Long tubular bone shortening osteotomy guide plate reduction integrated device

Abstract

The invention relates to the technical field of shortening osteotomy, in particular to a long tubular bone shortening osteotomy guide plate reduction integrated device which comprises an arc-shaped protection plate and a connecting strip connected to one end of the arc-shaped protection plate through a shaft. The magnetic attraction structure comprises a sliding block arranged at the lower end of the sliding piece and a positioning block arranged at the lower end of the positioning piece, the sliding piece and the positioning piece are connected through a pulling mechanism, the pulling mechanism is further connected with a driven piece and a fixed piece, and the sliding piece and the positioning piece are arranged in one-to-one correspondence with the driven piece and the fixed piece respectively. According to the invention, not only can the saw blade of the swing saw be prevented from cutting soft tissues around bones, but also the saw blade of the swing saw can be ensured not to deviate in the osteotomy process, and in addition, the length of the cut bones can be intuitively seen. Meanwhile, when the two sections of osteotomy broken ends are close to each other, the two broken ends can be prevented from rotating or angulating and staggering, and then stable butt joint of the osteotomy surfaces at the far end and the near end of the two sections is facilitated.

Description

Technical Field

[0001] This invention relates to the field of shortening osteotomy technology, specifically to an integrated device for repositioning a shortening osteotomy guide plate for long tubular bones. Background Technology

[0002] Long tubular bones, including the femur and ulna, can have abnormal lengths that affect normal limb function. For example, an excessively long ulna often leads to abnormal impact between the distal ulna and the triquetrum, causing wrist injuries. Unequal leg lengths can cause prolonged gait abnormalities, leading to serious consequences such as pelvic tilt, hip dysplasia, and scoliosis. These conditions typically require shortening osteotomy to treat the excessively long bones. Currently, surgeons generally use a freehand oscillating saw to cut the bone, then reposition the fracture ends and fix them internally with plates and screws. However, this process is difficult to control precisely in terms of osteotomy length due to the violent sliding of the oscillating saw, which can damage surrounding blood vessels and muscles. It also easily results in uneven osteotomy surfaces and poor alignment of the fracture ends, leading to poor surgical outcomes. Furthermore, because the bone surface is smooth, conventional surgical tools such as forceps and bone clamps are difficult to hold firmly, making it difficult to maintain fracture stability and affecting subsequent strong internal fixation. Publication number CN114176711A discloses a distal ulnar osteotomy correction technique. Surgical guide systems are limited in their applicability because the length of osteotomy can only be cut by the size of the short and long osteotomy grooves. To address this issue, CN222870618U discloses a surgical guide system for ulnar osteotomy. This system, which includes an osteotomy guide plate and a connecting plate, works in conjunction with the ulnar plate to adjust the required osteotomy length according to the actual situation, thus broadening its applicability. Furthermore, the system features a reduction forceps with a kidney-shaped hole structure, which provides clearance for the linear movement trajectory of the osteotomy, preventing problems such as poor accuracy in osteotomy and surface connection caused by curved movements. However, the existing technology mentioned above cannot prevent the saw blade from cutting the blood vessels, muscles and other soft tissues around the bone during use. In addition, it is not easy to ensure the stable connection of the osteotomy section. Therefore, an integrated device for repositioning a long tubular bone shortening osteotomy guide plate is needed to solve the above problems. Summary of the Invention

[0003] The purpose of this invention is to provide an integrated device for repositioning a shortened osteotomy guide plate for long tubular bones, in order to solve the problems mentioned in the background art that existing surgical guide plates for osteotomy of long tubular bones cannot prevent the saw blade from cutting the tissues around the bone, and are not convenient to ensure stable connection of the osteotomy cut surfaces after the cut.

[0004] To achieve the above objectives, the present invention provides the following technical solution: An integrated device for repositioning a shortened osteotomy guide plate for long tubular bones includes an arc-shaped protective plate and a connecting strip axially connected to one end of the plate. A sliding plate and a positioning plate are connected to the connecting strip via a magnetic attraction structure. The magnetic attraction structure includes a slider located at the lower end of the sliding plate and a positioning block located at the lower end of the positioning plate. The sliding plate and the positioning plate are connected by a pulling mechanism, which is also connected to a driven plate and a fixed plate. The sliding plate and the positioning plate are respectively arranged in a one-to-one correspondence with the driven plate and the fixed plate. Each of the driven plate, sliding plate, positioning plate, and fixed plate has a positioning hole penetrating both sides. An arc-shaped positioning strip is engaged and fixedly connected between the driven plate and the sliding plate, and between the positioning plate and the fixed plate. The positioning strip has a strip-shaped hole for a saw blade to pass through. A limiting mechanism for limiting the movement of the driven plate and the sliding plate is installed on the pulling mechanism.

[0005] Preferably, the side of the connecting strip is engraved with a scale bar, and the sliding piece is provided with scale marks that correspond to the scale bar.

[0006] Preferably, the magnetic attraction structure further includes a positioning groove and a sliding groove disposed on the surface of the connecting strip, wherein the positioning groove is magnetically engaged and fixedly connected with the positioning block, and the sliding groove is magnetically engaged and slidably connected with the slider.

[0007] Preferably, the pulling mechanism includes L-shaped support plates provided on both the positioning plate and the fixing plate, and the upper outer side of each support plate is connected to a transmission plate by a protrusion bearing, and the upper ends of the two transmission plates are connected by an n-shaped grip-type lever.

[0008] Preferably, the pulling mechanism further includes a support plate connected to the lower end of each of the two transmission plates. The two support plates extend movably into the interior of the lower end of the corresponding transmission plates, and each support plate is axially connected to one end of a connecting plate. The driven plate and the sliding plate are respectively fixedly connected to the other end of the corresponding connecting plate.

[0009] Preferably, the transmission plate is in the shape of a broken line, and the distance between its lower end and its rotation center is less than the distance between its upper end and its rotation center.

[0010] Preferably, the two ends of the grip-type lever are plate-like structures, and the plate-like structures at both ends of the grip-type lever respectively extend into the inner side of the upper end of the corresponding transmission plate.

[0011] Preferably, a torsion spring for resetting the transmission plate is also provided between the protrusion on the outer side of the upper end of the transmission plate and the corresponding support plate.

[0012] Preferably, the limiting mechanism includes an L-shaped limiting piece disposed on the outer side of each support piece, and the limiting piece extends to the outer side of the lower end of the corresponding transmission plate. The outer side of the lower end of the transmission plate is connected to the inner side of the corresponding limiting piece by a limiting sub-tooth and a limiting female tooth.

[0013] Preferably, the limiting sub-teeth and limiting female teeth are equally spaced on the inner side of the limiting plate and the outer side of the lower end of the transmission plate, and the limiting plate is made of elastic metal. The limiting sub-teeth and limiting female teeth are both right-angled teeth, which are used to enable the limiting plate and the corresponding transmission plate to move closer to each other in only one direction.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the integrated device for repositioning the long tubular bone shortening osteotomy guide plate not only avoids the saw blade of the oscillating saw from cutting the soft tissue around the bone, but also ensures that the position of the oscillating saw blade does not shift during the osteotomy process. In addition, it can visually show the length of bone removed. At the same time, when the two osteotomy ends come together, it can prevent the ends from rotating or angularly misaligning, thereby helping to stabilize the connection of the two proximal and distal osteotomy surfaces. 1. By passing through the lower part of the ulna or femur through the arc-shaped protective plate, the bone can be temporarily isolated from the surrounding soft tissue. When using the oscillating saw for osteotomy, the saw blade can only contact the arc-shaped protective plate and cannot contact the soft tissue isolated by the arc-shaped protective plate, thus protecting the soft tissue. 2. When using an oscillating saw to cut the ulna or femur, the saw blade can pass through the slotted hole on the positioning strip, thereby limiting the saw blade through the slotted hole to prevent the saw blade from shaking, ensuring a flat cut surface, which is beneficial for the subsequent joining of the two ends. In addition, since the positioning strip is a detachable structure, it will not affect the subsequent installation of the bone plate. 3. The sliding plate can slide on the connecting strip through the groove and the slider. With the help of the scale bar and the scale marks set on the sliding plate, the length of bone to be cut can be seen intuitively, avoiding the problem of difficulty in controlling the length of bone cut in the past. 4. The Kirschner wires pass through four positioning holes, which can fix the proximal and distal ends of the bone. This not only ensures that the bone will not move during the osteotomy stage, but also ensures that the osteotomy surfaces at both ends are stably connected during the subsequent docking stage. In addition, the engagement of the limiting male and female teeth ensures that the position of the cross-section after docking does not change, so as to facilitate the subsequent installation of the steel plate. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the separate structure of the connecting strip and the positioning piece of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram of point A in the middle; Figure 4 This is a schematic diagram of the structure of the present invention from a bottom view; Figure 5 This is a partial cross-sectional view of the present invention; Figure 6 For the present invention Figure 5Enlarged structural diagram of point B; Figure 7 This is a schematic cross-sectional view of the connection between the transmission plate and the support plate of the present invention; Figure 8 For the present invention Figure 7 A magnified structural diagram of point C.

[0016] In the diagram: 1. Arc-shaped protective plate; 2. Connecting strip; 3. Support plate; 4. Transmission plate; 5. Torsion spring; 6. Grip lever; 7. Support plate; 8. Scale strip; 9. Driven plate; 10. Sliding plate; 11. Limiting plate; 12. Positioning strip; 13. Fixing plate; 14. Positioning plate; 15. Positioning block; 16. Slider; 17. Positioning groove; 18. Slide groove; 19. Connecting plate; 20. Positioning hole; 21. Limiting female tooth; 22. Limiting female tooth. Detailed Implementation

[0017] 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.

[0018] Please see Figures 1-8 The present invention provides the following technical solution: Example 1: To address the problems of previous ulnar osteotomy surgical guides failing to prevent the saw blade from cutting muscle tissue and failing to ensure a smooth cut, the following technical solution is provided: a long tubular bone shortening osteotomy guide repositioning integrated device, comprising an arc-shaped protective plate 1 and a connecting strip 2 axially connected to one end of the plate. A sliding piece 10 and a positioning piece 14 are magnetically connected to the connecting strip 2. The sliding piece 10 and the positioning piece 14 are connected by a pulling mechanism, which is further connected to a driven piece 9 and a fixing piece 13. The sliding plate 10 and the positioning plate 14 are respectively provided in a one-to-one correspondence with the driven plate 9 and the fixed plate 13. The driven plate 9, the sliding plate 10, the positioning plate 14 and the fixed plate 13 are all provided with positioning holes 20 that pass through both sides. The driven plate 9 and the sliding plate 10 and the positioning plate 14 and the fixed plate 13 are all connected by an arc-shaped positioning strip 12. The positioning strip 12 is provided with a strip-shaped hole for the saw blade to pass through. The side of the connecting strip 2 is engraved with a scale strip 8, and the sliding plate 10 is provided with a scale mark that corresponds to the scale strip 8.

[0019] The magnetic attraction structure includes a slider 16 disposed at the lower end of the sliding piece 10 and a positioning block 15 disposed at the lower end of the positioning piece 14. The magnetic attraction structure also includes a positioning groove 17 and a sliding groove 18 disposed on the surface of the connecting strip 2. The positioning groove 17 is magnetically engaged and fixedly connected with the positioning block 15, and the sliding groove 18 is magnetically engaged and slidably connected with the slider 16.

[0020] according to Figures 1-3 The ulna and muscle tissue at the surgical site are temporarily separated by passing through the arc-shaped protective plate 1 through the lower part of the ulna. Then the positioning block 15 is magnetically attached and fixed to the positioning groove 17. During the process, slider 16 is slidably engaged within slide groove 18; The distance the slider 10 moves can be seen intuitively by sliding the slider 16 within the groove 18 and by comparing the scale marks on the slider 10 with the scale bar 8 on the side of the connecting bar 2. The pulling mechanism includes L-shaped support plates 3 on both the positioning plate 14 and the fixing plate 13. The upper outer side of each support plate 3 is connected to a transmission plate 4 via a protrusion. The upper ends of the two transmission plates 4 are connected by an n-shaped grip-type actuating rod 6. The pulling mechanism also includes support plates 7 connected to the lower ends of the two transmission plates 4. The two support plates 7 extend movably into the interior of the lower end of the corresponding transmission plate 4. One end of a connecting plate 19 is axially connected to each support plate 7. The driven plate 9 and the sliding plate 10 are fixedly connected to the other end of the corresponding connecting plate 19. The transmission plate 4 is zigzag-shaped, and the distance between its lower end and its rotation center is less than the distance between its upper end and its rotation center. The two ends of the grip-type actuating rod 6 are plate-like structures, and the plate-like structures at both ends of the grip-type actuating rod 6 extend movably into the inner side of the upper end of the corresponding transmission plate 4. A torsion spring 5 for resetting the transmission plate 4 is also provided between the protrusion on the upper outer side of the transmission plate 4 and the corresponding support plate 3.

[0021] according to Figures 4-6 Then, after magnetically connecting the positioning block 15 and the slider 16 to the positioning groove 17 and the sliding groove 18 respectively, insert the four Kirschner wires through the four positioning holes 20 respectively, and drive the four Kirschner wires into the ulna. At this time, the driven piece 9, the sliding piece 10, the fixing piece 13 and the positioning piece 14 will be fixedly connected to the ulna. Then, the two positioning strips 12 are respectively engaged and fixed between the driven piece 9 and the sliding piece 10, and between the fixed piece 13 and the positioning piece 14; Before cutting the ulna, the hand-held lever 6 can be used to rotate the transmission plate 4, thereby driving the slider 16 to move within the groove 18, so as to adjust the position of the driven piece 9 and the sliding piece 10 (to control the length of the ulna cut by the saw blade). During the process, the position of the positioning strip 12 between the driven piece 9 and the sliding piece 10 is limited by the meshing of the limiting tooth 21 and the limiting tooth 22. When cutting the ulna, the saw blade of the oscillating saw passes through the strip hole on the positioning strip 12 and then cuts the ulna. The positioning strip 12 and the strip hole on it limit the saw blade from shaking, ensuring the stability of the cut and making the cut surface a flat plane. After the cutting is completed, use tweezers to pick up the cut ulna and take it out. Then, hold the lever 6 to rotate the transmission plate 4, so that the ulna part between the driven plate 9 and the sliding plate 10 moves closer to the other ulna, thereby gradually completing the docking. After docking, the positioning strip 12 is removed, and the steel plate is attached to the surface of the two ulnae. Then, bone screws are used for fixation, thus completing the shortening osteotomy.

[0022] Example 2: To solve the problem in Example 1 where the position of the two ulna segments cannot be guaranteed to be stable when they are joined, the following technical solution is provided: Specifically, a limiting mechanism for limiting the driven piece 9 and the sliding piece 10 is installed on the pulling mechanism.

[0023] The limiting mechanism includes an L-shaped limiting piece 11 provided on the outer side of each support piece 7, and the limiting piece 11 extends to the outer side of the lower end of the corresponding transmission plate 4. The outer side of the lower end of the transmission plate 4 is connected to the inner side of the corresponding limiting piece 11 by limiting sub-teeth 21 and limiting nut 22. The limiting sub-teeth 21 and limiting nut 22 are equally spaced on the inner side of the limiting piece 11 and the outer side of the lower end of the transmission plate 4, respectively. The limiting piece 11 is made of elastic metal material, and the limiting sub-teeth 21 and limiting nut 22 are both right-angle teeth, which are used to ensure that the limiting piece 11 and the corresponding transmission plate 4 can only move closer to each other in one direction.

[0024] according to Figures 7-8 When the slider 16 moves in the groove 18, that is, when the sliding piece 10 moves, the support piece 7 will gradually extend into the corresponding transmission plate 4, thereby causing the support piece 7 to move outside the corresponding transmission plate 4. During the process, the limiting male tooth 21 and the limiting female tooth 22 gradually mesh in sequence, thereby limiting the position of the transmission plate 4 and the support plate 7, so that the position of the two ulna segments does not change when they are joined, which is conducive to the subsequent installation of the steel plate.

[0025] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An integrated device for repositioning a shortened osteotomy guide plate for long tubular bones, comprising an arc-shaped protective plate (1) and a connecting strip (2) axially connected to one end thereof, characterized in that: The connecting strip (2) is connected to a sliding piece (10) and a positioning piece (14) by a magnetic attraction structure. The magnetic attraction structure includes a slider (16) located at the lower end of the sliding piece (10) and a positioning block (15) located at the lower end of the positioning piece (14). The sliding piece (10) and the positioning piece (14) are connected by a pulling mechanism, and the pulling mechanism is also connected to a driven piece (9) and a fixed piece (13). The sliding piece (10) and the positioning piece (14) are respectively connected to the driven piece (9) and the fixed piece (13). Correspondingly, the driven plate (9), sliding plate (10), positioning plate (14) and fixed plate (13) are all provided with positioning holes (20) that pass through both sides. The driven plate (9) and sliding plate (10) and the positioning plate (14) and fixed plate (13) are all connected by an arc-shaped positioning strip (12) that engages and fixes them. The positioning strip (12) is provided with a strip-shaped hole for the saw blade to pass through. The pulling mechanism is equipped with a limiting mechanism for limiting the driven plate (9) and sliding plate (10).

2. The integrated device for repositioning a shortened osteotomy guide plate for long tubular bones according to claim 1, characterized in that: The side of the connecting strip (2) is engraved with a scale strip (8), and the sliding piece (10) is provided with scale marks that correspond to the scale strip (8).

3. The integrated device for repositioning a shortened osteotomy guide plate for long tubular bones according to claim 2, characterized in that: The magnetic structure also includes a positioning groove (17) and a sliding groove (18) disposed on the surface of the connecting strip (2), wherein the positioning groove (17) is magnetically engaged and fixedly connected with the positioning block (15), and the sliding groove (18) is magnetically engaged and slidably connected with the slider (16).

4. The integrated device for repositioning a shortened osteotomy guide plate for long tubular bones according to claim 3, characterized in that: The pulling mechanism includes L-shaped support plates (3) provided on both the positioning plate (14) and the fixing plate (13), and the upper outer side of each support plate (3) is connected to a transmission plate (4) by a protrusion bearing. The upper ends of the two transmission plates (4) are connected by an n-shaped grip lever (6).

5. The integrated device for repositioning a shortened osteotomy guide plate for long tubular bones according to claim 4, characterized in that: The pulling mechanism also includes support plates (7) connected to the lower ends of the two transmission plates (4). The two support plates (7) extend into the interior of the lower end of the corresponding transmission plates (4), and each support plate (7) is axially connected to one end of a connecting plate (19). The driven plate (9) and the sliding plate (10) are respectively fixedly connected to the other end of the corresponding connecting plate (19).

6. The integrated device for repositioning a shortened osteotomy guide plate for long tubular bones according to claim 5, characterized in that: The transmission plate (4) is in the shape of a broken line, and the distance between its lower end and its rotation center is less than the distance between its upper end and its rotation center.

7. The integrated device for repositioning a shortened osteotomy guide plate for long tubular bones according to claim 6, characterized in that: The two ends of the grip-type lever (6) are plate-like structures, and the plate-like structures at both ends of the grip-type lever (6) extend into the inner side of the upper end of the corresponding transmission plate (4).

8. The integrated device for repositioning a shortened osteotomy guide plate for long tubular bones according to claim 7, characterized in that: A torsion spring (5) for resetting the transmission plate (4) is also provided between the protrusion on the outer side of the upper end of the transmission plate (4) and the corresponding support plate (3).

9. The integrated device for repositioning a shortened osteotomy guide plate for long tubular bones according to claim 8, characterized in that: The limiting mechanism includes an L-shaped limiting piece (11) provided on the outside of each support piece (7), and the limiting piece (11) extends to the lower outer side of the corresponding transmission plate (4). The lower outer side of the transmission plate (4) is connected to the inner side of the corresponding limiting piece (11) through a limiting sub-tooth (21) and a limiting female tooth (22).

10. The integrated device for repositioning a shortened osteotomy guide plate for long tubular bones according to claim 9, characterized in that: The limiting sub-tooth (21) and limiting female tooth (22) are equally spaced on the inner side of the limiting plate (11) and the outer side of the lower end of the transmission plate (4), respectively. The limiting plate (11) is made of elastic metal material. The limiting sub-tooth (21) and limiting female tooth (22) are both right-angle teeth, which are used to make the limiting plate (11) and the corresponding transmission plate (4) move closer to each other in only one direction.

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