Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Arterial prosthesis
Reexamination Certificate
1998-11-25
2001-10-09
Mancene, Gene (Department: 3731)
Prosthesis (i.e., artificial body members), parts thereof, or ai
Arterial prosthesis
C623S001350
Reexamination Certificate
active
06299634
ABSTRACT:
FIELD OF THE INVENTION
This invention features vascular prostheses designed to treat aortic aneurisms via the endoluminal route. The endovascular prostheses currently proposed are designed, in a first embodiment, for repairs, by means of a straight prosthetic tube attached at either end by an endoprosthesis. In another known embodiment, the repair is achieved by means of an aortic bifurcation whose form is similar to that of the anatomical layout.
BACKGROUND
In the prior art, an expanding prosthesis is also known, described in the French patent FR2678508. This document describes a device for reinforcing vessels in the human body, of the type which has an extended strengthener which runs along the inside of the vessel to be reinforced. In the invention, in order to allow unbroken junctions to be formed especially at the bifurcations, at least two devices are used with self-locking spirals which allow unbroken junctions to be created.
Another document of the prior art, published under the number EP508473 describes a bifurcated endovascular prosthesis, formed by a main branch and flexible sub-branches. The drawback with this type of prosthesis which is the closest state of the art is that to make surgical implantation possible, numerous models are required to suit the diameters and lengths of the aorta and the iliac arteries.
SUMMARY OF THE INVENTION
The purpose of this invention is to overcome these drawbacks and to offer a prosthesis whereby one model can be adapted to suit a wide range of vascular sections. Another objective is to offer a prosthesis which can be surgically implanted rapidly, in order to reduce the length and cost of the operation.
To this end, the invention features first of all a bifurcated vascular prosthesis, formed by a tubular main branch and extended by means of two tubular sub-branches, characterised in that at least one part of the main branch has expandable strengtheners.
The main branch will preferably be made from an expandable material, such as PTFE, reinforced by an expandable annular section.
The inlet of the main branch is advantageously formed of a stripped reinforced tubular section wherein a part of the expandable material (PTFE) has been stripped away to reveal the reinforcing material. This stripped section provides better adherence for the prosthesis.
In a first embodiment, the sub-branches are free and not reinforced. The main branch is advantageously expandable up to a diameter of around 28 mm, and the sub-branches are conically shaped, the end of which measures approximately 10 mm in diameter.
In a second embodiment, the main branch is extended by means of two reinforced sub-branches which are expandable up to a diameter of 10 mm, the expandable zones being offset longitudinally, and the sub-branches being of different lengths in order to avoid the reinforced zones overlapping.
Advantageously in both embodiments, the sub-branches are each extended by means of expandable reinforced annular sections, the length of which can be adjusted to suit the distal attachment to the iliac arteries.
REFERENCES:
patent: 5824040 (1998-10-01), Cox et al.
patent: 0 646 365 A (1995-05-01), None
patent: 0 686 379 A2 (1995-12-01), None
patent: 2 722 678 (1996-01-01), None
patent: 2722678 (1996-01-01), None
patent: WO 95/21592 (1995-08-01), None
patent: WO95/21592 (1996-01-01), None
patent: WO 96/24306 (1996-08-01), None
Mancene Gene
Robert Eduardo C.
Schnader Harrison Segal & Lewis LLP
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