Elastic intramedullary nail with lock for radius

Abstract

The embodiment of the utility model provides an elastic intramedullary nail with a lock for the radius. The elastic intramedullary nail comprises a nail rod body, a fixing end arranged at the far end of the nail rod body and an implanting end arranged at the near end of the nail rod body. The fixed end comprises a first end part and an extending part, a first arc connecting part is formed at the joint of the first end part and the extending part, and the first arc connecting part has a first angle; one end of the extending part of the fixed end is connected with the far end of the nail rod main body, and a second arc connecting part is formed at the joint and has a second angle; the near end of the nail rod main body is connected with one end of the implanting end, a third arc connecting part is formed at the joint, and the third arc connecting part has a third angle; the nail rod body is of an arc-shaped structure, the radian of the nail rod body is 6 degrees, and the fixing end and the implanting end are located on the outer arc side of the nail rod body. According to the elastic intramedullary nail with the lock for the radius, the fixing strength is high, nail retreating can be effectively avoided, and the influence on the forearm function can be reduced.

Description

Technical Field

[0001] This application relates to the technical field of internal fixation for fractures, and particularly to a locked elastic intramedullary nail for the radius bone. Background Art

[0002] The treatment of radius fractures with intramedullary nails has unique advantages. Through minimally invasive surgery, a pre-bent elastic intramedullary nail can be closed and reduced and inserted into the medullary cavity through a small incision. Compared with open reduction and internal fixation surgery, intramedullary nail treatment has less tissue damage, and can achieve the purpose of less trauma and faster postoperative recovery.

[0003] At the same time, stress shielding can be avoided. The intramedullary nail is located in the medullary cavity and does not affect the stress conduction at the fracture site, which is beneficial to fracture healing.

[0004] 1) The fixation strength is insufficient. Currently, data shows that the fixation strength of ordinary elastic intramedullary nails is insufficient. For comminuted fractures, long oblique fractures, and fractures located in the middle and lower 1 / 3 of the radius bone, re-displacement and nail withdrawal are likely to occur.

[0005] 2) Affect the forearm rotation function. If the position of the intramedullary nail is not good, it may affect the physiological curvature (radius bow) of the radius bone, and thus affect the forearm rotation function.

[0006] 3) The surgical requirements are relatively high. There are multiple important concerns during the surgical operation, such as the precise selection of the diameter and length of the intramedullary nail, the selection of the entry point, the reserved length of the nail tail, and the position of the intramedullary nail after reduction. These details all put relatively high requirements on the surgical operation in order to minimize and avoid the occurrence of complications.

[0007] In summary, the treatment of radius fractures with intramedullary nails is widely used clinically, but there are still problems such as limited fixation strength, nail withdrawal, affecting forearm function, and high surgical technical requirements, which need further optimization in design. Utility Model Content

[0008] The embodiments of this application provide a locked elastic intramedullary nail for the radius bone with high fixation strength, which can effectively avoid nail withdrawal and reduce the impact on forearm function.

[0009] A locked elastic intramedullary nail for the radius bone provided by the embodiments of this application includes:

[0010] A nail rod main body, and a fixed end provided at the distal end of the nail rod main body, and an implantation end provided at the proximal end of the nail rod main body;

[0011] The fixed end includes a first end portion and an extension portion, and a first arc connection portion is formed at the connection between the first end portion and the extension portion, and the first arc connection portion has a first angle;

[0012] One end of the extension of the fixed end is connected to the distal end of the nail rod body, and a second arc connection part is formed at the connection, and the second arc connection part has a second angle;

[0013] The proximal end of the nail rod body is connected to one end of the implantation end, and a third arc connection part is formed at the connection, and the third arc connection part has a third angle;

[0014] The nail rod body is an arc-shaped structure, the radian of the nail rod body is 6 degrees, and the fixed end and the implantation end are located on the outer arc side of the nail rod body.

[0015] In some embodiments, the nail rod body, the fixed end and the implantation end are located in the same plane.

[0016] In some embodiments, the nail rod body and the fixed end are flat sheet-like structures, both sides of the flat sheet-like structure have rounded chamfers, and the implantation end is a cylindrical structure.

[0017] In some embodiments, a universal locking hole adapted to the nail cap of the locking nail is formed on the fixed end, and the cross section of the universal locking hole is a trapezoidal structure.

[0018] In some embodiments, a universal locking hole adapted to the nail cap of the locking nail is formed on the fixed end, and the cross section of the universal locking hole is a hemispherical structure.

[0019] In some embodiments, the axis of the end of the implantation end and the axis of the implantation end have an included angle with a preset angle.

[0020] In some embodiments, it includes:

[0021] Symmetrically arranged limiting grooves are formed on both sides at the corresponding positions of the nail rod body.

[0022] In some embodiments, it further includes:

[0023] A limiting clip adapted to the limiting groove, the limiting clip includes two limiting arms adapted to the shape of the limiting groove, and a U-shaped connecting piece connecting the two limiting arms, and the inner side of the limiting arm is a plane.

[0024] In some embodiments, barbs adapted to the bottom surface shape of the limiting groove at the limiting groove of the nail rod body are arranged at the ends of the limiting arms of the limiting clip.

[0025] In some embodiments, there are multiple limiting clips, and the projections of the multiple limiting clips in a plane perpendicular to the axial direction of the nail rod body are at a preset angle.

[0026] The locked elastic intramedullary nail for the radius in the embodiments of the present application has high fixation strength, can effectively avoid nail withdrawal, and can reduce the impact on the function of the forearm.

[0027] It should be understood that the content described in the utility model content part is not intended to limit the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become easily understood through the following description. Brief Description of the Drawings

[0028] Combined with the accompanying drawings and referring to the following detailed description, the above and other features, advantages and aspects of the embodiments of the present application will become more obvious. The drawings are used to better understand the solution and do not constitute a limitation to the present application. In the drawings, the same or similar reference numerals represent the same or similar elements, where:

[0029] Figure 1 Shows a schematic diagram of the overall structure of the locked elastic intramedullary nail for the radius according to an embodiment of the present application;

[0030] Figure 2 Shows a schematic diagram of the arc design of the locked elastic intramedullary nail for the radius according to an embodiment of the present application;

[0031] Figure 3 Shows a cross-sectional view of the universal locking hole of the locked elastic intramedullary nail for the radius that can implement the present application;

[0032] Figure 4 Shows a schematic diagram of the structure of the limiting groove of the locked elastic intramedullary nail for the radius according to the present application;

[0033] Figure 5 Shows a schematic diagram of the structure of the limiting clip of the locked elastic intramedullary nail for the radius according to an embodiment of the present application;

[0034] Figure 6 Shows a schematic diagram of the implantation effect of the locked elastic intramedullary nail for the radius according to an embodiment of the present application. Detailed Embodiments

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0036] In addition, the term "and / or" in this text is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this text generally indicates that the associated objects before and after are in an "or" relationship.

[0037] The present application provides an interlocking elastic intramedullary nail for the radius, which has a high fixing strength, can effectively avoid nail withdrawal, and can reduce the impact on the function of the forearm.

[0038] Specifically, as Figure 1 shown, it is a schematic diagram of the overall structure of the interlocking elastic intramedullary nail for the radius according to an embodiment of the present application. Referring to Figure 1 , the interlocking elastic intramedullary nail for the radius according to the embodiment of the present application includes:

[0039] The nail rod main body 1, and a fixed end 2 provided at the distal end 8 of the nail rod main body 1, and an implantation end 3 provided at the proximal end 9 of the nail rod main body 1. The distal end and the proximal end in this embodiment are referential names for both ends of the nail rod main body 1 and should not be understood as fixed names for both ends of the nail rod main body 1. And, Figure 1 The linear direction shown in

[0040] is the linear direction of the interlocking elastic intramedullary nail for the radius according to the embodiment of the present application, and its key point is to reflect the overall bending condition of the elastic intramedullary nail.

[0041] Specifically, referring to Figure 2 , Figure 2The figure shows a schematic diagram of the arc design of a locked elastic intramedullary nail for the radius according to an embodiment of the present application. In the elastic intramedullary nail of this embodiment, the AB section is the first end portion, the BC section is the extension portion, the connection between the AB section and the BC section is the first arc connection portion, and the angle of the first arc connection portion is 165 degrees. The CD section is the main body of the nail rod, the connection between the BC section and the CD section is the second arc connection portion, and the angle of the second arc connection portion is 159 degrees. The DE section is the implantation end, and the connection between the CD section and the DE section is the third arc connection portion, and the angle of the third arc connection portion is 164 degrees. In this embodiment, the tips of the first arc connection portion, the second arc connection portion, and the third arc connection portion can be arc-shaped, and the smoothness is increased to facilitate the implantation of the elastic intramedullary nail. At the same time, the radial arc of the middle part of the nail rod main body is 6°, which can not only restore the radius arch but also reduce the problems of nail withdrawal or fracture end separation caused by excessive elasticity. In the prior art, the side arc of the middle part of the nail rod main body is 9°. When the metal nail rod is elastic and the radius is in a tense state, on the one hand, it is not conducive to the recovery of the radius, and on the other hand, it will affect the physiological arc of the radius and thus affect the rotation function of the forearm. By adopting a design of 6°, while being able to play a supporting role, it can avoid the problems caused by excessive elasticity of the metal nail rod, such as affecting recovery or causing nail withdrawal. Reducing the arc of the elastic nail can reduce the occurrence of nail withdrawal. According to the anatomical structure characteristics of the radius itself, the arc of the radius arch is 9°. The applicant found in the practice process that when the forearm rotates, the arc of the radius arch should be at least more than 6° to avoid the loss of rotation function. And when the arc of the radius intramedullary nail is too large, according to Hooke's law, the greater the force of deformation of the elastic nail. According to the matching situation of the pre-bent arc of the intramedullary nail and the medullary cavity, when the medullary cavity is narrow, the intramedullary nail will elongate, and then nail withdrawal or the intramedullary nail will penetrate out. The pre-bent arc of the intramedullary nail in this embodiment is 6°, which can not only meet the requirements of functional reduction but also avoid the occurrence of nail withdrawal or penetration.

[0042] Moreover, the nail rod main body, the fixed end, and the implantation end are located in the same plane, that is, their projections in the plane perpendicular to the axis of the nail rod main body coincide, and their projections in the plane parallel to the axis of the nail rod main body are also straight lines, that is, there is no radial offset between the nail rod main body, the fixed end, and the implantation end.

[0043] As an embodiment of the present application, the nail rod main body and the fixed end are flat sheet-like structures, and both sides of the flat sheet-like structure have rounded chamfers, and the implantation end is a cylindrical structure. In this embodiment, the nail rod main body and the fixed end adopt flat sheet-like structures, which can avoid the rotation of the elastic intramedullary nail in the medullary cavity after implantation. Both sides of the flat sheet-like structure have rounded chamfers, which can avoid damage to the bone by the tips.

[0044] As an embodiment of the present application, a universal locking hole adapted to the nail cap of the locking nail is provided on the fixed end, and the cross-section of the universal locking hole is a trapezoidal structure. Specifically, asFigure 3 As shown, it is a sectional view of the universal locking hole of the locked elastic intramedullary nail for the radius. In this embodiment, the diameter of the top opening of the universal locking hole is 1.5 mm, and the diameter of the bottom opening is 1.0 mm. The universal locking hole is used to accommodate the nail head of the locking nail, so that the locking nail can penetrate the locking hole from multiple directions, that is, it can be inserted at a certain angle deviating from the vertical direction, so that the elastic intramedullary nail can be fixed according to actual needs, making the fixation effect better. At the same time, it can avoid the interference of important anatomical structures, enhance the grasping force of the locking nail, and the contact area between the nail hole wall and the nail head of the locking nail is larger, so as to enhance the grasping force of the locking hole on the locking nail, that is, improve the stability of the locking nail. At the same time, by optimizing the stress distribution, the shape design of the locking hole in the embodiment of the present application can optimize the stress distribution of the elastic intramedullary nail and the locking nail, and improve the mechanical properties of the entire internal fixation system. Especially for osteoporosis patients,

[0045] When inserting the locking nail, in the distal medullary cavity of the radius, the closer to the radiocarpal joint surface, the stronger the holding force.

[0046] Figure 6 The schematic diagram of the implantation effect of the locked elastic intramedullary nail for the radius according to the embodiment of the present application is shown. After the elastic intramedullary nail is implanted, the fixed end of the elastic intramedullary nail is located at the wrist position, and the implantation end of the elastic intramedullary nail is located at the elbow.

[0047] In addition, in some other embodiments, the cross-section of the universal locking hole is a hemispherical structure. The locking hole with a hemispherical structure can achieve similar technical effects to the locking hole with a trapezoidal shape, which will not be repeated here.

[0048] In some embodiments, the axis of the end of the implantation end has a preset angle with the axis of the implantation end. That is, a bending structure is formed at the end of the implantation end, so as to avoid the rotation of the elastic intramedullary nail and the resulting nail withdrawal.

[0049] As an embodiment of the present application, symmetrically arranged limiting grooves 101 are formed on both sides at the corresponding positions of the nail rod body 1. And a limiting clip 11 adapted to the limiting groove 101, the limiting clip 11 includes two limiting arms 1102 adapted to the shape of the limiting groove 101, and a U-shaped connecting piece 1101 connecting the two limiting arms, and the inner side of the limiting arm is a plane. The end of the limiting arm 1102 of the limiting clip 11 is provided with a barb 1103 adapted to the bottom surface shape at the limiting groove 101 of the nail rod body 1.

[0050] Figure 4 The schematic diagram of the structure of the limiting groove of the locked elastic intramedullary nail for the radius according to the present application is shown. Figure 5 The schematic diagram of the structure of the limiting clip of the locked elastic intramedullary nail for the radius according to the embodiment of the present application is shown.

[0051] In this embodiment, the limiting grooves are symmetrically arranged in pairs at one or more positions on the main body of the nail rod, and are used to cooperate with the limiting clip to fix the main body of the elastic intramedullary nail, preventing the elastic intramedullary nail from rotating in the medullary cavity. During use, the limiting clip is clamped at the limiting groove, the limiting arm of the limiting clip is placed into the limiting groove, and the barb at the bottom of the limiting clip hooks the bottom of the main body of the nail rod, so that the limiting clip can be fixed to prevent the limiting clip from withdrawing.

[0052] To achieve a better fixing effect, there are multiple limiting clips, and the projections of the multiple limiting clips on a plane perpendicular to the axial direction of the main body of the nail rod form a preset angle.

[0053] The locked elastic intramedullary nail for the radius in the embodiment of the present application has high fixing strength, can effectively avoid nail withdrawal, and can reduce the impact on the function of the forearm.

[0054] The above specific implementation manners do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A locking elastic intramedullary nail for radius, characterized in that: include: A nail rod body, and a fixed end disposed at the distal end of the nail rod body and an implantation end disposed at the proximal end of the nail rod body; The fixed end includes a first end portion and an extension portion, a first arc connection portion is formed at the connection between the first end portion and the extension portion, and the first arc connection portion has a first angle; One end of the extension portion of the fixed end is connected to the distal end of the nail rod body, and a second arc connection portion is formed at the connection, and the second arc connection portion has a second angle; The proximal end of the nail rod body is connected to one end of the implantation end, and a third arc connection portion is formed at the connection, and the third arc connection portion has a third angle; The nail rod body is an arc-shaped structure, the arc of the nail rod body is 6 degrees, and the fixed end and the implantation end are located on the outer arc side of the nail rod body.

2. The elastic intramedullary nail according to claim 1, characterized in that: The nail rod body, the fixing end and the implantation end are located in the same plane.

3. The elastic intramedullary nail according to claim 1, characterized in that: The nail rod body and the fixed end are flat sheet structures, both sides of the flat sheet structure have arc-shaped chamfers, and the implantation end is a cylindrical structure.

4. The elastic intramedullary nail according to claim 1, characterized in that: The fixed end is provided with a universal locking hole adapted to match the nail cap of the locking nail, and the cross section of the universal locking hole is a trapezoidal structure.

5. The elastic intramedullary nail according to claim 1, characterized in that: The fixed end is provided with a universal locking hole adapted to match the nail cap of the locking nail, and the cross section of the universal locking hole is a hemispherical structure.

6. The elastic intramedullary nail according to claim 4 or 5, characterized in that: The axis of the end of the implant end has an included angle of a preset angle with the axis of the implant end.

7. The elastic intramedullary nail according to claim 6, characterized in that: include: Symmetrically arranged limiting grooves are formed on both sides of corresponding positions of the nail rod body.

8. The elastic intramedullary nail according to claim 7, characterized in that: Also includes: A limiting clamp adapted to the limiting groove comprises two limiting arms adapted to the shape of the limiting groove and a U-shaped connecting piece connecting the two limiting arms, and the inner side of the limiting arm is a plane.

9. The elastic intramedullary nail according to claim 8, characterized in that: The end of the limiting arm of the limiting clamp is provided with a barb that matches the bottom surface shape of the limiting groove of the nail rod body.

10. The elastic intramedullary nail according to claim 9, characterized in that: There are a plurality of the limiting clamps, and projections of the plurality of limiting clamps on a plane perpendicular to the axial direction of the nail rod body form a preset angle.

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