Cannula assembly

• US 20020128603A1
• Filed: 09/07/2001
• Published: 09/12/2002
• Est. Priority Date: 09/08/2000
• Status: Active Grant

• Current Assignee: Pall Corporation (Danaher Corporation)
• Original Assignee: Pall Corporation (Danaher Corporation)
• Inventors: McDonough, David, Booth, Charles S.
• Granted Patent: US 6,685,665 B2
• Time in Patent Office: Days
• US Class Current: 604/164.01
• CPC Class Codes: A61B 17/3421 Cannulas
• CPC Class Codes: A61B 17/3474 Insufflating needles, e.g. Veress needles
• CPC Class Codes: A61B 2017/3437 with means for removing or absorbing fluid, e.g. wicks or absorbent pads
• CPC Class Codes: A61B 2218/008 for smoke evacuation
• CPC Class Codes: B01D 19/0031 by filtration

Abstract

Cannulas, as well as cannula assemblies including gas filters, are disclosed.

Claims

1. A cannula assembly comprising:

a housing comprising at least a first port and a cannula sleeve, the cannula sleeve comprising a second port, wherein said housing defines a fluid flow path between the first port and the second port, and said housing is arranged to allow a surgical instrument to be removably passed through the second port; and

a gas filter disposed in the housing, across the fluid flow path, wherein said gas filter comprises at least one gas filter element comprising at least one porous medium.

2. The assembly of claim 1, wherein the gas filter comprises a cylindrical filter.

3. The assembly of claim 2, wherein the gas filter comprises a cylindrical pleated filter.

4. The assembly of claim 1, wherein the gas filter comprises a substantially planar filter.

5. The assembly of claim 2, wherein the filter has an opening allowing a surgical instrument to be removably passed through the opening.

6. The assembly of claim 4, wherein the filter has an opening allowing a surgical instrument to be removably passed through the opening.

7. The assembly of claim 2, wherein the housing has at least one side wall having an exterior surface and an interior surface, and the gas filter has a first surface and a second surface, and the first surface of the gas filter contacts the interior surface of the side wall.

8. The assembly of claim 4, wherein the housing has at least one side wall having an exterior surface and an interior surface, and the gas filter has a first surface and a second surface, and the first surface of the gas filter contacts the interior surface of the side wall.

9. The assembly of claim 2, wherein the housing has at least one side wall having an exterior surface and an interior surface, and the gas filter has a first surface and a second surface, and the first surface of the gas filter is spaced from the interior surface of the side wall.

10. The assembly of claim 4, wherein the housing has at least one side wall having an exterior surface and an interior surface, and the gas filter has a first surface and a second surface, and the first surface of the gas filter is spaced from the interior surface of the side wall.

11. The assembly of claim 1, wherein the gas filter comprises at least two gas filter elements, each gas filter element comprising at least one porous medium.

12. The assembly of claim 1, wherein the filter has an effective filtration area of at least about 9 cm².

13. The assembly of claim 12, wherein the filter has an effective filtration area of at least about 18 cm².

14. The assembly of claim 2, wherein the filter has an effective filtration area of at least about 9 cm².

15. The assembly of claim 3, wherein the filter has an effective filtration area of at least about 9 cm².

16. The assembly of claim 4, wherein the filter has an effective filtration area of at least about 9 cm².

17. The assembly of claim 1, wherein the first port has a diameter of at least about 0.08 inches (about 0.2 cm).

18. The assembly of claim 17, wherein the first port has a diameter of at least about 0.2 inches (about 0.5 cm).

19. The assembly of claim 1, wherein the first port comprises two or more openings.

20. The assembly of claim 19, wherein the housing includes at least one side wall including the first port comprising two or more openings.

21. The assembly of claim 1, further comprising a cover movable from a first position to a second position, wherein the first position allows gas flow through the first port, and the second position prevents gas flow through the second port.

22. The assembly of claim 21, wherein the cover is adjustable between the first position and the second position.

23. The assembly of claim 21, wherein the housing includes the cover.

24. The assembly of claim 1, wherein the sleeve includes two or more openings along the length of the sleeve.

25. The assembly of claim 1, wherein the housing comprises a third port, the housing defining a first fluid flow path between the first port and the second port, and a second fluid flow path between the third port and the second port, wherein a first gas filter is disposed in the housing across the first fluid flow path, and the second gas filter is disposed in the housing across the second fluid flow path.

26. The assembly of claim 11, wherein the housing comprises a third port, the housing defining a first fluid flow path between the first port and the second port, and a second fluid flow path between the third port and the second port, wherein a first gas filter is disposed in the housing across the first fluid flow path, and the second gas filter is disposed in the housing across the second fluid flow path.

28. A method for treating gas comprising:

passing at least one gas through the cannula assembly of claim 1.

29. The method of claim 28, comprising passing an insufflation gas and/or a de-sufflation gas through the cannula assembly.

30. The method of claim 28, further comprising passing a surgical instrument into the second port of the cannula assembly.

31. A method for treating gas comprising passing the gas through the cannula assembly of claim 19, wherein gas passes through the two or more openings.

32. A method for treating gas comprising passing the gas through the cannula assembly of claim 24, wherein gas passes through the two or more openings.

35. A method for passing gas into a patient'"'"'s abdominal cavity, comprising passing gas through the cannula of claim 27, wherein gas passing through the two or more openings in the sleeve between the first end and the second end passes into the abdominal cavity.

27. A cannula comprising:

a housing comprising having a first port and a second port, and defining a fluid flow path between the first port and the second port, the housing further comprising a first portion attached to a second portion, the first portion having a larger inner diameter than the second portion, the second portion comprising a cannula sleeve, the sleeve having a first end proximal to the first portion, and a second end distal to the first portion, the second end comprising the second port, wherein the sleeve includes two or more openings between the first end and the second end, and the cannula also defines a fluid flow path between the first port and the additional openings.

33. A method for treating gas comprising passing a gas through a first port of a housing, through a gas filter in the housing to provide a filtered gas, passing the filtered gas through a second port of the housing, and into a patient'"'"'s abdominal cavity.

34. A method for treating gas comprising passing a gas from a patient'"'"'s abdominal cavity, through a second port of a housing, through a gas filter in the housing to provide a filtered gas, and passing the filtered gas through a first port of the housing.