Method and devices for performing minimally invasive surgery

1. A method of performing surgery in a body cavity of a body, the body cavity being separated from a space outside the body by a body wall, the method comprising:

providing a first device comprising a first part and a second part;

making a first opening and a second opening into the body wall;

introducing the second part of the first device into the body cavity through the second opening;

passing the second part of the first device out of the body cavity, through the first opening, to the space outside the body;

coupling the first part of the first device to the second part of the first device to make an assembled first device; and

passing the first part of the first device coupled to the second part of the first device into the body cavity through the first opening.

2. The method of claim 1 , wherein the coupling of the first part of the first device to the second part of the first device occurs in the space outside the body.

3. The method of claim 1 , wherein making the first opening includes using a trocar.

4. The method of claim 1 , further comprising using the assembled first device to perform a procedure within the body cavity.

5. The method of claim 1 , further comprising introducing a first port into the first opening such that the first port extends from the space outside the body, through the body wall, and into the body cavity.

6. The method of claim 1 , further comprising uncoupling the first part of the first device from the second part of the first device by passing the first part of the first device and second part of the first device from within the body cavity back through the first opening to the space outside the body, and removing the first part of the first device from the second part of the first device.

7. The method of claim 6 , further comprising passing the second part of the first device back through the first opening and into the body cavity, and

passing the second part back through the second opening thereby removing the second part of the first device from the body cavity.

8. The method of claim 1 , wherein the first device is one of a suction device, electrocautery assembly, a canulator, a clip applier, a cutter, a grasper, an image recorder, an image viewer, a retractor, and a sealer.

9. The method of claim 1 , wherein the first part of the first device is a working end.

10. The method of claim 1 , wherein the second part of the first device is an intermediate portion of a user interface.

11. The method of claim 1 , wherein the first opening has a maximal external transverse dimension of greater than 3 mm.

12. The method of claim 1 , wherein the second opening is made using a trocar.

13. The method of claim 1 , wherein the second opening has a maximal external transverse dimension between 0.1 mm and 3 mm.

14. The method of claim 1 , wherein a maximum external transverse dimension of the first part of the first device is greater than a maximal external transverse dimension of the second part of the first device.

15. The method of claim 1 , wherein the first part of the first device has a maximum external transverse dimension greater than 3 mm.

16. The method of claim 1 , wherein the second part of the first device has a maximum external transverse dimension of between 0.1 mm and 3 mm.

17. A method of surgery, comprising:

making a first opening into a body cavity using a trocar;

introducing a surgical device shaft through a body wall of the body cavity through a second opening into the body cavity, separate from the first opening, so that a proximal portion of the surgical device shaft is external to the body cavity and a distal portion of the surgical device shaft is internal to the body cavity;

passing the distal portion of the surgical device shaft from within the body cavity through the first opening to a space outside the body cavity;

coupling a surgical device tool head to the surgical device shaft to make an assembled surgical device while the distal portion of the surgical device shaft is outside the body cavity;

passing surgical device tool head through the first opening to position the surgical device tool head within the body cavity; and

using the assembled surgical device to perform a surgical procedure within the body cavity.

18. The method of claim 17 , wherein the first opening has a maximal external transverse dimension of greater than 3 mm; and

wherein the second opening has a maximal external transverse dimension between 0.1 mm and 3 mm.

19. A method of assembling a surgical device having a proximal shaft portion and a distal tool portion, comprising:

passing a distal end of the proximal shaft portion from within a body cavity through a first opening in a body wall of the body cavity to outside the body cavity with a portion of the proximal shaft portion still within the body cavity;

coupling the distal tool portion to the distal end of the proximal shaft portion while the distal tool portion and the distal end of the proximal shaft portion are both outside the body cavity; and

passing the distal end of the proximal shaft portion, with the distal tool portion coupled, back through the first opening into the body cavity.

20. The method of claim 19 , wherein the distal tool portion has a maximum external transverse dimension greater than 3 mm, and

wherein the proximal shaft portion has a maximum external transverse dimension of between 0.1 mm and 3 mm.