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WO1999026561A1 - Tibial implant for knee prosthesis - Google Patents

Tibial implant for knee prosthesis Download PDF

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Publication number
WO1999026561A1
WO1999026561A1 PCT/FR1998/002433 FR9802433W WO9926561A1 WO 1999026561 A1 WO1999026561 A1 WO 1999026561A1 FR 9802433 W FR9802433 W FR 9802433W WO 9926561 A1 WO9926561 A1 WO 9926561A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheath
tibial
base
notch
implant
Prior art date
Application number
PCT/FR1998/002433
Other languages
French (fr)
Inventor
Gérard Saillant
Gérard SENLY
Original Assignee
Fabrique D'implants Et D'instruments Chirurgicaux F.I.I. (S.A.)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fabrique D'implants Et D'instruments Chirurgicaux F.I.I. (S.A.) filed Critical Fabrique D'implants Et D'instruments Chirurgicaux F.I.I. (S.A.)
Priority to EP98955659A priority Critical patent/EP1033948A1/en
Publication of WO1999026561A1 publication Critical patent/WO1999026561A1/en

Links

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
    • A61F2/38—Joints for elbows or knees
    • A61F2/3868—Joints for elbows or knees with sliding tibial bearing
    • 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
    • A61F2/38—Joints for elbows or knees
    • A61F2/3836—Special connection between upper and lower leg, e.g. constrained
    • A61F2/384—Special connection between upper and lower leg, e.g. constrained hinged, i.e. with transverse axle restricting the movement
    • A61F2/385—Special connection between upper and lower leg, e.g. constrained hinged, i.e. with transverse axle restricting the movement also provided with condylar bearing surfaces

Definitions

  • the invention relates to the technical sector of knee joint prostheses comprising a femoral implant cooperating with a tibial implant.
  • the invention finds a particularly advantageous application, in the case of a total knee prosthesis, which comprises a femoral element receiving a transverse articulation axis mounted with free rotation relative to a cylindrical rod, engaged in a sheath integral with the tibial element, as is apparent from the teaching of the patent FR 2,696,927.
  • the tibial element comprises a base receiving a polyethylene plate which is mounted with limited rotational displacement capacity in a horizontal plane on said base.
  • the tibial plateau receives the femoral element in support with angular flexion capacity.
  • the femoral plate is mounted with limited rotational displacement capacity, relative to the sheath secured to the tibial base.
  • the tibial plateau which is drilled right through to allow the free engagement of the sheath, has a collar intended to bear on a determined part of the tibial plateau thus ensuring its coupling relative to the tibial base.
  • the problem which the invention proposes to solve is to be able to easily and instantaneously couple a tibial plateau relative to a tibial base fitted with a sheath cooperating with the articulation rod of the femoral element, while having the possibility of give the tibial plateau a limited rotational movement relative to said sheath.
  • the plate has along its axis of symmetry and from its rear edge, a profiled and shouldered notch delimiting a constricted entry, for, on the one hand being engaged by elasticity around the sheath and, on the other hand, be held in the locked position relative to a flange presented by said sheath, while having a movement of freedom in rotation relative to the sheath, said flange cooperating with a shouldered area formed from the opening of the constricted entrance.
  • the shouldered area is formed at a distance from the base of the plate corresponding substantially to the height separating the bearing face of the base from the underside of the flange.
  • the shoulder area has, on the side of the opening of the notch, two parallel rectilinear edges which are tangentially connected with an edge semicircular, delimiting a support area for the collar.
  • the notch has, on the side of its opening, and in top view, two rectilinear edges oriented in a divergent manner to be connected with two parallel rectilinear segments themselves connected to the bottom of the notch in the form of a semi circular rim which corresponds to the diameter of the sheath and extends beyond a half circumference, to enclose said sheath and create a clipping effect while allowing limited rotation of the plate.
  • the inlet of the two divergent straight edges has a width less than the diameter of the sheath to ensure elastic expansion of the bottom of the notch in order to allow the engagement of the sheath under a pressure force.
  • FIG. 1 is a perspective view of the tibial implant, before placement of the tray relative to the base.
  • FIG. 2 is a longitudinal sectional view of the tibial implant after coupling of the plate on the base.
  • FIG. 3 is a sectional view taken along line 3.3 of Figure 2.
  • - Figure 4 is a cross-sectional view taken along line 4.4 of Figure 3.
  • FIG. 5 is a sectional view of the entire prosthesis.
  • the tibial implant finds a particularly advantageous application in the case of a total knee prosthesis, of the type described in patent FR 2696927, of which the applicant for this is also holder.
  • the tibial implant comprises a polyethylene plate (1) and a metal base (2).
  • the base (2) is equipped with a sheath (3) intended to receive a rod secured to a transverse axis presented by the femoral element.
  • the sheath (3) is mounted on the posterior side of the tibial base (2).
  • the sleeve (3) is engaged in a well (2a) of the base, being fixed there by any known and appropriate means, in particular by welding.
  • the sheath (3) has, at a determined distance (d) from the bearing surface of the tibial base, a bearing and abutment collar (3a).
  • the sleeve (3) and the collar (3a) are of circular cross section in order to act as a pivot axis at the tibial plateau (1) by giving it degrees of freedom of rotational movement, in a horizontal plane.
  • a profiled notch delimits a constricted entry (lai) in order, on the one hand, to be engaged by elasticity around the sheath (3) and, on the other hand, to be held in the locked position, relative to the flange ( 3 a), while having a movement of freedom in rotation, with respect to said sheath.
  • the profiled notch (la) has on the side of its opening (la2), a shouldered zone (la3) for the engagement of the collar (3a) of the sleeve.
  • the shoulder area (la3) is formed at a distance (dl) from the base of the plate, corresponding very substantially to the distance (d) separating, as indicated above, the support base from the base (2) from the underside of the collar (3a).
  • the shoulder area (la3) has, on the side of the opening (la2) of the notch (la), two parallel straight edges (a) (b) which are tangentially connected with a semi-circular edge (c) delimiting a support area (la4) for the collar (3a).
  • the notch (la) has, still on the side of its opening (la2) and in top view, corresponding to the bearing and sliding face of the tibial plateau, two straight edges (d) (e), divergently oriented to connect with two straight segments parallel (f) and (g) themselves connected to the bottom (la5) of the notch in the form of a semi-circular rim which corresponds to the diameter of the sheath and which extends beyond a half circumference.
  • the two rectilinear edges (f) and (g) have a width (1) less than the diameter of the sheath (3) to ensure elastic expansion of the bottom (la5) of the notch, in order to allow the engagement of said sheath ( 3) under pressure.
  • the bottom (la5) of the groove (la) in which is positioned in support the sheath (3) delimits a semi-circular edge extending beyond a half circumference.
  • the engagement of the plate relative to the sheath has the effect, at the time of the introduction, of spreading the notch in order to allow the engagement of said sheath then, after having crossed the zone narrowed (fg), its relaxation by elasticity, in order to close concomitantly on the cross section of said sheath, thus obtaining, in known manner, a clipping effect.

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

Abstract

The invention concerns an implant comprising a metal tibial base plate (2) receiving a polyethylene tibial plateau (1), said base plate (2) being provided with a tubular sheath (3) for engaging and guiding a finger articulated on one part of a femoral implant designed to co-operate with the tibial plateau in particular. The invention is characterised in that the plateau (1) has along its axis of symmetry and from its rear edge, a streamlined and shouldered loop-like penetration (1a) defining a constricted opening (1a1) designed to be engaged elastically around the sheath (3) and to be maintained in locking position relative to a flange (3a) arranged on the sheath, while being free in rotation relative to the sheath (3).

Description

IMPLANT TIBIAL POUR PROTHESE DU GENOU. TIBIAL IMPLANT FOR KNEE PROSTHESIS.
L'invention se rattache au secteur technique des prothèses d'articulation du genou comprenant un implant fémoral coopérant avec un implant tibial.The invention relates to the technical sector of knee joint prostheses comprising a femoral implant cooperating with a tibial implant.
Plus particulièrement, l'invention trouve une application particulièrement avantageuse, dans le cas d'une prothèse totale du genou, qui comprend un élément fémoral recevant un axe transversal d'articulation monté à libre rotation par rapport à une tige cylindrique, engagée dans un fourreau solidaire de l'élément tibial, comme il ressort de l'enseignement du brevet FR 2.696.927. Ces dispositions permettent d'obtenir en combinaison, des mouvements de flexion et de rotation.More particularly, the invention finds a particularly advantageous application, in the case of a total knee prosthesis, which comprises a femoral element receiving a transverse articulation axis mounted with free rotation relative to a cylindrical rod, engaged in a sheath integral with the tibial element, as is apparent from the teaching of the patent FR 2,696,927. These arrangements make it possible to obtain, in combination, flexion and rotation movements.
L'élément tibial comprend une embase recevant un plateau en polyethylene qui est monté avec capacité de déplacement en rotation limité dans un plan horizontal sur ladite embase. Le plateau tibial reçoit en appui, l'élément fémoral avec capacité de flexion angulaire.The tibial element comprises a base receiving a polyethylene plate which is mounted with limited rotational displacement capacity in a horizontal plane on said base. The tibial plateau receives the femoral element in support with angular flexion capacity.
Le plateau fémoral est monté avec capacité de déplacement en rotation limité, par rapport au fourreau solidaire de l'embase tibiale. Dans ce but, le plateau tibial, qui est percé de part en part pour permettre le libre engagement du fourreau, présente une collerette destinée à prendre appui sur une partie déterminée du plateau tibial assurant ainsi son accouplement par rapport à l'embase tibiale.The femoral plate is mounted with limited rotational displacement capacity, relative to the sheath secured to the tibial base. For this purpose, the tibial plateau, which is drilled right through to allow the free engagement of the sheath, has a collar intended to bear on a determined part of the tibial plateau thus ensuring its coupling relative to the tibial base.
A partir de cette conception de base, on a voulu améliorer et faciliter le montage du plateau tibial par rapport à l'embase. En effet, selon les dispositions techniques indiquées précédemment, pour le montage du plateau par rapport à l'embase, il est nécessaire de positionner préalablement le plateau sur l'embase, puis de mettre en place le fourreau, en l'engageant au travers de trous percés respectivement dans l'épaisseur dudit plateau et de ladite embase. La collerette du fourreau vient en appui, comme indiqué, sur une partie correspondante du plateau tibial. On procède ensuite à la fixation du fourreau.From this basic design, we wanted to improve and facilitate the mounting of the tibial plateau relative to the base. Indeed, according to technical provisions indicated above, for mounting the plate relative to the base, it is necessary to first position the plate on the base, then to place the sleeve, engaging it through holes drilled respectively in the thickness of said plate and said base. The collar of the sheath comes to bear, as indicated, on a corresponding part of the tibial plateau. Then we proceed to the fixing of the sheath.
Il apparaît donc que la mise en place du fourreau ne peut être effectuée qu'après avoir positionné le plateau sur l'embase. Autrement dit, il n'est pas possible, selon cette technique antérieure, d'équiper préalablement l'embase tibiale du fourreau destiné à recevoir la tige de l'élément fémoral.It therefore appears that the fitting of the sheath can only be carried out after having positioned the plate on the base. In other words, it is not possible, according to this prior technique, to previously equip the tibial base of the sheath intended to receive the stem of the femoral element.
Le problème que se propose de résoudre l'invention est de pouvoir accoupler facilement et instantanément un plateau tibial par rapport à une embase tibiale équipée d'un fourreau coopérant avec la tige d'articulation de l'élément fémoral, tout en ayant la possibilité de conférer au plateau tibial, un mouvement de rotation limitée par rapport audit fourreau.The problem which the invention proposes to solve is to be able to easily and instantaneously couple a tibial plateau relative to a tibial base fitted with a sheath cooperating with the articulation rod of the femoral element, while having the possibility of give the tibial plateau a limited rotational movement relative to said sheath.
Pour résoudre un tel problème et selon une caractéristique à la base de l'invention, le plateau présente selon son axe de symétrie et à partir de son bord postérieur, une échancrure profilée et épaulée délimitant une entrée étranglée, pour, d'une part être engagée par élasticité autour du fourreau et, d'autre part, être maintenue en position de verrouillage par rapport à une collerette que présente ledit fourreau, tout en ayant un mouvement de liberté en rotation par rapport au fourreau, ladite collerette coopérant avec une zone épaulée formée à partir de l'ouverture de l'entrée étranglée.To solve such a problem and according to a characteristic on the basis of the invention, the plate has along its axis of symmetry and from its rear edge, a profiled and shouldered notch delimiting a constricted entry, for, on the one hand being engaged by elasticity around the sheath and, on the other hand, be held in the locked position relative to a flange presented by said sheath, while having a movement of freedom in rotation relative to the sheath, said flange cooperating with a shouldered area formed from the opening of the constricted entrance.
La zone épaulée est formée à une distance de la base du plateau correspondant sensiblement à la hauteur séparant la face d'appui de l'embase de la face de dessous de la collerette.The shouldered area is formed at a distance from the base of the plate corresponding substantially to the height separating the bearing face of the base from the underside of the flange.
Pour résoudre le problème posé d'assurer l'accouplement du plateau tibial par rapport au fourreau de l'embase, la zone épaulée présente, du côté de l'ouverture de l' échancrure, deux bords parallèles rectilignes qui se raccordent tangentiellement avec un bord demi circulaire en délimitant une zone d'appui pour la collerette.To solve the problem posed of ensuring the coupling of the tibial plate relative to the sheath of the base, the shoulder area has, on the side of the opening of the notch, two parallel rectilinear edges which are tangentially connected with an edge semicircular, delimiting a support area for the collar.
Le problème posé d'assurer la mise en place du plateau tibial par rapport à l'embase et son accouplement par rapport au fourreau de cette dernière, est avantageusement résolu par les caractéristiques suivantes :The problem posed of ensuring the establishment of the tibial plateau relative to the base and its coupling relative to the sheath of the latter, is advantageously resolved by the following characteristics:
- Féchancrure présente, du côté de son ouverture, et en vue de dessus, deux bords rectilignes orientés d'une manière divergente pour se raccorder avec deux segments rectilignes parallèles eux mêmes raccordés au fond de l'échancrure sous forme d'un rebord semi circulaire qui correspond au diamètre du fourreau et s'étend au delà d'une demi circonférence, pour enserrer ledit fourreau et créer un effet de clipage tout en permettant une rotation limitée du plateau.- The notch has, on the side of its opening, and in top view, two rectilinear edges oriented in a divergent manner to be connected with two parallel rectilinear segments themselves connected to the bottom of the notch in the form of a semi circular rim which corresponds to the diameter of the sheath and extends beyond a half circumference, to enclose said sheath and create a clipping effect while allowing limited rotation of the plate.
- l'entrée des deux bords rectilignes divergents présente une largeur inférieure au diamètre du fourreau pour assurer une expansion par élasticité du fond de l'échancrure afin de permettre l'engagement du fourreau sous un effort de pression. L'invention est exposée ci-après plus en détail à l'aide des figures des dessins annexés dans lesquels :- The inlet of the two divergent straight edges has a width less than the diameter of the sheath to ensure elastic expansion of the bottom of the notch in order to allow the engagement of the sheath under a pressure force. The invention is set out below in more detail with the aid of the figures of the appended drawings in which:
- la figure 1 est une vue en perspective de l'implant tibial, avant mise en place du plateau par rapport à l'embase.- Figure 1 is a perspective view of the tibial implant, before placement of the tray relative to the base.
- la figure 2 est une vue en coupe longitudinale de l'implant tibial après accouplement du plateau sur l'embase.- Figure 2 is a longitudinal sectional view of the tibial implant after coupling of the plate on the base.
- la figure 3 est une vue en coupe considérée selon la ligne 3.3 de la figure 2. - la figure 4 est une vue en coupe transversale considérée selon la ligne 4.4 de la figure 3.- Figure 3 is a sectional view taken along line 3.3 of Figure 2. - Figure 4 is a cross-sectional view taken along line 4.4 of Figure 3.
- la figure 5 est une vue en coupe de l'ensemble de la prothèse.- Figure 5 is a sectional view of the entire prosthesis.
Comme indiqué, l'implant tibial, selon les caractéristiques de l'invention trouve une application particulièrement avantageuse dans le cas d'une prothèse totale du genou, du type de celle décrite dans le brevet FR 2696927, dont le demandeur de la présente est également titulaire.As indicated, the tibial implant, according to the characteristics of the invention finds a particularly advantageous application in the case of a total knee prosthesis, of the type described in patent FR 2696927, of which the applicant for this is also holder.
De manière connue, l'implant tibial comprend un plateau en polyethylene (1) et une embase métallique (2). L'embase (2) est équipée d'un fourreau (3) destiné à recevoir une tige solidaire d'un axe transversal que présente l'élément fémoral. Le fourreau (3) est monté du côté postérieur de l'embase tibiale (2). Dans ce but, le fourreau (3) est engagé dans un puits (2a) de l'embase, en y étant fixé par tous moyens connus et appropriés, notamment par soudure. Le fourreau (3) présente à une distance déterminée (d) de la surface d'appui de l'embase tibiale, une collerette d'appui et de butée (3a). Bien évidemment, le fourreau (3) et la collerette (3a) sont de section transversale circulaire afin de faire office d'axe de pivotement au plateau tibial (1) en lui donnant des degrés de liberté de mouvement de rotation, dans un plan horizontal.In known manner, the tibial implant comprises a polyethylene plate (1) and a metal base (2). The base (2) is equipped with a sheath (3) intended to receive a rod secured to a transverse axis presented by the femoral element. The sheath (3) is mounted on the posterior side of the tibial base (2). For this purpose, the sleeve (3) is engaged in a well (2a) of the base, being fixed there by any known and appropriate means, in particular by welding. The sheath (3) has, at a determined distance (d) from the bearing surface of the tibial base, a bearing and abutment collar (3a). Obviously, the sleeve (3) and the collar (3a) are of circular cross section in order to act as a pivot axis at the tibial plateau (1) by giving it degrees of freedom of rotational movement, in a horizontal plane.
Afin de permettre l'accouplement du plateau tibial (1) par rapport à l'embase (2), en autorisant, comme indiqué, des mouvements de rotation limitée du plateau (1) par rapport au fourreau (3), ledit plateau présente du côté de son bord postérieur, une échancrure profilée (la). Cette échancrure profilée (la) délimite une entrée étranglée (lai) pour, d'une part, être engagée par élasticité autour du fourreau (3) et, d'autre part, être maintenue en position de verrouillage, par rapport à la collerette (3 a), tout en ayant un mouvement de liberté en rotation, par rapport audit fourreau.In order to allow the tibial plateau (1) to be coupled with respect to the base (2), by allowing, as indicated, limited rotational movements of the plateau (1) relative to the sheath (3), said plateau has side of its posterior edge, a profiled notch (la). This profiled notch (la) delimits a constricted entry (lai) in order, on the one hand, to be engaged by elasticity around the sheath (3) and, on the other hand, to be held in the locked position, relative to the flange ( 3 a), while having a movement of freedom in rotation, with respect to said sheath.
L'échancrure profilée (la) présente du côté de son ouverture (la2), une zone épaulée (la3) pour l'engagement de la collerette (3a) du fourreau. La zone épaulée (la3) est formée à une distance (dl) par rapport à la base du plateau, correspondant très sensiblement, à la distance (d) séparant, comme indiqué précédemment, la base d'appui de l'embase (2) de la face de dessous de la collerette (3a).The profiled notch (la) has on the side of its opening (la2), a shouldered zone (la3) for the engagement of the collar (3a) of the sleeve. The shoulder area (la3) is formed at a distance (dl) from the base of the plate, corresponding very substantially to the distance (d) separating, as indicated above, the support base from the base (2) from the underside of the collar (3a).
La zone épaulée (la3) présente, du côté de l'ouverture (la2) de l'échancrure (la), deux bords parallèles rectiligne (a) (b) qui se raccordent tangentiellement avec un bord demi circulaire (c) en délimitant une zone d'appui (la4) pour la collerette (3a).The shoulder area (la3) has, on the side of the opening (la2) of the notch (la), two parallel straight edges (a) (b) which are tangentially connected with a semi-circular edge (c) delimiting a support area (la4) for the collar (3a).
Par ailleurs, l'échancrure (la) présente, toujours du côté de son ouverture (la2) et en vue de dessus, correspondant à la face d'appui et de glissement du plateau tibial, deux bords rectilignes (d) (e), orientés de manière divergente pour se raccorder avec deux segments rectilignes parallèles (f) et (g) eux mêmes raccordés au fond (la5) de l'échancrure sous forme d'un rebord semi-circulaire qui correspond au diamètre du fourreau et qui s'étend au delà d'une demi circonférence.Furthermore, the notch (la) has, still on the side of its opening (la2) and in top view, corresponding to the bearing and sliding face of the tibial plateau, two straight edges (d) (e), divergently oriented to connect with two straight segments parallel (f) and (g) themselves connected to the bottom (la5) of the notch in the form of a semi-circular rim which corresponds to the diameter of the sheath and which extends beyond a half circumference.
Les deux bords rectilignes (f) et (g) présentent une largeur (1) inférieure au diamètre du fourreau (3) pour assurer une expansion par élasticité du fond (la5) de l'échancrure, afin de permettre l'engagement dudit fourreau (3) sous un effort de pression. On rappelle que le fond (la5) de la gorge (la) dans lequel est positionné en appui le fourreau (3), délimite un bord semi circulaire s'étendant au delà d'une demi circonférence.The two rectilinear edges (f) and (g) have a width (1) less than the diameter of the sheath (3) to ensure elastic expansion of the bottom (la5) of the notch, in order to allow the engagement of said sheath ( 3) under pressure. Recall that the bottom (la5) of the groove (la) in which is positioned in support the sheath (3), delimits a semi-circular edge extending beyond a half circumference.
Ces dispositions permettent d'enserrer la section transversale du fourreau (3), en créant un effet de clipage. Le diamètre du fourreau (3) et le diamètre du fond de gorge (la5) sont déterminés pour créer un jeu fonctionnel permettant une rotation limitée du plateau (1) par rapport audit fourreau.These provisions allow to enclose the cross section of the sleeve (3), creating a clipping effect. The diameter of the sheath (3) and the diameter of the groove bottom (la5) are determined to create a functional clearance allowing limited rotation of the plate (1) relative to said sheath.
Compte tenu de ces caractéristiques, il est donc possible de prééquiper l'embase tibiale (2) du fourreau (3) équipé de sa collerette de verrouillage (3 a).Given these characteristics, it is therefore possible to pre-equip the tibial base (2) with the sheath (3) equipped with its locking collar (3a).
Il suffit ensuite d'engager par glissement le plateau tibial (1) sur l'embase (2), de manière à engager l'échancrure (la) sur le fourreau (3) dont la collerette (3 a) vient en appui sur la zone épaulée semi circulaire (la3), la section dudit fourreau étant engagée dans le fond de l'échancrure (la5). Comme indiqué, l'engagement du plateau par rapport au fourreau a pour effet, au moment de l'introduction, d'écarter l'échancrure afin de permettre l'engagement dudit fourreau puis, après avoir franchi la zone rétrécie (f-g), son relâchement par élasticité, afin de se refermer de manière concomitante sur la section transversale dudit fourreau, obtenant ainsi, de manière connue, un effet de clipage.It then suffices to slide the tibial plateau (1) onto the base (2), so as to engage the notch (la) on the sheath (3), the flange (3 a) of which rests on the semi-circular shouldered area (la3), the section of said sheath being engaged in the bottom of the notch (la5). As indicated, the engagement of the plate relative to the sheath has the effect, at the time of the introduction, of spreading the notch in order to allow the engagement of said sheath then, after having crossed the zone narrowed (fg), its relaxation by elasticity, in order to close concomitantly on the cross section of said sheath, thus obtaining, in known manner, a clipping effect.
Bien évidemment, les dispositions telles que définies précédemment, s'appliquent à tous types de prothèses du genou, la surface d'appui de l'embase tibiale recevant le plateau, pouvant être entièrement lisse ou présenter éventuellement des aspérités.Obviously, the provisions as defined above apply to all types of knee prostheses, the bearing surface of the tibial base receiving the plate, which may be entirely smooth or possibly have roughness.
Les avantages ressortent bien de la description, en particulier on souligne et on rappelle la possibilité d'accoupler le plateau tibial par rapport à l'embase tibiale préalablement équipée d'un fourreau qui assure une liaison avec l'élément fémoral, tout en permettant une rotation limitée dans un plan horizontal, du plateau tibial. The advantages emerge clearly from the description, in particular it underlines and recalls the possibility of coupling the tibial plateau relative to the tibial base previously equipped with a sheath which ensures a connection with the femoral element, while allowing a limited rotation in a horizontal plane of the tibial plateau.

Claims

R E V E N D I C A T I O N SR E V E N D I C A T I O N S
-1- Implant tibial pour prothèse du genou comprenant une embase tibiale métallique (2) recevant un plateau tibial en polyethylene (1), ladite embase (2) étant équipée d'un fourreau tabulaire (3) pour l'engagement et le guidage d'un doigt articulé sur une partie d'un implant fémoral destiné à coopérer avec le plateau tibial notamment, caractérisé en ce que le plateau (1) présente selon son axe de symétrie et à partir de son bord postérieur, une échancrure profilée et épaulée (la) délimitant une entrée étranglée (lai), pour, d'une part être engagée par élasticité autour du fourreau (3) et, d'autre part, être maintenue en position de verrouillage par rapport à une collerette (3 a) que présente ledit fourreau, tout en ayant un mouvement de liberté en rotation par rapport au fourreau (3), ladite collerette (3a) coopérant avec une zone épaulée (la3) formée à partir de l'ouverture de l'entrée étranglée (lai).-1- Tibial implant for knee prosthesis comprising a metal tibial base (2) receiving a tibial polyethylene plate (1), said base (2) being fitted with a tabular sheath (3) for engagement and guidance of '' a finger articulated on a part of a femoral implant intended to cooperate with the tibial plateau in particular, characterized in that the plateau (1) has, along its axis of symmetry and from its posterior edge, a profiled and shouldered notch ( la) delimiting a throttled entry (lai), for, on the one hand to be engaged by elasticity around the sheath (3) and, on the other hand, to be maintained in the locked position relative to a flange (3 a) that has said sheath, while having a freedom of movement in rotation relative to the sheath (3), said flange (3a) cooperating with a shoulder area (la3) formed from the opening of the constricted inlet (lai).
-2- Implant selon la revendication 1 , caractérisé en ce que la zone épaulée (la3) est formée à une distance de la base du plateau correspondant sensiblement à la hauteur séparant la face d'appui de l'embase de la face de dessous de la collerette (3 a).-2- Implant according to claim 1, characterized in that the shoulder area (la3) is formed at a distance from the base of the plate corresponding substantially to the height separating the bearing face of the base from the face below the collar (3a).
-3- Implant selon la revendication 1, caractérisé en ce que la zone épaulée (la3) présente, du côté de l'ouverture de l'échancrure, deux bords parallèles rectilignes qui se raccordent tangentiellement avec un bord demi circulaire (c) en délimitant une zone d'appui (la4) pour la collerette (3a). -4- Implant selon la revendication 1, caractérisé en ce que l'échancrure présente, du côté de son ouverture, et en vue de dessus, deux bords rectilignes (d) et (e) orientés d'une manière divergente pour se raccorder avec deux segments rectilignes parallèles (f) et (g) eux-mêmes raccordés au fond (la5) de l'échancrure sous forme d'un rebord semi-circulaire qui correspond au diamètre du fourreau, et qui s'étend au-delà d'une demi- circonférence, pour enserrer ledit fourreau (3) et créer un effet de clipage tout en permettant une rotation limitée du plateau (1).-3- Implant according to claim 1, characterized in that the shoulder area (la3) has, on the side of the opening of the notch, two straight parallel edges which are tangentially connected with a semi-circular edge (c) delimiting a support area (la4) for the collar (3a). -4- Implant according to claim 1, characterized in that the notch has, on the side of its opening, and in top view, two straight edges (d) and (e) oriented in a diverging manner to be connected with two parallel rectilinear segments (f) and (g) themselves connected to the bottom (la5) of the notch in the form of a semi-circular rim which corresponds to the diameter of the sheath, and which extends beyond a half circumference, to enclose said sheath (3) and create a clipping effect while allowing limited rotation of the plate (1).
-5- Implant selon la revendication 4, caractérisé en ce que l'entrée des deux bords rectilignes (f) et (g) présente une largeur inférieure au diamètre du fourreau (3) pour assurer une expansion par élasticité du fond de l'échancrure afin de permettre l'engagement du fourreau sous un effort de pression. -5- Implant according to claim 4, characterized in that the entry of the two rectilinear edges (f) and (g) has a width less than the diameter of the sheath (3) to ensure elastic expansion of the bottom of the notch in order to allow the engagement of the sheath under a pressure force.
PCT/FR1998/002433 1997-11-24 1998-11-16 Tibial implant for knee prosthesis WO1999026561A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98955659A EP1033948A1 (en) 1997-11-24 1998-11-16 Tibial implant for knee prosthesis

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9714962A FR2771283B1 (en) 1997-11-24 1997-11-24 TIBIAL IMPLANT FOR KNEE PROSTHESIS
FR97/14962 1997-11-24

Publications (1)

Publication Number Publication Date
WO1999026561A1 true WO1999026561A1 (en) 1999-06-03

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Application Number Title Priority Date Filing Date
PCT/FR1998/002433 WO1999026561A1 (en) 1997-11-24 1998-11-16 Tibial implant for knee prosthesis

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EP (1) EP1033948A1 (en)
FR (1) FR2771283B1 (en)
WO (1) WO1999026561A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10058372A1 (en) * 2000-11-24 2002-06-06 Mathys Medizinaltechnik Ag Bet joint prosthesis

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6485519B2 (en) * 2001-01-29 2002-11-26 Bristol-Myers Squibb Company Constrained prosthetic knee with rotating bearing
US6719800B2 (en) 2001-01-29 2004-04-13 Zimmer Technology, Inc. Constrained prosthetic knee with rotating bearing
FR2835178B1 (en) * 2002-01-31 2004-12-03 Jacques Marie Rousseau TIBIAL PROSTHETIC ASSEMBLY FOR SLIDING KNEE PROSTHESIS
ES2385896T3 (en) * 2005-05-09 2012-08-02 Aesculap Ag Knee Endoprosthesis

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2452412A1 (en) * 1974-11-05 1976-05-06 Karl Dr Med Tillmann Completely internal, low friction, artificial knee joint - without hinges, with double guide means and with travelling axis of rotation
US4216549A (en) * 1977-06-02 1980-08-12 Purdue Research Foundation Semi-stable total knee prosthesis
FR2692475A1 (en) * 1992-06-19 1993-12-24 Montpellier Chirurgie Total knee replacement.
FR2696927A1 (en) * 1992-10-20 1994-04-22 Implants Instr Ch Fab Total knee prosthesis - has femoral component able to rotate freely in relation to cylindrical rod in vertical sleeve by means of bearing rollers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2452412A1 (en) * 1974-11-05 1976-05-06 Karl Dr Med Tillmann Completely internal, low friction, artificial knee joint - without hinges, with double guide means and with travelling axis of rotation
US4216549A (en) * 1977-06-02 1980-08-12 Purdue Research Foundation Semi-stable total knee prosthesis
FR2692475A1 (en) * 1992-06-19 1993-12-24 Montpellier Chirurgie Total knee replacement.
FR2696927A1 (en) * 1992-10-20 1994-04-22 Implants Instr Ch Fab Total knee prosthesis - has femoral component able to rotate freely in relation to cylindrical rod in vertical sleeve by means of bearing rollers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10058372A1 (en) * 2000-11-24 2002-06-06 Mathys Medizinaltechnik Ag Bet joint prosthesis
DE10058372C2 (en) * 2000-11-24 2003-01-09 Mathys Medizinaltechnik Ag Bet joint prosthesis

Also Published As

Publication number Publication date
EP1033948A1 (en) 2000-09-13
FR2771283A1 (en) 1999-05-28
FR2771283B1 (en) 2000-03-03

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