Pediatric elastic intramedullary nail

Abstract

This invention provides a pediatric flexible intramedullary nail, belonging to the field of medical device technology. The pediatric flexible intramedullary nail provided by this invention includes a linear nail portion, a fixation plate, and fixation screws. The fixation plate is located at the lower end of the linear nail portion, and two sets of fixation screws are mounted on the fixation plate, penetrating the fixation plate from its left side wall. An implantation segment is provided at the upper end of the linear nail portion away from the fixation plate, and an implantation guide surface is provided on the side wall of the implantation segment. The cross-sectional area of ​​the implantation segment is smaller than that of the linear nail portion. This pediatric flexible intramedullary nail, with its fixation plate and two sets of fixation screws, effectively improves fixation stability, facilitates surgical operation, reduces incision notches, minimizes foreign body discomfort, and the implantation guide surface facilitates the implantation of the flexible intramedullary nail.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a pediatric elastic intramedullary nail. Background Technology

[0002] Flexible intramedullary nails are commonly used to treat long bone fractures in children. They promote healing by providing internal fixation and stable support. When implanted, the nails are typically arranged in a cross-hatched pattern, with two sets of nails forming an "X" shape within the medullary cavity. The ends and apexes of the nails contact the medullary cavity, where they generate pressure and thrust, providing internal support to the fracture site. This three-point fixation ensures proper alignment of the fracture ends, preventing displacement and misalignment, thus providing the fracture ends with resistance to bending, rotation, and axial and lateral stability. Furthermore, the elastic properties of the nails absorb impact and vibration, reducing pressure on the fracture site, avoiding stress shielding, and not affecting stress transmission to the fracture ends. This helps reduce damage to local tissues and lowers the risk of complications during fracture healing. Compared to open reduction and internal fixation, it causes less tissue damage, does not strip the periosteum, and does not damage the epiphysis, promoting fracture healing and facilitating faster recovery. Traditional flexible intramedullary nails have weak resistance to rotational forces, which can lead to nail slippage, loosening, and dislodgement, resulting in insufficient fixation strength. Rotational wear of the nail can also cause bone instability, leading to complications such as skin irritation and sinus tracts. Adding a cap to the end of the nail creates static locking, but this fails to provide dynamic compression to the fracture ends for simple fractures. When used for long bone fractures in children, the tail end of the traditional flexible intramedullary nail can easily become embedded in the bone as the bone grows, making removal difficult. Utility Model Content

[0003] The purpose of this invention is to provide a pediatric elastic intramedullary nail, which aims to solve the problems of unstable fixation, easy occurrence of complications, and difficulty in removal as the patient grows.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a pediatric elastic intramedullary nail is provided, comprising a linear nail portion, a fixation plate, and fixation screws. The fixation plate is disposed at the lower end of the linear nail portion, and two sets of fixation screws are disposed on the fixation plate. The fixation screws penetrate the fixation plate from the left side wall of the fixation plate. An implantation segment is provided at the upper end of the linear nail portion away from the fixation plate. An implantation guide surface is provided on the side wall of the implantation segment. The cross-sectional area of ​​the implantation segment is smaller than the cross-sectional area of ​​the linear nail portion.

[0005] In one possible implementation, a linear pin portion, a fixing plate, and fixing screws are provided. The fixing plate is disposed at the lower end of the linear pin portion, and two sets of fixing screws are disposed on the fixing plate. The fixing screws penetrate the fixing plate from the left side wall of the fixing plate. An implantation section is provided at the upper end of the linear pin portion away from the fixing plate. An implantation guide surface is provided on the side wall of the implantation section. The cross-sectional area of ​​the implantation section is smaller than the cross-sectional area of ​​the linear pin portion.

[0006] In one possible implementation, the implanted segment extends along the length direction of the linear staple portion.

[0007] In one possible implementation, the implant segment is arc-shaped, curving toward the right / left side of the linear staple portion.

[0008] In one possible implementation, the implantation guide surface is disposed on the front side of the implantation segment.

[0009] In one possible implementation, the upper end of the linear staple is provided with a transition surface, which connects to the implantation guide surface.

[0010] In one possible implementation, the fixing screw is set at an angle to the first sidewall of the fixing plate, and the tail end of the fixing screw is set upward.

[0011] In one possible implementation, the two sets of fixing screws are distributed vertically.

[0012] In one possible implementation, the two sets of fixing screws are distributed in a cross pattern.

[0013] In one possible implementation, the fixing plate has a frustum transition portion at one end near the linear nail portion.

[0014] The beneficial effects of the pediatric elastic intramedullary nail provided by this utility model are as follows:

[0015] Compared with existing technologies, this method features a linear nail section, a fixation plate, and fixation screws. The linear nail section is located at the upper end of the fixation plate, and two sets of fixation screws are provided. The fixation screws pass through the fixation plate to fix the fixation plate to the patient's bone. The linear nail section penetrates into the patient's medullary cavity. An implantation segment is provided at the upper end of the linear nail section, and an implantation guide surface is provided on the side wall of the implantation segment. The cross-sectional area of ​​the implantation segment is smaller than that of the linear nail section, which facilitates the implantation of the elastic intramedullary nail. The two sets of fixation screws effectively improve the stability of fixation and facilitate surgical operation. The fixation plate helps to reduce the notch and reduce the discomfort of foreign bodies. The implantation guide surface facilitates the implantation of the elastic intramedullary nail. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A three-dimensional structural schematic diagram of Embodiment 1 of the pediatric elastic intramedullary nail provided in this utility model embodiment;

[0018] Figure 2 A schematic diagram of the left side of the pediatric elastic intramedullary nail embodiment 1 provided by this utility model;

[0019] Figure 3 A three-dimensional structural schematic diagram of Embodiment 2 of the pediatric elastic intramedullary nail provided in this utility model embodiment;

[0020] Figure 4 A schematic diagram of the left side of the pediatric elastic intramedullary nail embodiment 2 provided by this utility model;

[0021] Figure 5 A three-dimensional structural schematic diagram of Embodiment 3 of the pediatric elastic intramedullary nail provided in this utility model embodiment;

[0022] Figure 6 This is a schematic diagram of the left side of the pediatric elastic intramedullary nail embodiment 3 provided by this utility model.

[0023] In the diagram: 1. Fixing plate; 2. Second screw; 3. First screw; 4. Transition wedge; 5. Frustum transition section; 6. Folded line section; 7. Linear nail section; 8. Transition surface; 9. Implantation section; 10. Implantation guide surface. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] Please refer to Figures 1 to 6The present invention provides a specific embodiment of a pediatric elastic intramedullary nail, comprising a linear nail portion 7, a fixing plate 1, and fixing screws. The fixing plate 1 is disposed at the lower end of the linear nail portion 7, and two sets of fixing screws are disposed on the fixing plate 1. The fixing screws penetrate the fixing plate 1 from the left side wall of the fixing plate 1. An implantation segment 9 is disposed at the upper end of the linear nail portion 7 away from the fixing plate 1. An implantation guide surface 10 is disposed on the side wall of the implantation segment 9. The cross-sectional area of ​​the implantation segment 9 is smaller than the cross-sectional area of ​​the linear nail portion 7.

[0026] This utility model provides a pediatric flexible intramedullary nail, which, compared with the prior art, is provided with a linear nail part 7, a fixation plate 1, and fixation screws. The linear nail part 7 is located at the upper end of the fixation plate 1. Two sets of fixation screws are provided, which pass through the fixation plate 1 to fix the fixation plate 1 to the patient's bone. The linear nail part 7 is inserted into the patient's medullary cavity. An implantation segment 9 is provided at the upper end of the linear nail part 7. An implantation guide surface 10 is provided on the side wall of the implantation segment 9. The cross-sectional area of ​​the implantation segment 9 is smaller than that of the linear nail part 7, which facilitates the implantation of the flexible intramedullary nail. The two sets of fixation screws effectively improve the stability of fixation and facilitate surgical operation. The fixation plate 1 helps to reduce the notch and reduce the discomfort of foreign bodies. The implantation guide surface 10 is provided to facilitate the implantation of the flexible intramedullary nail.

[0027] For details, please refer to Figures 1 to 6 The device includes a linear nail section 7, a fixation plate 1, and fixation screws. The linear nail section 7 is positioned above the fixation plate 1. The side of the fixation plate 1 closest to the bone surface is designated as the left side, and the side of the fixation plate 1 furthest from the bone surface is designated as the right side. The plane on which the fixation plate 1 is located is a plane in the anterior-posterior direction. The fixation plate 1 is positioned at the lower end of the linear nail section 7. Before implantation into the patient, the linear nail section 7 needs to be pre-bent to meet the patient's usage requirements. The left and right sides of the fixation plate 1 are flat, which helps to improve the stability of the device fixation, reduce notches, and reduce discomfort caused by foreign bodies. Screw holes are provided on the fixation plate 1, and fixation screws pass through the screw holes from right to left. The nail section of the fixation screw penetrates into the patient's bone. There are two sets of screw holes and fixation screws, which helps to improve the stability of the device fixation. An implantation segment 9 is positioned at the upper end of the linear nail section 7, and an implantation guide surface 10 is positioned on the implantation guide surface 10. In the horizontal direction, the cross-sectional area of ​​the implantation segment 9 is smaller than the cross-sectional area of ​​the linear nail section 7. The implantation segment 9 and the implantation guide surface 10 facilitate the implantation of the elastic intramedullary nail.

[0028] As a specific embodiment of the pediatric elastic intramedullary nail provided by this utility model, please refer to Figures 3 to 6The linear nail portion 7 is provided with a zigzag portion 6 at one end near the fixing plate 1. The zigzag portion 6 is arranged along the length direction of the fixing plate 1. The linear nail portion 7 and the zigzag portion 6 are arranged at an obtuse angle. The linear nail portion 7 is inclined to the right side of the zigzag portion 6.

[0029] For details, please refer to Figures 3 to 6 The zigzag section 6 connects the linear nail section 7 and the fixing plate 1. The lower end of the zigzag section 6 is set on the center line of the fixing plate 1 and is set along the length direction of the fixing plate 1. The upper end of the zigzag section 6 connects to the lower end of the linear nail section 7. There is an angle between the linear nail section 7 and the zigzag section 6. The linear nail section 7 is offset to the right of the extension line of the zigzag section 6. The angle between the linear nail section 7 and the zigzag section 6 is an obtuse angle, which facilitates the device to be supported in the patient's medullary cavity.

[0030] As a specific embodiment of the pediatric elastic intramedullary nail provided by this utility model, please refer to Figure 1 as well as Figure 2 The implanted segment 9 extends along the length direction of the linear nail portion 7.

[0031] For details, please refer to Figure 1 as well as Figure 2 The implanted segment 9 is straight and is located above the linear nail part 7. It is set along the length direction of the linear nail part 7. The linear nail part 7 and the implanted segment 9 are on the same straight line. After the linear nail part 7 is pre-bent, it is convenient for the device to be supported in the patient's medullary cavity.

[0032] As a specific embodiment of the pediatric elastic intramedullary nail provided by this utility model, please refer to Figures 3 to 6 The implanted segment 9 is arc-shaped and bends toward the right / left side of the linear nail portion 7.

[0033] For details, please refer to Figures 3 to 6 The implanted segment 9 is arc-shaped with a curved curvature. The implanted segment 9 bends to the right side of the linear nail part 7, or the implanted segment 9 bends to the left side of the linear nail part 7, so as to facilitate the device to be supported in the patient's medullary cavity. The bending direction of the implanted segment 9 is selected according to the actual situation of the patient.

[0034] As a specific embodiment of the pediatric elastic intramedullary nail provided by this utility model, please refer to Figures 1 to 6 The implantation guide surface 10 is disposed on the front side of the implantation segment 9.

[0035] For details, please refer to Figures 1 to 6An implantation guide surface 10 is provided on the front side of the implantation segment 9. The implantation guide surface 10 is arranged along the length direction of the implantation segment 9. The implantation segment 9 is straight and the implantation guide surface 10 is arc-shaped. The implantation segment 9 is straight and the implantation guide surface 10 is arc-shaped, which facilitates the implantation of the device into the patient's medullary cavity.

[0036] As a specific embodiment of the pediatric elastic intramedullary nail provided by this utility model, please refer to Figures 1 to 6 The upper end of the linear nail part 7 is provided with a transition surface 8, which is connected to the implantation guide surface 10.

[0037] For details, please refer to Figures 1 to 6 The transition surface 8 is located at the upper end of the linear nail part 7. The transition surface 8 is connected to the implantation guide surface 10. The transition surface 8 is an arc surface, which is used to transition between the linear nail part 7 and the implantation segment 9, thereby increasing the stability of the device.

[0038] As a specific embodiment of the pediatric elastic intramedullary nail provided by this utility model, please refer to Figures 1 to 6 The fixing screw is set at an angle to the first side wall of the fixing plate 1, and the tail end of the fixing screw is inclined upward.

[0039] For details, please refer to Figures 1 to 6 The fixing screw has an angle with the fixing plate 1, and the angle between the fixing screw and the fixing plate 1 is not equal to 90 degrees. Relative to the fixing plate 1, the tail end of the fixing screw extends towards the upper left side of the fixing plate 1, which helps to enhance the stability of fixing the fixing plate 1.

[0040] As a specific embodiment of the pediatric elastic intramedullary nail provided by this utility model, please refer to Figures 1 to 6 The two sets of fixing screws are distributed vertically.

[0041] For details, please refer to Figures 1 to 6 The two sets of screws are the first screw 3 and the second screw 2, and the two sets of screw holes are the first screw hole and the second screw hole. The first screw 3 is located above the second screw 2 on the right side wall of the fixing plate 1. The right end of the first screw hole and the right end of the second screw hole are located on the center line of the right side wall of the fixing plate 1, which increases the stability of the fixing.

[0042] As a specific embodiment of the pediatric elastic intramedullary nail provided by this utility model, please refer to Figures 1 to 6 The two sets of fixing screws are distributed in a cross pattern.

[0043] For details, please refer to Figures 1 to 6 The first screw 3 and the second screw 2 are arranged in a cross configuration, with the left end of the first screw 3 tilted towards the rear and the left end of the second screw 2 tilted towards the front, to increase the stability of the fixation.

[0044] As a specific embodiment of the pediatric elastic intramedullary nail provided by this utility model, please refer to Figures 1 to 6 The fixing plate 1 has a frustum transition portion 5 at one end near the linear nail portion 7.

[0045] For details, please refer to Figures 1 to 6 A frustum transition section 5 is disposed on the upper end of the fixed plate 1. The upper end of the frustum transition section 5 is connected to the lower end of the linear nail section 7. The frustum transition section 5 is used for the transition between the fixed plate 1 and the linear nail section 7. The frustum transition section 5 is frustum-shaped. A transition wedge 4 is provided at the lower end of the frustum transition section 5. Two sets of transition wedges 4 are provided, located on the left and right sides of the upper end of the fixed plate 1, respectively. The upper edge of the transition wedge 4 is connected to the edge of the lower end face of the frustum transition section 5, and the lower end of the transition wedge 4 is connected to the side wall of the fixed plate 1, thereby enhancing the stability of the device.

[0046] Please refer to Figure 1 as well as Figure 2 As in Embodiment 1 provided in this application, the implantation segment 9, the linear nail portion 7, the frustum transition portion 5, and the fixing plate 1 are arranged sequentially from top to bottom. The implantation segment 9 is linear. The implantation segment 9, the linear nail portion 7, and the fixing plate 1 are all arranged vertically. The frustum transition portion 5 is arranged vertically at the upper end of the fixing plate 1. The linear nail portion 7 is arranged vertically at the upper end of the frustum transition portion 5. The implantation segment 9 is arranged vertically at the upper end of the linear nail portion 7. In this embodiment, the implantation segment 9 and the folded line portion 6 are both located on the extension line of the linear nail portion 7.

[0047] Please refer to Figure 3 as well as Figure 4 As in Embodiment 2 provided in this application, the implantation segment 9, the linear nail portion 7, the folded line portion 6, the frustum transition portion 5, and the fixing plate 1 are arranged sequentially from top to bottom. The implantation segment 9 is arc-shaped. The frustum transition portion 5 is located at the upper end of the fixing plate 1. The folded line portion 6 is located at the upper end of the frustum transition portion 5. The folded line portion 6, the frustum transition portion 5, and the fixing plate 1 are arranged along the same straight line. The linear nail portion 7 is located at the upper end of the folded line portion 6. The linear nail portion 7 and the folded line portion 6 are arranged at an obtuse angle. The linear nail portion 7 is inclined to the right side of the folded line portion 6. The implantation segment 9 is vertically arranged at the upper end of the linear nail portion 7. The implantation segment 9 is bent to the right. In this embodiment, both the implantation segment 9 and the folded line portion 6 are located to the right of the linear nail portion 7.

[0048] Please refer to Figure 5 as well as Figure 6As in Embodiment 3 provided in this application, the implantation segment 9, the linear nail portion 7, the folded line portion 6, the frustum transition portion 5, and the fixing plate 1 are arranged sequentially from top to bottom. The implantation segment 9 is arc-shaped. The frustum transition portion 5 is located at the upper end of the fixing plate 1. The folded line portion 6 is located at the upper end of the frustum transition portion 5. The folded line portion 6, the frustum transition portion 5, and the fixing plate 1 are arranged along the same straight line. The linear nail portion 7 is located at the upper end of the folded line portion 6. The linear nail portion 7 and the folded line portion 6 are arranged at an obtuse angle. The linear nail portion 7 is inclined to the right side of the folded line portion 6. The implantation segment 9 is vertically arranged at the upper end of the linear nail portion 7. The implantation segment 9 is bent to the left. In this embodiment, the implantation segment 9 is located to the left of the linear nail portion 7, and the folded line portion 6 is located to the right of the linear nail portion 7.

[0049] Please refer to Figures 1 to 6 During the surgery, two sets of elastic intramedullary nails need to be implanted into the patient's body. Different models of elastic intramedullary nails are selected according to the actual situation. Before implanting the elastic intramedullary nails into the patient's body, the linear nail portion 7 needs to be pre-bent. Two sets of elastic intramedullary nails can be implanted in Example 1, on both sides of the patient's bone. Two sets of elastic intramedullary nails can be implanted in Example 2, on both sides of the patient's bone. Two sets of elastic intramedullary nails can be implanted in Example 3, on both sides of the patient's bone. Alternatively, one set of elastic intramedullary nails in Example 2 and one set of elastic intramedullary nails in Example 3 can be implanted on the same side of the patient's bone. At this time, the implanted segments 9 of the two sets of elastic intramedullary nails abut against both sides of the patient's medullary cavity.

[0050] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pediatric elastic intramedullary nail, comprising: It includes a linear nail part, a fixing plate, and fixing screws. The fixing plate is located at the lower end of the linear nail part, and two sets of fixing screws are located on the fixing plate. The fixing screws penetrate the fixing plate from the left side wall of the fixing plate. An implantation section is provided at the upper end of the linear nail part away from the fixing plate. An implantation guide surface is provided on the side wall of the implantation section. The cross-sectional area of ​​the implantation section is smaller than the cross-sectional area of ​​the linear nail part.

2. A pediatric elastic intramedullary nail as in claim 1, wherein, The linear nail portion has a zigzag section at one end near the fixing plate. The zigzag section is arranged along the length direction of the fixing plate. The linear nail portion and the zigzag section are arranged at an obtuse angle. The linear nail portion is inclined to the right side of the zigzag section.

3. The pediatric elastic intramedullary nail of Claim 1, wherein, The implanted segment extends along the length of the linear staple.

4. The pediatric elastic intramedullary nail of Claim 1, wherein, The implanted segment is arc-shaped, curving toward the right / left side of the linear nail portion.

5. The pediatric elastic intramedullary nail of Claim 1, wherein, The implantation guide surface is located on the front side of the implantation segment.

6. A pediatric elastic intramedullary nail as in claim 1, wherein, The upper end of the linear nail portion is provided with a transition surface, which is connected to the implantation guide surface.

7. A pediatric elastic intramedullary nail as in claim 1, wherein, The fixing screw is set at an angle to the first side wall of the fixing plate, and the tail end of the fixing screw is inclined upward.

8. The pediatric elastic intramedullary nail of Claim 1, wherein, The two sets of fixing screws are distributed vertically.

9. The pediatric elastic intramedullary nail of Claim 1, wherein, The two sets of fixing screws are distributed in a crisscross pattern.

10. The pediatric elastic intramedullary nail of Claim 1, wherein, The fixing plate has a frustum transition section at one end near the linear nail.

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