Stent for positioning at junction of bifurcated blood vessel and method of making

• US 5,893,887 A
• Filed: 10/14/1997
• Issued: 04/13/1999
• Est. Priority Date: 10/14/1997
• Status: Expired due to Term

• Current Assignee: Vascular Concepts Holdings Limited
• Original Assignee: Iowa-India Investments Company Limited
• Inventors: Jayaraman, Swaminathan
• Primary Examiner(s): Milano, Michael J.
• Application Number:
  US08/949,549
• Time in Patent Office: 546 Days
• Field of Search: 623/1, 623/11, 623/12
• US Class Current: 623/1.15
• 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 2/954 for placing stents or stent-grafts in a bifurcation
• CPC Class Codes: A61F 2002/065 Y-shaped blood vessels
• CPC Class Codes: A61F 2002/828 Means for connecting a plurality of stents allowing flexibility of the whole structure
• CPC Class Codes: A61F 2002/91508 the meander having a difference in amplitude along the band
• CPC Class Codes: A61F 2002/91525 within the whole structure different bands showing different meander characteristics, e.g. frequency or amplitude
• CPC Class Codes: A61F 2002/91533 characterised by the phase between adjacent bands
• CPC Class Codes: A61F 2002/9155 Adjacent bands being connected to each other
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2230/0008 elliptical or oval

Abstract

A stent has a generally cylindrical shape having a series of slots or other surface discontinuities facilitating adherence to the inner walls of a blood vessel. In one embodiment, one end of the stent has a terminus that is tapered at a non-orthogonal angle with respect to the axis of elongation of the stent. In other embodiments, both ends are angled non-orthogonally with respect to the longitudinal axis of the stent. The particular angle that each end surface of the stent makes with the longitudinal axis of the stent may be varied, in each case, to accommodate to bifurcated blood vessels of varying sizes, shapes and configurations. Use of stents in accordance with the teachings of the present invention precludes wall portions of a stent from protruding into a passage of a blood vessel in a manner that would cause restricted flow through the blood vessel. The method of making the stent in accordance with the teachings of the present invention is also disclosed.

Claims

1. A stent comprising:

(a) generally cylindrical body defining an axis of elongation and first and second end surfaces,

(b) at least a first, second and intermediate member,

(c) at least one set of varying length linkages comprising a pair of varying length linkages intermediately disposed between said first and second member,

(d) at least one of said end surfaces being angled obliquely and non-orthogonally with respect to said axis, and

(e) said intermediate member intermediately disposed between said pair of varying length linkages.

2. The stent of claim 1, wherein said first and second end surfaces are angled obliquely and non-orthogonally with respect to said axis.

3. A method of making a stent including the steps of:

a) providing a rectangular piece of material having first and second ends and opposed edges;

b) cutting a multiplicity of slots in the rectangular piece of material;

c) removing two corners of said piece at one of said ends;

d) rolling said piece into a cylindrical shape; and

e) attaching said opposed edges of said piece together.

4. The method of claim 3, wherein said one of said ends comprises said first end, and further including the step, before said rolling step, of removing two corners of said piece at said second end.

5. The method of claim 3, wherein said ends define end surfaces, and further including the step of coating said end surfaces with a radio-opaque material.

6. The method of claim 4, wherein said ends define end surfaces angling in opposed directions.

7. The method of claim 4, wherein said ends define end surfaces angling in a same direction.

8. A stent comprising,

(a) a generally cylindrical body defining an axis of elongation and first and second end surfaces,

(b) at least a first and second member,

(c) at least one set of varying length linkages intermediately disposed between the at least first and second members,

(d) at least one of the end surfaces being angled obliquely and non-orthogonally with respect to the axis of elongation and positioned at an area of bifurcation of a blood vessel so that the stent does not protrude into an adjacent blood vessel to interfere with smooth blood flow therethrough.