TROCAR STABILITY ASSEMBLY

• US 20090182282A1
• Filed: 01/15/2009
• Published: 07/16/2009
• Est. Priority Date: 01/15/2008
• Status: Active Grant

• Current Assignee: Applied Medical Resources Corporation (Applied Medical Corporation)
• Original Assignee: Applied Medical Resources Corporation (Applied Medical Corporation)
• Inventors: Michaud, Michael L., Gianneschi, Benjamin A., Albrecht, Jeremy J., Johnson, Gary M., Okihisa, David T., Ahlberg, Russell E.
• Granted Patent: US 8,162,893 B2
• Time in Patent Office: Days
• US Class Current: 604/165.10
• CPC Class Codes: A61B 17/3421 Cannulas
• CPC Class Codes: A61B 17/3423 Access ports, e.g. toroid shape introducers for instruments or hands access sites for liquids A61M39/0247
• CPC Class Codes: A61B 2017/3407 including a base for support on the body
• CPC Class Codes: A61B 2017/347 Locking means, e.g. for locking instrument in cannula
• CPC Class Codes: A61B 2017/349 Trocar with thread on outside
• CPC Class Codes: A61B 2017/3492 against the outside of the body

Abstract

A stability assembly for a trocar cannula includes a conical stability member, a base, and a cannula retention member. The base has a passage defining an inner surface, and a constriction in the passage. The cannula retention member is rotatable within the passage, and advancement of the cannula retention member over the constriction reduces the inner diameter of the passage to restrain a cannula in the passage. Various latch mechanisms including interface surfaces on the base and the cannula retention member can be used in the stability assembly to secure the stability assembly around a cannula. Various conical stability members can be used in the stability assembly.

Claims

1. A stability assembly for a trocar system comprising:

a stability member having a generally conical outer surface and a lumen extending through the stability member;

a base positioned at least partially within the lumen of the stability member, the base having an outer surface and an inner surface defined by a passage extending therethrough, the passage adapted to receive a cannula therethrough, and the inner surface including at least one constriction; and

a cannula retention member positioned at least partially within the passage of the base and rotatably coupled to the base,

wherein the cannula retention member is rotatable between a first position in which the passage of the base and the retention member define a first inner diameter, and a second position in which a portion of the retention member is advanced over the constriction such that the passage of the base and the retention member define a second inner diameter smaller than the first inner diameter.

2. The stability assembly of claim 1, wherein the constriction comprises a ramped surface formed in the passage.

3. The stability assembly of claim 1, further comprising a latch mechanism configured to selectively retain the cannula retention member in the second position.

4. The stability assembly of claim 3, wherein the latch mechanism comprises:

a first mating surface formed on the outer surface of the base; and

a second mating surface formed on the cannula retention mechanism and configured to mate with the first mating surface to prevent movement of the cannula retention member relative to the base; and

the first and second mating surfaces being positioned such that when the cannula retention member is positioned in the second position, the first and second mating surfaces are mated.

5. The stability assembly of claim 4, wherein

the first mating surface comprises at least one ramp formed on the outer surface of the base, the ramp comprising a ramp surface and a detent surface;

and

the second mating surface comprises a follower formed on the cannula retention member, the follower positioned such that in the when the cannula retention member is rotated from the first position to the second position, the follower is advanced up the ramp surface, and when the cannula retention member is in the second position, the follower is retained by the detent surface.

6. The stability assembly of claim 5, wherein the at least one ramp comprises a plurality of ramps formed on the outer surface of the base, each ramp comprising a ramp surface and a detent surface.

7. The stability assembly of claim 5, wherein the cannula retention member comprises:

an actuation lever,

a latch lever coupled to the actuation lever, wherein the follower is disposed at an end of the latch lever.

8. The stability assembly of claim 7, wherein the latch lever is pivotably coupled to the actuation lever by a flexible arm.

9. The stability assembly of claim 7, wherein the latch lever is slidably disposed on the actuation lever.

10. The stability assembly of claim 7, wherein the latch lever comprises a movable arm formed on the actuation lever.

11. The stability assembly of claim 5, wherein the ramp is movable with respect to the base.

12. The stability assembly of claim 4, wherein the first mating surface comprises at least one recess formed on the outer surface of the base, and the second mating surface comprises at least one protrusion extending from the cannula retention member.

13. The stability assembly of claim 3, wherein the latch mechanism comprises:

a first mating surface formed on the inner surface of the base; and

a second mating surface formed on the portion of the cannula retention mechanism positioned within the passage of the base;

the second mating surface being configured to mate with the first mating surface to prevent movement of the cannula retention member relative to the base; and

the first and second mating surfaces being positioned such that when the cannula retention member is positioned in the second position, the first and second mating surfaces are mated.

14. The stability assembly of claim 13, wherein the latch mechanism is configured to selectively retain the cannula retention member in a plurality of positions with respect to the base between the first position and the second position.

15. The stability assembly of claim 13, wherein the first mating surface comprises a plurality of ridges protruding from the inner surface of the base, and the second mating surface comprises a plurality of ridges protruding from the cannula retention member.

16. The stability assembly of claim 13, wherein the first mating surface comprises at least one recess formed in the inner surface of the base, and the second mating surface comprises at least one protrusion extending from the cannula retention member.

17. The stability assembly of claim 13, wherein the first mating surface comprises a plurality of ramps formed on the inner surface of the base, and the second mating surface comprises at least one protrusion extending from the cannula retention member.

18. The stability assembly of claim 13, wherein the cannula retention member comprises:

a loop member having a first end and a second end opposite the first end, a portion of the loop member extending into the passage of the base;

an actuation tab extending adjacent the first end of the loop member; and

a latch tab extending adjacent the second end of the loop member, the at least one protrusion disposed adjacent to the latch tab.

19. A stability assembly for a trocar system comprising:

a stability member adapted to seal an entry port incision, the stability member having a lumen extending therethrough, the lumen defining a longitudinal axis of the stability assembly;

a base positioned at least partially within the lumen, the base having a passage extending along the longitudinal axis, the passage adapted to receive a cannula therein; and

a retention member positioned such that the retention member and the passage define an inner diameter of the stability assembly; and

wherein the retention member is rotatable about the longitudinal axis between a first position wherein the stability assembly has a first inner diameter and a second position wherein the stability assembly has a second inner diameter smaller than the first inner diameter.

20. The stability assembly of claim 19, wherein the base comprises a slot formed therein and the retention member comprises a tab formed thereon, the tab positioned in the slot to maintain a position of the retention member with respect to the base along the longitudinal axis.

21. The stability assembly of claim 19, wherein the retention member comprises at least one protrusion formed on an inner surface thereof.

22. The stability assembly of claim 21, wherein the at least one protrusion comprises a plurality of protrusions, each of the protrusions at a same longitudinal position with respect to the longitudinal axis.

23. The stability assembly of claim 21, wherein the at least one protrusion comprises a plurality of protrusions spaced apart from one another with respect to the longitudinal axis.

24. The stability assembly of claim 19, wherein the passage of the base comprises a ramped inner surface positioned such that the retention member is advanced over the ramped inner surface during movement of the retention member from the first position to the second position.

25. The stability assembly of claim 19, wherein the stability member is contoured to facilitate insertion to the entry port incision.

26. The stability assembly of claim 25, wherein the stability member has a conical profile about the longitudinal axis and an oblong profile about a lateral axis substantially perpendicular to the longitudinal axis.

27. The stability assembly of claim 26, wherein the base is rotatable about the longitudinal axis with respect to the stability member.

28. The stability assembly of claim 25, wherein the stability member is contoured to resist removal from the entry port incision.

29. The stability assembly of claim 25, wherein the base comprises a central opening forming the passage and at least one slot formed adjacent the passage and spaced from the passage by a rib, and wherein the retention member comprises a protrusion positioned in the slot and configured to advance the rib towards the passage as the retention member is rotated from the first position to the second position.

30. A stability assembly for a trocar system comprising:

a stability member adapted to seal an entry port incision, and having a lumen extending therethrough;

a base having an outer surface and an inner surface defined by a passage extending therethrough, the base positioned such that the passage extends through at least a portion of the lumen;

a retention member rotatably coupled to the base, the retention member and the base defining an inner diameter of the stability assembly, and the retention member rotatable between a first position wherein the stability assembly has a first inner diameter and a second position wherein the stability assembly has a second inner diameter smaller than the first inner diameter; and

a latch mechanism configured to selectively maintain the retention member in the second position.

31. The stability assembly of claim 30, wherein the latch mechanism comprises:

a first mating surface formed on the outer surface of the base; and

a second mating surface formed on the retention mechanism and configured to mate with the first mating surface to prevent movement of the retention member relative to the base; and

the first and second mating surfaces being positioned such that when the retention mechanism is positioned in the second position, the first and second mating surfaces are mated.

32. The stability assembly of claim 31, wherein the first mating surface comprises at least one ramp, the ramp comprising a ramp surface and a detent and the second interface surface comprises a pawl.

33. The stability assembly of claim 32, wherein the latch mechanism comprises a ratchet, and wherein the at least one ramp comprises a plurality of ramps.

34. The stability assembly of claim 30, wherein the latch mechanism comprises:

a first mating surface formed on the inner surface of the base; and

a second mating surface formed on the portion of the retention mechanism positioned within the passage of the base;

the second mating surface being configured to mate with the first mating surface to prevent movement of the retention member relative to the base; and

the first and second mating surfaces being positioned such that when the retention member is positioned in the second position, the first and second mating surfaces are mated.

35. The stability assembly of claim 34, wherein the first mating surface comprises at least one ramp, the ramp comprising a ramp surface and a detent and the second interface surface comprises a pawl.

36. The stability assembly of claim 35, wherein the latch mechanism comprises a ratchet, and wherein the at least one ramp comprises a plurality of ramps.

37-43. -43. (canceled)