Internal fixing device for femoral neck fracture

Abstract

The utility model provides a femoral neck fracture internal fixation device. The femoral neck fracture internal fixation device comprises a main nail, a first auxiliary nail and an anti-skid assembly. A matching through hole is formed in the main nail; the first auxiliary nail is arranged at the matching through hole of the main nail in a penetrating manner, and the first auxiliary nail is arranged in the direction perpendicular to the gravity; the anti-skid assembly is used for limiting displacement of the first auxiliary nail and the main nail. The first auxiliary nail is arranged in the direction perpendicular to the gravity, the first auxiliary nail can provide support for the second bone block, when the first auxiliary nail bears the gravity of the second bone block, the first auxiliary nail cannot move axially, and the first auxiliary nail can further apply counter-acting force to the second bone block with the first bone block as the fulcrum. The first bone block and the second bone block are limited to move beyond an allowable range, and the stability of fracture healing is improved.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to an internal fixation device for femoral neck fractures. Background Art

[0002] Femoral neck fracture is a fairly common fracture injury, especially in the elderly population. It belongs to the category of intracapsular fractures and has a fairly high rate of nonunion and avascular necrosis, which are particularly significant in Pauwels type 3 femoral neck fractures, which are less stable. Pauwels type 3 fractures are a less stable type with a larger angle between the fracture line and the horizontal line, making it more difficult to heal. The nonunion rate of Pauwels type 3 fractures can reach 5% to 25%, while the avascular necrosis rate is between 10% and 27%.

[0003] Traditional treatments for this type of fracture mainly include surgical internal fixation and conservative treatment, among which surgical internal fixation is widely used as the preferred treatment method. However, despite the widespread use of surgical internal fixation, the traditional femoral neck fracture internal fixation system is not without its limitations.

[0004] Specifically, the traditional inverted triangle fixation nail internal fixation system may perform poorly in some cases. Its fixation structure is prone to slippage beyond the expected range when subjected to the patient's limb gravity, which means it cannot provide adequate support for the femoral head. In addition, the shear resistance of this system is relatively weak, which increases the risk of fracture nonunion and poses a potential safety hazard to patients. Utility Model Content

[0005] In view of this, the purpose of the utility model is to overcome the deficiencies in the prior art and provide a femoral neck fracture internal fixation device.

[0006] The utility model provides the following technical solutions:

[0007] The embodiment of the present application provides a femoral neck fracture internal fixation device, comprising a main nail, a first auxiliary nail and an anti-slip assembly. The main nail is provided with a matching through hole; the first auxiliary nail is inserted through the matching through hole of the main nail, and the first auxiliary nail is arranged in a direction perpendicular to gravity; the anti-slip assembly is used to limit the displacement of the main nail and the first auxiliary nail.

[0008] In one embodiment, the anti-slip component is an external thread, and the displacement of the main nail and the first auxiliary nail is limited by providing the external thread on the main nail and / or the first auxiliary nail.

[0009] In one embodiment, the two ends of the main nail are respectively a first end and a second end; the two ends of the first auxiliary nail are respectively a head end and a tail end; a first bolt head is arranged on the first end, the outer diameter of the first bolt head is larger than the outer diameter of the first end, and an anti-slip component is arranged on the second end; and / or a second bolt head is arranged on the head end, the outer diameter of the second bolt head is larger than the outer diameter of the head end, and an anti-slip component is arranged on the tail end.

[0010] In one embodiment, the anti-slip component includes: a rotating block, a first stop portion and a second stop portion, a mounting groove is provided on the outer wall of the first auxiliary nail, and the rotating block is rotatably installed in the mounting groove on the first auxiliary nail; the first stop portion is installed on the rotating block, and the first stop portion is located outside the mounting groove, and the angle between the first stop portion and the forward direction of the first auxiliary nail when installed is a first preset angle α, and the first preset angle α is an obtuse angle; the second stop portion is installed on the rotating block, and the second stop portion is located in the mounting groove, and the rotation of the rotating block can drive the first stop portion and the second stop portion to rotate, and the mounting groove is provided with a first slot body wall on the rotation path of the second stop portion, and the first slot body wall stops the rotation of the second stop portion, thereby limiting the rotation of the rotating block and the first stop portion, so that the size of the first preset angle α remains at an obtuse angle.

[0011] In one embodiment, the anti-slip component also includes a pushing rod and a first hinged rod, a first channel is provided inside the first auxiliary nail, and the pushing rod is installed at the first channel; one end of the first hinged rod is hingedly connected to the pushing rod, and the other end of the first hinged rod is hingedly connected to the second stop portion, and when the pushing rod reciprocates in the first channel, it can drive the rotating block to rotate through the first hinged rod and the second stop portion, and the rotation of the rotating block drives the first stop portion to rotate, thereby changing the size of the first preset angle α.

[0012] In one embodiment, the push rod has a first rod body portion and a second rod body portion, the first rod body portion has two ends, one end of the first rod body portion is hinged to the first hinged rod, the other end of the first rod body portion is rotatably connected to one end of the second rod body portion, the second rod body portion has two ends, the other end of the second rod body portion extends out of the first channel, the second rod body portion is threadedly matched with the first channel, so that the second rod body portion can move axially while rotating, and the axial movement of the second rod body portion drives the axial movement of the first rod body portion.

[0013] In one embodiment, two anti-slip components are provided on the first auxiliary nail, and the first hinged rods of the two anti-slip components are hingedly mounted on the same pushing rod.

[0014] In one embodiment, more than two first auxiliary nails are provided, and the number of the matching through holes matches the number of the first auxiliary nails.

[0015] In one embodiment, more than two main nails are provided, and the main nails are arranged in sequence along the length direction of the first auxiliary nails.

[0016] In one embodiment, the matching through hole is an elliptical hole structure.

[0017] In one embodiment, the main nail is a hollow rod structure or a solid rod structure.

[0018] In one of the embodiments, the main nail is inclined relative to the first auxiliary nail at a second preset angle β, wherein 30°≤β≤50°.

[0019] The embodiments of the present utility model have the following advantages:

[0020] The first auxiliary nail is arranged in a direction perpendicular to gravity. The first auxiliary nail can provide support for the second bone block. When the first auxiliary nail is subjected to the gravity of the second bone block, no axial movement will occur. The first auxiliary nail can also use the first bone block as a fulcrum to exert a reaction force on the second bone block, thereby limiting the movement of the first bone block and the second bone block beyond the allowable range, thereby improving the stability of fracture healing.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model 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 creative work.

[0023] Figure 1 A structural schematic diagram showing one perspective of one embodiment of a femoral neck fracture internal fixation device provided in an embodiment of the present application;

[0024] Figure 2 A structural schematic diagram showing another embodiment of a femoral neck fracture internal fixation device provided by an embodiment of the present application from one perspective;

[0025] Figure 3 A structural schematic diagram showing a first auxiliary nail from one perspective of another embodiment of the femoral neck fracture internal fixation device provided by an embodiment of the present application;

[0026] Figure 4 Showing a cross-sectional view from two perspectives of a first auxiliary nail of one embodiment of a femoral neck fracture internal fixation device provided by an embodiment of the present application;

[0027] Figure 5 Shows Figure 4 A partial enlarged view of the middle A;

[0028] Figure 6 Shows Figure 4 A partial enlarged view of point B in the middle;

[0029] Figure 7 A partial enlarged view from three perspectives showing a partial structure of one embodiment of a femoral neck fracture internal fixation device provided in an embodiment of the present application;

[0030] Figure 8 A structural schematic diagram showing a main nail from one perspective of another embodiment of the femoral neck fracture internal fixation device provided in an embodiment of the present application;

[0031] Fig. 9 A schematic structural diagram showing four viewing angles of a main nail of one embodiment of a femoral neck fracture internal fixation device provided in an embodiment of the present application;

[0032] Fig.10 A schematic structural diagram showing a part of the structure of another embodiment of the femoral neck fracture internal fixation device provided in an embodiment of the present application from five perspectives;

[0033] Fig.11 A schematic structural diagram showing a part of the structure of another embodiment of the femoral neck fracture internal fixation device provided in an embodiment of the present application from five perspectives;

[0034] Fig.12 A structural schematic diagram showing a partial structure of another embodiment of a femoral neck fracture internal fixation device provided in an embodiment of the present application from five perspectives.

[0035] Description of main component symbols:

[0036] 100-main nail; 110-matching through hole; 130-first bolt head;

[0037] 200 - first auxiliary nail; 210 - second bolt head; 220 - first channel;

[0038] 300-external thread;

[0039] 400 - rotating block; 410 - mounting groove; 420 - first groove wall; 430 - first stopper; 440 - second stopper; 450 - push rod; 460 - first hinge rod;

[0040] 600-first bone block; 650-second bone block. DETAILED DESCRIPTION

[0041] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0042] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the template herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0046] The embodiments of the present application provide a femoral neck fracture internal fixation device, which can be used for bone repair of femoral neck fracture, and can be particularly applied to the repair of Pauwels III type femoral neck fracture. Figure 1 As shown, after the femur is fractured, the entire bone is broken into a first bone fragment 600 and a second bone fragment 650. The first bone fragment 600 and the second bone fragment 650 are re-fixed together by the femoral neck fracture internal fixation device provided in the embodiment of the present application, and the femoral neck fracture internal fixation device has good shear strength, which can prevent the first bone fragment 600 and the second bone fragment 650 from slipping beyond the allowable range.

[0047] like Figure 1 As shown, the femoral neck fracture internal fixation device includes a main nail 100 and a first auxiliary nail 200, and the first auxiliary nail 200 is installed on the main nail 100. Before installation, a first mounting hole (not shown in the drawings) and a second mounting hole (not shown in the drawings) need to be opened on the bone block, the first mounting hole is opened on the first bone block 600 and the second bone block 650 at the same time (that is, the hole body of the first mounting hole passes through the first bone block 600 and extends to the second bone block 650), the second mounting hole is opened on the first bone block 600 and the second bone block 650 at the same time (that is, the hole body of the second mounting hole passes through the first bone block 600 and extends to the second bone block 650), and the first mounting hole and the second mounting hole are connected.

[0048] like Figure 8 and Fig. 9 As shown, the main nail 100 is provided with a matching through hole 110 .

[0049] like Figure 1 and Figure 2 As shown, the first auxiliary nail 200 is passed through the matching through hole 110 of the main nail 100. The first auxiliary nail 200 is set in a direction perpendicular to gravity. The first auxiliary nail 200 can provide support for the second bone block 650. When the first auxiliary nail 200 is subjected to the gravity of the second bone block 650, no axial movement will occur. The first auxiliary nail 200 can also use the first bone block 600 as a fulcrum to apply a reaction force to the second bone block 650, thereby limiting the movement of the first bone block 600 and the second bone block 650 beyond the allowable range, thereby improving the stability and recovery effect of fracture healing.

[0050] like Figure 1 and Figure 2 As shown, exemplarily, an anti-skid component for limiting displacement is provided on the main nail 100, and an anti-skid component is also provided on the first auxiliary nail 200. In another embodiment, the anti-skid component is not provided on the main nail 100, and the anti-skid component is provided on the first auxiliary nail 200. In another embodiment, the anti-skid component for limiting displacement is provided on the main nail 100, and the anti-skid component is not provided on the first auxiliary nail 200.

[0051] Exemplarily, the anti-slip component is an external thread 300; in one embodiment, an external thread 300 is provided on the main nail 100, and the thread of the external thread 300 is engaged into the hole wall of the first mounting hole. The hole wall of the first mounting hole limits the displacement of the main nail 100 by the thread engagement of the external thread 300. The first auxiliary nail 200 is installed at the matching through hole 110 of the main nail 100, and the main nail 100 limits the radial displacement of the first auxiliary nail 200 by the inner wall of the matching through hole 110.

[0052] like Figure 3 As shown, in another embodiment, the first auxiliary nail 200 is provided with an external thread 300, the thread of the external thread 300 is embedded into the hole wall of the second mounting hole, and the hole wall of the second mounting hole limits the displacement of the first auxiliary nail 200 through the external thread 300. The first auxiliary nail 200 is installed at the matching through hole 110 of the main nail 100, and the first auxiliary nail 200 abuts against the inner wall of the matching through hole 110 to limit the movement of the main nail 100 along the radial direction of the first auxiliary nail 200. Figure 1 As shown, in another embodiment, the anti-slip component is an external thread 300 , and the displacement of the main nail 100 and the first auxiliary nail 200 is limited by providing the external thread 300 on the main nail 100 and the first auxiliary nail 200 .

[0053] like Figure 4 and Figure 5 As shown, in one embodiment, the technical solution of the anti-slip assembly in the above embodiment can also be replaced by the following technical solution:

[0054] The anti-slip assembly includes a rotating block 400 , a first stopping portion 430 and a second stopping portion 440 .

[0055] An installation groove 410 is formed on the outer wall of the first auxiliary nail 200 , and the rotating block 400 is rotatably installed in the installation groove 410 .

[0056] The first stopping portion 430 is installed on the rotating block 400, and the first stopping portion 430 is located outside the installation groove 410. The angle between the first stopping portion 430 and the forward direction of the first auxiliary nail 200 during installation is a first preset angle α, and the first preset angle α is an obtuse angle. When the first auxiliary nail 200 moves in the opposite direction of the installation direction (that is, when the first auxiliary nail 200 moves in the direction of exiting the second installation hole), the first stopping portion 430 can abut and push the inner wall of the first installation hole, so that the first stopping portion 430 stops the first auxiliary nail 200 from exiting the second installation hole, and the first stopping portion 430 does not hinder the first auxiliary nail 200 from advancing and being installed in the second installation hole.

[0057] The second stopper 440 is mounted on the rotating block 400, and the second stopper 440 is located in the mounting groove 410. The rotation of the rotating block 400 can drive the first stopper 430 and the second stopper 440 to rotate. The mounting groove 410 is provided with a first groove body wall 420 on the rotation path of the second stopper 440; Figure 5 As shown, the first slot wall 420 is located between the first stop portion 430 and the second stop portion 440; the first slot wall 420 stops the second stop portion 440 from rotating, thereby limiting the rotation of the rotating block 400 and the first stop portion 430, so that the size of the first preset angle α remains at an obtuse angle.

[0058] like Figure 7 As shown, in another embodiment, a groove is provided on one side of the first slot wall 420 close to the first stopping portion 430, and the shape of the groove matches the first stopping portion 430 to accommodate all or part of the structure of the first stopping portion 430, thereby reducing the protruding volume of the first stopping portion 430 relative to the outer wall of the first auxiliary nail 200. When the first auxiliary nail 200 is installed, the friction between the first stopping portion 430 and the inner wall of the second mounting hole can be reduced.

[0059] like Figure 5 and Figure 6 As shown, in one embodiment, the anti-slip assembly further includes a push rod 450 and a first hinge rod 460 .

[0060] A first channel 220 is provided inside the first auxiliary nail 200, and a push rod 450 is installed at the first channel 220; one end of the first hinged rod 460 is hingedly connected to the push rod 450, and the other end of the first hinged rod 460 is hingedly connected to the second stop portion 440. When the push rod 450 reciprocates in the first channel 220, it can drive the rotating block 400 to rotate through the first hinged rod 460 and the second stop portion 440, and the rotation of the rotating block 400 drives the first stop portion 430 to rotate, thereby changing the size of the first preset angle α.

[0061] During use, the push rod 450 moves in the first channel 220 and pushes the first hinge rod 460 to approach the rotating block 400. The first hinge rod 460 moves and can push the rotating block 400 to rotate through the second stopper 440, so that the first stopper 430 rotates in a direction away from the first slot wall 420, so that the first stopper 430 extends and can stop the first auxiliary nail 200 from moving in a direction of exiting the second mounting hole. When the push rod 450 moves in the first channel 220 and pushes the first hinge rod 460 to move in a direction away from the rotating block 400, the first hinge rod 460 moves and pushes the rotating block 400 to rotate through the second stopper 440. The rotating block 400 rotates so that the first stopper 430 rotates in a direction close to the first slot wall 420, and the friction between the first stopper 430 and the second mounting hole is reduced, which facilitates the first auxiliary nail 200 to be installed or pulled out of the second mounting hole. The first stopper 430 can be extended or retracted by the push rod 450 and the first hinge rod 460, so as to facilitate the removal of the first auxiliary nail 200. When the patient needs to remove the main nail 100 and the first auxiliary nail 200, the first stopper 430 can be retracted by the push rod 450 and the first hinge rod 460, so as to reduce the friction between the first auxiliary nail 200 and the second mounting hole.

[0062] like Figure 6 As shown, in one embodiment, the push rod 450 has a first rod body portion and a second rod body portion, the first rod body portion is closer to the rotating block 400 than the second rod body portion; the first rod body portion has two ends, one end of the first rod body portion is hinged to the first hinge rod 460, the other end of the first rod body portion is rotatably connected to one end of the second rod body portion, the second rod body portion has two ends, the other end of the second rod body portion extends out of the first channel 220; the second rod body portion is threadedly matched with the first channel 220, so that the second rod body portion can move axially while rotating, and the axial movement of the second rod body portion drives the axial movement of the first rod body portion. Exemplarily, an internal thread is provided on the inner wall of the first channel 220, and a thread is provided on the outer wall of the end of the second rod body portion that is rotatably connected to the first rod body portion, and the internal thread of the first channel 220 is matched with the thread on the second rod body portion.

[0063] The two ends of the first auxiliary nail 200 are a head end and a tail end, respectively. The head end is located in the second mounting hole, and the tail end is located outside the second mounting hole; by rotating the second rod portion forward, the first rod portion and the second rod portion can be moved inwardly toward the head end (the first preset angle α decreases during this process), and the first stopper 430 extends; by rotating the second rod portion backward, the first rod portion and the second rod portion can be moved toward the tail end (the first preset angle α increases during this process), and the first stopper 430 is retracted.

[0064] like Figure 5As shown, two anti-skid assemblies are provided, and the two anti-skid assemblies share the same pushing rod 450 , and the first hinge rods 460 of the two anti-skid assemblies are installed on the pushing rod 450 .

[0065] like Figure 8 and Fig. 9 As shown, in one embodiment, the matching through hole 110 is an elliptical hole structure, the first auxiliary nail 200 abuts against the hole wall of the matching through hole 110, and there is a gap between the hole wall of the elliptical hole body of the matching through hole 110 and the first auxiliary nail 200. The second bone block 650 applies a force to the first auxiliary nail 200, so that the first auxiliary nail 200 moves slightly relative to the inner wall of the matching through hole 110, thereby making the second bone block 650 more firmly combined with the inner wall of the small hole diameter of the matching through hole 110, thereby increasing the combination strength of the first auxiliary nail 200 and the main nail 100 and improving reliability.

[0066] In one embodiment, the main nail 100 is a solid rod structure. In another embodiment, the main nail 100 is a hollow rod structure.

[0067] like Figure 2 As shown, in one embodiment, the main nail 100 is inclined relative to the first auxiliary nail 200 at a second preset angle β, wherein 30°≤β≤50°, and illustratively, the second preset angle β=30°. In another embodiment, the second preset angle β=45°. In another embodiment, the second preset angle β=50°.

[0068] like Figure 1 or Figure 2 As shown, in one embodiment, the two ends of the main nail 100 are respectively a first end and a second end; a first bolt head 130 is provided on the first end, the outer diameter of the first bolt head 130 is larger than the outer diameter of the first end, and an external thread 300 is provided on the second end.

[0069] like Figure 1 As shown, in another embodiment, the two ends of the first auxiliary nail 200 are respectively a head end and a tail end. A second bolt head 210 is arranged on the head end, and the outer diameter of the second bolt head 210 is larger than the outer diameter of the head end, and an anti-slip component is arranged on the tail end (the anti-slip components of both technical solutions are acceptable).

[0070] like Figure 1 or Figure 2 As shown, in another embodiment, a first bolt head 130 is provided on the first end, and the outer diameter of the first bolt head 130 is larger than the outer diameter of the first end, and the second end is provided with an external thread 300. A second bolt head 210 is provided on the head end, and the outer diameter of the second bolt head 210 is larger than the outer diameter of the head end, and an anti-slip component is provided on the tail end (the anti-slip components of both technical solutions are acceptable).

[0071] In one embodiment, more than two first auxiliary nails 200 are provided, and the number of the matching through holes 110 is matched with the number of the first auxiliary nails 200. Fig.10 As shown, three matching through holes 110 are provided on the main nail 100, and three first auxiliary nails 200 are provided. In another embodiment, two matching through holes 110 are provided on the main nail 100, and two first auxiliary nails 200 are provided.

[0072] In one embodiment, more than two main nails 100 are provided, and the plurality of main nails 100 are sequentially arranged along the length direction of the first auxiliary nail 200. Fig.11 As shown, three main nails 100 are provided, and the first auxiliary nail 200 passes through the matching through holes 110 provided in the three main nails 100. In another embodiment, two main nails 100 are provided, and the first auxiliary nail 200 passes through the matching through holes 110 provided in the two main nails 100.

[0073] In one embodiment, two or more main nails 100 and first auxiliary nails 200 are provided. Fig.12 As shown, three main nails 100 and three first auxiliary nails 200 are provided, and the arrangement of the main nails 100 and the first auxiliary nails 200 can follow the arrangement of the above embodiments, or can be other arrangements. In another embodiment, two main nails 100 and two first auxiliary nails 200 are provided, and the arrangement of the main nails 100 and the first auxiliary nails 200 can follow the arrangement of the above embodiments, or can be other arrangements.

[0074] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0075] 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, further definition and explanation thereof is not required in subsequent drawings.

[0076] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A femoral neck fracture internal fixation device, characterized in that: include: A main nail (100), wherein the main nail (100) is provided with a matching through hole (110); a first auxiliary nail (200), the first auxiliary nail (200) being inserted through the matching through hole (110) of the main nail (100), and the first auxiliary nail (200) being arranged in a direction perpendicular to gravity; An anti-slip component is used to limit the displacement of the main nail (100) and the first auxiliary nail (200).

2. The femoral neck fracture internal fixation device according to claim 1, characterized in that: The anti-slip component is an external thread (300), and the displacement of the main nail (100) and the first auxiliary nail (200) is limited by arranging the external thread (300) on the main nail (100) and / or the first auxiliary nail (200).

3. The femoral neck fracture internal fixation device according to claim 2, characterized in that: The two ends of the main nail (100) are respectively a first end and a second end; the two ends of the first auxiliary nail (200) are respectively a head end and a tail end; A first bolt head (130) is arranged on the first end, the outer diameter of the first bolt head (130) is larger than the outer diameter of the first end, and an anti-slip component is arranged on the second end; and / or a second bolt head (210) is arranged on the head end, the outer diameter of the second bolt head (210) is larger than the outer diameter of the head end, and an anti-slip component is arranged on the tail end.

4. The femoral neck fracture internal fixation device according to claim 1, characterized in that: The anti-slip assembly comprises: A rotating block (400), wherein a mounting groove (410) is provided on the outer wall of the first auxiliary nail (200), and the rotating block (400) is rotatably mounted in the mounting groove (410) on the first auxiliary nail (200); A first stopper (430), wherein the first stopper (430) is installed on the rotating block (400), and the first stopper (430) is located outside the installation groove (410). The angle between the first stopper (430) and the advancing direction of the first auxiliary nail (200) during installation is a first preset angle α, and the first preset angle α is an obtuse angle; A second stopper (440), wherein the second stopper (440) is mounted on the rotating block (400), and the second stopper (440) is located in the mounting groove (410). The rotation of the rotating block (400) can drive the first stopper (430) and the second stopper (440) to rotate. The mounting groove (410) is provided with a first groove body wall (420) on the rotation path of the second stopper (440). The first groove body wall (420) stops the rotation of the second stopper (440), thereby limiting the rotation of the rotating block (400) and the first stopper (430), so that the size of the first preset angle α is maintained at an obtuse angle.

5. The femoral neck fracture internal fixation device according to claim 4, characterized in that: The anti-slip assembly also includes: A push rod (450), wherein a first channel (220) is provided inside the first auxiliary nail (200), and the push rod (450) is installed at the first channel (220); A first hinged rod (460), one end of the first hinged rod (460) is hingedly connected to the push rod (450), and the other end of the first hinged rod (460) is hingedly connected to the second stop portion (440). When the push rod (450) reciprocates in the first channel (220), it can drive the rotating block (400) to rotate through the first hinged rod (460) and the second stop portion (440), and the rotation of the rotating block (400) drives the first stop portion (430) to rotate, thereby changing the size of the first preset angle α.

6. The femoral neck fracture internal fixation device according to claim 5, characterized in that: The push rod (450) comprises a first rod body portion and a second rod body portion, the first rod body portion having two ends, one end of the first rod body portion being hinged to the first hinge rod (460), the other end of the first rod body portion being rotatably connected to one end of the second rod body portion, the second rod body portion having two ends, the other end of the second rod body portion extending out of the first channel (220), the second rod body portion being threadedly matched with the first channel (220), so that the second rod body portion can move axially while rotating, and the axial movement of the second rod body portion drives the axial movement of the first rod body portion.

7. The femoral neck fracture internal fixation device according to claim 5, characterized in that: Two anti-slip components are arranged on the first auxiliary nail (200), and the first hinged rods (460) of the two anti-slip components are hingedly mounted on the same pushing rod (450).

8. The femoral neck fracture internal fixation device according to any one of claims 1 to 7, characterized in that: More than two of the first auxiliary nails (200) are provided, and the number of the matching through holes (110) provided matches the number of the first auxiliary nails (200); And / or, more than two main nails (100) are provided, and the main nails (100) are arranged in sequence along the length direction of the first auxiliary nail (200).

9. The femoral neck fracture internal fixation device according to claim 8, characterized in that: The matching through hole (110) is an elliptical hole structure; And / or, the main nail (100) is a hollow rod structure or a solid rod structure.

10. The femoral neck fracture internal fixation device according to claim 8, characterized in that: The main nail (100) is inclined at a second preset angle β relative to the first auxiliary nail (200), wherein 30°≤β≤50°.

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