Gear driven triangulation

1. A surgical access port, comprising:

a cylindrical member having a proximal end and a distal end and defining a longitudinal axis;

at least two lumens extending through the cylindrical member from the proximal end to the distal end along the longitudinal axis;

at least one articulation structure disposed in the surgical access port, the at least one articulation structure comprising:

at least two tubular members, each tubular member disposed in a respective lumen;

at least two rotating members, each rotating member disposed along one of the at least two tubular members;

at least one actuating member in contact with the at least two rotating members; and

two rigid members connecting the at least two rotating members to each of the at least two tubular members, wherein each rigid member is pivotable about an axis of rotation of at least one rotating member of the at least two rotating members connected therewith.

2. The surgical access port of claim 1 , wherein the at least one actuating member is a worm gear.

3. The surgical access port of claim 2 , wherein the at least one actuating member is inhibited from linear translation along the longitudinal axis.

4. The surgical access port of claim 2 , wherein the at least two rotating members are gear wheels.

5. The surgical access port of claim 1 , wherein the at least one actuating member is a toothed rack.

6. The surgical access port of claim 5 , wherein the at least two rotating members are pinions.

7. The surgical access port of claim 1 , wherein the at least one actuating member includes an engagement handle extending in a proximal direction.

8. The surgical access port of claim 1 , wherein at least a third rotating member is oriented at an angle other than 180 degrees with respect to the at least two rotating members.

9. The surgical access port of claim 1 , wherein each rotating member is rotatable about an axis transverse to the longitudinal axis of the cylindrical member.

10. A surgical access port, comprising:

a cylindrical member having a proximal end and a distal end and defining a longitudinal axis;

first and second lumens extending through the cylindrical member from the proximal end to the distal end along the longitudinal axis;

an articulation structure disposed in the surgical access port, the articulation structure having:

first and second tubular members, the first and second tubular members disposed in respective first and second lumens;

first and second rotating members, one of the first and second rotating members disposed along one of the first and second tubular members;

an actuating member in contact with the first and second rotating members, wherein the actuating member is a toothed rack; and

first and second rigid members connecting the first and second rotating members to the first and second tubular members.

11. The surgical access port of claim 10 , wherein the first and second rotating members are pinions.

12. The surgical access port of claim 10 , further comprising a third rotating member oriented at an angle other than 180 degrees with respect to the first and second rotating members.

13. The surgical access port of claim 10 , wherein the actuating member is inhibited from linear translation along the longitudinal axis.

14. The surgical access port of claim 10 , wherein each of the first and second rotating members is rotatable about an axis transverse to the longitudinal axis of the cylindrical member.