Trocar seal with retraction induced image

1. A trocar for surgical instruments, comprising:

a) a cannula; and

b) a housing having an alignment channel, the alignment channel having an outside diameter; and

c) an instrument seal, the instrument seal comprising a bending portion and a base portion, the base portion having a diameter greater than the outside diameter of the alignment channel, the bending portion and base portion being spaced relative the alignment channel such that when a surgical instrument is retracted the bending portion inverts and does not enter the alignment channel, and the alignment channel being nested in the instrument seal.

2. The trocar of claim 1 , wherein alignment channel has a length and an inside diameter, and the length is greater than 2 times the inside diameter.

3. The trocar of claim 1 , wherein the base portion and bending portion have respective wall thicknesses with a ratio between about 1.5:1 and about 4:1.

4. The trocar of claim 1 , wherein the bending portion has a general frusto-conical geometry.

5. The trocar of claim 4 , wherein the base portion has a generally cylindrical geometry.

6. The trocar of claim 1 , further comprising a flared portion connected to the proximal end of the cannula.

7. The trocar of claim 1 , wherein the bending portion further comprises a lip defining an opening.

8. The trocar of claim 1 , wherein the instrument seal further comprises a hinge area adjacent the base and bending portions.

9. The trocar of claim 1 , wherein the majority of the axial length of the alignment channel is axially coincident with the instrument seal.

10. The trocar of claim 1 , wherein the instrument seal further comprises an annular mounting seal.

11. A method for processing a trocar for surgery, comprising:

a) Obtaining the trocar of claim 1 ;

b) Sterilizing the trocar;

c) Storing the trocar in a sterile container.

12. A trocar, comprising:

a) a cannula with a distal end;

b) a housing with a proximal end;

c) an alignment channel aligned with the cannula and positioned distally relative to the housing proximal end, the alignment channel having a length, an outside diameter, and an inside diameter, the length being greater than the inside diameter;

d) an instrument seal comprising a lip defining an opening aligned with the alignment channel and positioned distally relative to the alignment channel, a bending portion extending laterally and proximally from the lip, a base portion having a diameter greater than the outside diameter of the alignment channel, a hinge area adjacent the base and bending portions, and a mounting seal, wherein the base and bending portions have respective wall thicknesses and the base portion is thicker than the bending portion; and

e) a closure valve aligned with and positioned distally from the instrument seal, the instrument seal being nested in the closure valve; wherein the bending and base portions of the instrument seal are spaced relative the alignment channel such that when a surgical instrument is retracted the bending portion inverts and the lip does not enter the alignment channel.

13. The trocar of claim 12 , wherein the thickness ratio of the base portion and bending portion is between about 2:1 and about 3:1.

14. The trocar of claim 12 , wherein the length of the alignment channel twice the inside diameter and less than five times the inside diameter.

15. The trocar of claim 12 , wherein the base portion abuts the alignment channel.

16. The trocar of claim 12 , wherein the alignment channel, instrument seal, and closure valve are nested.

17. The trocar of claim 16 , wherein the majority of the axial length of the instrument seal is axially coincident with the closure valve, and the majority of the axial length of the alignment channel is axially coincident with the instrument seal.

18. A trocar for surgical instruments, comprising:

a) a cannula

b) a housing having an alignment channel, the alignment channel having an outside diameter; and

c) an instrument seal, the instrument seal comprising a bending portion and a base portion, the base portion having a diameter greater than the outside diameter of the alignment channel, the bending portion and base portion being spaced relative the alignment channel such that when a surgical instrument is retracted the bending portion inverts and does not enter the alignment channel.

19. The trocar of claim 18 , wherein alignment channel has a length and an inside diameter, and the length is greater than 2 times the inside diameter.

20. The trocar of claim 18 , wherein the base portion and bending portion have respective wall thicknesses with a ratio between about 1.5:1 and about 4:1.

21. The trocar of claim 18 , wherein the bending portion has a general frusto-conical geometry.

22. The trocar of claim 21 , wherein the base portion has a generally cylindrical geometry.

23. The trocar of claim 18 , further comprising a flared portion connected to the proximal end of the cannula.

24. The trocar of claim 18 , wherein the bending portion further comprises a lip defining an opening.

25. The trocar of claim 18 , wherein the instrument seal further comprises a hinge area adjacent the base and bending portions.

26. The trocar of claim 18 , wherein the alignment channel is nested in the instrument seal.

27. A trocar comprising:

a) a cannula with a distal end;

b) a housing with a proximal end;

c) an alignment channel aligned with the cannula and positioned distally relative to the housing proximal end, the alignment channel having a length, an outside diameter, and an inside diameter, the length being greater than the inside diameter; and

d) an instrument seal comprising a lip defining an opening aligned with the alignment channel and positioned distally relative to the alignment channel, a bending portion extending laterally and proximally from the lip, a base portion having a diameter greater than the outside diameter of the alignment channel, a hinge area adjacent the base and bending portions, and a mounting seal.

28. The trocar of claim 27 , wherein the base and bending portions have respective wall thicknesses and the base portion is thicker than the bending portion.