Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Arterial prosthesis – Stent structure
Reexamination Certificate
1998-11-18
2001-03-13
Prebilic, Paul B. (Department: 3738)
Prosthesis (i.e., artificial body members), parts thereof, or ai
Arterial prosthesis
Stent structure
C623S023700, C623S001170, C606S198000
Reexamination Certificate
active
06200337
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an implanting stent useful in the treatment of any stricture in a body passageway such as blood vessel, bile duct, trachea, esophagus, and ureter.
2. Prior Art
Stents are generally tubular shaped devices which function to maintain open a segment of a blood vessel or other anatomical lumen. They are useful in the treatment of stenosis in blood vessels or other narrowed passageways.
In terms of their function and implantation, stents are generally classified into self-expandable stents and balloon expandable stents. The balloon expandable stent which itself has no expanding function is secured at a desired intralumenal location by mounting the stent on a balloon, delivering the stent to the desired location, and inflating the balloon so that the stent is expanded through plastic deformation by the dilating force of the balloon until it comes in close contact with the inner surface of the desired location. Stents of this type require the operation of expanding the stent as mentioned above.
With respect to balloon expandable stents, reference is made to Palmaz, U.S. Pat. Nos. 4,733,665 and 4,776,337 and Schatz, U.S. Pat. No. 5,195,984, which are incorporated herein by reference. These stents are pipes having axial slots formed therein. The slots are arranged such that they may take inter-connected rhombus shapes when the stent is expanded.
The expandable intralumenal graft or stent of U.S. Pat. Nos. 4,733,665 and 4,776,337 is improved in shape retention after expansion because slots take interconnected rhombus shapes. That is, the stent is resistant to the contracting force of a blood vessel. Another advantage is that when it is desired to partially enlarge the expanded diameter, an additional balloon corresponding to the enlarged diameter may be inserted inside the stent. Since the stent in an unexpanded state is a pipe having axial slots formed therein as viewed in side elevation, the stent lacks flexibility in an axial direction so that when the stent is to be inserted to the lesion, it is sometimes difficult to deliver the stent along a winding blood vessel. Additionally, when expanded, the stent is substantially reduced in overall length, leaving possibilities that the stenosis in a blood vessel is not dilated over its entirety and that the actual position of the stent is offset from the intended location under radiographic observation. In either case, effective treatment of stenosis is not expectable.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a stent which is improved in shape retention after expansion, smoothly passed through a winding passageway, and maintains its overall length substantially unchanged after expansion. Another object of the present invention is to provide such a stent which can dilate a stenosis in a blood vessel over its entirety and be accurately positioned at the desired location so that the stent is effective for the treatment of stenosis.
According to the invention, there is provided an implanting stent in the form of a generally tubular member having an axis and having a diameter allowing for insertion into a body passageway and radially expandable upon application of a radially outward extending force from the interior of the tubular member. The stent is constructed as a series of annular units arranged in an axial direction of the stent. Each annular unit includes a plurality of generally ellipsoidal or polygonal elements or cell members arranged so as to surround the stent axis, the elements being elongate in an axial direction of the stent and having a center opening, and a corresponding plurality of tie members each connecting circumferentially opposed ends of adjacent elements. Adjacent annular units are interconnected at their tie members by at least one connecting member.
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Asaka Toshinari
Moriuchi Yousuke
Nobuyoshi Masakiyo
Burns Doane , Swecker, Mathis LLP
Prebilic Paul B.
Terumo Kabushiki Kaisha
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