities of pulleys.

16. The cable-driven surgical tool of claim 15 , wherein the pair of pivot discs are movable between a first locked position and a second locked position angularly offset from the first locked position.

17. The cable-driven surgical tool of claim 15 , wherein the end effector is rotatably coupled to the distal wrist axle.