Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis
Patent
1997-06-25
1999-07-06
Prebilic, Paul B.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
600 37, 606151, 606153, A61F 202
Patent
active
059192321
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a prosthetic fabric, which can be used especially as an implantable parietal prosthesis in a human being, for example for a laparoscopic herniorrhaphy, via an extraperitoneal route.
In accordance with document WO-A-92 06639, a prosthetic fabric has been described which comprises:
a sheet with a textile structure, consisting of an interlacing or interweaving of wrap and weft threads, defining between them meshes which may possibly be blocked, the density of which is chosen in order to obtain an airy textile structure; the sheet, having a quadrangular general shape, is capable of adopting two different conformations, one being a compact conformation suitable for passing through a trocar, in which conformation the various parts of the sheet are gathered together into a form other than substantially plane, especially tubular, and the other being a deployed conformation, in which the same parts of the sheet open out substantially flat;
a continuous filiform element, joined onto the textile structure of the sheet while at the same time remaining free with respect to the latter, describing, when flat, a continuous line in the form of a loop, extending along the two dimensions of the sheet, being held on the latter in a plurality of catching points distributed along said continuous line.
The filiform element of WO-A-92 06639 constitutes in fact a reinforcement of the sheet, being at a same time rigid and flexible, although free with respect to the latter. This reinforcement makes it possible to direct the movements and orientation of the sheet, but not its change into the compact conformation (cf. FIG. 7), which requires an external action.
Moreover, the problem of the sheet as described in this document is that the folding is preformed irregularly, by the external action of withdrawing the loop through the insertion tubing. In this case, the loop takes the form of a drop or a tear, which means that the fabric is not folded in an ordered manner. This causes problems when it is freed in the extraperitoneal space, since it does not unfolding a uniform manner either, requiring additional positioning movement on the part of the surgeon, using the semi-rigid loop to direct the sheet to the correct place; this increases the risks of rupturing the peritoneum and of perforating the organs.
Other documents, especially document GB-A-2,200,379 and documents U.S. Pat. No. 3,791,436, in the field of domestic textiles, especially textiles for furnishing, describe various ways of folding fabrics to confer on them merely a particular decorative effect.
Those skilled in the art of prosthetic fabrics, and skilled in the surgical and medical art, would fail to identify and find in the field of ordinary textiles useful solutions in the field of surgical prostheses.
The object of the present invention is to improve a prosthetic fabric as described in document WO-A-92 06639, and more particularly to make it easier to change in an ordered manner from the deployed conformation to the compact conformation of the sheet with a textile structure.
In accordance with the present invention, the catching points holding the filiform element onto the sheet are distributed over the surface of the latter, along and on either side of a neutral axis, parallel to one of the principal dimensions of said sheet, so that any pulling of said filiform element via a free gripping end, with said element sliding with respect to the conformationally free sheet, generates positively an ordered folded arrangement of said sheet, in its compact conformation, transversely and on either side of said neutral axis.
In fact, one of the advantages of the prosthetic fabric according to the present invention is that it allows order gathering of the sheet which, in its compact conformation, is subsequently inserted easily into a trocar or inserting tube. Furthermore, the specific folded arrangements of the sheet make it easier to position it, for example in the extraperitoneal space, since the surgeon has only to withdraw the gathering thread
REFERENCES:
patent: 3791436 (1974-02-01), Weckbrodt
patent: 4854316 (1989-08-01), Davis
patent: 5150706 (1992-09-01), Cox et al.
patent: 5697978 (1997-12-01), Sgro
A. Manuila et al., "Dictionaire Francais De Medecine et de Biologie" 1972, Masson et Cie, Paris, France, 4 pages.
Chaffringeon Bernard
Sgro Jean-Claude
Cogent
Prebilic Paul B.
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