FR2783156A1 - Prosthetic harness for external iliac vessels - Google Patents

Abstract

The prosthetic harness has a domed panel (1) with a secondary cap section (6) at its lower edge. The outer edge (8) of the second section forms an apex (4) with the lower edge of the panel having an angle greater than one hundred degrees and adjustable to the inclination of the iliac vessels.

Description

GALBE PROSTHETIC NET FITTING TO VESSELS

EXTERNAL ILIACS

  In FR-B-2 709 947, a prosthetic net is described in an implantable, non-absorbable and flexible material and taking the curved shape of a cap by itself. The net comprises a first part in the form of a spherical cap at the lower edge of which a second part in the form of a spherical cap with a radius of curvature less than that of the first part is connected. The outer edge of the second part and the lower edge of the first part compete in a vertex which is the highest point of the curved net. This net has proven itself and has established itself in practice. The net is not subjected to stresses due to its deformation during laying and therefore does not tend to move. It strengthens the abdominal wall of the region

1 anatomical concerned.

  However, it has been observed that this strengthening of the abdominal wall

could be expanded.

  The invention aims to further improve the parietal reinforcement by enlarging the net, more particularly with regard to certain no anatomical zones, which also requires suitable positioning. This last characteristic is obtained by remodeling the net opposite anatomical elements. This is achieved, according to the invention, by the fact that the outer edge of the second part forms, at the top, with the lower edge of the first part, an angle greater than 100 and, preferably, an angle between 101 and . Thanks to this angular arrangement, the outer edge of the second

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  part comes substantially opposite the external iliac vessels which are inclined and the depression corresponding to the connection of the external edge of the second part with another adjacent part at best centers the net on the external iliac vessels so that it does not have tendency to move, while allowing a certain deformation to marry the adjacent reliefs. According to one embodiment, the net comprises a third part connecting to the external edge of the first part and a fourth part connecting to the lower edge of the third part and to the external edge of the second part, and there is no only four parts. We thus obtain a net which, all

  having a sufficient dimension, best matches the anatomical forms.

  For the net to have sufficient dimensions, it is better that the third part has a fairly large surface and in particular that the ratio of the surface of this third part to the total surface of the net is between

0.25 and 0.40.

  Preferably also, with a view to promoting manufacturing, the portion of the third part close to the external edge of the first part is substantially in the form of a spherical cap. When, moreover, this third part has, along the external edge of the first part, substantially the same radius of curvature as that of the first part, there is not created between the first and the third part a gathered which can, in certain case, make that the first and third parts of the net partially overlap one another on installation or after installation and that the dimension of the net does not

  more closely matches what is desired.

  In the accompanying drawings, given solely by way of example: Figure 1 is a plan view of a net according to the invention, Figure 2 is a sectional view along line 11-11 of Figure 1, and the Figure 3 is a sectional view along line 111-111 of the

_g0 figure 1.

  The net according to the invention is made of knitted fabric of implantable polypropylene thread (Meshs BARD); the stitches of the net have not been shown in the drawings. The curved shape is given by a thermoforming process, comprising a heating step (100 to 200 degrees Celsius during a

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  duration of 5 to 60 minutes) and a cooling step (air flow of a temperature between 15 and 30 degrees Celsius, for a duration of 5 to minutes) during which the net is kept in the mold designed to

product dimensions.

  The welded edges of the net are obtained by fusion of the meshes and the material, by a process of welding Ultra-sounds. In this process, the net is held between a vibration generating element and an anvil designed

product dimensions.

  Welding is carried out with a pressure between 150 and 800 KiloPascals, with an energy between 100 and 5000 Joules, during

  a duration between 50 and 5000 milliseconds.

  The net, thus curved and welded on its edges, is separated from the periphery

  remaining by manual cutting process.

  After inspection, the net is packaged in an internal packaging (hull and interlayer) designed specifically for the characteristics

  three-dimensional product to respect and protect this curved shape.

  This first package is placed and packaged in a second

  outer packaging. The whole is sterilized with ethylene oxide.

  The net comprises a first part 1, in the form of a spherical cap, 0 having an external edge 2 and a lower edge 3 which meet at the top 4 of the net which is its highest point. In the same plane as edges 2 and 3

  extends a circular internal edge 5 of part 1.

  A second part 6 has an upper edge 7 which coincides with the

  lower edge 3 of the first part, an outer edge 8 and a lower edge 9.

  The angle at the top 4 between edge 3 and edge 8 is 110.

  At the first part 1 is connected by the edge 2 a third part 10

  having a lower edge 11 and a circular outer edge 14.

  Below this third part 10 and adjacent to the second part 6, there is a fourth part 15 defined by the edges 8 and 11 thus

o0 only by a lower edge 16.

  The height of the net, i.e. the distance between the defined plane

  by the edges 5, 9, 14 and 16 and the vertex 4 is 21 mm.

  The first part 1 has substantially the shape of a spherical cap having a radius of curvature of 120 mm, in particular along the edge 2. The È,) third part 10 has substantially the same radius of curvature of 120 mm the

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  along edge 2. The total area of the cap is 44,780 mm2, while

  that of the third part 10 is 12,735 mm2.

  The second part 6 has the shape of a spherical cap having a radius of curvature of 35 mm and the fourth part also has the shape of a cap

  spherical with a radius of curvature of 35 mm.

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Claims (5)

  1 prosthetic mesh made of an implantable material which is not absorbable and flexible and which takes the curved shape of a cap by itself, comprising a first part (1) substantially in the form of a spherical cap at the lower edge (3) of which a second is connected part (6) substantially in the form of a spherical cap with a radius of curvature less than that of the first part, the external edge (8) of the second part (6) and the lower edge (3) of the first part (1) contributing in an apex (4), characterized in that the outer edge (8) of the second part (6) forms, at the apex (4),   with the lower edge (3) of the first part (1) an angle greater than 100.   2. Net according to claim 1, characterized in that the angle is between 101 and 120.   3. Net according to claim 1 or 2, characterized in that it comprises a third part (10) connecting to the outer edge (2) of the first part (1) and a fourth part (15) connecting to the lower edge (11) of the third part (10) and at the outer edge (8) of the second part (6) and there are only four parts.   4. Net according to claim 3, characterized in that the ratio of the surface of the third part to the total surface of the net is between 0.25 and 0.40.   5. Net according to claim 3 or 4, characterized in that at least the portion of the third part (10) close to the outer edge (2) of the first part (1) a, along the outer edge (2) , substantially the same radius   of curvature than that of the first part (1).