FR3061652A1 - INTERSOMATIC IMPLANT WITH IMPROVED STABILITY - Google Patents

Abstract

The interbody implant (10) is adapted to be inserted into an intervertebral space delimited between an upper vertebral element (L5) and an adjacent lower vertebral element (S1) of an extending spine extending along an rostro-caudal axis (RC) and perpendicular to a dorso-ventral axis (DV). The implant (10) comprises a body (12) having an upper face and a lower face, and a rear face (26) and a front face (28) substantially perpendicular to a longitudinal axis (X) intended to be substantially parallel to the dorso-ventral axis (DV). The implant (10) has upper (34) and lower (36) attachment members, extending the front face (28) of the body (12) in a vertical direction (Z) perpendicular to the longitudinal axis (X) and intended to be parallel to the rostro-caudal axis (RC). The upper fixation member (34) having upper means (38) for attachment to the upper vertebral element (L5), and the lower fixation member (36) having lower means (40) for attachment to the upper lower vertebral element (S1).

Description

061 652

50158 ® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY © Publication number:

(to be used only for reproduction orders)

©) National registration number

COURBEVOIE © Int Cl ⁸ : A 61 F2 / 44 (2017.01)

PATENT INVENTION APPLICATION

A1

(© Date of filing: 06.01.17. © Applicant (s): KISCO INTERNATIONAL - FR. ©) Priority: @ Inventor (s): CHAROSKY CLEMENT, BERNARD MARC, METZ ANNE, DEWALD CHRISTOPHER J., (43) Date of public availability of the GEHRCHEN POUL MARTIN, ROUSSOULY PIERRE and request: 13.07.18 Bulletin 18/28. SILVESTRE CLEMENT. ©) List of documents cited in the report preliminary research: Refer to end of present booklet (© References to other national documents ® Holder (s): KISCO INTERNATIONAL. related: ©) Extension request (s): ©) Agent (s): LAVOIX.

INTERSOMATIC IMPLANT WITH IMPROVED STABILITY.

FR 3 061 652 - A1 (5 / d The interbody implant (10) is intended to be inserted in an intervertebral space delimited between an upper vertebral element (L5) and a lower vertebral element (S1) adjacent to a spinal column s extending extending along a rostro-caudal axis (RC) and perpendicular to a dorso-ventral axis (DV). The implant (10) comprises a body (12) having an upper face and a lower face, as well as a rear face (26) and a front face (28) substantially perpendicular to a longitudinal axis (X) intended to be substantially parallel to the dorso-ventral axis (DV). The implant (10) comprises elements upper (34) and lower (36) fixing, extending the front face (28) of the body (12) in a vertical direction (Z) perpendicular to the longitudinal axis (X) and intended to be parallel to the rostro axis -caudal (RC) .The upper fixing element (34) comprising upper means (38) of f fixing to the upper vertebral element (L5), and the lower fixing element (36) comprising lower means (40) for fixing to the lower vertebral element (S1).

28 40 36

Interbody implant with improved stability

The present invention relates to an interbody implant intended to be inserted into an intervertebral space delimited between an upper vertebral element and a lower vertebral element adjacent to a vertebral column.

For example, the implant is an intersomatic cage, in particular of the ALIF type (English acronym for "Anterior Lumbar Interbody Fusion").

Such an intersomatic cage usually includes an interior space, intended to receive a graft, in particular autogenic bone, synthetic phospho-calcites, osteo-inducers or the like, intended to promote bone fusion between the superior vertebral element and the lower vertebral element.

In order for bone fusion to be carried out optimally, the cage should preferably remain positioned with great stability in the intervertebral space.

The object of the invention is in particular to optimize this stability of the cage, in a simple, reliable and efficient manner.

To this end, the subject of the invention is in particular an interbody implant intended to be inserted in an intervertebral space delimited between an upper vertebral element and a lower vertebral element adjacent to a spinal column extending extending along a rostro-caudal axis and perpendicular to a dorso-ventral axis, the implant comprising a body having an upper face and a lower face, as well as a rear face and a front face substantially perpendicular to a longitudinal axis intended to be substantially parallel to the dorso-ventral axis, characterized in that the interbody implant has upper and lower fixing elements, extending the front face of the body in a vertical direction perpendicular to the longitudinal axis and intended to be parallel to the rostro axis -caudal, the upper fixing element comprising upper means for fixing to the element upper vertebral element, and the lower fixing element comprising lower means for fixing to the lower vertebral element.

The fixing elements, extending the front face of the body of the implant, allow effective fixing on the upper and lower vertebral elements.

An intersomatic implant according to the invention may also include one or more of the following characteristics, taken alone or in any technically conceivable combination.

- The body and the upper and lower fixing elements have come in one piece.

- The body and / or the upper and lower fixing elements are produced by three-dimensional printing.

- Each fastening element has a general shape of tongue.

- The upper and lower fixing means each comprise an orifice for the passage of a fixing member, in particular a screw, formed in the corresponding upper or lower fixing element.

- The upper and lower faces are inclined relative to each other, at an angle between 8 and 30 °, preferably greater than 20 °.

- The interbody implant is dimensioned to be inserted in an intervertebral space delimited between a lower vertebral element formed by a sacrum and an upper vertebral element formed by a first vertebra adjacent to the sacrum, or in an intervertebral space delimited by a lower vertebral element formed by a first vertebra adjacent to the sacrum and an upper vertebral element formed by a second vertebra adjacent to the first vertebra.

- The interbody implant includes at least one upper opening in the upper face, at least one lower opening in the lower face, and an interior space extending between the lower and upper openings.

- At least one of the upper or lower faces is rough, for example comprises a plurality of teeth or grooves, or is crosslinked.

The invention will be better understood on reading the description which follows, given solely by way of example and made with reference to the appended figures, among which:

- Figure 1 is a perspective view of an interbody implant according to an exemplary embodiment of the invention;

- Figure 2 is a front view of the implant of Figure 1, located between two vertebral elements.

FIG. 1 shows an intersomatic implant 10 according to an exemplary embodiment of the invention.

For example, implant 10 is an ALIF type cage (acronym for "Anterior Lumbar Interbody Fusion").

However, as a variant, the implant 10 could be of another type.

The implant 10 is conventionally intended to be inserted into an intervertebral space delimited between two adjacent vertebral elements of a vertebral column, called upper and lower vertebral elements.

In the example described, as shown in FIG. 2, the lower vertebral element is a sacrum S1 and the upper vertebral element is a first vertebra L5 adjacent to the sacrum S1.

Alternatively, the lower vertebral element is a first L5 vertebra adjacent to the sacrum S1, and the upper vertebral element is a second L4 vertebra adjacent to the first L5 vertebra.

In both cases, the implant 10 is sized to be inserted into the corresponding intervertebral space.

The implant 10 comprises a body 12 having an upper face 14 intended to be arranged facing the upper vertebral element when the implant 10 is implanted in the intervertebral space, and a lower face 16 intended to be arranged in look of the lower vertebral element when the implant 10 is implanted.

The upper 14 and lower 16 faces are inclined relative to each other. More particularly, the upper 14 and lower 16 faces advantageously form an angle between 8 and 30 °, preferably greater than 20 °.

According to the embodiment described, the body 12 comprises at least one upper opening 18 formed in the upper face 14, at least one lower opening 20 formed in the lower face 16. The body 12 also includes an interior space 22 extending between the upper 18 and lower 20 openings.

More particularly, the body 12 comprises two interior spaces 22 separated by a central intermediate wall 24, and for each interior space 22, an upper opening 18 and a lower opening 20 respectively.

Each interior space 22 is intended to receive a graft, in particular autogenic bone, synthetic phospho-calcites, osteo-inducers or the like, intended to promote bone fusion between the plates of the adjacent vertebrae. Such a hollow implant is also called an “intersomatic cage”.

Thus, the upper face 14 has an upper contact surface with the upper vertebral element, framing the upper openings 18. More particularly, the upper contact surface extends circumferentially around the upper openings 18, and above the wall central 24.

Similarly, the lower face 16 has a lower contact surface with the lower vertebral element, framing the lower openings 20. More particularly, the lower contact surface extends circumferentially around the lower openings 20, and below the central wall 24.

Each of the upper 14 and lower 16 faces is rough to allow good support with the corresponding upper or lower vertebral element. For example, the upper 14 and lower 16 faces are toothed, striated or crosslinked.

The body 12 also comprises a rear face 26 and a front face 28, extending in height between the upper 14 and lower faces 16. The rear 26 and front 28 faces are generally substantially perpendicular to a longitudinal axis X.

When the implant 10 is implanted in the intervertebral space, the longitudinal axis X is substantially parallel to a dorso-ventral axis of the patient, the dorso-ventral axis being conventionally defined by the direction of the back, belly succession.

Due to the inclination of the upper 14 and lower 16 faces, the rear face 26 has a rear height, considered parallel to a vertical axis Z perpendicular to the longitudinal axis X, which is less than a front height of the front face 28 , considered parallel to this same vertical axis Z. This vertical axis Z is intended to be substantially parallel to a rostro-caudal axis RC of the spine when the implant 10 is implanted.

Advantageously, the front face 28 comprises at least one notch 29, intended to cooperate with a suitable handling tool, for handling the implant 10 during its implantation.

The body 12 also comprises lateral faces 30, each connecting the rear 26 and front 28 faces.

Each side face 30 advantageously comprises an opening 32, for example through and opening into the corresponding interior space 22.

The general shape and dimensions of the body 12 are conventional, and chosen according to the intervertebral space in which the implant 10 is intended to be implanted.

The implant 10 according to the invention also comprises upper 34 and lower 36 fixing elements, extending the front face 28 of the body 12 in the vertical direction Z.

The upper fixing element 34 comprising upper means 38 for fixing to the upper vertebral element L5, and the lower fixing element comprising lower means 40 for fixing to the lower vertebral element S1. Thus, the upper 34 and lower 36 fastening elements extend sufficiently in the vertical direction Z so that the upper 38 and lower 40 fastening means are located opposite the corresponding upper L5 or lower S1 vertebral element when the implant 10 is installed.

For example, each upper 34 or lower 36 fixing member has a general tongue shape.

Preferably, each fixing element 34, 36 has a length of between 10 and 15 mm, for example substantially equal to 12.5 mm, taken in the direction of the vertical axis Z, from the junction between this fixing element 34 , 36 and the corresponding upper face 14 or lower face 16.

Advantageously, the upper fixing means 38 comprise an upper orifice for the passage of an upper fixing member, in particular of a screw. This upper passage orifice is located opposite the upper vertebral element L5 when the implant 10 is implanted, as can be seen in FIG. 2.

Likewise, the lower fixing means 38 comprise a lower orifice for the passage of a lower fixing member, in particular of a screw. This lower passage orifice is located opposite the lower vertebral element S1 when the implant 10 is implanted, as can be seen in FIG. 2.

Advantageously, the body 12 and the fastening elements 34, 36 have come in one piece. Implant 10, thus in one piece, has no discontinuity in material.

Preferably, the body 12 and / or the fastening elements 34, 36 are produced by three-dimensional printing.

The body 12 and the fastening elements 34, 36 are made of a biocompatible material, for example titanium. Alternatively, the body 12 and the fastening elements 34, 36 are made of any suitable material, for example stainless steel, polymer, etc.

It will be noted that the fastening elements 34, 36 according to the invention allow reliable and stable fixing of the implant 10 in the intersomatic space. This reliable and stable attachment allows in particular the use of a body 12 whose angle between the upper 14 and lower 16 faces is particularly large (in particular greater than 20 ° for example). The fastening elements 34, 36 according to the invention make it possible to avoid expulsion of the implant 10, even in the case of a large angle.

Note that the invention is not limited to the embodiment described above, and could have various variants.

Claims (9)

1. intersomatic implant (10) intended to be inserted into an intervertebral space delimited between an upper vertebral element (L5) and a lower vertebral element (S1) adjacent to a spinal column extending extending along an axis rostro-caudal (RC) and perpendicular to a dorso-ventral axis (DV), the implant (10) comprising a body (12) having an upper face (14) and a lower face (16), as well as a face rear (26) and a front face (28) substantially perpendicular to a longitudinal axis (X) intended to be substantially parallel to the dorso-ventral axis (DV), characterized in that the interbody implant (10) comprises elements upper (34) and lower (36) fixing, extending the front face (28) of the body (12) in a vertical direction (Z) perpendicular to the longitudinal axis (X) and intended to be parallel to the rostro axis -caudal (RC), the upper fixing element (3 4) comprising upper means (38) for fixing to the upper vertebral element (L5), and the lower fixing element (36) comprising lower means (40) for fixing to the lower vertebral element (S1). 2. An interbody implant (10) according to claim 1, in which the body (12) and the upper (34) and lower (36) fixing elements have come in one piece. 3. intersomatic implant (10) according to claim 2, wherein the body (12) and / or the upper (34) and lower (36) fixing elements are produced by three-dimensional printing. 4. An intersomatic implant (10) according to any one of the preceding claims, in which each fixing element (34, 36) has a general shape of tongue. 5. interbody implant (10) according to any one of the preceding claims, in which the upper (38) and lower (40) fixing means each comprise a passage opening for a fixing member, in particular a screw, formed in the corresponding upper (34) or lower (36) fixing element. 6. intersomatic implant (10) according to any one of the preceding claims, in which the upper (14) and lower (16) faces are inclined with respect to each other, by an angle between 8 and 30 °, preferably greater than 20 °. 7. intersomatic implant (10) according to any one of the preceding claims, dimensioned to be inserted in an intervertebral space delimited between a lower vertebral element formed by a sacrum (S1) and an upper vertebral element 5 formed by a first vertebra (L5) adjacent to the sacrum (S1), or in an intervertebral space delimited between a lower vertebral element formed by a first vertebra (L5) adjacent to the sacrum (S1) and an upper vertebral element formed by a second vertebra (L4) adjacent to the first vertebra (L5). 10 8. intersomatic implant (10) according to any one of the preceding claims, comprising at least one upper opening (18) formed in the upper face (14), at least one lower opening (20) formed in the lower face (16) , and an interior space (22) extending between the lower (18) and upper (20) openings. 9. intersomatic implant (10) according to any one of the preceding claims, in which at least one of the upper (14) or lower (16) faces is rough, for example comprises a plurality of teeth or grooves, or is crosslinked. ³⁸ 34 30 FRENCH REPUBLIC will I institute r NATIONAL INSTITUTE INDUSTRIAL PROPERTY