Radial design for high strength, high flexibility, controlled recoil stent

• US 20060030928A1
• Filed: 08/04/2004
• Published: 02/09/2006
• Est. Priority Date: 08/04/2004
• Status: Abandoned Application

• Current Assignee: Cordis Corporation (Cardinal Health, Inc.)
• Original Assignee: Cordis Corporation (Cardinal Health, Inc.)
• Inventors: Burgermeister, Robert, Grishaber, Randy-David Burce
• Application Number:
  US10/911,265
• Publication Number:
  US 20060030928A1
• Time in Patent Office: Days
• US Class Current: 623/1.150
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2002/91533 characterised by the phase between adjacent bands
• CPC Class Codes: A61F 2210/0014 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2230/0013 Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
• CPC Class Codes: A61L 31/14 Materials characterised by their function or physical properties , e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials

Abstract

A biocompatible metallic material may be configured into any number of implantable medical devices including intraluminal stents. The biocompatible metallic material comprises a unique composition and designed-in properties that enable the fabrication of intraluminal stents that are able to withstand a broader range of loading conditions than currently available stents. More particularly, the microstructure designed into the biocompatible metallic material facilitates the design of stents with a wide range of geometries that are adaptable to various loading conditions.

Claims

1. An intraluminal stent comprising:

a plurality of hoop components being formed as a continuous series of substantially circumferentially oriented radial strut members and alternating radial arc members, wherein the continuous path from a midpoint of a radial strut member to an equivalent midpoint of an adjacent radial strut member through a radial arc member defines a single loop, and wherein a series of interconnected single loops comprise a single hoop component, wherein the number of circumferentially adjacent single loops are geometrically configured to substantially minimize crossing profile, and the total number of single loops define a total path-length, as measured along the centroidal axis of each radial strut and arc member, of the hoop component; and

,

one or more flexible connectors being formed as a continuous series of substantially longitudinally oriented flexible strut members and alternating flexible arc members, the one or more flexible connectors connecting adjacent hoop components to form a substantially tubular structure having a luminal surface and an abluminal surface, wherein a wall thickness is defined as the radial distance between the luminal surface and the abluminal surface of the substantially tubular structure, the single loop components are configured into a hoop component with a ratio of expanded circumferential distance to total path-length greater than about 0.25 and fabricated from a metallic material processed to have a microstructure, in at least the radial arc members, with a granularity of about 32 microns or less and comprise from about 2 to about 10 substantially equiaxed grains as measured across the wall thickness.

2. The intraluminal stent according to claim 1, wherein each radial strut member is configured to exhibit substantially no permanent plastic deformation upon expansion.

3. The intraluminal stent according to claim 2, wherein each radial arc member is configured to accommodate substantially all permanent plastic deformation upon expansion.

4. The intraluminal stent according to claim 3, wherein the ratio of a length of a loop to a length of the radial arc member within any single loop is greater than or equal to unity.

5. The intraluminal stent according to claim 1, wherein each radial arc member is configured to exhibit substantially no permanent plastic deformation upon expansion.

6. The intraluminal stent according to claim 5, wherein each radial strut member is configured to accommodate substantially all permanent plastic deformation upon expansion.

7. The intraluminal stent according to claim 6, wherein the ratio of a length of a loop to a length of the radial arc member within any single loop is greater than unity.

8. The intraluminal stent according to claim 1, wherein each radial arc member and each radial strut member are configured to accommodate permanent plastic deformation upon expansion.

9. The intraluminal stent according to claim 8, wherein the ratio of a length of a loop to a length of the radial arc member within any single loop is greater than unity.

10. An intraluminal stent for placement within a vessel comprising one or more support structures defining a predetermined path-length, wherein the ratio of vessel luminal perimeter to path-length is greater than about 0.25 and the one or more support structures being fabricated from a metallic material processed to have a microstructure with a granularity of about 32 microns or less and comprises from about 2 to about 10 substantially equiaxed grains as measured across the wall thickness.