Magnesium alloy coating support for treating limb fracture and using method

Abstract

The invention discloses a magnesium alloy coating support for treating limb fracture and a using method, and relates to the technical field of orthopedic stents.The magnesium alloy coating support comprises a fixing mechanism and a universal mechanism, a connecting rod is arranged in the fixing mechanism, one end of the connecting rod is fixedly connected with a conical block, and a hexagonal groove is formed in the other end of the connecting rod; mounting rods are arranged at the two ends of the universal mechanism, a first clamping piece is arranged at one end of each mounting rod, the fixing mechanism comprises a bone nail, and limiting grooves are symmetrically formed in the outer portion of the bone nail. Through the arrangement of the fixing mechanism, after the connecting rod is installed, a conical block ejects a steel ball out, and the steel ball is clamped outside a bone, so that the bone nail is not prone to loosening, the connecting rod cannot be loosened, stability is improved, meanwhile, the fixing mechanism is made of magnesium alloy, and after the bone of a patient is healed, the fixing mechanism does not need to be taken out; the bone can be degraded in vivo, and holes formed in the bone are healed in the degradation process, so that the overall strength of the bone cannot be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of orthopedic stents, and in particular to a magnesium alloy coated stent for treating limb fractures and a use method thereof. Background Art

[0002] At present, fracture fixation includes internal fixation and external fixation technology. Internal fixation is currently mainly steel plate and screw internal fixation, which involves more periosteal stripping and a complicated reduction process. The main problem is that if the fracture is not tightly aligned after the screws are inserted, it cannot be adjusted, and the blood supply to the fracture end is greatly damaged. In the field of Weigao orthopedics and spinal surgery, there are extensive spinal nail and rod fixation systems. The structures of various nail and rod fixation systems are similar, with high fixation strength, and they are mainly used for posterior thoracic and lumbar internal fixation. However, they cannot be used and no one has used them for percutaneous reduction and internal fixation of limb fractures.

[0003] After searching the publication number CN109925037A, a fracture lateral fixation bracket is disclosed, comprising a bracket base plate, both ends of the bracket base plate are provided with extension brackets, one end of the extension bracket away from the bracket base plate is fixedly connected to a connecting rod, and a fixed sleeve is fixedly connected to the outside of the connecting rod, and the extension bracket is slidably connected to the bracket base plate through a slot, a first limiting slide bar and a second limiting slide bar, which are matched with a rack plate, a first limiting slide groove and a second limiting slide groove respectively, so that the extension bracket is slidably connected to the bracket base plate, and the length and angle can be flexibly adjusted, which is convenient for fixing bones. However, the installation strength of the bone nail is low, and the bone nail is easy to loosen after wearing for a long time, thereby changing the position of the bone. When the bone heals, the bone nail needs to be removed, and a hole will be left in the bone after removal. The hole takes several months to recover. During this period of time, the strength of the bone is reduced, which affects the recovery training, and only two bone nails located on the same horizontal line can be fixed, and the position of the bone nail is different according to the different fracture conditions of the patient, resulting in poor adaptability.

[0004] Based on this, a magnesium alloy coated stent for treating limb fractures and a method of use are now provided, which can eliminate the disadvantages of existing devices. Summary of the invention

[0005] The purpose of the present invention is to provide a magnesium alloy coated stent for treating limb fractures and a method of use, so as to solve the problems in the background art that the bone nail pins are unstable to install and inconvenient to disassemble after recovery.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A magnesium alloy coated stent for treating limb fractures comprises a fixing mechanism and a universal mechanism, a connecting rod is arranged inside the fixing mechanism, one end of the connecting rod is fixedly connected to a cone block, the other end of the connecting rod is provided with a hexagonal groove, mounting rods are arranged at both ends of the universal mechanism, one end of the mounting rod is provided with a first clamping piece, the fixing mechanism comprises a bone screw, limiting grooves are symmetrically arranged on the outside of the bone screw, steel balls are placed inside the limiting grooves, a first key groove is arranged at one end of the bone screw, a threaded groove is arranged on the inner wall of the bone screw, the connecting rod is threadedly connected to the bone screw via the threaded groove, and the fixing mechanism is made of magnesium alloy.

[0008] On the basis of the above technical solution, the present invention also provides the following optional technical solution:

[0009] In an optional solution: a moving component is provided at one end of the first clamping member.

[0010] In an optional solution: the moving component includes a slider, which is fixedly mounted on one end of a first clamping member, a second clamping member is slidably mounted on the outside of the slider, a sliding groove matching the slider is opened at one end of the second clamping member, and a first bolt is threadedly connected to the top of the second clamping member.

[0011] In an optional solution: a clamping plate is attached to the outer side of the second clamping member and the first clamping member, a through hole is provided on the outer side of the clamping plate, and an installation groove is provided on the outer side of the second clamping member and the first clamping member at a position corresponding to the through hole, a second bolt passes through the outer side of the clamping plate through the through hole, and the second bolt is threadedly connected to the second clamping member and the first clamping member respectively through the installation groove.

[0012] In an optional solution: the diameter of the through hole is larger than the diameter of the mounting groove.

[0013] In an optional solution, the connecting rod is located between the clamping plate and the second clamping member.

[0014] In an optional solution: the universal mechanism includes a universal joint, the universal joint and the mounting rod are slidably mounted, a fixing sleeve is symmetrically provided on the outside of the universal joint, a pin is slidably mounted inside the fixing sleeve, one end of the pin passes through the fixing sleeve and is fixedly mounted with a handle, a limit plate is fixedly connected to the outside of the pin and located inside the fixing sleeve, a spring is provided on one side of the limit plate, the spring sleeve is arranged on the outside of the pin, and a second key slot is provided at both ends of the universal joint.

[0015] In an optional solution: a key block is equidistantly provided in an annular shape at one end of the mounting rod, and the key block is matched with the second key groove.

[0016] In an optional solution: positioning holes are symmetrically opened on the outside of the mounting rod, and the other end of the pin is inserted into the inside of the mounting rod through the positioning hole.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention provides a fixing mechanism. When the connecting rod is installed, the cone block pushes out the steel ball, which is stuck on the outside of the bone, so that the bone nail is not easy to loosen, and the connecting rod will not loosen, thereby improving stability. At the same time, the fixing mechanism is made of magnesium alloy. After the patient's bone heals, there is no need to remove the fixing mechanism, and it can be degraded in the body. During the degradation process, the holes opened in the bone heal, so the overall strength of the bone will not be reduced, and disassembly is convenient.

[0019] 2. The present invention enables the distance between the first clamping member and the second clamping member to be changed by setting the movable assembly, which is convenient for adjustment according to the interval of the connecting rod, thereby improving adaptability;

[0020] 3. The present invention facilitates changing the angle between the two first clamping members through the setting of the universal mechanism, so as to fix the connecting rods that are not in the same horizontal line. At the same time, the universal mechanism is convenient to install and remove, and can be quickly removed when not in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the fixing mechanism structure of the present invention.

[0023] Figure 3 It is a schematic diagram of the structure of the mobile component of the present invention.

[0024] Figure 4 It is a schematic diagram of the connecting rod fixing structure of the present invention.

[0025] Figure 5 It is a schematic diagram of the installation structure of the installation rod of the present invention.

[0026] Figure 6 It is a schematic diagram of the structure of the universal mechanism of the present invention.

[0027] Notes on the figure numbers: 1. fixing mechanism; 101. bone screw; 102. limiting groove; 103. steel ball; 104. first keyway; 105. threaded groove; 2. connecting rod; 3. cone block; 4. hexagonal groove; 5. universal mechanism; 501. universal joint; 502. fixing sleeve; 503. pin; 504. handle; 505. limiting plate; 506. spring; 507. second keyway; 6. mounting rod; 7. first clamping member; 8. slider; 9. second clamping member; 10. slide groove; 11. first bolt; 12. clamping plate; 13. through hole; 14. mounting groove; 15. second bolt; 16. key block; 17. positioning hole. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] In one embodiment, Figure 1-Figure 6 As shown, a magnesium alloy coated stent for treating limb fractures includes a fixing mechanism 1 and a universal mechanism 5, wherein a connecting rod 2 is provided inside the fixing mechanism 1, a cone block 3 is fixedly connected to one end of the connecting rod 2, a hexagonal groove 4 is provided at the other end of the connecting rod 2, mounting rods 6 are provided at both ends of the universal mechanism 5, a first clamping member 7 is provided at one end of the mounting rod 6, the fixing mechanism 1 includes a bone screw 101, a limiting groove 102 is symmetrically provided on the outside of the bone screw 101, a steel ball 103 is placed inside the limiting groove 102, a first key groove 104 is provided at one end of the bone screw 101, a thread groove 105 is provided on the inner wall of the bone screw 101, the connecting rod 2 is threadedly connected to the bone screw 101 through the thread groove 105, and the material of the fixing mechanism 1 is magnesium alloy.

[0030] In this embodiment, positioning drilling is performed at the position where the fixing pin is required, and a tool is inserted into the first keyway 104. The bone screw 101 is rotated and installed into the inside of the bone by drilling, and the bone screw 101 penetrates the bone, and the steel ball 103 is located on the other side of the bone. Then, one end of the connecting rod 2 provided with the cone block 3 is inserted into the inside of the bone screw 101, and the hexagonal groove 4 at the other end of the connecting rod 2 is connected to the tool. The tool is rotated to drive the connecting rod 2 to rotate, so that the connecting rod 2 and the bone screw 101 are threadedly installed. Due to the setting of the cone block 3, the connecting rod 2 pushes part of the steel ball 103 out of the steel ball 103 through the limiting groove 102 during the installation process, thereby improving the stability of the installation of the bone screw 101. After the patient's bone heals, only the connecting rod 2 needs to be removed, and there is no need to remove the bone screw 101. The bone screw 101 and its internal parts will be decomposed and metabolized in the body, and are non-toxic and harmless.

[0031] In one embodiment, Figure 1 and Figure 3As shown, a moving component is provided at one end of the first clamping member 7. The setting of the moving component is convenient for adjustment according to the position of the connecting rod 2, thereby improving adaptability.

[0032] In one embodiment, Figure 1 and Figure 3 As shown, the moving assembly includes a slider 8, which is fixedly mounted on one end of the first clamping member 7. A second clamping member 9 is slidably mounted on the outside of the slider 8. A sliding groove 10 adapted to the slider 8 is opened at one end of the second clamping member 9. A first bolt 11 is threadedly connected to the top of the second clamping member 9. Loosening the first bolt 11 allows the slider 8 to slide inside the sliding groove 10, thereby changing the distance between the second clamping member 9 and the first clamping member 7, which is convenient for adjustment according to the position of the connecting rod 2.

[0033] In one embodiment, Figure 3 and Figure 4 As shown, a clamping plate 12 is attached to one side of the outer side of the second clamping member 9 and the first clamping member 7, a through hole 13 is provided on one side of the outer side of the clamping plate 12, a mounting groove 14 is provided on one side of the outer side of the second clamping member 9 and the first clamping member 7 at a position corresponding to the through hole 13, a second bolt 15 passes through the through hole 13 on the outside of the clamping plate 12, the second bolt 15 is threadedly connected to the second clamping member 9 and the first clamping member 7 respectively through the mounting groove 14, the second bolt 15 is loosened to release the attachment between the clamping plate 12 and the second clamping member 9, the second clamping member 9 is placed on the outside of the connecting rod 2, and the second bolt 15 is tightened, and the connecting rod 2 and the second clamping member 9 are fixed by the clamping of the clamping plate 12.

[0034] In one embodiment, Figure 4 As shown, the aperture of the through hole 13 is larger than the aperture of the mounting groove 14. When the second bolt 15 is loosened, the clamping plate 12 can slide outside the second bolt 15, thereby releasing the fit between the clamping plate 12 and the first clamping member 7, making it easier to fix the connecting rod 2 and the first clamping member 7.

[0035] In one embodiment, Figure 3 and Figure 4 As shown, the connecting rod 2 is located between the clamping plate 12 and the second clamping member 9, and the connecting rod 2 and the second clamping member 9 are conveniently fixed by the clamping plate 12.

[0036] In one embodiment, Figure 6As shown, the universal mechanism 5 includes a universal joint 501, and the universal joint 501 is slidably mounted with the mounting rod 6. The outer portion of the universal joint 501 is symmetrically provided with a fixing sleeve 502, and the inner portion of the fixing sleeve 502 is slidably provided with a pin 503, one end of the pin 503 penetrates the fixing sleeve 502 and is fixedly provided with a handle 504, and the outer portion of the pin 503 and the inner portion of the fixing sleeve 502 are fixedly connected with a limiting plate 505, and a spring 506 is provided on one side of the limiting plate 505, and the spring 506 is sleeved on the outer portion of the pin 503. 1 has a second key slot 507 at both ends, and the two handles 504 are pulled toward the two ends, the pin 503 slides, and the spring 506 is compressed. When the mounting rod 6 is inserted into the innermost part of the universal joint 501, the handle 504 is slowly loosened. Due to the reset effect of the spring 506, the pin 503 moves, and one end of the pin 503 is inserted into the interior of the mounting rod 6 through the positioning hole 17, thereby fixing the mounting rod 6 and the universal joint 501. The setting of the universal joint 501 allows the first clamping members 7 at both ends to be universally adjusted, which is convenient for fixing the uneven connecting rod 2, and greatly improves the adaptability.

[0037] In one embodiment, Figure 5 and Figure 6 As shown, a key block 16 is equidistantly provided in a ring shape at one end of the mounting rod 6 , and the key block 16 and the second key groove 507 are adapted to each other. The cooperation between the key block 16 and the second key groove 507 improves the stability of the installation of the mounting rod 6 and the universal joint 501 .

[0038] In one embodiment, Figure 5 and Figure 6 As shown, the outside of the mounting rod 6 is symmetrically provided with positioning holes 17, and the other end of the inserting pin 503 is inserted into the inside of the mounting rod 6 through the positioning hole 17. This structure facilitates the installation or removal of the universal joint 501 and reduces the difficulty of installation.

[0039] The working principle of the present invention is: perform positioning drilling at the position where the fixing pin is required, use a tool to insert into the first keyway 104, rotate the bone screw 101 to install it inside the bone through drilling, and the bone screw 101 penetrates the bone, and the steel ball 103 is located on the other side of the bone, and then insert one end of the connecting rod 2 with the cone block 3 into the interior of the bone screw 101, and the hexagonal groove 4 at the other end of the connecting rod 2 is connected to the tool, and the tool is rotated to drive the connecting rod 2 to rotate, so that the connecting rod 2 and the bone screw 101 are threadedly installed. Due to the setting of the cone block 3, the connecting rod 2 pushes part of the steel ball 103 out of the steel ball 103 through the limiting groove 102 during the installation process, thereby improving the stability of the installation of the bone screw 101.

[0040] After multiple connecting rods 2 are installed, loosen the second bolt 15 to release the fit between the clamp 12 and the second clamp 9, place the second clamp 9 on the outside of the connecting rod 2, and then tighten the second bolt 15. The connecting rod 2 and the second clamp 9 are fixed by the clamping of the clamp 12. Loosen the first bolt 11 so that the slider 8 can slide inside the slide groove 10, thereby changing the distance between the second clamp 9 and the first clamp 7. Similarly, fix another connecting rod 2 to the first clamp 7, and then tighten the first bolt 11 to fix the second clamp 9 to the first clamp 7.

[0041] When the position of the connecting rod 2 is not aligned, one end of the mounting rod 6 is inserted into the interior of the universal joint 501 through the cooperation of the key block 16 and the second key slot 507, and the two handles 504 are pulled toward both ends, the pin 503 slides, and the spring 506 is compressed. When the mounting rod 6 is inserted into the innermost part of the universal joint 501, the handle 504 is slowly loosened. Due to the reset effect of the spring 506, the pin 503 moves, and one end of the pin 503 is inserted into the interior of the mounting rod 6 through the positioning hole 17, thereby fixing the mounting rod 6 to the universal joint 501. The other end of the universal joint 501 is installed in the same way. Through the setting of the universal joint 501, the first clamping members 7 at both ends can be universally adjusted, which is convenient for fixing the uneven connecting rod 2 and greatly improves the adaptability.

[0042] When the patient's bone heals and the bracket needs to be removed, first loosen the second bolt 15 so that the connecting rod 2 can be separated from the second clamp 9 and the first clamp 7, and then use a tool to connect it to the hexagonal slot 4, and rotate the tool in the opposite direction to make the connecting rod 2 rotate in the opposite direction. The connecting rod 2 is separated from the bone screw 101 and taken out. Since the parts of the fixing mechanism 1 are all magnesium alloy, they can be degraded inside the human body and are harmless to the body, so there is no need to take them out.

[0043] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A magnesium alloy coated stent for treating limb fractures, comprising a fixing mechanism (1) and a universal mechanism (5), characterized in that: A connecting rod (2) is provided inside the fixing mechanism (1), one end of the connecting rod (2) is fixedly connected to a cone block (3), the other end of the connecting rod (2) is provided with a hexagonal groove (4), both ends of the universal mechanism (5) are provided with mounting rods (6), one end of the mounting rod (6) is provided with a first clamping member (7), the fixing mechanism (1) comprises a bone screw (101), the outside of the bone screw (101) is symmetrically provided with a limiting groove (102), a steel ball (103) is placed inside the limiting groove (102), one end of the bone screw (101) is provided with a first key groove (104), the inner wall of the bone screw (101) is provided with a threaded groove (105), and the connecting rod (2) is threadedly connected to the bone screw (101) through the threaded groove (105).

2. A magnesium alloy coated stent for treating limb fractures according to claim 1, characterized in that The fixing mechanism (1) is made of magnesium alloy, and a moving component is provided at one end of the first clamping member (7).

3. A magnesium alloy coated stent for treating limb fractures according to claim 2, characterized in that: The moving assembly comprises a slider (8), wherein the slider (8) is fixedly mounted on one end of a first clamping member (7), a second clamping member (9) is slidably mounted on the outside of the slider (8), a sliding groove (10) adapted to the slider (8) is formed at one end of the second clamping member (9), and a first bolt (11) is threadedly connected to the top of the second clamping member (9).

4. A magnesium alloy coated stent for treating limb fractures according to claim 3, characterized in that: The second clamping member (9) and the first clamping member (7) are both attached with a clamping plate (12) on one side of their outer sides, a through hole (13) is provided on one side of the clamping plate (12), and a mounting groove (14) is provided on one side of the second clamping member (9) and the first clamping member (7) at a position corresponding to the through hole (13), and a second bolt (15) passes through the through hole (13) on the outside of the clamping plate (12), and the second bolt (15) is threadedly connected to the second clamping member (9) and the first clamping member (7) respectively through the mounting groove (14).

5. A magnesium alloy coated stent for treating limb fractures according to claim 4, characterized in that: The diameter of the through hole (13) is larger than the diameter of the mounting groove (14).

6. A magnesium alloy coated stent for treating limb fractures according to claim 4, characterized in that: The connecting rod (2) is located between the clamping plate (12) and the second clamping member (9).

7. The magnesium alloy coated stent for treating limb fractures according to claim 1, characterized in that: The universal mechanism (5) comprises a universal joint (501), wherein the universal joint (501) and the mounting rod (6) are slidably mounted, a fixing sleeve (502) is symmetrically arranged outside the universal joint (501), a pin (503) is slidably mounted inside the fixing sleeve (502), one end of the pin (503) passes through the fixing sleeve (502) and is fixedly mounted with a handle (504), a limit plate (505) is fixedly connected outside the pin (503) and inside the fixing sleeve (502), a spring (506) is arranged on one side of the limit plate (505), and the spring (506) is sleeved outside the pin (503), and second key slots (507) are provided at both ends of the universal joint (501).

8. A magnesium alloy coated stent for treating limb fractures according to claim 7, characterized in that: One end of the mounting rod (6) is provided with a key block (16) in an equidistant annular shape, and the key block (16) is adapted to fit the second key groove (507).

9. A magnesium alloy coated stent for treating limb fractures according to claim 7, characterized in that: The outside of the installation rod (6) is symmetrically provided with positioning holes (17), and the other end of the insertion pin (503) is inserted into the inside of the installation rod (6) through the positioning hole (17).

10. A method for using the magnesium alloy coated stent for treating limb fractures according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: perform positioning drilling at the position where the fixing pin is required, insert a tool into the first keyway (104), rotate and install the bone screw (101) into the inside of the bone by drilling, and the bone screw (101) passes through the bone, and the steel ball (103) is located on the other side of the bone, and then insert one end of the connecting rod (2) provided with a cone block (3) into the inside of the bone screw (101), and the hexagonal groove (4) at the other end of the connecting rod (2) is connected to the tool, and the tool is rotated to drive the connecting rod (2) to rotate, so that the connecting rod (2) and the bone screw (101) are threadedly installed. Due to the setting of the cone block (3), the connecting rod (2) pushes part of the steel ball (103) out of the steel ball (103) through the limiting groove (102) during the installation process, thereby improving the stability of the installation of the bone screw (101); Step 2: After the installation of multiple connecting rods (2), loosen the second bolt (15) to release the fit between the clamping plate (12) and the second clamping member (9), place the second clamping member (9) outside the connecting rod (2), and then tighten the second bolt (15). Through the clamping of the clamping plate (12), the connecting rod (2) and the second clamping member (9) are fixed. Loosen the first bolt (11) so that the slider (8) can slide inside the slide groove (10), thereby changing the distance between the second clamping member (9) and the first clamping member (7). Similarly, fix another connecting rod (2) to the first clamping member (7), and then tighten the first bolt (11) to fix the second clamping member (9) to the first clamping member (7); Step 3, when the position of the connecting rod (2) is not flush, one end of the mounting rod (6) is inserted into the interior of the universal joint (501) through the cooperation of the key block (16) and the second key slot (507), and the two handles (504) are pulled toward both ends, the pin (503) slides, and the spring (506) is compressed. When the mounting rod (6) is inserted into the innermost part of the universal joint (501), the handle (504) is slowly loosened. Due to the reset effect of the spring (506), the pin (503) moves, and one end of the pin (503) is inserted into the interior of the mounting rod (6) through the positioning hole (17), thereby fixing the mounting rod (6) and the universal joint (501). The other end of the universal joint (501) is installed in the same manner. Through the setting of the universal joint (501), the first clamping members (7) at both ends can be universally adjusted, which is convenient for fixing the uneven connecting rod (2) and greatly improves the adaptability. Step 4: When the patient's bone heals and the support needs to be removed, first loosen the second bolt (15) so that the connecting rod (2) can be separated from the second clamp (9) and the first clamp (7), and then use a tool to connect it to the hexagonal slot (4). The tool is rotated in the opposite direction to rotate the connecting rod (2) in the opposite direction. The connecting rod (2) and the bone screw (101) are separated and taken out. Since the parts of the fixing mechanism (1) are all magnesium alloys, they can be degraded inside the human body and are harmless to the body, so there is no need to take them out.

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