FR3058316A1 - ASSEMBLY COMPRISING TWO INTERSOMATIC IMPLANTS - Google Patents

Abstract

Assembly (1) comprising a first interbody implant (2) with a first implant body (3) and a second intersomatic implant (4) with a second implant body (5). The posterior face (3c) of the first implant body (3) and the anterior face (5d) of the second implant body (5) have congruent shapes.

Description

058 316

60842 ® 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: 09.11.16. ©) Applicant (s): LAPE MEDICAL Responsible company ©) Priority: limited bility - FR. @ Inventor (s): ALLIOUX JEAN-JACQUES, GRADEL THOMAS and LE NAELOU SIMON. (43) Date of public availability of the request: 11.05.18 Bulletin 18/19. ©) List of documents cited in the report preliminary research: Refer to end of present booklet (© References to other national documents ©) Holder (s): LAPE MEDICAL Liability company related: limited. ©) Extension request (s): ® Agent (s): CABINET PONCET.

ASSEMBLY COMPRISING TWO INTERSOMATIC IMPLANTS.

(U /) Assembly (1) comprising a first interbody implant (2) with first implant body (3) and a second interbody implant (4) with second implant body (5). The posterior face (3c) of the first implant body (3) and the anterior face (5d) of the second implant body (5) have congruent shapes.

FR 3 058 316 - A1

6948FDEP.tta

The present invention relates to the field of interbody implants, and more particularly relates to interbody implants intended to be inserted by transforaminal route.

To stabilize two adjacent vertebrae between which a natural vertebral disc has been removed, use is made of interbody implants which generally include an implant body of biocompatible material having a general parallelepipedal structure limited by upper and lower faces intended to come into contact. of two adjacent vertebral plates, by a posterior face and an anterior face extending along a longitudinal axis of the first implant body, and by two opposite lateral faces connecting the posterior and anterior faces to one another.

There are various ways of inserting implants between the discs.

The anterior route through which the spine is approached through an incision in the abdomen is known. This route has the disadvantage of a risk of damage to the patient's viscera, which can in particular lead to impotence in men. It nevertheless allows the insertion of large size interbody implants.

Another route, called transforaminale, is less invasive. The spine is approached by a small incision in the back. The downside is that inserting large interbody implants is difficult, if not impossible, which can affect good stabilization of the vertebrae.

A problem proposed by the present invention is to provide better stabilization of two adjacent vertebrae by the transforaminal route.

To achieve this object as well as others, the invention proposes a set comprising:

a first intersomatic implant comprising a first implant body made of biocompatible material having a general parallelepipedal structure limited by upper and lower faces intended to come into contact with two adjacent vertebral plates, by a posterior face and an anterior face extending along a longitudinal axis of the first implant body, and by two opposite lateral faces connecting together the posterior and anterior faces,

a second interbody implant comprising a second implant body made of biocompatible material having a general parallelepiped structure limited by upper and lower faces intended to come into contact with two adjacent vertebral plates, by a posterior face and an anterior face extending along a longitudinal axis of the second implant body, and by two opposite lateral faces connecting together the posterior and anterior faces;

6948FDEP.docx according to the invention, the posterior face of the first implant body and the anterior face of the second implant body have congruent shapes.

During the operation, the incision in the patient's back remains sized for the passage of a single interbody implant (and therefore has a reduced size), in order to maintain the advantageous minimally invasive nature of the transforaminal route. The surgeon first inserts the first interbody implant between the vertebrae in a good place, then inserts the second interbody implant between the vertebrae. When inserting the second interbody implant, the surgeon brings the anterior side of the second interbody implant body into contact with the posterior side of the first implant body. Due to their congruence, these two faces are in perfect support against each other: the two interbody implants form by complementarity, after insertion and support against each other, one and the same large interbody implant allowing better stabilization of the adjacent vertebrae.

For the insertion of a single intersomatic implant of size equivalent to the assembly according to the invention, the size of the incision in the patient's back should have been larger (about twice as much), or even would not have could be practiced because too large not to damage the patient's tissues.

Advantageously, it can be provided that:

the rear face of the first implant body extends, between the upper and lower faces of the first implant body, at a height substantially equal to the height along which the front face of the second implant body extends between the upper and lower faces of the second implant body,

- the upper and lower faces of the first implant body form a first angle between them,

- the upper and lower faces of the second implant body form a second angle between them,

- The first angle is substantially equal to the second angle.

Due to the same heights of the posterior faces of the first implant body and the anterior of the second implant body, as well as the same angles formed between the upper and lower faces of the first and second implant bodies, the upper faces of the first and second implant body extend in continuity with each other, and the lower faces of the first and second implant body also extend in continuity with one another. The support of the vertebrae on the assembly is thus almost homogeneous on the upper and lower faces of the large interbody implant formed by complementarity of the two interbody implants of the group.

6948FDEP.docx

Advantageously, it can be provided that:

- the upper and lower faces of the first implant body form between them a first non-zero angle so as to converge towards the posterior face,

- the upper and lower faces of the second implant body form between them a second non-zero angle so as to converge towards the posterior face.

The non-zero angle formed between the upper and lower faces of the first and second implant bodies allows restoration of the natural lordosis.

Advantageously, it can be provided that, for each of the first and second implant bodies, the upper face and the lower face of the implant body have the same convexity.

The identical convexity of the upper and lower faces of the implant body makes it possible to have only one side face provided with reversible attachment means for a gripper allowing the interbody implant to be positioned either from the left or by the right of the spine. The resistance of the interbody implant is thus less affected by the production of the fixing means, and the cost of manufacturing the implant body is reduced.

Preferably, each of the first and second implant bodies may include an interior cavity opening onto the upper and lower faces. This interior cavity is generally intended to contain a bone graft to promote the joining of the vertebrae to each other by fusion through the interbody implant.

Advantageously, the anterior and / or posterior faces of the first and second implant bodies may have a through hole. This through hole (s) improves (s) the vascular supply of the graft and thus increases (s) the chances of a good transplant.

Preferably, the upper and lower faces of the first and second implant bodies may include a plurality of curved parallel edges projecting from the respective face and extending between the side faces.

The edges allow a good maintenance in position between the vertebrae. And their curved nature participates in the pivoting guidance of the interbody implant relative to the vertebrae for a suitable orientation.

Advantageously, it can be provided that one of the posterior face of the first implant body and of the anterior face of the second implant body has at least one convex part along the longitudinal axis while the other of the face

6948FDEP.düLx posterior of the first implant body and of the anterior face of the second implant body has at least one concave part along the longitudinal axis and intended to receive said convex part.

The posterior face of the first implant body and the anterior face of the second implant body thus have shapes providing penetration of one implant body into the other (the concave part of one receiving the convex part of the other). This penetration allows a relative timing of the first and second intersomatic implants along the longitudinal axes.

An interpenetration can also be provided with, on one of the posterior face of the first implant body and the anterior face of the second implant body, a plurality of concave and convex parts corresponding to additional concave and convex parts provided on the other of the posterior face of the first implant body and the anterior face of the second implant body.

Other objects, characteristics and advantages of the present invention will emerge from the following description of particular embodiments, given in relation to the attached figures, among which:

- Figure 1 is a perspective view of a particular embodiment of the assembly according to the invention;

- Figure 2 is a perspective view of the assembly of Figure 1, wherein the first and second interbody implants are in contact with each other to complementarily form a single large interbody implant;

- Figure 3 is a top view of the assembly of Figure 2, positioned on the upper plate of a vertebra;

- Figure 4 is a side view of the assembly of Figure 2; and

- Figure 5 is a front view of the assembly of Figure 2.

In Figures 1 to 5 is illustrated a particular embodiment of assembly 1 according to the invention.

Set 1 includes:

a first intersomatic implant 2 comprising a first implant body 3 made of biocompatible material having a general parallelepipedal structure limited by upper 3a and lower 3b faces intended to come into contact with two adjacent vertebral plates, by a posterior face 3c and a face anterior 3d extending along a longitudinal axis ll of the first implant body 3, and by two opposite lateral faces 3e and 3f connecting together the posterior faces 3c and anterior 3d,

6948FDEP.docx

a second intersomatic implant 4 comprising a second implant body 5 made of biocompatible material having a general parallelepipedal structure limited by upper 5a and lower 5b faces intended to come into contact with two adjacent vertebral plates, by a posterior face 5c and a face anterior 5d extending along a longitudinal axis ll-ll of the second implant body 5, and by two opposite lateral faces 5e and 5f connecting the posterior 5c and anterior 5d faces together.

It can be seen more particularly in FIGS. 2 and 3 that the rear face 3c of the first implant body 3 and the front face 5d of the second implant body 5 have congruent shapes. The rear face 3c and the front face 5d can thus come into intimate surface support one against the other. The two intersomatic implants 2 and 4 form by complementarity, after insertion and support one against the other, a single large interbody implant allowing better stabilization of the adjacent vertebrae.

More specifically, the rear face 3c of the first implant body 3 is concave along the longitudinal axis II while the front face 5d of the second implant body 5 is convex along the longitudinal axis II-II (with same radii of curvature due to their congruence). The posterior face 3c is thus able to receive the anterior face 5d in order to obtain a relative setting of the first 3 and second 5 interbody implants along the longitudinal axes I-I and II-II.

In Figure 4, we see that:

- the rear face 3c of the first implant body 3 extends between the upper 3a and lower 3b faces of the first implant body 3, at a height H1 substantially equal to the height H2 along which the front face extends 5d of the second implant body 5 between the upper 5a and lower 5b faces of the second implant body 5,

- the upper 3a and lower 3b faces of the first implant body 3 form between them a first angle A1,

- the upper 5a and lower 5b faces of the second implant body 5 form between them a second angle A2,

- The first angle A1 is substantially equal to the second angle A2.

Due to the same heights H1 and H2 as well as the same angles A1 and A2, the upper faces 3a and 5a extend substantially in continuity from one another, and the lower faces 3b and 5b also extend substantially in continuity of each other. The support of the vertebrae on the assembly 1 is thus almost homogeneous on the upper faces 3a and 5a and lower 3b and 5b of the implant.

694SFDEP.ÜOCX large size interbody formed by complementarity of the two interbody implants 2 and 4 of set 1.

The angles A1 and A2 are preferably harmless, so that the upper 3a and lower 3b faces and that the upper 5a and lower 5b faces converge in the direction of the respective rear faces 3c and 5c. The angles A1 and A2 are advantageously close to approximately 4 °.

In FIG. 5, it can be seen that the upper face 3a and the lower face 3b of the implant body 3 have the same convexity along the longitudinal axis l-l. Similarly, the upper face 5a and the lower face 5b of the implant body 5 have the same convexity along the longitudinal axis ll-ll. These identical convexities between upper faces 3a or 5a and lower faces 3b or 5b of the implant bodies 3 or 5 allow the placement of interbody implants 2 and 4 either from the left or from the right of the spine. It is thus only necessary to provide only one of the lateral faces of fastening means 6 for attaching and fixing a gripper in a removable manner. Here, it is the lateral faces 3e and 5e which are provided with fixing means 6. The fixing means 6 comprise a threaded hole.

We see in Figures 1 and 2 that the first implant body 3 includes an inner cavity 3g opening on the upper 3a and lower 3b faces. Similarly, the implant body 5 includes an interior cavity 5g opening onto the upper 5a and lower 5b faces. The interior cavities 3g and 5g are intended to receive a bone graft.

To better vascularize said bone graft, the anterior faces 3d and 5d as well as the posterior faces 3c and 5c have through holes 7.

The upper 3a and lower 3b faces of the first implant body 3 comprise a plurality of curved parallel edges 8 projecting from the respective face 3a or 3b and extending between the lateral faces 3e and 3f (FIG. 1). The same is true for the second implant body 5.

The present invention is not limited to the embodiments which have been explicitly described, but it includes the various variants and generalizations thereof contained in the field of claims below.

6948FDEP.ttocx

Claims (8)

1 - Set (1) comprising: a first intersomatic implant (2) comprising a first implant body (3) made of biocompatible material having a general parallelepiped structure limited by upper (3a) and lower (3b) faces intended to come into contact with two adjacent vertebral plates, by a posterior face (3c) and an anterior face (3d) extending along a longitudinal axis (ll) of the first implant body (3), and by two opposite lateral faces (3e, 3f) connecting between the posterior (3c) and anterior (3d) faces, a second intersomatic implant (4) comprising a second implant body (5) made of biocompatible material having a general parallelepipedal structure limited by upper (5a) and lower (5b) faces intended to come into contact with two adjacent vertebral plates, by a posterior face (5c) and an anterior face (5d) extending along a longitudinal axis (ll-ll) of the second implant body (5), and by two opposite lateral faces (5e, 5f) connecting the posterior (5c) and anterior (5d) faces together, characterized in that the posterior face (3c) of the first implant body (3) and the anterior face (5d) of the second implant body (5) have congruent forms. 2 - assembly (1) according to claim 1, characterized in that: - the rear face (3c) of the first implant body (3) extends, between the upper (3a) and lower (3b) faces of the first implant body (3), at a substantially equal height (H1) at the height (H2) along which extends the anterior face (5d) of the second implant body (5) between the upper (5a) and lower (5b) faces of the second implant body (5), - the upper (3a) and lower (3b) faces of the first implant body (3) form between them a first angle (A1), - the upper (5a) and lower (5b) faces of the second implant body (5) form between them a second angle (A2), - The first angle (A1) is substantially equal to the second angle (A2). 3 - assembly (1) according to claim 2, characterized in that - the upper (3a) and lower (3b) faces of the first implant body (3) form between them a first non-zero angle (A1) so as to converge towards the posterior face (3c), - the upper (5a) and lower (5b) faces of the second implant body (5) form between them a second non-zero angle (A2) so as to converge towards the posterior face (5c). 6948FDEP.docx 4 - assembly (1) according to any one of claims 1 to 3, characterized in that, for each of the first (3) and second (5) implant body, the upper face (3a, 5a) and the face lower (3b, 5b) of the implant body (3, 5) have the same convexity. 5 5 - assembly (1) according to any one of claims 1 to 4, characterized in that each of the first (3) and second (5) implant body comprises an inner cavity (3g, 5g) opening on the faces upper (3a, 5a) and lower (3b, 5b). 6 - assembly (1) according to claim 5, characterized in that the 10 anterior (3d, 5d) and / or posterior (3c, 5c) faces of the first (3) and second (5) implant bodies have a through hole (7). 7 - assembly (1) according to any one of claims 1 to 6, characterized in that the upper (3a, 5a) and lower (3b, 5b) faces of the first (3) and second (5) implant bodies include a plurality of edges 15 curved parallels (8) projecting from the respective upper or lower face (3a, 3b, 5a, 5b) and extending between the lateral faces (3e, 3f, 5e, 5f). 8 - assembly (1) according to any one of claims 1 to 7, characterized in that one of the rear face (3c) of the first implant body (3) and the front face (5d) of the second implant body (5) has at least one 20 convex part along the longitudinal axis (II, II-II) while the other of the posterior face (3c) of the first implant body (3) and the anterior face (5d) of the second implant body (5) has at least one concave part along the longitudinal axis (II, Π-II) and intended to receive said convex part. 1/5