FR2696091A1

FR2696091A1 - Lock for shaft and screw of pedicular spinal implant - comprises male and female portions, engaging each other by relative longitudinal sliding, securing longitudinal shaft against screw head

Info

Publication number: FR2696091A1
Application number: FR9211935A
Authority: FR
Original assignee: BRUGUIER PIERRE MARIE
Current assignee: BRUGUIER PIERRE MARIE
Priority date: 1992-09-29
Filing date: 1992-09-29
Publication date: 1994-04-01

Abstract

A connecting shaft (4) is locked into a rectangular support block (1) which defines the head end of a pedicular implant screw (2). The upper face of the implant screw head has a longitudinal groove (3), and its lateral edges define a pair of tenons (5) running along its whole length. A cap (6) secures the shaft against the groove. The inner surface of the cap includes a groove of part-circular cross-section, and a pair of lateral channels (8) which cooperate in a sliding manner with the tenons of the screw head. A screw (9) passes through the cap to secure it against the head. ADVANTAGE - Rapid securing with degree of longitudinal adjustment to suit different patients.

Description

IMPLANT PEDICULAIRE à BLOQUAGE par
GLISSIERE. (I.P.G.)
La présente invention concerne la création d'un dispositif permettant de bloquer une tige reliant des implants pédiculaires entre eux.LOCKING PEDICULAR IMPLANT by
SLIDE. (IPG)
The present invention relates to the creation of a device for blocking a rod connecting pedicle implants together.

Jusque là on utilisait généralement des
appareils qui par différents systèmes de vissage: vis-pointeau, écrou, etc... comprimaient dans une tête de vis en -U- la tige qui relie les vis entre elles.Until now, we generally used
devices which by different screwing systems: needle screw, nut, etc ... compressed in a head of screw in -U- the rod which connects the screws between them.

Le système utilisé ici supprime tous les problèmes du vissage sous toutes ses différentes formes en offrant un bloquage total de la tige par l'intermédiaire de tenons dans une glissière. The system used here eliminates all the problems of screwing in all its different forms by offering total blocking of the rod by means of tenons in a slide.

Construit dans un matériau homologué conçu à cet effet, il peut s'adapter à tous les besoins de la tenue d'une tige d'union de diamètre couramment utilisé dans ces cas. Built in an approved material designed for this purpose, it can adapt to all the needs of holding a union rod of diameter commonly used in these cases.

Ce dispositif se compose d'un support de tige tiré d'un parrallélépipède rectangle (1) qui a, en sa base et en son axe vertical, le départ du corps de vis de l'implant (2) qui se visse dans le pédicule de la vertèbre. This device consists of a rod support drawn from a rectangular parallelepiped (1) which has, at its base and in its vertical axis, the start of the implant screw body (2) which screws into the pedicle of the vertebra.

Ce parrallélépipède (t) est traversé en-.sa partie supérieure dans le sens de sa longueur par une "gouttière" (3) de diamètre correspondant en partie au diamètre de la tige d'union (4). This parallelepiped (t) is crossed en-.sa upper part in the direction of its length by a "gutter" (3) of diameter corresponding in part to the diameter of the union rod (4).

De part et d'autre de ce logement et toujours en sa partie supérieure le parrallélépipède s'élargit pour former sur ses deux cotés dans le sens de sa longueur, deux tenons mâles (5). On both sides of this housing and still in its upper part the parrallélépipède widens to form on its two sides in the direction of its length, two male studs (5).

Le corps de cet implant (Fig.3) ainsi fabriqué recevra dans la gouttière (3) la tige d'union (4) qui reliera entre eux les implants. The body of this implant (Fig. 3) thus produced will receive in the gutter (3) the union rod (4) which will connect the implants to each other.

Pour bloquer cette tige (4) dans son logement une pièce parrallélépipédique, après sa mise en forme pour épouser la forme de la tête de l'implant (i) la chevauchera. To block this rod (4) in its housing, a parallelepipedal part, after its shaping to match the shape of the head of the implant (i) will overlap it.

Ce chapeau (6) en la partie centrale de sa face inférieure qui s'applique sur la face supérieure de (t) est traversée dans sa largeur par une saignée en arc de cercle (7) qui formera la partie supérieure de la gouttière (3) et qui la fermera une fois le chapeau (6) en place. This cap (6) in the central part of its lower face which applies to the upper face of (t) is crossed across its width by a groove in an arc (7) which will form the upper part of the gutter (3 ) and which will close it once the cap (6) is in place.

De part et d'autre de cet arrondi, deux rainures (8) correspondantes aux dimensions des tenons mâles (5) de l'implant (1) seront taillées dans les flancs du chapeau (6) formant ainsi les glissières (8). On either side of this rounding, two grooves (8) corresponding to the dimensions of the male studs (5) of the implant (1) will be cut in the sides of the cap (6) thus forming the slides (8).

Une fois le pied de l'implant (2) vissé dans le pédicule, la tige d'union (4) placée dans la gorge (3), on glissera le long de cette tige le chapeau (6) en encastrant dans ses deux rainures (8) les tenons mâles (5) du pied de l'implant (t). Once the implant foot (2) screwed into the pedicle, the union rod (4) placed in the groove (3), we will slide along this rod the cap (6) by fitting into its two grooves (8) the male studs (5) of the implant foot (t).

Une vis (9) vissée perpendiculairement dans le corps du chapeau (6) et dans un des tenons mâles (5) rendra solidaire la partie supérieure de l'implant (6) de son embase (1) ce qui bloquera parfaitement la tige d'union (4) dans sa gorge (3). A screw (9) screwed perpendicularly in the body of the cap (6) and in one of the male studs (5) will make the upper part of the implant (6) integral with its base (1) which will perfectly block the stem. union (4) in its throat (3).

L'invention trouve donc une application particulièrement adaptée au bloquage des tiges d'union utilisées en chirurgie, elle n'est nullement limitée aux exemples décrits, mais au contraire couvre toutes les variantes d'exécution ou d'adaptation./. The invention therefore finds an application particularly suitable for blocking the connecting rods used in surgery, it is by no means limited to the examples described, but on the contrary covers all variants of execution or adaptation.

Claims

CLAIMS.

- 1 -) Device for locking a rod (4) in a rectangular parallelepipedic support (1) forming the head of a pedicle implant (2) the upper face of which is cut out of a gutter (3) in the direction of its length, and whose sides in the width direction over this entire length are provided with male studs (5).

- 2 -) Device according to claim -1- characterized in that the rod (4) is blocked by a cap (6) forming the upper part of the lower part of the implant (1) whose lower face is in contact with the upper face of the implant (t) receives over its entire width a groove in an arc (7) corresponding to the part of the rod (4) projecting from the upper face of the implant (1). The inner sides of this cap (6) will be cut with two grooves (8) intended during the overlap of (6) on (1) to receive the male studs (5) of the implant (1) thus forming the slides.

- 3 -) Device according to either of claims 1 and 2, characterized in that the upper part, the cap (6) sliding through its grooves (8) along the male studs ( 5) will lock in its housing (3) the union rod (4).

- 4 -) Device according to claim 1, 2, 3, characterized in that the screw (9) screwed into the cap (6) and into one of the male studs (5) will make the upper part of the implant (6) ) from the lower part (t).

- 5 -) Application of the device according to any one of claims 1 to 4 to blocking by means of a slide rod union. /.