An implant, especially a spinal implant

Abstract

The invention relates to a spinal implant in the form of a multi-part connection device for connecting a fastening element, in particular a pedicle screw, to a connecting element, in particular a connecting rod of a spinal support, comprising a first part in the form of a saddle having a receptacle for a part of the fastening element, and a second part in the form of a tulip-shaped cup having a receptacle for the connecting element in an axially upper region and surrounding the receptacle of the saddle in its axially lower region, wherein the saddle is axially movable in the tulip-shaped cup when assembled in a predetermined orientation, so that when moving in the direction of the upper region the saddle is able to receive a part of the fastening element in a receiving position, and when moving in the direction of the lower region the saddle is no longer able to release the received part of the fastening element in a retaining position. The axial guide for axial movement includes a protruding area located on the outer surface of the saddle when viewed radially, which is engaged in a recessed area on the inner surface of the tulip-shaped cup (1) when viewed radially; when viewed from an azimuth angle, the end areas of the protruding area are spaced apart by at least 18°; and includes an axial lock that prevents the protruding area from axially exiting the groove area toward the upper area; and includes a rotation lock that prevents the protruding area from rotating into the groove area and preventing the protruding area from rotating out of the recessed area during assembly.

Description

Technical Field

[0001] The invention relates to an implant, in particular a spinal implant, in the form of a multi-part connection device for connecting a fastening element, in particular a pedicle screw, to a connecting element, in particular a connecting rod of a spinal support, comprising a first part in the form of a saddle having a receptacle for a part of the fastening element, and a second part in the form of a tulip-shaped cup having a receptacle for the connecting element in an axially upper region and a receptacle surrounding the saddle in an axially lower region, wherein, in an assembled state in which the saddle has been mounted in the tulip-shaped cup in a predetermined orientation, the saddle can be axially moved in the tulip-shaped cup so that when moving in the direction of the upper region, the saddle in the receiving position can receive a part of the fastening element and so that when moving in the direction of the lower region, the saddle in the retaining position can no longer release the received part of the fastening element. The axial guide for axial movement includes a protruding area located on the outer surface of the saddle when viewed radially, which engages in a groove area on the inner surface of the tulip cup when viewed radially; the end areas of the protruding area are spaced apart by at least 18°, preferably at least 24°, when viewed from an azimuth angle; and includes an axial lock that prevents the protruding area from axially leaving the groove area in the direction of the upper area. Background Art

[0002] Such implants are known, in particular as spinal implants for spinal support systems, and are described, for example, in US 9,486,246 B2. In short, two or more vertebrae are to be connected by a spinal support. To this end, a pedicle screw is screwed into the vertebra in a known manner and rigidly connected to, for example, a connecting rod by an implant of the type mentioned above, to which the other vertebrae are in turn connected by pedicle screws and by implants in the form of the same or similar connecting means. This rigid connection is obtained starting from the above-mentioned holding position, in which, in addition, the saddle is pressed against the sleeve-shaped tulip cup by applying an axial force, which can be achieved by a locking screw screwed into the tulip cup, and at this time the clamping force acts directly on the saddle, or indirectly on the saddle through the connecting rod, wherein, for example, the clamping force on the pedicle screw head is obtained by the conical design of both the lower area of ​​the tulip cup and the receiving area of ​​the saddle, thereby achieving a rigid coupling between the pedicle screw and the connecting rod.

[0003] In order to insert the pedicle screw into the connection device, the saddle can be moved axially from the holding position into the receiving position. There, the receiving area of ​​the saddle has more radial space available for expansion and in this position the receiving part of the saddle can engage around the head of the pedicle screw, for example by a clamping action. In the receiving position, the axial alignment of the pedicle screw relative to the connection device can still be freely adjusted within a certain range (polyaxial connection), and this is also the case in the holding position, as long as there are no excessive axial forces. With this design, the connection device can be easily used and the surgeon can achieve the correct positioning of all parts of the spinal support before the final fixation under given conditions.

[0004] In the above-mentioned US 9,486,246 B2, the axial guide is also provided on the saddle in the form of a projection which engages in a recess in the tulip cup. The projection is in the form of a swivel lug in order to correctly assemble the saddle with the tulip cup for the operating state. In the latter, the cutout between the conventional U-shaped side wall of the tulip cup and the likewise U-shaped support area of ​​the saddle for the connecting rod is oriented in the assembled state so that the connecting rod passes through the U-shaped opening of the tulip cup on one side and rests on the U-shaped support of the saddle on the other side. Since the pedicle screw is also inserted during use, for example, through the lower opening of the tulip cup and is received by the saddle, an axial locking is provided which reliably prevents the saddle from protruding axially upwards from the tulip cup, which is achieved in the above-mentioned prior art by a shoulder which delimits the recess and against which the projection / swivel lug of the saddle rests. To prepare this type of connection for use, the rotating lug, starting from the orientation of the saddle relative to the tulip cup, is rotated 90° relative to the operating state, inserted axially into the tulip cup and then screwed into the recess of the tulip cup, viewed in this direction of rotation. Summary of the invention

[0005] The object of the present invention is to improve an implant in the form of a connection device of the type mentioned at the outset, in particular with regard to its reliability.

[0006] This object is achieved by the invention of a further improved implant of the type described above, which is mainly characterized by a rotation lock which prevents the protruding region from rotating into the recessed region and which prevents the protruding region from rotating out of the recessed region in the assembled state.

[0007] The present invention thus differs from the teaching of the above-mentioned US 9,486,246 B2 in that the inward (outward) rotation provided for the rotation lugs is specifically prevented. In the context of the present invention, it has been found that in the embodiment according to the invention an increased positional stability of the orientation of the tulip cup and the saddle is achieved, which has a positive effect, in particular when the spinal support is worn for many years, increasing the positional stability of the entire spinal support, thus avoiding premature readjustments, which are uncomfortable for the wearer.

[0008] The explanations given above about the multiaxial coupling, the receiving position and the holding position also apply to the present invention. This means that in use, i.e. during implantation, the connection device in the assembled state can be placed on the head of the multiaxial screw, wherein in a preferred variant, the receiving area of ​​the saddle is clamped onto the screw head (in the receiving position). If the screw and the tulip cup are subjected to force in different directions (holding position), the lower area of ​​the saddle is close to the lower part of the sleeve-shaped tulip cup, and the pedicle screw can no longer be axially disengaged from the lower opening of the tulip cup, but the head can still be rotated in the receptacle, which is equivalent to the tulip cup rotating relative to the pedicle screw (multiaxial adjustment option). Only when the connecting rod inserted into the tulip cup / saddle has been firmly coupled, for example by locking screws, the clamping force of the interaction of the tulip cup and the saddle can ensure that the screw head is firmly clamped and thus ensure a rigid coupling between the pedicle screw and the connecting rod of the spinal support.

[0009] The protruding area will preferably protrude from a wall-like saddle area, which itself is planar and curved, in particular with a circular cross section relative to the axial direction. In a particularly preferred embodiment, the arc length between the azimuthal end areas of the protruding area is a multiple of the axial dimension of the protruding area, preferably at least twice, more preferably at least three times, and even more preferably at least four times.

[0010] In a particularly preferred embodiment, two such axial guides are provided, in particular offset by 180°, in particular symmetrically. The two axial guides and their end regions ensure that the saddle is guided in the tulip-shaped cup, at least in the region of the end points of an "X" seen in cross section, the center of which passes through the axial axis and whose vertical direction is rotated 90° relative to the connecting rod position.

[0011] In a preferred embodiment, the tulip-shaped cup has two azimuthally spaced side walls in the upper region, between which the receptacle for the connecting element is located. A recessed region for the axial guide is arranged in each side wall. When viewed in cross section, these side walls are preferably also curved, more preferably circular.

[0012] Preferably, a thread for screwing in a locking screw is provided on the inner surface of the side wall, by which an axial force can be exerted on the saddle, in particular via the connecting element. However, in principle, an embodiment in which the side wall of the tulip-shaped cup has an external thread and a nut is screwed on is also conceivable.

[0013] In a particularly preferred embodiment, the saddle has, on the face facing away from its seat, two walls arranged in a predetermined direction corresponding to the side walls and each carrying a projecting area of ​​a respective axial guide. A free space is also formed between these walls, preferably U-shaped in axial section, which, when corresponding to a corresponding free space of the tulip-shaped cup, can form a receiving channel for the connecting rod.

[0014] To produce the assembled state, the saddle is inserted into the tulip-shaped cup from above, ie from the axial upper region (ie the side facing away from the receptacle for a part of the fastening element), in the axial direction of the axial guide (axial entry).

[0015] In a particularly preferred embodiment, the wall of the saddle has an elastic resilience against radially inwardly directed bending, which allows the saddle to be axially inserted into the tulip cup by overcoming the axial locking when the assembled state is produced. This facilitates axial assembly without significant plastic deformation of the components.

[0016] In a preferred embodiment, the threads on one or both side walls have cutouts that facilitate axial entry of the saddle into the tulip-shaped cup. This facilitates axial insertion while maintaining a compact design with respect to radial dimensions.

[0017] Furthermore, it is preferred that the azimuthal end regions of one or both protruding regions are spaced apart by at least 30°, preferably by at least 36°, more preferably by at least 42°, which further increases the guiding stability of the axial guide.

[0018] In a preferred embodiment, the recessed area has a shape which is complementary at some points or completely to the shape of the protruding area when viewed in a cross section orthogonal to the axial direction, which avoids interference with the axial mobility.

[0019] In a further preferred embodiment, one or both protruding regions are continuous when viewed in a section perpendicular to the axial direction and are in particular formed as a crescent-shaped protrusion, which facilitates fine precision in the production of the saddle.

[0020] Furthermore, it is advantageously provided that, viewed in axial section, one or both protruding areas form a step, in particular substantially rectangular, in the upward direction and / or a reflected step in the downward direction. This ensures low transverse forces while maintaining the desired axial locking which is easier to overcome when the assembled state is produced.

[0021] In a preferred embodiment, the wall of the saddle has a retaining bearing on its inner surface, in particular a thread, for connecting an elongated instrument for releasing the fastening element by axially retaining the saddle in the receiving position when a portion of the fastening element is received in the receptacle of the saddle.

[0022] Regarding the seat of the saddle, it is preferably arranged as a seat for accommodating the head of the pedicle screw, in particular by elastic clamping, and in particular engaging the seat in the area exceeding the maximum head diameter. This ensures simplified handling when the coupling between the screw and the connecting device is not yet rigid.

[0023] Another component of the connection device may preferably be an integral locking screw having a thread designed to match the thread of the side wall.

[0024] In addition, the present invention also claims protection for an implant group, which has at least one connecting rod, in particular a connecting rod with a circular cross-section; at least two pedicle screws; and at least two implants in an assembled state according to one of the aforementioned aspects, the heads of the pedicle screws can be inserted into the tulip-shaped cup through the opening at the end of the lower area of ​​the tulip-shaped cup and can be received by the receptacle of the saddle.

[0025] Such an implant set may also include an instrument having threads that mate with threads of the wall of the saddle for holding the saddle in a receiving position relative to the tulip-shaped cup. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Further features, details and advantages of the present invention will become apparent from the following description of the invention with reference to the accompanying drawings, in which:

[0027] Figure 1 shows the saddle inside the tulip cup in different views of different areas.

[0028] FIG. 2 shows a cross-sectional view of the lower region of the device of FIG. 1 with fixed pedicle screws,

[0029] Figure 3 A diagram showing the shape of the protruding area of ​​the saddle in an azimuthal plane,

[0030] Figure 4 shows the cutout in the threaded section,

[0031] FIG5 shows an intermediate stage of axial assembly in perspective, front view and axial section, and

[0032] FIG. 6 shows a different configuration of the protruding area than that shown in FIG. 3 . DETAILED DESCRIPTION

[0033] Figure 1 The basic structural diagram of a part of the connection device to be implanted is a combination of a tulip-shaped cup 1 and a saddle 2 arranged in the tulip-shaped cup 1. Figure 1 In the illustration, the right-hand half of the picture shows a front view, while the left-hand half of the picture is further divided into a vertical section view, the right-hand area to the left of the axial axis X of the connecting device, and a sectional view on the far left of the figure.

[0034] With respect to the axial axis X, the tulip-shaped cup 1 forms a sleeve-shaped portion with an upper end 11 and a lower end 12. Starting from the upper end 11, U-shaped recesses in the portion of the sleeve wall facing the observer and in the portion facing away from the observer form a channel, the path direction Y of which is perpendicular to Figure 1 From the paper. Figure 1 and Figure 5 It can be clearly seen that the side walls 18L, 18R arranged transversely on both sides of the U-shaped recess (when viewed transversely to the path direction Y of the channel) comprise the groove area 14 of the axial guide. Figure 1 1 ) can be placed through this passage, the connecting rod being connected in a manner known to a person skilled in the art to a plurality of connecting devices of the type shown, which in turn are coupled to pedicle screws (also not shown in FIG. 1 ). The connecting rod can be inserted laterally (in the Y direction) as well as from above in the axial direction X. The connecting rod is fixed to the connecting device by means of a clamping screw (not shown), for example a grub screw, which is screwed into an internal thread 13 formed in the upper region of the tulip-shaped cup 1 .

[0035] In its upper region, the saddle 2 also has a U-shaped recess forming a channel. Figure 1 The position shown, and intended to be used, is parallel to the channel of the tulip-shaped cup 1.

[0036] In the ready assembly position, such as Figure 1 As shown, the saddle 2 can be axially moved in the tulip cup 1 by means of an axial guide. To this end, due to the U-shaped opening of the tulip cup 1, a groove 14 is formed in the side walls 18L, 18R, held in the upper region, approximately halfway up the tulip cup 1, which groove 14 is limited in the axial direction downwards by a shoulder 15 and in the axial direction upwards by a shoulder 16. A projection 24 is guided in the groove 14, which projection 24 is arranged in the upper region of the saddle 2, on the outer surface of the saddle upper wall 28L when viewed radially. It can be seen that the saddle 2 is moved axially from its position relative to the tulip cup 1. Figure 1Starting from the position of the tulip cup 1 shown, it is possible to move axially upwards relative to said tulip cup 1 until the upper end 26 of the projection 24 abuts the shoulder 16. In this way, an axial lock is provided which prevents further movement of the saddle 2 in the direction of its upper end 11 in the tulip cup 1. The same axial guide is located on the right-hand side of the second wall 18R.

[0037] In its lower region, the saddle 2 is formed in the shape of a cup-shaped receptacle having retaining portions 22 separated from one another by a gap 21. The cup-shaped receptacle can accommodate the head 32 ( Figure 2 ). For example, if the pedicle screw 3 has already been screwed into the vertebra, the tulip-shaped cup 1 with the saddle 2 can be pushed onto the screw head 32. In this process, the saddle 2 is first moved upward in the tulip-shaped cup 1. As soon as the saddle 2 having the largest radial dimension in the lower region reaches the region of the tulip-shaped cup 1 having an inner curvature with a larger inner diameter than the lower end 12 (indicated by the dashed line ZM), the retaining portion 22 is elastically bent radially outwards, receives the screw head 32 in the manner of a clip, and, with the screw head 32 received, can engage the latter outside the region of the maximum diameter of the screw head.

[0038] In this position, known to a person skilled in the art, the orientation of the screw axis relative to the axial axis X can be rotated by a certain angle in each spatial direction at any rate starting from a parallel position (multiaxial coupling before rigid fixation between pedicle screw 3 and connection device).

[0039] According to a mechanism also known in the art, the ultimately desired rigid coupling between the connection device consisting of tulip cup 1 and saddle 2 and pedicle screw 3 is achieved by the fact that, due to the conical narrowing of the opening of tulip cup 1 in the lower region towards the lower end 12, the clamping screw screwed into the thread 13 presses the saddle 2 downwards in the tulip cup 1 via the connecting rod until the retaining portion 22 is pushed radially inwards and the screw is held more and more firmly until a rigid connection (conical clamping) is obtained, which is achieved by tightening the screw (not shown) into the thread 13. It should be understood that when the screw is only slightly tightened and not yet completely tightened, a situation is achieved that is advantageous to the implanting surgeon, namely that the surgeon can still modify the relative position between screw and tulip cup 1 by targeted application of force, and no unintentional changes in position can occur.

[0040] As can be better seen in the upper left view in column a) of FIG. 5 , the groove 14 is also limited in the azimuthal direction (rotational direction in the YZ plane) and does not open toward the U-shaped opening between the side walls 18L and 18R. Figure 5 c and Figure 1As shown, the protruding area 24 of the saddle 2 is received in the groove 14 in the corresponding side wall 18L, 18R. Thus, the rotation lock formed prevents the saddle 2 in the tulip-shaped cup 1 from rotating about the axial axis X as the axis. Figure 1 On the contrary, starting from a position rotated 90° about axis X relative to the position shown in FIG1, the saddle 2 cannot be brought to Figure 1 The position shown, because the rotation lock works in both directions relative to the azimuthal direction. Therefore, the saddle 2 cannot be inserted into the tulip cup 1 by a rotational movement as in the prior art. Instead, it is done from above along the axial axis X, as shown in FIG. 5 a.

[0041] The production of this operating state as shown in Figure 1, i.e. the assembly of the components saddle 2 and tulip cup 1, is carried out entirely on an axial path, as shown in Figure 5. Figure 5 shows three types of views, from top to bottom, perspective, front and cross-sectional views of an intermediate stage of this assembly process. Figure 5 The left-hand illustration of a) shows how the saddle 2 is arranged coaxially above the tulip cup 1 with respect to the common axial axis X, wherein the aligned passages are formed by the corresponding U-shaped openings. Starting from this position, the saddle 2 is inserted axially into the tulip cup 1 through the opening on the upper surface 11 of the tulip cup 1, initially in a manner substantially free of force and deformation, until the saddle 2 is reached. Figure 5 b) is shown in the middle column. To this end, in the exemplary embodiment shown, a cutout 13A is provided in the thread rib of the thread 13. Furthermore, in this exemplary embodiment, the radial dimension relationship enables the protrusion 24 to at least partially utilize the space formed by the cutout 13A during axial insertion. In other words, without the cutout 13A, axial insertion would be more difficult. The cutout 13A is provided in the thread rib of the thread 13. Figure 4 A cross section taken at the level of the thread ribs of the thread 13 is shown in detail in FIG.

[0042] from Figure 5 b), further insertion with minimal force is no longer possible due to the above-mentioned axial locks 16, 26. However, by inserting and then proceeding with force, the walls 18L, 18R are pushed radially inwards under the effect of elasticity until the resistance is overcome and the projection 24 can enter the groove 14 at the level of the shoulders 26, 18R under the elastic recovery of the wall 18L, then reaching the assembly position shown in FIG. 5 c), which corresponds essentially to FIG. 1.

[0043] In this exemplary embodiment ( Figure 3), the azimuth range of the protrusions 24L, 24R is about 50°. Regardless of the exact shape of the protrusion 24, in particular in the central region in its end regions, it is preferred that the azimuth end regions of the protruding regions have an azimuth distance within the above-mentioned range in order to achieve as stable a guidance of the axial guide as possible. For this purpose, the protruding regions can also be moved more to the azimuth end regions in terms of material accumulation, for example as Figure 6 As shown, the weights at the end regions 24'a, b, c, d are greater than at the center region 24'm.

[0044] As can be seen from the axial section in the enlarged bottom view of FIG. 5 b), the lower surface 27 of the projection 24 and the upward surface 17 of the shoulder 16 are not designed to be orthogonal to the axial direction X, but are designed to be conical, so that the axial locking can be overcome more easily when the assembly state is produced. From the axial section, the projection 24 can therefore have a stepped shape in its basic shape, the upper surface 26 having a step of approximately 90° and gradually inclined (having a reflection angle) relative to the lower surface 27.

[0045] When viewed in cross section, the crescent-shaped structure of the protruding area ( Figure 3 ) is preferred. Other configurations are conceivable (e.g. Figure 6 ), which, as already explained above, provides compliance with a minimum azimuth distance.

[0046] It is clear from the above that the invention is not limited to the embodiments described with reference to the drawings. On the contrary, the various features of the description as well as those of the appended claims are essential for realizing the invention in its various embodiments.

Claims

1. An implant in the form of a multi-part connection device for connecting a fastening element in the form of a pedicle screw to a connection element, comprising: a first part in the form of a saddle (2) having a receptacle configured to retain the head of a pedicle screw by resilient clamping, and a second part in the form of a tulip-shaped cup (1) having a receptacle for a connecting element in an axially upper region and a receptacle surrounding the saddle (2) in an axially lower region, wherein the tulip-shaped cup (1) has two azimuthally spaced side walls (18L, 18R) in the upper region, between which the receptacle for the connecting element is arranged; wherein, in an assembled state in which the saddle (2) has been installed in the tulip-shaped cup (1) in a predetermined direction, the saddle (2) is able to move axially (X) in the tulip-shaped cup (1), so that when moving in the direction of the upper region, the saddle is able to receive the head of the pedicle screw in the receiving position, and so that when moving in the direction of the lower region, the saddle is no longer able to release the head of the received pedicle screw in the retaining position, wherein the receptacle for the pedicle screw head is for a polyaxial connection, and wherein the pedicle screw can be inserted into the lower opening of the tulip-shaped cup; wherein the two axial guides for axial movement respectively comprise a protruding area (24) located on the outer surface of the saddle (2) when viewed radially, the protruding area (24) engaging in a recessed area (14) which, when viewed radially, is on the inner surface of the tulip-shaped cup (1), wherein the saddle (2) has two walls on the side facing away from its receptacle, the two walls being arranged in a predetermined direction corresponding to the side walls (18L, 18R) and each wall carrying a protruding area of ​​a respective axial guide, wherein the azimuth interval of the end areas of the protruding areas (24) is at least 18° when viewed azimuthally; and an axial lock which prevents the protruding area (24) from axially exiting the recessed area (14) in the direction of the upper area, and a rotation lock, which prevents the protruding area (24) from rotationally entering the groove area (14) and prevents the protruding area (24) from rotating away from the groove area (14) in the assembled state, wherein the tulip cup and the saddle are configured to produce their assembled state when the saddle is inserted from above due to the tulip cup when viewed in the axial direction of the axial guide, and the wall of the saddle (2) has an elastic resilience against radially inward bending, which enables the saddle (2) to axially enter the tulip cup (1) in the assembled state by overcoming the axial lock, and wherein the tulip cup and the saddle are configured so that after the axial entry from above and the protrusion into the groove area, the axial lock is overcome, and the pedicle screw is inserted through the lower opening of the tulip cup, and the receptacle of the saddle can receive the head of the pedicle screw through the elastic clamping.

2. The implant according to claim 1, characterized in that The implant is a spinal implant.

3. The implant according to claim 1, characterized in that The connecting element is a connecting rod of a spinal support.

4. The implant according to claim 1, characterized in that The azimuthal angle spacing of the end regions of the protruding region (24) is at least 24°.

5. The implant according to claim 1, characterized in that There are two axial guides arranged at 180° relative to each other.

6. The implant according to claim 1 or 2, characterized in that A thread (13) for screwing a locking screw is provided on the inner surface of the side wall (18L, 18R) to apply an axial force on the saddle (2).

7. The implant according to claim 6, characterized in that An axial force is exerted on the saddle (2) via the connecting element.

8. The implant according to claim 6, characterized in that The threads (13) on one or both side walls have cutouts (13A) to facilitate the axial entry of the saddle (2) into the tulip cup (1).

9. The implant according to claim 4, characterized in that The azimuth spacing is at least 30°.

10. The implant according to claim 9, characterized in that The azimuth angle interval is at least 36°.

11. The implant according to claim 9, characterized in that The azimuth angle interval is at least 42°.

12. The implant according to claim 1, characterized in that When viewed in a cross section orthogonal to the axial direction, the recessed region has a shape complementary to that of the projecting region.

13. The implant according to claim 12, characterized in that One protruding region or both protruding regions are continuous when viewed in a cross section perpendicular to the axial direction.

14. The implant according to claim 13, characterized in that One protruding region or both protruding regions are formed as a crescent-shaped protrusion when viewed in a cross section perpendicular to the axial direction.

15. The implant according to claim 13, characterized in that When viewed in axial cross section, one or both protruding regions form a substantially rectangular step in an upward direction and / or a reflective step in a downward direction.

16. The implant according to claim 1, characterized in that The wall of the saddle (2) has threads on its inner surface for connecting an elongated instrument for releasing the pedicle screw by axially holding the saddle (2) in a receiving position when the head of the pedicle screw is received in the receptacle of the saddle (2).

17. The implant according to claim 1, characterized in that The receptacle of the saddle (2) is a retaining portion (22) that engages an area exceeding the maximum head diameter.

18. The implant according to claim 6, characterized in that There is a locking screw having threads designed to match the threads (13) of the side wall.

19. The implant according to claim 9, characterized in that There is a locking screw having threads designed to match the threads (13) of the side wall.

20. The implant according to claim 12, characterized in that There is a locking screw having threads designed to match the threads (13) of the side wall.

21. The implant according to claim 16, characterized in that There is a locking screw having threads designed to match the threads (13) of the side wall.

22. The implant according to claim 17, characterized in that There is a locking screw having threads designed to match the threads (13) of the side wall.

23. An implant set comprising at least one connecting rod, at least two pedicle screws and at least two implants according to any one of claims 1 to 22 in an assembled state, characterized in that: The head of the pedicle screw can be inserted into the tulip-shaped cup (1) through the opening of the lower end (12) of the lower region of the tulip-shaped cup (1) and can be received by the receptacle of the saddle (2).

24. The implant set according to claim 23, characterized in that The connecting rod is a connecting rod with a circular cross section.

25. The implant set according to claim 23, characterized in that A device having a thread matching the thread of the wall of the saddle (2) is used to hold the saddle (2) in a receiving position relative to the tulip cup (1).

Images