Ostial stent

• US 20050222672A1
• Filed: 03/31/2005
• Published: 10/06/2005
• Est. Priority Date: 04/01/2004
• Status: Abandoned Application

• Current Assignee: Cappella Inc. (ArraVasc Limited)
• Original Assignee: Cappella Inc. (ArraVasc Limited)
• Inventors: Shmulewitz, Ascher
• Application Number:
  US11/095,983
• Publication Number:
  US 20050222672A1
• Time in Patent Office: Days
• US Class Current: 623/1.150
• CPC Class Codes: A61F 2/88 the wire-like elements formed as helical or spiral coils forming a net-like or mesh-like structure A61F2/90
• CPC Class Codes: A61F 2002/821 Ostial stents
• CPC Class Codes: A61F 2230/005 Rosette-shaped, e.g. star-shaped
• CPC Class Codes: A61F 2250/0039 differing in diameter
• CPC Class Codes: A61F 2250/0067 Means for introducing or releasing pharmaceutical products into the body

Abstract

An intraluminal device for placement in a side-branch vessel associated with a main vessel via an ostial region. The intraluminal device includes a stem portion and a toroidal cap portion. The stem portion of the device is placed in the side branch vessel and the toroidal cap portion is placed adjacent to the ostial region.

Claims

1. An intraluminal stent comprising:

a stem portion, defining a lumen therethrough along a central axis, having a proximal end and a distal end and having proximal and distal openings, respectively; and

a cap portion, located at the distal end of the stem portion, the cap portion comprising a plurality of cap sections oriented substantially orthogonal to the central axis and positioned about the distal opening.

2. The stent of claim 1, wherein each of the stem portion and the cap portion is formed from a material having shape memory characteristics.

3. The stent of claim 1, wherein the cap portion is capable of being permanently deformed upon application of a force in a direction substantially parallel to the central axis.

4. The stent of claim 1, wherein each cap section of the cap portion has a circular cross-section.

5. The stent of claim 1, wherein an outer diameter of the stem portion is substantially unchanged along a length from the proximal end to the distal end.

6. The stent of claim 1, wherein an outer diameter of the stem portion varies along a length from the proximal end to the distal end.

7. The stent of claim 6 wherein the outer diameter varies monotonically from the proximal end to the distal end.

8. The stent of claim 1, wherein the stem portion comprises a substantially tubular structure.

9. The stent of claim 8, wherein the stem portion comprises a spring-like structure.

10. The stent of claim 9, wherein the cap portion comprises a substantially toroidal shape.

11. The stent of claim 10, further comprising:

a medicinal coating disposed on at least one of the cap portion and the stem portion.

12. The stent of claim 10, wherein the stem portion and the cap portion are formed from a material having shape memory characteristics.

13. The stent of claim 12, wherein the stem portion and the cap portion are formed from a single continuous piece of material.

14. A method of forming an intralumenal stent, the method comprising:

provided a substantially linear piece of material;

forming, from the material, a cylindrical stem portion, defining a lumen therethrough oriented along a central axis, the cylindrical stem portion having a proximal end and a distal end and proximal and distal openings, respectively; and

forming a cap portion at the distal end of the cylindrical stem portion, the cap portion comprising a plurality of cap sections oriented substantially orthogonal to the central axis and positioned about the distal opening.

15. The method of claim 14, further comprising:

choosing the material to be one having shape-memory characteristics.

16. The method of claim 14, further comprising:

coating at least one of the stem portion and the cap portion with a medicinal coating.

17. The method of claim 14, further comprising:

forming the cap portion as a toroid.

18. The method of claim 14, further comprising:

forming the stem portion to have a substantially constant outer diameter.

19. The method of claim 14, further comprising:

forming the stem portion to have an outer diameter that varies along a length from the proximal end to the distal end.

20. The method of claim 19, wherein the outer diameter varies monotonically from the proximal end to the distal end.

21. The method of claim 14, further comprising:

forming each cap section to have a circular cross-section.

22. The method of claim 21, further comprising:

forming the stem portion as a spring.

23. A method comprising:

providing an intraluminal stent having a stem portion and a cap portion;

positioning the intraluminal stent in a patient such that the stem portion is in a side branch vessel portion and the cap portion extends into a main vessel from the side branch vessel portion; and

compressing the cap portion against an ostial region of the main vessel adjacent the side branch vessel portion.

24. The method of claim 23, further comprising:

inflating a balloon catheter in the main vessel to compress the cap portion.

25. The method of claim 23, wherein positioning the stem portion in the side branch vessel comprises:

positioning the stem portion in the side branch vessel portion via an approach from the main vessel.

26. The method of claim 25, wherein positioning the stem portion in the side branch vessel further comprises:

releasing the stent from a delivery catheter, wherein the stem portion is released prior to the cap portion.

27. The method of claim 23, wherein the cap portion comprises:

a plurality of cap sections oriented substantially orthogonal to a central axis of the stem portion and positioned about a diameter of the stem portion.

28. The method of claim 27, wherein:

each cap section has a substantially circular cross-section; and

the plurality of cap sections is arranged as a toroid about the diameter of the stem portion.

29. The method of claim 28, wherein the stent is made from a material having shape-memory characteristics.

30. The method of claim 29, wherein at least one of the cap portion and the stem portion is coated with a medicinal coating.