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FR2730156A1 - Inter-spinal wedge implant useful esp. for vertebral prosthesis - Google Patents

Inter-spinal wedge implant useful esp. for vertebral prosthesis
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Publication number
FR2730156A1
FR2730156A1FR9501519AFR9501519AFR2730156A1FR 2730156 A1FR2730156 A1FR 2730156A1FR 9501519 AFR9501519 AFR 9501519AFR 9501519 AFR9501519 AFR 9501519AFR 2730156 A1FR2730156 A1FR 2730156A1
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curvilinear
face
wedge according
convex
strip
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FR9501519A
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French (fr)
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FR2730156B1 (en
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William Houard
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Textile Hi Tec
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Textile Hi Tec
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Abstract

The implant comprises: (a) a central core (3) of a visco-elastic material with channels for the passage of ligaments, and (b) upper and lower thin metal plates (2,4) which are identical in shape to the upper and lower surfaces of the core, to which they are fitted. The implant is surrounded by a woven or knitted strip (5) of a textile material.

Description

Translated fromFrench

CALE INTER-EPINEUSE
La présente invention est relative à une amélioration apportée aux cales inter-épineuses rentrant dans la constitution de prothèses vertébrales.
INTER-SPINOUS HOLDER
The present invention relates to an improvement made to the interspinous wedges used in the formation of vertebral prostheses.

Le domaine technique de l'invention est celui de la fabrication de prothèses vertébrales. The technical field of the invention is that of the manufacture of vertebral prostheses.

La demande de brevet FR-A-2 693 364 (VOYDEVILLE) décrit une prothèse inter-vertébrale permettant une stabilisation des contraintes rotatoires et de flexion-extension. Patent application FR-A-2 693 364 (VOYDEVILLE) describes an intervertebral prosthesis allowing stabilization of the rotational and flexion-extension stresses.

La prothèse décrite dans ce document comporte un ligament souple comportant une première partie mince et une seconde partie large pour permettre un laçage en "8" autour des épineuses de deux vertèbres contiguës et pour effectuer un cerclage péri-épineux ; la prothèse comporte une cale inter-épineuse semi-souple percée de deux paires de canaux traversant, adaptées pour le passage des deux parties respectives du ligament, et comporte en outre des moyens pour fermer le ligament sur lui-meme. The prosthesis described in this document comprises a flexible ligament comprising a first thin part and a second wide part to allow lacing in "8" around the thorny of two contiguous vertebrae and to perform peri-spinous strapping; the prosthesis comprises a semi-flexible interspinous wedge pierced with two pairs of through channels, adapted for the passage of the two respective parts of the ligament, and further comprises means for closing the ligament on itself.

La demande de brevet FR-A-2 700 941 (FELMAN) décrit une cale inter-épineuse semi-rigide, composite. comprenant un noyau en tissu synthétique tressé et enroulé sur lui-même et comportant une coque en titane enveloppant de toute part le noyau en tissu synthétique, qui est de forme trapézoïdale comportant six faces ; la prothèse comporte en outre quatre appendices métalliques de fixation et quatre appendices textiles de fixation. Patent application FR-A-2 700 941 (FELMAN) describes a semi-rigid interspinous wedge, composite. comprising a core of synthetic fabric braided and wound on itself and comprising a titanium shell enveloping on all sides the core of synthetic fabric, which is trapezoidal in shape having six faces; the prosthesis also has four metal attachment appendages and four textile attachment appendages.

La présente invention a pour objet de procurer une cale interépineuse vertébrale améliorée pour rentrer dans la constitution d'une prothèse vertébrale de performance élevée. The object of the present invention is to provide an improved vertebral interspinous wedge for entering into the constitution of a high performance vertebral prosthesis.

Le problème posé, notamment par la prothèse décrite dans le document VOYDEVILLE qui comporte un ligament en polyester et une cale semi-souple en polyester également, est que les forces de pression entre la cale et les épineuses, ou bien entre la cale et le ligament, peuvent provoquer une usure des constituants de la prothèse aboutissant à une abrasion des faces en contact qui se traduit par la production de particules libres de polyester pouvant conduire à de très graves inflammations. The problem posed, in particular by the prosthesis described in the VOYDEVILLE document which includes a polyester ligament and a semi-flexible polyester wedge also, is that the pressure forces between the wedge and the thorny ones, or else between the wedge and the ligament , can cause wear of the components of the prosthesis resulting in abrasion of the contacting surfaces which results in the production of free polyester particles which can lead to very serious inflammations.

La présente invention vise notamment à remédier à cet inconvénient des cales pour prothèses vertébrales. The present invention aims in particular to remedy this drawback of wedges for vertebral prostheses.

La solution au problème posé consiste à procurer conformément à l'invention une cale inter-épineuse, essentiellement constituée par un noyau cylindrique élastique ou sensiblement viscoélastique, laquelle cale est dotée d'interfaces ou de faces de contact avec les épineuses, qui sont métalliques, et ladite cale comporte des moyens pour contrôler la déformation du noyau élastique, lesquels moyens de contrôle de la déformation sont de préférence constitués par une bande textile ceinturant le corps élastique. The solution to the problem posed consists in providing, in accordance with the invention, an interspinous wedge, essentially constituted by an elastic or substantially viscoelastic cylindrical core, which wedge is provided with interfaces or faces of contact with the thorny plants, which are metallic, and said wedge comprises means for controlling the deformation of the elastic core, which means for controlling the deformation are preferably constituted by a textile strip encircling the elastic body.

En d'autres termes l'invention consiste à procurer une cale inter-épineuse munie d'au moins deux canaux de passage d'un ligament, essentiellement constituée par
- un corps central en matériau visco élastique en forme de cylindre doté de deux faces parallèles,
- une plaque supérieure, mince, plane, métallique, dont le contour est sensiblement identique à la directrice dudit cylindre, qui est posée ou plaquée contre la face supérieure dudit corps,
- une plaque inférieure sensiblement identique à ladite plaque supérieure, qui est posée ou plaquée contre la face inférieure dudit corps,
- une bande textile, tissée ou tricotée, entourant ou ceinturant ledit corps.
In other words, the invention consists in providing an interspinous wedge provided with at least two channels for the passage of a ligament, essentially constituted by
- a central body in visco-elastic material in the form of a cylinder provided with two parallel faces,
an upper, thin, flat, metallic plate, the contour of which is substantially identical to the director of said cylinder, which is placed or pressed against the upper face of said body,
- a lower plate substantially identical to said upper plate, which is placed or pressed against the lower face of said body,
- a textile band, woven or knitted, surrounding or encircling said body.

Selon des modes préférentiels de réalisation de l'invention
- la directrice dudit cylindre est sensiblement symétrique par rapport à son axe longitudinal,
- la directrice dudit cylindre est sensiblement constituée par deux demi directrices disposées symétriquement par rapport à un axe longitudinal, chacune des demi-directrices étant constituée de trois tronçons curvilignes successifs disposés bout à bout, un premier tronçon curviligne convexe, un deuxième tronçon curviligne concave, un troisième tronçon curviligne convexe,
- ledit corps est sensiblement symétrique par rapport à un plan
P1, chaque demi-corps comportant trois faces latérales curvilignes adjacentes, une première face curviligne avant convexe, une deuxième face curviligne centrale concave, une troisième face curviligne arrière convexe,
- lesdites plaques inférieure et supérieure sont symétriques par rapport à un plan P1, chaque demi-plaque comportant trois faces latérales adjacentes, une première face curviligne convexe, une deuxième face curviligne concave, une troisième face curviligne convexe,
- ledit corps est essentiellement constitué par un bloc de silicone, lesdites plaques sont essentiellement constituées par du titane, et ladite bande est en textile polyester, c'est-à-dire d'un matériau différent du matériau utilisé pour la réalisation dudit corps,
- la cale comporte des liens de préférence textiles permettant d'attacher ou de fixer la bande ou ceinture au bord desdites plaques inférieures et supérieures,
- chacune desdites plaques inférieure et supérieure comporte des orifices de passage des liens, par exemple au nombre de 4, de préférence disposées symétriquement par rapport à des axes longitudinaux respectifs desdites plaques,
- ladite bande textile est enroulée autour dudit corps selon plusieurs tours ou enroulements, et comporte un premier tour ou enroulement épousant la paroi concave faisant partie des parois latérales dudit cylindre, laquelle bande comporte un deuxième tour n 'épousant pas ladite paroi ou face latérale concave dudit cylindre, de même que les tours de rangs supérieurs,
- lesdits canaux de passage du ligament sont délimités par des enroulements successifs de ladite bande, et ont une section transversale dont la surface est très grande (par exemple au moins 5 à 10 fois supérieure) par rapport à la surface d'une section transversale du ligament.
According to preferred embodiments of the invention
the director of said cylinder is substantially symmetrical with respect to its longitudinal axis,
the director of said cylinder is substantially constituted by two half-directors arranged symmetrically with respect to a longitudinal axis, each of the half-directors consisting of three successive curvilinear sections arranged end to end, a first convex curvilinear section, a second concave curvilinear section, a third convex curvilinear section,
- said body is substantially symmetrical with respect to a plane
P1, each half-body comprising three adjacent curvilinear lateral faces, a first convex curvilinear front face, a second concave central curvilinear face, a third convex rear curvilinear face,
said lower and upper plates are symmetrical with respect to a plane P1, each half-plate comprising three adjacent lateral faces, a first convex curvilinear face, a second concave curvilinear face, a third convex curvilinear face,
said body is essentially constituted by a block of silicone, said plates are essentially constituted by titanium, and said strip is made of polyester textile, that is to say of a material different from the material used for the production of said body,
the wedge comprises preferably textile links making it possible to attach or fix the strip or belt to the edge of said lower and upper plates,
each of said lower and upper plates has orifices for the passage of links, for example 4 in number, preferably arranged symmetrically with respect to respective longitudinal axes of said plates,
- Said textile strip is wound around said body in several turns or windings, and comprises a first turn or winding conforming to the concave wall forming part of the side walls of said cylinder, which strip comprises a second turn not marrying said concave wall or lateral face of said cylinder, as well as the towers of higher rows,
- Said ligament passage channels are delimited by successive windings of said strip, and have a cross section whose surface is very large (for example at least 5 to 10 times greater) relative to the surface of a cross section of the ligament.

Selon un mode préférentiel de réalisation, l'épaisseur desdites plaques est inférieure à la moitié de l'épaisseur dudit corps, par exemple de l'ordre de 1/5e à 1/10e de l'épaisseur dudit corps. According to a preferred embodiment, the thickness of said plates is less than half the thickness of said body, for example of the order of 1 / 5th to 1 / 10th of the thickness of said body.

L'ensemble des constituants de la cale selon l'invention et leur agencement particulier confèrent à cette cale un comportement élastique tant en compression qu'en extension. All the components of the block according to the invention and their particular arrangement give this block an elastic behavior both in compression and in extension.

Les cales selon l'invention évitent ou du moins limitent fortement la production de particules provenant de l'usure par contact ou frottement des parties abrasibles de ladite cale grâce notamment à la présence des moyens de contrôle de l'élasticité et/ou de la déformation (écrasement) du corps central, qui sont de préférence constitués par une bande textile ceinturant ce corps ; on peut également éviter des phénomènes de fissuration ou d'usure du corps central, susceptibles d'être provoqués au bout d'un certain temps après l'implantation de ces cales. The shims according to the invention avoid or at least greatly limit the production of particles originating from wear by contact or friction of the abrasive parts of said shim thanks in particular to the presence of means for controlling the elasticity and / or the deformation (crushing) of the central body, which are preferably constituted by a textile band surrounding this body; it is also possible to avoid cracking or wear phenomena of the central body, which can be caused after a certain time after the implantation of these wedges.

Grâce à la présence des plaques métalliques, de préférence en titane, formant interfaces ou faces de contact avec les épineuses, l'usure du bloc élastique central (de préférence en silicone) est évitée et grâce à la ceinture textile entourant le bloc silicone, on évite également le cisaillement du bloc central et son usure. Thanks to the presence of metal plates, preferably made of titanium, forming interfaces or faces of contact with the thorns, wear of the central elastic block (preferably silicone) is avoided and thanks to the textile belt surrounding the silicone block, also prevents shearing of the central block and its wear.

La forme particulière du bloc silicone et l'agencement particulier de la bande textile ceinturant le bloc silicone, permettent de définir des puits ou logements de passage d'un ligament (de fixation de la cale entre deux épineuses) qui permettent d'éviter ou de limiter très fortement tout frottement et par conséquent toute production de particules libres, susceptibles de provoquer des inflammations. The particular shape of the silicone block and the particular arrangement of the textile band encircling the silicone block, make it possible to define wells or housings for passage of a ligament (for fixing the wedge between two prickles) which make it possible to avoid or very strongly limit any friction and consequently any production of free particles, likely to cause inflammations.

Les nombreux avantages procurés par l'invention seront mieux compris au travers de la description suivante qui se réfère aux dessins annexés qui illustrent sans aucun caractère limitatif un mode préférentiel de réalisation de l'invention. The numerous advantages provided by the invention will be better understood through the following description which refers to the appended drawings which illustrate without any limiting character a preferred embodiment of the invention.

La Figure 1 illustre en vue en perspective schématique éclatée les quatre constituants essentiels d'une cale rentrant dans la composition d'une prothèse vertébrale selon l'invention. Figure 1 illustrates in exploded schematic perspective view the four essential components of a wedge used in the composition of a vertebral prosthesis according to the invention.

La Figure 2 qui est sensiblement une vue selon II de la Figure 1, illustre en vue en plan une cale inter-épineuse selon l'invention. Figure 2 which is substantially a view along II of Figure 1, illustrates in plan view an interspinous wedge according to the invention.

La cale 1 inter-épineuse est essentiellement constituée par une plaque 2 supérieure destinée à être posée et plaquée contre la face 6 supérieure d'un corps cylindrique central 3, une plaque inférieure 4 identique à la plaque supérieure 2, étant disposée ou plaquée contre la face inférieure 7 du corps central 3. The interspinous wedge 1 is essentially constituted by an upper plate 2 intended to be placed and pressed against the upper face 6 of a central cylindrical body 3, a lower plate 4 identical to the upper plate 2, being arranged or pressed against the underside 7 of the central body 3.

Comme illustré schématiquement Figure 1 et plus particulièrement
Figure 2, le corps 3 central et éventuellement les plaques supérieure et inférieure (2, 4) sont entourés ou ceinturés par une bande textile 5 qui est enroulée autour de la cale selon plusieurs tours, comme représenté schématiquement à la Figure 2, dans laquelle les repères 13 et 14 désignent les extrémités longitudinales de ladite bande 5 ; les repères 30 et 31 de la Figure 1 se réfèrent aux bords longitudinaux de ladite bande 5, lesquels bords longitudinaux sont parallèles entre eux et séparés d'une distance 23 constituant la largeur de la bande 5.
As shown schematically in Figure 1 and more particularly
Figure 2, the central body 3 and possibly the upper and lower plates (2, 4) are surrounded or surrounded by a textile band 5 which is wound around the wedge in several turns, as shown schematically in Figure 2, in which the references 13 and 14 designate the longitudinal ends of said strip 5; the references 30 and 31 of FIG. 1 refer to the longitudinal edges of said strip 5, which longitudinal edges are mutually parallel and separated by a distance 23 constituting the width of the strip 5.

La largeur ou hauteur 23 de la bande 5 est ainsi voisine de la hauteur 18 du corps central 3, éventuellement égale à la somme des hauteurs respectives 17, 18, 19, de ladite plaque inférieure dudit corps central 3 et de ladite plaque supérieure. The width or height 23 of the strip 5 is thus close to the height 18 of the central body 3, possibly equal to the sum of the respective heights 17, 18, 19, of said lower plate of said central body 3 and of said upper plate.

Comme illustré Figure 1, ledit corps 3, ainsi que lesdites plaques inférieure et supérieure 2, 4 sont de forme cylindrique, lesdites plaques 2, 4 étant minces ou très aplaties, leur épaisseur 17, 19 respective étant par exemple de l'ordre de 0,5 à 1 millimètre, pour une épaisseur du corps central 3 par exemple de l'ordre de 10 millimètres. As illustrated in FIG. 1, said body 3, as well as said lower and upper plates 2, 4 are of cylindrical shape, said plates 2, 4 being thin or very flat, their respective thickness 17, 19 being for example of the order of 0 , 5 to 1 millimeter, for a thickness of the central body 3 for example of the order of 10 millimeters.

Ledit corps 3 et lesdites plaques 2, 4 ont un profil identique ou très voisin qui est respectivement symétrique par rapport à des axes longitudinaux respectifs de ces trois éléments qui sont repérés 10, 11 et 12, lesquels axes sont parallèles et contenus dans un plan P1 de symétrie générale. Said body 3 and said plates 2, 4 have an identical or very similar profile which is respectively symmetrical with respect to respective longitudinal axes of these three elements which are marked 10, 11 and 12, which axes are parallel and contained in a plane P1 of general symmetry.

On voit en particulier sur la Figure 1 que, concernant la plaque supérieure 2, ladite plaque s'étend selon l'axe longitudinal 10, est symétrique par rapport à cet axe, comporte quatre trous ou orifices 16 traversant la plaque mince 2, qui servent à la fixation par couture par des liens textiles 15 par exemple, comme illustré Figure 2, des différents enroulements de la bande 5 avec lesdites plaques d'extrémité 2 et 4. It can be seen in particular in FIG. 1 that, concerning the upper plate 2, said plate extends along the longitudinal axis 10, is symmetrical with respect to this axis, has four holes or orifices 16 passing through the thin plate 2, which serve to the attachment by sewing with textile ties 15 for example, as illustrated in FIG. 2, of the various windings of the strip 5 with said end plates 2 and 4.

Par référence à la Figure 1, ladite plaque 2 supérieure comporte une face curviligne convexe 36, qui est adjacente à une face curviligne concave 37, elle-même adjacente à une face curviligne convexe arrière 38. With reference to FIG. 1, said upper plate 2 comprises a convex curvilinear face 36, which is adjacent to a concave curvilinear face 37, itself adjacent to a rear convex curvilinear face 38.

Comme illustré Figures 1 et 2, un point anguleux ou une arete vive peut être prévu à la jonction des deux faces curvilignes convexes "avant" 36 de ladite plaque 2, de même qu'illustré pour ce qui concerne le corps central 3, qui comporte également des faces curvilignes convexes 20 situées dans la partie avant dudit corps central qui sont disposées symétriquement par rapport à un plan P1 de symétrie générale de la cale, les deux faces 20 symétriques étant jointes par une arête 27 portant un point anguleux 9, comme également illustré Figure 2. As illustrated in FIGS. 1 and 2, an angular point or a sharp edge can be provided at the junction of the two convex curvilinear "front" faces 36 of said plate 2, as illustrated as regards the central body 3, which comprises also convex curvilinear faces 20 located in the front part of said central body which are arranged symmetrically with respect to a plane P1 of general symmetry of the wedge, the two symmetrical faces 20 being joined by an edge 27 carrying an angular point 9, as also illustrated Figure 2.

On voit donc sur cette Figure 1 que ledit corps central 3 comporte, outre ladite face avant convexe curviligne 20, une face centrale concave curviligne 21, suivie d'une face arrière convexe curviligne 22, dont les arêtes supérieures respectives 33, 34, 35 constituent des tronçons curvilignes qui sont respectivement convexe, concave et convexe, et qui définissent la demi-directrice du cylindre délimitant le corps central 3 ; ledit cylindre est d'axe vertical (par rapport à la Figure 1) qui est repéré 32 sur cette Figure. It can therefore be seen in this FIG. 1 that said central body 3 comprises, in addition to said convex curvilinear front face 20, a concave curvilinear central face 21, followed by a convex curvilinear rear face 22, whose respective upper edges 33, 34, 35 constitute curvilinear sections which are respectively convex, concave and convex, and which define the semi-director of the cylinder delimiting the central body 3; said cylinder has a vertical axis (relative to Figure 1) which is marked 32 in this Figure.

On voit également Figure 1 que des arêtes 28, 29 proéminentes constituent la frontière entre lesdites faces respectives 20, 21 d'une part et 21, 22 d'autre part, dudit corps central 3. It can also be seen in FIG. 1 that protruding edges 28, 29 constitute the border between said respective faces 20, 21 on the one hand and 21, 22 on the other hand, of said central body 3.

Comme illustré Figure 2, ladite bande 5 est enroulée autour de ladite cale, c'est-à-dire autour dudit corps et desdites plaques supérieure et inférieure qui sont plaquées contre les faces supérieure et inférieure du corps 3, pour constituer un premier tour s'étendant à partir d'une extrémité 13 de ladite bande, lequel premier tour ou enroulement 25 est au contact ou épouse la forme extérieure dudit bloc central 3 et éventuellement desdites plaques et en particulier épouse intimement la face centrale concave 21 ménagée dans le corps central 3 de part et d'autre de celui-ci, alors que le deuxième tour ou enroulement 26 de ladite bande 5 et éventuellement les enroulements suivants successifs (se terminant par la deuxième extrémité 14 de la bande 5) ne sont pas tous plaqués intimement contre ladite paroi concave 21, de sorte qu'ils s'étendent sensiblement selon une forme ovale 8 fictive représentée en pointillés sur la Figure 2, et délimitent ainsi avec ledit premier enroulement, c'est-à-dire avec la face concave dudit corps 3, deux canaux 24 cylindriques s'étendant parallèlement à l'axe repéré 32 Figure 1, et permettant le passage d'un ligament de fixation de la cale à deux épineuses consécutives de la colonne vertébrale. As illustrated in FIG. 2, said strip 5 is wound around said wedge, that is to say around said body and said upper and lower plates which are pressed against the upper and lower faces of the body 3, to constitute a first turn s extending from one end 13 of said strip, which first turn or winding 25 is in contact with or conforms to the external shape of said central block 3 and possibly of said plates and in particular intimately follows the concave central face 21 formed in the central body 3 on either side of it, while the second turn or winding 26 of said strip 5 and possibly the following successive windings (ending with the second end 14 of strip 5) are not all pressed intimately against said concave wall 21, so that they extend substantially in a fictitious oval shape 8 shown in dotted lines in FIG. 2, and thus delimit with said first winding, that is to say with the concave face of said body 3, two cylindrical channels 24 extending parallel to the axis identified 32 Figure 1, and allowing the passage of a wedge fixing ligament to two consecutive spiny spines.

Claims (10)

Translated fromFrench
REVENDICATIONS 1. Cale inter-épineuse munie d'au moins deux canaux (24) de passage d'un ligament, caractérisée en ce qu'elle est essentiellement constituée par 1. Interspinous wedge provided with at least two channels (24) for passage of a ligament, characterized in that it is essentially constituted by - un corps (3) central en matériau visco élastique en forme de cylindre (3) doté de deux faces (6, 7) parallèles, a central body (3) of visco-elastic material in the form of a cylinder (3) provided with two parallel faces (6, 7), - une plaque (2) supérieure, mince, plane, métallique, dont le contour est sensiblement identique à la directrice dudit cylindre, qui est posée ou plaquée contre la face supérieure (6) dudit corps (3), - an upper, thin, flat, metallic plate (2), the contour of which is substantially identical to the director of said cylinder, which is placed or pressed against the upper face (6) of said body (3), - une plaque (4) inférieure sensiblement identique à ladite plaque (2) supérieure, qui est posée ou plaquée contre la face inférieure (7) dudit corps (3), - a lower plate (4) substantially identical to said upper plate (2), which is placed or pressed against the lower face (7) of said body (3), - une bande textile (5), tissée ou tricotée, entourant ou ceinturant ledit corps (3). - a textile band (5), woven or knitted, surrounding or encircling said body (3). 2. Cale selon la revendication 1, dans laquelle la directrice dudit cylindre est sensiblement symétrique par rapport à son axe longitudinal (11). 2. Wedge according to claim 1, wherein the director of said cylinder is substantially symmetrical with respect to its longitudinal axis (11). 3. Cale selon l'une quelconque des revendications 1 à 2, dans laquelle la directrice dudit cylindre est sensiblement constituée par deux demi directrices disposées symétriquement par rapport à un axe longitudinal (11), chacune des demi-directrices étant constituée de trois tronçons curvilignes successifs disposés bout à bout, un premier tronçon curviligne (33) convexe, un deuxième tronçon curviligne (34) concave, un troisième tronçon curviligne (35) convexe. 3. Wedge according to any one of claims 1 to 2, wherein the director of said cylinder is substantially constituted by two half-directors arranged symmetrically with respect to a longitudinal axis (11), each of the half-directors consisting of three curvilinear sections successive arranged end to end, a first curvilinear section (33) convex, a second curvilinear section (34) concave, a third curvilinear section (35) convex. 4. Cale selon l'une quelconque des revendications 1 à 3, dans laquelle ledit corps (3) est sensiblement symétrique par rapport à un plan P1, chaque demi-corps comportant trois faces latérales curvilignes adjacentes, une première face curviligne avant convexe (20), une deuxième face curviligne centrale concave (21), une troisième face curviligne arrière convexe (22). 4. Wedge according to any one of claims 1 to 3, in which said body (3) is substantially symmetrical with respect to a plane P1, each half-body comprising three adjacent curvilinear side faces, a first curved front convex face (20 ), a second concave central curvilinear face (21), a third convex rear curvilinear face (22). 5. Cale selon l'une quelconque des revendications 1 à 4, dans laquelle lesdites plaques inférieure et supérieure (2, 4) sont symétriques par rapport à un plan P1, chaque demi-plaque comportant trois faces latérales adjacentes, une première face curviligne convexe (36), une deuxième face curviligne concave (37), une troisième face curviligne convexe (38). 5. Wedge according to any one of claims 1 to 4, in which said lower and upper plates (2, 4) are symmetrical with respect to a plane P1, each half-plate comprising three adjacent lateral faces, a first convex curvilinear face. (36), a second concave curvilinear face (37), a third convex curvilinear face (38). 6. Cale selon l'une quelconque des revendications 1 à 5, dans laquelle ledit corps est essentiellement constitué par un bloc de silicone, lesdites plaques sont essentiellement constituées par du titane, et ladite bande est en textile polyester. 6. Wedge according to any one of claims 1 to 5, wherein said body is essentially constituted by a silicone block, said plates are essentially constituted by titanium, and said strip is made of polyester textile. 7. Cale selon l'une quelconque des revendications 1 à 6, comportant des liens (15) de préférence textiles permettant d'attacher ou de fixer la bande (5) ou ceinture au bord desdites plaques inférieure et supérieure (2, 4). 7. Wedge according to any one of claims 1 to 6, comprising ties (15) preferably textiles for attaching or fixing the band (5) or belt at the edge of said lower and upper plates (2, 4). 8. Cale selon la revendication 7, dans laquelle chacune desdites plaques inférieure et supérieure comporte des orifices (16) de passage des liens (15). 8. Wedge according to claim 7, wherein each of said lower and upper plates has orifices (16) for passage of the links (15). 9. Cale selon l'une quelconque des revendications 1 à 8, dans laquelle ladite bande est enroulée autour dudit corps (3) selon plusieurs tours (25, 26), et comporte un premier tour (25) épousant la paroi concave (21) faisant partie des parois latérales dudit cylindre, laquelle bande comporte un deuxième tour n'épousant pas ladite paroi concave (21). 9. Wedge according to any one of claims 1 to 8, wherein said strip is wound around said body (3) in several turns (25, 26), and comprises a first turn (25) matching the concave wall (21) forming part of the side walls of said cylinder, which strip has a second turn which does not conform to said concave wall (21). 10. Cale selon l'une quelconque des revendications 1 à 9, dans laquelle lesdits canaux (24) de passage du ligament sont délimités par des enroulements successifs de ladite bande (5). 10. Wedge according to any one of claims 1 to 9, wherein said channels (24) for passage of the ligament are delimited by successive windings of said strip (5).
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