Radiopaque stent

• US 5,725,572 A
• Filed: 08/08/1997
• Issued: 03/10/1998
• Est. Priority Date: 04/25/1994
• Status: Expired due to Term

• Current Assignee: Advanced Cardiovascular Systems Incorporated (Abbott Laboratories)
• Original Assignee: Advanced Cardiovascular Systems Incorporated (Abbott Laboratories)
• Inventors: Khosravi, Farhad, Frantzen, John J., Lam, Sharon S.
• Primary Examiner(s): Prebilic, Paul B.
• Application Number:
  US08/908,906
• Time in Patent Office: 214 Days
• Field of Search: 623/1, 623/12, 606/191, 606/194, 606/198, 600/3
• US Class Current: 623/1.16
• CPC Class Codes: A61B 90/39 Markers, e.g. radio-opaque or breast lesions markers
• 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 2002/91508 the meander having a difference in amplitude along the band
• CPC Class Codes: A61F 2002/91516 the meander having a change in frequency along the band
• CPC Class Codes: A61F 2002/91533 characterised by the phase between adjacent bands
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2002/91575 connected peak to trough
• CPC Class Codes: A61F 2230/0013 Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
• CPC Class Codes: A61F 2250/0098 radio-opaque, e.g. radio-opaque markers

Abstract

A radiopaque marker associated with a stent which is adapted to be implanted into a patient'"'"'s body lumen to maintain the patency thereof and a convenient and accurate method for affixing the radiopaque marker to the stent. The radiopaque marker defining an acceptable profile and capable of facilitating, under fluoroscopy, the identification of the position, diameter and length of a stent without obscuring the lesion being repaired and without impeding the deformation of an expandable stent.

Claims

1. A longitudinally flexible stent having high visibility under fluoroscopy for permanently implanting in a body lumen, comprising:

a plurality of cylindrical elements which are interconnected so as to be generally aligned on a common longitudinal axis;

at least one connecting element for interconnecting the cylindrical elements, the at least one connecting element configured to interconnect only the cylindrical elements that are adjacent to each other;

the plurality of cylindrical elements formed into a serpentine pattern including a plurality of peaks and valleys;

the stent further being constructed of deforming components that undergo deformation upon expansion of the stent and components that remain undeformed upon expansion of the stent; and

a radiopaque material exclusively affixed to portions of the undeformed components at least at the distal end and the proximal end of the intravascular stent so that the radiopaque material is visible under fluoroscopy and the distal stent end and the proximal stent end can be easily located in the body lumen where the stent is implanted.

2. The stent of claim 1, wherein the plurality of peaks and valleys comprise curved portions separated by straight segments which extend between the curved portions, the radiopaque material being affixed to the straight segments which comprise the undeformed components when the stent is expanded.

3. The stent of claim 1, wherein the radiopaque material comprises a metal selected from the group of metals consisting of gold, platinum and silver.

4. The stent of claim 1, wherein the radiopaque material has a thickness in the range of approximately of 0.0003 to 0.003 inch.

5. The stent of claim 1, wherein the radiopaque material is attached to all undeformed components of the distal end and the proximal end of the stent.

6. The stent of claim 1, wherein the radiopaque material forms a pattern.

7. The stent of claim 6, wherein the pattern comprises a wave shape.

8. A longitudinally flexible stent having high visibility under fluoroscopy for permanently implanting in a body lumen, comprising:

a plurality of cylindrical elements which are interconnected so as to be generally aligned on a common longitudinal axis;

at least one connecting element for interconnecting the cylindrical elements, the at least one connecting element configured to interconnect only the cylindrical elements that are adjacent to each other;

the plurality of cylindrical elements formed into a serpentine pattern including a plurality of peaks and valleys;

the stent further being constructed of deforming components that undergo deformation upon expansion of the stent and components that remain undeformed upon expansion of the stent; and

a radiopaque material affixed exclusively to the undeformed components of the cylindrical elements so that the radiopaque material is visible under fluoroscopy and the stent can be easily located in the body lumen.

9. The stent of claim 8, wherein the radiopaque material comprises a metal selected from the group of metals consisting of gold, platinum and silver.

10. The stent of claim 8, wherein the radiopaque material has a thickness in the range of approximately 0.0003 to 0.003 inch.