Expandable coil stent

• US 20060129233A1
• Filed: 02/07/2006
• Published: 06/15/2006
• Est. Priority Date: 03/28/2001
• Status: Active Grant

• Current Assignee: Stryker European Operations Holdings, LLC (Stryker Corporation)
• Original Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Inventors: Jansen, Lex P., Eder, Joseph C.
• Granted Patent: US 7,309,352 B2
• Time in Patent Office: Days
• US Class Current: 623/1.220
• 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 2220/005 using adhesives
• CPC Class Codes: A61F 2220/0058 soldered or brazed or welded
• CPC Class Codes: A61F 2250/0042 differing in shape-memory transition temperatures, e.g. in martensitic transition temperature, in austenitic transition temperature
• CPC Class Codes: A61F 2250/0048 differing in mechanical expandability, e.g. in mechanical, self- or balloon expandability

Abstract

An implantable coil stent comprises at least a first curved segment and a second curved segment which arc about the longitudinal axis of the stent. An expandable link extends between the second end of the first curved segment and the first end of the second curved segment.

Claims

1-31. -31. (canceled)

32. A coil stent, having an expanded state and an unexpanded state, the stent comprising a plurality of loops that substantially form a helix about a longitudinal axis, each loop of the plurality of loops extending 360 degrees about the longitudinal axis and having at least one arcing portion and at least one serpentine portion, serpentine portions being separated by an arcing portion which extends about the longitudinal axis such that every pair of circumferentially offset points within each arcing portion are substantially offset longitudinally.

33. The coil stent of claim 32 wherein the serpentine portions have at least two bends therein.

34. The coil stent of claim 32 wherein the serpentine portions on each loop are separated from one another by at least 90 degrees about the longitudinal axis.

35. The coil stent of claim 32 wherein the serpentine portions on each loop are separated from one another by at least 180 degrees about the longitudinal axis.

36. The coil stent of claim 32 wherein the serpentine portions are made of a different material than the arcing portions.

37. The coil stent of claim 32 wherein the serpentine portions are made of stainless steel and the arcing portions are made of nitinol.

38. The coil stent of claim 32 wherein the plurality of loops includes serpentine portions that are circumferentially aligned and longitudinally offset from one another.

39. The coil stent of claim 32 having the substantially same curvature about the longitudinal axis along the entire length of the plurality of loops.

40. The coil stent of claim 32 wherein the stent tapers from a larger diameter at a proximal end of the stent to a smaller diameter at a distal end of the stent.

41. The coil stent of claim 32 wherein expansion of the serpentine portions at least doubles the diameter of the stent from the unexpanded state to an expanded state.

42. A coil stent comprising a plurality of loops that substantially form a helix about a longitudinal axis, each loop of the plurality of loops extending 360 degrees about the longitudinal axis and having a plurality of arcing portions and a plurality of serpentine portions, serpentine portions on each loop being separated from one another by at least 180 degrees about the longitudinal axis.

43. A coil stent having a plurality of loops, each loop of the plurality of loops having at least one arcing portion and at least one serpentine portion, serpentine portions being separated by an arcing portion, the arcing portion extending about the longitudinal axis such that substantially all parts of the arcing portion are both circumferentially offset and longitudinally offset from one another.

44. The coil stent of claim 43 wherein the serpentine portions on each loop are separated from one another by at least 90 degrees about the longitudinal axis.

45. The coil stent of claim 43 wherein the serpentine portions on each loop are separated from one another by at least 180 degrees about the longitudinal axis.

46. The coil stent of claim 43 wherein the serpentine portions have been subjected to a different treatment than the arcing portions.

47. The coil stent of claim 43 wherein the serpentine portions are made of stainless steel and the arcing portions are made of nitinol.

48. The coil stent of claim 43 wherein the plurality of loops includes serpentine portions that are circumferentially aligned and longitudinally offset from one another.

49. The coil stent of claim 43 having the substantially same curvature about the longitudinal axis along the entire length of the plurality of loops.

50. The coil stent of claim 43 wherein the stent tapers from a larger diameter at a proximal end of the stent to a smaller diameter at a distal end of the stent.

51. The coil stent of claim 43 wherein expansion of the serpentine portions at least doubles the diameter of the stent from the unexpanded state to an expanded state.