Intramedullary nail system

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By designing an intramedullary nail system including main nails and locking members, the existing intramedullary nail system is solved, and stable fixation and rapid recovery of the fracture end is achieved.

CN119587133APending Publication Date: 2025-03-11TIANJIN ZHENGTIAN MEDICAL INSTRUMENT CO LTD +1

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Patent Information

Application Number: CN202411585950.5
Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner
Filing Date: 2024-11-08
Publication Date: 2025-03-11

AI Technical Summary

Technical Problem

The existing intramedullary nail system is prone to deviation and bending after long-term use, which cannot ensure good anatomical reset of the broken end. At the same time, the retention of the intramedullary nail is not as firm as that of the steel plate, but the implantation of the steel plate requires open surgery, which is very trauma and has a long recovery time.

Method used

An intramedullary nail system is designed, including a main nail and a locking member. The locking member is composed of a connecting part and a bone plate. The bone plate passes through the locking nail hole on the main nail, and the connecting part is arranged on the locking nail hole of the main nail. It is threaded to the connecting part to achieve a stable fixation between the bone plate and the main nail.

Benefits of technology

The bone plate of the locking member is fixed to both sides of the fracture line, which increases the degree of retention of the intramedullary nail to the fracture end, achieves stable internal fixation, prevents the intramedullary nail from displaced, and reduces surgical trauma and shortens the patient's recovery time.

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Abstract

The invention discloses an intramedullary nail system which comprises a main nail and a locking piece, and a nail locking hole is formed in the main nail; the locking piece comprises a connecting part and a plurality of bone plates, the connecting part comprises at least one connecting block, the connecting blocks and the bone plates are integrally connected in a one-to-one correspondence mode, during implantation, after the bone plates penetrate through the lock nail holes, the connecting part penetrates through the lock nail holes of the main nail, when the number of the connecting blocks is larger than one, all the connecting blocks are spliced into the connecting part, and when the number of the connecting blocks is one, the connecting part is spliced into the main nail. The connecting block is a connecting part, and at least part of each bone plate is attached to the bone substance. According to the intramedullary nail, the locking pieces are fixed to the two sides of the fracture line, the firmness degree of fixing the fracture broken end through the intramedullary nail can be increased, stable internal fixation is achieved, and displacement of the intramedullary nail is prevented; the problem that the intramedullary nail is difficult to take out later is solved, and the influence of stress shielding can be reduced.

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Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an intramedullary nail system. Background Art

[0002] At present, intramedullary nails or bone plates are mostly used for internal fixation of fractures. When intramedullary nails are implanted in the human body for a long time, the screws or intramedullary nails are easily deflected and bent by the force, which cannot ensure the complete and good anatomical reduction of the fracture ends; at the same time, intramedullary nails are not strong internal fixation and are not as strong as steel plates. However, steel plate implantation is an open surgery, which is more traumatic and takes a long time for patients to recover. Summary of the invention

[0003] The purpose of the present application is to provide an intramedullary nail system to solve the problems raised in the above background technology.

[0004] To achieve the above objectives, this application provides the following technical solutions:

[0005] An intramedullary nail system, comprising:

[0006] A main nail, wherein the main nail is provided with a locking nail hole;

[0007] A locking piece, wherein the locking piece comprises a connecting portion and a plurality of bone plates, wherein the connecting portion comprises at least one connecting block, wherein the connecting block is integrally connected to the bone plate in a one-to-one correspondence, and when implanted, after the bone plate passes through the locking nail hole, the connecting portion is passed through the locking nail hole of the main nail, and when the number of the connecting blocks is greater than 1, all the connecting blocks are spliced into the connecting portion, and when the number of the connecting blocks is 1, the connecting block is the connecting portion, and each bone plate at least partially fits the bone.

[0008] Optionally, the locking member further comprises a hollow screw, the inner wall of the hollow screw is provided with an internal thread, the connecting portion is cylindrical and the outer wall is provided with an external thread, and the internal thread of the hollow screw is threadably connected to the external thread of the connecting portion.

[0009] Optionally, the hollow screw is provided with an external thread, and the hollow screw is threadedly connected to the locking nail hole of the main nail.

[0010] Optionally, the connection blocks are snap-connected.

[0011] Optionally, there are two bone plates, namely a first bone plate and a second bone plate, and there are two connecting blocks, namely a first connecting block and a second connecting block. The first bone plate is connected to the first connecting block, and the second bone plate is connected to the second connecting block.

[0012] Optionally, the first connecting block and the second connecting block are both semi-cylindrical, and one of the joint surfaces of the first connecting block and the joint surface of the second connecting block is provided with a slot, and the other joint surface is provided with a protrusion that is plugged into the slot.

[0013] Optionally, the slot can limit the protrusion in the axial and radial directions of the second connecting block.

[0014] Optionally, the first bone plate is provided with a first connecting hole, which is connected to the main nail via a first screw, and / or the second bone plate is provided with a second connecting hole, which is connected to the main nail via a second screw.

[0015] Optionally, the first connecting hole is provided with an internal thread, and / or the second connecting hole is provided with an internal thread.

[0016] Optionally, the intramedullary nail system is made of degradable magnesium alloy.

[0017] In summary, the technical effects and advantages of the present invention are as follows: by fixing the bone plates of the locking device on both sides of the fracture line, the present application can increase the firmness of the intramedullary nail in fixing the fracture ends, achieve stable internal fixation, and prevent displacement of the intramedullary nail; avoid the problem of difficulty in removing the intramedullary nail later, and reduce the impact of stress shielding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a schematic structural diagram of an intramedullary nail system in one embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the use of an intramedullary nail system according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of a hollow screw in one embodiment of the present invention;

[0022] Figure 4 It is a front view of the bone plate and the connecting part after being assembled in one embodiment of the present invention;

[0023] Figure 5 It is a right side view of the assembled bone plate and the connecting part in one embodiment of the present invention;

[0024] Figure 6It is a schematic structural diagram of a first bone plate and a first connecting block in one embodiment of the present invention;

[0025] Figure 7 Schematic diagram of the structure of the second bone plate and the second connecting block in one embodiment of the present invention.

[0026] in:

[0027] 1. main nail; 11. locking nail hole; 2. locking piece; 21. bone plate; 211. first bone plate; 2111. first connecting hole; 212. second bone plate; 2121. second connecting hole; 22. connecting part; 221. first connecting block; 2211. slot; 222. second connecting block; 2221. protrusion; 23. hollow screw; 3. first screw; 4. second screw. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] This embodiment provides an intramedullary nail system, such as Figure 1-Figure 7As shown, the intramedullary nail system includes a main nail 1 and a locking member 2. The main nail 1 is provided with a locking nail hole 11. The locking member 2 includes a connecting portion 22 and a plurality of bone plates 21. The connecting portion 22 includes at least one connecting block. The connecting block is integrally connected with the bone plate 21 in a one-to-one correspondence. When implanted, after the bone plate 21 passes through the locking nail hole 11, the connecting portion 22 is inserted into the locking nail hole 11 of the main nail 1. When the number of connecting blocks is greater than 1, all connecting blocks are spliced into the connecting portion 22. When the number of connecting blocks is 1, the connecting block is the connecting portion 22, and each bone plate 21 at least partially fits the bone.

[0033] In this embodiment, the locking member 2 includes a connecting block and a bone plate 21, and when implanted, the bone plate 21 and the connecting portion 22 are inserted into the locking nail hole 11 from the same side, and after the bone plate 21 passes through the locking nail hole 11, the connecting portion 22 is inserted into the locking nail hole 11. Therefore, the bone plate is implanted at the same position as the connecting portion, and can be minimally invasive without the need for open surgery. Therefore, this solution can use the bone plate to fix and connect the fracture, and avoid the use of open surgery, with less trauma, so that the patient can recover faster.

[0034] The locking member 2 further includes a hollow screw 23, the inner wall of which is provided with an internal thread, the connecting portion 22 is cylindrical and the outer wall is provided with an external thread, and the internal thread of the hollow screw 23 is threadedly connected with the external thread of the connecting portion 22. The hollow screw 23 is firmly connected with the connecting portion 22 through the internal thread, and a plurality of connecting blocks can be connected into a stable connecting portion 22, so that the connection of the locking member 2 is stable and reliable.

[0035] Optionally, the multiple connection blocks in the connection part 22 can be connected to each other, or connected in other ways. In this embodiment, when multiple connection blocks are connected, the multiple connection blocks can be mutually limited in one direction, two directions or 360° to achieve different connection requirements.

[0036] In this embodiment, the hollow screw 23 is provided with an external thread, and the hollow screw 23 is threadedly connected to the locking nail hole 11 of the main nail 1. The hollow screw 23 is firmly connected to the locking nail hole 11 of the main nail 1 through the external thread, so that a more stable and reliable connection can be formed between the entire locking member 2 and the main nail 1.

[0037] In this embodiment, it is preferred that there are two bone plates 21, namely the first bone plate 211 and the second bone plate 212, and there are two connecting blocks, namely the first connecting block 221 and the second connecting block 222. The first bone plate 211 is connected to the first connecting block 221, and the second bone plate 212 is connected to the second connecting block 222. One end of the first bone plate 211 is bent toward one side of the fracture line, and one end of the second bone plate 212 is bent toward the other side of the fracture line. The first connecting block 221 and the second connecting block 222 are assembled into a connecting portion 22 for threaded connection with the internal threaded hole of the hollow screw 23. In this embodiment, the first bone plate 211 and the second bone plate 212 can both be close to both sides of the fracture line of the broken bone, which is convenient for fixing the broken bone or bone fracture.

[0038] Optionally, the first connection block 221 and the second connection block 222 are both semi-cylindrical, and one of the joint surfaces of the first connection block 221 and the second connection block 222 is provided with a slot 2211, and the other joint surface is provided with a protrusion 2221 plugged with the slot 2211. In this embodiment, the slot 2211 and the protrusion 2221 are both arranged along the length direction of the corresponding joint surface, and the slot 2211 limits the protrusion 2221 in the radial direction. In other embodiments, the slot 2211 and the protrusion 2221 can also be in other forms, such as a cross, a columnar or annular shape, and the slot 2211 limits the protrusion 2221 in the axial and radial directions of the second connection block 222, so as to avoid relative staggering of the first connection block 221 and the second connection block 222, and facilitate surgical operations. Optionally, the first bone plate 211 is provided with a first connection hole 2111, and the first connection hole 2111 is connected to the main nail 1 through the first screw 3, and / or the second bone plate 212 is provided with a second connection hole 2121, and the second connection hole 2121 is connected to the main nail 1 through the second screw 4. Optionally, the first connection hole 2111 is provided with an internal thread, and / or the second connection hole 2121 is provided with an internal thread. In this embodiment, the first bone plate 211 and the second bone plate 212 are fixed to the side of the bone fracture by the first screw 3 and the second screw 4, so as to further fix the bone plate 21 and the main nail 1, and the main nail 1, the locking member 2, the first screw 3 and the second screw 4 constitute a firm intramedullary nail system.

[0039] Optionally, the intramedullary nail system is made of degradable magnesium alloy; it can reduce the impact of stress shielding. Magnesium alloy is a degradable implant with good biocompatibility, including tissue compatibility and blood compatibility. The material surface is suitable for cell adhesion, proliferation and differentiation, suitable mechanical properties to minimize stress shielding, and withstand anatomical load requirements. The Young's modulus, elongation at break, and density of magnesium alloy are close to bone properties, thus reducing the potential impact of stress shielding. From a biological point of view, magnesium is involved in basic life activities. The human body magnesium content is about 23g / kg, of which 60% is present in bones, which regulates the magnesium balance in the blood to a certain extent. Magnesium alloy implants will gradually be dissolved by body fluids, and the released magnesium ions will be metabolized by body fluids and further used by the human body in various metabolic processes.

[0040] The working process of this embodiment is as follows: when in use, the main nail 1 is first fixed in the medullary cavity, and then the locking nail hole 11 is punched at the corresponding position of the main nail 1, and after the first bone plate 211 passes through the locking nail hole 11 and the bone at the corresponding position, the first connecting block 221 is inserted into the locking nail hole 11, and then after the second bone plate 212 passes through the locking nail hole 11 and the bone at the corresponding position, the second connecting block 222 is inserted into the locking nail hole 11, and the first connecting block 221 and the second connecting block 222 are spliced into a connecting portion, and a hollow screw 23 with an internal threaded hole is threadedly connected to the connecting portion 22, and the hollow screw 23 is threadedly connected to the locking nail hole 11, and the first bone plate 211 and the second bone plate 212 are fixed on both sides of the fracture line. At the same time, the first screw 3 and the second screw 4 are used to further fix the first bone plate 211 and the second bone plate 212 to the main nail 1. The intramedullary nail system is made of biodegradable magnesium alloy. The main nail 1, the locking piece 2, the first screw 3 and the second screw 4 constitute an absorbable strong fixed intramedullary nail system to achieve the combined fixation of the bone plate and the intramedullary nail. During implantation, the bone plate and the connecting block can be implanted on the same side of the bone. Implantation and fixation can be achieved by simply inserting the locking nail hole, which can achieve minimally invasive surgery and avoid excessive trauma that affects patient recovery.

[0041] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An intramedullary nail system, characterized in that: include: A main nail (1), wherein the main nail (1) is provided with a nail locking hole (11); A locking piece (2), the locking piece (2) comprising a connecting portion (22) and a plurality of bone plates (21), the connecting portion (22) comprising at least one connecting block, the connecting block being integrally connected to the bone plate (21) in a one-to-one correspondence, when implanted, after the bone plate (21) passes through the locking nail hole (11), the connecting portion (22) is inserted into the locking nail hole (11) of the main nail (1), when the number of the connecting blocks is greater than 1, all the connecting blocks are spliced into the connecting portion (22), when the number of the connecting blocks is 1, the connecting block is the connecting portion (22), and each bone plate (21) at least partially fits the bone.

2. The intramedullary nail system according to claim 1, characterized in that: The locking member (2) further comprises a hollow screw (23), the inner wall of the hollow screw (23) being provided with an internal thread, the connecting portion (22) being cylindrical and the outer wall being provided with an external thread, the internal thread of the hollow screw (23) being threadably connected with the external thread of the connecting portion (22).

3. The intramedullary nail system according to claim 2, characterized in that: The hollow screw (23) is provided with an external thread, and the hollow screw (23) is threadedly connected to the locking nail hole (11) of the main nail (1).

4. The intramedullary nail system according to claim 1, characterized in that: The connecting blocks are clamped together.

5. The intramedullary nail system according to claim 2, characterized in that: There are two bone plates (21), namely a first bone plate (211) and a second bone plate (212); there are two connecting blocks, namely a first connecting block (221) and a second connecting block (222); the first bone plate (211) is connected to the first connecting block (221), and the second bone plate (212) is connected to the second connecting block (222).

6. The intramedullary nail system according to claim 5, characterized in that: The first connection block (221) and the second connection block (222) are both semi-cylindrical, and one of the joint surfaces of the first connection block (221) and the second connection block (222) is provided with a slot (2211) and the other joint surface is provided with a protrusion (2221) plugged into the slot (2211).

7. The intramedullary nail system according to claim 6, characterized in that: The slot (2211) limits the protrusion (2221) in the axial and radial directions of the second connecting block (222).

8. The intramedullary nail system according to claim 5, characterized in that: The first bone plate (211) is provided with a first connecting hole (2111), and the first connecting hole (2111) is connected to the main nail (1) via a first screw (3), and / or the second bone plate (212) is provided with a second connecting hole (2121), and the second connecting hole (2121) is connected to the main nail (1) via a second screw (4).

9. The intramedullary nail system according to claim 7, characterized in that: The first connecting hole (2111) is provided with an internal thread, and / or the second connecting hole (2121) is provided with an internal thread.

10. The intramedullary nail system according to claim 1, characterized in that: The intramedullary nail system is made of degradable magnesium alloy.