Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis
Patent
1994-04-21
1998-05-26
Milano, Michael J.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
A61F 206
Patent
active
057557691
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an expansible endoprosthesis for a human or animal tubular organ, of the type comprising an expansible mesh of cylindrical general shape, and is useful in particular for the endoluminal treatment of aneurisms and to dilations.
Endoprostheses of this type generally consist of a single metal mesh which can be expanded using a balloon, or are auto-expansible, i.e. self-expanding. After a transluminal dilation, they are inserted endoluminally using a probe, then expanded or released.
These known endoprostheses are not entirely satisfactory, because the tissues penetrate the cavities of the mesh and are traumatized and, in addition, the endoprosthesis creates turbulence in the blood flow.
Furthermore, these endoprostheses cannot be used for treating aneurisms, or more generally for connecting two healthy segments of a tubular organ such as a vessel, since they are not liquid-tight.
SUMMARY OF THE INVENTION
The object of the invention is to provide an expansible endoprosthesis which eliminates these draw-backs. For this purpose, the invention provides an endoprosthesis of the aforementioned type, but wherein a mesh is embedded in an extensible and biocompatible plastic or elastomer film, this film filling the cavities of the mesh and covering the entire surface of the mesh substantially throughout the whole extent of the endoprosthesis.
According to other characteristics: synthetic rubber; the end parts of the endoprosthesis are flared when it is in its expanded state; as polytetrafluoroethylene which has been made radiopaque.
Another aspect of the invention is a tool for fitting an auto-expansible endoprosthesis as defined above. This tool comprises: housing the endoprosthesis in the contracted state; and
According to one embodiment, such means comprise wires for cutting the tulip-shaped part into several petal-like parts, such wires being connected to an actuation handle.
According to another embodiment, such means comprise a longitudinal opening of the tulip-shaped part, each edge of which has a series of gussets, the gussets of the two edges being fitted into each other and being held by a cord which passes through them and which is connected to an actuation handle.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the invention will now be described with reference to the attached drawings, in which:
FIG. 1 diagrammatically represents an endoprosthesis according to the invention in a retracted state;
FIG. 2 diagrammatically represents the same endoprosthesis in an expanded state;
FIG. 3 represents, on a greatly enlarged scale, in perspective, a tool for fitting an auto-expansible endoprosthesis according to the invention;
FIG. 4 is a view in longitudinal section of the tool in FIG. 3;
FIG. 5 is a view taken in section along the line V--V in FIG. 4;
FIG. 6 illustrates the use of the tool in FIGS. 3 to 5;
FIG. 7 represents the corresponding expansion of the endoprosthesis;
FIG. 7A shows flaring of end portions; and
FIG. 8 diagrammatically represents, on a greatly enlarged scale and in perspective, another tool for fitting an auto-expansible endoprosthesis according to the invention.
DETAILED DESCRIPTION OF THE INVENTION
The endoprosthesis 1 represented in FIGS. 1 and 2 consists of a tubular mesh 2 embedded in a film 3.
The mesh consists of stainless steel of biocompatible grade. Mesh 2 can be made by weaving or knitting of a yarn, axial spreading of a tube, or by any other suitable technique. It is plastically deformable, that is to say that it has a first stable shape of small diameter, represented in FIG. 1, in which the cavities form diamonds elongated parallel to its axis, and a second stable shape of greatly enlarged diameter and shorter length, represented in FIG. 2, in which the cavities form diamonds elongated in the circumferential direction. Mesh 2 has an axis X (FIG. 2), opposite ends or end portions and a body or main portion extending between said end portions, as clearly illustrated. The material of mesh 2 has an exposed surfac
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Perouse Eric
Richard Thierry
Laboratoire Perouse Implant
Milano Michael J.
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