Intramedullary nail structure

Abstract

The present invention provides an intramedullary nail structure comprising a first fixing nail, a second fixing nail, and a first flexible connector. The first end of the first flexible connector is disposed within and connected to the first fixing nail, and the second end of the first flexible connector is disposed within and connected to the second fixing nail. The first and second fixing nails are movable relative to each other via the first flexible connector. The technical solution provided in this application can address the prior art issue of joint immobility after fusion therapy.

Description

Technical Field

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

[0002] For patients with ankle trauma and osteoarthritis, they cannot walk or engage in physical labor for a long time, which seriously affects their work and life. Currently, such patients are mainly treated through ankle fusion and replacement surgery.

[0003] Ankle arthrodesis is typically treated with an intramedullary nail, which is inserted through the talocervical and tibiotalar joints. However, this treatment involves the fixation of both the talocervical and tibiotalar joints, leading to a complete loss of range of motion in these two joints. This hinders normal joint function and prevents patients from exercising early after surgery. Summary of the Invention

[0004] The present invention provides an intramedullary nail structure to solve the problem in the prior art that a joint cannot move after fusion treatment.

[0005] The present invention provides an intramedullary nail structure, which includes: a first fixing nail, a second fixing nail and a first flexible connector, wherein the first end of the first flexible connector is inserted into the first fixing nail and connected to the first fixing nail, and the second end of the first flexible connector is inserted into the second fixing nail and connected to the second fixing nail, and the first fixing nail and the second fixing nail can move relative to each other through the first flexible connector.

[0006] Furthermore, the first fixing nail has a first mounting hole, the second fixing nail has a second mounting hole, the first end of the first flexible connector is fixed in the first mounting hole, and the second end of the first flexible connector is movably disposed in the second mounting hole.

[0007] Furthermore, a limiting structure is provided between the second end of the first flexible connector and the second mounting hole.

[0008] Furthermore, the second mounting hole has a tapered hole section, and the diameter of the tapered hole section gradually increases from the second fixing nail to the first fixing nail, and the tapered hole section cooperates with the second end of the first flexible connector to limit position.

[0009] Furthermore, the first flexible connector has a first section, a second section and a third section connected to each other, the first section and the second section are stepped structures, the diameter of the first section is larger than the diameter of the second section, and the diameter of the third section gradually increases in the direction away from the first section.

[0010] Furthermore, a thread structure is provided between the first fixing nail and the second fixing nail, and the first fixing nail and the second fixing nail can be connected and fixed via the thread structure.

[0011] Furthermore, one end of the first mounting hole close to the second fixing nail has an internal thread, the end of the second fixing nail with the second mounting hole is provided with an annular boss, the annular boss is provided with an external thread, and the internal thread and the external thread constitute a threaded structure.

[0012] Furthermore, the intramedullary nail structure also includes a third fixing nail and a second flexible connector, the first end of the second flexible connector is passed through the second fixing nail and connected to the second fixing nail, the second end of the second flexible connector is passed through the third fixing nail and connected to the third fixing nail, and the second fixing nail and the third fixing nail can move relative to each other through the second flexible connector.

[0013] Furthermore, the intramedullary nail structure also includes a transverse locking nail, and the first fixing nail and the second fixing nail are both penetrated by a transverse locking nail.

[0014] Furthermore, the first flexible connector and / or the second flexible connector is made of polycarbonate polyurethane material.

[0015] The present invention employs a technical solution, comprising an intramedullary nail structure comprising a first fixation nail, a second fixation nail, and a first flexible connector. The first and second fixation nails are connected by the first flexible connector and are capable of relative movement. This structure allows for the fixation of a patient's joint while simultaneously enabling relative joint movement, supporting the patient's normal physiological activities, facilitating early rehabilitation training, and improving rehabilitation outcomes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 A cross-sectional view of an intramedullary nail structure provided according to an embodiment of the present invention is shown;

[0018] Figure 2 A schematic diagram of an intramedullary nail structure provided according to an embodiment of the present invention is shown;

[0019] Figure 3 Shown Figure 1 A perspective view of the first fixing pin;

[0020] Figure 4 Shown Figure 1 a cross-sectional view of the first fixing pin;

[0021] Figure 5 Shown Figure 1 A perspective view of the second fixing pin;

[0022] Figure 6Shown Figure 1 a cross-sectional view of the second fixing pin;

[0023] Figure 7 Shown Figure 1 A schematic structural diagram of the first flexible connector;

[0024] Figure 8 An enlarged view of the connection between the first fixing nail and the second fixing nail provided according to an embodiment of the present invention is shown;

[0025] Figure 9 Shown Figure 1 A perspective view of the third fixing pin;

[0026] Figure 10 Shown Figure 1 Cross-sectional view of the third fixing pin.

[0027] The above drawings include the following reference numerals:

[0028] 10. First fixing nail; 11. First mounting hole; 20. Second fixing nail; 21. Second mounting hole; 22. Annular boss; 30. First flexible connector; 31. First section; 32. Second section; 33. Third section; 40. Third fixing nail; 50. Second flexible connector; 60. Horizontal locking nail. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying 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 embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] like Figure 1 and Figure 2As shown, an embodiment of the present application provides an intramedullary nail structure, which includes: a first fixing nail 10, a second fixing nail 20, and a first flexible connector 30. The first end of the first flexible connector 30 is inserted into and connected to the first fixing nail 10, and the second end of the first flexible connector 30 is inserted into and connected to the second fixing nail 20. The first fixing nail 10 and the second fixing nail 20 are able to move relative to each other through the first flexible connector 30. In this way, after the first fixing nail 10 and the second fixing nail 20 are fused to the bone, the joint fused by the first fixing nail 10 and the second fixing nail 20 can move within a certain range, allowing the patient to move normally and avoiding problems such as abnormal joint compression and excessive burden on adjacent joints caused by joint immobility. In this embodiment, the first fixing nail 10 is used for fusion connection with the tibia, and the second fixing nail 20 is used for fusion connection with the talus.

[0031] The technical solution provided in this application connects the first and second fixing pins 10 and 20 via a first flexible connector 30, allowing them to move relative to each other. This structure allows for the patient's joints to be fixed while also allowing for relative movement, satisfying the patient's normal physiological needs, facilitating early rehabilitation training, and improving rehabilitation outcomes. Furthermore, this solution is simple in structure and offers low installation and manufacturing costs.

[0032] like Figures 3 to 6 As shown, the first fixing nail 10 has a first mounting hole 11, the second fixing nail 20 has a second mounting hole 21, the first end of the first flexible connector 30 is fixed in the first mounting hole 11, and the second end of the first flexible connector 30 is movably disposed in the second mounting hole 21. This structure allows for relative displacement between the second fixing nail 20 and the first fixing nail 10, allowing the joint to move within this displacement range, thereby ensuring joint treatment while meeting the requirements for joint movement.

[0033] The first flexible connector 30 can be fixed in the first mounting hole 11 by injection molding.

[0034] In this embodiment, a limiting structure is provided between the second end of the first flexible connector 30 and the second mounting hole 21. The limiting structure can limit the maximum displacement of the first flexible connector 30 and the second fixing nail 20, thereby preventing the first flexible connector 30 from being dislodged from the second fixing nail 20, thereby causing the connection between the first fixing nail 10 and the second fixing nail 20 to fail.

[0035] Specifically, the second mounting hole 21 has a tapered hole section, the diameter of which gradually increases from the second fixing nail 20 to the first fixing nail 10. The tapered hole section cooperates with the second end of the first flexible connector 30 to limit the maximum displacement of the first flexible connector 30. The tapered hole section is provided to limit the maximum displacement of the first flexible connector 30, resulting in a simple structure and convenient design.

[0036] like Figure 7 As shown, the first flexible connector 30 comprises a first section 31, a second section 32, and a third section 33, which are interconnected. The first section 31 and the second section 32 are stepped structures, with the diameter of the first section 31 being larger than that of the second section 32, and the diameter of the third section 33 gradually increasing as it moves away from the first section 31. Positioning can also be achieved by configuring the third section 33 to have a conical structure. In this embodiment, a conical hole section is provided in the second mounting hole 21, and the third section of the first flexible connector 30 is also configured to have a conical structure. The configuration of the conical hole section and the third section as an adaptor ensures effective connection between the second fixing pin 20 and the first flexible connector 30, while also enabling relative displacement between the two.

[0037] A threaded structure is provided between the first fixing nail 10 and the second fixing nail 20, allowing the first fixing nail 10 and the second fixing nail 20 to be connected and fixed via the threaded structure. The threaded structure facilitates securing the first fixing nail 10 and the second fixing nail 20 during initial installation, ensuring the relative position of the first fixing nail 10 and the second fixing nail 20 during installation. After installation, the first fixing nail 10 and the second fixing nail 20 can be unscrewed to allow relative movement.

[0038] like Figure 8 The first mounting hole 11 has an internal thread at one end near the second fixing pin 20. The second fixing pin 20 has an annular boss 22 at the end facing the second mounting hole 21. The annular boss 22 has an external thread. The internal and external threads together form a threaded structure. This design is simple in structure and easy to manufacture and process.

[0039] like Figure 9 and Figure 10 As shown, the intramedullary nail structure also includes a third fixing nail 40 and a second flexible connector 50. The first end of the second flexible connector 50 is disposed within and connected to the second fixing nail 20, and the second end of the second flexible connector 50 is disposed within and connected to the third fixing nail 40. The second and third fixing nails 20 and 40 are able to move relative to each other via the second flexible connector 50. In this embodiment, the third fixing nail 40 is configured to fuse with the calcaneus. By adding the third fixing nail 40 and the second flexible connector 50, the length of the intramedullary nail structure can be increased, thereby increasing the treatment length of the bone to meet the requirements of different joint treatments.

[0040] Specifically, a third mounting hole is provided at the end of the second fixing nail 20 away from the first fixing nail 10, and a fourth mounting hole is provided at the end of the third fixing nail 40. The first end of the second flexible connector 50 is fixed in the third mounting hole, and the second end of the second flexible connector 50 is movably disposed in the fourth mounting hole. For ease of design and processing, the structure of the third mounting hole can be designed to be the same as that of the first mounting hole 11, the structure of the fourth mounting hole can be designed to be the same as that of the second mounting hole 21, and the first flexible connector 30 and the second flexible connector 50 can be designed to have the same structure.

[0041] The intramedullary nail structure further includes a transverse locking nail 60, which is passed through the first fixing nail 10 and the second fixing nail 20. The transverse locking nail 60 can improve the connection strength between the fixing nail and the bone.

[0042] The first, second, and third fixing pins 10, 20, and 40 are generally made of medical titanium alloy, while the first and second flexible connectors 30, 50 are made of flexible biological materials. In this embodiment, the first and / or second flexible connectors 30, 50 are made of polycarbonate-type polyurethane. This material offers good strength, flexibility, and elasticity, allowing for a certain degree of elastic deformation. This material allows for relative movement while connecting the first and second fixing pins 10, 20, and the second and third fixing pins 20, 40.

[0043] The intramedullary nail structure provided by this application has a simple structure and low design and manufacturing costs. After fusing with the bones, it can meet the normal activities of the joints, avoid problems such as slow recovery, adjacent joint wear, and lesions caused by joint fixation, and improve the treatment effect and postoperative recovery effect.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0045] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0046] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0047] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0048] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0049] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An intramedullary nail structure, characterized in that: The intramedullary nail structure comprises: a first fixing nail (10), a second fixing nail (20) and a first flexible connector (30), wherein a first end of the first flexible connector (30) is passed through the first fixing nail (10) and is connected to the first fixing nail (10), and a second end of the first flexible connector (30) is passed through the second fixing nail (20) and is connected to the second fixing nail (20), and the first fixing nail (10) and the second fixing nail (20) are relatively movable via the first flexible connector (30); the first fixing nail (10) has a first mounting hole ( 11), the second fixing nail (20) has a second mounting hole (21), the first end of the first flexible connector (30) is fixed in the first mounting hole (11), and the second end of the first flexible connector (30) is movably arranged in the second mounting hole (21); a threaded structure is provided between the first fixing nail (10) and the second fixing nail (20), and the first fixing nail (10) and the second fixing nail (20) can be connected and fixed by the threaded structure; wherein the first flexible connector (30) is fixed in the first mounting hole (11) by injection molding.

2. The intramedullary nail structure according to claim 1, characterized in that: A limiting structure is provided between the second end of the first flexible connector (30) and the second mounting hole (21).

3. The intramedullary nail structure according to claim 2, characterized in that: The second mounting hole (21) has a tapered hole section, and the diameter of the tapered hole section gradually increases from the second fixing nail (20) to the first fixing nail (10), and the tapered hole section cooperates with the second end of the first flexible connector (30) to limit the position.

4. The intramedullary nail structure according to claim 1, characterized in that: The first flexible connector (30) comprises a first section (31), a second section (32) and a third section (33) which are connected to each other, wherein the first section (31) and the second section (32) are stepped structures, and the diameter of the first section (31) is larger than the diameter of the second section (32), and the diameter of the third section (33) gradually increases in a direction away from the first section (31).

5. The intramedullary nail structure according to claim 1, characterized in that: An end of the first mounting hole (11) close to the second fixing nail (20) has an internal thread, and an end of the second fixing nail (20) having the second mounting hole (21) is provided with an annular boss (22), and an external thread is provided on the annular boss (22), and the internal thread and the external thread constitute the thread structure.

6. The intramedullary nail structure according to claim 1, characterized in that: The intramedullary nail structure further includes a third fixing nail (40) and a second flexible connector (50), wherein the first end of the second flexible connector (50) is inserted into the second fixing nail (20) and connected to the second fixing nail (20), and the second end of the second flexible connector (50) is inserted into the third fixing nail (40) and connected to the third fixing nail (40), and the second fixing nail (20) and the third fixing nail (40) are capable of relative movement via the second flexible connector (50).

7. The intramedullary nail structure according to claim 1, characterized in that: The intramedullary nail structure further comprises a transverse locking nail (60), and the transverse locking nail (60) is penetrated through both the first fixing nail (10) and the second fixing nail (20).

8. The intramedullary nail structure according to claim 6, characterized in that: The first flexible connector (30) and / or the second flexible connector (50) are made of polycarbonate polyurethane material.

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