Variable fixing bone fracture plate

Abstract

The invention discloses a variable fixing bone fracture plate which comprises a main plate and a sliding plate, one end of the main plate is provided with a hollowed-out part, the sliding plate is arranged in the hollowed-out part, the main plate and the sliding plate are each provided with an installation part, at least one end of the sliding plate is provided with a filling area and an elastic piece, and the filling area is filled with degradable materials. And the elastic sheet can generate elastic deformation when being extruded. And when the degradable substances in the filling area are not degraded in the early stage, the elastic sheet has no space for compression deformation, so that early-stage stable fixation is realized. And after the elastic sheet is degraded, a micro-motion gap can be provided for the sliding plate, that is, the elastic sheet can generate elastic deformation towards the filling area after being extruded, and the elastic sheet can recover to the original shape by virtue of self elasticity after the pressure disappears, so that the filling area reproduces and drives the sliding plate to generate elastic micro-motion, and the requirements of different stages of fracture healing on mechanical stimulation can be met. In the fracture healing process, controlled conversion from an early-stage stable fixing mode to an elastic fixing mode can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of orthopedic medical devices, and in particular to a variable fixed bone plate. Background Art

[0002] At present, most studies generally believe that low-frequency axial movement within a distance range of 0.2 to 1 mm between the fracture ends is beneficial to fracture healing, and the initial mechanical stability of the fracture ends (especially within 4 to 8 days) is crucial to the regeneration of blood vessels and bones around them. Therefore, it is necessary to design a variable fixation plate that can be stably fixed in the early stage and then automatically converted into axial micro-motion fixation. In the prior art, there are only a few types of plates that can achieve micro-motion fixation. Most of the micro-motion plates rely on the sliding device on the plate to produce micro-motion, but they will not automatically return to their original position after sliding, which affects the next micro-motion. The plate with elastic micro-motion function has a complex overall structure and manufacturing process, and a large number of parts, resulting in high manufacturing costs, complex operation and use, and significantly reduced mechanical strength and reliability. In particular, when the elastic component breaks or loosens, it will cause foreign matter in the body, posing a safety hazard. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a variable fixed bone plate which is simple and efficient in structure, safe and reliable, easy to use, and can achieve early stable fixation and then automatically convert into axial elastic fixation.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A variable fixed bone plate comprises a main board and a slide plate, wherein one end of the main board is provided with a hollow portion, the slide plate is arranged in the hollow portion, the main board and the slide plate are both provided with mounting portions, at least one end of the slide plate is provided with a filling area and a spring sheet, the filling area is filled with a degradable substance, and when the degradable substance filled in the filling area is degraded, the spring sheet can undergo elastic deformation when squeezed.

[0006] As a further improvement of the above technical solution: the filling area includes an arc-shaped area, and the width of the arc-shaped area gradually decreases from the middle to both sides.

[0007] As a further improvement of the above technical solution: a raised portion is provided in the middle of the arc-shaped area, and the spring pieces are located on both sides of the raised portion.

[0008] As a further improvement of the above technical solution: the yield strength of the degradable material is not less than 40Mpa.

[0009] As a further improvement of the above technical solution: the degradable material is a magnesium-calcium alloy or a magnesium-zinc alloy.

[0010] As a further improvement of the above technical solution: a slide groove is provided on the side wall of the hollow portion, an extension portion is provided around the slide plate, the extension portion is embedded in the slide groove, and the filling area and the spring sheet are provided on the extension portion.

[0011] As a further improvement of the above technical solution: the corresponding parts of the slide groove and the two sides of the main board are dovetail grooves, and the corresponding parts of the slide groove and the end of the main board are rectangular grooves.

[0012] As a further improvement of the above technical solution: the mounting portion is a locking screw hole or a locking pressure hole with threads.

[0013] As a further improvement of the above technical solution: the mounting portion on the main board and the mounting portion on the slide board are symmetrically distributed.

[0014] As a further improvement of the above technical solution: thickened portions are provided at the edges of the upper and lower surfaces of the mainboard.

[0015] Compared with the prior art, the advantages of the present invention are:

[0016] The variable fixation bone plate disclosed in the present invention, when used, the degradable material in the filling area does not degrade in the early stage, and the spring piece does not undergo elastic deformation, thereby achieving early stable fixation. When the degradable material is degraded, it can provide a micro-motion gap for the slide plate, that is, when the spring piece is squeezed, it undergoes elastic deformation toward the filling area, and when the pressure disappears, the spring piece relies on its own elastic force to restore its original shape, so that the filling area reappears, driving the slide plate to produce elastic micro-motion, thereby meeting the needs of mechanical stimulation at different stages of fracture healing, and the overall structure is simple and efficient, safe and reliable, the use and operation methods are consistent with traditional bone plates, the manufacturing process is simple, and the cost is low.

[0017] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the variable fixation bone fracture plate of the present invention in use state.

[0019] Figure 2 It is a schematic diagram of the structure of the variable fixation bone fracture plate of the present invention in a top view when in use.

[0020] Figure 3 It is a schematic cross-sectional structural diagram of the variable fixation bone fracture plate of the present invention in use state.

[0021] Figure 4 It is a three-dimensional structural schematic diagram of the mainboard in the present invention.

[0022] Figure 5 It is a structural schematic diagram of the chute in the present invention.

[0023] Figure 6 It is a three-dimensional structural schematic diagram of the skateboard in the present invention.

[0024] Figure 7 It is a schematic diagram of the three-dimensional structure of the degradable material in the filling area before degradation in the present invention.

[0025] Figure 8 It is a schematic diagram of the three-dimensional structure of the degradable material in the filling area after degradation in the present invention.

[0026] The symbols in the figure represent:

[0027] 1. Main board; 11. Hollow part; 12. Slide groove; 13. Thickened part; 2. Slide plate; 21. Filling area; 22. Degradable material; 23. Shrapnel; 24. Extension part; 3. Installation part; 4. Femur; 5. Screw. DETAILED DESCRIPTION

[0028] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying 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 should not be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "assemble", "connect", "connect", "fix" and the like 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 an indirect connection 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 specific circumstances.

[0031] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Figures 1 to 8An embodiment of the variable fixation bone plate of the present invention is shown. The variable fixation bone plate of this embodiment includes a main board 1 and a slide plate 2. The left end of the main board 1 is provided with a hollow portion 11, and the slide plate 2 is provided at the hollow portion 11. A plurality of mounting portions 3 are provided on both the main board 1 and the slide plate 2. The right end of the slide plate 2 is provided with a filling area 21 and a spring piece 23, and the filling area 21 is filled with a degradable material 22. When the degradable material 22 is degraded, the filling area 21 forms a blank space. When the spring piece 23 is squeezed, elastic deformation occurs here, so that relative micro-motion occurs between the main board 1 and the slide plate 2. Among them, the early stable fixation time, that is, the in vivo degradation time of the degradable material 22 is preferably 8-30 days, and a suitable natural degradation material or responsive degradation material can be selected according to needs.

[0033] See Figure 7 and Figure 8 When the variable fixation bone plate of this embodiment is used, the degradable material 22 in the filling area 21 does not degrade in the early stage, and the spring piece 23 does not undergo elastic deformation, thereby achieving early stable fixation. When the degradable material 22 degrades, it can provide a micro-motion gap (0.2-1 mm) for the slide plate 2, that is, when the spring piece 23 is squeezed, it undergoes elastic deformation toward the filling area 21, and when the pressure disappears, the spring piece 23 restores its original shape by its own elastic force, so that the filling area 21 reappears, driving the slide plate 2 to produce elastic micro-motion, thereby meeting the needs of mechanical stimulation at different stages of fracture healing, and the overall structure is simple and efficient, highly reliable, easy to use, and low cost.

[0034] See Figure 8 In this embodiment, the filling area 21 includes an arc-shaped area, and the width of the arc-shaped area gradually decreases from the middle to both sides. After the degradable material 22 in the filling area 21 is degraded, the head end of the spring piece 23 has a larger deformation gap, and the thickness of the tail end of the spring piece 23 (the end connected to the main part of the skateboard 2) gradually increases, which is beneficial to improve the connection strength between the spring piece 23 and the main part of the skateboard 2 and prevent breakage. The structure is reasonable and effective.

[0035] Furthermore, in this embodiment, a convex portion is provided in the middle of the arc-shaped area, and the spring pieces 23 are located on both sides of the convex portion, that is, the convex portion divides the spring piece 23 into two parts, and accordingly, the filling area 21 is Y-shaped as a whole, and the head ends of the spring pieces 23 on both sides can be close to each other after being compressed, and the structure has good symmetry. Preferably, the spring pieces 23 just close the arc-shaped area after being compressed.

[0036] As a preferred embodiment, the yield strength of the degradable material 22 is not less than 40 MPa, which can provide sufficient support for the spring sheet 23 and prevent the spring sheet 23 from elastically deforming after being compressed, thereby achieving early stable fixation.

[0037] As a preferred embodiment, the degradable material 22 is a magnesium-calcium alloy or a magnesium-zinc alloy.

[0038] See Figures 4 to 6 Furthermore, in this embodiment, a slide groove 12 is provided on the side wall of the hollow portion 11, and an extension portion 24 is provided around the slide plate 2, which is embedded in the slide groove 12, and the filling area 21 and the spring piece 23 are provided on the extension portion 24. Through the cooperation between the slide groove 12 and the extension portion 24, the stability of the bone plate is improved, so that the slide plate 2 can only perform axial micro-movement without lateral movement. The filling area 21 and the spring piece 23 are provided on the extension portion 24, and correspondingly extend into the slide groove 12, which is relatively closed. Even if the spring piece 23 breaks accidentally, it cannot escape from the gap to cause foreign matter, and the slide plate 2 can still perform axial micro-movement.

[0039] As a preferred embodiment, the corresponding parts of the slide groove 12 and the two sides of the main board 1 are dovetail grooves (that is, the cross-section is a trapezoidal structure, with a large bottom width and a small opening width), which is beneficial to prevent the lateral movement of the slide plate 2. The corresponding parts of the slide groove 12 and the end of the main board 1 are rectangular grooves to avoid hindering the axial micro-movement of the slide plate 2. The structure is reasonable and effective.

[0040] As a preferred embodiment, the mounting portion 3 may be a locking screw hole or a locking pressurizing hole with threads.

[0041] See Figure 1 and Figure 2 As a preferred embodiment, the mounting portion 3 on the main board 1 is symmetrically distributed with the mounting portion 3 on the slide plate 2. In this embodiment, five threaded locking screw holes are respectively provided on the main board 1 and the slide plate 2, and are symmetrically distributed, which is conducive to maintaining uniform force along the length direction of the main board 1 in the early stage.

[0042] See Figure 3 In this embodiment, the edges of the upper and lower surfaces of the main board 1 are provided with thickened portions 13, that is, the edges of the main board 1 are thicker and the middle area is thinner, which can increase the mechanical properties of the bone plate and reduce the contact area between the main board 1 and the bone (the femur 4 in this embodiment), which is more conducive to the healing of fractures. The structure is simple and effective.

[0043] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A variable fixation bone plate, characterized in that: The invention comprises a main board (1) and a slide plate (2), wherein one end of the main board (1) is provided with a hollow portion (11), the slide plate (2) is arranged on the hollow portion (11), the main board (1) and the slide plate (2) are both provided with a mounting portion (3), at least one end of the slide plate (2) is provided with a filling area (21) and a spring sheet (23), the filling area (21) is filled with a degradable substance (22), and when the degradable substance (22) filled in the filling area (21) is degraded, the spring sheet (23) can be elastically deformed when being squeezed.

2. The variable fixation bone plate according to claim 1, characterized in that: The filling area (21) comprises an arc-shaped area, the width of which gradually decreases from the middle to both sides.

3. The variable fixation bone plate according to claim 2, characterized in that: A convex portion is provided in the middle of the arc-shaped area, and the elastic sheets (23) are located on both sides of the convex portion.

4. The variable fixation bone plate according to claim 1, characterized in that: The yield strength of the degradable material (22) is not less than 40 MPa.

5. The variable fixation bone plate according to claim 4, characterized in that: The degradable material (22) is a magnesium-calcium alloy or a magnesium-zinc alloy.

6. The variable fixation bone fracture plate according to any one of claims 1 to 5, characterized in that: A slide groove (12) is provided on the side wall of the hollow portion (11), an extension portion (24) is provided around the slide plate (2), the extension portion (24) is embedded in the slide groove (12), and the filling area (21) and the spring sheet (23) are arranged on the extension portion (24).

7. The variable fixation bone plate according to claim 6, characterized in that: The corresponding parts of the slide groove (12) and the two sides of the main board (1) are dovetail grooves, and the corresponding parts of the slide groove (12) and the end of the main board (1) are rectangular grooves.

8. The variable fixation bone plate according to any one of claims 1 to 5, characterized in that: The mounting portion (3) is a locking screw hole or a locking pressure hole with a thread.

9. The variable fixation bone fracture plate according to any one of claims 1 to 5, characterized in that: The mounting portion (3) on the main board (1) and the mounting portion (3) on the slide plate (2) are symmetrically distributed.

10. The variable fixation bone fracture plate according to any one of claims 1 to 5, characterized in that: Thickened portions (13) are provided at the edges of the upper and lower surfaces of the main board (1).

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