Spinal connector implant for receiving a spinal rod and a pedicle screw assembly

Abstract

A spinal connector implant (1) is proposed for connecting and / or aligning at least a first rod with a second rod. The connector implant (1) comprises an implant body (20) with a pocket sized and shaped to engage over a rod receiving head (81) of a pedicle screw assembly (80); at least a first rod receiving passage (50) intersecting a first rod locking arrangement (51); and a rod receiving head locking mechanism (60) providing a locked state and an unlocked state. The rod receiving head locking mechanism (60) is configured to rigidly lock the rod receiving head (81) against at least a portion of the pocket in the locked state. The rod receiving head is movably engaged in the pocket in the unlocked state for assembly purposes, and in the locked state, the rod receiving head is rigidly fixed in the pocket of the connector implant.

Description

[0001] SPINAL CONNECTOR IMPLANT FOR RECEIVING A SPINAL ROD AND A PEDICLE

[0002] SCREW ASSEMBLY

[0003] TECHNICAL FIELD OF THE INVENTION

[0004] The present invention relates to a spinal connector implant or assembly, which is a modular addition to a standard spinal posterior pedicle screw and rod system. The connector implant can enhance an existing system for better correcting deformities or degenerations of the spine, namely with the option to place an additional posterior rod. Some spinal surgical procedures require high correction forces, thereby often requiring very rigid spinal bone fastener assemblies, and a possibility of attaching manipulation force levering instruments. To maintain the correction during a bone fusion period and during a correction surgery procedure, such a system preferably provides the possibility of receiving two mutually parallel spinal rods in the pedicle screw assembly at least on one side of the spine. For this purpose, a pedicle screw assembly needs two rod receiving passages in the rod receiving head of the assembly. An additional rod receiving passage can be provided by attaching the spinal connector implant of the present invention to a (standard) pedicle screw assembly with only one single rod receiving passage. The present invention also relates to a kit comprising the spinal connector implant, and to a method of connecting the spinal connector implant to a standard pedicle screw assembly with only one rod receiving passage.

[0005] BACKGROUND OF THE INVENTION

[0006] In orthopaedic surgery around the spine, posterior spinal stabilisation systems are often placed to a target site to realign, correct and / or stabilise the spinal column to compensate for malalignment caused by for example degeneration of the spine, inborn malalignments, such as excessive lordosis, kyphosis and scoliosis, and caused by for example trauma, such as fractures. Often the placement of a construct to correct the spinal column requires the application of high forces. In such cases, often a standard pedicle screw combined with one single rod cannot provide the needed stability. There is a risk that the initial position of the system may be lost due to slippage between the pedicle screw head and the rod receiving head. Even worse, the single rod may not withstand the loads it is carrying over time, and a material fatigue-related rod fracture may occur.

[0007] A state-of-the-art pedicle screw assembly comprises a system of engaging elements that allows a surgeon to lock the rod, the rod receiving head and the pedicle screw simultaneously, by tightening a set screw or a rod fastener. Prior to this locking step, the rod receiving head is movably connected to the pedicle screw head so that is it configured to swivel and rotate. Due to this movable connection between the rod receiving head and the pedicle screw head, only limited correction forces can be applied directly to the pedicle screw. It is possible to apply forces that are directed substantially parallel to the screw axis. However, it is practically impossible to apply correction forces to the screw, such as rotational or tilting moments. Normally, the correction is made using instruments that grasp the rod receiving head, and the rod and pull both towards each other. After this step, the construct is fixated by tightening the rod fastener in place. Only then, the whole construct becomes fully stable. In many types of surgeries, for normal corrections, the previously described correction technique provides a surgeon with sufficient control to correct the spinal column.

[0008] However, in the cases of major corrections or largely displaced fractures, often the previously described technique does not provide a sufficient correction control. An intermediate locking step, namely rigidly locking the bone fastener head into the rod receiving head is needed.

[0009] Furthermore, the ability of placing at least two rods into the rod receiving head is needed. This ability provides the required stability, and it prevents the rods from breaking. Additionally, the ability of attaching correction instruments without blocking the rode receiving passage of a pedicle screw assembly, which would allow the surgeon to apply large correction forces, is needed.

[0010] A pedicle screw assembly normally comprises only one rod receiving passage, and the pedicle screw assembly is made available with a bone screw in multiple diameters and lengths. Moreover, pedicle screw assemblies often are provided with or without a central cannulation through the bone fastener. Moreover, different pedicle screw assemblies are made available wherein the rod receiving heads are configured differently to receive rods with different diameters.

[0011] As a result, a large portfolio or a high number of stock-keeping units are made available by the providers of pedicle screw assemblies. If all these pedicle screw assemblies would also be offered with a rod receiving head with at least two rod receiving passages, an even larger portfolio of implants would be required.

[0012] SUMMARY OF THE INVENTION

[0013] It is an object of the present invention to overcome at least some of the problems associated with correcting large spinal deformities or displaced fractures using a state-of-the-art pedicle screw and state-of-the-art rod constructs. A solution is needed that allows the spinal column to be corrected and re-stabilised in a safe and controlled manner, when greater correction forces need to be applied. Furthermore, the risks of implant failure due to material fatigue or connection slippage need to be overcome. Moreover, there is a need to provide a solution for the above needs, without increasing the number of available implants with a large number of new implants.

[0014] Therefore, there is a need for a modular connector implant that provides the ability and flexibility to connect with a standard pedicle screw assembly with one rod receiving passage (more specifically for example in the rod receiving head), to thereby provide a second rod receiving passage. The connection step is performed prior to the introduction and fixation of a posterior rod. Furthermore, a connector implant is needed that provides room for placement of at least two posterior rods. Moreover, a connector implant is needed that can be connected to a correction instrument, thereby allowing a spinal vertebral body to be manipulated by manipulating the connector implant and an attached or connected pedicle screw assembly. Moreover, a solution is needed that allows more correction instruments to be connected to maintain a correction in a handsfree manner, whilst placing a posterior rod for temporarily or final fixation.

[0015] According to a first aspect of the invention, there is provided a connector implant as recited in claim 1 .

[0016] The proposed connector implant is intended for connecting and / or aligning at least a first rod with a second rod, the connector implant comprising: an implant body with a pocket being sized and shaped to engage over a rod receiving head of a pedicle screw assembly, the rod receiving head being configured to receive or hold a first rod, at least a first rod receiving passage intersecting a first rod locking arrangement, and configured to receive or hold a second rod, and a pedicle rod receiving head locking mechanism providing a locked state and unlocked state, the rod receiving head locking mechanism being configured to rigidly lock the rod receiving head of the pedicle screw assembly in the pocket.

[0017] The proposed connector implant thus provides the possibility to place the second rod next to the first rod engaged or to be engaged in the rod receiving head of the pedicle screw assembly.

[0018] According to a second aspect of the invention, there is provided a spinal connector implant assembly comprising the spinal connector implant according to the first aspect, wherein the assembly further comprises a pedicle screw assembly, and wherein the pocket of the spinal connector implant is sized and shaped to receive the rod receiving head in a substantially play free manner.

[0019] According to a third aspect of the invention, there is provided a kit comprising the connector implant and at least one assembly aid instrument or tightening instrument. Furthermore, there is provided a kit with at least two spinal connector implants which are mutually mirrored designs for a right-side spinal column and left-side spinal column application.

[0020] According to a fourth aspect of the invention, there is provided a method of stabilising a spinal column by assembling the spinal connector implant to the rod receiving head of a (standard) pedicle screw.

[0021] Other aspects of the invention are recited in the dependent claims attached hereto.

[0022] BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features and advantages of the invention will become apparent from the following description of non-limiting example embodiments, with reference to the appended drawings, in which:

[0024] - Figures 1A and 1B depict an example spinal connector implant according to a first embodiment of the present invention in a front and back perspective view, respectively;

[0025] - Figure 1C shows the connector implant of Figures 1A and 1 B in a partially cross- sectional view;

[0026] - Figures 1 D and 1 E show the same connector implant of Figures 1 A and 1 B in an exploded and assembled view, respectively;

[0027] - Figures 1 F and 1 G show details of a locking arrangement for locking a pedicle screw assembly in an implant body of the implant connector;

[0028] - Figures 2A and 2B show the connector implant together with a standard pedicle screw assembly;

[0029] - Figures 3A and 3B show variants of the spinal connector implant or implant assembly;

[0030] - Figures 4A to 4E show an anatomically and ergonomically sized and shaped connector implant;

[0031] - Figures 5A and 5B show a typical standard pedicle screw assembly; - Figures 6A to 61 show an example assembly method for assembling the connector implant of Figures 4A to 4E over the pedicle screw assembly of Figures 5A and 5B;

[0032] - Figures 7A to 7M show an example surgical flow using the connector implant;

[0033] - Figures 8A and 8B show another variant of a spinal connector implant and an accompanying pedicle screw assembly design;

[0034] - Figures 9A and 9B show yet another variant of a spinal connector implant.

[0035] - Figures 10A and 10B show yet another variant of a spinal connector implant with connector extensions;

[0036] - Figures 11A and 11B show yet another variant of a spinal connector implant that comprises an alternatively arranged rod receiving head locking mechanism;

[0037] - Figures 12A to 12C show yet another variant of a spinal connector implant that comprises a variant compliant structure;

[0038] - Figures 13A and 13B show yet another variant of a spinal connector implant that comprises a plurality of rod receiving head locking mechanisms;

[0039] - Figures 14A to 14C show yet another variant of a spinal connector implant that comprises a variant compliant structure;

[0040] - Figures 15A and 15B show yet another variant of a spinal connector implant that comprises a variant compliant structure;

[0041] - Figures 16A to 16C show yet another variant of a spinal connector implant that comprises a variant clamping mechanism;

[0042] - Figures 17A to 17D show the mechanism of clamping as described in connection with Figures 16A to 16C;

[0043] - Figures 18A to 18D show an example surgical flow or method;

[0044] - Figures 19A and 19B show yet another variant of a spinal connector implant that comprises another type of a clamping mechanism;

[0045] - Figures 20A to 20D show yet another variant of a spinal connector implant that comprises another type of a clamping mechanism;

[0046] - Figures 21 A to 21 C show yet another variant of a spinal connector implant that comprises another type of a clamping mechanism; and

[0047] - Figures 22A to 22D show yet another variant of a spinal connector implant that comprises another type of a clamping mechanism.

[0048] DETAILED DESCRIPTION OF THE INVENTION

[0049] The embodiments of the present invention will now be described in detail with reference to the attached figures. The embodiments are described in the context of placing a posterior spinal construct in its implantation location and correcting a larger deformity. Although the invention is specifically described in the context of correcting a larger deformity, the teachings of the invention are not limited to this environment. The teachings of the present invention are equally applicable to extending rod-based stabilisation constructs for other bones. When the words first and second are used to refer to different elements, it is to be understood that this does not necessarily imply or mean that the first and second elements are somehow structurally substantially different elements or that their dimensions are substantially different unless specifically or implicitly stated. A connector implant in this context means a structural element or implant assembly, which can be connected to a pedicle screw assembly which has been or will be brought into the target bone and forms a stable connection between the target bone and the remaining spinal construct. Most often, a pedicle screw assembly is a fastening element comprising a bone screw, a rod receiving head with a locking insert or mechanism, which is configured to create a rigid connection between the bone fastener and the rod receiving head. Furthermore, a pedicle screw assembly comprises a set screw which is intended to engage into the rod receiving head and to clamp a spinal rod arranged therein against the insert and against the head of the pedicle screw. Identical or corresponding functional and structural elements which appear in the different drawings are assigned the same reference numerals.

[0050] Referring to Figures 1A and 1 B, a spinal connector implant 1 according to an example embodiment of the present invention is shown in a front and back perspective view, respectively. Figure 1C shows the connector implant 1 in a partially cross-sectional view, while Figures 1 D and 1 E show the same connector implant 1 in an exploded and assembled view, respectively. These views depict two further components, namely a locking means or locking bolt 61 to lock the connector implant to the rod receiving head of a pedicle screw assembly 80, and a rod locking means or set screw or grub screw 90, configured to lock a second posterior rod 6, as explained in greater detail later. According to the present embodiment, as depicted in Figures 1A to 1G, the connector implant 1 comprises an implant body 20, having a body length BL, a body width BW and a body height BH. The body length BL and the body height BH define a first body side 21 , and respectively a second, opposite body side 22. The body width BW and body height BH define a third body side 23, and a fourth, opposite body side 24, or first and second body end portions 23, 24. Moreover the body length BL and the body width BW define a body top side 25 and a body bottom side 26. Arranged at the third body side 23, the implant body 20 comprises a pocket 40 which is sized and shaped to engage over the rod receiving head 81 of the pedicle screw assembly 80. The pocket 40 extends from the body top side 25 to the body bottom side 26, throughout the implant body 20 and is delimited by pocket walls 46. The pocket is a so-called vertically-directed pocket. At the body top side 25, the pocket 40 comprises or defines a pocket top side section 41 forming a top side opening 44. At the body bottom side 26, the pocket 40 comprises or defines a pocket bottom side section 43 forming a bottom side opening 45. Between the bottom side section 43 and the top side section 41 , the pocket 40 comprises or defines a pocket middle section 42.

[0051] At the fourth side 24, the implant body 20 comprises at least a first rod receiving passage 50. The first rod receiving passage is sized and shaped to receive an additional or second posterior rod 6. To rigidly lock the rod into the rod receiving passage 50, a first rod locking mechanism, feature or arrangement 51 is provided, which intersects the first rod receiving passage 50. In this example the first rod locking mechanism 51 is configured as a threaded bore or hole 52 to threadedly engage with a first set screw or rod locking means 90, as shown for instance in Figure 1 D. The set screw 90 comprises a thread, which in this example is an external thread 91 , sized and shape to engage with the threaded bore 52. For tightening purposes, the set screw 90 comprises a drive feature 92, such as a hexagonal or hexa-lobe drive feature. As shown, the first rod receiving passage 50 extends from the first body side 21 to the second body side 22 and is open at the body top side 25.

[0052] In this example, the implant body 20 further comprises a slot or gap 27 having a width SW. The slot 27 extends from the third side 23 at least to the pocket 40. The slot extends over the full body height BH of the implant body 20, or in other words, from the body top side 25 to the body bottom side 26. In this example, the slot thus divides the portion of the implant body between the pocket and the third side into two halves, which may or may not be symmetrical. By means of the slot, the pocket inner walls 29 become a compliant or elastic structure with the ability to bend, deflect or deform thereby having the ability to clamp the rod receiving head 81 of the pedicle screw assembly 80. In order to clamp or lock the rod receiving head 81 of the pedicle screw assembly, in this example, the connector implant comprises a first head locking mechanism 60, also referred to as a rod receiving head locking mechanism 60, that bridges or crosses the slot 27. More specifically this example rod receiving head locking mechanism 60 comprises a threaded bolt 65, with a bolt head 62 and an at least partially threaded shaft 61 . The threaded shaft 61 is configured to engage in a threaded hole 70 of the rod receiving head locking mechanism 60 extending from the slot 27 towards the second body side 22. The bolt head 62 is configured to engage against a bolt head seat 72 at the other or body first side 21 of the slot 27. The shaft 61 is engaged in a through bore or hole 71 , which is this example is a non-threaded hole, and arranged at the body first side 21. The rod receiving head locking mechanism 60 provides a locked state when the locking bolt 65 is tightened and an unlocked state when loosened. By tightening the threaded bolt, the pocket inner walls 46 are forced to approach each other thereby reducing the internal diameter or width or periphery of the pocket, and as a result, the rod receiving head of the pedicle screw will be clamped / rigidly locked as described in greater detail later. In the locked state, the rod receiving head 81 is fixed or engaged in the pocket 40 and forms a unit or rigid or stable assembly with the connector implant 1 .

[0053] The implant body 20 thus comprises a slot 27 with a slot width SW dividing the implant body 20 into a first implant body portion 30 and a second implant body portion 31 thereby forming a compliant clamping structure. The rod receiving head locking mechanism 60 comprises the threaded bolt 65 with the bolt head 62, and a first, threaded hole 70 having a first central axis, and a second hole 71 (in this example unthreaded) having a second central axis in the implant body 20. The first and second central axes or their extensions coincide in the implant body portion 20, wherein upon tightening of the threaded bolt, it engages with the threaded hole while the bolt head rests against the bolt seat 72 of the second hole to thereby reduce the slot width SW.

[0054] To ensure a large clamping force, the slot shall remain minimally open in the locked state. If the slot would be completely closed before the actual clamping occurs, the rod receiving head would remain looser in the pocket. A typical slot width in the unlocked state is 0.5 mm to 2 mm.

[0055] The spinal connector implant 1 may further comprise a second rod receiving passage 53, in this case at the third side or in the centre region of the implant body, that extends from the first body side 21 to the second body side 22 and is open to the body top side 25. As shown in Figures 1 A to 1G, the second rod receiving passage 53 intersects the pocket 40, and is configured to overlap or coincide with a third rod receiving passage 82 of the pedicle screw assembly 80. In one embodiment, the width or internal diameter of the second rod receiving passage is equal to, or minimally greater than the width or diameter of the third rod receiving passage 82. When a rod is placed in both rod receiving passages, the rod receiving head 81 and the connector implant 1 are linked in a form-fit manner, to prevent relative rotational movement between these two components.

[0056] Figures 2A and 2B show the connector implant 1 including the locking bolt 65 (forming a connector implant assembly 2) together with a standard pedicle screw assembly. In Figure 2A, the locking bolt is untightened and the connector implant assembly 2 is in an unlocked state, in which the rod receiving head 81 is loosely held in the pocket. Figure 2B shows the connector implant assembly 2 placed in its intended position and the locking bolt 65 in a tightened configuration. The connector implant assembly 2 is thus in a locked state, in which the implant body 20 is engaged over the rod receiving head 81 of the pedicle screw assembly 80.

[0057] Figures 3A and 3B show variants of the spinal connector implant 1 or implant assembly 2. Referring to Figure 3A, in one variant of the connector implant, the first rod receiving passage 50 may be open to the fourth body side 24. In another variant (not shown), the rode receiving passage 50 may be arranged obliquely (i.e., non- orthogonally), with respect to the top and bottom sides, and is open to both top and fourth body side 25, 24.

[0058] In the example connector implant as shown in Figure 3B, the connector body 20 comprises at least one first implant body portion 30 and one second implant portion 31 , wherein the implant body portions are connected by a rotating hinge 32. Clamping flexibility is provided by a hinge instead of, or in addition to a compliant structure.

[0059] Referring to Figures 4A to 4E, a more anatomically and ergonomically sized and shaped connector implant is shown. The edges of the implant body are rounded to reduce pressure on soft tissue and superfluous material thicknesses are reduced to reduce the overall size and prominence of the connector implant. For clamping purposes, the design as shown in Figures 4A to 4E comprises a first slot extension 33 and a second slot extension 34 to increase the flexibility of the pocket walls. The first and second slot extensions are arranged on the opposite side of the pocket with respect to the slot 27. The material around the rod receiving head locking mechanism 60 has been reduced to encompass the rod receiving head locking mechanism 60. The rod receiving head locking mechanism 60 and the material around it form a protrusion, protruding from the remaining part of the implant body 20. In this example, the threaded bolt 65 is arranged obliquely with respect to the top side or bottom side to cross the slot 27. Due to this oblique arrangement, the bolt head 62 with bolt drive 64 of the threaded bolt 65 are directed more upwards towards the user. The bolt drive 64 can be reached easier with a tightening instrument 100 such as a screwdriver. Upon tightening of the threaded bolt 65, the pocket walls 46 deflect to engage with the rod receiving head 81 of the pedicle screw assembly 80. The construct of the rod receiving head and the spinal connector implant will reach the locked state and act as a unity. The slot width SW is forced to become smaller. Similar to Figure 1 D, Figure 4C shows the connector implant 1 with the locking bolt 65 and the set screw 90.

[0060] Figures 4D and 4E show the connector body 10 in a top perspective view and in a bottom perspective view, respectively. As described earlier in connection with Figures 1 A to 1 G, at the body top side 25, the pocket 40 comprises a top side section 41 forming a top side opening 44. At the body bottom side 26 the pocket 40 comprises a bottom side section 43 forming a bottom side opening 45. Between the bottom side section 43 and the top side section 41 , the pocket 40 comprises a middle section 42. The overall pocket further has an inner wall 46. In this example, at least one of the top opening 44 or bottom opening 45 is smaller in width ‘W’ or length ‘L’ than the middle section 42. As a result, a top seat 47 and / or bottom seat 48 for engagement with the rod receiving head 80 is / are formed. In this example, the top side opening 44 (or its diameter) is greater than the outer diameter of a second set screw 85 as described in connection with Figures 5A and 5B.

[0061] Figures 5A and 5B show a typical standard pedicle screw assembly 80. The pedicle screw assembly comprises a rod receiving head 81 with a third rod receiving passage 82, a threaded bone screw 83, a clamping insert 84 and a second set screw 85. The standard principle of operation is as follows. Multiple pedicle screw assemblies are inserted in target vertebral bodies. A rod is inserted in the rod receiving head 81. Upon tightening of the second set screw 85, the insert rigidly locks the bone screw 83 and the rod reiving head, and simultaneously locks the rod against the insert. The whole rod construct becomes stiff / locked and stabilises the spine for fusion.

[0062] Typically, a rod receiving head 80 has a cylindrical basic shape with a rounded or chamfered bottom edge or head bottom seat 86 and a flat front face 87 and rear face 88. Furthermore, the pedicle screw rod receiving head has a top side or head top seat 89. In this example, as a result, the pedicle screw has a diameter which is greater than the distance between the front and rear face.

[0063] Figures 6A to 6I show an example assembly method to assemble the connector implant 1 over the pedicle screw assembly. Some of the method steps may however be carried out in a different order. The advantage of this procedure is that the rod receiving head 81 is fully captured between the pocket inner walls 46 and the connector top seat 47 and connector bottom seat 48 of the spinal connector implant 1 . Any disassembly in any direction is prevented. Figures 6A to 6C show the insertion of the rod receiving head into the connector implant, and in particular into the pocket 40 of the connector implant. Figure 6D shows the engagement of the head top seat 89 with the connector top seat 47. Figures 6E and 6F show the turning of the rod receiving head in the pocket 40. The third and second rod receiving passages 82, 53 can thus be aligned. As depicted in Figures 6G to 6I, upon rotation, also the head bottom seat 86 and the connector bottom seat 48 are arranged for engagement. As a result, the connector implant is arranged in a form-fit manner around the rod receiving head.

[0064] A reduced play or play free assembly between the standard pedicle screw and the connector implant is of high importance. A play free connection inhibits micromotion between the components and the risk of wear and the creation of worn particles. Therefore, the adaptor should preferably be perfectly sized and shaped to fit around the rod receiving head of a standard pedicle screw. Many brands of standard pedicle screws exist featuring similar functionality but having different rod receiving head sizes and shapes. Differences may be for example a smaller diameter, a shorter height, different corner radii, etc. As a result, a connector implant should preferably be sized and shaped differently for different brands or types and therefore is a dedicated addition to a pedicle screw system. Hence the connector implant and the accompanying dedicated pedicle screw form an implant set or an implant kit.

[0065] As described earlier, one of the purposes of the connector implant is to provide a solution to assemble two rods, without increasing the number of available implants with a large number of new implants. Therefore, in one embodiment the first set screw 90 and the second set screw 85 are mutually identical.

[0066] Referring to Figures 7A to 7M, an example surgical flow or method is shown. Figure 7A shows four standard pedicle screw assemblies engaged in four target vertebral bodies. The rod receiving passages are arranged parallel to the spine. Figure 7B shows one first rod receiving head being turned and being arranged at an acute angle in relation to the spine longitudinal direction.

[0067] Figure 7C shows the connector implant located above the turned rod receiving head. The rod receiving passages of the connector implant are arranged at an acute angle in relation to the third rod reiving passage of the pedicle screw assembly. Figure 7D shows how the connector implant is engaged over the rod receiving head. The connector implant is arranged in an intermediate end-position wherein the top seat 47 engages with the top end of the rod receiving head. Figures 7E and 7F show the insertion of an alignment instrument 8 to align the first, second and third rod receiving passages. Figure 7G shows how the pedicle screw assembly is turned 90° towards a position wherein the second and third rod receiving passages are aligned. Figure 7H shows how the rod receiving head locking mechanism 60 is tightened with a tightening tool 7 and the rod receiving head is locked into the pocket of the connector implant. Figures 7I and J show another connector implant being connected to a fourth vertebral body. Figure 7K shows how a rod is fixated in the standard pedicle screw heads. Figure 7L shows the placement of an additional rod 6 into the connector implants 1 . Figure 7M shows the final construct having two parallel rods thereby providing extra stability.

[0068] The above description describes an assembly in which the implant body and the pedicle screw assembly are rotated 90° or substantially 90° with respect to each other. However, other rotation angels may be possible as well. In this example, the rotation of 90° provides the largest seating surface after rotation between the rod receiving head and the connector top seat 47 and connector bottom seat 48.

[0069] Figures 8A and 8B show another variant of the spinal connector implant and accompanying pedicle screw assembly design. In this example, the rod receiving head is fully or substantially fully cylindric, and therefore the bayonet kind of locking mechanism as described in connection with Figures 6A to 6I won’t allow the rod receiving head to be locked at both ends. In this example, the rod receiving head has an indent or recess, which is used as a locking feature. Therefore, in this example the rod receiving head locking mechanism 60 of the implant connector 1 is configured to directly engage with the rod receiving head 81 to reach the locked status. By pressing the rod receiving head 81 against the pocket inner walls, the rod receiving head is blocked by a force fit and / or a form fit. In this example, the locking bolt 65 engages in a recess 79. In the design of Figures 8A and 8B, no slot 27 in the implant body 20 is necessary and the implant body is thus in this case devoid of a slot, which would divide the implant body into two implant body portions.

[0070] Figures 9A and 9B show another variant of the spinal connector implant. In this variant, the implant body 20 comprises a slot or gap 27 with a slot width SW, wherein the slot 27 is at least extending into the pocket 40 and is starting at the body third side 23. The slot extends in the length direction of the implant body towards the body fourth side 24. Furthermore, the slot extends in this configuration parallel or substantially parallel to the top and / or bottom sides as opposed to extending vertically, i.e. , extending orthogonally or substantially orthogonally to the top and / or bottom sides as in the above configurations. Also in this variant the rod receiving head locking mechanism 60 bridges or crosses the slot 27.

[0071] Figures 10A and 10B show another variant of the spinal connector implant. In this variant, the implant body 20 comprises at least two vertically directed or oriented connector extensions 73. In other words, these connector extensions extend along the longitudinal or extension direction of the respective body side. The extended connector facilitates simplified rod alignment handling during implantation. After a spinal posterior system has been implanted and the rod rigidly fixated, these extensions are removed. To allow the surgeon to remove the extensions, the extension comprises defined breaking reliefs or regions or grooves 74. In this example, the extension also comprises an internal thread 75, which is sized and shaped to engage with, or receive a set screw 90.

[0072] Figures 11A and 11B show another variant of the spinal connector implant. Similar to the connector implant as described in connection with Figures 8A and 8B, in this example, the rod receiving head locking mechanism 60 of the connector implant 1 is configured to directly engage with the rod receiving head to reach the locked status. By pressing the rod receiving head against the pocket inner walls, the rod receiving head is blocked by a force fit connection and / or a form fit connection. In this example, the locking bolt 65 is configured to engage against the rod receiving head. Furthermore, in this example the rod receiving head locking mechanism 60 is arranged under the first rod receiving passage 50 and can be operated from the fourth body side 24. Figures 12A to 12C show another variant of the spinal connector implant. Similar to the variant as described in connection with Figures 4A to 4E, the implant body 20 comprises a slot 27 with a slot width SW dividing the implant body 20 into a first implant body portion 30 and a second implant body portion 31 thereby forming a compliant clamping structure. In this variant, the rod receiving head locking mechanism 60 and the material around it form a protrusion, which is protruding from the first body side 21 or the second, opposite body side 22. The slot 27 extends through the protrusion and is directed substantially vertically.

[0073] The rod receiving head locking mechanism 60 comprises the threaded bolt 65 with the bolt head 62, and a first, threaded hole 70 having a first central axis, and a second hole 71 (in this example unthreaded) having a second central axis in the implant body 20. The first and second central axes or their extensions coincide in the implant body portion 20, wherein upon tightening of the threaded bolt, it engages with the threaded hole while the bolt head rests against the bolt seat 72 of the second hole to thereby reduce the slot width SW. By tightening the threaded bolt, the pocket inner walls 46 are forced to approach each other thereby reducing the internal diameter of the pocket, and as a result the rod receiving head will be clamped / rigidly locked.

[0074] Figure 12C shows the threaded bolt arranged to be operated from the third side 23. Alternatively, the threaded bolt could be arranged to be operated from the fourth side 24. In such an arrangement, the threaded hole 70 and the second hole 71 are reversed.

[0075] Figures 13A and 13B show another variant of the spinal connector implant. This variant is similar to the variant described in connection with Figures 12A to 12C. The implant body 20 of the variant of Figures 13A and 13B comprises a slot 27 with a slot width SW dividing the implant body 20 into a first implant body portion 30 and a second implant body portion 31 but thereby creating two physically separate or independent implant body portions. In this variant, two rod receiving head locking mechanisms 60 and the material around it form two protrusions, which are protruding from the first body side 21 and the second, opposite body side 22. The slot 27 extends through both of the protrusions. Figure 13A shows the threaded bolt arranged to be operated from the third side 23. Alternatively, the threaded bolt may be arranged to be operated from the fourth side 24. In such an arrangement the threaded hole 70 and the second hole 71 are reversed. Alternatively, the operational end of the bolts may be directed to different sides.

[0076] Figures 14A to 14C show another variant of the spinal connector implant.

[0077] Similar to the variant as described in connection with Figures 4A to 4E, the implant body 20 comprises a slot 27 with a slot width SW dividing the implant body 20 into a first implant body portion 30 and a second implant body portion 31 thereby forming a compliant clamping structure. The slot of this variant starts in the pocket 40 and extends to the fourth body side 24. In this example, the slot is substantially vertically oriented. Alternatively, the slot may be obliquely oriented. Preferably, the slot ends at the bottom and top side of the implant body. In this variant, the rod receiving head locking mechanism 60 is arranged adjacent to the first rod receiving passage 50. The rod receiving head locking mechanism 60 comprises the threaded bolt 65 with the bolt head 62, and a first, threaded hole 70 having a first central axis, and a second hole 71 (in this example unthreaded) having a second central axis in the implant body 20. The first and second central axes or their extensions coincide in the implant body portion 20, wherein upon tightening of the threaded bolt, it engages with the threaded hole while the bolt head rests against the bolt seat 72 of the second hole to thereby reduce the slot width SW. By tightening the threaded bolt, the pocket inner walls 46 are forced to approach each other thereby reducing the internal diameter of the pocket, and as a result the rod receiving head will be clamped / rigidly locked. Figures 14A to 14C show the threaded bolt arranged to be operated from the first side 21. Alternatively, the threaded bolt may be arranged to be operated from the second side 22.

[0078] Figures 15A and 15B show another variant of the spinal connector implant. Similar to the variant as described in connection with Figures 14A to 14C, the implant body 20 comprises a slot 27 with a slot width SW dividing the implant body 20 into a first implant body portion 30 and a second implant body portion 31 thereby forming the compliant clamping structure. The slot of this variant starts in the pocket 40 and initially extends towards the fourth body side 24 and extends beyond the rod receiving head locking mechanism 60 to deviate towards the first body side 21 . In this example, the slot is substantially vertically oriented. Alternatively, the slot may be obliquely oriented. Preferably, the slot ends at the bottom and top side of the implant body. In this variant, the rod receiving head locking mechanism 60 is arranged adjacent to the first rod receiving passage 50. Similar to the description in connection with Figures 14A to 14C, by tightening the threaded bolt, the pocket inner walls 46 are forced to approach each other thereby reducing the internal diameter of the pocket, and as a result the rod receiving head will be clamped / rigidly locked. Figures 15A and 15B show the threaded bolt arranged to be operated from the first side 21 . Alternatively, the threaded bolt may be arranged to be operated from the second side 22.

[0079] Figures 16A to 16C show another variant of the spinal connector implant. Figure 16A shows the spinal connector implant in an assembled view, and Figures 16B and 16C show the spinal connector implant in an exploded view. This variant of the connector implant comprises a main implant body 20, a locking bolt 65, and a sliding locking element 100, also referred to as a slider 100. Referring to the connector body, the connector body primarily comprises the same elements as described in connection with the previous described connector variants, except for the slot 27. Additionally, the connector body 20 comprises a guiding rail 102 which is arranged below the first rod receiving passage 50 at the body bottom side 26. Furthermore, the connector body comprises a threaded hole 70 which intersects with the rail 102. In this example, the threaded hole 70 extends from the first rod receiving passage 50 towards the rail 102 which is sized and shaped to receive the slider 100.

[0080] The principle of operation of this variant is different as described next. Some of the steps may however be carried out in a different order. According to this variant, the slider 100 acts as an intermediate component to transfer the tightening forces of the locking bolt to the rod receiving head to block the rod receiving head in the pocket 40. In this example, the slider 100 is a T-shaped body 101 or sliding block, sized and shaped to fit in a complementary manner in a T-slot or rail 102 of the implant body 20. The form fit inhibits unwanted separation of both components. It is understood that other shapes of connections can provide the same sliding function, such as for example pin-in-hole connections, dove-tail connections, quadratic connections, etc. The slider 100 comprises a clamping face 103 to engage with the rod receiving head of the pedicle screw assembly. In this example the clamping face 103 is sized and shaped to engage with the outside of the rod receiving head, more specifically in this example against the cylindrical outside and under the bottom of the rod receiving head. Therefore, the clamping face forms a combined bottom seat 104 and side seat 105.

[0081] The slider further comprises an oblique engagement face 101 for engagement with the tip 106 of the locking bolt. Upon tightening of the locking bolt, the contact or interaction between the oblique engagement face 101 of the slider and the converging tip 106 of the locking bolt, will transform the substantially vertically directed axial displacement of the locking bolt in a substantially horizontally oriented displacement of the slider (i.e. , these two displacement directions are in this example substantially mutually orthogonal). By means of this combined engagement, the rod receiving head is pressed against the pocket inner wall 46, more specifically against the pocket inner wall adjacent to the third body side 23, and is thus pressed upwards against the connector top seat 47.

[0082] Referring to Figures 17A to 17D, the mechanism of clamping as described in connection with Figures 16A to 16C is shown in greater detail. Figures 17A and 17B show a partial cross-sectional view through the connector body along its length, with a pedicle screw assembly engaged in the pocket 40. Figures 17C and 17D show the same partial cross-sectional view, but without the pedicle screw assembly.

[0083] Figures 17A and 17C depict the slider 100 and the locking bolt 65 in a start position or unlocked state. The slider is arranged outside of the pocket 40, and therefore the pedicle screw assembly can be assembled into the pocket or is loosely engaged in the pocket. Figures 17B and 17D show the locking bolt being tightened in the threaded hole 70. Upon tightening of the locking bolt, the contact or interaction between the oblique engagement face 104 of the slider and the converging tip 106 of the locking bolt, will transform the substantially vertically directed axial displacement ‘VD’ of the locking bolt in a substantially horizontally directed displacement ‘HD’ of the slider. As a result, the slider moves into the pocket into an end position and will exert a clamping force on the rod receiving head of the pedicle screw assembly. The connector is in a locked state. As depicted, in the end position, the locking bolt is completely countersunk in the rod receiving passage 53 and does not interfere with the rod to be placed in the first rod receiving passage.

[0084] An advantage of this example connector implant is that the operational side of the locking bolt 65 is directed upwards and easily accessible during surgery. One other advantage is that no turning of the pedicle screw assembly in relation to the connector implant as described in connection with Figures 7A to 7M is required.

[0085] Referring to Figures 18A to 18D, an example surgical flow or method is shown. Figures 18A and 18B show the placement of the connector implant over a rod receiving head of a pedicle screw assembly. Figure 18C shows the engagement of a tightening tool into the drive of the locking bolt 65. Figure 18D shows the tightening step, wherein the locking bolt translates deeper into the threaded hole, and the slider is forced to translate against the rod receiving head of the pedicle screw.

[0086] Figures 19A and 19B show another variant of the spinal connector implant. Similar to the variant as described in connection with Figures 4A to 4E, the implant body 20 comprises a slot 27 with a slot width SW dividing the implant body 20 into a first implant body portion 30 and a second implant body portion 31 thereby forming a compliant clamping structure. The slot of this variant starts in the pocket 40 and extends to the third body side 23. In this example, the slot is substantially vertically oriented. Alternatively, the slot may be obliquely oriented. Preferably, the slot ends at the bottom and top side of the implant body. In this variant, the rod receiving head locking mechanism 60 protrudes from the third body side 23 and comprises a first threaded bore 111 having a first-handed thread 112 and a second threaded bore 113 having a secondhanded thread 114. The rod receiving head locking mechanism 60 comprises the threaded bolt 65 or a grub screw 110. The threaded bolt comprises two complementarily sized and shaped thread sections, respectively having left-handed external thread 115 and a right-handed external thread 116. Due to the oppositely handed threads being engaged in the threaded bores at the opposite sides of the slot 27, upon turning of the threaded bolt, the slot 27 is either expanded or reduced. Therefore, by tightening the threaded bolt, the pocket inner walls 46 are forced to approach each other thereby reducing the internal diameter of the pocket, and as a result, the rod receiving head will be clamped / rigidly locked. The handedness of the threads may also be reversed.

[0087] Figures 20A to 20D show another variant of the spinal connector implant. The implant body 20 comprises a slot 27 with a slot width SW dividing the implant body 20 into a first implant body portion 30 and a second implant body portion 31 thereby forming a compliant clamping structure. The slot of this variant starts in the pocket 40 and extends to the third body side 23. In this example, the slot is substantially vertically oriented. Alternatively, the slot may be obliquely oriented. Preferably, the slot ends at the bottom and top side of the implant body. In this variant, the rod receiving head locking mechanism 60 protrudes from the third body side 23 and forms an inner cam 120. The inner cam 120 has a cam height A and a cam width B. The cam height A is smaller than the cam width B. The difference may for example be 0.5 mm to 1 .5 mm. The slot 27 extends substantially centrally through the cam and thereby divides the cam in a first cam portion 121 and a second cam portion 122. The inner cam 120 is captured in a substantially complementarily shaped cam latching aid 123. The cam latching aid 123 comprises a central recess 124 which has a recess length C and recess width D. The recess length C is substantially equal to the cam height A. The recess width D is substantially equal to the cam width B. In this example, the cam latching aid outer geometry is shaped as a nut and can be operated by means of turning with a tool or instrument. Figures 20C and 20D show the operation and tightening mechanism of this variant of the rod receiving head locking mechanism. In the unlocked or loose state, the recess length C overlaps the cam height A, and the recess width D overlaps the cam width B. In this state, the slot 27 is more open. Now, a turning motion of approximately 90° of the cam latching aid towards the locked state will force the recess length C to overlap the cam width B, and subsequently will force the recess width D to overlap the cam height A. Due to the difference in size of the cam height A and the cam width B, the slot 27 is forced to close. Therefore, the pocket inner walls 46 are forced to approach each other thereby reducing the internal diameter of the pocket, and as a result, the rod receiving head will be clamped / rigidly locked. The handedness of the threads may also be reversed. Although the principle is shown to be operated from the third body third side 23, by rearranging the slot and the rod receiving head locking mechanism 60 for example to the first body side 21 , or the second body side 22, or the fourth body side 24, the same functionality can be achieved.

[0088] Figures 21 A to 21C show yet another variant of the spinal connector implant. Similar to the previous variants, the implant body 20 comprises a slot 27 with a slot width SW dividing the implant body 20 into a first implant body portion 30 and a second implant body portion 31 thereby forming a compliant clamping structure. The slot of this variant starts in the pocket 40 and extends to the third body side 23. In this example, the slot is substantially vertically oriented. Alternatively, the slot may be obliquely oriented. Preferably, the slot ends at the bottom and top side of the implant body. In this variant, the connector body portion of the rod receiving head locking mechanism 60 protrudes from the third body side 23 and is sized as a conical or converging or tapered protrusion 130. The tapered protrusion 130 comprises an external tapered thread 131. In this example, the slot 27 extends substantially centrally through the threaded tapered protrusion 130. Moreover, Figures 21 A and 21 B show a locking aid 132 which is sized and shaped as a locking nut 133. In this example, the locking nut has a hexagonal geometry which is sized and shaped to be operated by turning with a tool or instrument. The locking nut comprises a tapered internal thread 134. The tapered internal thread is shaped complementarily to the external tapered thread 131 . The largest internal thread outer diameter IOD of the locking nut is smaller than the largest external thread outer diameter EOD of the threaded tapered protrusion 130.

[0089] Due to the tapered shape and the diameter difference of the tapered threads, the threads will wedge as soon as the threads engage. Now, upon forceful tightening of the locking nut, the slot 27 is forced to close. Therefore, the pocket inner walls 46 are forced to approach each other thereby reducing the internal diameter of the pocket, and as a result, the rod receiving head will be clamped / rigidly locked.

[0090] Figure 21 C shows a variant of the same principle. The connector according to this variant comprises a tapered protrusion140 combined with a cylindrical extension 141 comprising a cylindrical external thread 142. Moreover, the locking nut comprises a complementarily shaped cylindrical internal thread 143 and a tapered internal engagement face 144. Also, upon forceful tightening of the locking nut, the slot 27 is forced to close. Although the principle as shown in Figures 21 A to 21C depicts the connector implant to be operated from the third body side 23, it is apparent that by rearranging the slot and the rod receiving head locking mechanism 60 for example to the first body side 21 , or the second body side 22, or the fourth body side 24, the same functionality can be achieved.

[0091] Figures 22A to 22D show yet another variant of the spinal connector implant. Figure 22A shows the spinal connector implant in a combined assembled view and in detailed view. Figures 22B and 22C show the spinal connector implant in a bottom perspective view showing the movement of the rod receiving head locking mechanism 60. This variant of the connector implant comprises a main implant body 20, and a locking cam or excentre element 150. Referring to the connector body, the connector body primarily comprises the same elements as described in connection with the previously described connector variants, except for the slot 27. Additionally, the connector body 20 comprises an assembly recess 151 for the locking cam element 150, which is arranged below the first rod receiving passage 50 at the body bottom side 26. In this example, the connector body and the locking cam element 150 are linked by a pin- in-hole in groove connection 152, which only allows the rotation of the locking cam element 150 whilst being fixedly connected to the connector body.

[0092] The principle of operation of this variant is described next. According to this variant, the locking cam element 150 acts as a component to transfer tightening forces to the rod receiving head to block the rod receiving head in the pocket 40. The locking cam element 150 comprises a clamping face 103 to engage with the rod receiving head of the pedicle screw assembly. In this example, the clamping face 103 is sized and shaped to engage with the outside of the rod receiving head, more specifically, in this example against the cylindrical outside and under the bottom of the rod receiving head. Therefore, the clamping face forms a combined bottom seat 104 and side seat 105. The locking cam element 150 further comprises a drive 154 to be operated with a turning tool. Upon turning the locking cam element 150, the contact or interaction between the clamping face 103 and the rod receiving head will press the rod receiving head against the pocket inner wall 46, more specifically against the pocket inner wall adjacent to the third body side 23, and is thus pressed upwards against the connector top seat 47.

[0093] To summarise the above teachings, one aspect of the invention proposes a spinal connector implant 1 for connecting and / or aligning at least a first rod 5 with a second rod 6. The connector implant 1 comprises an implant body 20 having a body length, a body width and a body height, the body length and the body height defining a first body side 21 , and a second, opposite body side 22, the body width BW and body height BH defining a third body side 23, and a fourth, opposite body side 24, the body length BL and the body width BW defining a body top side 25 and a body bottom side 26. The implant body 20 comprises: a pocket 40, arranged at the third body side 21 , the pocket extending from the body top side 25 to the body bottom side 26, the pocket 40 being sized and shaped to engage over the rod receiving head 81 of a pedicle screw assembly 80, and wherein the pocket 40 comprises a top side section 41 forming a top opening 44, a middle section 42, and a bottom side section 43 forming a bottom opening 45, and wherein the pocket 40 has an inner wall 46; at least a first rod receiving passage 50 which is intersecting a first rod locking mechanism portion 51 , wherein the first rod receiving passage 50 extends from the first body side 21 to the second body side 22 and is open towards either the body top side 25 and / or the fourth body side 24; and a first head locking mechanism 60 providing a locked state and unlocked state, the first head locking mechanism 60 being configured to rigidly lock the rod receiving head 81 against at least a portion of the inner wall 46 of the pocket 40. In unlocked state, the rod receiving head 81 is movably engaged in the pocket 40 for assembly and / or orientation purposes, and wherein in a locked state, the rod receiving head 81 is fixed engaged in the pocket 40 and forms a unit with the connector implant 1.

[0094] While the invention has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive, the invention being not limited to the disclosed embodiments. Other embodiments and variants are understood and can be achieved by those skilled in the art when carrying out the claimed invention, based on a study of the drawings, the disclosure and the appended claims. New embodiments or variants may be obtained by combining any of the above teachings.

[0095] In the claims, the word “comprising” or ’’including” does not exclude other elements or steps, and the indefinite article “a” or “an” does not exclude a plurality. The mere fact that different features are recited in mutually different dependent claims does not indicate that a combination of these features cannot be advantageously used. Any reference signs in the claims should not be construed as limiting the scope of the invention.

Claims

CLAIMS1 . A spinal connector implant (1 ) for connecting and / or aligning at least a first rod (5) with a second rod (6), the connector implant (1 ) comprising an implant body (20) having a body length (BL), a body width (BW) and a body height (BH), the body length (BL) and the body height (BH) defining a first body side (21 ), and a second, opposite body side (22), the body width (BW) and body height (BH) defining a third body side (23), and a fourth, opposite body side (24), the body length (BL) and the body width (BW) defining a body top side (25) and a body bottom side (26), the implant body (20) comprising:- a pocket (40), arranged at the third body side (23), the pocket extending from the body top side (25) to the body bottom side (26), the pocket (40) being sized and shaped to engage over a rod receiving head (81 ) of a pedicle screw assembly (80), and wherein the pocket (40) comprises a top side section (41 ) forming a top opening (44), a bottom side section (43) forming a bottom opening (45), and a middle section (42) between the top and bottom side sections, and wherein the pocket (40) has an inner wall (46);- at least a first rod receiving passage (50) intersecting a first rod locking arrangement (51 ), wherein the first rod receiving passage (50) extends from the first body side (21 ) to the second body side (22) and is open to the body top side (25) and / or to the fourth body side (24); and- a rod receiving head locking mechanism (60) providing a locked state and unlocked state, the rod receiving head locking mechanism (60) being configured to rigidly lock the rod receiving head (81 ) against at least a portion of the inner wall (46) of the pocket (40) in the locked state, wherein in the unlocked state, the inner wall of the pocket is arranged to loosely engage the rod receiving head (81) to enable the rod receiving head (81) to be moved and / or manipulated in the pocket (40) for assembly and / or orientation purposes, and wherein in the locked state, the inner wall of the pocket is arranged to rigidly engage the rod receiving head (81) to fix the rod receiving head (81) in the pocket to thereby enable for the spinal connector implant to form a rigid unit with the pedicle screw assembly (80).

2. The spinal connector implant (1 ) according to claim 1 , wherein the first rod locking arrangement (51) is configured as a threaded hole (52) to threadedly engage with a first set screw (90) comprising a thread (91 ) and a first drive feature (92).

3. The spinal connector implant (1 ) according to any one of the preceding claims, wherein the rod receiving head locking mechanism (60) in the locked state is configured to directly engage the rod receiving head (81 ).

4. The spinal connector implant (1) according to claim 1 or 2, wherein the rod receiving head locking mechanism (60) in the locked state is configured to directly engage with an intermediate slider (100), which is configured to engage with the rod receiving head (81 ).

5. The spinal connector implant (1) according to claim 4, wherein in the locked state, a locking bolt (65) is arranged closer to the bottom side (26) and the slider (100) is arranged further into the pocket (40) than in the unlocked state.

6. The spinal connector implant (1 ) according to claim 5, wherein the locking bolt (65) is arranged in a threaded hole (70) which intersects with the first rod receiving passage (50).

7. The spinal connector implant (1 ) according to any one of the preceding claims, wherein the implant body (20) comprises a slot or gap (27) with a slot width (SW), wherein the slot extends in the length direction of the connector implant at least to the pocket (40), wherein in the locked state, the rod receiving head locking mechanism (60) bridges or crosses the slot (27), and wherein the slot starts at the body top side (25) and ends at the body bottom side (26), or wherein the slot starts at the body third side (23) and extends at least to the pocket.

8. The spinal connector implant (1 ) according to any one of the preceding claims, wherein the implant body (20) comprises a slot (27) dividing the implant body (20) into a first implant body portion (30) and a second implant body portion (31) thereby forming a compliant clamping structure such that the slot defines a gap between the first and second implant body portions, and wherein in the locked state, the gap is more closed or substantially closed, and in the unlocked state, the gap is less closed.

9. The spinal connector implant (1) according to claim 7 or 8, wherein the slot (27) extends from the third body side (23) to the pocket (40), and wherein the implantbody (20) comprises one or more slot extensions (34) extending from the pocket towards the fourth body side (26).

10. The spinal connector implant (1 ) according to any one of claims 1 to 3, wherein the implant body (20) comprises a slot (27) starting in the pocket (40) and ending at the first or second or fourth body side (21 , 22, 24).

11. The spinal connector implant (1 ) according to any one of claims 1 to 3, wherein the implant body (20) comprises a slot (27) starting in the pocket (40) and initially extending to the fourth body side (24) and ending at the first or second body side (21 , 22).

12. The spinal connector implant (1) according to any one of the preceding claims, wherein the implant body (20) comprises at least one first implant body portion (30) and one second implant portion (31) separated by a slot (27), and wherein the first and second implant body portions are connected by a rotating hinge (32).

13. The spinal connector implant (1) according to any one of the preceding claims, wherein the implant body (20) comprises a slot (27) with a slot width (SW) dividing the implant body (20) into a first implant body portion (30) and a second implant body portion (31) thereby forming a compliant clamping structure, wherein the rod receiving head locking mechanism (60) comprises a threaded bolt (65) with a bolt head (65), and a first, threaded hole (70) having a first central axis, and a second hole (71) having a second central axis in the implant body (20), wherein the first and second central axes or their extensions coincide in the implant body portion (20), wherein upon tightening of the threaded bolt, it engages with the threaded hole while the bolt head rests against a bolt seat (72) of the second hole to thereby reduce the slot width (SW).

14. The spinal connector implant (1) according to any one of the preceding claims, wherein the top opening (44) and / or bottom opening (45) is / are smaller in cross- sectional width or length than the cross-sectional width or length of the middle section (42) and forms a connector top seat (47) and / or connector bottom seat (48) for engagement with the rod receiving head (80).

15. The spinal connector implant (1) according to any one of the preceding claims, wherein the implant body (20) comprises a second rod receiving passage (53)extending from the first body side (21 ) to the second body side (22) and is open to the body top side (25), and intersects the pocket (40), and wherein in the locked state, the second rod receiving passage (53) overlaps or aligns with a third rod receiving passage (82) of the pedicle screw assembly (80).

16. The spinal connector implant (1) according to any one of the preceding claims, wherein the rod receiving head locking mechanism (60) comprises a threaded bolt (65) having a central axis, which is non-parallel with respect to the top and / or bottom side (25, 26).

17. The spinal connector implant (1 ) according to any one of the preceding claims, wherein the implant body (20) comprises at least two vertically oriented connector extensions (73).

18. The spinal connector implant (1 ) according to claim 17, wherein the extensions comprise an internal thread (75) sized and shaped to receive a set screw 90.

19. The spinal connector implant (1 ) according to claim 17 or 18, wherein the extensions comprise a breaking relief (74).

20. A spinal connector implant assembly comprising the spinal connector implant (1) according to any one of the preceding claims, wherein the assembly further comprises a pedicle screw assembly, and wherein the pocket (40) of the spinal connector implant (1) is sized and shaped to receive the rod receiving head (81) in a substantially play free manner.

21. A kit comprising the spinal connector implant (1) according to any one of claims 1 to 19, wherein the kit further comprises an assembly aid instrument (8) to align a second rod receiving passage (53) of the implant body (20) with a third rod receiving passage (82) of the pedicle screw assembly (80).

22. The kit according to claim 21 , wherein the kit further comprises an tightening instrument (7) to manipulate the rod receiving head locking mechanism (60).

23. The kit or assembly according to any one of claims 20 to 22, wherein the kit or assembly comprises at least two spinal connector implants (1) according to anyone of claims 1 to 19, wherein the at least two spinal connector implants are mutually mirrored designs for a right-side spinal column application and a left-side spinal column application.

24. A method of stabilising a spinal column by using at least a first spinal connector implant (1 ) and a second, different spinal connector implant (1 ) according to any one of claims 1 to 11 , the implant bodies (20) of each of the first and second spinal connector implants (1 ) further comprising a respective second rod receiving passage (53), the method comprising:- inserting a first pedicle screw assembly (80) comprising a first rod receiving head (81 ) in a first vertebral body, and a second, different pedicle screw assembly (80) comprising a second rod receiving head (81 ) in a second, different vertebral body;- engaging the first spinal connector implant (1 ) over the first rod receiving head (81 ), and the second spinal connector implant (1 ) over the second rod receiving head (81 );- aligning the respective second rod receiving passage (53) with a respective third rod receiving passage (82) of the respective pedicle screw assembly (80);- locking the first spinal connector implant (1 ) with the first rod receiving head (81 ), and the second spinal connector implant (1 ) with the second rod receiving head (81 );- placing a first spinal rod (5) in the respective second and third rod receiving passages (53, 82);- locking the first spinal rod (5) in the respective second and third rod receiving passages (53, 82) using respective set screws (85);- placing a second rod (6) in the respective first rod receiving passages (50); and- locking the second spinal rod (6) in the respective first rod receiving passages (50) using respective set screws (90).

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