Directionally controlled expandable device and methods for use

• US 20070010845A1
• Filed: 07/08/2005
• Published: 01/11/2007
• Est. Priority Date: 07/08/2005
• Status: Abandoned Application

• Current Assignee: Kyphon SARL (Medtronic Plc)
• Original Assignee: Kyphon SARL (Medtronic Plc)
• Inventors: Gong, Gorman, Malandain, Hugues, Edidin, Avram, Osorio, Reynaldo
• Application Number:
  US11/177,666
• Publication Number:
  US 20070010845A1
• Time in Patent Office: Days
• US Class Current: 606/192
• CPC Class Codes: A61B 17/8855 inflatable, e.g. kyphoplasty balloons
• CPC Class Codes: A61B 2017/00535 pneumatically or hydraulically operated A61B2017/22051, A61B2090/401 take precedence
• CPC Class Codes: A61B 90/39 Markers, e.g. radio-opaque or breast lesions markers
• CPC Class Codes: A61B 90/60 Supports for surgeons, e.g. chairs or hand supports seats for dentists or surgeons associated with dental chairs or operating chairs A61G15/00
• CPC Class Codes: A61F 2/44 for the spine, e.g. vertebrae, spinal discs
• CPC Class Codes: A61F 2/4601 for introducing bone substitute, for implanting bone graft implants or for compacting them in the bone cavity
• CPC Class Codes: A61F 2002/30014 differing in elasticity, stiffness or compressibility
• CPC Class Codes: A61F 2002/30581 having a pocket filled with fluid, e.g. liquid
• CPC Class Codes: A61F 2250/0018 differing in elasticity, stiffness or compressibility
• CPC Class Codes: A61M 2025/1059 having different inflatable sections mainly depending on the response to the inflation pressure, e.g. due to different material properties with different compartments A61M2025/1072
• CPC Class Codes: A61M 2025/1084 having features for increasing the shape stability, the reproducibility or for limiting expansion, e.g. containments, wrapped around fibres, yarns or strands
• CPC Class Codes: A61M 2025/1088 having special surface characteristics depending on material properties or added substances, e.g. for reducing friction
• CPC Class Codes: A61M 25/10 Balloon catheters A61M25/0125 takes precedence; embolectomy A61B17/22032; retractors A61B17/02; inflatable balloons for placing stents or stent-grafts A61F2/958 ; stomach balloons for treatment of obesity A61F5/0003; oesophagal tubes A61J15/00
• CPC Class Codes: A61M 25/1027 Making of balloon catheters

Abstract

Systems and methods for directionally controlling expansion of an expandable device are described. One such device includes an expandable body comprising a first wall portion and a second wall portion. The first wall portion comprises a high elasticity material. The second wall portion comprises a material having an elasticity lower than the elasticity of the first wall portion. When the body is expanded, expansion of the second wall portion is constrained more than expansion of the first wall portion. Expansion of the body is directed outwardly from the high elasticity first wall portion. Such a device is useful for providing cavities in interior body regions.

Claims

1. A device comprising:

an expandable body comprising a wall having a first wall portion comprising a high elasticity material and a second wall portion comprising a material having an elasticity lower than the first wall portion elasticity.

2. The device of claim 1,

wherein expansion of the second wall portion is constrained more than expansion of the first wall portion, and

wherein expansion of the body is directed outwardly from the first wall portion.

3. The device of claim 1,

wherein the expandable body comprises an elongated axis, and

wherein the second wall portion constrains expansion of the body lengthwise along the elongated axis.

4. The device of claim 1,

wherein the expandable body comprises an elongated axis, and

wherein the first wall portion and the second wall portion extend along the elongated axis.

5. The device of claim 1, wherein the expandable body wall comprises a plurality of the first wall portions and a plurality of the second wall portions.

6. The device of claim 1, wherein the high elasticity material comprises a low durometer material and the lower elasticity material comprises a high durometer material.

7. The device of claim 1, the expandable body further comprising an internal restraint coupled to the body for directing expansion of the body in opposite directions.

8. The device of claim 1, further comprising a substantially rigid surface adjacent the expandable body,

wherein the substantially rigid surface resists displacement during expansion of the body, and

wherein the body is expanded in one direction away from the substantially rigid surface.

9. The device of claim 1, wherein a thickness of the second wall portion is greater than a thickness of the first wall portion.

10. The device of claim 1, wherein the expandable body wall comprises a third wall portion comprising a material having an elasticity lower than the first wall portion elasticity and different than the second wall portion elasticity.

11. The device of claim 1, wherein the second wall portion extends through a full thickness of the body wall.

12. The device of claim 1, wherein the second wall portion extends through a partial thickness of the body wall.

13. The device of claim 1, wherein the expandable body wall comprises a non-circular cross-section.

14. The device of claim 1, wherein the expandable body comprises an inflatable balloon tube.

15. The device of claim 14, wherein the inflatable balloon tube comprises multiple lumens.

16. The device of claim 1, wherein the second wall portion comprises the lower elasticity material and a nanocomposite of the lower elasticity material.

17. The device of claim 16, wherein the nanocomposite comprises a nano-filler comprising a material other than the low elasticity material.

18. The device of claim 1, wherein the first wall portion comprises a radiopaque material.

19. The device of claim 1, wherein the first wall portion comprises a radiopaque material.

20. The device of claim 1,

wherein the expandable body wall comprises a substantially circular cross-section and an elongated axis,

wherein the body wall comprises the second wall portion on one side of the body wall cross-section, and

wherein when the body is expanded, the body curves at an angle from the elongated axis.

21. The device of claim 20, wherein the angle the body curves from the elongated axis is in the range of 30-90 degrees.

22. The device of claim 1,

wherein the expandable body wall comprises a substantially circular cross-section and an elongated axis,

wherein a thickness of the body wall on one side of the body wall cross-section is greater than a thickness of the body wall on an opposite side of the body wall cross-section, and

wherein when the body is expanded, the body curves at an angle from the elongated axis.

23. The device of claim 1,

wherein the expandable body wall comprises a substantially circular cross-section and an elongated axis,

wherein one side of the body wall cross-section comprises a non-compliant material, and

wherein when the body is expanded, the body curves at an angle from the elongated axis.

24. A system comprising:

a cannula comprising a cannula distal end;

an elongate member comprising an elongate member distal end; and

an expandable body coupled to the elongate member distal end and configured to be slidably disposed within the cannula, the expandable body comprising a wall having a first wall portion comprising a high elasticity material and a second wall portion comprising a material having an elasticity lower than the first wall portion elasticity.

25. The system of claim 24,

wherein expansion of the second wall portion is constrained more than expansion of the first wall portion, and

wherein expansion of the body is directed outwardly from the first wall portion.

26. The system of claim 24,

wherein the expandable body comprises an elongated axis, and

wherein the second wall portion constrains expansion of the body lengthwise along the elongated axis.

27. The system of claim 24,

wherein the expandable body comprises an elongated axis, and

wherein the first wall portion and the second wall portion extend along the elongated axis.

28. The system of claim 24, wherein the high elasticity material comprises a low durometer material and the lower elasticity material comprises a high durometer material.

29. The system of claim 24, wherein the second wall portion comprises the lower elasticity material and a nanocomposite of the lower elasticity material.

30. The system of claim 24, wherein the first wall portion comprises the high elasticity material and a first amount of a nanocomposite of the high elasticity material and

the second wall portion comprises the high elasticity material and a second amount of the nanocomposite of the high elasticity material,

wherein the second amount of the nanocomposite is larger than the first amount of the nanocomposite.

31. The system of claim 24, wherein the first wall portion comprises a radiopaque material.

32. A method comprising:

providing an expandable body comprising a wall having a first wall portion comprising a high elasticity material and a second wall portion comprising a material having an elasticity lower than the first wall portion elasticity.

33. The method of claim 32, wherein providing the expandable body comprises providing the high elasticity material comprising a low durometer material and the lower elasticity material comprising a high durometer material.

34. The method of claim 32, wherein the providing the expandable body further comprises coextruding the first wall portion and the second wall portion.

35. The method of claim 32,

wherein the expandable body comprises an elongated axis, and

wherein the first wall portion and the second wall portion are coextruded to extend along the elongated axis.

36. The method of claim 32, wherein the second wall portion comprises the lower elasticity material and a nanocomposite of the lower elasticity material.

37. The method of claim 32, wherein providing the expandable body comprises providing

the first wall portion comprising the high elasticity material and a first amount of a nanocomposite of the high elasticity material and

the second wall portion comprising the high elasticity material and a second amount of the nanocomposite of the high elasticity material,

wherein the second amount of the nanocomposite is larger than the first amount of the nanocomposite.

38. The method of claim 32, wherein the first wall portion comprises a radiopaque material.

39. A method comprising:

providing an expandable body coupled to a distal end of an elongate member, the expandable body comprising a wall having a first wall portion comprising a high elasticity material and a second wall portion comprising a material having an elasticity lower than the first wall portion elasticity;

introducing a cannula into an interior body region;

inserting the elongate member through the cannula such that the expandable body is positioned for expanding in a selected direction in the interior body region; and

causing directed expansion of the expandable body,

wherein the first wall portion expands in the selected direction.

40. The method of claim 39,

wherein the expandable body comprises an elongated axis, and

wherein causing directed expansion of the body causes the first wall portion to expand outwardly in the selected direction along the elongated axis.

41. The method of claim 39,

wherein the expandable body comprises an elongated axis, and

wherein causing directed expansion of the body causes the first wall portion to expand in a constrained manner lengthwise along the elongated axis.

42. The method of claim 39, wherein the directed expansion creates a cavity within the interior body region.

43. The method of claim 39, wherein the interior body region comprises a bone.

44. The method of claim 43, wherein the causing directed expansion of the body comprises compressing a cancellous bone within the bone.

45. The method of claim 43, wherein the directed expansion displaces a cortical bone.

46. The method of claim 43, wherein the directed expansion lifts vertebral end plates.

47. The method of claim 43, wherein the directed expansion lifts tibial plateau depressions.

48. The method of claim 43, wherein the directed expansion lifts proximal humerus depressions.