Ultra-thin intramedullary nail plate locking system

Abstract

The present invention relates to the field of trauma orthopedics, and more specifically, to an ultra-fine medullary needle and plate locking system. The ultra-fine medullary needle and plate locking system includes an intramedullary needle, an extramedullary plate, and a plurality of locking screws; the intramedullary needle and the extramedullary plate are both arranged along the extension direction of the bone body, the intramedullary needle is accommodated in the medullary cavity of the bone body, and the extramedullary plate is located outside the bone body and is connected to one end of the intramedullary needle; the extramedullary plate is provided with a plurality of screw mounting holes along its extension direction; each locking screw is matched with a screw mounting hole and is connected to the bone body. The ultra-fine medullary needle and plate locking system can improve the stability of the bone body where the fracture occurs, thereby improving the fracture healing effect, and is conducive to the reduction and healing of the fracture; and after the fracture is healed, it can improve the efficiency of removal, thereby shortening the operation time.

Description

Technical Field

[0001] The present invention relates to the field of trauma orthopedics, and in particular to an ultra-fine medullary needle and steel plate locking system. Background Art

[0002] When severe comminuted fractures occur in tubular bones with thin medullary cavities (such as the human ulna, radius, fibula, clavicle, and bone segments in specific parts of animals), simple plate fixation cannot effectively fix all fracture fragments, resulting in unstable fixation and poor healing effect. Summary of the Invention

[0003] The objectives of the present invention include, for example, providing an ultra-fine medullary needle and plate locking system, which can improve the stability of the bone at the fracture site, thereby improving the fracture healing effect; and after the fracture heals, it can improve the efficiency of removal, thereby shortening the operation time.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] The present invention provides an ultra-fine intramedullary needle and steel plate locking system, which includes an intramedullary needle, an extramedullary steel plate, and a plurality of locking screws;

[0006] The intramedullary nail and the extramedullary steel plate are both arranged along the extension direction of the bone body. The intramedullary nail is accommodated in the medullary cavity of the bone body, and the extramedullary steel plate is located outside the bone body and connected to one end of the intramedullary nail.

[0007] The extramedullary steel plate is provided with a plurality of screw mounting holes along its extending direction; each locking screw is matched with a screw mounting hole and is connected to the bone body.

[0008] In an optional embodiment, one end of the intramedullary nail for connecting with the extramedullary steel plate is provided with a buckling portion; and one end of the extramedullary steel plate for connecting with the intramedullary nail is provided with a buckling hole buckled with the buckling portion.

[0009] In an optional embodiment, one end of the extramedullary steel plate for connection with the intramedullary nail is bent to form a bent portion, and the buckle hole is provided in the bent portion.

[0010] In an optional embodiment, an anti-drop screw hole is provided at one end of the intramedullary nail for connection with the extramedullary steel plate;

[0011] The ultra-fine intramedullary needle plate locking system also includes a limiting anti-slip screw, part of which is threadedly connected to the anti-slip screw hole, and the remaining part of the limiting anti-slip screw is accommodated in the buckling hole and is used to abut against the inner wall of the buckling hole and the buckling part to limit the movement of the extramedullary steel plate in the direction of detaching from the intramedullary needle.

[0012] In an optional embodiment, the buckle portion is provided with a buckle groove that matches the buckle hole, and the buckle groove and the anti-slip screw hole are located on opposite sides of the buckle portion.

[0013] In an optional embodiment, one end of the intramedullary nail for connecting with the extramedullary steel plate is provided with a mounting bevel, and the buckle portion and the anti-drop screw hole are both provided on the mounting bevel.

[0014] In an optional embodiment, the plurality of locking screws include at least one first locking screw and at least one second locking screw; the plurality of screw mounting holes include at least one first screw mounting hole and at least one second screw mounting hole;

[0015] The first locking screw is matched with the first screw mounting hole, and the portion of the first locking screw connected to the bone body is located on a side of the intramedullary nail close to the extramedullary steel plate;

[0016] The second locking screw is matched with the second screw mounting hole, and the end portion of the second locking screw connected to the bone body is located on the side of the intramedullary nail away from the extramedullary steel plate.

[0017] In an alternative embodiment, the length of the second locking screw is greater than the length of the first locking screw.

[0018] In an optional embodiment, the first screw mounting hole is located in an area of the extramedullary steel plate facing the intramedullary nail.

[0019] In an optional embodiment, along the extension direction of the bone body, the length of the extramedullary steel plate is greater than the length of the intramedullary nail; the extramedullary steel plate includes a first partition and a second partition, and the first partition is opposite to the intramedullary nail; the first screw mounting hole is opened in the first partition, and the second screw mounting hole is opened in the second partition.

[0020] The beneficial effects of the embodiments of the present invention include:

[0021] The ultra-fine medullary needle and plate locking system includes an intramedullary needle, an extramedullary steel plate and multiple locking screws; the intramedullary needle and the extramedullary steel plate are both arranged along the extension direction of the bone body, the intramedullary needle is accommodated in the medullary cavity of the bone body, and the extramedullary steel plate is located outside the bone body and connected to one end of the intramedullary needle; the extramedullary steel plate is provided with multiple screw mounting holes along its extension direction; each locking screw cooperates with a screw mounting hole and is connected to the bone body.

[0022] In summary, the ultra-fine medullary needle and plate locking system can select an intramedullary needle of appropriate diameter according to the diameter of the medullary cavity of different bone segments. It only requires opening the medullary cavity without expanding the medullary cavity. Moreover, through the connection of the extramedullary plate and the intramedullary needle and the fixation of the locking screw, the intramedullary needle and the extramedullary plate are connected into one and achieve a stable connection, thereby improving the stability of the bone at the fracture site, thereby improving the fracture healing effect, and facilitating the reduction and healing of the fracture. Moreover, after the fracture heals, when removing the steel plate and the intramedullary needle, only the anti-detachment screw needs to be removed, and the steel plate and the intramedullary needle can be separated and removed, thereby improving the efficiency of removal and shortening the operation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 Schematic diagram of the structure of the ultra-fine medullary needle and plate locking system in an embodiment of the present invention;

[0025] Figure 2 for Figure 1 A partial schematic diagram of the middle part;

[0026] Figure 3 2. It is a cross-sectional view of the ultra-fine medullary needle and plate locking system according to an embodiment of the present invention;

[0027] Figure 4 for Figure 3 Partial schematic diagram of point B in the middle;

[0028] Figure 5 Schematic diagram of the connection between the ultra-fine medullary needle and plate locking system and the ulna in an embodiment of the present invention.

[0029] Icons: 200-ultra-fine medullary needle and plate locking system; 100-ulna; 210-intramedullary needle; 220-extramedullary plate; 230-locking screw; 221-screw mounting hole; 211-snap-locking part; 222-snap-locking hole; 223-bending part; 212-anti-slip screw hole; 240-limited anti-slip screw; 213-snap-locking groove; 214-mounting bevel; 231-first locking screw; 232-second locking screw; 224-first screw mounting hole; 225-second screw mounting hole; 226-first partition; 227-second partition. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0033] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0035] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0036] Please refer to Figure 1-Figure 5 This embodiment provides an ultra-fine medullary needle and plate locking system 200, which includes an intramedullary needle 210, an extramedullary plate 220, and a plurality of locking screws 230;

[0037] The intramedullary needle 210 and the extramedullary steel plate 220 are both arranged along the extension direction of the bone body. The intramedullary needle 210 is accommodated in the medullary cavity of the bone body, and the extramedullary steel plate 220 is located outside the bone body and connected to one end of the intramedullary needle 210.

[0038] The extramedullary steel plate 220 is provided with a plurality of screw mounting holes 221 along its extending direction; each locking screw 230 is matched with a screw mounting hole 221 and connected to the bone body.

[0039] It should be noted that the ultra-fine medullary needle and plate locking system 200 can be used to treat fractures of tubular bones with thinner medullary cavities, such as the human ulna 100, radius, fibula, clavicle, and bone segments in specific parts of animals; and in this embodiment, the application of the ultra-fine medullary needle and plate locking system 200 to the fracture of the ulna 100 is used as an example for explanation.

[0040] Please refer to Figure 1-Figure 5 The working principle of the ultra-fine needle plate locking system 200 is:

[0041] The ultra-fine medullary pin and plate locking system 200 includes an intramedullary pin 210, an extramedullary plate 220, and a plurality of locking screws 230. Taking the ulna 100 as an example, the intramedullary pin 210 is selected to be compatible with the size of the medullary cavity of the ulna 100. When inserting the intramedullary pin 210 into the medullary cavity of the ulna 100, only the medullary cavity needs to be opened, without expanding the medullary cavity. Subsequently, the extramedullary plate 220 is connected to the intramedullary pin 210. When installing the extramedullary plate 220, a thin-walled steel plate is used for ease of shaping.

[0042] After the extramedullary steel plate 220 is connected to the intramedullary nail 210, multiple locking screws 230 are matched with the screw mounting holes 221 and are all connected to the bone body. Thus, through the connection of the extramedullary steel plate 220 and the intramedullary nail 210 and the fixation of the locking screws 230, the intramedullary nail 210 and the extramedullary steel plate 220 can be connected into one and achieve a stable connection, thereby improving the stability of the bone body where the fracture occurs, thereby improving the fracture healing effect, and facilitating the reduction and healing of the fracture; and after the fracture heals, when removing the steel plate and the intramedullary nail 210, only the anti-detachment screws need to be removed, and the steel plate and the intramedullary nail 210 can be separated and removed, thereby improving the efficiency of removal and shortening the operation time.

[0043] For further information, please refer to Figure 1-Figure 5 In this embodiment, when connecting the intramedullary needle 210 and the extramedullary steel plate 220, in order to facilitate the connection between the intramedullary needle 210 and the extramedullary steel plate 220 and facilitate the subsequent disassembly of the intramedullary needle 210 and the extramedullary steel plate 220, a snap-fit portion 211 is provided at one end of the intramedullary needle 210 for connection with the extramedullary steel plate 220; and a snap-fit hole 222 that snaps into engagement with the snap-fit portion 211 is provided at one end of the extramedullary steel plate 220 for connection with the intramedullary needle 210.

[0044] In this manner, the fastening portion 211 and the fastening hole 222 engage to achieve quick assembly and disassembly of the intramedullary needle 210 and the extramedullary steel plate 220. Furthermore, when the extramedullary steel plate 220 is disposed, the end of the extramedullary steel plate 220 that is intended for connection with the intramedullary needle 210 is bent to form a bent portion 223, and the fastening hole 222 is located in the bent portion 223 to facilitate connection of the extramedullary steel plate 220 located outside the bone body with the intramedullary needle 210.

[0045] On the basis of being provided with a snap-fit portion 211 and a snap-fit hole 222, in order to improve the connection stability between the intramedullary needle 210 and the extramedullary steel plate 220, an anti-slip screw hole 212 is provided at one end of the intramedullary needle 210 used for connection with the extramedullary steel plate 220; the ultra-fine medullary needle and plate locking system 200 also includes a limiting anti-slip screw 240, a part of which is threadedly connected to the anti-slip screw hole 212, and the remaining part of the limiting anti-slip screw 240 is accommodated in the snap-fit hole 222, and is used to abut against the inner wall of the snap-fit hole 222 and the snap-fit portion 211, so as to limit the movement of the extramedullary steel plate 220 in the direction of separating from the intramedullary needle 210.

[0046] The provision of the position-limiting anti-slip screw 240 can restrict the movement of the bent portion 223 of the extramedullary steel plate 220 relative to the snap-fit portion, thereby improving its installation stability. When providing the snap-fit portion, to facilitate the connection between the snap-fit hole 222 and the snap-fit portion and the installation of the position-limiting anti-slip screw 240, the snap-fit portion 211 is provided with a snap-fitting groove 213 that mates with the snap-fit hole 222. The snap-fitting groove 213 and the anti-slip screw hole 212 are located on opposite sides of the snap-fit portion 211. It should be noted that the snap-fit hole 222 is sleeved within the snap-fit portion, and when the snap-fit hole 222 mates with the snap-fitting groove 213, a gap is formed on the other side thereof to accommodate the position-limiting anti-slip screw 240. The position-limiting anti-slip screw 240 can be installed in this gap, abutting against the inner wall of the snap-fit hole 222 and the snap-fit portion 211, thereby restricting the movement of the extramedullary steel plate 220 in the direction of separation from the intramedullary nail 210.

[0047] As can be seen from the above, the extramedullary steel plate 220 is provided with a bent portion 223. To facilitate the connection between the snap-fit portion and the snap-fit hole 222 when the extramedullary steel plate 220 is connected to the intramedullary nail 210, a mounting bevel 214 is provided on the end of the intramedullary nail 210 that is connected to the extramedullary steel plate 220. The snap-fit portion 211 and the anti-slip screw hole 212 are both provided on the mounting bevel 214. It should be noted that the inclination angle of the mounting bevel 214 can be consistent with the inclination angle of the bent portion 223.

[0048] For further information, please refer to Figure 1-Figure 5 Based on the above-mentioned structural arrangement, after the extramedullary steel plate 220 is connected to the intramedullary nail 210, the multiple locking screws 230 can be matched with the screw mounting holes 221 and all connected to the bone body. In this process, in order to improve the stability of the ultra-fine intramedullary nail plate locking system 200, the multiple locking screws 230 include at least one first locking screw 231 and at least one second locking screw 232; the multiple screw mounting holes 221 include at least one first screw mounting hole 224 and at least one second screw mounting hole 225;

[0049] The first locking screw 231 is matched with the first screw mounting hole 224 , and the portion of the first locking screw 231 connected to the bone body is located on the side of the intramedullary nail 210 close to the extramedullary steel plate 220 ;

[0050] The second locking screw 232 is matched with the second screw mounting hole 225 , and the end of the second locking screw 232 connected to the bone body is located on the side of the intramedullary nail 210 away from the extramedullary steel plate 220 .

[0051] Therefore, through the above-mentioned structural setting, the first locking screw 231 is fixed with unilateral cortical bone, while the second locking screw 232 is locked with bilateral cortical bone, thereby increasing the connection stability between the extramedullary steel plate 220 and the bone body.

[0052] From the above content, it can be seen that since the end of the second locking screw 232 connected to the bone body is located on the side of the intramedullary nail 210 away from the extramedullary steel plate 220, that is, the second locking screw 232 adopts bilateral cortical bone locking, the length of the second locking screw 232 is greater than the length of the first locking screw 231.

[0053] Furthermore, based on the above-mentioned structural setting, when arranging the first locking screw 231, the first screw mounting hole 224 can be located in the area where the extramedullary steel plate 220 is facing the intramedullary nail 210, that is, the first locking screw 231 is located in the area where the extramedullary steel plate 220 is facing the intramedullary nail 210.

[0054] When arranging the second locking screw 232, since the end of the second locking screw 232 connected to the bone body is located on the side of the intramedullary needle 210 away from the extramedullary steel plate 220, in order to avoid the second locking screw 232 and the intramedullary needle 210 from interfering with each other in the bone body, the length of the extramedullary steel plate 220 is greater than the length of the intramedullary needle 210 along the extension direction of the bone body; the extramedullary steel plate 220 includes a first partition 226 and a second partition 227, and the first partition 226 is opposite to the intramedullary needle 210; the first screw mounting hole 224 is opened in the first partition 226, and the second screw mounting hole 225 is opened in the second partition 227.

[0055] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An ultra-fine medullary needle and plate locking system, characterized by: The ultra-fine medullary needle and plate locking system includes an intramedullary needle, an extramedullary plate and a plurality of locking screws; The intramedullary needle and the extramedullary steel plate are both arranged along the extension direction of the bone body, the intramedullary needle is accommodated in the medullary cavity of the bone body, and the extramedullary steel plate is located outside the bone body and connected to one end of the intramedullary needle; The extramedullary steel plate is provided with a plurality of screw mounting holes along its extension direction; each of the locking screws is matched with one of the screw mounting holes and connected to the bone body; One end of the intramedullary nail used for connecting with the extramedullary steel plate is provided with a buckle portion; one end of the extramedullary steel plate used for connecting with the intramedullary nail is provided with a buckle hole buckled with the buckle portion; One end of the extramedullary steel plate used for connection with the intramedullary nail is bent to form a bent portion, and the buckle hole is provided in the bent portion; One end of the intramedullary nail used for connecting with the extramedullary steel plate is provided with an anti-drop screw hole; The ultra-fine intramedullary needle plate locking system also includes a limiting anti-stripping screw, part of which is threadedly connected to the anti-stripping screw hole, and the remaining part of the limiting anti-stripping screw is accommodated in the buckling hole and is used to abut against the inner wall of the buckling hole and the buckling part to limit the movement of the extramedullary steel plate in the direction of separating from the intramedullary needle.

2. The ultra-fine needle and plate locking system according to claim 1, characterized in that: The buckle portion is provided with a buckle groove matched with the buckle hole, and the buckle groove and the anti-slip screw hole are located on two opposite sides of the buckle portion.

3. The ultra-fine needle and plate locking system according to claim 1, characterized in that: One end of the intramedullary nail used for connecting with the extramedullary steel plate is provided with a mounting bevel, and the buckle portion and the anti-drop screw hole are both provided on the mounting bevel.

4. The ultra-fine medullary needle and plate locking system according to any one of claims 1 to 3, characterized in that: The plurality of locking screws include at least one first locking screw and at least one second locking screw; the plurality of screw mounting holes include at least one first screw mounting hole and at least one second screw mounting hole; The first locking screw is matched with the first screw mounting hole, and the portion where the first locking screw is connected to the bone body is located on a side of the intramedullary nail close to the extramedullary steel plate; The second locking screw is matched with the second screw mounting hole, and the end portion of the second locking screw connected to the bone body is located on a side of the intramedullary nail away from the extramedullary steel plate.

5. The ultra-fine medullary needle and plate locking system according to claim 4, characterized in that: The length of the second locking screw is greater than the length of the first locking screw.

6. The ultra-fine medullary needle and plate locking system according to claim 4, characterized in that: The first screw mounting hole is located in an area of the extramedullary steel plate facing the intramedullary nail.

7. The ultra-fine needle and plate locking system according to claim 4, characterized in that: Along the extension direction of the bone body, the length of the extramedullary steel plate is greater than the length of the intramedullary nail; the extramedullary steel plate includes a first partition and a second partition, and the first partition is opposite to the intramedullary nail; the first screw mounting hole is opened in the first partition, and the second screw mounting hole is opened in the second partition.

Images