FR2711511A1 - Temporary metatarso-phalangeal prostheses - Google Patents

Temporary metatarso-phalangeal prostheses Download PDF

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Publication number
FR2711511A1
FR2711511A1 FR9313143A FR9313143A FR2711511A1 FR 2711511 A1 FR2711511 A1 FR 2711511A1 FR 9313143 A FR9313143 A FR 9313143A FR 9313143 A FR9313143 A FR 9313143A FR 2711511 A1 FR2711511 A1 FR 2711511A1
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prosthesis
face
axis
center
millimeters
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Granted
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FR9313143A
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French (fr)
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FR2711511B1 (en
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Jarde Olivier
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/42—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes
    • A61F2/4225—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for feet, e.g. toes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • A61F2002/30113—Rounded shapes, e.g. with rounded corners circular
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30462—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements retained or tied with a rope, string, thread, wire or cable
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30667—Features concerning an interaction with the environment or a particular use of the prosthesis
    • A61F2002/30672—Features concerning an interaction with the environment or a particular use of the prosthesis temporary
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30721—Accessories
    • A61F2002/30754—Implants for interposition between two natural articular surfaces
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30772—Apertures or holes, e.g. of circular cross section
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/42—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes
    • A61F2/4225—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for feet, e.g. toes
    • A61F2002/4233—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for feet, e.g. toes for metatarso-phalangeal joints, i.e. MTP joints
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0075—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004—Rounded shapes, e.g. with rounded corners
    • A61F2230/0006—Rounded shapes, e.g. with rounded corners circular

Abstract

The present invention relates to a metatarso-phalangeal prosthesis in the form of a disc which is drilled with a substantially central recess (5). The ratio between the total thickness (E3) of the said prosthesis and the thickness (E1) of the central part of the said prosthesis is greater than or equal to 2. The technical field of the invention is that of the manufacture of bone prostheses.

Description

PROTES ES METATARSO - PHALANG lENNES TEMPORAIRES
DESCRIPTION
La présente invention est relative à une prothèse métatarsophalangienne destinée à être implantée temporairement à l'interface entre un métatarse et une phalange.PROTES ES METATARSO - PHALANG TEMPORARY LENNES
DESCRIPTION
The present invention relates to a metatarsophalangeal prosthesis intended to be temporarily implanted at the interface between a metatarsus and a phalanx.

Le domaine technique de l'invention est celui de la fabrication de prothèses osseuses. The technical field of the invention is that of manufacturing bone prostheses.

On connaît déjà par le brevet FR. 2.622.100 (BAROUK) un implant prothétique articulaire à fixation temporaire, constitué par une cupule percée en son centre d'un trou, qui est destinée à être mise en place entre deux pièces osseuses tel qu'un métatarse et une phalange, gracie à une broche de fixation et d'immobilisation provisoire de la cupule; la prothèse est munie de deux faces parallèles, l'une convexe, l'autre concave. We already know by the FR patent. 2,622,100 (BAROUK) an articular prosthetic implant with temporary fixation, constituted by a cup pierced in its center with a hole, which is intended to be placed between two bony pieces such as a metatarsus and a phalanx, thanks to a fixing pin and temporary immobilization of the cup; the prosthesis is provided with two parallel faces, one convex, the other concave.

La présente invention a pour objet d'améliorer les prothèses métatarso-phalangiennes telles que celles décrites dans le document ci-dessus; un objectif de l'invention est également de procurer une telle prothèse qui soit temporaire, c 'est-à-dire qui puisse être extraite des l'organisme après une durée suffisante, lorsque le tissu fibreux de l'articulation s'est reformé. The object of the present invention is to improve metatarsophalangeal prostheses such as those described in the document above; an object of the invention is also to provide such a prosthesis which is temporary, that is to say which can be extracted from the body after a sufficient time, when the fibrous tissue of the joint has reformed.

La solution au problème posé consiste à procurer une prothèse métatarso-phalangienne en forme générale de disque ou de bouton, percée sensiblement en son centre d'un évidemment sensiblement central, permettant le passage éventuel d'une broche de fixation temporaire de ladite prothèse, dans laquelle le rapport entre l'épaisseur totale de ladite prothèse et l'épaisseur de la partie centrale de ladite prothèse est supérieur ou égal à 2, par exemple supérieur ou égal à 3. The solution to the problem posed consists in providing a metatarsophalangeal prosthesis in the general shape of a disc or button, pierced substantially in its center with a substantially central recess, allowing the possible passage of a pin for temporary fixing of said prosthesis, in which the ratio between the total thickness of said prosthesis and the thickness of the central part of said prosthesis is greater than or equal to 2, for example greater than or equal to 3.

Avantageusement, l'épaisseur de la zone ou partie centrale de ladite prothèse, c'est-à-dire la partie de ladite prothèse située à proximité dudit évidement central, est inférieure à 2 millimètre, par exemple voisine de 1 millimètre. Advantageously, the thickness of the central area or part of said prosthesis, that is to say the part of said prosthesis located near said central recess, is less than 2 millimeters, for example close to 1 millimeter.

Avantageusement, ladite prothèse comporte une première face d'appui ou de portée du métatarse, et comporte une troisième face d'appui ou de portée d'une phalange, lesquelles première et troisième faces constituent les faces principales de ladite prothèse en forme de disque, laquelle troisième face d'appui est entourée d'un bourrelet périphérique, sensiblement annulaire, par exemple en forme de tore de section sensiblement demi circulaire. Advantageously, said prosthesis comprises a first bearing face or surface of the metatarsus, and comprises a third bearing face or surface of a phalanx, which first and third faces constitute the main faces of said prosthesis in the form of a disc, which third bearing face is surrounded by a peripheral bead, substantially annular, for example in the form of a torus of substantially semicircular section.

Avantageusement, ladite prothèse comporte un évidement ou perçage périphérique, d'axe sensiblement parallèle à l'axe sensiblement de révolution ou de symétrie de ladite prothèse. Advantageously, said prosthesis includes a peripheral recess or drilling, with an axis substantially parallel to the axis of revolution or of symmetry of said prosthesis.

Avantageusement, ladite prothèse comporte également une première face d'appui ou de portée d'un métatarse, concave, sensiblement sphérique de rayon R1, de centre C1 et de diamètre extérieur D1, tel que le rapport dudit rayon R1 exprimé en millimètre audit diamètre extérieur exprimé en millimètre, est compris entre 2 et 3, par exemple voisin de 2,5. Advantageously, said prosthesis also comprises a first bearing face or surface of a concatenated, substantially spherical metatarsus of radius R1, of center C1 and of outside diameter D1, such that the ratio of said radius R1 expressed in millimeters to said outside diameter expressed in millimeters, is between 2 and 3, for example around 2.5.

Avantageusement, la tranche ou surface ou face externe de ladite prothèse en forme de disque, est sensiblement conique ou tronconique, ayant pour axe ledit axe de symétrie de ladite prothèse, de centre situé du même côté de ladite prothèse qu'une face d'appui ou de portée de phalange. Advantageously, the edge or surface or external face of said prosthesis in the form of a disc is substantially conical or frustoconical, having for axis said axis of symmetry of said prosthesis, with a center located on the same side of said prosthesis as a bearing face. or phalanx range.

Avantageusement l'angle au centre A du cône selon lequel s'étend ladite surface périphérique ou tranche de ladite prothèse, a une valeur comprise entre 10 et 25 , de préférence comprise entre 12 et 20 , par exemple voisine de 15".  Advantageously, the angle at the center A of the cone along which extends said peripheral surface or section of said prosthesis, has a value between 10 and 25, preferably between 12 and 20, for example close to 15 ".

Les prothèses métatarso-phalangiennes selon l'invention ont de nombreux avantages; grâce à leur forme particulière, notamment la forme de leur dite face d'appui, et particulièrement grâce à leur épaisseur très faible dans la zone centrale de la prothèse, les prothèses selon l'invention peuvent être retirées facilement par un court abord interne, par exemple environ un an après leur mise en place; cette ablation laisse place à une néo-articulation mobile et non douloureuse, la prothèse ayant un tissu fibreux de bonne qualité au niveau des surfaces articulaires situées en regard des faces d'appui de ladite prothèse. The metatarsophalangeal prostheses according to the invention have numerous advantages; thanks to their particular shape, in particular the shape of their so-called bearing face, and particularly thanks to their very small thickness in the central zone of the prosthesis, the prostheses according to the invention can be easily removed by a short internal approach, by example about a year after their implementation; this ablation gives way to a mobile and painless neo-articulation, the prosthesis having a good quality fibrous tissue at the articular surfaces located opposite the bearing faces of said prosthesis.

Par ailleurs, les prothèses selon l'invention peuvent être fixées temporairement, soit par l'intermédiaire d'une broche axiale temporaire, qui peut par exemple être retirée quelques semaines après la mise en place de la prothèse, et de préférence, à l'aide d'un fil résorbable qui peut traverser la périphérie de ladite prothèse grâce audit évidement périphérique ou excentré de faible diamètre, permettant le passage dudit fil résorbable, qui permet une fixation externe de la prothèse sur le tendon abducteur du gros orteil. Furthermore, the prostheses according to the invention can be fixed temporarily, either by means of a temporary axial pin, which can for example be removed a few weeks after the implantation of the prosthesis, and preferably at the using an absorbable wire which can cross the periphery of said prosthesis thanks to said peripheral or eccentric recess of small diameter, allowing the passage of said absorbable wire, which allows an external fixation of the prosthesis on the abductor tendon of the big toe.

Grâce au profil tronconique particulier de ladite prothèse, ladite prothèse s'adapte parfaitement à la morphologie de l'articulation métatarso-phalangienne. Thanks to the particular frustoconical profile of said prosthesis, said prosthesis adapts perfectly to the morphology of the metatarsophalangeal joint.

De plus, le centrage et le positionnement de la prothèse selon l'invention peut être optimal, grâce notamment à la configuration particulière desdites faces d'appui prévues sur ladite prothèse, ainsi que grâce audit bourrelet ou protubérance périphérique prévu sur l'une des faces d'appui de ladite prothèse. In addition, the centering and positioning of the prosthesis according to the invention can be optimal, in particular thanks to the particular configuration of said bearing faces provided on said prosthesis, as well as thanks to said bead or peripheral protuberance provided on one of the faces. support of said prosthesis.

De préférence, la prothèse est réalisée dans un matériau tel que de l'acier inoxydable permettant d'éviter une lyse osseuse, et induisant la production d'un tissu fibreux de bonne qualité au niveau de résection de la base phalangienne, et respectant le cartilage laissé en place au niveau de la tête métatarsienne. Preferably, the prosthesis is made of a material such as stainless steel making it possible to avoid bone lysis, and inducing the production of a good quality fibrous tissue at the level of resection of the phalangeal base, and respecting the cartilage. left in place at the metatarsal head.

Les nombreux avantages procurés par l'invention seront mieux compris au travers de la description suivante qui se réfère aux dessins annexéx qui illustrent sans caractère limitatif un mode particulier de réalisation d'une prothèse selon l'invention. The numerous advantages provided by the invention will be better understood through the following description which refers to the annexed drawings which illustrate without limiting a particular embodiment of a prosthesis according to the invention.

La figure 1 illustre est une vue en coupe par un plan contenant l'axe xxl de symétrie et/ou de révolution de ladite prothèse en forme générale de disque. Figure 1 illustrates is a sectional view through a plane containing the axis xxl of symmetry and / or revolution of said prosthesis in general disc shape.

La figure 2 est une vue selon II de la figure 1. FIG. 2 is a view along II of FIG. 1.

Par référence aux figures 1 et 2, on voit que la prothèse métatarso-phalangienne selon l'invention a une forme générale de disque ou de bouton, d'axe de symétrie générale xxl. With reference to FIGS. 1 and 2, it can be seen that the metatarsophalangeal prosthesis according to the invention has a general shape of a disc or button, with an axis of general symmetry xxl.

Ladite prothèse est délimitée par une face 1 concave, par exemple sphérique, constituant une première face ou face d'appui de ladite prothèse sur la tête métatarsienne. Said prosthesis is delimited by a concave face 1, for example spherical, constituting a first face or bearing face of said prosthesis on the metatarsal head.

La face de ladite prothèse opposée à ladite face d'appui 1 est une troisième face 3 d'appui ou de portée de l'extrémité de la phalange, laquelle troisième face d'appui 3 peut être par exemple sensiblement plane et perpendiculaire audit axe xxl. The face of said prosthesis opposite to said bearing face 1 is a third bearing face 3 or supported by the end of the phalanx, which third bearing face 3 can for example be substantially flat and perpendicular to said axis xxl .

On voit que ladite prothèse est percée en son centre d'un alésage ou évidement 5 cylindrique, centré sur ledit axe xxl, et conformément à une caractéristique préférentielle de l'invention, ladite prothèse comporte un deuxième évidement ou alésage 6, de faible diamètre, par exemple voisin de 1 millimètre, d'axe xx2 parallèle audit axe xxl; ledit deuxième évidement 6 est situé à la périphérie de ladite prothèse, de manière à permettre le passage d'un fil résorbable permettant l'immobilisation temporaire de ladite prothèse. It can be seen that said prosthesis is pierced in its center with a cylindrical bore or recess 5, centered on said axis xxl, and in accordance with a preferred characteristic of the invention, said prosthesis comprises a second recess or bore 6, of small diameter, for example around 1 millimeter, of axis xx2 parallel to said axis xxl; said second recess 6 is located at the periphery of said prosthesis, so as to allow the passage of an absorbable wire allowing the temporary immobilization of said prosthesis.

Par référence à la figure 1, on voit que ladite première face d'appui sphérique 1 peut être définie par un rayon R1 et un centre C1 situés sur ledit axe xxl, ladite première face d'appui 1 étant limitée à un diamètre D1 correspondant au diamètre hors tout ou extérieur de ladite prothèse. With reference to FIG. 1, it can be seen that said first spherical bearing face 1 can be defined by a radius R1 and a center C1 situated on said axis xxl, said first bearing face 1 being limited to a diameter D1 corresponding to the overall or outside diameter of said prosthesis.

Conformément à une des caractéristiques de l'invention, le profil de ladite prothèse représentée à la figure 1 est sensiblement tronconique, c'est-à-dire que la face périphérique ou tranche 2 de ladite prothèse épouse une surface tronconique d'angle d'ouverture A avantageusement voisin de 15 et de centre C2 situé d'un même côté de ladite prothèse que ladite troisième face d'appui 3, lequel centre C2 est avantageusement situé sur ledit axe xxl. According to one of the characteristics of the invention, the profile of said prosthesis shown in FIG. 1 is substantially frustoconical, that is to say that the peripheral face or edge 2 of said prosthesis marries a frustoconical surface with an angle of opening A advantageously close to 15 and with center C2 located on the same side of said prosthesis as said third bearing face 3, which center C2 is advantageously located on said axis xxl.

On voit également sur la figure 1 que dans la zone centrale de ladite prothèse, c'est-à-dire au voisinage dudit évidement central 5, ladite prothèse a une épaisseur El très faible, par exemple voisine de 1 millimètre, alors que l'épaisseur totale E3 de ladite prothèse en forme de disque peut être par exemple de l'ordre de 3 à 5 millimètre. It can also be seen in FIG. 1 that in the central zone of said prosthesis, that is to say in the vicinity of said central recess 5, said prosthesis has a very low thickness El, for example close to 1 millimeter, while the total thickness E3 of said disc-shaped prosthesis can be for example of the order of 3 to 5 millimeters.

Conformément à une autre caractéristique de l'invention, ladite troisième face d'appui 3 est limitée à sa périphérie par un bourrelet 7 ou protubérance de forme sensiblement annulaire ou toroidale de section demi circulaire et de rayon R2, dont la surface externe 4 relie ladite surface périphérique 2 sensiblement tronconique avec ladite face 3 d'appui phalangienne. According to another characteristic of the invention, said third bearing face 3 is limited at its periphery by a bead 7 or protuberance of substantially annular or toroidal shape of semi-circular section and radius R2, the external surface 4 of which connects said peripheral surface 2 substantially frustoconical with said face 3 of phalangeal support.

Dans un mode particulier de réalisation de ladite prothèse, ledit évidement central 5 peut avoir un diamètre D2 de l'ordre de 2 millimètre permettant le passage d'une broche de fixation temporaire de diamètre voisin de 1 millimètre.  In a particular embodiment of said prosthesis, said central recess 5 may have a diameter D2 of the order of 2 millimeters allowing the passage of a temporary fixing pin with a diameter close to 1 millimeter.

Claims (7)

REVENDICATIONS 1. Prothèse métatarso-phalangienne en forme de disque, percée d'un évidemment (5) sensiblement central, caractérisée en ce que le rapport entre l'épaisseur totale (E3) de ladite prothèse et l'épaisseur (El) de la partie centrale de ladite prothèse est supérieur ou égal à 2. 1. Metatarsophalangeal disc-shaped prosthesis, pierced with a substantially central recess (5), characterized in that the ratio between the total thickness (E3) of said prosthesis and the thickness (El) of the central part of said prosthesis is greater than or equal to 2. 2. Prothèse selon la revendication 1, caractérisée en ce que l'épaisseur (El) de la zone ou partie centrale de ladite prothèse, c'est-à-dire la partie de ladite prothèse située à proximité dudit évidement central, est inférieure à 2 millimètre, par exemple voisine de 1 millimètre. 2. Prosthesis according to claim 1, characterized in that the thickness (El) of the zone or central part of said prosthesis, that is to say the part of said prosthesis located near said central recess, is less than 2 millimeters, for example close to 1 millimeter. 3. Prothèse selon l'une quelconque des revendications 1 à 2, comportant une première face (1) d'appui ou de portée du métatarse, et comportant une troisième face (3) d'appui ou de portée d'une phalange, lesquelles première et troisième faces constituent les faces principales de ladite prothèse en forme de disque, dans laquelle ladite troisième face d'appui est entourée d'un bourrelet (7) périphérique, sensiblement annulaire, par exemple en forme de tore de section sensiblement demi circulaire, de rayon (R2). 3. Prosthesis according to any one of claims 1 to 2, comprising a first face (1) for supporting or carrying the metatarsus, and comprising a third face (3) for supporting or carrying a phalanx, which first and third faces constitute the main faces of said prosthesis in the form of a disc, in which said third bearing face is surrounded by a peripheral bead (7), substantially annular, for example in the form of a torus of substantially semicircular section, radius (R2). 4. Prothèse selon l'une quelconque des revendications 1 à 3, caractérisée en ce qu'elle comporte un évidement ou perçage (6) périphérique, d'axe (xx2) sensiblement parallèle à l'axe (xxl) de symétrie de ladite prothèse. 4. Prosthesis according to any one of claims 1 to 3, characterized in that it comprises a recess or drilling (6) peripheral, of axis (xx2) substantially parallel to the axis (xxl) of symmetry of said prosthesis . 5. Prothèse selon l'une quelconque des revendications 1 à 4, comportant une première face (1) d'appui ou de portée d'un métatarse, concave, sensiblement sphérique de rayon (R1), de centre (C1) et de diamètre extérieur (D1), tel que le rapport dudit rayon (R1) exprimé en millimètre audit diamètre extérieur (D1) exprimé en millimètre, est compris entre 2 et 3. 5. Prosthesis according to any one of claims 1 to 4, comprising a first face (1) for supporting or carrying a metatarsal, concave, substantially spherical with radius (R1), center (C1) and diameter outside (D1), such that the ratio of said radius (R1) expressed in millimeters to said outside diameter (D1) expressed in millimeters, is between 2 and 3. 6. Prothèse selon l'une quelconque des revendications 1 à 5, dans laquelle la face externe (2) de ladite prothèse, est sensiblement tronconique, ayant pour axe ledit axe (xxl) de symétrie de ladite prothèse, de centre (C2) situé du même côté de ladite prothèse qu'une face (3) d'appui de phalange. 6. Prosthesis according to any one of claims 1 to 5, in which the external face (2) of said prosthesis is substantially frustoconical, having for axis said axis (xxl) of symmetry of said prosthesis, with center (C2) located on the same side of said prosthesis as a phalanx bearing face (3). 7. Prothèse selon la revendication 6, caractérisée en ce que l'angle au centre (A) du cône selon lequel s'étend ladite surface externe périphérique (2) de ladite prothèse, a une valeur comprise entre 10 et 25 .  7. Prosthesis according to claim 6, characterized in that the angle at the center (A) of the cone along which extends said peripheral external surface (2) of said prosthesis, has a value between 10 and 25.
FR9313143A 1993-10-28 1993-10-28 Temporary metatarsophalangeal prostheses. Expired - Lifetime FR2711511B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1643945A1 (en) * 2003-04-18 2006-04-12 Ascension Orthopedics, Inc. Interpositional biarticular disk implant
FR2901121A1 (en) * 2006-05-17 2007-11-23 Fournitures Hospitalieres Ind Phalangeal head prosthesis for use on e.g. phalanx, has lateral surface delimited by cylindrical surface, and part`s end with convex surface articulated in cavity formed by base of phalanx and oriented opposite to opening of cavity
EP2524671A1 (en) * 2011-05-19 2012-11-21 Tornier Metatarsophalangeal or metacarpophalangeal joint implant

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0034912A1 (en) * 1980-02-21 1981-09-02 J. & P. Coats, Limited Device for use in the treatment of damaged articular surfaces of human joints
EP0201651A1 (en) * 1983-11-17 1986-11-20 Jean-François Lelievre Prosthetic implant for a metatarso phalangeal joint and milling device for setting it in place
FR2622100A1 (en) * 1987-10-27 1989-04-28 Barouk Louis JOINT PROTHETIC IMPLANT WITH TEMPORARY FASTENING

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0034912A1 (en) * 1980-02-21 1981-09-02 J. & P. Coats, Limited Device for use in the treatment of damaged articular surfaces of human joints
EP0201651A1 (en) * 1983-11-17 1986-11-20 Jean-François Lelievre Prosthetic implant for a metatarso phalangeal joint and milling device for setting it in place
FR2622100A1 (en) * 1987-10-27 1989-04-28 Barouk Louis JOINT PROTHETIC IMPLANT WITH TEMPORARY FASTENING

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1643945A1 (en) * 2003-04-18 2006-04-12 Ascension Orthopedics, Inc. Interpositional biarticular disk implant
EP1643945A4 (en) * 2003-04-18 2010-09-08 Ascension Orthopedics Inc Interpositional biarticular disk implant
US7837739B2 (en) 2003-04-18 2010-11-23 Ascension Orthopedics, Inc. Interpositional biarticular disk implant
FR2901121A1 (en) * 2006-05-17 2007-11-23 Fournitures Hospitalieres Ind Phalangeal head prosthesis for use on e.g. phalanx, has lateral surface delimited by cylindrical surface, and part`s end with convex surface articulated in cavity formed by base of phalanx and oriented opposite to opening of cavity
EP2524671A1 (en) * 2011-05-19 2012-11-21 Tornier Metatarsophalangeal or metacarpophalangeal joint implant
FR2975279A1 (en) * 2011-05-19 2012-11-23 Tornier Sa JOINT IMPLANT OF METATARSO-PHALANGIAN OR METACARPO-PHALANGIAN INTERPOSITION

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