Bionic internal fixation system for femoral neck

Abstract

The application relates to the technical field of femoral neck fracture treatment, in particular to a femoral neck bionic internal fixation system, which comprises a sliding sleeve, a lever top rod, an anti-rotation screw, a fixing screw and a hollow sliding rod, the sliding sleeve is fixed on a femur through the fixing screw, the anti-rotation screw is horizontally arranged, the sliding sleeve and the sliding rod are obliquely arranged, one end of the sliding rod is slidably connected in the sliding sleeve, a strip-shaped hole is formed in the sliding rod and used for penetrating the anti-rotation screw, the lever top rod is used for being inserted into the sliding rod to limit and bear the anti-rotation screw, and a lever top rod limiting nut is connected to the lower end of the lever top rod. The anti-rotation screw is horizontally arranged, the sliding rod is obliquely arranged, and the two constitute a bionic triangular area structure, so that the femoral head is stably fixed, the problem of poor anti-rotation and anti-shearing force effect in the prior art is solved, the interference on the blood supply outside the femoral head is reduced, and the possibility of nonunion and femoral head necrosis is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of femoral neck fracture treatment, in particular to a femoral neck bionic internal fixation system. BACKGROUND

[0002] Femoral neck fracture refers to a fracture occurring below the femoral head and above the base of the femoral neck due to direct or indirect violence. Figure 1 The femoral neck dynamic anti-rotation system (such as the one shown in Fig. 1) is one of the main ways to treat proximal femur fracture at present, which includes a dynamic rod 4, an anti-rotation nail 5 and a fixed nail 6, etc. SUMMARY

[0003] The present application aims to provide a femoral neck bionic internal fixation system to solve the problem of poor anti-rotation and anti-shearing force effect of the femoral neck dynamic anti-rotation system.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical solution:

[0005] The femoral neck bionic internal fixation system comprises a sliding sleeve, a lever top rod, an anti-rotation screw, a fixed screw and a hollow sliding rod. The sliding sleeve is fixed on the femur by the fixed screw, the anti-rotation screw is horizontally arranged, and the sliding sleeve and the sliding rod are obliquely arranged. One end of the sliding rod is slidingly connected in the sliding sleeve, and a strip-shaped hole is formed in the sliding rod for the anti-rotation screw to pass through. The lever top rod is used for inserting into the sliding rod to limit and support the anti-rotation screw, and the lever top rod is connected with a lever top rod limiting nut.

[0006] The principle of the present application is as follows:

[0007] The sliding sleeve is obliquely implanted from the lateral side of the upper end of the femur and is fixed by the fixed screw, so that the sliding rod is obliquely implanted into the femoral head across the fracture line. The anti-rotation screw is transversely implanted from the lateral side of the upper end of the femur, passes through the sliding rod from the strip-shaped hole and then exactly passes through the lower cortex in the femoral head (at the acetabular fossa, exactly avoiding the iliac bone), and the lever top rod is driven into the sliding sleeve to abut against the anti-rotation screw, thereby limiting and supporting the anti-rotation screw. The lever top rod limiting nut is used for fixing the lever top rod in the sliding sleeve. The anti-rotation screw is transversely arranged, and the sliding rod is obliquely arranged, which form a triangular area to stably fix the femoral head, solve the problem of poor anti-rotation and anti-shearing force effect of the prior art, and reduce the interference with the blood supply on the lateral side of the femoral head, the possibility of nonunion and femoral head necrosis.

[0008] The present application has the following beneficial effects:

[0009] 1. The sliding rod is slidably connected inside the sliding sleeve. In actual use, the sliding rod can slide slightly along the sliding sleeve, allowing the fracture ends to slide and apply pressure, thereby improving the fracture healing rate.

[0010] 2. The hole on the sliding rod for the anti-rotation screw to pass through is designed as a strip hole to accommodate the slight sliding of the sliding rod.

[0011] 3. The sliding rod and anti-rotation screw form a triangular area, which has a larger angle than existing technologies, resulting in better anti-rotation effect, more stable fixation, and better structural strength.

[0012] 4. The sliding rod and anti-rotation screw are set separately, which can better distribute stress, avoid fracture due to stress concentration, and also ensure the service life of the structure.

[0013] 5. The anti-rotation screw passes horizontally through the medial cortex of the femoral head, and is supported by a lever rod underneath. This not only increases the anti-rotation effect, but also effectively counteracts the downward shear force at the fracture ends, ensuring fixation and improving healing speed.

[0014] Furthermore, the other end of the sliding rod is provided with a pressure-resistant surface, which is horizontal after the sliding rod is inserted.

[0015] Beneficial effects: When a person walks, the femur is subjected to the vertical downward force of the upper body. By setting a horizontal pressure-resistant surface on the sliding rod after implantation, compared with the ordinary sliding rod end contacting the vertical downward force point, this solution can increase the force-bearing area and achieve surface contact, thereby improving the load-bearing capacity and shear resistance of the sliding rod. At the same time, it can also improve the anti-rotation effect to a certain extent, further improving the fixation effect.

[0016] Furthermore, the sliding rod is equipped with a fixation component for fixing the femoral head.

[0017] Beneficial effects: After the sliding rod is implanted, it is fixed to the femoral head through the fixation component, which can increase the connection between the sliding rod and the femoral head. The femoral head can be repositioned by using the tool to pull the sliding rod from the outside and below, reducing the displacement of the force component between the fracture ends.

[0018] Furthermore, the fixing assembly includes two fixing rods symmetrically rotatably connected to the other end of the sliding rod. The fixing rods are arranged radially along the sliding rod, and in the free state, the two ends of the fixing rods protrude from the inside and outside of the sliding rod, respectively. A reset member is provided at the connection of the fixing rods.

[0019] Beneficial effects: two fixed rods are in horizontal state in free state, and their two ends are located inside and outside the sliding rod respectively. During implantation, the sliding rod is sleeved outside the guide needle and implanted along the guide needle. During implantation, the end of the two fixed rods located inside the sliding rod abuts against the guide needle and rotates towards the inside of the sliding rod under the action of the guide needle, so that the two outer ends of the fixed rods are folded upwards, and the distance between the two outer ends of the fixed rods is smaller than the diameter of the sliding rod, thereby reducing the volume of the end of the sliding rod and facilitating the implantation of the sliding rod. After implantation, the guide needle is extracted, and the fixed rod is reset to the horizontal state by the reset member, and the outer end of the fixed rod protrudes out of the sliding rod and is inserted into the positioning rod with the same inner diameter of the sliding rod to abut against the fixed rod from the inside, thereby increasing the volume of the end of the sliding rod and expanding the sliding rod in the implantation hole, i.e. in the femoral head, so as to be fixed with the femoral head.

[0020] The structure of the present scheme is simple, the fixed rod is arranged at the end of the sliding rod to be fixed with the femoral head, and in actual application, the sliding rod can be pulled back by using a tool, so that the femoral head is pulled back by the sliding rod, the femoral head and the broken end of the femoral neck are more closely attached, i.e. the fracture line is better closed, the fixing effect is improved, and the fracture line is helped to heal faster. In addition, the fixed rod is driven to fold by the contact with the guide needle during implantation, which does not affect the implantation of the sliding rod, the positioning rod is implanted again to abut against the fixed rod after the guide needle is extracted, and the sliding rod and the femoral head are fixed, which is convenient to operate.

[0021] Further, the fixed component includes an annular air bag arranged at the upper end of the sliding rod, and the air bag is connected with a gas filling pipe.

[0022] Beneficial effects: the air bag is in a shriveled state during implantation, which facilitates the implantation of the sliding rod. After implantation, the air bag is inflated to expand, so that the sliding rod is clamped in the implantation hole, i.e. the sliding rod is expanded in the femoral head, and the fixation with the femoral head is achieved.

[0023] Further, the sliding rod includes a hollow core rod and a hollow screw, the outer wall of the screw is cut with a spiral blade, the core rod is slidingly connected in the screw, the outer wall of the end of the core rod is provided with an external spline, the inner wall of the screw is provided with an internal spline, the two ends of the external spline and the internal spline are wedge-shaped, the core rod and the screw can be fixedly connected through the external spline and the internal spline, and the end of the core rod is provided with a limiting step to prevent the core rod from being separated from the screw.

[0024] Beneficial effects: in the initial state, the internal spline and the external spline are not engaged, and during implantation by knocking the core rod, the screw can rotate into the implantation hole under the action of the spiral blade, so that the screw is tightly clamped with the femoral head and stably fixed with the femoral head. After implantation, the core rod is pulled back, so that the external spline is engaged into the internal spline, thereby realizing the fixed connection of the core rod and the screw, and realizing the fixation of the whole sliding rod. The two ends of the external spline and the internal spline are wedge-shaped, which can ensure that the core rod is smoothly pulled back and the internal spline and the external spline are smoothly engaged.

[0025] Further, the sliding sleeve is connected with a femur lateral fixing plate below, the femur lateral fixing plate is provided with positioning holes for the fixed screw to pass through, and the femur lateral fixing plate is provided with a bending part, the thickness of the bending part is less than the thickness of the rest part of the femur lateral fixing plate, and the bending part corresponds to the bending part of the femur lateral.

[0026] Beneficial effects: the femur lateral fixing plate is used for installing the fixed screw, the bending part is arranged to facilitate bending the femur lateral fixing plate from the bending part, so that the femur lateral fixing plate is bent into an arc matching the bending part of the upper end of the femur, so that the femur lateral fixing plate is more matched with the femur lateral, thereby improving the installation stability of the femur lateral fixing plate, and further improving the installation stability of the whole structure, so as to improve the effect of fracture fixation.

[0027] Further, the included angle between the sliding rod and the anti-rotation screw is 40°.

[0028] Beneficial effects: the sliding rod and the anti-rotation screw are kept at this angle of the scheme, the anti-rotation screw is basically kept in a horizontal state, the structural stability is good, and the shear resistance and the anti-rotation effect are relatively ideal.

[0029] Further, the lever top rod limiting nut is an inner and outer tooth nut, and the lever top rod limiting nut is screwed in the sliding sleeve to fix the lever top rod.

[0030] Beneficial effects: the inner and outer tooth nut can be threadedly connected with the lever top rod and the sliding sleeve, the structure is simple, and the cost is low.

[0031] Further, the end of the lever top rod limiting nut is provided with a notch.

[0032] Beneficial effects: the notch is arranged to facilitate connecting a screwdriver and other workpieces to tighten the lever top rod limiting nut, so that the installation is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a structure schematic view of the femoral neck dynamic anti-rotation system;

[0034] Figure 2 It is a structure schematic view of the embodiment one of the present application (containing the sliding rod and the fixed screw);

[0035] Figure 3 It is a partial sectional view of the embodiment one of the present application (without the fixed screw);

[0036] Figure 4 It is a structure schematic view of the embodiment two of the present application (containing the sliding rod and the fixed screw); Figure 2

[0037] Figure 5 It is a partial sectional view of the embodiment two of the present application (without the fixed screw);

[0038] Figure 6 ​A cross-sectional view of the sliding rod (including the core rod) in the third embodiment of the present application;

[0039] Figure 7 A cross-sectional view of the sliding rod (including the core rod) in the third embodiment of the present application; Figure 6 A partial structural schematic view of the core rod. DETAILED DESCRIPTION

[0040] The following will be further described in detail through specific embodiments:

[0041] The reference signs in the attached drawings of the specification include: sliding rod 1, fixed rod 11, rotating shaft 111, mounting groove 112, cavity 12, pressure-resistant surface 13, air bag 14, core rod 15, outer spline 151, limiting step 152, screw 16, inner spline 161, screw blade 162, sliding sleeve 2, femoral lateral fixing plate 21, fixing screw 22, bending part 23, positioning hole 24, lever top rod 25, lever top rod limiting nut 26, anti-rotation screw 3, power rod 4, anti-rotation nail 5, fixing nail 6.

[0042] Embodiment I:

[0043] As shown in Figure 2 and Figure 3 , the femoral neck bionic internal fixation system includes sliding sleeve 2, lever top rod 25, fixing screw 22, hollow anti-rotation screw 3, and hollow sliding rod 1. The end of sliding sleeve 2 is integrally formed with femoral lateral fixing plate 21, and the femoral lateral fixing plate 21 is provided with positioning hole 24 for the penetration of fixing screw 22, and sliding sleeve 2 is obliquely implanted in the femur. After sliding sleeve 2 is implanted in the femur, it is fixed on the femur through fixing screw 22. In this embodiment, fixing screw 22 is a full-thread self-tapping screw. The femoral lateral fixing plate 21 and the sliding sleeve 2 form an angle of 130 0 degrees, and the middle part of the femoral lateral fixing plate 21 is provided with bending part 23. After sliding sleeve 2 is implanted, bending part 23 corresponds to the bending part on the lateral outer end of the femur, and the thickness of bending part 23 is less than that of the rest of the femoral lateral fixing plate 21. This facilitates the bending of the lower part of the femoral lateral fixing plate 21 from the left and right sides of bending part 23, so as to adjust the included angle between the femoral lateral fixing plate 21 and the sliding sleeve 2, so that the femoral lateral fixing plate 21 better fits the bending part on the lateral outer end of the femur, improves the fitting degree of the femoral lateral fixing plate 21 with the femur, and increases the installation stability of the femoral lateral fixing plate 21. Figure 2 Figure 3

[0044] ​​The sliding rod 1 slides through the sliding sleeve 2, sliding along the guide pin pre-inserted into the center of the femoral neck by an external guide (not shown in the figure), allowing the sliding rod 1 to slide a certain distance within the sliding sleeve 2. A slotted hole is formed in the middle of the sliding rod 1 for the anti-rotation screw 3 to pass horizontally. The anti-rotation screw 3 is a double-ended, pressure-pressurized, hollow, self-tapping semi-threaded screw. The guide pin is inserted through the external guide (not shown in the figure) and passes through the slotted hole, horizontally implanted into the femoral head, and just breaking through the medial inferior cortex. The lever rod 25 is inserted from inside the sliding rod 1 to the anti-rotation screw 3 to press against and position it. After the lever rod 25 is in place, it is fixed within the sliding sleeve 2 by the lever rod limiting nut 26. The lever rod limiting nut 26 uses an internal and external threaded screw, with an external thread at the bottom of the lever rod 25 and an internal thread at the bottom of the sliding sleeve 2. The internal and external threaded screws are threadedly connected between the lever rod 25 and the sliding sleeve 2. In this embodiment, the included angle between the sliding rod 1 and the anti-rotation screw 3 is 40°.

[0045] The sliding rod 1 has a pressure-resistant surface 13 at its high end, which is horizontal after implantation. A fixation component for fixing the femoral head is located at the pressure-resistant surface 13, combined with... Figure 4 As shown, the fixing assembly includes two fixing rods 11. Two mounting slots 112 are symmetrically opened on the pressure-resistant surface 13. A rotating shaft 111 is fixed in each of the two mounting slots 112. The fixing rods 11 are rotatably connected to the rotating shafts 111. A torsion spring (not shown in the figure) connects the fixing rods 11 and the rotating shafts 111. In the free state, the fixing rods 11 are horizontal (parallel to the mounting slots 112). In this state, the two ends of the fixing rods 11 are located inside and outside the sliding rod 1, respectively. Figure 4 The state shown.

[0046] The specific implementation process is as follows:

[0047] The lateral femoral fixation plate 21 is bent beforehand according to the bending angle at the lateral bend of the proximal femur, forming an arc that fits against the lateral aspect of the proximal femur. Then, an external guide (not shown in the figure) is used along... Figure 2 In path A, a guide pin is inserted into the femur. After enlarging the hole, sliding rod 1 is then placed on the guide pin. An external guide (not shown in the figure) is used to guide sliding rod 1 and sliding sleeve 2 along the guide pin from the outer side of the upper end of the femur. Figure 2 The rod is inserted obliquely upwards (on the left side) until it crosses the fracture line and is implanted approximately 5-10 mm below the femoral head cartilage. In the free state, both fixation rods 11 are horizontal. Figure 4 As shown in the diagram; when the sliding rod 1 is implanted, the guide needle is inserted from the upper end of the sliding rod 1, forcing the inner ends of the two fixing rods 11 to rotate toward the inside of the sliding rod 1 and the outer ends of the fixing rods 11 to flip up and retract toward the sliding rod 1. At this time, the distance between the two fixing rods 11 is less than the diameter of the sliding rod 1, thereby enabling the sliding rod 1 to be implanted smoothly.

[0048] After the sliding rod 1 is implanted, the guide pin on path A is removed, and the fixing screw 22 is inserted to fix the sliding sleeve 2, completing the implantation of the sliding sleeve 2 and the sliding rod 1. After the guide pin on path A is removed, the repositioning device drives the fixing rod 11 to return to a horizontal state. Then, a positioning rod with the same inner diameter as the sliding rod 1 is inserted into the sliding rod 1 to press against the fixing rod 11 from the inside, thus fixing the fixing rod 11. After the fixing rod 11 is in a horizontal state, it can press against the implantation hole, thereby fixing the sliding rod 1 in the femoral head and achieving connection with the femoral head. After the sliding rod 1 is fixed, the sliding rod 1 is pulled back using an external guide (not shown in the figure), which can also pull back the femoral head, thereby reducing the fracture and ensuring the healing effect.

[0049] After the sliding rod 1 is implanted, an external guide (not shown in the figure) is used to make a hole along path B and insert a guide pin. The anti-rotation screw 3 is fitted onto the guide pin and driven horizontally along the guide pin from the lateral side of the upper end of the femur, crossing the fracture line and passing through the strip hole on the sliding rod 1, implanting into the femoral head and just breaking through the medial inferior cortex, forming a triangle with the sliding rod 1. Then, the lever top rod 25 is inserted from the sliding rod 1 until its top end is pressed against the anti-rotation screw 3, and then the lever top rod limiting nut 26 is screwed in to fix the lever top rod 25, thus completing the positioning of the anti-rotation screw 3. At this point, the implantation of this method is completed. In actual use, a notch can be made at the outer end of the lever top rod limiting nut 26 to connect with tools such as screwdrivers, so as to facilitate the screwing of the lever top rod limiting nut 26 into the sliding sleeve 2. In addition, in actual use, the length of the sliding rod 1 can be set in multiple sizes according to the patient's femoral size for corresponding treatment.

[0050] This design involves horizontally implanting the anti-rotation screw 3 and obliquely implanting the sliding rod 1. The sliding rod 1 and anti-rotation screw 3 form a triangular configuration, resulting in a larger angle, greater structural stability, and better anti-rotation effect. Furthermore, the horizontal placement of the anti-rotation screw 3 can withstand a certain degree of body weight, reducing the burden on the femur and accelerating femoral healing. In addition, two fixation rods 11 are used to fix the sliding rod 1, increasing the bonding strength between the sliding rod 1 and the femoral head. Pulling back the sliding rod 1 can also retract the femoral head, ensuring a tight fit along the fracture line and guaranteeing optimal healing.

[0051] Example 2:

[0052] like Figure 5 As shown, the difference between this embodiment and Embodiment 1 is that the fixing component is an annular airbag 14, and an annular groove is opened on the circumferential surface of the right end of the sliding rod 1. The airbag 14 is glued and fixed in the groove. The airbag 14 is connected to an inflation tube, which is embedded in the inner wall of the sliding rod 1 (not shown in the figure).

[0053] In this embodiment, the sliding rod 1 is implanted with the air bag 14 in a deflated state accommodated in the card slot, which does not affect the smooth implantation of the sliding rod 1. After the sliding rod 1 is implanted, the air bag 14 is inflated, and the air bag 14 is clamped in the implantation hole after inflation and expansion, thereby fixing the sliding rod 1 in the implantation hole and fixing the sliding rod 1 with the femoral head. The sliding rod 1 and the femoral head can be fixed in this way, and the structure is simple.

[0054] Embodiment three:

[0055] As shown in Figure 6 and Figure 7 , the difference between this embodiment and embodiment one is that the sliding rod 1 includes a hollow core rod 15 and a hollow spiral nail 16, the outer wall of the spiral nail 16 is cut with a spiral blade 162, the core rod 15 is connected in the spiral nail 16 through the core head at the end thereof, and the main body part of the core rod 15 and the diameter of the spiral nail 16 are the same. The outer spline 151 is integrally formed on the outer wall of the end of the core rod 15, the inner spline 161 is integrally formed on the inner wall of the spiral nail, and the two ends of the outer spline 151 and the inner spline 161 are wedge-shaped. The core rod 15 and the spiral nail 16 can be fixedly connected through the outer spline 151 and the inner spline 161, and the end of the core rod 15 is also integrally formed with a limiting step 152 to prevent it from being separated from the spiral nail 16.

[0056] In the initial state, the spiral nail 16 is sleeved on the end of the core rod 15, the inner spline 161 and the outer spline 151 are not engaged, that is, in the state shown in Figure 6 ; When implanted, an implantation hole with a diameter smaller than the spiral nail 16 is punched on the femoral head along path A, the head of the spiral nail 16 is aligned with the implantation hole, and the core rod 15 and the spiral nail 16 are punched into the implantation hole in the state shown in Figure 6 . Since the spiral nail 16 is only sleeved on the core rod 15 and is not engaged with the core rod 15, when the core rod 15 is knocked, the core rod 15 pushes the spiral nail 16 into the implantation hole, the spiral nail 16 cuts the implantation hole by relying on the spiral blade 162 thereon and rotates into the implantation hole under the action of the spiral blade 162 thereof, thereby tightly clamping the spiral nail 16 with the femoral head and realizing stable fixation with the femoral head. After implantation, the core rod 15 is pulled back, so that the outer spline 151 is engaged into the inner spline 161, thereby realizing the fixed connection of the core rod 15 and the spiral nail 16, and realizing the fixation of the whole sliding rod 1. The two ends of the outer spline 151 and the inner spline 161 are wedge-shaped, which can ensure that the core rod 15 is smoothly pulled back and that the inner spline 161 and the outer spline 151 are smoothly engaged.

[0057] The above-mentioned are only embodiments of the present application, and the common knowledge of specific structures and characteristics in the scheme is not described too much. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, which will not affect the effect and practicality of the patent. The protection scope claimed in this application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A femoral neck biomimetic internal fixation system, characterized in that: The application relates to a sliding sleeve, a lever top rod, an anti-rotation screw, a fixing screw and a hollow sliding rod, wherein the sliding sleeve is fixed on a femur through the fixing screw, the anti-rotation screw is horizontally arranged, the sliding sleeve and the sliding rod are obliquely arranged, one end of the sliding rod is slidably connected in the sliding sleeve, a strip-shaped hole is formed in the sliding rod and used for penetrating the anti-rotation screw, the lever top rod is used for being inserted into the sliding rod to limit and support the anti-rotation screw, and the lever top rod is connected with a lever top rod limiting nut. A fixing assembly for fixing a femoral head is arranged on the sliding rod; the fixing assembly comprises two fixing rods which are symmetrically and rotatably connected at the other end of the sliding rod, the fixing rods are arranged along the radial direction of the sliding rod and protrude out of the sliding rod at both ends in a free state, and reset members are arranged at the connecting positions of the fixing rods; or the fixing assembly comprises an annular air bag arranged at the other end of the sliding rod, and the air bag is connected with a gas filling pipe.

2. The femoral neck bionic internal fixation system according to claim 1, characterized in that: The other end of the sliding rod is provided with a pressure-resistant surface, and the pressure-resistant surface is horizontal after the sliding rod is implanted.

3. The femoral neck bionic internal fixation system according to claim 2, characterized in that: The sliding rod comprises a hollow core rod and a hollow spiral nail, spiral blades are cut on the outer wall of the spiral nail, the core rod is slidably connected in the spiral nail, an outer spline is arranged on the outer wall of the end of the core rod, an inner spline is arranged on the inner wall of the spiral nail, the two ends of the outer spline and the inner spline are wedge-shaped, the core rod and the spiral nail can be fixedly connected through the outer spline and the inner spline, and a limiting step is arranged at the end of the core rod to prevent the core rod from being separated from the spiral nail.

4. The femoral neck bionic internal fixation system according to claim 1, characterized in that: A femoral lateral fixing plate is connected below the sliding sleeve, and positioning holes for penetrating the fixing screw are formed in the femoral lateral fixing plate; a bent part is arranged on the femoral lateral fixing plate, the thickness of the bent part is smaller than that of the rest part of the femoral lateral fixing plate, and the bent part corresponds to the bending part of the lateral side of the femur.

5. The femoral neck bionic internal fixation system according to claim 1, characterized in that: The included angle between the sliding rod and the anti-rotation screw is 40 degrees.

6. The femoral neck bionic internal fixation system according to any one of claims 1-5, characterized in that: The lever top rod limiting nut is an inner and outer toothed nut, and the lever top rod limiting nut is screwed in the sliding sleeve to fix the lever top rod.

7. The femoral neck bionic internal fixation system according to claim 6, characterized in that: A notch is arranged at the end of the lever top rod limiting nut.

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