Axial micro-motion locking bone fracture plate

Abstract

The invention relates to the technical field of medical instruments, and provides an axial micro-motion locking bone fracture plate which comprises a body divided into a first fixing part and a second fixing part in the length direction of the body. The first fixing part is matched with the near end of a fracture, and the second fixing part is matched with the far end of the fracture; the sliding hole is formed in the second fixing part; the sliding block is arranged in the sliding hole in a sliding manner; and the first locking screw is used for connecting the sliding block with the bone. According to the axial micro-motion locking bone fracture plate, under the action of muscle contraction, the sliding block slides in the sliding hole in the first direction, so that the fracture far end is allowed to move in the direction close to the fracture near end; when the muscle stops contracting, under the action of gravity, the sliding block slides in the sliding hole in the second direction opposite to the first direction, so that the fracture far end is allowed to move in the direction away from the fracture near end. In this way, continuous stress stimulation can be formed on the fracture broken end, and fracture healing can be promoted.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to an axial micro-motion locking bone plate. Background Art

[0002] Studies have shown that micro-motion stimulation of the fracture ends can promote osteoblast activity, osteogenic growth factor release, collagen production and bone salt deposition, thereby accelerating the speed of fracture healing and enhancing the strength of fracture healing. In the prior art, locking plates are widely used in limb fractures. The locking design can effectively avoid the compression of the periosteum tissue by the plate and ensure the blood supply of the fracture ends. However, the existing locking plates will cause micro-motion of the fracture ends to be limited due to their strong internal fixation system. Once the fracture ends lack stress stimulation, the corresponding callus will not be formed, and the osteoblasts and osteoclasts at the fracture ends can only be relied on to reconstruct the bone unit, which affects the healing speed of the fracture. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is that the locking steel plate in the prior art will lead to limited micro-motion of the fracture ends due to its strong internal fixation system. Once the fracture ends lack stress stimulation, the corresponding callus cannot be formed, and the bone units can only be reconstructed by osteoblasts and osteoclasts at the fracture ends, which affects the healing speed of the fracture, thereby providing an axial micro-motion locking bone plate.

[0004] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0005] The present invention provides an axial micro-motion locking bone plate, comprising: a body, which is divided into a first fixing part and a second fixing part along the length direction of the body; the first fixing part is adapted to be set at the proximal end of the fracture, and the second fixing part is adapted to be set at the distal end of the fracture; a sliding hole is arranged in the second fixing part; a slider is slidably arranged in the sliding hole; a first locking screw is used to connect the slider to the bone; wherein, under the action of muscle contraction, the slider slides in the sliding hole along a first direction to allow the distal end of the fracture to move toward a direction close to the proximal end of the fracture; when the muscle stops contracting, the slider slides in the sliding hole along a second direction opposite to the first direction to allow the distal end of the fracture to move toward a direction away from the proximal end of the fracture.

[0006] Furthermore, a guide rail is provided on the inner wall of the sliding hole along the sliding direction of the slider; a sliding groove adapted to the guide rail is provided on the side wall of the slider, and when the slider is embedded in the sliding hole, the sliding groove is inserted into the guide rail.

[0007] Furthermore, the sliding block can slide in the sliding hole within a displacement range of 0.5 mm to 0.7 mm.

[0008] Furthermore, the sliding block can slide in the sliding hole for a displacement of 0.6 mm.

[0009] Furthermore, the thickness of the slider is smaller than the thickness of the body, so that the slider will not bulge out relative to the body when it is disposed in the sliding hole.

[0010] Furthermore, the axial micro-motion locking bone plate also includes a locking hole and a second locking screw; the locking hole is arranged in the first fixing part, and the first fixing part is fixed to the proximal end of the fracture through the locking hole and the second locking screw.

[0011] Furthermore, a plurality of the locking holes are arranged at intervals along the length direction of the first fixing portion; and a plurality of the sliding holes are arranged at intervals along the length direction of the second fixing portion.

[0012] Furthermore, the axial micro-motion locking bone plate also includes a pressure hole, which is arranged on the second fixing part and is used to lift and reposition the distal end of the fracture through the pressure hole.

[0013] Furthermore, the pressurizing hole is located between the first two sliding holes close to the fracture gap.

[0014] Furthermore, the number of the locking holes is the same as the sum of the number of the sliding holes and the pressurizing holes.

[0015] The technical solution of the present invention has the following advantages:

[0016] The axial micro-motion locking bone plate provided by the present invention, when in use, the first fixing part can be fixed to the proximal end of the fracture, the second fixing part can be fixed to the distal end of the fracture, and the second fixing part is provided with a sliding hole, and a slider is slidably provided in the sliding hole, and the slider is connected to the bone by a first locking screw. When in use, under the action of muscle contraction, the slider slides in the sliding hole along a first direction to allow the distal end of the fracture to move toward the direction close to the proximal end of the fracture; when the muscle stops contracting, under the action of gravity, the slider slides in the sliding hole along a second direction opposite to the first direction to allow the distal end of the fracture to move toward the direction away from the proximal end of the fracture. In such a reciprocating cycle, continuous stress stimulation can be formed on the fracture ends, which is conducive to promoting fracture healing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a schematic diagram of an axial micro-motion locking bone plate in an embodiment of the present invention;

[0019] Figure 2 It is a schematic diagram of the partial structure of the axial micro-motion locking bone plate in an embodiment of the present invention;

[0020] Figure 3 Schematic diagram of a slider in an axial micro-motion locking bone plate in an embodiment of the present invention;

[0021] Figure 4 for Figure 3 A cross-sectional view of

[0022] Figure 5 is a schematic diagram of a first locking screw in an axial micro-motion locking bone plate in an embodiment of the present invention;

[0023] Figure 6 It is a schematic diagram of the axial micro-motion locking bone plate in the embodiment of the present invention in use.

[0024] Description of reference numerals:

[0025] 1. Main body; 2. First fixing part; 3. Second fixing part; 4. Sliding hole; 5. Sliding block; 6. First locking screw; 7. Locking hole; 8. Second locking screw; 9. Pressurization hole; 10. Guide rail; 11. Slide groove; 12. Proximal end of fracture; 13. Distal end of fracture; 14. Fracture gap. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] like Figure 1 , Figure 5 as well as Figure 6 As shown, this embodiment provides an axial micro-motion locking bone plate, including: a main body 1, for example, the main body 1 can be a steel plate, and from a functional point of view, the main body 1 can be divided into a first fixing part 2 and a second fixing part 3 along its own length direction; the first fixing part 2 is adapted to be set at the proximal end 12 of the fracture, and the second fixing part 3 is adapted to be set at the distal end 13 of the fracture; a sliding hole 4 is arranged in the second fixing part 3; a slider 5 is slidably arranged in the sliding hole 4; a first locking screw 6 is used to connect the slider 5 to the bone; wherein, under the action of muscle contraction, the slider 5 slides in the sliding hole 4 along a first direction to allow the distal end 13 of the fracture to move toward a direction close to the proximal end 12 of the fracture; when the muscle stops contracting, the slider 5 slides in the sliding hole 4 along a second direction opposite to the first direction to allow the distal end 13 of the fracture to move toward a direction away from the proximal end 12 of the fracture.

[0031] The axial micro-motion locking bone plate provided in this embodiment, when in use, the first fixing part 2 can be fixed to the proximal end 12 of the fracture, the second fixing part 3 can be fixed to the distal end 13 of the fracture, and the second fixing part 3 is provided with a sliding hole 4, and a slider 5 is slidably provided in the sliding hole 4, and the slider 5 is connected to the bone by a first locking screw 6. When in use, under the action of muscle contraction, the slider 5 slides in the sliding hole 4 along a first direction to allow the distal end 13 of the fracture to move toward the direction close to the proximal end 12 of the fracture; when the muscle stops contracting, under the action of gravity, the slider 5 slides in the sliding hole 4 along a second direction opposite to the first direction to allow the distal end 13 of the fracture to move toward the direction away from the proximal end 12 of the fracture. In such a reciprocating cycle, continuous stress stimulation can be formed on the fracture ends, which is conducive to promoting fracture healing.

[0032] like Figure 2 , Figure 3 as well as Figure 4As shown, a guide rail 10 is provided on the inner wall of the sliding hole 4 along the sliding direction of the slider 5; a slide groove 11 adapted to the guide rail 10 is provided on the side wall of the slider 5, and when the slider 5 is inserted into the sliding hole 4, the slide groove 11 is inserted into the guide rail 10. For example, the sliding hole 4 can be a rectangular hole, and a guide rail 10 can be provided on each of the inner walls on the left and right sides of the sliding hole 4. For example, the slider 5 can be a square-shaped slider 5, and a groove is provided on each of the left and right sides of the slider 5 to serve as the slide groove 11. When the slider 5 is inserted into the guide rail 10 through the slide groove 11, the slider 5 can slide up and down. At the same time, due to the restrictions of the guide rail 10 and the slide groove 11, the slider 5 can also be prevented from falling off from the sliding hole 4.

[0033] Among them, the sliding block 5 and the sliding hole 4 can be produced in an integrated manner during the product manufacturing process, thereby avoiding secondary assembly during surgery.

[0034] The sliding displacement range of the slider 5 in the sliding hole 4 is 0.5 mm to 0.7 mm. That is, along the sliding direction of the slider 5, the size of the sliding hole 4 can be slightly larger than the slider 5, so that the slider 5 can move slightly in the sliding hole. Preferably, the sliding displacement of the slider 5 in the sliding hole 4 is 0.6 mm.

[0035] The thickness of the slider 5 can be smaller than that of the body 1, so that the slider 5 does not protrude relative to the body 1 when it is set in the sliding hole 4. This arrangement can prevent the slider 5 from protruding out of the sliding hole 4 during the micro-movement process, thereby avoiding interference with muscle tissue, blood vessels, etc.

[0036] Among them, for the slider 5, a threaded hole can be set on its surface parallel to the body 1. When in use, the first locking screw 6 is connected to the slider 5 through the threaded hole, and the first locking screw 6 can enter the bone after passing through the threaded hole, and finally the entire second fixing part 3 and the bone are fixed to each other. In addition, the slider 5 can also be prevented from moving along the axial direction parallel to the first locking screw 6.

[0037] The axial micro-motion locking bone fracture plate further includes a locking hole 7 and a second locking screw 8; the locking hole 7 is provided in the first fixing part 2, and the first fixing part 2 is fixed to the fracture proximal end 12 through the locking hole 7 and the second locking screw 8. For example, the locking hole 7 is a locking hole with an internal thread, and the second locking screw 8 is connected to the first fixing part 2 through the locking hole 7. At the same time, the second locking screw 8 passes through the locking hole 7 and enters the bone, and finally the first fixing part 2 and the bone are fixed to each other.

[0038] Among them, a plurality of locking holes 7 are arranged at intervals along the length direction of the first fixing portion 2; a plurality of sliding holes 4 are arranged at intervals along the length direction of the second fixing portion 3, and correspondingly, a slider 5 can be arranged in each sliding hole 4. For example, four locking holes 7 can be arranged at intervals along the length direction of the first fixing portion 2. For example, three sliding holes 4 can be arranged at intervals along the length direction of the second fixing portion 3.

[0039] The axial micro-motion locking bone plate further includes a pressurizing hole 9, which is disposed in the second fixing portion 3. Only one pressurizing hole 9 may be provided, and is used to lift and reset the fracture distal end 13 through the pressurizing hole 9. For example, the pressurizing hole 9 is located between the first two sliding holes 4 near the fracture gap 14.

[0040] The number of the locking holes 7 is equal to the sum of the number of the sliding holes 4 and the pressurizing holes 9 .

[0041] In summary, the axial micro-motion locking bone plate in the present application does not require the surgeon to perform secondary assembly of the steel plate and the slider 5 during the operation. The first locking screw 6 can be directly implanted through the threaded hole of the slider 5 to complete the internal fixation of the steel plate, thereby reducing the number of surgical steps and effectively shortening the operation time.

[0042] The axial micro-motion locking bone plate in the present application can ensure that the slider 5 slides in the sliding hole 4 along the length direction of the main body 1, restricting the movement of the slider 5 in other directions and only providing axial micro-motion for the fracture end.

[0043] In the axial micro-motion locking bone plate of the present application, the length of the sliding hole 4 is 0.6 mm greater than the length of the sliding block 5, which allows the sliding block 5 to micro-move 0.6 mm in the sliding hole 4, providing only 0.6 mm axial micro-motion at the bone fracture end.

[0044] The axial micro-motion locking bone plate in the present application, under the joint action of the locking hole 7, the sliding hole 4 and the pressurizing hole 9, can provide axial sliding for the fracture ends without affecting the lifting and reduction of the fracture ends.

[0045] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. An axial micro-motion locking bone plate, characterized in that: include: The body (1) is divided into a first fixing portion (2) and a second fixing portion (3) along the length direction of the body (1); the first fixing portion (2) is adapted to be arranged at the proximal end (12) of the fracture, and the second fixing portion (3) is adapted to be arranged at the distal end (13) of the fracture; A sliding hole (4) is provided on the second fixing portion (3); A slider (5) slidably disposed in the sliding hole (4); A first locking screw (6) for connecting the slider (5) to the bone; Wherein, under the action of muscle contraction, the slider (5) slides in the sliding hole (4) along a first direction to allow the fracture distal end (13) to move toward a direction close to the fracture proximal end (12); When the muscle stops contracting, the slider (5) slides in the sliding hole (4) along a second direction opposite to the first direction, so as to allow the fracture distal end (13) to move in a direction away from the fracture proximal end (12).

2. The axial micro-motion locking bone plate according to claim 1, characterized in that: A guide rail (10) is provided on the inner wall of the sliding hole (4) along the sliding direction of the sliding block (5); A sliding groove (11) adapted to the guide rail (10) is arranged on the side wall of the sliding block (5); when the sliding block (5) is embedded in the sliding hole (4), the sliding groove (11) is inserted into the guide rail (10).

3. The axial micro-motion locking bone plate according to claim 1, characterized in that: The sliding block (5) can slide in the sliding hole (4) within a displacement range of 0.5 mm to 0.7 mm.

4. The axial micro-motion locking bone plate according to claim 3, characterized in that: The sliding block (5) can slide in the sliding hole (4) with a displacement of 0.6 mm.

5. The axial micro-motion locking bone plate according to claim 1, characterized in that: The thickness of the slider (5) is smaller than the thickness of the body (1), so that the slider (5) will not protrude relative to the body (1) when it is arranged in the sliding hole (4).

6. The axial micro-motion locking bone plate according to claim 1, characterized in that: It also includes a locking hole (7) and a second locking screw (8); The locking hole (7) is arranged on the first fixing part (2), and the first fixing part (2) is fixed to the proximal end (12) of the fracture through the locking hole (7) and the second locking screw (8).

7. The axial micro-motion locking bone plate according to claim 6, characterized in that: A plurality of locking holes (7) are arranged at intervals along the length direction of the first fixing portion (2); A plurality of sliding holes (4) are arranged at intervals along the length direction of the second fixing portion (3).

8. The axial micro-motion locking bone plate according to claim 7, characterized in that: It also comprises a pressure hole (9) which is arranged on the second fixing part (3) and is used for lifting and resetting the fractured distal end (13) through the pressure hole (9).

9. The axial micro-motion locking bone plate according to claim 8, characterized in that: The pressurizing hole (9) is located between the first two sliding holes (4) close to the fracture gap (14).

10. The axial micro-motion locking bone plate according to claim 8, characterized in that: The number of the locking holes (7) is the same as the sum of the number of the sliding holes (4) and the pressurizing holes (9).

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