Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Arterial prosthesis – Stent combined with surgical delivery system
Patent
1998-09-23
2000-12-19
Willse, David H.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Arterial prosthesis
Stent combined with surgical delivery system
623 115, 623 144, 623 122, A61F 206
Patent
active
061622443
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a stent for the splinting and/or holding-open of a body cavity, in particular, an organ cavity.
DE 176 69 21 describes a stent configuration for the splinting and holding-open of a body cavity. The conventional configuration has a tubular self-expanding network made from a plurality of mutually woven filaments. In accordance with an embodiment of DE 176 6921, the stent is configured as a reinforced tube, wherein the network is firmly embedded within the tube. In the event that the tube is fashioned from a material which is gentle to tissue, for example made from a plastic, a stent device which is suitable for splinting or holding-open of an organ cavity results. Since the network is completely embedded within the walls of the tube, the outer surface of the tube is smooth and therefore gentle to tissue if the tube is made from a material which is likewise gentle to tissue. However, the tube can become displaced relative to a predetermined position within the organ cavity.
In contrast thereto, it is the purpose of the present invention to present a stent of the above mentioned kind which is economical to produce and which facilitates a secure location within an organ cavity or body cavity, which is gentle to tissue, and which facilitates a permanent and stable positioning.
SUMMARY OF THE INVENTION
This purpose is achieved with a stent having a tube made from elastic material, a tubular weave made from filaments firmly seating on the outer surface of the tube, and a coating covering both the weave as well as the outer surface of the tube and holding the weave on the outer surface of the tube, the coating having a structured outer surface dominated by the weave, wherein the diameter of the filaments forming the weave is larger than the thickness of the coating.
The formation of the stent in accordance with the invention as a composite product among three components having an inner tube, a tubular weave securely seated thereon and a coating disposed on the outer surface of the tube guarantees the production of a stent which is not only economical to manufacture but also facilitates a gentle and secure location within e.g. an organ cavity. The outer coating serves for fixing the weave on the outer surface of the tube, wherein the restoring forces (expansion of the stent from an elongated tensioned stent having a smaller diameter into a state of the stent having a larger diameter and therefore an enlarged lumen) is determined by the cooperation between the elastic properties of the tube and the weave. The coating is configured in such a fashion that a structured outer surface of the stent results which is dominated by the structure of the weave. In this manner, in contrast to the conventional stent, the stent in accordance with the invention has a structured surface which guarantees a secure holding within the body cavity. The choice of material for the stent, in particular material of the weave, can be used to adjust the restoring forces of the stent. In this manner, a more economical stent is produced which nevertheless guarantees secure location within the body cavity. The coating is kept sufficiently thin so that the structure of the filaments leads to a corrugated surface for the stent in individual areal sections. This structured surface improves secure location and holding of the stent permanently in position within the body cavity.
Further advantages result when the weave is self-expanding. In this manner, the restoring forces of the stent can also be adjusted through choice of a suitable weave and do not only result from the material properties of the tube.
In a preferred embodiment of the invention, the filaments have a round cross section. This measure has the advantage that conventional wire material can be used as filaments forming a weave. In addition, the simple structuring caused by a filament having a rounded cross section is sufficient to give a stent a prominent surface structure.
It is advantageous when the filament comprises polyester, ke
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Bolliger Christoph
Braun Michael
Freitag Lutz
Klepetko Walter
Singvogel Armin
Jackson Suzette J.
Vincent Paul
Willse David H.
Willy Ruesch AG
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