Device and system including mechanical arms

1. A medical surgical device sized and shaped for insertion into a body comprising:

at least one mechanical limb comprising:

a support segment;

a first independently bendable section extending from said support segment and coupled to a first actuator configured to actuate flexion of said bendable section;

a second bendable section, independently bendable of said first flexible section, coupled to said first bendable section, terminating in a tool or a connector for a tool and coupled to a second actuator configured to actuate flexion of said second bendable section;

a first effective segment which extends from and is measured as a straight line connecting: a long axis midpoint of said first bendable section to a long axis midpoint of said second bendable section; and

a second effective segment which extends from and is measured as a straight line connecting: a long axis midpoint of said second bendable section to a distal end of said second bendable section;

wherein one or more of said bendable sections is bendable only in a single bending plane of the respective bendable section long axis;

wherein said length of said first effective segment is, for all configurations of said mechanical limb, about 10-30% longer than said length of said second effective segment.

2. The device of claim 1 , wherein a long axis of said first bendable section is independently bendable in a single first bendable section bending plane.

3. The device of claim 2 , wherein a long axis of said second bendable section is independently bendable in a single second bendable sections bending plane.

4. The device of claim 3 , wherein both said bendable sections are rotatable, each around a corresponding bendable section long axis, where rotation of one bendable section with respect to another bendable section thereby changes an angle between said first bendable section bending plane and said second bendable section bending plane.

5. The device of claim 2 , wherein said first bendable section is only bendable in one direction in said first bending plane, from a straight configuration.

6. The device of claim 3 , wherein said second bendable section is only bendable in one direction in said second bending plane, from a straight configuration.

7. The device of claim 1 , wherein at least one of said bendable sections is rotatable around a corresponding bendable section long axis.

8. The mechanical device according to claim 1 , wherein bending of each said bendable section is distributed along a long axis length of each said bendable section.

9. The mechanical device according to claim 1 , wherein a radius of curvature of each said bendable section is constant along said bendable section, when said section is bent.

10. The device of claim 1 , wherein a long axis length of said first bendable section is at least three times a cross sectional maximum extent said first bendable section perpendicular to a long axis of said first bendable section;

wherein a long axis length of said second bendable section is at least three times a cross sectional maximum extent of said second bendable section perpendicular to said long axis of said a second bendable section.

11. The device of claim 10 , wherein said cross sectional maximum extent of said first bendable section is 5-10 mm.

12. The device of claim 10 , wherein said cross sectional maximum extent of said second bendable section is 3-4 mm.

13. The device according to claim 1 , wherein one or more of:

a first independently bendable section cross sectional maximum extent perpendicular to a first independently bendable section long axis is 10% or less of a long axis length of said first independently bendable section; and

a second bendable section cross sectional maximum extent perpendicular to a second bendable section long axis is 10% or less of a long axis length of said second bendable section.

14. The device of claim 1 , wherein said first bendable section terminates in a coupling section and said second bendable section extends from said coupling section.

15. The device of claim 14 , wherein said coupling section comprises:

a first rigid portion extending from a distal end of said first independently bendable section;

a second rigid portion extending proximally from a proximal end of said second bendable section;

wherein said second rigid portion is disposed within said first rigid portion.

16. The device of claim 1 , wherein said second bendable section extends through said coupling section.

17. The device according to claim 1 , comprising a first limb and a second limb according to said mechanical limb.

18. The device according to claim 17 , wherein said first limb support segment and said second limb support segment are coupled to a base, where long axes of said first limb support segment and said second limb support segment are parallel.

19. The device according to claim 1 , wherein said long axis length of at least one said bendable section is at least four times a cross sectional maximum extent of said bendable section perpendicular to a bendable section long axis.

20. The device according to claim 1 , wherein said bendable sections are sized and bendable such that a separation between said tool or connector for a tool and said first bendable section is reducible to 20% or less of a long axis length of said first bendable section.

21. The device according to claim 1 , wherein said first bendable section and said second bendable section are each bendable by at least 45°.

22. The device of claim 1 , wherein one or more of said bendable sections is bendable by at least 180°.

23. The device of claim 1 , wherein said bendable sections are bendable to a combined total angle of at least 180°.

24. The device of claim 1 , wherein each said bendable section is bendable by at least 180°.

25. The device of claim 1 , wherein a thickness of said support segment is 5-10 mm.

26. The device according to claim 1 , wherein said tool comprises an electrosurgery tip.

27. The device according to claim 1 , comprising:

at least one first elongated element coupled to said first independently bendable section and said first actuator, where flexion of said first independently bendable section is controlled by tension on said at least one first elongated element; and

at least one second elongated element coupled to said second bendable section; and said second actuator, where flexion of said second bendable section is controlled by tension on said at least one second elongated element.

28. The device of claim 27 , wherein said first and said second elongated elements are not attached to said coupling section.

29. The device according to claim 1 , wherein said tool is a grasper comprising:

a first opposing portion;

a second opposing portion coupled to said first opposing portion; and

a torque element coupled to said first and said second opposing portions;

wherein application of torque in a first direction to said torque element moves said torque element towards said first and second opposing portions, increasing a separation between the portions;

wherein application of torque in a second direction to said torque element moves said torque element away from said first and second opposing portions, decreasing a separation between the portions.

30. The grasper according to claim 29 , wherein said torque element is coupled to a grasper elongated element and turning of said elongated element applies torque to said torque element.