FR2841124A1 - REVERSIBLE INTERSOMATIC CAGE AND ITS DEVICE FOR PLACING BETWEEN THE VERTEBRAL BODIES OF A SPINE - Google Patents

Abstract

The reversible interbody cage for the fusion of vertebral bodies of the overlying and underlying vertebrae (VS, VI) of a vertebral column according to the present invention comprises a body (2) consisting of upper (4) and lower (5) edges provided with teeth (10), of curved lateral faces (6, 7) of which at least one and more particularly that having the smallest radius of curvature of holes (11, 12) emerging inside an internal space (3 ) for the establishment of a bone graft, a front face (8) with rounded profile crossed in a vertical direction by a first marker (17) and a rear face (9) planar pierced with a bore (13) intended to cooperate with a positioning tool (14), said rear face (9) being traversed in a horizontal direction by a second marker (18).

Description

in said side wall (5).

28411 24

REVERSIBLE INTERSOMATIC CAGE AND

  ITS POSITIONING DEVICE BETWEEN

THE VERTEBRAL BODIES OF A COLUMN

SPINAL

  The present invention relates to a reversible interbody cage and more particularly to a device for placing said cage between the bodies.

  vertebral column.

  Also, the present invention relates to a follower rod allowing the

  tracking of the interbody cage during the surgical operation.

  The reversible interbody cage for the fusion of vertebral bodies of the vertebrae above and below a vertebral column according to the present invention comprises a body constituted by upper and lower edges provided with teeth, with curved lateral faces of which at least one and more in particular that presenting the smallest radius of curvature of holes emerging inside an internal space for the installation of a bone graft, of a front face with rounded profile crossed in a vertical direction by a first marker and d 'a flat rear face pierced with a bore intended to cooperate with a positioning tool, said rear face being crossed in a horizontal direction by a

second marker.

  The intersomatic cage according to the present invention comprises a body which is

  realized in a translucent radio material.

  The intersomatic cage according to the present invention comprises a body which is

  realized in a translucent radio material such as PEEK.

  The intersomatic cage according to the present invention comprises a body which comprises at the junction between the curved lateral faces with the face

back two notches.

  The interbody cage according to the present invention comprises a first marker which is positioned vertically in front of the interbody cage and

  center on the main axis of this behind.

  The intersomatic cage according to the present invention comprises a second marker which is positioned in a horizontal direction and offset relative to

  to the main axes of the rear face of the interbody cage.

  The interbody cage according to the present invention comprises markers which form in a cylindrical wire passing right through the interbody cage and which are produced in a radio opaque material susceptible

28411 24

  to be visible during an x-ray so as to allow the position of the intersomatic cages to be visualized with respect to each other and to the bodies

  vertebral vertebrae above and below a vertebral column.

  The intersomatic cage according to the present invention has upper and lower edges which respectively comprise on either side of the internal space of the teeth with inclined profile which wind directed towards the rear face of the body. The device for setting up an intersomatic cage according to the present invention comprises a tool which consists of a gripping handle secured to a tube and assembly means for fixing a follower rod to

inside the tube.

  The positioning device according to the present invention comprises assembly means which consist of a rod guided inside the bore of the tube, of a wheel allowing the rotational drive of the rod, and a hexagonal profile provided in the bore of said tube for locking the rotation of the rod

follower inside the tube.

  The positioning device according to the present invention comprises a handle comprising a housing inside which rotates the wheel in order to drive the rod inside the bore of the tube, said housing being closed at

  above the wheel by a plate forming a striking zone on the tool.

  The positioning device according to the present invention comprises a follower rod comprising a threaded part and opposite this behind a profile

  hexagonal or the like extending by a threaded end.

  The positioning device according to the present invention comprises a tube

  comprising opposite the handle of the pins.

  The positioning device according to the present invention comprises a tube comprising in its internal part a first bore which is extended by a

  second bore whose internal diameter is smaller than that of the first.

  The following description with reference to the accompanying drawings, given as

  non-limiting examples, will better understand the invention, the features it presents and the advantages it is likely to provide: Figure 1 is a perspective view illustrating the interbody cage according to the

present invention.

  Figure 2 is a view showing the vertebral bodies of the vertebrae above and below a vertebral column viewed from the front between which the wind introduces the

  intersomatic cages according to the present invention.

28411 24

  Figure 3 is a view showing the vertebral bodies of the vertebrae above and below a vertebral column viewed in profile between which wind introduced the

  intersomatic cages according to the present invention.

  Figure 4 is a perspective view showing the device or [instrumentation for

  the establishment of the interbody cage.

  Figure 5 is a perspective view showing a follower rod allowing the mechanical connection between the interbody cage and the positioning device

according to the present invention.

  Figure 6 is a sectional view illustrating the operating head of the setting device

  in place according to the present invention.

  Figure 7 is a sectional view showing the attachment of the follower rod to the end

  of the positioning device according to the present invention.

  Figures 8 and 9 are views representing the interbody cage mounted on the

  positioning device according to the present invention.

  We have shown in Figure 1 an intersomatic cage 1 having a curved profile

  to affect, for example, the shape of half a banana.

  The interbody cage 1 is made up of a body 2 made of a translucent radio material, that is to say, it is not visible during radiological shots. The material used can be, for example, because of its technical and physical characteristics, a material sold under the name

from PEEK.

  The intersomatic cage 1 is constituted by a body 2 having in its middle a through space 3 intended to receive, for example, a bone graft which is not represented. The body 2 has upper 4 and lower 5 edges, curved side faces 6, 7 joined together by a front face 8 with a rounded profile and a face

  flat rear 9, the whole delimiting the internal space 3.

  The upper 4 and lower 5 edges respectively comprise on each side of the internal space 3 teeth 10 with an inclined profile which are directed towards the face

rear 9 of body 2 of cage 1.

  The profile of the teeth 10 is provided to constitute a retaining element for the interbody cage 1 between the vertebral bodies of the vertebrae above and below VS,

Vl of a spine.

28411 24

  The lateral face 6 forming the internal face to the radius of curvature of the body 2 in the form of a half banana is pierced with two holes 11 and 12 opening out inside the internal space 3. In fact, the other lateral face 7 constitutes the external face to the ray

  of curvature of the body 2 in the form of a half banana.

  The rear face 9 is pierced with a threaded bore 13 which is intended to cooperate with a tool 14 for the introduction and manipulation of the interbody cage 1 between the vertebral bodies of the above and underlying vertebrae VS, Vl of a column vertebrale. The threaded bore 13 is provided to open up inside the internal space 3 of the

  body 2 of the interbody cage 1.

  The body 2 comprises, at the junction between the lateral faces 6, 7 with the rear face 9 and on either side of the bore 13, two notches 15 and 16 opening out or not inside the space internal 3 of body 2 of cage

intersomatic 1.

  The body 2 of the intersomatic cage 1 comprises at the front face 8 a first marker 17 has in a vertical direction and at the rear face 9 a second marker 18 placed in a horizontal direction and

perpendicular to the first.

  The first marker 17 is positioned at the front of the interbody cage 1 and centers on the main exe of the latter so that the distance between the

  internal and external sides is identical.

  The second marker 18 is positioned in a horizontal direction which is offset relative to the main axes of the rear face 9 or of the threaded bore

13 of the intersomatic cage 1.

  The offset of the second marker 18 on the rear face 9 allows the radiographic location between the right and left interbody cage during a view of

  face of a patient's spine (Figure 2).

  In fact, the interbody cage 1 according to the present invention is reversible, that is to say, the tail is likely to be implanted between the vertebral bodies on the right and

  to the left of the vertical axis passing through the vertebrae of the spine.

  Also during a profile view the position of markers 17 and 18 between the two interbody cages 1 implanted between the vertebral bodies VS, Vl allows

  to check the respective penetration of the two cages between them (Figure 3).

  Note that in the side view the intersomatic cage 1 on the right is that presenting the marker 18 in the high position, while the intersomatic cage 1 on the left is identified by the marker 18 being in the lowest position

28411 24

  This positioning on the right and left of the intersomatic cage 1 is obtained by a simple rotation of this behind around its longitudinal axis so that each internal face 6 of smaller radius of curvature is always arranged one

opposite each other.

  Markers 17, 18 are made from a cylindrical or other form of wire

  geometrical crossing right through the intersomatic cage 1.

  The markers 17, 18 are made of a material capable of being visible during an X-ray image so as to allow the position of the intersomatic cages 1 to be viewed with respect to each other and with respect to the vertebral bodies of the

  above and below vertebrae VS, Vl of a vertebral column.

  Indeed, it is generally introduced between the vertebral bodies of the above and underlying vertebrae VS, Vl of a vertebral column two intersomatic cages 1 which are positioned relative to each other so that the lateral faces

  internal 6 solent arranged one opposite the other.

  Thus, the markers 17 and 18 make it possible to verify the position of the two cages with respect to each other and to identify the right cage of the left cage when they are introduced between the vertebral bodies of the vertebrae above and below

  adjacent VS, Vl of a spine (Figures 2, 3).

  It is noted that during a front view of the spine it is placed between the vertebral bodies of the vertebrae above and below VS, Vl a cage 1 on the right

  and a cage to the left of the vertical axis of said spine.

  Thus, the intersomatic cage 1 cited on the right is identified by the position of the markers 17, 18 of which the second 18 is located above the threaded bore 13

  household in the rear face 9 (figure 2).

  The intersomatic cage 1 cited on the left is identified by the position of the markers 17, 18 of which the second 18 is located below the threaded bore 13

  household in the rear face 9 (figure 2).

  Thus, it can be seen that the interbody cage 1 is reversible so as to be positioned either on the right or on the left and between the vertebral bodies of the overlying and underlying vertebrae VS, Vl of a vertebral column. A tool 14 is represented in FIGS. 4 to 7 allowing the introduction and the introduction of the interbody cage 1 between the vertebral bodies of the above and underlying vertebrae VS, Vl of a vertebral column by means of a rod

follower 21.

28411 24

  The tool 14 consists of a gripping handle 19 integral with a tube 20 comprising in its internal part a first bore 31 which is extended by a

  second bore 32 whose internal diameter is smaller than that of the first.

  The handle 19 has a housing 22 inside which rotates a

  wheel 23 in order to drive inside the bore 31 of the tube 20 a rod 24.

  The housing 22 is closed above the wheel 23 by a plate 25 forming

a striking zone on the tool 14.

  The tube 20 has, opposite the handle 19, lugs 26, while its

  the internal bore 32 has a part 33 with a hexagonal profile or the like.

  The rod 24 is fixed to the wheel 23 by means of a clamping screw 34,

  while it has a threaded bore 27 opposite the wheel 23.

  The follower rod 21 has a threaded portion 28 and opposite it

  a hexagonal profile or the like 29 extending by a threaded end 30.

  We have shown in Figures 6 to 7 the tool 14 which carries the end opposite to that of the

  handle 19 an interbody cage 1.

  The follower rod 21 is assembled in such a way that its threaded end 30

  cooperates with the threaded bore 13 provided in the rear face 9 of the body 2.

  The follower rod 21 is rotated by means of the hexagonal profile 29 so that the interbody cage 1 is perfectly maintained at the end of this behind. Then the follower rod 21 is assembled to the tool 14 so that its threaded part 28 cooperates with the threaded bore 27 of the rod 24. The fixing of the follower rod 21 is obtained by the rotationally driven rod 24 by the wheel

  23 located at the handle 19 of the tool 14.

  The rotation of the rod 24 makes it possible to introduce the follower rod 21 inside the internal bore 32 of the tube 20 until the hexagonal profile 29 cooperates with

  the part with complementary profile 33 to said tube.

  The translational displacement of the follower rod 21 inside the tube 20 is carried out until the pins 26 penetrate inside the notches 15 and 16

  provided at the rear face 9 of the interbody cage 1 (Figures 8, 9).

  The cooperation of the pins 26 of the tube 20 with the notches 15, 16 of the interbody cage 1 allows the locking in rotation of the follower rod 21 inside

audit tube.

28411 24

  Thus, the surgeon can introduce between the vertebral bodies of the vertebrae above and underlying VS, Vl of a vertebral column the first interbody cage 1 a

[using tool 14.

  This introduction can for example be formed by successive strikes carried out using a hammer on the plate 25 without risk of blocking the threaded parts of the tool 14 with the follower rod 21 and this behind with the cage

intersomatic 1.

  As soon as the first interbody cage 1 is introduced, the surgeon withdraws the tool 14 by rotating the wheel 23 to release the follower rod 21 blocked in rotation by the complementary profiles 29, 33 of the rod 24 guided inside.

of tube 20.

  After removing the tool 14, it can be seen that the follower rod 21 remains assembled with the first intersomatic cage 1. Thus, the surgeon can visually identify the position of the intersomatic cage 1 between the vertebral bodies of the overlying and underlying vertebrae VS , Vl of a spine thanks to the rod

  follower who leaves the operating field.

  Also, the surgeon can act on the follower rod 21 to change the position of the interbody cage 1 between the vertebral bodies of the overlying and underlying vertebrae VS, Vl of a vertebral column thanks to the follower rod which leaves the

operating field.

  The follower rod 21 is removed from the interbody cage 1 by means of its profile

  hexagonal 29 which allows it to be rotated by any tool.

  It should moreover be understood that the foregoing description has been given only

  By way of example and that it in no way limits the field of the invention from which one would not go in replacement, cant the details of executions described by any other equivalent. <:::

28411 24

t

Claims (8)

  1. Reversible intersomatic cage for the fusion of vertebral bodies of the overlying and underlying vertebrae (VS, Vl) of a vertebral column, characterized in that it comprises a body (2) consisting of upper (4) and lower edges ( 5) provided with teeth (10), with curved lateral faces (6, 7) of which at least one and more particularly that having the smallest radius of curvature of holes (11, 12) emerging inside a internal space (3) for the establishment of a bone graft, a front face (8) with rounded profile crossed in a vertical direction by a first marker (17) and a rear face (9) pierced plane a bore (13), said rear face (9) being   crossed in a horizontal direction by a second marker (18).   2. intersomatic cage according to claim 1, characterized in that the   body (2) is made of a radio translucent material.   - :: 3. An intersomatic cage according to claim 1, characterized in that the   body (2) is made of a radio translucent material such as PEEK.   4. intersomatic cage according to claim 1, characterized in that the body (2) comprises at the junction between the curved lateral faces   (6, 7) with the rear face (9) two notches (15, 16).   5. interbody fusion cage according to claim 1, characterized in that the first marker (17) is positioned vertically at the front of the cage   intersomatic (1) and center on the main axis of this behind.   : 6. intersomatic cage according to claim 1, characterized in that the second marker (18) is positioned in a horizontal direction which is offset relative to the main axes of the rear face (9) of the cage intersomatic (1).   7. intersomatic cage according to claim 1, characterized in that the markers (17, 18) are formed in a cylindrical wire passing right through the interbody cage and which is produced in a radio opaque material capable of being visible during '' an X-ray image to allow to visualize the position of the intersomatic cages (1) between them and with respect to the vertebral bodies of the overlying and underlying vertebrae (VS, Vl) of a spine.   8. intersomatic cage according to claim 1, characterized in that the upper edges (4) and lower (5) respectively comprise on either side of the internal space (3) teeth (10) with inclined profile which blows being managed