Recapturable stent with minimum crossing profile

• US 7,473,272 B2
• Filed: 08/17/2005
• Issued: 01/06/2009
• Est. Priority Date: 08/17/2005
• Status: Expired due to Fees

• Current Assignee: Medtronic Vascular, Inc. (Medtronic Plc)
• Original Assignee: Medtronic Vascular, Inc. (Medtronic Plc)
• Inventors: Pryor, Jack
• Primary Examiner(s): Sweet; Thomas J
• Assistant Examiner(s): Stroud; Jonathan R
• Application Number:
  US11/207,170
• Publication Number:
  US 20070043424A1
• Time in Patent Office: 1,238 Days
• Field of Search: 623/1.2, 623/1.12, 623/1.16, 623/1.3
• US Class Current: 623/1.12
• 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 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/966 with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
• CPC Class Codes: A61F 2002/91516 the meander having a change in frequency along the band
• CPC Class Codes: A61F 2002/91541 Adjacent bands are arranged out of phase
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2002/9528 for retrieval of stents
• CPC Class Codes: A61F 2230/0013 Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped

Abstract

A self-expanding stent includes a plurality of segments having an alternating repeating pattern; each of the segments having connected crowns and unconnected crowns, wherein the unconnected crowns can be fully straightened without damage or permanent distortion to the unconnected crowns; and connectors extending between and connecting adjacent connected crowns of adjacent segments. The self-expanding stent catheter has a minimum crossing profile and the stent compressed for deployment therein is recapturable.

Claims

1. A method comprising:

stretching a self-expanding stent along a longitudinal axis of said self-expanding stent by pulling an end of said self-expanding stent along said longitudinal axis, wherein prior to said stretching, said self-expanding stent comprises;

a plurality of segments having an alternating repeating pattern;

each of said segments having connected crowns and unconnected crowns, wherein each cell of said self-expanding stent comprises two opposing unconnected crowns between adjacent connected crowns, said unconnected crowns comprising smooth curves;

connectors extending between and connecting adjacent connected crowns of adjacent segments;

said stretching comprising straightening said unconnected crowns such that said segments include straight sections between said adjacent connected crowns, said method further comprising allowing said unconnected crowns to return to said smooth curves such that said plurality of segments return to said alternating repeating pattern subsequent to said stretching.

2. The method of claim 1 wherein said straightening said unconnected crowns comprises causing said unconnected crowns to extend into a straight position.

3. The method of claim 1 wherein said unconnected crowns are straightened without damage or permanent distortion to said unconnected crowns.

4. The method of claim 1 wherein said stretching is performed until said self-expanding stent is nearly fully stretched along said longitudinal axis.

5. The method of claim 1 wherein said straight sections are approximately parallel to said longitudinal axis.

6. The method as claim 1 wherein each of said straight sections when relaxed comprises at least one straightened unconnected crowns.

7. The method of claim 1 wherein each of said straight sections when relaxed comprises two straightened unconnected crowns.

8. A method comprising:

inserting a stent delivery system into a vessel, said stent delivery system comprising;

a nearly fully stretched self-expanding stent comprising;

a plurality of segments;

each of said segments comprising connected crowns and straight sections extending between adjacent ones of said connected crowns, said straight sections when relaxed comprising unconnected crowns that have been straightened;

connectors extending between and connecting adjacent connected crowns of adjacent segments;

wherein prior to said self-expanding stent being nearly fully stretched by pulling an end of said self-expanding stent along said longitudinal axis, said self-expanding stent comprises;

said plurality of segments having an alternating repeating pattern;

each of said segments having said connected crowns and said unconnected crowns, wherein each cell of said self-expanding stent comprises two opposing unconnected crowns between adjacent connected crowns, said unconnected crowns comprising smooth curves;

a sheath radially constraining said nearly fully stretched self-expanding stent; and

retracting said sheath to expose at least a first segment of said stent, said first segment of said stent self-curling and radially self-expanding to return to said alternating repeating pattern.

9. The method of claim 8 wherein said self-curling comprises returning said unconnected crowns to a smooth curve relaxed configuration.

10. The method of claim 9 wherein said returning said unconnected crowns to a smooth curve relaxed configuration comprises returning said straight sections to a curved relaxed configuration.

11. The method of claim 8 further comprising advancing said sheath to recapture said stent.

12. The method of claim 11 wherein said advancing said sheath comprises pulling said stent straight and into said sheath.

13. The method of claim 12 wherein said stent has an absence of loose ends or other protrusions that can catch on a distal end of said sheath.

14. The method of claim 12 wherein said pulling said stent straight comprises straightening said unconnected crowns.