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Self-expanding stent for a medical device to be introduced into a cavity of a body
| Details |
Inventors: Frid, Noureddine;
Assignee: Corvita Corporation (Miami, FL)
Primary Examiner: Milano; Michael J.
Assistant Examiner:
Attorney, Agent or Firm: Gordon; David P.
A self-expanding stent is provided for introduction into a cavity of a human body. The stent has a tubular body which is radially expansible and axially retractable between a working state and a resting state. The tubular body has first and second plaited filaments which provide a middle portion of a first diameter and two flared end portions of increasingly larger diameter as they extend away from the middle portion. Each flared end portion has an axial length along a longitudinal axis of the stent which is greater than an axial length of the portion of minimal diameter. Preferably, the middle portion is a single location, with the diameter of the stent increasing in both directions from that location to the ends of the stent. Different shaped stents are disclosed, including stents having generatrices taking the form of line segments angled relative to the longitudinal axis, and generatrices taking the form of a hyperbola segment or a circle arc segment. |
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DETAILED DESCRIPTION In order to solve the problems raised herein above, a self-expanding stent is provided according to a first embodiment of the present invention, where the tubular body assumes substantially the form of a hyperboloid in the resting state; i.
e.
, the tubular body can be defined by a generatrix in the form of a hyperbola rotated about the longitudinal axis of the stent.
In other words, the stent has two flared ends of large diameter which extend from a center portion or location of smaller diameter.
Preferably, the hyperboloid-shaped stent is arranged such that the diameter of the cross section of the stent decreases continuously from the ends to the point of smallest diameter.
By virtue of this substantially hyperboloid arrangement, the stent opposes any ballooning inside an aneurysm while retaining its good properties of attachment by its flared ends on release in a tubular cavity of a human or animal body.
This is still true if the surgeon has reduced a part of the length of the stent by cutting, as the new end formed still remains flared with respect to the rest of the stent.
Finally, the radial expansion of the flared parts of the stent is maintained on release, and the flared parts, by conforming well to the shapes of the vascular walls in which they are released, efficiently prevent migration of the stent along these walls.
Different braiding or weaving arrangements of the filaments of the substantially hyperboloid stent can be utilized.
In one embodiment, a first filament will, when crossing over with a second filament, pass above the latter and, during the subsequent cross-over, pass below the second filament then crossed, and so on.
In another embodiment, the first filament passes above a second filament during two or more successive cross-overs and will then only pass below a second filament after this plurality of successive cross-overs, and so on.
Mixed plaited arrangements may also be provided.
The plaited structures according to the invention may be formed completely by monofilaments, as in the prior art
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