A knee joint condyle surface repair nail and its implantation method

Abstract

This application relates to a knee joint condyle repair nail and an implantation method thereof, belonging to the technical field of knee joint femoral condyle repair. It includes a nail head and a nail body fixedly arranged at one end of the nail head. The end of the nail head away from the nail body is provided with a bionic surface consistent with the surface structure of the human femoral condyle. The nail body is used to fix the nail head on the femoral condyle and make the bionic surface coincide with the surface of the human femoral condyle. The bionic surface on the nail head is used to repair the surface of the patient's knee joint femoral condyle, which is suitable for the treatment of patients with local damage to the femoral condyle. Moreover, the original bone mass sacrificed by the patient's femoral condyle is less, making the patient more comfortable after surgery and enabling a rapid recovery of motor ability.

Description

Technical Field

[0001] This application relates to the field of knee joint femoral condyle repair, and particularly to a knee joint condyle repair nail and an implantation method thereof. Background Art

[0002] For patients with damaged knee joint femoral condyles, generally, unicompartmental knee arthroplasty is performed using a unicompartmental knee prosthesis to relieve the patients' pain. Currently, there are already various unicompartmental knee prosthesis products on the market. When designing these unicompartmental knee prostheses, the osteotomy of the patients' knee joints is minimized as much as possible, and more original ligaments such as bilateral collateral ligaments and anterior and posterior cruciate ligaments are retained for the patients, enabling the patients to recover their motor ability faster after the operation.

[0003] However, for some patients with local damage to the knee joint femoral condyle, the degree of knee joint damage is relatively small. Although using a unicompartmental knee prosthesis product for replacement can relieve the patients' pain, it will sacrifice a relatively large amount of the patients' original bone mass, which is not conducive to the patients' recovery after the operation. Summary of the Invention

[0004] In order to relieve the pain of patients with local damage to the knee joint femoral condyle while retaining more original bone mass of the patients, this application provides a knee joint condyle repair nail and an implantation method thereof.

[0005] In a first aspect, this application provides a knee joint condyle repair nail, adopting the following technical solution:

[0006] A knee joint condyle repair nail includes a nail head and a nail body fixed at one end of the nail head. The end of the nail head away from the nail body is provided with a bionic surface that is consistent with the surface structure of the human femoral condyle. The nail body is used to embed and fix the nail head on the femoral condyle, so that the bionic surface of the nail head coincides with the surface of the human femoral condyle.

[0007] By adopting the above technical solution, when repairing the knee joint femoral condyle of a patient, first drill a hole for embedding the nail head on the knee joint femoral condyle of the patient, and then use the nail body to fix the nail head into the hole, so that the nail head is embedded on the knee joint femoral condyle of the patient. The damaged surface of the patient's femoral condyle is replaced by the bionic surface on the nail head, thereby achieving the purpose of repairing the damaged part of the patient's femoral condyle and relieving the pain of the patient; and by using the repair nail, the amount of original bone mass sacrificed at the patient's knee joint is less, enabling the patient to recover their motor ability faster.

[0008] Optionally, the nail body includes a fixing column, the circumferential surface of the fixing column is a conical surface, and the end with a larger diameter of the fixing column is fixedly connected to the end of the nail head away from the bionic surface.

[0009] By adopting the above technical solution, the inner wall of the drilled hole formed in the supracondylar femoris of the patient is also a conical surface. Then, the fixing post is inserted into the conical hole, and the conical surface on the fixing post fits with the inner wall of the conical hole. By using the frictional force between the two conical surfaces, the fixing post is fixed to the supracondylar femoris, thereby realizing the fixing effect on the nail cap. Moreover, the positioning accuracy and fixing strength of the conical surface fit are both good, which can ensure better stability of the nail cap on the supracondylar femoris of the patient.

[0010] Optionally, a guiding post is fixedly provided at one end of the fixing post away from the nail cap. The circumferential surface of the guiding post is also set as a conical surface. The end with a larger diameter of the guiding post is connected to the fixing post, and the taper of the guiding post is greater than that of the fixing post.

[0011] By adopting the above technical solution, the end area of the guiding post away from the fixing post is smaller, and it can be inserted into the drilled hole of the supracondylar femoris of the patient more smoothly, playing a guiding role for the entire nail body to be inserted into the drilled hole.

[0012] Optionally, the nail body further includes a supporting post fixedly provided at one end of the fixing post away from the nail cap, and a plurality of anti-rotation teeth fixedly provided on the supporting post. The anti-rotation teeth extend along the axial direction of the fixing post on the supporting post. All the anti-rotation teeth are spaced apart along the circumferential direction of the fixing post, and the end of the anti-rotation tooth away from the supporting post is set as a conical surface, and the conical surface of the anti-rotation tooth coincides with the conical surface of the fixing post.

[0013] By adopting the above technical solution, after the nail body is inserted into the drilled hole, the conical surface of each anti-rotation tooth will fit with the inner wall of the drilled hole in the same way as the conical surface of the fixing post. And the contact area between the anti-rotation tooth and the inner wall of the drilled hole is small, resulting in a large local pressure on the inner wall of the drilled hole by the anti-rotation tooth, improving the fixing effect of the nail body. Moreover, the anti-rotation teeth extending along the axial direction of the fixing post increase the resistance when the nail body rotates in the drilled hole, making the nail body not easy to rotate in the drilled hole, thereby ensuring the relative position stability of the bionic surface on the nail cap with respect to the original surface of the supracondylar femoris of the patient.

[0014] Optionally, the nail body includes a supporting post fixedly provided at one end of the nail cap away from the bionic surface, and a plurality of anti-rotation teeth fixedly provided on the supporting post; the plurality of anti-rotation teeth are spaced apart on the supporting post. One end of the anti-rotation tooth is fixedly connected to the end of the nail cap away from the bionic surface, and the other end extends in the direction away from the bionic surface of the nail cap. The end of the anti-rotation tooth away from the supporting post is set as a conical surface, so that the cross-sectional radius of the side of the anti-rotation tooth away from the nail cap gradually becomes smaller, and the ends of all the anti-rotation teeth are located on the same conical surface.

[0015] By adopting the above technical solution, the drill hole on the supracondylar femoris of the patient is made into a tapered hole adapted to the anti-rotation tooth conical surface. After the nail body is inserted into the tapered hole, the conical surfaces of all the anti-rotation teeth will be in contact with the inner wall of the tapered hole. The friction force generated by the cooperation of the two conical surfaces fixes the position of the anti-rotation teeth in the tapered hole, thereby realizing the fixing function of the nail cap. Moreover, the nail body in the drill hole is not easy to rotate, so that the relative position stability between the bionic surface on the nail cap and the original surface of the patient's femoral condyle is better.

[0016] Optionally, a guiding tooth is fixedly provided at one end of the anti-rotation tooth away from the nail cap. The end face of the guiding tooth away from the support column is set as a conical surface. The cross-sectional radius of the end of the guiding tooth away from the anti-rotation tooth gradually becomes smaller, and the taper of the guiding tooth is greater than the taper of the anti-rotation tooth.

[0017] By adopting the above technical solution, the guiding tooth reduces the size of the end of the anti-rotation tooth away from the nail cap, making the whole nail body easier to insert into the drill hole on the femoral condyle.

[0018] Optionally, each side edge of the anti-rotation tooth and the guiding tooth is provided with a rounded corner.

[0019] By adopting the above technical solution, the rounded corners are used to eliminate the relatively sharp parts on the nail body, making the surface of the nail body smoother and not easy to cause wear to the inner wall of the drill hole on the patient's femoral condyle.

[0020] Optionally, the nail cap is set as a rotary body structure, and the bionic surface and the nail body are respectively located at both ends of the nail cap along its own axis.

[0021] By adopting the above technical solution, the rotary body nail cap is easier to produce and manufacture. It is also more convenient to open a hole on the patient's femoral condyle to embed the nail cap, and the patient loses less original bone mass.

[0022] On the other hand, the present application provides an implantation method for a knee joint condyle surface repair nail, adopting the following technical solution: [[ID=2,2]]

[0023] An implantation method for a knee joint condyle surface repair nail, the implantation steps are as follows:

[0024] S1. Obtain the image of the patient's femoral condyle position. According to the damaged position of the patient's femoral condyle, plan the position of the main fixing column in the unicompartmental knee prosthesis during the subsequent unicompartmental knee replacement surgery. And according to the fixing position of the main fixing column, design and manufacture the nail body, the nail cap and the bionic surface on the nail cap, and make the overall size of the nail body and the nail cap smaller than the size of the main fixing column;

[0025] S2. According to the position of the main fixing column fixed on the unicompartmental knee joint planned in step S, and the sizes of the nail body and the nail cap, drill a hole on the patient's femoral condyle that is adapted to the nail body and the nail cap, so that the axis of the drill hole coincides with the axis position where the main fixing column needs to be fixed on the femoral condyle;

[0026] S3. Insert the nail body and the nail cap into the drill hole on the femoral condyle of the patient, so that the bionic surface on the nail cap coincides with the original surface of the femoral condyle of the patient.

[0027] By adopting the above technical solution, when a unicompartmental knee prosthesis is subsequently used to replace the damaged femoral condyle of the patient, since the size of the entire repair nail is smaller than the size of the fixing post on the unicompartmental knee prosthesis, during the operation, the repair nail is directly removed from the femoral condyle of the patient, and then the drill hole on the femoral condyle of the patient that cooperates with the repair nail is reamed to expand the drill hole to a size adapted to the main fixing post on the unicompartmental knee prosthesis, so that the main fixing post can be inserted into the drill hole to realize the fixation of the unicompartmental knee prosthesis. Not only does the repair nail play a positioning role for the main fixing post in the subsequent replacement operation, but also it does not affect the stability after the femoral condyle of the patient is revised using the unicompartmental knee prosthesis.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. Repair the surface of the femoral condyle of the patient's knee joint by using the bionic surface on the nail cap, which is suitable for the treatment of patients with local damage to the femoral condyle, and the original bone mass sacrificed by the femoral condyle of the patient is less, so that the comfort of the patient after the operation is better and the patient can quickly recover the motor ability;

[0030] 2. The nail body is fixed in the drill hole on the femoral condyle of the patient through the conical surface fit, and the fitting accuracy and connection strength are good. And under the action of the anti-rotation teeth, the nail body is not easy to rotate in the drill hole, effectively ensuring the stability of the relative position between the bionic surface and the original surface of the femoral condyle of the patient;

[0031] 3. The position where the nail body is implanted into the femoral condyle of the patient does not affect the stability of the unicompartmental knee prosthesis during the subsequent unicompartmental knee replacement operation for the patient, and can also locate the position of the main fixing post in the unicompartmental knee prosthesis. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic structural view of the repair nail in Embodiment 1 of the present application.

[0033] Figure 2 It is a schematic structural view of the repair nail in Embodiment 2 of the present application.

[0034] Figure 3 It is a front view of the repair nail in Embodiment 2 of the present application.

[0035] Figure 4 It shows Figure 3 A cross-sectional view taken along the line A-A in

[0036] Figure 5 It is a schematic structural view of the repair nail in Embodiment 3 of the present application.

[0037] Figure 6 It is a front view of the repair nail in Example 3 of the present application.

[0038] Figure 7 It is a structural diagram showing the relationship between the size of the repair nail and the unicompartmental knee prosthesis.

[0039] Explanation of the accompanying reference numerals: 1. nail cap; 11. bionic surface; 2. nail body; 21. fixed column; 22. guide column; 23. support column; 231. flat cut surface; 24. anti-rotation tooth; 241. guide tooth; 3. bionic body; 31. main fixed column; 32. auxiliary fixed column. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-7 This application is described in further detail.

[0041] The embodiment of the present application discloses a knee joint condyle repair nail.

[0042] Example 1

[0043] Reference Figure 1 The repair nail includes a nail cap 1 and a nail body 2. The nail body 2 is used to fix the nail cap 1 to the femoral condyle of the patient's knee joint, and the nail cap 1 is used to repair the damaged surface of the femoral condyle to achieve the purpose of relieving the patient's pain.

[0044] Reference Figure 1 In this embodiment, the nail cap 1 has a cylindrical structure, and one end face of the nail cap 1 along its own axial direction is set as a bionic surface 11. The nail body 2 is fixed at the end of the nail cap 1 away from the bionic surface 11. The bionic surface 11 is designed and manufactured according to the surface structure of the patient's femoral condyle, so that the bionic surface 11 is consistent with the original surface structure of the damaged position of the femoral condyle.

[0045] When fixing the nail cap 1 to the patient's femoral condyle, first drill a hole on the patient's femoral condyle, and then use the nail body 2 to embed the nail cap 1 into the drilled hole so that the bionic surface 11 on the nail cap 1 coincides with the surface of the patient's femoral condyle, thereby repairing the damaged position of the patient's femoral condyle.

[0046] Reference Figure 1 In this embodiment, the nail body 2 includes a fixing post 21 and a guide post 22. Both the fixing post 21 and the guide post 22 are truncated cone-shaped, with their circumferential surfaces being tapered. The end of the fixing post 21 with the largest diameter is fixedly connected to the end of the nail cap 1 facing away from the biomimetic surface 11. The axis of the fixing post 21 coincides with the axis of the nail cap 1, and the maximum cross-sectional diameter of the fixing post 21 is smaller than the end diameter of the nail cap 1.

[0047] When drilling the femoral condyle of a patient, first drill a tapered hole on the femoral condyle that is adapted to the fixing post 21, then ream the opening position of the tapered hole to a counterbore that is adapted to the size of the nail cap 1. Then insert the nail body 2 and the nail cap 1 into the entire drilled hole, so that the nail cap 1 is embedded in the counterbore, and the bionic surface 11 on the nail cap 1 coincides with the original surface of the femoral condyle. At the same time, the tapered surface of the fixing post 21 fits against the inner wall of the tapered hole on the femoral condyle, and the friction between the fixing post 21 and the inner wall of the femoral condyle tapered hole is used to fix the nail body 2 and the nail cap 1. Moreover, the positioning accuracy and fixing effect of the tapered surface fit are both good, making the fixing effect of the position of the bionic surface 11 on the nail cap 1 better.

[0048] Refer to Figure 1 , the maximum cross-sectional diameter of the guiding post 22 is the same as the minimum cross-sectional diameter of the fixing post 21, and the end with the largest diameter of the guiding post 22 is fixedly connected to the end of the fixing post 21 away from the nail cap 1. The axes of the guiding post 22 and the fixing post 21 coincide, and the taper of the guiding post 22 is greater than the taper of the fixing post 21, so that the end area of the guiding post 22 away from the fixing post 21 is smaller and it is easier to enter the drilled hole on the femoral condyle of the patient, playing a guiding role for the entire nail body 2 to enter the drilled hole.

[0049] The nail body 2 and the nail cap 1 are integrally formed by 3D printing, making the overall structural strength of the repair nail relatively high, which is also beneficial to the design and processing of the bionic surface 11 and is conducive to the bionic surface 11 matching the original surface structure of the femoral condyle of the patient.

[0050] The implementation principle of Embodiment 1 of this application is as follows: When treating a patient with local damage to the femoral condyle of the knee joint using a repair nail, first drill a hole on the femoral condyle that is adapted to the nail body 2 and the nail cap 1, and then insert the nail body 2 and the nail cap 1 into the hole, so that the bionic surface 11 on the nail cap 1 coincides with the original surface of the femoral condyle, in order to achieve the purpose of repairing the damaged position on the surface of the patient's femoral condyle. For the patient, the method of repairing the femoral condyle using a repair nail, compared with directly replacing the femoral condyle of the patient with a unicompartmental knee prosthesis, the patient's femoral condyle loses less original bone mass, retains more original bone mass, enabling the patient to recover the original motor ability faster and is more suitable for treating patients with local damage to the knee joint.

[0051] Embodiment 2

[0052] The difference between this embodiment and Embodiment 1 lies in the different structure of the nail body 2.

[0053] Refer to Figure 2 and Figure 3, in this embodiment, the nail body 2 includes a support column 23 and a plurality of anti-rotation teeth 24. The support column 23 is of a cylindrical structure. One end of the support column 23 along its own axis is fixedly connected to the end of the nail cap 1 away from the bionic surface 11. The axis of the support column 23 coincides with the axis of the nail cap 1, and the diameter of the support column 23 is smaller than the diameter of the nail cap 1.

[0054] Refer to Figure 2 and Figure 3 , in this embodiment, the number of the anti-rotation teeth 24 is six. Of course, the number of the anti-rotation teeth 24 is not limited to six, and it can be more or less than six. All the anti-rotation teeth 24 are evenly spaced along the circumferential direction of the support column 23. Each anti-rotation tooth 24 is integrally formed on the support column 23. The anti-rotation teeth 24 are arranged radially along the support column 23. One end of the anti-rotation tooth 24 is fixedly connected to the end face of the nail cap 1 away from the bionic surface 11, and the other end extends along the axis of the support column 23 in a direction away from the nail cap 1. The end face of the anti-rotation tooth 24 away from the axis of the support column 23 is a conical surface. The end face of the anti-rotation tooth 24 gradually inclines towards the direction close to the axis of the support column 23 as it moves away from the nail cap 1, and the radius of the end of the anti-rotation tooth 24 connected to the nail cap 1 is smaller than the radius of the nail cap 1.

[0055] After a conical hole and a counterbore are formed in the femoral condyle of the patient, the conical surface of the anti-rotation tooth 24 on the nail body 2 is fitted to the inner wall of the conical hole. Similarly, the nail cap 1 is fixed in the counterbore by using the conical surface fitting method. At the same time, under the action of the anti-rotation teeth 24, the resistance of the nail body 2 rotating around its own axis in the conical hole is increased, so that the nail body 2 is not easily rotated around its own axis in the conical hole. Since the bionic surface 11 is mainly designed according to the original surface shape of the patient's femoral condyle and is not an ordinary arc surface, the bionic surface 11 has directionality, and the design of the anti-rotation teeth 24 can ensure the stable direction of the bionic surface 11 after being implanted into the patient's femoral condyle.

[0056] Refer to Figure 2 and Figure 3 , a guiding tooth 241 is fixedly provided at the end of each anti-rotation tooth 24 away from the nail cap 1. The guiding tooth 241 is also fixedly provided on the circumferential surface of the support column 23, and the end face of the guiding tooth 241 away from the axis of the support column 23 is also a conical surface. The taper of the guiding tooth 241 is greater than the taper of the anti-rotation tooth 24, so that one end of the guiding tooth 241 away from the anti-rotation tooth 24 gradually inclines towards one side of the axis of the support column 23 until the guiding tooth 241 coincides with the circumferential surface of the end of the support column 23 away from the nail cap 1. The guiding tooth 241 reduces the overall area of the end of the nail body 2 away from the nail cap 1, making it easier for the end of the nail body 2 to be inserted into the drilled hole of the femoral condyle, and playing a guiding role when the entire nail body 2 enters the conical hole on the femoral condyle.

[0057] Refer to Figure 3 and Figure 4, a flat cut surface 231 is provided at a position on the circumferential surface of the support column 23 between every two adjacent anti-rotation teeth 24, increasing the connection area between the support column 23 and the anti-rotation teeth 24 and the guiding teeth 241, making the structural strength of the anti-rotation teeth 24 and the guiding teeth 241 and the connection strength with the support column 23 better. Moreover, each side edge of the anti-rotation teeth 24 and the guiding teeth 241 is provided with a rounded corner, eliminating the sharp parts on the anti-rotation teeth 24 and not easily scratching the inner wall of the conical hole of the patient's femoral condyle.

[0058] The implementation principle of Embodiment 2 is as follows: By using the design of the anti-rotation teeth 24, on the premise of satisfying the fixation of the nail cap 1 to the patient's femoral condyle, the entire repair nail can be prevented from rotating in the drill hole, thereby ensuring the relative position stability between the bionic surface 11 and the original surface of the patient's femoral condyle, and improving the fixation effect of the repair nail on the femoral condyle and the repair effect of the bionic surface 11 on the patient's femoral condyle.

[0059] Embodiment 3

[0060] The structure of the nail body 2 in this embodiment is different from that of the nail body 2 in both Embodiment 1 and Embodiment 2.

[0061] Referring to Figure 5 and Figure 6 , in this embodiment, the nail body 2 includes a fixing column 21, a support column 23 and a plurality of anti-rotation teeth 24. The fixing column 21 is fixedly arranged at one end of the nail cap 1 away from the bionic surface 11, the support column 23 is fixedly arranged at one end of the fixing column 21 away from the nail cap 1, and all the anti-rotation teeth 24 are fixedly arranged on the support column 23.

[0062] Referring to Figure 5 and Figure 6 , wherein, the structure of the fixing column 21 is the same as that of the fixing column 21 in Embodiment 1, the structures of the support column 23 and the anti-rotation teeth 24 are the same as those of the support column 23 and the anti-rotation teeth 24 in Embodiment 2, and the diameter of the support column 23 is smaller than the minimum diameter of the fixing column 21. The axis of the support column 23 coincides with the axis of the fixing column 21. One end of the anti-rotation teeth 24 is fixedly connected to the end face of the fixing column 21 away from the nail cap 1, and the conical surface of the anti-rotation teeth 24 coincides with the conical surface of the fixing column 21. One end of each anti-rotation teeth 24 away from the fixing column 21 is also fixedly provided with the above-mentioned guiding teeth 241.

[0063] The implementation principle of Embodiment 3 is as follows: After the nail body 2 is inserted into the conical hole opened on the patient's femoral condyle, the conical surface of the fixing column 21 fits with the inner wall of the conical hole, and the conical surface on the anti-rotation teeth 24 also fits with the inner wall of the conical hole. The contact area between the conical surface of the fixing column 21 and the inner wall of the conical hole is large, and the fixing effect is good. The anti-rotation teeth 24 can also prevent the entire nail body 2 from rotating. Thus, through the mutual cooperation of the fixing column 21 and the anti-rotation teeth 24, the fixing effect of the entire repair nail is better, and the stability of the bionic surface 11 is better.

[0064] An embodiment of the present application also discloses an implantation method for a knee joint repair nail.

[0065] Since any prosthesis implanted in the human body has a service life, the repair nail can only be used for the transitional use of repairing the femoral condyle of the patient's knee joint. After a long time of implanting the repair nail, the surface of the femoral condyle of the patient's knee joint will still be continuously damaged, and the patient still needs to undergo a unicompartmental knee arthroplasty to further repair the femoral condyle. Using the repair nail can make the patient have a better sense of comfort during the transition period before the unicompartmental knee arthroplasty.

[0066] Refer to Figure 7 , a common unicompartmental knee joint prosthesis includes a bionic body 3, a main fixing column 31 and a secondary fixing column 32. The main fixing column 31 and the secondary fixing column 32 are both fixed on the bionic body 3. During use, the main fixing column 31 and the secondary fixing column 32 are both fixed on the femoral condyle of the patient, and the surface of the bionic body 3 is used to replace the original surface of the femoral condyle of the patient.

[0067] In order to ensure that during the subsequent unicompartmental knee arthroplasty, the position of the repair nail on the femoral condyle does not affect the fixation of the main fixing column 31 and the secondary fixing column 32 on the femoral condyle, the implantation steps of the repair nail are as follows:

[0068] S1. Use CT or MRI to obtain an image of the femoral condyle of the patient's knee joint. According to the damaged position on the surface of the patient's femoral condyle, plan the relative position of the main fixing column 31 in the unicompartmental knee joint prosthesis relative to the femoral condyle during the unicompartmental knee arthroplasty.

[0069] Then, based on the damaged position on the surface of the patient's femoral condyle and the position of the main fixing column 31 in the unicompartmental knee joint prosthesis, design the nail body 2, the nail cap 1 and the bionic surface 11 on the nail cap 1 of the repair nail, and use 3D printing technology to manufacture the repair nail, and make the diameter of the nail cap 1 smaller than the diameter of the main fixing column 31, and the total length of the nail cap 1 and the nail body 2 in the axial direction is smaller than the total length of the main fixing column 31, so that the size of the entire repair nail is smaller than the size of the main fixing column 31.

[0070] S2. According to the position where the main fixing column 31 needs to be fixed on the femoral condyle obtained in step S1, first drill a tapered hole on the femoral condyle of the patient that is adapted to the nail body 2, and then ream the opening of the tapered hole to obtain a counterbore with the same size as the nail cap 1. At the same time, the axes of the tapered hole and the counterbore are both the same as the axis where the main fixing column 31 needs to be fixed on the femoral condyle.

[0071] S3. Implant the repair nail into the drilled hole, so that the nail body 2 is matched with the tapered hole and the nail cap 1 is matched with the counterbore, and make the bionic surface 11 on the nail cap 1 coincide with the original surface structure of the femoral condyle of the patient.

[0072] Since the fixing direction of the repair nail on the femoral condyle of the patient's knee joint is the same as the fixing direction required for the main fixing column 31 in the subsequent unicompartmental knee prosthesis to be fixed on the femoral condyle of the patient, and the size of the repair nail is smaller than that of the main fixing column 31, therefore, during the subsequent unicompartmental knee replacement surgery for the patient, the repair nail can be directly removed from the femoral condyle of the patient, and then the hole on the femoral condyle can be reamed to be adapted to the size of the main fixing column 31, so that the repair nail will not affect the stability during the future revision of the femoral condyle of the patient using the unicompartmental knee prosthesis.

[0073] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A knee joint condyle repair nail, characterized in that: It includes a nail head (1) and a nail body (2) fixedly arranged at one end of the nail head (1). The end of the nail head (1) away from the nail body (2) is provided with a bionic surface (11) consistent with the surface structure of the human femoral condyle. The nail body (2) is used to embed and fix the nail head (1) on the femoral condyle, so that the bionic surface (11) of the nail head (1) coincides with the surface of the human femoral condyle. The nail body (2) includes a fixing column (21). The circumferential surface of the fixing column (21) is set as a conical surface. The end with a larger diameter of the fixing column (21) is fixedly connected to the end of the nail head (1) away from the bionic surface (11). A guiding column (22) is fixedly arranged at the end of the fixing column (21) away from the nail head (1). The circumferential surface of the guiding column (22) is also set as a conical surface. The end with a larger diameter of the guiding column (22) is connected to the fixing column (21), and the taper of the guiding column (22) is greater than the taper of the fixing column (21). The nail body (2) further includes a supporting column (23) fixedly arranged at the end of the fixing column (21) away from the nail head (1), and a plurality of anti-rotation teeth (24) fixedly arranged on the supporting column (23). The anti-rotation teeth (24) extend along the axial direction of the fixing column (21) on the supporting column (23). All the anti-rotation teeth (24) are spaced apart along the circumferential direction of the fixing column (21). The end of the anti-rotation tooth (24) away from the supporting column (23) is set as a conical surface, and the conical surface of the anti-rotation tooth (24) coincides with the conical surface of the fixing column (21). A guiding tooth (241) is fixedly arranged at the end of the anti-rotation tooth (24) away from the nail head (1). The end face of the guiding tooth (241) away from the supporting column (23) is set as a conical surface. The cross-sectional radius of the end of the guiding tooth (241) away from the anti-rotation tooth (24) gradually becomes smaller, and the taper of the guiding tooth (241) is greater than the taper of the anti-rotation tooth (24). Each side edge of the anti-rotation tooth (24) and the guiding tooth (241) is set as a rounded corner. The bionic surface (11) has directionality.

2. The knee joint condyle repair nail according to claim 1, wherein: The nail body (2) includes a supporting column (23) fixedly arranged at the end of the nail head (1) away from the bionic surface (11), and a plurality of anti-rotation teeth (24) fixedly arranged on the supporting column (23). The plurality of anti-rotation teeth (24) are spaced apart on the supporting column (23). One end of the anti-rotation tooth (24) is fixedly connected to the end of the nail head (1) away from the bionic surface (11), and the other end extends in the direction away from the bionic surface (11) of the nail head (1). The end of the anti-rotation tooth (24) away from the supporting column (23) is set as a conical surface, so that the cross-sectional radius of the side of the anti-rotation tooth (24) away from the nail head (1) gradually becomes smaller, and the ends of all the anti-rotation teeth (24) are located on the same conical surface.

3. The knee joint condyle repair nail according to claim 1, characterized in that: The nail head (1) is set as a rotary body structure. The bionic surface (11) and the nail body (2) are respectively located at both ends of the nail head (1) along its own axis.

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