Implanter for ankle joint replacement surgery

Abstract

The invention provides an implanter for an ankle joint replacement operation, and belongs to the field of implanters for the ankle joint replacement operation. Comprising a tibia assembly and a polyethylene insert installed at the lower end of the tibia assembly, a plurality of triangular grooves are formed in the upper end and the lower end of the tibia assembly, and a plurality of triangular rod pieces are arranged at the upper end of the polyethylene insert. Under the cooperation of the marrow nail, the tibia, the driving rod, the inclined groove, the cross-shaped inclined plate, the trapezoidal block, the sliding groove and the displacement box, the trapezoidal block is in contact with the tibia, so that the friction force between the marrow nail and the tibia is increased, the stability of the tibia assembly in a human body is enhanced, the phenomenon that the tibia assembly is loosened during long-time movement is avoided, and the tibia assembly is more stable. Therefore, the daily life of the patient is affected, the service life of the implanter is further prolonged, and under the cooperation of the driving rod, the cavity, the polyethylene insert, the tibia assembly and the clamping groove, the phenomenon that the driving rod shakes in the human body in the walking or moving process of the patient is avoided.

Description

Technical Field

[0001] The present invention relates to the field of implanters for ankle joint replacement surgery, and more particularly to an implanter for ankle joint replacement surgery. Background Art

[0002] Ankle replacement surgery implant is an artificial prosthesis used to replace the diseased or damaged ankle joint, aiming to relieve pain, correct deformity and restore the normal function of the ankle joint. It includes a tibial component, a polyethylene insert and a flat-cut talar component. Ankle replacement refers to a surgical method to remove the diseased ankle joint part and implant a prosthesis into the body to replace the original ankle joint function in order to relieve pain and improve patient function. It is generally used as an ultimate treatment method when rheumatoid arthritis, ankle osteoarthritis, traumatic arthritis, etc. progress to the terminal stage, with joint swelling, pain, and immobility. It requires the patient's talus to have good morphology and function.

[0003] The lifespan of existing ankle replacement implants is approximately 5-10 years. This lifespan may be reduced for patients with osteoporosis. Moreover, the implant remains in the tibia for a long time, which increases friction between the medullary nail and the tibia when the patient exercises, thereby increasing wear on the tibia and causing loosening of the tibial component. In severe cases, the tibial component may even fall off, which greatly affects the patient's daily life and indirectly reduces the lifespan of the ankle replacement implant. Summary of the Invention

[0004] The service life of patients with osteoporosis in the existing technology may be shortened, and the implant is in the tibia for a long time, which will increase the friction between the medullary nail and the tibia when the patient exercises, thereby increasing the wear of the tibia and causing the tibial component to loosen. In severe cases, the tibial component may even fall off, which will greatly affect the patient's daily life and indirectly reduce the service life of the ankle replacement surgery implant. The purpose of the present invention is to provide an implant for ankle replacement surgery.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] An implant for ankle replacement surgery includes a tibial component and a polyethylene insert installed at the lower end of the tibial component. The upper and lower ends of the tibial component are both provided with a plurality of triangular grooves. The triangular grooves at the upper end can improve the friction between the tibial component and the tibia, and the triangular grooves at the lower end can improve the bite between the polyethylene insert and the tibial component. The upper end of the polyethylene insert is provided with a plurality of triangular rods, which just coincide with the triangular grooves, thereby increasing the bite force between the tibial component and the polyethylene insert. The lower end of the polyethylene insert is provided with a flat-cut talus component. The tibial component is provided with three fixing grooves. The three A medullary bone nail is fixedly installed on the fixing groove, and the tibial component is provided with a displacement component that increases the friction between the medullary bone nail and the tibia. The tibial component is provided with a driving component for driving the displacement component, and the medullary bone nail is provided with a pushing component that increases the contact area between the displacement component and the tibia. The pushing component can increase the contact area between the displacement component and the tibia, thereby further increasing the friction between the medullary bone nail and the tibia. The fixing groove is provided with a filling component that prevents the medullary bone nail from wearing out the periphery of the tibia due to long-term use and becoming loose. The driving component is provided with a clamping component that enhances the bite force between the tibial component and the polyethylene insert.

[0007] Optionally, the displacement assembly includes several fixing holes opened on the axial side wall of the medullary bone nail, and a displacement box is fixedly installed on each of the fixing holes. The displacement box is provided with a slide groove, and a trapezoidal block is slidably installed on the slide groove. The medullary bone nail is provided with a chamber.

[0008] Optionally, the driving assembly includes three oblique grooves provided on the tibial assembly, a driving rod is slidably mounted on each of the three oblique grooves, a cross oblique plate is fixedly mounted on one end of the driving rod, and three slots are provided on the polyethylene insert.

[0009] Optionally, the filling assembly includes a mounting box fixedly mounted on the fixing groove, the mounting box is fixedly connected to the medullary bone nail, a circular slide rail is provided on the mounting box, a filling block is slidably mounted on the circular slide rail, and a plurality of nickel-titanium alloy springs are arranged between the filling block and the circular slide rail.

[0010] Optionally, the pushing assembly includes a first mounting groove opened on the trapezoidal block, two slide rails are fixedly installed on the first mounting groove, displacement blocks are slidably installed on the two slide rails, a moving groove is opened at one end of the trapezoidal block, and a pressing block is slidably installed on the moving groove.

[0011] Optionally, the clamping assembly includes a limiting groove provided on the polyethylene insert, a cavity is provided on the driving rod, an arc block is slidably mounted on the cavity, and a second spring is provided between the arc block and the cavity.

[0012] Optionally, the inclined surface of the trapezoidal block corresponds to the inclined surface of the cross inclined plate.

[0013] Optionally, the length of the driving rod is greater than the distance from the oblique groove to the end of the medullary bone nail, and the driving rod and the medullary bone nail are coaxially arranged.

[0014] Optionally, the filling block fits against the outer wall of the medullary bone nail.

[0015] Optionally, the displacements of the three clamping slots coincide with the positions of the three oblique slots, and the sizes of the clamping slots match the sizes of the driving rod.

[0016] Compared with the prior art, the technical solution provided by the present invention has at least the following beneficial effects:

[0017] In the above scheme, with the cooperation of the medullary nail, tibia, driving rod, oblique groove, cross oblique plate, trapezoidal block, slide groove and displacement box, the trapezoidal block is brought into contact with the tibia, thereby increasing the friction between the medullary nail and the tibia, strengthening the stability of the tibial component in the human body, avoiding the loosening of the tibial component during long-term exercise, thereby affecting the patient's daily life, and further improving the service life of the implant. With the cooperation of the driving rod, chamber, polyethylene insert, tibial component and slot, the slot will limit the displacement of the driving rod, avoiding the driving rod from shaking in the human body when the patient is walking or exercising.

[0018] With the cooperation of the trapezoidal block, the slide groove and the pressing block, the tibia applies pressure to the pressing block, causing the pressing block to enter the first mounting groove. At this time, the pressing block squeezes the two displacement blocks, causing the two displacement blocks to move outward through the slide rail, thereby increasing the contact area between the trapezoidal block and the tibia, indirectly increasing the friction between the medullary bone nail and the tibia, and improving the service life of the implant.

[0019] With the cooperation of the driving rod, the slot, the arc block, the cavity, the second spring and the limit groove, not only can the driving rod be limited, but the connectivity between the tibial component and the polyethylene insert is also increased, indirectly improving the service life of the implant. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable one skilled in the art to make and use the invention.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 A partial cross-sectional view of the clamping assembly of the present invention

[0023] Figure 3is a transverse cross-sectional view of the displacement assembly of the present invention;

[0024] Figure 4 is a partial cross-sectional view of the displacement assembly of the present invention;

[0025] Figure 5 is a vertical cross-sectional view of the displacement assembly of the present invention;

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the driving component of the present invention;

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of the clamping assembly of the present invention;

[0028] Figure 8 For the present invention Figure 7 A magnified view of point A;

[0029] Figure 9 is a cross-sectional view of the push assembly of the present invention;

[0030] Figure 10 is a cross-sectional view of a packing assembly of the present invention;

[0031] Figure 11 It is a partial cross-sectional view of the packing assembly of the present invention.

[0032] [Reference Signs]

[0033] 1. Tibial component; 11. Polyethylene insert; 12. Flat-cut talar component; 13. Triangular groove; 14. Triangular rod;

[0034] 2. Displacement assembly; 21. Fixing groove; 22. Medullary bone nail; 23. Fixing hole; 24. Displacement box; 25. Slide groove; 26. Trapezoidal block; 27. Chamber;

[0035] 3. Drive assembly; 31. Inclined slot; 32. Drive rod; 33. Cross inclined plate; 34. Card slot;

[0036] 4. Filling assembly; 41. Mounting box; 42. Circular slide rail; 43. Filling block; 44. Nitinol spring;

[0037] 5. Push assembly; 51. First mounting slot; 52. Slide rail; 53. Press block; 54. Displacement block; 55. Moving slot;

[0038] 6. Clamping assembly; 61. Limiting groove; 62. Cavity; 63. Arc block; 64. Second spring.

[0039] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0040] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. It is also noted that, to provide a more detailed description, the following embodiments are best and preferred embodiments, and those skilled in the art may employ alternative methods for implementing certain known technologies. Furthermore, the accompanying drawings are intended only to provide a more detailed description of the embodiments and are not intended to limit the present invention.

[0041] It should be noted that references in the specification to "one embodiment," "an embodiment," "exemplary embodiments," "some embodiments," etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment will include such specific features, structures, or characteristics. Furthermore, when specific features, structures, or characteristics are described in conjunction with an embodiment, it is within the knowledge of persons skilled in the relevant art to implement such features, structures, or characteristics in conjunction with other embodiments (whether or not explicitly described).

[0042] In general, terms can be understood, at least in part, from their use in context. For example, depending at least in part on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending at least in part on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0043] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” means not only “directly on” something but also includes the meaning of being “on” something with intervening features or layers, and “on” or “above” means not only “on” or “above” something but also includes the meaning of being “on” or “above” something with no intervening features or layers.

[0044] Additionally, spatially relative terms such as "below," "beneath," "lower," "above," and "upper" may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as illustrated in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein should be similarly interpreted accordingly.

[0045] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides an implant for ankle replacement surgery, comprising a tibial component 1 and a polyethylene insert 11 mounted at the lower end of the tibial component 1. The tibial component 1 has a plurality of triangular grooves 13 formed at both its upper and lower ends. The triangular grooves 13 at the upper end enhance friction between the tibial component 1 and the tibia, while the triangular grooves 13 at the lower end enhance engagement between the polyethylene insert 11 and the tibial component 1. The polyethylene insert 11 has a plurality of triangular rods 14 disposed at its upper end, which mate with the triangular grooves 13, thereby increasing engagement between the tibial component 1 and the polyethylene insert 11. A flat-cut talar component 12 is disposed at its lower end. The grooves of the polyethylene insert 11 mate with the convex surface of the flat-cut talar component 12, thereby reducing friction between the polyethylene insert 11 and the flat-cut talar component 12. The flat-cut talar component 12 matches the patient's talus and can be well-fitted thereto. The tibial component 1 is provided with three fixing slots 21, each of which is fixed with a medullary bone nail 22. The medullary bone nail 22 improves fracture stability, allowing the patient to walk with weight at an earlier stage, which is beneficial for restoring joint function, reducing muscle atrophy, and reducing the risk of infection. The tibial component 1 is provided with a displacement assembly 2 that increases friction between the medullary bone nail 22 and the tibia. The displacement assembly 2 moves from the inside of the medullary bone nail 22 to the outside, increasing friction between the medullary bone nail 22 and the tibia. The tibial component 1 is provided with a driving component 3 for driving the displacement component 2. The driving component 3 can serve as a driving source for the displacement component 2 to drive the displacement component 2 to move. The medullary nail 22 is provided with a pushing component 5 for increasing the contact area between the displacement component 2 and the tibia. The pushing component 5 can increase the contact area between the displacement component 2 and the tibia, thereby further increasing the friction between the medullary nail 22 and the tibia. The fixing groove 21 is provided with a filling component 4 for preventing the medullary nail 22 from wearing out around the tibia and loosening due to long-term use. The filling component 4 can be filled according to the size of the wear, which can avoid the tibial component 1 from shaking on the tibia. The driving component 3 is provided with a clamping component 6 for enhancing the bite force between the tibial component 1 and the polyethylene insert 11.

[0046] First, anesthesia is injected into the patient's ankle joint, and then the ankle joint is detected and fixed through X-rays and measuring devices. Then, the ankle joint is cut according to the results of the X-ray, and the wound is supported to avoid loose skin during the operation. The patient's tibia is then cut into a trapezoidal shape, and then the tibial mold is placed on the newly cut part. Then, the tibia is punched through the tibial mold, and then the talus is cut, and then the talus mold is placed on the talus, and then the talus is punched. Finally, the talus component 1 is placed on the tibia. The surface of the tibial component 1 has several triangular The groove 13 can increase the friction between the tibial component 1 and the tibia, thereby reducing the sliding displacement between the tibial component 1 and the tibia. At this time, the medullary bone nail 22 is placed in the hole on the tibia for fixation, and then the polyethylene insert 11 is placed on the lower end of the tibial component 1. The triangular rod 14 on the polyethylene insert 11 is matched with the triangular groove 13, which can increase the bite force between the polyethylene insert 11 and the tibial component 1. Then, the flat-cut talar component 12 is inserted into the hole on the talus through a titanium alloy hollow tension screw for fixation. Finally, the wound is sutured to complete the ankle replacement surgery.

[0047] like Figures 3 to 9 As shown, the displacement assembly 2 includes a plurality of fixing holes 23 provided on the axial side wall of the medullary bone nail 22, and a displacement box 24 is fixedly installed on each of the fixing holes 23. The displacement box 24 is provided with a slide groove 25 (the slide groove 25 is a through groove), and a trapezoidal block 26 is slidably installed on the slide groove 25. The trapezoidal block 26 can extend outward from the slide groove 25 after being subjected to force, and a chamber 27 is provided on the medullary bone nail 22.

[0048] like Figure 3 and Figure 6 As shown, the driving assembly 3 includes three oblique grooves 31 opened on the tibial assembly. The three oblique grooves 31 and the driving rod 32 are all concentric and coaxial with the medullary nail 22 to prevent the oblique grooves 31 from affecting the path of the driving rod 32, causing the driving rod 32 to be unable to complete the driving work. The driving rod 32 is slidably installed on the three oblique grooves 31, and a cross oblique plate 33 is fixedly installed at one end of the driving rod 32. The cross oblique plate 33 just corresponds to the four trapezoidal blocks 26 and can drive the four trapezoidal blocks 26 to move outward synchronously, thereby contacting the tibia to avoid stress concentration. Three card slots 34 are provided on the polyethylene insert 11.

[0049] like Figure 9As shown, the pushing assembly 5 includes a first mounting groove 51 opened on the trapezoidal block 26, two slide rails 52 are fixedly installed on the first mounting groove 51, and displacement blocks 54 are slidably installed on the two slide rails 52. A moving groove 55 is opened at one end of the trapezoidal block 26, and a pressing block 53 is slidably installed on the moving groove 55.

[0050] like Figure 2 and Figure 8 As shown, the clamping assembly 6 includes a limiting groove 61 provided on the polyethylene insert 11 , a cavity 62 is provided on the driving rod 32 , an arc block 63 is slidably mounted on the cavity 62 , and a second spring 64 is provided between the arc block 63 and the cavity 62 .

[0051] The inclined surface of the trapezoidal block 26 corresponds to the inclined surface of the cross inclined plate 33 . When the cross inclined plate 33 contacts the trapezoidal block 26 , the resistance generated by each other can be reduced, so that the trapezoidal block 26 can smoothly contact the tibia through the fixing hole 23 .

[0052] The length of the driving rod 32 is greater than the distance from the oblique groove 31 to the end of the medullary nail 22, which enables the driving rod 32 to enter the clamping groove 34, thereby limiting the driving rod 32 and preventing the driving rod 32 from shaking. The driving rod 32 and the medullary nail 22 are concentric and coaxial, which prevents the upward displacement of the driving rod 32 from causing uneven force on the trapezoidal block 26, thereby causing uneven force on the outer wall of the medullary nail 22, and possibly forming concentrated stress on the tibia.

[0053] The displacement of the three slots 34 coincides with the position of the three oblique slots 31 . When the driving rod 32 enters the chamber 27 , the trapezoidal blocks 26 are squeezed out of the fixing holes 23 . At this time, the polyethylene insert 11 fits the upper tibial component 1 . At this time, the three slots 34 limit the driving rod 32 to prevent the driving rod 32 from shaking when the patient moves. The size of the slots 34 matches the size of the driving rod 32 . The slots 34 can well limit the driving rod 32 to prevent the driving rod 32 from shaking on the slots 34 .

[0054] When the medullary nail 22 enters the tibia, the driving rod 32 is pressed to slide on the inclined groove 31. Because the end of the driving rod 32 is a cross inclined plate 33, the inclined surface of the cross inclined plate 33 matches the inclined surface of the trapezoidal block 26, so that the friction between the cross inclined plate 33 and the trapezoidal block 26 is reduced, so that the trapezoidal block 26 moves outward from the displacement box 24 through the slide groove 25, so that the trapezoidal block 26 contacts the tibia, thereby increasing the friction between the medullary nail 22 and the tibia, and strengthening the tibial component 1 in the human body. The stability inside the cavity 27 is improved to avoid the tibial component 1 from loosening during long-term exercise, thereby affecting the patient's daily life and further improving the service life of the implant. When the driving rod 32 enters the bottom end of the cavity 27, the polyethylene insert 11 is placed on the lower end of the tibial component 1. At this time, the three driving rods 32 enter the three slots 34. The slots 34 will limit the displacement of the driving rods 32, thereby preventing the driving rods 32 from shaking in the human body when the patient walks or exercises.

[0055] When the trapezoidal block 26 moves outward through the slide groove 25, the pressing block 53 on the trapezoidal block 26 contacts the inside of the tibia, so that the tibia applies pressure to the pressing block 53, causing the pressing block 53 to enter the first mounting groove 51. At this time, the pressing block 53 squeezes the two displacement blocks 54, causing the two displacement blocks 54 to move outward through the slide rail 52, thereby increasing the contact area between the trapezoidal block 26 and the tibia, indirectly increasing the friction between the medullary bone nail 22 and the tibia, and improving the service life of the implant.

[0056] When the driving rod 32 enters the slot 34, the slot 34 will squeeze the arc block 63 into the cavity 62 until it moves to the limiting groove 61. At this time, the arc block 63 enters the limiting groove 61 through the action of the second spring 64, which not only limits the driving rod 32, but also increases the connectivity between the tibial component 1 and the polyethylene insert 11, indirectly improving the service life of the implant.

[0057] like Figure 10 and Figure 11 As shown, the stuffing assembly 4 includes a mounting box 41 fixedly mounted on the fixing groove 21, the mounting box 41 and the medullary bone nail 22 are fixedly connected, a circular slide rail 42 is provided on the mounting box 41, a stuffing block 43 is slidably mounted on the circular slide rail 42, and a plurality of nickel-titanium alloy springs 44 are provided between the stuffing block 43 and the circular slide rail 42. The nickel-titanium alloy spring 44 can "remember" its original shape at a specific temperature and restore its original shape after being deformed by external force. Nickel-titanium alloy has excellent biocompatibility and is suitable for the medical field. Under the action of the nickel-titanium alloy spring 44, the stuffing block 43 can limit the displacement of the medullary bone nail 22 to the surroundings to the greatest extent.

[0058] The stuffing block 43 fits against the outer wall of the medullary nail 22, which can avoid a gap between the stuffing block 43 and the medullary nail 22 when the stuffing block 43 comes out, thereby causing a loose filling between the stuffing block 43 and the tibia, and finally the tibial component 1 will still become loose.

[0059] When the implant is used for a long time, the tibia near the medullary bone nail 22 will inevitably wear out. If wear occurs, the tibial component 1 will become loose or even fall off. When the tibia near the medullary bone nail 22 wears out, the nickel-titanium alloy spring 44 will drive the filling block 43 to move outward on the mounting box 41. Because the front end of the filling block 43 is thin and the rear end is thick, it can just fit in the worn area. Moreover, the filling block 43 fits in with the outer wall of the medullary bone nail 22, which can avoid the existence of gaps, thereby filling the worn area and further improving the service life of the implant.

[0060] The present invention encompasses any alternatives, modifications, equivalents, and solutions that fall within the spirit and scope of the present invention. To provide a thorough understanding of the present invention, specific details are described in detail below in connection with the preferred embodiments of the present invention, but those skilled in the art will be able to fully understand the present invention without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of the present invention, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An implant for ankle replacement surgery, comprising a tibial component and a polyethylene insert mounted on the lower end of the tibial component, wherein the upper and lower ends of the tibial component are each provided with a plurality of triangular slots, the upper end of the polyethylene insert is provided with a plurality of triangular rods, and the lower end of the polyethylene insert is provided with a flat-cut talar component, the tibial component is provided with three fixing slots, each of the three fixing slots being fixedly mounted with a medullary bone nail, and characterized in that: The tibial component is provided with a displacement component that increases the friction between the medullary bone nail and the tibia, the tibial component is provided with a driving component that drives the displacement component, the medullary bone nail is provided with a pushing component that increases the contact area between the displacement component and the tibia, the fixing groove is provided with a filling component that prevents the medullary bone nail from being worn around the tibia and loosening due to long-term use, and the driving component is provided with a clamping component that enhances the bite force between the tibial component and the polyethylene insert.

2. The implant for ankle replacement surgery according to claim 1, characterized in that: The displacement assembly includes a plurality of fixing holes provided on the axial side wall of the medullary bone nail, a displacement box is fixedly installed on the plurality of fixing holes, a slide groove is provided on the displacement box, a trapezoidal block is slidably installed on the slide groove, and a cavity is provided on the medullary bone nail.

3. The implant for ankle replacement surgery according to claim 1, characterized in that: The driving assembly includes three oblique grooves opened on the tibial assembly, and driving rods are slidably mounted on the three oblique grooves. A cross oblique plate is fixedly mounted on one end of the driving rod, and three slots are provided on the polyethylene insert.

4. The implant for ankle replacement surgery according to claim 1, wherein: The stuffing assembly includes a mounting box fixedly mounted on a fixing slot, the mounting box being fixedly connected to the medullary bone nail, a circular slide rail being provided on the mounting box, a stuffing block being slidably mounted on the circular slide rail, and a plurality of nickel-titanium alloy springs being provided between the stuffing block and the circular slide rail.

5. The implant for ankle replacement surgery according to claim 2, characterized in that: The pushing assembly includes a first mounting groove provided on the trapezoidal block, two slide rails are fixedly installed on the first mounting groove, displacement blocks are slidably installed on the two slide rails, a moving groove is provided at one end of the trapezoidal block, and a pressing block is slidably installed on the moving groove.

6. The implant for ankle replacement surgery according to claim 3, characterized in that: The clamping assembly includes a limiting groove formed on the polyethylene insert, a cavity formed on the driving rod, an arc block slidably mounted on the cavity, and a second spring disposed between the arc block and the cavity.

7. The implant for ankle replacement surgery according to claim 3, characterized in that: The inclined surface of the trapezoidal block corresponds to the inclined surface of the cross inclined plate.

8. The implant for ankle replacement surgery according to claim 3, characterized in that: The length of the driving rod is greater than the distance from the oblique groove to the end of the medullary bone nail, and the driving rod and the medullary bone nail are coaxially arranged.

9. The implant for ankle replacement surgery according to claim 4, characterized in that: The filling block is in contact with the outer wall of the medullary bone nail.

10. The implant for ankle replacement surgery according to claim 3, characterized in that: The displacements of the three clamping slots coincide with the positions of the three oblique slots, and the sizes of the clamping slots match the sizes of the driving rods.

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