Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Axially compressible flared stents and apparatus and methods for delivering them

a stent and axial compression technology, applied in the field of stents, can solve problems such as improper deployment risks, and achieve the effects of enhancing the support of the ostium, sufficient stiffness, and reducing the risk of improper deploymen

Inactive Publication Date: 2007-03-08
INCEPT LLC
View PDF51 Cites 347 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] In accordance with one embodiment, a stent is provided that includes a tubular member including first and second ends defining a longitudinal axis therebetween and a plurality of cells disposed between the first and second ends. Generally, the stent includes a first end portion configured to flare outwardly when the stent is expanded from the contracted condition to an intermediate flared condition, and a second portion adjacent the first portion configured to expand when the stent is expanded from the flared condition to a fully deployed condition. The second portion may be connected to the first end portion by a plurality of flexible connectors, which may facilitate the first end portion flaring outwardly.
[0012] In one embodiment, the proximal portion may have a greater radial strength than the distal portion. In addition or alternatively, the distal portion may have a radial strength greater than the flaring portion. Thus, in an exemplary embodiment, the flaring portion may be more easily expandable than the main portion, and the proximal portion of the main portion may have the greatest radial strength of the stent, e.g., to facilitate maintaining an ostium dilated after implanting the stent.
[0020] Initially, the stent may be introduced into the main body lumen with the stent in a contracted condition, and positioned such that the first end portion is disposed adjacent the ostium and the second portion is disposed within the branch body lumen. The first end portion may be flared, thereby causing first struts of the first set of cells to move from a substantially axial orientation towards a radial and partial circumferential orientation and causing second struts of the second set of cells to move from a substantially axial orientation towards a radial orientation. Optionally, the stent may be further positioned, the flared first end portion facilitating positioning relative to the ostium. The stent may then be expanded such that the second portion expands within the branch body lumen, and the first and second struts move towards a more circumferential orientation, thereby securing the stent relative to the ostium.
[0021] In accordance with another embodiment, a method is provided for expanding a stent that includes providing a stent on one or more expandable members, the stent including first and second ends, a first portion and a second portion connected to the first flaring portion. An expandable member is expanded to flare the first portion, the second portion having sufficient stiffness to resist expansion when the first portion is flared. An expandable member is expanded to expand the second portion to an enlarged condition, thereby causing the first portion to expand further. In one embodiment, the second portion includes a distal main portion and a proximal main portion connecting the first portion to the distal main portion. The proximal main portion may include a stiffness, radial strength, and / or other characteristics such that the proximal main portion resists expansion when the first flaring portion is flared.
[0022] In accordance with yet another embodiment, a method is provided for delivering a stent within an ostium communicating between a main body lumen and a branch body lumen, the stent including a first flaring portion, and a second main portion including a distal main portion and a proximal main portion connecting the distal main portion to the first flaring portion. The stent is introduced into the main body lumen stent in a contracted condition. The first flaring portion is expanded to a flared configuration, e.g., by expanding a first expandable member. The proximal main portion, which may partially overly the first expandable member, may resist expansion when the first flaring portion is flared by the first expandable member. The stent is expanded further, e.g., by expanding a second expandable member, such that the second main portion expands within the branch body lumen, and the first flaring portion expands further adjacent the ostium. The proximal main portion may have a greater radial strength than the distal main portion, thereby providing enhanced support of the ostium than more distally within the branch body lumen.
[0026] For example, the main portion may be expanded within the branch body lumen, e.g., to dilate a stenosis or other lesion adjacent to or within the ostium and / or branch, and / or to anchor the main portion relative to the branch. The flaring portion may then be expanded further, e.g., to a second expanded size greater than the first expanded size, e.g., to enhance seating of the stent relative to the ostium. The main portion may foreshorten, e.g., when the main portion is expanded within the branch and / or when the flaring portion is expanded to the second expanded size. This axial compression of the main portion may enhance seating of the stent and / or may enhance support within lesion and / or ostium.

Problems solved by technology

FIGS. 1, 2, and 3 show attempts to deploy flared stents within various ostia having different shapes and / or sizes, and some of the risks of improper deployment.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Axially compressible flared stents and apparatus and methods for delivering them
  • Axially compressible flared stents and apparatus and methods for delivering them
  • Axially compressible flared stents and apparatus and methods for delivering them

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0069] Turning to the drawings, FIGS. 4-6 show exemplary embodiments of a stent 40 that includes a generally cylindrical tubular member including a proximal or first end 42 and a distal or second end 44 defining a longitudinal axis 46 therebetween. The stent 40 is generally radially expandable from a contracted or delivery condition (not shown), to a flared condition (e.g., as shown in FIGS. 5A, 6A, and 6C), and to an enlarged or fully deployed condition (e.g., as shown in FIGS. 5B, and 6B-6E). For example, the stent 40 may include a first end portion 41 at the first end 42 and a second portion 43 adjacent the first end portion 41, and a plurality of connectors 10 connecting the second portion 43 to the first end portion 41.

[0070] In an exemplary embodiment, the stent 40 may include a plurality of annular bands of cells 47-49 disposed between the proximal and distal ends 42, 44. Each band of cells 47-49 may be defined by a plurality of struts or other elements extending axially alo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A stent includes a flaring portion and a main portion connected to the flaring portion. The main portion includes a plurality of bands of cells spaced apart axially from one another, adjacent bands of cells being intermittently connected to one another. During use, the stent is introduced into a main vessel in a contracted condition and positioned with the flaring portion adjacent an ostium. The flaring portion is flared, and the stent is advanced at least partially into the ostium. The stent is expanded further such that the main portion expands within the branch body lumen and / or the flaring portion expands adjacent the ostium. The main portion compresses axially during at least one of the steps when the stent is expanded, which may enhance conformance of the stent relative to the ostium and / or enhance reinforcement of the ostium.

Description

[0001] This application claims benefit of provisional application Ser. Nos. 60 / 710,521, filed Aug. 22, 2005, 60 / 727,703, filed Oct. 17, 2005, 60 / 757,600, filed Jan. 9, 2006, 60 / 743,880, filed Mar. 28, 2006, and 60 / 745,177, filed Apr. 19, 2006, the entire disclosures of which are expressly incorporated by reference herein.FIELD OF THE INVENTION [0002] The present invention relates generally to endoluminal prostheses or “stents,” and, more particularly, to flared stents, and to apparatus and methods for delivering such stents into an ostium of a blood vessel or other body lumen. BACKGROUND [0003] Tubular endoprosthesis or “stents” have been suggested for dilating or otherwise treating stenoses, occlusions, and / or other lesions within a patient's vasculature or other body lumens. For example, a self-expanding stent may be maintained on a catheter in a contracted condition, e.g., by an overlying sheath or other constraint, and delivered into a target location, e.g., a stenosis within a ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): A61F2/06A61F2/82
CPCA61F2/91A61F2230/0067A61F2/958A61F2002/30322A61F2002/821A61F2002/91525A61F2002/91533A61F2002/91558A61F2250/0018A61F2250/0026A61F2250/0039A61M25/1002A61F2230/005A61F2230/0054A61F2/915
Inventor KROLIK, JEFFREY A.KIM, ELIOT
Owner INCEPT LLC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products