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A method of performing a surgical procedure on a body includes providing a cannula having a tubular structure with first and second tubular portions defining first and second passages for receiving surgical instruments. The second tubular portion is inserted inside the body and the first tubular por

A method of performing a surgical procedure on a body includes providing a cannula having a tubular structure with first and second tubular portions defining first and second passages for receiving surgical instruments. The second tubular portion is inserted inside the body and the first tubular portion is inserted so that the first tubular portion extends from an exterior of the body to inside the body. The second tubular portion expands to increase the cross-sectional area of the second passage in the second tubular portion while the second tubular portion is inside the body. The cross-sectional area of the first passage in the first tubular portion is maintained. The first tubular portion has a first thickness and the second tubular portion has a second thickness different than the first thickness.

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1. A system for providing access in a spinal surgical procedure the system comprising:an access device comprising:a first access portion having a first outer surface for engaging the body of a patient and a first inner surface at least partially defining a passage for receiving a plurality of surgic

1. A system for providing access in a spinal surgical procedure the system comprising:an access device comprising:a first access portion having a first outer surface for engaging the body of a patient and a first inner surface at least partially defining a passage for receiving a plurality of surgical instruments used to perform the procedure; anda second access portion attached to said first access portion and having a second outer surface for engaging the body of a patient and having a second inner surface at least partially defining a passage for receiving the surgical instruments;the access device having a proximal portion adapted to be positioned outside of the patient and a distal portion adapted to be positioned near the spine, the outer surface of the distal portion of the access device being expandable to retract the tissue surrounding the spine to provide a surgical field for the spinal surgical procedure;the proximal portion of the access device having a non-pivoted position and a pivoted position adapted to enhance the visibility and access of the surgical field; andan expander configured to be inserted into the passage and to engage at least one of the first inner surface and the second inner surface to cause opposing portions of the distal portion to be moved to increase access to the surgical location. 2. A system as set forth in claim 1 wherein said second access portion is expandable to enable enlargement of a cross-sectional area of said passage in said second access portion to a size which is greater than a cross-sectional area of said passage in said first access portion. 3. A system as set forth in claim 2 wherein said passage, when said second access portion is expanded, has a conical configuration. 4. A system as set forth in claim 2 wherein said second access portion has an arcuate slot and a guide member disposed in said arcuate slot, said guide member being movable from a first terminal end of said slot toward a second terminal end of said slot to enable the cross-sectional area of said passage to increase. 5. A system as set forth in claim 1 wherein said second access portion comprises an arcuate segment of sheet stock rolled into a tubular shape. 6. A system for providing access to a surgical location and for receiving surgical instruments for performing a surgical procedure at the surgical location, said system comprising:a device having an inside surface, an outside surface, a proximal end and a distal end, said inside surface of said device defining a passage for receiving surgical instruments extending from said proximal end to said distal end, said device having a contracted condition and an expanded condition, said passage having a first cross-sectional area at said distal end when said device is in said contracted condition, said passage having a second cross-sectional area at said distal end greater than said first cross-sectional area when said device is in said expanded condition, said second cross-sectional area being greater than a cross-sectional area of said passage at said proximal end when said device is in said expanded condition; andan expander configured to be inserted into the passage to engage said inner surface to cause opposing portions of said device to be moved to increase access to the surgical location. 7. A system as set forth in claim 6 wherein said cross-sectional area of said passage at said proximal end when said device is in said expanded condition is approximately equal to a cross-sectional area of said passage at said proximal end when said device is in said contracted condition. 8. A system as set forth in claim 6 wherein said device has a cylindrical configuration when said device is in said contracted condition. 9. A system as set forth in claim 6 wherein said device has a conical configuration when said device is in said expanded condition. 10. A system as set forth in claim 6 wherein said device includes a first edge movable relative to a second edge of said device that said first edge overlaps, said first edge moving relative to said second edge as said device moves between said contracted and said expanded conditions. 11. A system as set forth in claim 10 further including a guide for guiding movement of said first edge relative to said second edge. 12. A system as set forth in claim 11 wherein said guide includes a guide member connected with one of said first and second edges extending into a slot in said device adjacent to the other one of said first and second edges. 13. A system as set forth in claim 10 wherein said first edge is pivotable relative to said second edge. 14. A system as set forth in claim 13 wherein a proximal end of said first edge is pivotally connected to a proximal end of said second edge. 15. A system as set forth in claim 10 wherein said device includes an arcuate segment of sheet stock rolled into a tubular shape. 16. A system as set forth in claim 6 further including a releasable member for maintaining said device in said contracted condition. 17. A system as set forth in claim 6 further including a proximal portion connected with said proximal end of said device, said proximal portion defining a second passage for receiving surgical instruments, said second passage being a continuation of said passage defined by said device. 18. A system as set forth in claim 17 wherein said device is pivotable relative to said proximal portion. 19. A system as set forth in claim 6 wherein said passage has a diameter in the range of 10 mm to 20 mm at said proximal end. 20. A system as set forth in claim 6 wherein said second cross-sectional area of said passage at said distal end is in the range of 40% to 80% greater than said cross-sectional area of said passage at said proximal end when said device is in said expanded condition. 21. A system as set forth in claim 6 further including an endoscope in said passage for viewing a surgical site in a patient's body. 22. A system as set forth in claim 21 further including a surgical instrument in said passage. 23. A system as set forth in claim 6 further including a surgical instrument in said passage. 24. A system for providing access to a surgical location, the system comprising:an access device having a distal portion, a proximal portion, an outer surface, and an inner surface defining a passage extending along an axis through the access device through which a plurality of instruments can be inserted to the surgical location to perform a surgical procedure, the access device having a contracted condition and an expanded condition, the passage having a first cross-sectional area at a first location proximate the distal portion when the access device is in the contracted condition, the passage having a second cross-sectional area at the first location greater than the first cross-sectional area when the access device is in the expanded condition, the second cross-sectional area being greater than a cross-sectional area of the passage at a second location that is proximal of the first location when the device is in the expanded condition; andan expander device configured to be engagable with the access device to cause the access device to be articulated from the contracted condition to the expanded condition and to be disengagable therefrom during the surgical procedure, the expander further configured to pivot the distal portion of the access device with respect to the proximal portion to increase access to the surgical location. 25. The system of claim 24, wherein the access device further comprises a proximal portion extending distally from the proximal portion and a distal portion extending proximally from the distal portion, the proximal and distal portions being pivotably coupled. 26. The system of claim 24, wherein the access device further comprises a pivot joint that couples the proximal portion with the distal portion at a single location. 27. The system of claim 24, wherein the expander device is configured to b e inserted into the passage and to engage the inside surface of the access device to articulate the access device from the contracted condition to the expanded condition. 28. The system of claim 24, wherein said access device has a cylindrical configuration when said access device is articulated to said contracted condition. 29. The system of claim 28 wherein said access device has a conical configuration when said access device is articulated to said expanded condition. 30. The system of claim 24, further comprising an endoscope in said passage for viewing the surgical location. 31. The system of claim 24, further including at least one surgical instrument configured to be inserted into the passage.