Biodegradable zinc alloy bone plate

Abstract

The application relates to the technical field of medical devices, in particular to a biodegradable zinc alloy bone plate. The biodegradable zinc alloy bone plate connects two fractured bone parts through locking screws and pressure screws, and comprises a bone plate and adjusting mechanisms; each adjusting mechanism comprises a worm wheel, an arc-shaped block and a first driving unit. A locking hole and a sliding hole are formed in each worm wheel. Each pressure screw is arranged in a sliding hole and is in contact with the inner side wall of the arc-shaped block. The first driving unit is used for driving the worm wheel to rotate, so that the plane where the connecting line of the centers of the locking hole and the sliding hole is located is kept perpendicular to the plane where the fracture extension direction of the bone is located, and when the pressure screw and the arc-shaped block cooperate, the pressure generated by the cooperation is perpendicular to the plane where the fracture extension direction of the bone is located, so that the biodegradable zinc alloy bone plate can adapt to various fracture surface directions. The application provides the biodegradable zinc alloy bone plate to solve the problem that the pressure direction of the existing bone plate on the bone is not adjustable.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a biodegradable zinc alloy bone plate. Background Technology

[0002] Bone plates are perforated plate-shaped medical devices used for internal fixation of fractures in orthopedic surgery. Used in conjunction with screws, they form a stable connection with the bone to promote healing. Their development has evolved from limited contact dynamic compression plates (LC-DCP) to locking compression plates (LCP), aiming to gradually reduce interference with periosteal blood supply. Bone plates are primarily made of metals such as stainless steel and titanium alloys; in recent years, absorbable biomaterials have also been increasingly used in low-load areas. Depending on their function, bone plates can be divided into two categories: ordinary steel plates and locking steel plates, offering various fixation modes such as neutralization, bridging, and support. Their typical structure includes a rod, a head, and an extension, using a porous design to achieve three-dimensional fixation of the fracture site.

[0003] Biodegradable zinc alloy bone plates are medical implants that can gradually degrade, be absorbed, or be metabolized and excreted from the body, used to fix fracture sites. Biodegradable zinc alloy bone plates represent a revolutionary internal fixation implant in orthopedics. Compared to traditional stainless steel and titanium alloy permanent implants, as well as other biodegradable materials—magnesium alloys and polylactic acid (PLA)—zinc alloys exhibit a unique and promising potential balance between degradation rate, mechanical properties, and biocompatibility.

[0004] For example, the invention patent with announcement number CN114098936B provides a biodegradable biomimetic double-layer humeral bone plate. This invention, through the combined use of a biodegradable bone plate and biodegradable hollow screws, can avoid secondary surgery, effectively reduce the elastic modulus, reduce stress shielding, promote trabecular and cortical bone reconstruction, and accelerate fracture healing. However, because the fracture surface morphology is often not a standard straight line, the compression direction of this bone plate cannot be adjusted. If the pressure generated by the hollow screw is not perpendicular to the plane of the bone fracture extension direction, it may lead to uneven stress at the fracture surface, thereby causing secondary damage to the bone and affecting the stable connection of the two fracture ends. In addition, the density of bones varies with age and location, and the compression amount of this bone plate cannot be adjusted accordingly, making it difficult to adapt to different bone densities and posing a risk of bone damage. Summary of the Invention

[0005] This invention provides a biodegradable zinc alloy bone plate to solve the problems of existing bone plates having no adjustable pressure direction and no adjustable pressure amount.

[0006] The present invention discloses a biodegradable zinc alloy bone plate, employing the following technical solution: A biodegradable zinc alloy bone plate connects two broken bone parts using multiple locking screws and multiple compression screws, comprising a bone plate and multiple adjustment mechanisms. The two bone parts are sequentially distributed in a first direction. The bone plate is positioned along the first direction. The bone plate is positioned along the first direction, with a first side and a second side on either side of a second direction perpendicular to the first direction. The first side of the bone plate abuts against the bone, while the second side faces away from the bone.

[0007] The bone plate has two mounting hole assemblies distributed along a first direction, and each mounting hole assembly includes multiple first through holes distributed sequentially along the first direction. The axis of the first through holes is set along a second direction.

[0008] Each adjusting mechanism includes a worm gear, an arc-shaped block, and a first drive unit. Each worm gear is rotatably disposed within a first through hole and is coaxial with the first through hole. Each worm gear has a locking hole and a sliding hole. The axial directions of both the locking hole and the sliding hole are along a second direction. Each locking screw is disposed within a locking hole. The arc-shaped block is rotatably disposed within a sliding hole, and each pressure screw is disposed within a sliding hole and contacts the inner sidewall of the arc-shaped block.

[0009] The fracture surfaces of both bone sections are located between two mounting hole assemblies. The first drive unit is used to drive the worm gear to rotate, so that the plane containing the line connecting the center of the locking hole and the center of the sliding hole is perpendicular to the plane containing the direction of bone fracture extension, in order to accommodate various bone fracture surface directions.

[0010] Furthermore, the arc-shaped block includes a first arc plate and a second arc plate. The first arc plate and the sliding hole are coaxially arranged, and the first arc plate can rotate around its own axis. The outer ring of the second arc plate is arc-shaped, and the outer ring of the second arc plate is coaxially arranged with the first arc plate and fixedly connected to the inner ring of the first arc plate. Along the circumference of the sliding hole, the two sides of the second arc plate are the third side and the fourth side, respectively. Along the direction from the third side to the fourth side, the thickness of the second arc plate in the radial direction of the sliding hole gradually decreases.

[0011] The inner ring of the second arc plate has a bevel, which is located on the first side of the second arc plate closest to the bone plate. The slope of the bevel gradually increases from the third to the fourth side. The bevel is used to abut against the head of the compression screw. When the compression screw contacts the bevel, the pressure applied by the bevel to the compression screw is positively correlated with the slope of the bevel.

[0012] Furthermore, the sliding hole and locking hole on each worm gear are connected. The sliding hole in each mounting hole assembly is located on the side away from the bone fracture surface relative to the locking hole.

[0013] Furthermore, the bone plate is rotatably equipped with multiple first worm gears, which are arranged along a third direction perpendicular to the first and second directions. Each first worm gear meshes with a worm wheel.

[0014] Furthermore, an arc-shaped rack is fixedly installed on the outer peripheral wall of each first arc plate. Multiple second worm gears are rotatably mounted on the bone plate, each second worm gear being positioned along a third direction. Each second worm gear meshes with an arc-shaped rack.

[0015] Furthermore, a first annular groove is formed within the first through hole, and the first annular groove and the first through hole are coaxially arranged. At least two first locking blocks are fixedly arranged on the outer peripheral wall of the worm gear, and the two first locking blocks are distributed sequentially along the circumference of the worm gear, and the first locking blocks are slidably disposed within the first annular groove.

[0016] Furthermore, two openings are formed on the circumferential side of the first annular groove wall, and each first locking block can enter the first annular groove through one opening.

[0017] Furthermore, a second annular groove is formed within each sliding hole, and the second annular groove is coaxially arranged with the sliding hole. A second locking block is fixedly arranged on the outer wall of each first arc plate, and the second locking block is slidably disposed within the second annular groove.

[0018] Furthermore, two protrusions are fixedly provided on the first side of the bone plate, and the two protrusions are distributed sequentially along the first direction. The protrusions abut against the bone and are located on both sides of the bone joint to reduce the obstruction of the bone fracture surface by the bone plate.

[0019] Furthermore, the first side of the bone plate is a concave arc surface facing the bone to adapt to the shape of the bone.

[0020] The beneficial effects of this invention are as follows: A biodegradable zinc alloy bone plate of this invention, through an adjustment mechanism, positions the bone fracture surface between two mounting hole assemblies. A first drive unit rotates the worm gear, ensuring that the plane connecting the centers of the locking hole and the sliding hole is perpendicular to the plane representing the direction of bone fracture extension. This allows the pressure generated when the pressure screw and the arc-shaped block engage to be perpendicular to the plane representing the direction of bone fracture extension, accommodating various fracture surface directions. This design, by making the plane connecting the centers of the locking hole and the sliding hole perpendicular to the plane representing the direction of bone fracture extension, provides optimized mechanical fixation, facilitating stable connection of the two fractured bone segments and reducing adverse stress or potential damage risk to the bone. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a biodegradable zinc alloy bone plate provided in an embodiment of the present invention;

[0023] Figure 2 A side view of a biodegradable zinc alloy bone plate provided in an embodiment of the present invention;

[0024] Figure 3 for Figure 2 Sectional view along the BB direction;

[0025] Figure 4 for Figure 1 Enlarged view of point A in the middle;

[0026] Figure 5 for Figure 3 Enlarged view of point C in the middle;

[0027] Figure 6 A schematic diagram of the adjustment mechanism of a biodegradable zinc alloy bone plate provided in an embodiment of the present invention;

[0028] Figure 7 This is a partial structural schematic diagram of a biodegradable zinc alloy bone plate provided in an embodiment of the present invention;

[0029] Figure 8 for Figure 7 Enlarged view of point D in the middle;

[0030] Figure 9 A cross-sectional view of a worm gear in a biodegradable zinc alloy bone plate provided in an embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram of the structure of an arc-shaped block of a biodegradable zinc alloy bone plate provided in an embodiment of the present invention;

[0032] Figure 11 This is a top view of an arc-shaped block of a biodegradable zinc alloy bone plate provided in an embodiment of the present invention.

[0033] In the diagram: 100, bone plate; 101, first through hole; 102, first annular groove; 103, opening; 110, protrusion; 200, worm gear; 201, first locking block; 210, locking hole; 220, sliding hole; 221, second annular groove; 230, first worm; 300, first arc plate; 301, arc rack; 302, second locking block; 310, second arc plate; 311, inclined plane; 320, second worm. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Reference Figures 1 to 11 As shown in the illustration, an embodiment of the present invention provides a biodegradable zinc alloy bone plate that connects two broken bone fragments using multiple locking screws and multiple compression screws. The plate includes a bone plate 100 and multiple adjustment mechanisms. The two bone fragments are sequentially distributed in a first direction. The bone plate 100 is positioned along the first direction. The bone plate 100 has a first side and a second side along a second direction, which is perpendicular to the first direction. The first side of the bone plate 100 abuts against the bone, while the second side faces away from the bone.

[0036] The bone plate 100 has two mounting hole assemblies distributed along a first direction. Each mounting hole assembly includes a plurality of first through holes 101 distributed sequentially along the first direction. The first through holes 101 penetrate through a first side and a second side of the bone plate 100, and the axis of the first through holes 101 is arranged along a second direction.

[0037] Each adjusting mechanism includes a worm gear 200, an arc-shaped block, and a first drive unit. Each worm gear 200 is rotatably disposed within a first through hole 101 and is coaxial with the first through hole 101. Each worm gear 200 has a locking hole 210 and a sliding hole 220 extending through it. The axial directions of both the locking hole 210 and the sliding hole 220 are along a second direction. Each locking screw is disposed within a locking hole 210. The arc-shaped block is rotatably disposed within a sliding hole 220, and each pressure screw is disposed within a sliding hole 220 and contacts the inner sidewall of the arc-shaped block.

[0038] Both fracture surfaces of the bone fragments are located between two mounting hole assemblies. The first drive unit rotates the worm gear 200, ensuring that the plane connecting the center of the locking hole 210 and the center of the sliding hole 220 is perpendicular to the plane indicating the direction of the bone fracture. This allows the pressure generated when the pressure screw and the arc-shaped block engage to be perpendicular to the plane indicating the direction of the bone fracture, accommodating various fracture surface directions. This design, by making the plane connecting the centers of the locking hole 210 and the sliding hole 220 perpendicular to the plane indicating the direction of the bone fracture, provides optimized mechanical fixation, facilitating stable docking of the two fractured bone fragments and reducing adverse stress or potential damage risks to the bone.

[0039] In this embodiment, the arc-shaped block includes a first arc plate 300 and a second arc plate 310. The first arc plate 300 and the sliding hole 220 are coaxially arranged, and the first arc plate 300 can rotate around its own axis. The outer ring of the second arc plate 310 is arc-shaped, and the outer ring of the second arc plate 310 is coaxially arranged with the first arc plate 300 and fixedly connected to the inner ring of the first arc plate 300. Along the circumference of the sliding hole 220, the two sides of the second arc plate 310 are the third side and the fourth side, respectively. Along the direction from the third side to the fourth side, the thickness of the second arc plate 310 in the radial direction of the sliding hole 220 gradually decreases.

[0040] The inner ring of the second arc plate 310 has a bevel 311, and the bevel 311 is located on the first side of the second arc plate 310 near the bone plate 100. The slope of the bevel 311 gradually increases from the third side to the fourth side. The bevel 311 is used to abut against the head of the compression screw. When the compression screw contacts the bevel 311, the pressure exerted by the bevel 311 on the compression screw is positively correlated with the slope of the bevel 311.

[0041] Bone density determines its compressive strength; the higher the density, the stronger the compressive strength. The steeper the slope of ramp 311, the greater the pressure exerted by the ramp 311 on the compression screw when it contacts the ramp. Conversely, the gentler the slope of ramp 311, the less pressure exerted by the ramp 311 on the compression screw when it contacts the ramp. Therefore, the lower the bone density, the less force needs to be applied to the bone through ramp 311.

[0042] Rotate the arc block to adjust the angle of the inclined plane 311, creating an area on the inclined plane 311 with the desired slope (matching bone density), precisely aligning it with the line connecting the centers of the locking hole 210 and the sliding hole 220 on the current worm gear 200. Once this area of ​​the inclined plane 311 contacts the head of the pressure screw, a preset pressure can be applied. By adjusting the slope of the inclined plane 311 in contact with the pressure screw, it can be adapted to bones of different densities, preventing damage to the bone.

[0043] In this embodiment, the sliding hole 220 and the locking hole 210 on each worm gear 200 are connected. The sliding hole 220 in each mounting hole assembly is located on the side away from the bone fracture surface relative to the locking hole 210. The sliding hole 220 is located away from the bone fracture surface to allow controlled and beneficial micromovement (stimulating healing) to occur between the strong part of the bone and the bone plate 100, rather than at the fragile newly formed callus, thereby avoiding malunion or fixation failure.

[0044] In this embodiment, a plurality of first worm gears 230 are rotatably disposed on the bone plate 100. The first worm gears 230 are disposed along a third direction, which is perpendicular to the first and second directions. Each first worm gear 230 meshes with a worm wheel 200. Rotating the first worm gear 230 drives the worm wheel 200 to rotate.

[0045] In this embodiment, an arc-shaped rack 301 is fixedly disposed on the outer peripheral wall of each first arc plate 300. A plurality of second worm gears 320 are rotatably disposed on the bone plate 100, each second worm gear 320 being disposed along a third direction. Each second worm gear 320 meshes with an arc-shaped rack 301. Rotating the second worm gear 320 causes the arc-shaped block to rotate.

[0046] In this embodiment, a first annular groove 102 is formed in the first through hole 101, and the first annular groove 102 and the first through hole 101 are coaxially arranged. At least two first locking blocks 201 are fixedly arranged on the outer peripheral wall of the worm gear 200. The two first locking blocks 201 are distributed sequentially along the circumference of the worm gear 200, and the first locking blocks 201 are slidably arranged in the first annular groove 102.

[0047] In this embodiment, two openings 103 are formed on the wall of the first annular groove 102 along its circumference, and each first locking block 201 can enter the first annular groove 102 through one opening 103.

[0048] In this embodiment, a second annular groove 221 is formed in each sliding hole 220, and the second annular groove 221 and the sliding hole 220 are coaxially arranged. A second locking block 302 is fixedly arranged on the outer wall of each first arc plate 300, and the second locking block 302 is slidably disposed in the second annular groove 221. Since the sliding hole 220 and the locking hole 210 are connected, when installing the arc block, the second locking block 302 is first placed in the locking hole 210, and then the arc block is rotated to screw the second locking block 302 into the second annular groove 221.

[0049] In this embodiment, two protrusions 110 are fixedly provided on the first side of the bone plate 100, and the two protrusions 110 are distributed sequentially along the first direction. The protrusions 110 abut against the bone and are located on both sides of the bone joint to reduce the obstruction of the bone fracture surface by the bone plate 100.

[0050] In this embodiment, the first side of the bone plate 100 is a concave arc surface facing the bone to adapt to the shape of the bone.

[0051] Working process: First, the first side of the bone plate 100 is placed against the bone, so that the fracture surface of the bone is between the two mounting hole assemblies. Then, the first worm 230 is rotated, which drives the worm wheel 200 to rotate, so that the plane containing the line connecting the center of the locking hole 210 and the center of the sliding hole 220 on each worm wheel 200 is perpendicular to the plane containing the direction of bone fracture extension.

[0052] First, a positioning hole is drilled into the bone through the sliding hole 220. The axis of the positioning hole is located on the extension line of the line connecting the center of the locking hole 210 and the center of the sliding hole 220, and the positioning hole is tangent to the inner side of the second arc plate 310. Next, the compression screw is aligned with the positioning hole and screwed in. When the head of the compression screw abuts against the inclined surface 311 on the arc block, the inclined surface 311 generates a component force, pushing the compression screw (and the bone it fixes) towards the other bone, thereby bringing the two broken bone parts closer together. After the compression screw is installed, the locking screw is placed in the locking hole 210.

[0053] This design provides optimized mechanical fixation by making the plane connecting the centers of the locking hole 210 and the sliding hole 220 perpendicular to the plane containing the direction of bone fracture extension. This helps to stably connect the two fractured bone parts, thereby reducing adverse stress or potential damage risk to the bone.

[0054] Bone density determines its compressive strength; the higher the density, the stronger the compressive strength. The steeper the slope of ramp 311, the greater the pressure exerted by the ramp 311 on the compression screw when it contacts the ramp. Conversely, the gentler the slope of ramp 311, the less pressure exerted by the ramp 311 on the compression screw when it contacts the ramp. Therefore, the lower the bone density, the less force needs to be applied to the bone through ramp 311.

[0055] Rotating the second worm gear 320 causes the arc-shaped block to rotate, thereby adjusting the angle of the inclined plane 311. This adjusts the area on the inclined plane 311 to have the required slope (matching bone density), precisely aligning it with the line connecting the centers of the locking hole 210 and the sliding hole 220 on the current worm gear 200. Once this area of ​​the inclined plane 311 contacts the head of the pressure screw, a preset pressure can be applied. By adjusting the slope of the inclined plane 311 in contact with the pressure screw, it can be adapted to bones of different densities, preventing damage to the bone.

[0056] 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, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A biodegradable zinc alloy bone plate, which connects two broken bone sections using multiple locking screws and multiple compression screws, characterized in that: It includes a bone plate and multiple adjustment mechanisms; the direction in which the two parts of the bone are distributed sequentially is the first direction; the bone plate is set along the first direction; the two sides of the bone plate along the second direction are the first side and the second side, respectively, the second direction is perpendicular to the first direction, the first side of the bone plate abuts against the bone, and the second side is away from the bone; The bone plate has two mounting hole assemblies distributed along a first direction. Each mounting hole assembly includes multiple first through holes distributed sequentially along the first direction. The first through holes penetrate the first side and the second side of the bone plate. The axis of the first through holes is set along the second direction. Each adjustment mechanism includes a worm gear, an arc-shaped block, and a first drive unit; each worm gear is rotatably disposed in a first through hole and is coaxial with the first through hole; each worm gear has a locking hole and a sliding hole that pass through the worm gear; the axial directions of the locking hole and the sliding hole are both arranged along a second direction; each locking screw is disposed in a locking hole; the arc-shaped block is rotatably disposed in a sliding hole, and each pressure screw is disposed in a sliding hole and contacts the inner sidewall of the arc-shaped block; The fracture surfaces of both bone parts are located between the two mounting hole assemblies; the first drive unit is used to drive the worm gear to rotate, so that the plane containing the line connecting the center of the locking hole and the center of the sliding hole is perpendicular to the plane containing the direction of bone fracture extension, in order to adapt to various bone fracture surface directions. The arc-shaped block includes a first arc plate and a second arc plate. The first arc plate and the sliding hole are coaxially arranged, and the first arc plate can rotate around its own axis. The outer ring of the second arc plate is arc-shaped, and the outer ring of the second arc plate is coaxial with the first arc plate and fixedly connected to the inner ring of the first arc plate; along the circumference of the sliding hole, the two sides of the second arc plate are the third side and the fourth side, respectively; along the direction from the third side to the fourth side, the thickness of the second arc plate in the radial direction of the sliding hole gradually decreases. The inner ring of the second arc plate has a bevel, and the bevel is located on the first side of the second arc plate near the bone plate; the slope of the bevel gradually increases along the direction from the third side to the fourth side; the bevel is used to abut against the head of the compression screw; when the compression screw contacts the bevel, the pressure applied by the bevel to the compression screw is positively correlated with the slope of the bevel.

2. The biodegradable zinc alloy bone plate according to claim 1, characterized in that: The sliding hole and locking hole on each worm gear are connected; the sliding hole in each mounting hole assembly is located on the side away from the bone fracture surface relative to the locking hole.

3. The biodegradable zinc alloy bone plate according to claim 1, characterized in that: Multiple first worm gears are rotatably mounted on the bone plate. The first worm gears are arranged along a third direction, which is perpendicular to the first and second directions. Each first worm gear meshes with a worm wheel.

4. The biodegradable zinc alloy bone plate according to claim 3, characterized in that: An arc-shaped rack is fixedly installed on the outer peripheral wall of each first arc plate; multiple second worms are rotatably installed on the bone plate, each second worm being arranged along a third direction; each second worm meshes with an arc-shaped rack.

5. The biodegradable zinc alloy bone plate according to claim 1, characterized in that: A first annular groove is provided in the first through hole, and the first annular groove and the first through hole are coaxially arranged; at least two first locking blocks are fixedly provided on the outer peripheral wall of the worm wheel, and the two first locking blocks are distributed sequentially along the circumference of the worm wheel, and the first locking blocks are slidably disposed in the first annular groove.

6. The biodegradable zinc alloy bone plate according to claim 5, characterized in that: Two openings are formed on the circumferential side of the first annular groove wall, and each first locking block can enter the first annular groove through one of the openings.

7. The biodegradable zinc alloy bone plate according to claim 1, characterized in that: Each sliding hole has a second annular groove, which is coaxial with the sliding hole; a second locking block is fixedly installed on the outer wall of each first arc plate, and the second locking block is slidably installed in the second annular groove.

8. The biodegradable zinc alloy bone plate according to claim 1, characterized in that: Two protrusions are fixedly provided on the first side of the bone plate, and the two protrusions are distributed sequentially along the first direction; the protrusions abut against the bone and are located on both sides of the bone joint to reduce the obstruction of the bone fracture surface by the bone plate.

9. The biodegradable zinc alloy bone plate according to claim 1, characterized in that: The first side of the bone plate is a concave arc surface facing the bone to fit the shape of the bone.

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