A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
A61F 2/44 (2006.01)
Patent
CA 2592451
A modular intervertebral implant (1), particularly an artificial intervertebral disk having a central axis (2) and comprising a first and a second component (3; 4) being mutually connectable in a ball-joint like manner, whereby A) the first component (3) is provided with an apposition area (5) which is apt for abutment to an end plate of a first adjoining vertebral body, said first component (3) being further provided with a concave spherical articulation surface (9) which has a radius R; B) the second component (4) is provided with an apposition area (6) which is apt for abutment to an end plate of a second adjoining vertebral body, said second component (4) being further provided with a convex spherical articulation surface (10) having the same radius R as the concave spherical articulation surface (9); C) the first component (3) has a maximum height H1 and the second component (4) has a maximum height H2, such that a maximum overall height H < (H1 + H2) results for the assembled intervertebral implant (1); and D) said intervertebral implant (1) has a centre of rotation RZ which has a shortest distance A to the second apposition area (6), said shortest distance A being equal to the absolute value of (H2 - R); and whereby E) the first component (3) is selected from a first kit of at least M >= 2 first components (3) with different maximum heights H1; and F) the second component (4) is selected from a second kit of at least N >= 2 second components (4) with different maximum heights H2; such permitting G) a selection of the distance A of the centre of rotation RZ of the so assembled intervertebral implant (1).
La présente invention concerne un implant intervertébral modulaire (1), en particulier un disque intervertébral artificiel ayant un axe central (2) et comprenant un premier et un second composants (3 ; 4) pouvant être reliés l~un à l~autre à la manière d~un joint à rotule, moyennant quoi A) le premier composant (3) est muni d~une zone d~apposition (5) conçue pour être aboutée à une plaque d~extrémité d~un premier corps vertébral attenant, ledit premier composant (3) étant en outre muni d~une surface d~articulation sphérique concave (9) ayant un rayon R ; B) le second composant (4) est muni d~une zone d~apposition (6) conçue pour être aboutée à une plaque d~extrémité d~un second corps vertébral attenant, ledit second composant (4) étant en outre muni d~une surface d~articulation sphérique convexe (10) ayant le même rayon R que la surface d~articulation sphérique concave (9) ; C) le premier composant (3) a une hauteur maximum H1 et le second composant (4) une hauteur maximum H2 telles qu~il en résulte une hauteur globale maximum H < (H1 + H2) pour l~implant intervertébral assemblé (1) et D) ledit implant intervertébral (1) a un centre de rotation RZ qui a une distance la plus courte A jusqu~à la seconde zone d~apposition (6), ladite distance la plus courte A étant égale à la valeur absolue de (H2 - R), et moyennant quoi E) le premier composant (3) est sélectionné dans un premier jeu d~au moins M >= 2 premiers composants (3) ayant des hauteurs maximum H1 différentes et F) le second composant (4) est sélectionné dans un second jeu d~au moins N >= 2 seconds composants (4) ayant des hauteurs maximum H2 différentes, permettant ainsi G) une sélection de la distance A du centre de rotation RZ de l~implant intervertébral (1) ainsi assemblé.
Frigg Robert
Lechmann Beat
Osler Hoskin & Harcourt Llp
Synthes Gmbh
Synthes Usa Llc
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