Bone fixation plate

Abstract

The present invention provides an osteosynthesis plate for fixing bone fragments in the repair of bone, particularly the mandible. [Solution] The invention comprises a plate body P, the plate body having an upper surface OS and a lower surface for positioning the plate body on bone fragments K1 and K2, the plate body having a plurality of fixing parts BA1 and BA2, the bone fixation plate OP being fixed to the bone fragments at the lower surface of the plurality of fixing parts, each of the plurality of fixing parts being associated with at least one fixing point BP1 and BP2, at least one fixing point of the fixing parts being formed on an island part IA, the island part being connected to the relevant fixing part of the plate body only via spring segments FS1 and FS2 that allow elastically restorable relative displacement between each fixing part and each island part, and the spring segments asymmetrically surrounding the fixing point associated with the spring segments.

Description

Technical Field

[0001] The present invention relates to an osteosynthesis plate provided for fixing bone fragments for the repair of bone, particularly the mandible, comprising a plate body having an upper surface and a lower surface on which the plate body is disposed on the bone fragment. The plate body has at least one bridge portion for bridging the associated gap extending between the bone fragments, and the plate body comprises fixing portions located on both sides of at least one bridge portion. The osteosynthesis plate is to be fixed to the bone fragment by the fixing portions on its lower surface. For this purpose, at least one fixing point is associated with each fixing portion, and at least one fixing point of at least one of the fixing portions is formed in each respective island portion. The island portion is connected to the respective associated fixing portion only via a spring segment, and the spring segment allows an elastically recoverable relative displacement between the respective fixing portion and the respective island portion.

Background Art

[0002] In osteosynthesis, two or more bone fragments are connected to each other within the framework of a surgical procedure in order for the bone fragments to grow together and thus achieve bone repair. The purpose of osteosynthesis is to stabilize the bone fragments relative to each other, and this stabilization is carried out in the correct position and thus optionally while correcting displacement. In addition to fixation using wires or screws, osteosynthesis plates are also used depending on the application area, and each osteosynthesis plate is disposed on each bone in the area of each gap between the bone fragments and fixed to each of the bone fragments so as to be connected to each other.

[0003] In addition to stabilizing the bone fragments after a fracture, the osteosynthesis plate is also partially used when bone segments removed elsewhere are used in existing bone defects and stabilized for bone repair. Such defects can occur, for example, because it is necessary to remove a part of the bone after a tumor disease.

[0004] Regarding the bone healing process, it has been found that it is preferable for the bone fragments to be repaired not to be rigidly connected to each other via a bone fixation plate, but rather for micro-movements of the bone fragments relative to each other to be permitted. To enable these micro-movements, the fixation point is connected to at least one of the bone fragments to be joined via a spring segment.

[0005] International Publication No. 2011 / 163387 describes a plate for fixing fractures, having an outer surface and a bone-facing surface. The bone plate has slots extending through the plate from the outer surface to the bone-facing surface. The slots at least partially circumscribe one or more of the accommodation holes and do not extend through the longitudinal edges of the bone plate. The slots form a spring element, which at least partially surrounds the accommodation holes and allows axial displacement of the bone plate with respect to one or more accommodation holes in a plane parallel to the upper or lower surface of the bone plate, but prevents movement of the bone plate with respect to one or more accommodation holes in a direction perpendicular to the upper surface of the bone plate. [Overview of the project]

[0006] Moving forward from the prior art described above, the problem addressed by the present invention is to provide a bone fixation plate that can provide an arrangement of fixation points that is as variable as possible, where the fixation points are relatively displaceable via spring segments.

[0007] This objective is achieved based on the preamble of claim 1 in combination with its characteristic features. Each subsequent dependent claim reflects a preferred evolution of the invention. Further preferred embodiments can be gathered from the specification and drawings.

[0008] According to the present invention, a bone fixation plate provided for fixing bone fragments for bone repair includes a plate body having an upper surface and a lower surface on which the plate body is positioned on the bone fragment. The plate body has a plurality of fixation parts, and the bone fixation plate is fixed to the bone fragment at the lower surface of the plurality of fixation parts, and each of the plurality of fixation parts is associated with at least one fixation point for this purpose. At least one fixation point of at least one of the fixation parts is formed in an island portion connected to the associated fixation part of the plate body only via a spring segment, the spring segment allowing an elastically restorable relative displacement between each fixation part and each island portion.

[0009] The bone fixation plate according to the present invention is provided for fixing bone fragments for bone repair. This bone repair can exist within the framework of the present invention such that bone fragments formed by a bone fracture are fixed to each other via the bone fixation plate according to the present invention. Thus, in this case, the bone fragments related to the bone being repaired are fixed and stabilized to each other via the bone fixation plate. However, bone repair can also be considered, within the scope of the meaning of the present invention, to mean that a bone defect is closed by a bone segment excised from another bone for this purpose. Thus, in this case, the bone is repaired from its own bone fragments and bone fragments related to another bone. The bone fixation plate according to the present invention is then used to fix the excised bone segment in this case, closing the defect with at least one of the bone segments located on both sides. Most preferably, the bone fixation plate is provided for use in the region of the mandible (mandible) and can achieve repair either within the framework of a fracture or within the framework of closing a bone defect.

[0010] The bone fixation plate preferably comprises an elongated plate body, that is, a plate body that extends at least primarily in the longitudinal direction. The plate body can extend along this longitudinal axis or can be designed to extend along this longitudinal oriented trajectory.

[0011] The plate body has, in particular, an upper surface and a lower surface facing opposite directions on the plate body. When the bone fixation plate according to the present invention is used, the plate body is positioned on the bone fragments on the lower surface of the plate body, and during this positioning, at least one gap is bridged, and this gap extends between the bone fragments to be fixed. Furthermore, when the bone fixation plate is used, fixation to the bone fragments to be fixed is carried out on the lower surface of the plate body, and for this purpose, the plate body of the bone fixation plate is provided with a plurality of fixation parts. Each fixation part is associated with at least one fixation point, each fixation point is preferably formed by a through hole through which a bone screw can be guided. Fixation to each bone fragment is carried out by a bone screw.

[0012] In at least one of the fixing portions of the plate body, at least one provided fixing point is formed on an island portion, and the island portion is exclusively connected to the associated fixing portion only via a spring segment, and the spring segment connects each island portion to the associated fixing portion. These spring segments allow for an elastically restorable relative displacement of the island portion with respect to the associated fixing portion, which, within the scope of the present invention, means in particular that when a load is applied, the spring segment elastically deforms during the relative displacement that the island portion and the associated fixing portion experience with respect to each other, and returns to its original shape when the load is removed, returning to its initial position. Preferably, the spring segment is designed as a spring leg that extends at least largely in a straight line.

[0013] Preferably, the spring segment allows relative displacement between the island portion and the fixed portion substantially parallel to the upper and lower surfaces, and / or only in the longitudinal direction. This is because the gaps between the bone fragments are also bridged in this direction due to the course of the plate body, and relative displacement in this direction results in a change in the gap size, which has been found to be favorable with respect to the healing process of the bone being repaired.

[0014] Particularly preferably, each island portion protrudes from the lower surface of the plate body relative to the associated fixation portion, so that when the bone fixation plate is fixed to each bone fragment, each island portion rests on the bone fragment, and at the same time, an open space exists between the bone fragment and the associated fixation portion. As a result, since the fixation portion is also placed on a bone fragment that is displaced relative to the fixation portion, it can be ensured that the relative displacement between the island portion and the fixation portion is not hindered by friction.

[0015] The bone fixation plate is preferably manufactured by an additive manufacturing process, preferably by a 3D printing process. The bone fixation plate is preferably made of titanium, titanium alloy, stainless steel, or a suitable polymer, such as polyetheretherketone (PEEK).

[0016] The present invention includes a technical teaching that a spring segment asymmetrically surrounds an associated fixed point.

[0017] Such embodiments of the bone fixation plate have the advantage that a compact embodiment of the island portion of the associated fixation is possible due to the asymmetric path of the spring segments. On the associated fixation, in the island portion located at one end of the plate body, the spring segments located at this end can be configured differently from the spring segments on the opposite side so that the island portion can be positioned as close as possible to the end of the plate body. If the fixation is provided with multiple fixation points formed in the island portion, the asymmetric path of each spring segment allows for a higher density arrangement of the island portion. Thus, the design according to the present invention allows for greater variation in the arrangement of fixation points so that the arrangement can be adapted to the anatomical structure in the best possible way.

[0018] According to one possible embodiment of the present invention, the island portion is connected to its respective fixing portion via exactly two spring segments. Thus, in this case, exactly two spring segments connect each island portion to its associated fixing portion. Within the framework of the present invention, three or more spring segments may also be provided to connect each island portion to its associated fixing portion.

[0019] According to a further possible embodiment of the present invention, the island portion and associated spring segment are formed by through-openings formed in their respective fixing portions. Preferably, this allows for an integral design of the plate body by defining the island portion and spring segment by introducing through-openings into the plate body at their respective fixing portions. If the plate body of the bone fixation plate is manufactured by an additive manufacturing process, the through-openings may also be formed by this additive manufacturing process. However, alternatively, the through-openings may also be defined by grinding or material removal.

[0020] The through-openings can be U-shaped, and these U-shaped through-openings are nested within each other with their openings facing one another. As a result, each island section and associated spring segment can be designed to be particularly space-saving, further improving the variability of the fixed point arrangement.

[0021] In a further possible embodiment of the present invention, the first spring segment of the spring segment is oriented perpendicular to the longitudinal direction of the fixing portion. Due to this path of the spring segment, the associated island portion can be positioned close to one end of the associated fixing portion or adjacent to further island portions of the associated fixing portion.

[0022] According to a further possible embodiment of the present invention, each fixing portion has a plurality of associated fixing points, each of which is formed in an island portion having spring segments arranged asymmetrically around the respective fixing point. As a result, the plurality of fixing points of this fixing portion can be arranged compactly with respect to each other, and the variability of the arrangement of the fixing points is further improved.

[0023] Preferably, the second spring segment of the spring segment is oriented to extend at an acute angle with respect to the direction perpendicular to the longitudinal direction of the fixed portion. As a result, a relative displacement of the island portion with respect to the associated fixed portion can be obtained, and thus, changes in the gap between the bone fragments are obtained through this acutely oriented spring segment when a lateral load is applied to the fixed portion or when a laterally extending load is introduced to the fixed point.

[0024] In the combination of the two modified forms described above, the multiple fixing points formed on the island can be formed continuously in the longitudinal direction of each fixing part, and adjacent island parts are designed identically to each other and arranged point-symmetrically so that the spring segments extending at acute angles face each other. Preferably, this allows for the formation of continuous island parts adjacent to each other in a very compact manner.

[0025] In a further possible embodiment of the present invention, the fixation portions are positioned in pairs on either side of each intermediate bridge portion provided to bridge the gap extending between bone fragments. In this possible embodiment, at least one of the asymmetrically arranged spring segments can be oriented such that a relative displacement occurs between each island portion and each fixation portion when a load is applied in the principal loading direction of the bone, and during the relative displacement, the distance between each island portion and the bridge portion increases. This has the advantage that when a load is applied to the bone in the principal loading direction, the gap bridged by the bridge portion between the bone segments also expands due to the increase in the distance between the island portion and the bridge portion. This prevents the gap between bone segments from becoming zero and colliding with each other, otherwise the healing process of the bone being repaired would be complicated. When the excised bone segments are inserted into the bone defect to be repaired, if the excised bone segments are configured as a transition fit for the defect, it can also be prevented that the gap between bone segments is too small or nonexistent.

[0026] Within the scope of the present invention, “a load is applied in the principal loading direction” of the bone is understood to mean, in particular, the action of forces on the bone when a load is applied to the bone in the usual manner. Preferably, this load is applied such that the resulting lateral force is induced at the relevant fixation point of the island portion. In the case of a preferred embodiment of an osteosynthesis plate for fixing bone fragments for mandibular restoration, the load in the principal loading direction is, in particular, the occlusal force to be supported via the mandible.

[0027] According to a further possible embodiment of the present invention, at least one fixing point of one of the fixing parts is fixed in place. In this fixing part, one or more fixing points are fixed in place, and a firm connection to each bone segment can be established.

[0028] Alternatively or additionally, the fixing points of the plurality of fixing portions are formed in the island portion. If a design that fixes the position of at least one fixing point is not implemented in any of the fixing portions, the fixing points of all the fixing portions are formed in the island portion.

[0029] Preferred embodiments of the present invention described below are shown in the drawings.

Brief Description of the Drawings

[0030] [Figure 1A] It is a schematic view of a bone with a bone fixation plate fixed according to an embodiment of the present invention. [Figure 1B] It is a schematic view of a bone with a bone fixation plate fixed according to an embodiment of the present invention, shown in a state different from FIG. 1A. [Figure 2] It is a perspective view of each bone fixation plate according to each further embodiment of the present invention. [Figure 3] It is a perspective view of each bone fixation plate according to each further embodiment of the present invention. [Figure 4] It is a perspective view of each bone fixation plate according to each further embodiment of the present invention.

Mode for Carrying Out the Invention

[0031] FIGS. 1A and 1B show schematic views of a bone K with a bone fixation plate OP fixed, where the bone K is preferably the mandible. The bone fixation plate OP should be fixed to the bone fragments K1 and K2 in order to stabilize the bone fragments K1 and K2 relative to each other, thereby enabling the bone fragments K1 and K2 to grow together for the repair of the bone K.

[0032] In this case, bone fragments K1 and K2 may be formed as a result of a fracture of bone K, and the bone fixation plate OP is provided to heal this fracture by stabilizing bone fragments K1 and K2 relative to each other. Alternatively, one of bone fragments K1 and K2 may be used to close a defect in bone K, for example, because a portion of bone K had to be removed at this site due to a tumorous disease. Bone fragment K1 or K2 is a section of bone resected from another bone, for example, the fibula.

[0033] The bone fixation plate OP is preferably made of titanium or a titanium alloy and has an elongated plate body P manufactured in particular by an additive manufacturing process, preferably a 3D printing process. The plate body P has an upper surface OS, which can be seen in Figures 1A and 1B, and a lower surface, which is not visible and is located on the opposite side of the upper surface, on which the plate body P is placed on bone fragments K1 and K2.

[0034] The plate body P consists of two fixing parts BA1 and BA2, and a bridge part BU located between fixing parts BA1 and BA2. The plate body P is fixed to the bone fragment K1 at fixing part BA1 on the lower surface of the plate body P, and this fixation is performed at fixing point BP1 associated with fixing part BA1. Fixing point BP1 is designed as a through hole DO1, each of which extends between the upper surface OS and the lower surface and is used to guide the respective bone screws (not shown). The through holes DO1 are introduced into fixing part BA1 and fixed in place on fixing part BA1.

[0035] Adjacent to the fixation portion BA1, the plate body P has a bridge portion BU for bridging a gap S. The gap S is located between bone fragments K1 and K2. Adjacent to the bridge portion BU is a fixation portion BA2 to which the plate body P is fixed to bone fragment K2. For this purpose, the fixation portion BA2 has a fixation point BP2 associated with the fixation portion BA2. The fixation point BP2 is also designed as a through hole DO2 that extends between the upper surface OS and the lower surface and is used to guide the respective bone screws (not shown).

[0036] In contrast to the fixed part BA1, the through-hole DO2 of the fixed part BA2 is introduced into or defined into the island part IA, and the island part IA is separated from the fixed part BA2 by connecting each individual island part IA to the fixed part BA2 only via spring segments FS1 and FS2. The associated spring segments FS1 and FS2 allow for an elastically restorable relative displacement of each island part IA with respect to the fixed part BA2, and therefore further, of the associated fixed point BP2.

[0037] The spring segments FS1 and FS2, and their respective associated island portions IA, are defined on the bone fixation plate OP via through-openings D1 and D2 of the plate body P, the through-openings D1 and D2 being U-shaped and extending from the upper surface OS to the lower surface. The through-openings D1 and D2 are nested within each other with their U-shaped openings facing each other, thereby defining the spring segments FS1 and FS2 in addition to separating each island portion IA from the fixing portion BA2. Specifically, the U-shapes of the through-openings D1 and D2 are offset from each other in that both U-shapes have first legs S11 and S12 extending laterally relative to the respective base sides GS1 and GS2 of the U-shapes, however, in the U-shape of through-opening D1, the second leg S21 extends outward at an angle relative to the base side GS1, and in the U-shape of through-opening D2, the second leg S22 extends inward at an angle. This results in linear and asymmetrical paths for spring segments FS1 and FS2 relative to their respective fixed points BP2. Due to these asymmetrical paths, the island portions IA' provided on the fixed portion BA2 can be positioned close together and separated in the same direction.

[0038] Figure 1A shows bone K in an unloaded state, where spring segments FS1 and FS2 of each island IA set the initial position of each island IA, thereby resulting in a gap size SM1 between bone fragments K1 and K2. In contrast, Figure 1B shows bone K under load B, which is indicated by an arrow in Figure 1B and represents a typical load on bone K. In the case of a preferred embodiment of bone K as the mandible, this load B may be the occlusal force to be supported.

[0039] Each island IA's spring segment FS2 extends at an acute angle with respect to its respective force vector KV, thereby representing the lateral force generated at each fixed point BP2 due to load B, as indicated by the arrow in Figure 1B for one of the fixed points BP2. With respect to force vector KV, in addition to this acute-angled path shown by the dashed line in Figure 1B, the spring segment FS2 of island IA also branches out toward bridge BU. As a result, when load B is introduced to bone segment K2, the force in the spring segment FS2 deflects, causing island IA to move away from bridge BU, thus increasing the distance between island IA and bridge BU. This causes bone segments K1 and K2 to move away from each other, and thus the gap S increases to gap size SM2. When load B is no longer applied, the gap S decreases again to gap size SM1, and the spring segments FS1 and FS2 of each island IA induce the corresponding return displacement by elastically returning to their original shapes. Generally, the healing process of bone K is facilitated by the relative movement of bone fragments K1 and K2 relative to each other.

[0040] The gap sizes SM1 and SM2 in Figures 1A and 1B, as well as the deflection of island IA in Figure 1B, are greatly exaggerated for better illustration. In actual applications of bone fusion plates OP and OP', smaller gap sizes are naturally used, and a typical load B on bone K results in a smaller deflection of island IA than shown in Figure 1B.

[0041] Figure 2 shows a perspective view of a bone fixation plate OP' according to a further possible embodiment of the present invention. The difference from the modified forms shown in Figures 1A and 1B is that the plate body P' of this bone fixation plate OP' has two bridge portions BU1 and BU2 for bridging the respective gaps (not shown in Figure 2). Thus, three bone fragments can be stabilized relative to each other using the bone fixation plate OP' for bone repair. The bridge portions BU1 and BU2 are defined as interposed between fixation portions BA1', BA2', and BA3', each used to fix one of the bone fragments.

[0042] The fixed point BP1' is fixed to a fixed position on the fixed part BA1', while the fixed points BP2' and BP3' of the fixed parts BA2' and BA3' are defined on their respective island parts IA', which are designed similarly to the modified forms shown in Figures 1A and 1B. In the fixed part BA3', the island parts IA are oriented in the same direction such that the spring segment FS1 of the island part IA located at one end E of the plate body P' faces this end E. As a result, this last island part IA can be located close to the end E. For the remainder, please refer to the description of the possible embodiments shown in Figure 2, which correspond to the modified forms shown in Figures 1A and 1B.

[0043] Figure 3 shows a perspective view of a bone fixation plate OP'' according to a further possible embodiment of the present invention. This largely corresponds to the modified form shown in Figure 2, but in contrast to the bone fixation plate OP'' in Figure 2, the island portions IA of both the fixing portion BA2' and fixing portion BA3' are oriented in opposite directions, and the spring segments FS2 face each other in the island portions IA which are oriented in opposite directions. This allows for a more compact configuration of the island portions IA adjacent to each fixing portion BA2' and BA3' than in the modified form shown in Figure 2. For the remainder, the possible embodiment shown in Figure 3 corresponds to the modified form shown in Figure 2, so please refer to its description.

[0044] Furthermore, Figure 4 shows a perspective view of the bone fixation plate OP'''', which is designed in accordance with a further embodiment of the present invention and substantially corresponds to the modified form shown in Figure 3. The difference is that the plate body P of this bone fixation plate OP'''' has only one bridge portion BU and two fixing portions BA1 and BA2 located on either side thereof. The fixing point BP1 on fixing portion BA1 is fixed in a fixed position, while the fixing point BP2 associated with fixing portion BA2 is formed on the island portion IA. In accordance with the modified form shown in Figure 3, these island portions IA are oriented in opposite directions in such that the spring segments FS2 of these island portions IA face each other. For the remainder, please refer to the description of the embodiment shown in Figure 4, as it corresponds to the modified form shown in Figure 3.

[0045] Embodiments of the present invention provide bone fixation plates that allow for a compact arrangement of fixation points, and the fixation points are relatively displaceable via spring segments. [Explanation of Symbols]

[0046] K...bone, OP, OP', OP'', OP'''...bone fixation plate, K1, K2...bone fragment, P, P'...plate body, OS...top surface, BA1, BA2, BA1', BA2', BA3'...fixation part, BU, BU1, BU2...bridge part, BP1, BP2, BP1', BP2', BP3'...fixation point, DO1, DO2...through hole, S...gap, IA...island part, FS1, FS2...spring segment, D1, D2...through opening, GS1, GS2...base side, S11, S12, S21, S22...leg part, SM1, SM2...gap size, B...load, KV...force vector, E...end.

Claims

1. A bone fixation plate (OP, OP', OP'', OP'''') provided for fixing bone fragments (K1, K2) for the repair of bone (K), particularly the mandible, comprising a plate body (P, P') having an upper surface (OS) and a lower surface for positioning the plate body (P, P') on the bone fragments (K1, K2), wherein the plate body (P, P') comprises a plurality of fixing parts (BA1, The bone fixation plates (OP, OP', OP'', OP''') are fixed to the bone fragments (K1, K2) on the lower surfaces of the plurality of fixation parts (BA1, BA2, BA1', BA2', BA3'), and each of the plurality of fixation parts (BA1, BA2, BA1', BA2', BA3') has at least one fixation point (BP1, BP2, BP1', BP2', BP3') A bone fixation plate (OP, OP', OP'', OP'') is characterized in that a fixation portion (BA1, BA2, BA1', BA2', BA3') is associated with an island portion (IA), at least one of the fixation portions (BA1, BA2, BA1', BA2', BA3') has a fixation point (BP2, BP2', BP3') formed on an island portion (IA), the island portion (IA) is connected to the associated fixation portion (BA2, BA2', BA3') of the plate body (P, P') only via spring segments (FS1, FS2) that allow elastically restorable relative displacement between each of the fixation portions (BA2, BA2', BA3') and each of the island portion (IA), and the spring segments (FS1, FS2) asymmetrically surround the fixation point (BP2, BP2', BP3') associated with the spring segments.

2. The bone fixation plate (OP, OP', OP'', OP''') according to claim 1, characterized in that the island portion (IA) is connected to the respective fixing portions (BA2, BA2', BA3') via two spring segments (FS1, FS2).

3. The bone fixation plate (OP, OP', OP'', OP''') according to claim 1 or 2, characterized in that the island portion (IA) and the associated spring segments (FS1, FS2) are formed by through openings (D1, D2) formed in the respective fixing portions (BA2, BA2', BA3').

4. The bone joint plate (OP, OP', OP'', OP''') according to claim 3, characterized in that the through-openings (D1, D2) are U-shaped, and the U-shaped through-openings (D1, D2) are nested inside each other with their openings facing each other.

5. The bone fixation plate (OP, OP', OP'', OP''') according to any one of claims 1 to 4, characterized in that the first spring segment among the spring segments (FS1, FS2) is oriented perpendicular to the longitudinal direction of the fixing portion (BA2, BA2', BA3').

6. The bone fixation plate (OP, OP', OP'', OP'''') according to any one of claims 1 to 5, characterized in that each of the aforementioned fixing portions (BA2, BA2', BA3') is associated with a plurality of fixing points (BP2, BP2', BP3'), and each of the fixing points (BP2, BP2', BP3') is formed in an island portion (IA) having spring segments (FS1, FS2) arranged asymmetrically around each of the aforementioned fixing points (BP2, BP2', BP3').

7. The bone fixation plate (OP, OP', OP'', OP''') according to any one of claims 1 to 6, characterized in that the second spring segment of the spring segments (FS1, FS2) extends at an acute angle with respect to the direction perpendicular to the longitudinal direction of the fixing portion (BA2, BA2', BA3').

8. The bone fixation plates (OP'', OP'''') according to claims 6 and 7, characterized in that the plurality of fixing points (BP2, BP2', BP3') formed on the island portion (IA) are formed continuously in the longitudinal direction of each of the fixing portions (BA2, BA2', BA3'), and adjacent island portions (IA) are identically designed to face each other and arranged point-symmetrically, such that the spring segments (FS2) extending at acute angles face each other.

9. The bone fixation plate (OP, OP', OP'', OP''') according to any one of claims 1 to 8, characterized in that the fixing portions (BA1, BA2, BA1', BA2', BA3') are arranged in pairs on both sides of each intermediate bridge portion (BU, BU1, BU2) provided to bridge the gap (S) extending between the bone fragments (K1, K2).

10. The bone joint plate (OP, OP') according to claim 9, characterized in that at least one of the asymmetrically arranged spring segments (FS1, FS2) is oriented such that when a load (B) is applied in the principal loading direction of the bone (K), a relative displacement occurs between each of the island portions (IA) and each of the fixing portions (BA2, BA2'), and during the relative displacement, the distance between each of the island portions (IA) and the bridge portions (BU, BU1) increases.

11. The bone fixation plate (OP, OP', OP'', OP''') according to any one of claims 1 to 10, characterized in that one of the fixing parts (BA1, BA2, BA1', BA2', BA3') has at least one fixing point (BP1, BP1') fixed in a fixed position.

12. The bone fixation plate (OP', OP'') according to any one of claims 1 to 11, characterized in that the fixation points (BP2', BP3') of a plurality of or all of the fixation portions (BA2', BA3') are formed on the island portion (IA).

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