Flexible member for angled system

1. An instrument assembly, comprising:

a flexible tube, including,

a first rigid member having a first lumen and a first end;

a second rigid member having a second lumen and a second end; and

a flexible portion having a third end coupled to the first end of the first rigid member and a fourth end coupled to the second end of the second rigid member;

wherein the flexible portion has a third lumen;

wherein the first lumen, the second lumen, and the third lumen are configured to be coupled to form a first liquid flow path;

wherein the flexible portion is configured to transfer a working torque from the first rigid member to the second rigid member;

wherein a flexible fluid seal tube forms an inner layer of the flexible portion and a flexible reinforcing tube forms an outer layer of the flexible portion.

2. The instrument assembly of claim 1 , further comprising:

an external tube having a fourth lumen;

wherein the external tube is configured to extend over the flexible tube;

wherein the external tube has an inner wall that cooperates with an external wall of the flexible tube for a second liquid flow path through the fourth lumen.

3. The instrument assembly of claim 1 , further comprising:

a motor coupled to the flexible tube to provide a torque on the first rigid member.

4. An instrument assembly, comprising:

a flexible tube, including,

a first rigid member having a first lumen and a first end;

a second rigid member having a second lumen and a second end; and

a flexible portion having a third end coupled to the first end of the first rigid member and a fourth end coupled to the second end of the second rigid member;

wherein the flexible portion has a third lumen;

wherein the first lumen, the second lumen, and the third lumen are configured to be coupled to form a first liquid flow path;

wherein the flexible portion is configured to transfer a working torque from the first rigid member to the second rigid member;

wherein the flexible portion includes:

an inner polymer tube extending a first distance from the third end coupled to the first end of the first rigid member to the fourth end coupled to the second end of the second rigid member; and

an external coat formed of a plurality of wires twisted around the inner polymer tube extending a second distance from a fourth end to a fifth end;

wherein the second distance is greater than the first distance;

wherein the fourth end is coupled to the first rigid member beyond the inner polymer tube and the fifth end is coupled to the second rigid member beyond the inner polymer tube.

5. The instrument assembly of claim 4 , wherein each of the plurality of wires extends the second distance.

6. The instrument assembly of claim 4 , wherein the inner polymer tube is a thermoplastic polymer.

7. An instrument assembly, comprising:

a flexible tube, including,

a first rigid member having a first lumen and a first end;

a second rigid member having a second lumen and a second end; and

a flexible portion having a third end coupled to the first end of the first rigid member and a fourth end coupled to the second end of the second rigid member;

wherein the flexible portion has a third lumen;

wherein the first lumen, the second lumen, and the third lumen are configured to be coupled to form a first liquid flow path;

wherein the flexible portion is configured to transfer a working torque from the first rigid member to the second rigid member;

wherein the flexible portion includes:

an inner polymer tube extending a first distance from the third end coupled to the first end of the first rigid member to the fourth end coupled to the second end of the second rigid member; and

an external coat formed of a flat wire twisted around an axis of the inner polymer tube extending a second distance from a fourth end to a fifth end;

wherein the second distance is greater than the first distance;

wherein the fourth end is coupled to the first rigid member beyond the inner polymer tube and the fifth end is coupled to the second rigid member beyond the inner polymer tube.

8. An instrument assembly, comprising:

a flexible tube extending from a first flexible tube end to a second flexible tube end and having a flexible tube lumen that is a first sealed flow path through the flexible tube, including:

a first rigid member extending between a first end and a second end and a first lumen extending through the first and second ends, wherein the second end is the first flexible tube end,

a second rigid member extending between a third end and a fourth end and a second lumen extending through the third and fourth ends, wherein the fourth end is the second flexible tube end,

a first flexible portion extending between a fifth end coupled to the first end of the first rigid member and a sixth end coupled to the third end of the second rigid member, wherein the flexible portion has a third lumen,

a single second flexible portion positioned over the first flexible portion including a twisted member, wherein a first twisted member end is coupled to the first rigid member separate from the first flexible portion and a second twisted member end is coupled to the second rigid member separate from the first flexible portion,

wherein the first flexible portion has an entire length that extends a first distance and the second flexible portion has an entire length that extends a second distance, the second distance being greater than the first distance;

wherein the first lumen, the second lumen, and the third lumen are configured to be coupled to form the flexible tube lumen;

a malleable tube extending from a first malleable tube end to a second malleable tube end and having a malleable tube lumen that is a second sealed flow path through the malleable tube;

wherein the flexible tube is positioned within the malleable tube;

wherein the flexible portion is configured to transfer a working torque from the first rigid member to the second rigid member.

9. The instrument assembly of claim 8 , wherein the first flexible tube end is configured to cut tissue.

10. The instrument assembly of claim 8 , further comprising:

a motor configured to provide torque to the second flexible tube end.

11. The instrument assembly of claim 10 , wherein the flexible tube is configured to rotate within the malleable tube when the motor is providing torque to the second flexible tube end.

12. The instrument assembly of claim 11 , further comprising:

a vacuum source configured to provide suction through the first sealed flow path while the flexible tube is rotating;

an irrigation source configured to provide an irrigation liquid through the second sealed flow path while the flexible tube is rotating.

13. The instrument assembly of claim 11 , wherein the twisted member of the second flexible member includes a plurality of wires twisted together between the first twisted member end and the second twisted member end.

14. The instrument assembly of claim 11 , wherein the twisted member of the second flexible member includes a single flat wire twisted between the first twisted member end and the second twisted member end.

15. An instrument assembly, comprising:

a flexible tube, including,

a first rigid member extending from a first end to a second end and defining a first lumen;

a second rigid member extending from a third end to a fourth end and defining a second lumen; and

a flexible portion coupled to the second end of the first rigid member and the third end of the second rigid member and defining a third lumen, the flexible portion including,

a flexible fluid sealed tube, and

a flexible reinforcing tube;

wherein the flexible portion is configured to transfer a working torque from the first rigid member to the second rigid member;

wherein the flexible fluid sealed tube has an entire length that extends a first distance and the flexible reinforcing tube has an entire length that extends a second distance, the second distance being greater than the first distance.

16. The instrument assembly of claim 15 , wherein the flexible fluid sealed tube is a polymer tube.

17. The instrument assembly of claim 15 , wherein the flexible reinforcing tube is formed from a plurality of wires twisted to form the reinforcing tube.

18. The instrument assembly of claim 15 , wherein the flexible reinforcing tube is formed from a twisted flat planar wire.

19. An instrument assembly, comprising:

a flexible tube, including,

a first rigid member extending from a first end to a second end and defining a first lumen;

a second rigid member extending from a third end to a fourth end and defining a second lumen; and

a flexible portion coupled to the second end of the first rigid member and the third end of the second rigid member and defining a third lumen, the flexible portion including,

a flexible fluid sealed tube, and

a flexible reinforcing tube;

wherein the flexible portion is configured to transfer a working torque from the first rigid member to the second rigid member;

wherein the flexible fluid seal tube forms an inner layer of the flexible portion and the flexible reinforcing tube forms an outer layer of the flexible portion.

20. The instrument assembly of claim 19 , wherein the flexible fluid seal tube is a polymer tube and the flexible reinforcing tube is formed from either a plurality of wires twisted to form the reinforcing tube or a twisted flat planar wire.