Bone fracture plate with angle stable lag screw structure

Abstract

According to the bone fracture plate with the angle stabilizing lag screw structure, the plurality of threaded holes are formed in the bone fracture plate body, the angle stabilizing accessories are connected into the threaded holes in a threaded mode, then the lag screws are inserted into and penetrate through the sleeve holes of the angle stabilizing accessories, and the angle stabilizing accessories can be fixed. And then the bone fracture plate body is fixed on broken bones on two sides of a fracture line through lag screws. In the process that the lag screw pulls broken bones on the two sides of a fracture line to reset and align, due to the fact that the outer peripheral face of the cylindrical nail rod part is in sliding contact with the inner side face of the sleeve hole, and the angle stabilizing accessory provides support for the cylindrical nail rod part, load transmission generated by external force can be eliminated through the angle stabilizing accessory when the external force generates load transmission, and the fracture line is prevented from being damaged. Therefore, displacement of the lag screw is effectively avoided, and reduction loss after fracture alignment caused by displacement of the lag screw is prevented. In addition, due to the fact that the angle stabilizing accessories can disperse stress of the lag screws located on the two sides of the fracture line, fatigue fracture of the bone fracture plate body caused by stress concentration of the lag screws located on the two sides of the fracture line is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular, relates to a bone fracture plate with an angle-stable lag screw structure. Background Art

[0002] Minimally invasive plate osteosynthesis is a modern fracture fixation technology that uses closed fracture reduction technology and non-pressure plate fixation to maintain fracture alignment, minimizing surgical exposure and soft tissue stripping, reducing blood supply damage to tissues such as the skin, periosteum, and fracture fragments, and can improve fracture healing rates and reduce the incidence of complications such as infection or nonunion.

[0003] At present, ordinary bone plates usually use spherical screws to fix the bone plates on the broken bones on both sides of the fracture line. As the spherical surface of the screws presses against the spherical surface of the steel plate slot and is continuously screwed in, the bone surface screws are pulled toward the bone plate to generate huge pressure to complete basic fixation. However, this fixation method lacks stable angular stability because the contact surface between the steel plate and the screw is a spherical contact. If there is an external force to generate load transmission, the screws will be displaced, resulting in the loss of reduction of the fracture line. Summary of the invention

[0004] Based on the above-mentioned problems existing in the prior art, the purpose of an embodiment of the present invention is to provide a bone plate with an angularly stable tension screw structure to solve the problem that the ordinary spherical screws of the bone plate in the prior art have poor angular stability and are prone to displacement, resulting in loss of reduction after fracture alignment.

[0005] To achieve the above object, the technical solution adopted by the present invention is to provide a bone plate with an angularly stable lag screw structure, comprising:

[0006] The bone plate body is provided with a plurality of threaded holes;

[0007] An angular stabilizing accessory, used to be installed in the threaded hole, wherein the outer peripheral surface of the angular stabilizing accessory is provided with a first external thread that matches the thread of the threaded hole, and the angular stabilizing accessory is provided with a sleeve hole along its axial direction; and

[0008] A lag screw is used to fix the bone plate body to the broken bones on both sides of the fracture line, the lag screw comprises a cylindrical nail shaft portion for being inserted into the sleeve hole, a first nail body portion connected to the head end of the cylindrical nail shaft portion, and a nail tail cap connected to the tail end of the cylindrical nail shaft portion, and a second external thread is provided on the outer peripheral surface of the first nail body portion;

[0009] Wherein, after the cylindrical nail rod portion is inserted into the sleeve hole of the angle stabilizing accessory, the outer peripheral surface of the cylindrical nail rod portion is in sliding contact with the inner side surface of the sleeve hole.

[0010] Furthermore, the angle stabilization accessory includes an externally threaded angle stabilization ring for providing radial support to the cylindrical nail rod portion and an annular angle stabilization ring for providing axial support to the cylindrical nail rod portion. The annular angle stabilization ring is integrally formed with the externally threaded angle stabilization ring, the sleeve hole is arranged to penetrate along the axial direction of the externally threaded angle stabilization ring, and the first external thread is arranged on the outer peripheral surface of the externally threaded angle stabilization ring.

[0011] Furthermore, the outer diameter of the annular angle stabilizing ring is greater than the outer diameter of the external thread angle stabilizing ring, so as to form a stepped surface at the connection between the annular angle stabilizing ring and the external thread angle stabilizing ring for abutting against a side of the bone plate body away from the broken bone.

[0012] Furthermore, the inner diameter of the annular angle stabilizing ring is larger than the aperture of the sleeve hole, so that a stepped hole groove for accommodating and supporting the nail tail cap brim is formed at the connection between the annular angle stabilizing ring and the external thread angle stabilizing ring.

[0013] Furthermore, a hole groove structure is recessed on the annular corner stabilizing ring for facilitating the disassembly of the annular corner stabilizing ring.

[0014] Furthermore, the bone plate with an angularly stable tension screw structure also includes locking screws for locking the plate body to the broken bones on both sides of the fracture line, the angularly stable accessories are screwed into the corresponding threaded holes on the plate body close to both sides of the fracture line, the tension screws are inserted into the sleeve holes of each of the angularly stable accessories, and the locking screws are screwed into the corresponding threaded holes on the plate body away from the fracture line.

[0015] Furthermore, the locking screw includes a columnar nail tail portion for being inserted into the threaded hole and a second nail body portion connected to the columnar nail tail portion, the outer peripheral surface of the columnar nail tail portion is provided with a third external thread that cooperates with the thread of the threaded hole, and the outer peripheral surface of the second nail body portion is provided with a fourth external thread.

[0016] Furthermore, a micro-motion clearance between an outer peripheral surface of the cylindrical nail rod portion and an inner side surface of the sleeve hole is 0.01 to 0.06 mm.

[0017] Furthermore, the outer peripheral surface roughness of the cylindrical nail rod portion is Ra≤3.2, and the inner surface roughness of the sleeve hole is Ra≤3.2.

[0018] Furthermore, along the direction from the side of the bone fracture plate body away from the broken bone to the side of the bone fracture plate body facing the broken bone, the inner diameter of the threaded hole gradually decreases, and the outer diameter of the angle stabilizing accessory gradually decreases.

[0019] Compared with the prior art, the one or more technical solutions in the embodiments of the present invention have at least one of the following beneficial effects:

[0020] The bone plate with an angularly stable tension screw structure in the embodiment of the present invention has a plurality of threaded holes arranged on the bone plate body. It is only necessary to thread the angularly stable fittings into the threaded holes, insert the tension screws into and pass through the sleeve holes on the angularly stable fittings, and then fix the bone plate body to the broken bones on both sides of the fracture line through the tension screws. In the process of the tension screws pulling the broken bones on both sides of the fracture line to reposition, since the outer peripheral surface of the cylindrical nail rod part is in sliding contact with the inner surface of the sleeve hole, and the angularly stable fittings provide elastic support force for the cylindrical nail rod part, when there is an external force to generate load transmission, the elastic force of the angularly stable fittings can be eliminated, thereby effectively avoiding displacement of the tension screws, and further preventing the displacement of the tension screws and causing loss of reposition after fracture alignment. In addition, since the angularly stable fittings can disperse the stress of the tension screws on both sides of the fracture line, it is avoided that the stress concentration of the tension screws on both sides of the fracture line causes fatigue fracture of the metal bone plate body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 A schematic diagram of the three-dimensional structure of a bone plate with an angularly stable lag screw structure provided by an embodiment of the present invention;

[0023] Figure 2 for Figure 1 A schematic diagram of a top view of a bone plate with an angle-stable lag screw structure as shown in FIG.

[0024] Figure 3 for Figure 2 A schematic cross-sectional view of a bone plate with an angle-stable lag screw structure along line AA as shown in FIG.

[0025] Figure 4 for Figure 2 A schematic cross-sectional view of the bone plate with an angle-stable lag screw structure along line BB as shown in FIG.

[0026] Figure 5 A schematic diagram of the three-dimensional structure of a bone fracture plate body provided by an embodiment of the present invention;

[0027] Figure 6 A schematic diagram of the three-dimensional structure of an angle stabilizing accessory provided by an embodiment of the present invention;

[0028] Figure 7 Another schematic diagram of the three-dimensional structure of the corner stabilizing accessory provided by an embodiment of the present invention;

[0029] Figure 8 for Figure 1 An exploded view of a bone plate with an angularly stable lag screw structure as shown in;

[0030] Fig. 9 A schematic structural diagram of a bone fracture plate with an angularly stable lag screw structure provided by another embodiment of the present invention;

[0031] Fig.10 A schematic diagram of the three-dimensional structure of a locking screw provided in another embodiment of the present invention;

[0032] Fig.11 A schematic structural diagram of a bone fracture plate with an angularly stable lag screw structure provided by another embodiment of the present invention;

[0033] Fig.12 An exploded view of a bone plate with an angularly stable lag screw structure provided by another embodiment of the present invention.

[0034] Among them, the reference numerals in the figure are:

[0035] 1-bone plate body; 11-threaded hole;

[0036] 2-angle stabilizing accessory; 21-external thread angle stabilizing ring; 211-first external thread; 212-throwing hole; 22-annular angle stabilizing ring; 23-step surface; 24-step hole groove; 25-hole groove structure;

[0037] 3-tension screw; 31-cylindrical nail rod; 32-first nail body; 321-second external thread; 33-nail tail cap;

[0038] 4-locking screw; 41-columnar nail tail; 411-third external thread; 42-second nail body; 421-fourth external thread;

[0039] 5-Fracture line. DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0041] It should be noted that when an element is referred to as "connected to" or "set on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly specified and specifically defined. In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0042] Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, not all references are to the same embodiment. Furthermore, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0043] Please also read Figures 1 to 8 The bone plate with an angle-stable lag screw structure provided by the embodiment of the present invention is now described. Figure 1 , Figure 5 and Figure 8 The bone plate with an angular stabilization lag screw structure provided by the embodiment of the present invention comprises a bone plate body 1, an angular stabilization accessory 2 and a lag screw 3. The bone plate body 1 is provided with a plurality of threaded holes 11, and the plurality of threaded holes 11 are arranged at intervals. It should be noted that the bone plate body 1 can be but is not limited to a T-shaped plate, and the number of the angular stabilization accessory 2 and the lag screw 3 is consistent with the number of the threaded holes 11 on the bone plate body 1. Please refer to Figure 2 , Figure 3 and Figure 4The angular stabilizing fitting 2 is used to be installed in the threaded hole 11. The outer surface of the angular stabilizing fitting 2 is provided with a first external thread 211 that is threadedly matched with the threaded hole 11. The angular stabilizing fitting 2 is provided with a sleeve hole 212 along its axial direction. The sleeve hole 212 is a cylindrical through hole with a smooth hole wall. The tension screw 3 is used to fix the bone plate body 1 to the broken bones on both sides of the fracture line 5 and provide tension for the reduction and alignment of the broken bones. Please refer to Figure 1 , Figure 3 and Figure 4 The tension screw 3 includes a cylindrical nail rod portion 31 for inserting into the sleeve hole 212, a first nail body portion 32 connected to the head end of the cylindrical nail rod portion 31, and a nail tail cap 33 connected to the tail end of the cylindrical nail rod portion 31, and a second external thread 321 is provided on the outer circumference of the first nail body portion 32. Among them, the angle stabilization accessory 2 and the tension screw 3 are made of the same material, for example, the angle stabilization accessory 2 and the tension screw 3 are both made of medical stainless steel. The angle stabilization accessory 2 and the tension screw 3 are made of different materials, for example, the angle stabilization accessory 2 can be made of an elastomer made of a material with shape memory, and the elastomer can be but is not limited to a shape memory alloy such as titanium alloy with shape memory, and the tension screw 3 is made of medical stainless steel. In addition, after the cylindrical nail rod portion 31 is inserted into the sleeve hole 212 of the angle stabilization accessory 2, the outer circumference of the cylindrical nail rod portion 31 is in sliding contact with the inner side surface of the sleeve hole 212.

[0044] Compared with the prior art, the bone plate with an angular stabilization lag screw structure provided by the embodiment of the present invention has a plurality of threaded holes 11 arranged on the bone plate body 1, and it is only necessary to thread the angular stabilization fittings 2 into the threaded holes 11, and then insert the lag screws 3 into and pass through the sleeve holes 212 on the angular stabilization fittings 2, and then fix the bone plate body 1 to the broken bones on both sides of the fracture line 5 through the lag screws 3. In the process of the lag screws 3 pulling the broken bones on both sides of the fracture line 5 to reposition, since the outer peripheral surface of the cylindrical nail rod portion 31 is in sliding contact with the inner surface of the sleeve holes 212, and the angular stabilization fittings 2 provide elastic supporting force for the cylindrical nail rod portion 31, when there is external force generating load transmission, the load can be eliminated by the elastic force of the angular stabilization fittings 2, thereby effectively avoiding displacement of the lag screws 3, and further preventing the displacement of the lag screws 3 and causing the loss of reposition after fracture alignment. In addition, since the angular stabilizing accessory 2 can disperse the stress of the tension screws 3 located on both sides of the fracture line 5, it is avoided that the stress concentration of the tension screws 3 located on both sides of the fracture line 5 causes fatigue fracture of the metal bone plate body 1.

[0045] Please refer to Figure 3 , Figure 6 and Figure 7In some embodiments, the angular stabilizing accessory 2 may be an elastic body made of a material with shape memory, and the angular stabilizing accessory 2 includes an externally threaded angular stabilizing ring 21 for providing radial elastic force to the cylindrical nail rod portion 31 and an annular angular stabilizing ring 22 for providing axial elastic force to the cylindrical nail rod portion 31. The annular angular stabilizing ring 22 is integrally formed with the externally threaded angular stabilizing ring 21, and a sleeve hole 212 is provided along the axial direction of the externally threaded angular stabilizing ring 21. The first external thread 211 is provided on the outer peripheral surface of the externally threaded angular stabilizing ring 21. The externally threaded angular stabilizing ring 21 is threadedly connected to the threaded hole 11 on the bone plate body 1. The externally threaded angular stabilizing ring 21 can provide radial elastic force to the cylindrical nail rod portion 31 by sliding the cylindrical nail rod portion 31 of the tension screw 3 into the sleeve hole 212 of the externally threaded angular stabilizing ring 21. The annular angular stabilizing ring 22 is supported on the side of the bone plate body 1 away from the broken bone, and the tail nail tail cap 33 of the lag screw 3 is supported on the annular angular stabilizing ring 22, so that the annular angular stabilizing ring 22 can provide axial elastic force to the cylindrical nail rod 31. It should be noted that along the direction from the side of the bone plate body 1 away from the broken bone to the side of the bone plate body 1 facing the broken bone, the inner diameter of the threaded hole 11 gradually decreases, and the outer diameter of the external threaded angular stabilizing ring 21 gradually decreases.

[0046] Please refer to Figure 4 , Figure 6 and Figure 7 In some embodiments, the outer diameter of the annular angle stabilization ring 22 is larger than the outer diameter of the external thread angle stabilization ring 21, so as to form a step surface 23 at the connection between the annular angle stabilization ring 22 and the external thread angle stabilization ring 21 for abutting against the side of the plate body 1 away from the broken bone, thereby enhancing the stability of the connection between the angle stabilization accessory 2 and the plate body 1, thereby facilitating improving the angular stability of the tension screw 3 and overcoming the stress concentration problem of the tension screws 3 located on both sides of the fracture line 5.

[0047] Please refer to Figure 2 , Figure 3 and Figure 7 In some embodiments, the inner diameter of the annular angle stabilizing ring 22 is larger than the aperture of the sleeve hole 212, so that a stepped hole groove 24 for accommodating and resisting the nail tail cap brim 33 is formed at the connection between the annular angle stabilizing ring 22 and the external thread angle stabilizing ring 21. On the one hand, it can prevent the tension screw 3 and the external thread angle stabilizing ring 21 of the angle stabilizing accessory 2 from loosening or shifting, thereby facilitating improving the angular stability of the tension screw 3; on the other hand, it can prevent the stress concentration of the tension screw 3 on both sides of the fracture line 5 from causing fatigue fracture of the bone plate body 1. It should be noted that the bone plate body 1 can be made of, but not limited to, alloy materials that meet medical standards such as stainless steel or titanium alloy.

[0048] Please refer to Figure 1 , Figure 2 and Figure 7 In some of the embodiments, a hole structure 25 is recessed on the annular angle stabilizing ring 22 for facilitating the removal of the annular angle stabilizing ring 22, thereby facilitating the removal and installation of the angle stabilizing accessory 2 and the bone plate body 1.

[0049] Please refer to Fig. 9 , Fig.10 , Fig.11 and Fig.12 In some embodiments, the angular stabilization accessory 2 can be an elastomer made of a shape memory material. The bone plate with an angular stabilization tension screw structure also includes a locking screw 4 for locking the plate body 1 on the broken bones on both sides of the fracture line 5. The bone plate with an angular stabilization tension screw structure also includes a locking screw 4 for locking the plate body 1 on the broken bones on both sides of the fracture line 5. The angular stabilization accessories 2 are screwed into the corresponding threaded holes 11 on the plate body 1 close to the fracture line 5 on both sides, and the tension screw 3 is inserted in the sleeve hole of each angular stabilization accessory 2. The locking screw 4 is screwed into the corresponding threaded holes 11 on the plate body 1 away from the fracture line 5, and the sum of the number of the tension screws 3 and the locking screws 4 is equal to the number of the threaded holes 11. In this embodiment, the angular stabilizing accessories 2 are screwed into the corresponding threaded holes 11 on the plate body 1 near the fracture line 5, the lag screws 3 are inserted into the sleeve holes of each angular stabilizing accessory 2, and the locking screws 4 are screwed into the corresponding threaded holes 11 on the plate body 1 away from the fracture line 5. The plate body 1 can be locked to the broken bones away from the fracture line 5 by the locking screws 4, and the plate body 1 can be fixed to the broken bones near the fracture line 5 by the lag screws 3. When there is an external force to generate load transmission, the elastic force of the angular stabilizing accessories 2 with shape memory can be eliminated, that is, due to the elastic buffering effect of the angular stabilizing accessories 2 with shape memory, the stress of the lag screws 3 near the fracture line 5 can be dispersed, and the stress concentration of the lag screws 3 near the fracture line 5 can be avoided to cause fatigue fracture of the plate body 1. It should be noted that the plate body 1 can be made of, but not limited to, alloy materials that meet medical use standards such as stainless steel or titanium alloy.

[0050] Please refer to Fig. 9 , Fig.10 and Fig.12In some embodiments, the locking screw 4 includes a columnar nail tail 41 for inserting into the threaded hole 11 and a second nail body 42 connected to the columnar nail tail 41, a third external thread 411 threadedly matched with the threaded hole 11 is provided on the outer circumference of the columnar nail tail 41, and a fourth external thread 421 is provided on the outer circumference of the second nail body 42. When it is necessary to lock the broken bones on both sides of the fracture line 5 through the bone plate body 1, it is only necessary to thread the columnar nail tail 41 of the locking screw 4 with the threaded hole 11 on the bone plate body 1 to achieve the switching between the locking mode and the above-mentioned angle stable pressurization mode. In addition, along the direction from the side of the bone plate body 1 away from the broken bone to the side of the bone plate body 1 facing the broken bone, the inner diameter of the threaded hole 11 gradually decreases, and the outer diameter of the columnar nail tail 41 gradually decreases, which can prevent the columnar nail tail 41 from coming out of the threaded hole 11 under the pulling force of the locking screw 4.

[0051] It should be noted that, in some embodiments, the micro-clearance between the outer circumferential surface of the cylindrical nail rod portion 31 and the inner surface of the sleeve hole 212 is 0.01 to 0.06 mm. When the broken bone is subjected to its own gravity and the tension of muscle tissue, the tension screw 3 will generate an active displacement of a predetermined distance in the sliding hole of the angular stabilization accessory 2 under the action of the above-mentioned force. The active displacement can drive the broken bones on both sides of the fracture line 5 to approach each other, thereby causing the distance of the broken bone gaps between the broken bones on both sides of the fracture line 5 to gradually decrease. When the above-mentioned force on the broken bone is released, since the angular stabilization accessory 2 can adopt an elastomer made of a shape memory material, the elastic action of the angular stabilization accessory 2 will prompt the tension screw 3 to be reset, that is, the tension screw 3 is reset in the sliding hole, driving the broken bones on both sides of the fracture line 5 to move away from each other, thereby causing the distance of the broken bone gaps between the broken bones on both sides of the fracture line 5 to gradually increase. Since a preset micro-motion gap of 0.01 to 0.06 mm is formed between the tension screw 3 and the sliding hole, the preset micro-motion gap between the tension screw 3 and the sliding hole is mainly an up and down displacement in the vertical direction, accompanied by a very slight left and right shear movement in the horizontal direction, so that the micro-motion amplitude of the fracture end and the stress of the micro-motion stimulation are controlled within an appropriate range that is conducive to promoting callus growth and improving the quality of callus. This is repeated many times, which can cause axial micro-motion between the broken bones, achieve repeated micro-motion stimulation of the gap between the broken bones, and promote fracture healing.

[0052] It should be noted that, in some embodiments, the roughness of the outer circumferential surface of the cylindrical nail rod portion 31 is Ra≤3.2, and the roughness of the inner surface of the sleeve hole 212 is Ra≤3.2. When a preset micro-motion gap of 0.01 to 0.06 mm is formed between the tension screw 3 and the sliding hole, it can be ensured that the preset micro-motion gap between the tension screw 3 and the sliding hole is mainly a vertical up and down displacement, accompanied by a very slight horizontal left and right shear movement, so that the micro-motion amplitude of the fracture end and the stress of the micro-motion stimulation are controlled within an appropriate range that is conducive to promoting callus growth and improving the quality of callus.

[0053] Please refer to Figure 2 and Figure 4 In some of the embodiments, the inner diameter of the threaded hole 11 gradually decreases from the side of the plate body 1 away from the broken bone to the side of the plate body 1 facing the broken bone, and the outer diameter of the angular stabilizing accessory 2 gradually decreases. On the one hand, this can prevent the angular stabilizing accessory 2 from escaping from the threaded hole 11 under the tension of the tension screw 3. On the other hand, it is beneficial to enhance the stability of the angular stabilizing accessory 2 and improve the angular stability of the tension screw 3.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bone plate with an angle-stable lag screw structure, characterized in that: include: The bone plate body is provided with a plurality of threaded holes; An angular stabilizing accessory, used to be installed in the threaded hole, wherein the outer peripheral surface of the angular stabilizing accessory is provided with a first external thread that matches the thread of the threaded hole, and the angular stabilizing accessory is provided with a sleeve hole along its axial direction; and A lag screw is used to fix the bone plate body to the broken bones on both sides of the fracture line, the lag screw comprises a cylindrical nail shaft portion for being inserted into the sleeve hole, a first nail body portion connected to the head end of the cylindrical nail shaft portion, and a nail tail cap connected to the tail end of the cylindrical nail shaft portion, and a second external thread is provided on the outer peripheral surface of the first nail body portion; Wherein, after the cylindrical nail rod portion is inserted into the sleeve hole of the angle stabilizing accessory, the outer peripheral surface of the cylindrical nail rod portion is in sliding contact with the inner side surface of the sleeve hole.

2. The bone plate with an angle-stable lag screw structure according to claim 1, characterized in that: The bone plate with an angular stabilization tension screw structure also includes locking screws for locking the plate body to the broken bones on both sides of the fracture line. The angular stabilization accessories are screwed into the corresponding threaded holes on the plate body close to the fracture line, the tension screws are inserted into the sleeve holes of each angular stabilization accessory, and the locking screws are screwed into the corresponding threaded holes on the plate body away from the fracture line.

3. The bone plate with an angle-stable lag screw structure according to claim 2, characterized in that: The locking screw includes a columnar nail tail portion for inserting into the threaded hole and a second nail body portion connected to the columnar nail tail portion, a third external thread that matches the thread of the threaded hole is provided on the outer circumference of the columnar nail tail portion, and a fourth external thread is provided on the outer circumference of the second nail body portion.

4. The bone fracture plate with an angle-stable lag screw structure according to claim 1, characterized in that: The angle stabilization accessory includes an external thread angle stabilization ring for providing radial support to the cylindrical nail rod portion and an annular angle stabilization ring for providing axial support to the cylindrical nail rod portion. The annular angle stabilization ring is integrally formed with the external thread angle stabilization ring, the sleeve hole is arranged to penetrate the axial direction of the external thread angle stabilization ring, and the first external thread is arranged on the outer peripheral surface of the external thread angle stabilization ring.

5. The bone fracture plate with an angle-stable lag screw structure according to claim 4, characterized in that: The outer diameter of the annular angle stabilizing ring is greater than the outer diameter of the external thread angle stabilizing ring, so as to form a stepped surface at the connection between the annular angle stabilizing ring and the external thread angle stabilizing ring for abutting against a side of the bone plate body away from the broken bone.

6. The bone fracture plate with an angle-stable lag screw structure according to claim 4, characterized in that: The inner diameter of the annular angle stabilizing ring is larger than the aperture of the sleeve hole, so that a stepped hole groove for accommodating and supporting the nail tail cap brim is formed at the connection between the annular angle stabilizing ring and the external thread angle stabilizing ring.

7. The bone fracture plate with an angle-stable lag screw structure according to claim 4, characterized in that: The annular angle stabilizing ring is recessed with a hole groove structure for facilitating the disassembly of the annular angle stabilizing ring.

8. The bone fracture plate with an angle-stable lag screw structure according to claim 1, characterized in that: The micro-motion clearance between the outer peripheral surface of the cylindrical nail rod portion and the inner side surface of the sleeve hole is 0.01-0.06 mm.

9. The bone fracture plate with an angle-stable lag screw structure according to claim 1, characterized in that: The outer peripheral surface roughness of the cylindrical nail rod portion Ra≤3.2, and the inner surface roughness of the sleeve hole Ra≤3.

2.

10. The bone fracture plate with an angle-stable lag screw structure according to any one of claims 1 to 9, characterized in that: Along the direction from the side of the bone fracture plate body away from the broken bone to the side of the bone fracture plate body facing the broken bone, the inner diameter of the threaded hole gradually decreases, and the outer diameter of the angle stabilizing accessory gradually decreases.

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