Femoral condyle prosthesis and knee joint prosthesis

Abstract

The femoral condyle prosthesis comprises a main body and a rear side cushion block, the main body comprises a front condyle part, a far end part and a rear condyle part, the front condyle part, the far end part and the rear condyle part are sequentially connected, the rear side cushion block is arranged on the side, facing the thighbone of the human body, of the rear condyle part, and the rear side cushion block is arranged on the side, facing the thighbone of the human body, of the rear condyle part. The position, relative to the posterior condyle part, of the rear side cushion block is adjustable in the thickness direction of the posterior condyle part. A doctor can adaptively adjust the position of the rear side cushion block in the femoral condyle prosthesis according to the osteotomy condition of the distal femur of the human body in an operation, so that the femoral condyle prosthesis abuts against the distal femur of the human body and is pressurized and fixed, initial stability of the non-bone cement type femoral condyle prosthesis is achieved, and bone ingrowth in the later period is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, in particular to a femoral condyle prosthesis and a knee joint prosthesis. Background Art

[0002] With the aging of the population, the use of knee replacement surgery has increased significantly. Currently, knee prostheses used in knee replacement surgery can be divided into two types: cemented and uncemented. Cementless knee prostheses are spray-coated on the inner surface of the femur, creating a porous structure that tightly bonds to the bone, achieving long-term bone ingrowth and biological fixation. These prostheses are increasingly used in clinical practice.

[0003] In clinical practice, when doctors perform osteotomies on the human femur, osteotomy deviation is prone to occur, resulting in a gap between the femoral condyle prosthesis and the osteotomy surface of the distal femur. For bone cement-based femoral condyle prostheses, this gap can be filled by injecting bone cement. However, for non-bone cemented knee prostheses, since the non-bone cemented femoral condyle prosthesis needs to fit closely with the osteotomy surface of the distal femur during implantation, if there is a gap between the non-bone cemented femoral condyle prosthesis and the osteotomy surface of the distal femur, a press fit cannot be achieved, resulting in the inability to achieve initial stability and the inability to achieve long-term bone ingrowth and biological fixation. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention proposes a femoral condyle prosthesis, which can adaptively adjust the position of the posterior pad according to the osteotomy of the distal femur of the human body, so that the femoral condyle prosthesis can abut and be pressurized and fixed with the distal femur of the human body, which is conducive to achieving the initial stability of the non-bone cement femoral condyle prosthesis and is conducive to later bone ingrowth.

[0006] The femoral condyle prosthesis of an embodiment of the present invention includes: a main body, which includes an anterior condyle, a distal end and a posterior condyle, and the anterior condyle, the distal end and the posterior condyle are connected in sequence; a posterior pad, which is arranged on the side of the posterior condyle facing the human femur, and the position of the posterior pad relative to the posterior condyle along the thickness direction of the posterior condyle is adjustable.

[0007] According to the femoral condyle prosthesis of an embodiment of the present invention, since the posterior pad is arranged on the side of the posterior condyle facing the human femur, the position of the posterior pad relative to the posterior condyle along the thickness direction of the posterior condyle is adjustable. When the femoral condyle prosthesis is implanted into the distal end of the human femur, the doctor can adaptively adjust the relative position of the posterior pad and the posterior condyle according to the fit between the osteotomy surface of the distal end of the human femur and the femoral condyle prosthesis, so that the posterior pad is abutted and pressurized and fixed with the distal end of the human femur, thereby achieving initial stability of the non-bone cement femoral condyle prosthesis, facilitating later bone ingrowth, improving the long-term stability of the femoral condyle prosthesis after implantation, and fewer adverse reactions in patients.

[0008] Optionally, the posterior condyle portion includes a posterior condyle osteotomy surface and a posterior chamfered osteotomy surface, the distal portion has a distal osteotomy surface, the posterior condyle osteotomy surface, the posterior chamfered osteotomy surface and the distal osteotomy surface are connected in sequence, and the posterior pad is arranged on at least one of the posterior condyle osteotomy surface and the posterior chamfered osteotomy surface.

[0009] Optionally, the posterior pad includes a posterior condyle pad and a posterior chamfered pad, the posterior condyle pad and the posterior chamfered pad are independent of each other, the posterior condyle pad is arranged on the posterior condyle osteotomy surface, and the posterior chamfered pad is arranged on the posterior chamfered osteotomy surface.

[0010] Optionally, the posterior condyle portion includes a left posterior condyle and a right posterior condyle, and the left posterior condyle and the right posterior condyle are arranged at intervals along the left-right direction of the posterior condyle portion. There are two posterior condyle pads and two posterior chamfered pads, one posterior condyle pad and one posterior chamfered pad are arranged on the left posterior condyle, and the other posterior condyle pad and the other posterior chamfered pad are arranged on the right posterior condyle.

[0011] Optionally, the side of the posterior condyle facing the human femur has a mounting groove, part of the posterior pad is arranged in the mounting groove, and the other part of the posterior pad is located outside the mounting groove.

[0012] Optionally, the femoral condyle prosthesis includes an adjusting member, which is arranged in the posterior condyle, and at least part of the adjusting member is arranged between the posterior pad and the bottom of the mounting slot, and the adjusting member is used to adjust the position of the posterior pad along the thickness direction of the posterior condyle.

[0013] Optionally, the femoral condyle prosthesis includes a positioning member, which is arranged in the posterior condyle, and at least a portion of the positioning member cooperates with the posterior pad to limit the posterior pad from being separated from the mounting groove.

[0014] Optionally, the adjusting member includes a conical section and a threaded section, and the cross-sectional profile of the conical section gradually decreases in the direction from the threaded section to the conical section. The threaded section is threadedly engaged in the outer edge of the mounting groove, and the conical section is located between the posterior pad and the bottom of the mounting groove. Rotating the adjusting member can move the posterior pad along the thickness direction of the posterior condyle.

[0015] Optionally, the positioning piece is fixedly connected to the outer edge of the mounting groove, the positioning piece is a cylinder, and the rear pad is provided with a mating hole that cooperates with the positioning piece, the cross-sectional profile of the mating hole is a strip, and the long side of the strip-shaped mating hole extends along the thickness direction of the rear pad, so that the rear pad can move relative to the positioning piece along the thickness direction of the posterior condyle.

[0016] Optionally, the threaded segment has a first end and a second end opposite to each other along its axial direction, the conical segment is connected to the first end, and the second end has a tool hole.

[0017] Optionally, there are at least two positioning members.

[0018] Optionally, the distal end portion has a distal osteotomy surface, a support portion is provided on the distal osteotomy surface, and the support portion is plate-shaped, with a long side of the plate-shaped support portion extending along the anterior-posterior direction of the femoral condyle prosthesis.

[0019] Optionally, there are two supporting portions, and the two supporting portions are arranged at intervals along the left-right direction of the distal end portion.

[0020] Optionally, a dimension of the support portion along the left-right direction of the distal end portion is L1, wherein 1.5 mm ≤ L1 ≤ 6 mm.

[0021] Optionally, a dimension of the support portion along a thickness direction of the distal end portion is L2, wherein 6 mm ≤ L2 ≤ 30 mm.

[0022] Optionally, a dimension of the support portion along the anterior-posterior direction of the femoral condyle prosthesis gradually decreases in a direction away from the distal osteotomy surface.

[0023] Optionally, the support portion has a first side close to the distal osteotomy surface and a second side away from the distal osteotomy surface, the first side has a size L3 along the anterior-posterior direction of the femoral condyle prosthesis, and the second side has a size L4 along the anterior-posterior direction of the femoral condyle prosthesis, wherein 10mm≤L3≤40mm, 0mm≤L4≤20mm.

[0024] Optionally, a porous structure is provided on the side of at least one of the anterior condyle, the distal end, the posterior condyle, and the posterior pad facing the human femur and on the outer wall surface of the support portion.

[0025] A knee joint prosthesis according to another embodiment of the present invention includes: a femoral condyle prosthesis, wherein the femoral condyle prosthesis is the femoral condyle prosthesis described in any one of the embodiments of the present invention; a tibial pad and a tibial tray, wherein the tibial pad is provided between the tibial tray and the femoral condyle prosthesis. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 1 is an assembly diagram of a femoral condyle prosthesis and a distal femur according to an embodiment of the present invention.

[0027] Figure 2 The femoral condyle prosthesis of the embodiment of the present invention is a three-dimensional Figure 1 .

[0028] Figure 3 FIG. 4 is a side view of a femoral condyle prosthesis according to an embodiment of the present invention.

[0029] Figure 4 is a cross-sectional view of a femoral condyle prosthesis according to an embodiment of the present invention.

[0030] Figure 5 FIG. 4 is an exploded view of a femoral condyle prosthesis according to an embodiment of the present invention.

[0031] Figure 6 It is a partial cross-sectional view of a femoral condyle prosthesis according to an embodiment of the present invention.

[0032] Figure 7 The femoral condyle prosthesis of the embodiment of the present invention is a three-dimensional Figure 2 .

[0033] Figure 8 It is a stereoscopic view of a posterior condylar spacer of a femoral condylar prosthesis according to an embodiment of the present invention.

[0034] Figure 9 4 is a side view of a posterior condylar spacer of a femoral condylar prosthesis according to an embodiment of the present invention.

[0035] Figure 10 Schematic diagram of the posterior condylar pad of the femoral condylar prosthesis according to an embodiment of the present invention from another perspective.

[0036] Figure 11 4 is a side view of a posterior chamfered pad of a femoral condyle prosthesis according to an embodiment of the present invention.

[0037] Figure 12 1 is a schematic diagram of a posterior chamfered pad of a femoral condyle prosthesis from another perspective according to an embodiment of the present invention.

[0038] Figure 13 It is a front view of the adjusting component of the femoral condyle prosthesis according to an embodiment of the present invention.

[0039] Figure 14 It is a stereoscopic view of an adjusting member of a femoral condyle prosthesis according to an embodiment of the present invention.

[0040] Reference numerals: 1. Main body; 11. Anterior condyle; 111. Anterior condyle osteotomy surface; 112. Anterior chamfered osteotomy surface; 12. Distal end; 121. Distal osteotomy surface; 13. Posterior condyle; 131. Posterior condyle osteotomy surface; 132. Posterior chamfered osteotomy surface; 133. Left posterior condyle; 134. Right posterior condyle; 135. Mounting slot; 136. Positioning hole; 137. Threaded hole; 138. Avoidance hole; 2. Posterior pad; 21. Posterior condyle pad; 22. Posterior chamfer pad; 23. Matching hole; 24. Arc groove; 3. Adjusting member; 31. Conical section; 32. Threaded section; 321. First end; 322. Second end; 3221. Tool hole; 4. Positioning parts; 5. Support portion; 51. First side; 52. Second side; 6. Porous structure; 7. Femur. DETAILED DESCRIPTION

[0041] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0042] Please refer to the following Figures 1 to 14 A femoral condyle prosthesis and a knee joint prosthesis according to embodiments of the present invention are described.

[0043] The femoral condyle prosthesis of the embodiment of the present invention includes a main body 1 and a posterior spacer 2. The main body 1 includes an anterior condyle 11, a distal portion 12, and a posterior condyle 13. The anterior condyle 11, the distal portion 12, and the posterior condyle 13 are sequentially connected. The posterior spacer 2 is disposed on the side of the posterior condyle 13 facing the human femur 7. The position of the posterior spacer 2 relative to the posterior condyle 13 along the thickness direction of the posterior condyle 13 is adjustable. It is understood that the position of the posterior spacer 2 is adjustable in a direction toward the osteotomy surface of the human femur 7 or away from the osteotomy surface of the human femur 7.

[0044] According to the femoral condyle prosthesis of an embodiment of the present invention, since the posterior pad 2 is arranged on the side of the posterior condyle 13 facing the human femur 7, and the position of the posterior pad 2 relative to the posterior condyle 13 along the thickness direction of the posterior condyle 13 is adjustable, when the position of the posterior pad 2 is adjusted in the direction away from the posterior condyle 13, the posterior pad 2 can drive the femoral condyle prosthesis to move toward the distal end of the human femur 7, so as to clamp the distal end of the human femur 7 through the posterior condyle 13 and the posterior pad 2, thereby achieving initial stability of the femoral condyle prosthesis. Therefore, when the femoral condyle prosthesis is implanted into the distal end of the human femur 7, the doctor can adaptively adjust the relative positions of the posterior pad 2 and the posterior condyle 13 according to the fit between the osteotomy surface of the distal end of the human femur 7 and the femoral condyle prosthesis, so that the posterior pad 2 is abutted and pressurized against the distal end of the human femur 7, thereby achieving the initial stability of the non-bone cement femoral condyle prosthesis, facilitating the later bone ingrowth, improving the long-term stability of the femoral condyle prosthesis after implantation, and causing fewer adverse reactions in patients.

[0045] In addition, since the inner surface of the cementless femoral condyle prosthesis is porous and does not require bone cement for filling and fixation, during surgery, the cementless femoral condyle prosthesis needs to be interference-fitted with the human femur 7 to achieve initial stability and later bone ingrowth. Therefore, when the doctor implants the cementless femoral condyle prosthesis that has an interference fit with the human femur 7, the rough porous surface on the inner side of the femoral condyle prosthesis will inevitably damage the human femur 7. However, when the femoral condyle prosthesis of the embodiment of the present invention is implanted, a certain gap is reserved between the anterior condyle 11 and the posterior condyle 13 of the femoral condyle prosthesis and the human femur 7. After implantation, the doctor can subsequently adjust the position of the posterior pad 2 to achieve an interference fit between the femoral condyle prosthesis and the human femur 7. Therefore, the femoral condyle prosthesis of the embodiment of the present invention can avoid damaging the human femur during implantation.

[0046] In addition, if the doctor needs to revise the femoral condyle prosthesis later, he can also adjust the posterior pad 2 to move the posterior pad 2 in a direction away from the distal end of the human femur 7, so that the posterior pad 2 is separated from the human femur 7 by a certain distance. This can facilitate the loosening of the femoral condyle prosthesis from the human femur 7, making it easier for the doctor to remove the femoral condyle prosthesis.

[0047] like Figures 1 to 4 As shown, the posterior condyle portion 13 of the embodiment of the present invention includes a posterior condyle osteotomy surface 131 and a posterior chamfered osteotomy surface 132, the distal portion 12 has a distal osteotomy surface 121, the posterior condyle osteotomy surface 131, the posterior chamfered osteotomy surface 132 and the distal osteotomy surface 121 are connected in sequence, and the posterior pad 2 is provided on at least one of the posterior condyle osteotomy surface 131 and the posterior chamfered osteotomy surface 132.

[0048] Preferably, the doctor can choose to place one posterior pad 2 on the posterior condyle osteotomy surface 131 and the other posterior pad 2 on the posterior chamfered osteotomy surface 132 according to the osteotomy condition of the distal end of the human femur 7. In this way, the contact area between the posterior pad 2, the posterior condyle 13 and the human femur 7 can be increased, thereby improving the stability and reliability of the femoral condyle prosthesis position adjustment.

[0049] In other embodiments, the doctor may also choose to place only the posterior pad 2 on the posterior condyle osteotomy surface 131 according to the osteotomy condition of the distal end of the human femur 7. For another example, the posterior pad 2 is placed on the posterior chamfered osteotomy surface 132.

[0050] Exemplarily, the left and right widths of the rear pad 2 are between 15 mm and 30 mm, and the thickness of the rear pad 2 is between 3 mm and 7 mm.

[0051] like Figures 2 to 5 As shown, the posterior spacer 2 of the embodiment of the present invention includes a posterior condyle spacer 21 and a posterior chamfered spacer 22. The posterior condyle spacer 21 and the posterior chamfered spacer 22 are independent of each other. The posterior condyle spacer 21 is located on the posterior condyle osteotomy surface 131, and the posterior chamfered spacer 22 is located on the posterior chamfered osteotomy surface 132. It is understood that the relative positions of the posterior condyle spacer 21 and the posterior chamfered spacer 22 can be adjusted independently. Thus, the posterior condyle spacer 21 and the posterior chamfered spacer 22 located on the posterior condyle osteotomy surface 131 and the posterior chamfered osteotomy surface 132 can be adjusted individually, including adjusting the displacement of the posterior condyle spacer 21 and the posterior chamfered spacer 22 along the thickness direction of the posterior condyle 13 and the amount of pressure applied to the distal end of the human femur 7. This can accommodate different femoral osteotomy deviations in different situations, greatly improving the tolerance for femoral osteotomy.

[0052] Preferably, if Figure 2 and Figure 5 As shown, the posterior condyle 13 includes a left posterior condyle 133 and a right posterior condyle 134, which are spaced apart along the left-right direction of the posterior condyle 13. There are two posterior condyle pads 21 and two posterior chamfered pads 22, one of which is provided on the left posterior condyle 133, and another of which is provided on the right posterior condyle 134. It will be understood that the left posterior condyle 133 corresponds to one set of posterior condyle pads 21 and posterior chamfered pads 22, while the right posterior condyle 134 corresponds to another set of posterior condyle pads 21 and posterior chamfered pads 22. Therefore, when adjusting the position of the femoral condyle prosthesis, the posterior pads 2 of the left posterior condyle 133 and the right posterior condyle 134 can be adjusted separately and specifically, so that the left posterior condyle 133 and the right posterior condyle 134 can independently move their positions and fit the human femur 7, thereby achieving the overall fit of the femoral condyle prosthesis with the human femur 7 and improving the stability of the femoral condyle prosthesis after implantation.

[0053] like Figure 4 and Figure 5As shown, the posterior condyle portion 13 of the embodiment of the present invention has a mounting groove 135 on the side facing the human femur 7, and part of the posterior pad 2 is disposed in the mounting groove 135, while the other part of the posterior pad 2 is located outside the mounting groove 135. It is understandable that at least a portion of the posterior condyle pad 21 is embedded in the mounting groove 135 at the posterior condyle osteotomy surface 131, and at least a portion of the posterior chamfered pad 22 is embedded in the mounting groove 135 at the posterior chamfered osteotomy surface 132. As a result, the posterior condyle pad 21 and the posterior chamfered pad 22 are prevented from moving along the thickness direction orthogonal to the posterior condyle portion 13, which is beneficial to improving the positioning accuracy of the posterior pad 2 and making the posterior pad 2 more stable after implantation.

[0054] like Figure 5 and Figure 6 As shown, the femoral condyle prosthesis of this embodiment of the present invention includes an adjustment member 3, which is disposed on the posterior condyle 13, with at least a portion of the adjustment member 3 disposed between the posterior pad 2 and the bottom of the mounting slot 135. The adjustment member 3 is used to adjust the position of the posterior pad 2 along the thickness direction of the posterior condyle 13. It will be appreciated that the adjustment member 3 disposed on the posterior condyle 13 can expand the gap between the posterior pad 2 and the bottom of the mounting slot 135, allowing the posterior condyle pad 21 and the posterior chamfered pad 22 to independently move along the thickness direction of the posterior condyle 13. Thus, the surgeon can adjust the relative position of the posterior pad 2 along the thickness direction of the posterior condyle 13 to ensure that the femoral condyle prosthesis fits the human femur 7.

[0055] Specifically, if Figure 5 and Figure 6 As shown, the adjusting member 3 includes a conical section 31 and a threaded section 32. In the direction from the threaded section 32 to the conical section 31, the cross-sectional profile of the conical section 31 gradually decreases. The threaded section 32 is threadedly fitted in the outer edge of the mounting groove 135. The conical section 31 is located between the posterior pad 2 and the bottom of the mounting groove 135. Rotating the adjusting member 3 can move the posterior pad 2 along the thickness direction of the posterior condyle 13.

[0056] For example, Figure 13 As shown, the cone angle α of the cone section 31 is between 3° and 15°. For example, the cone angle α of the cone section 31 can be 3°, 5°, 7°, 9°, 11°, 13°, or 15°. This can improve the stability of the cone section 31 in supporting the rear pad 2 and increase the adjustment efficiency.

[0057] Preferably, the adjusting member 3 is disposed in the posterior condyle 13 along the left-right direction of the posterior condyle 13 .

[0058] It is understood that the threaded section 32 of the adjusting member 3 is threadedly connected to the posterior condyle 13 of the femoral condyle prosthesis. Since the conical section 31 is located between the posterior spacer 2 and the bottom of the mounting groove 135, and the cross-sectional profile of the conical section 31 gradually decreases in the direction from the threaded section 32 to the conical section 31, when the adjusting member 3 is screwed into the posterior condyle 13, the conical section 31 moves accordingly, gradually screwing into the space between the posterior spacer 2 and the bottom of the mounting groove 135, gradually expanding the posterior spacer 2 and moving it toward the human femur 7 to press against the human femur 7. Conversely, when the adjusting member 3 is screwed out of the posterior condyle 13, the conical section 31 moves accordingly, driving the posterior spacer 2 to move away from the human femur 7.

[0059] It can be understood that, during the process of screwing the adjusting member 3 into or out of the posterior condyle 13 , the adjusting member 3 is always located in the posterior condyle 13 and does not protrude from the posterior condyle 13 .

[0060] Furthermore, the threaded section 32 has a first end 321 and a second end 322 opposite to each other along its axial direction, the conical section 31 is connected to the first end 321, and the second end 322 has a tool hole 3221, which is used to cooperate with an instrument, such as Figure 13 and Figure 14 The femoral condyle prosthesis of the embodiment of the present invention can make the adjustment of the posterior pad 2 simple by setting the adjustment member 3 as the above structure, and has a stable structure, is not easy to loosen, and has a good implantation effect.

[0061] Exemplarily, the tool hole 3221 may be a hexagonal hole or a plum blossom hole, so that the doctor can screw the adjusting member 3 with a wrench.

[0062] Specifically, if Figure 5 and Figure 6 As shown, a threaded hole 137 is provided in the posterior condyle 13, and the threaded hole 137 is located at the outer edge of the mounting groove 135. The threaded section 32 of the adjusting member 3 is threadedly engaged with the threaded hole 137. Thus, the threaded engagement between the threaded section 32 and the threaded hole 137 prevents the adjusting member 3 from becoming loose from the posterior condyle 13 along its axial direction. On the other hand, the insertion depth of the adjusting member 3 can be adjusted by rotating it, thereby adjusting the displacement of the posterior pad 2.

[0063] Furthermore, if Figure 6 As shown, a clearance hole 138 is provided on one end of the posterior spacer 2 near the threaded hole 137. The clearance hole 138 is used to clear the external threads of the threaded section 32. After the posterior condyle 13 is provided with the mounting groove 135, the outer edge thickness of the mounting groove 135 is limited. The provision of the clearance hole 138 ensures that the adjusting member 3 can be screwed into the posterior spacer 2 to a certain depth, ensuring that the posterior spacer 2 has sufficient travel.

[0064] like Figures 10 to 12As shown, at least one of the rear pad 2 and the bottom of the mounting groove 135 is provided with an arcuate groove 24, the wall of which mates with the conical section 31 of the adjusting member 3. For example, the arcuate groove 24 is provided on both the rear pad 2 and the bottom of the mounting groove 135. This increases the contact area between the adjusting member 3, the rear pad 2, and the bottom of the mounting groove 135, improving the stability of the adjusting member 3 after it is extended.

[0065] When the adjusting member 3 is screwed in until the size of the posterior condyle 13 increases, the gap between the posterior pad 2 and the bottom of the mounting groove 135 can be increased, thereby increasing the thickness of the posterior condyle 13. When the adjusting member 3 is screwed in until the size of the posterior condyle 13 decreases, the gap between the posterior pad 2 and the bottom of the mounting groove 135 can be decreased, thereby decreasing the thickness of the posterior condyle 13.

[0066] like Figure 5 and Figure 6 As shown, the femoral condyle prosthesis of the embodiment of the present invention includes a positioning member 4, which is disposed within the posterior condyle 13, and at least a portion of the positioning member 4 cooperates with the posterior pad 2 to prevent the posterior pad 2 from disengaging from the mounting groove 135. It will be understood that because the positioning member 4 is disposed within the posterior condyle 13 and cooperates with the posterior pad 2, the posterior pad 2 is prevented from disengaging from the mounting groove 135 during movement along the thickness direction of the posterior condyle 13, thereby serving as a positioning guide.

[0067] Specifically, if Figure 5 As shown, the positioning member 4 is fixedly connected to the outer edge of the mounting groove 135. The positioning member 4 is a cylinder. The posterior pad 2 is provided with a mating hole 23 that cooperates with the positioning member 4. The cross-sectional profile of the mating hole 23 is a strip, and the long side of the strip-shaped mating hole 23 extends along the thickness direction of the posterior pad 2, so that the posterior pad 2 can move relative to the positioning member 4 along the thickness direction of the posterior condyle 13. It can be understood that under the position constraints of the mating hole 23 and the positioning member 4, the posterior pad 2 can move along the thickness direction of the posterior condyle 13, and the posterior pad 2 will not fall out of the mounting groove 135 along the thickness direction of the posterior condyle 13. Therefore, the adjustment method of the posterior pad 2 can be simplified and the processing and manufacturing are convenient.

[0068] Specifically, see Figure 8 、 Figure 9 and Figure 11 The long side of the strip-shaped mating hole 23 that engages with the positioning member 4 extends along the thickness direction of the posterior pad 2, allowing the posterior pad 2 to move relative to the positioning member 4 along the thickness direction of the posterior condyle 13, thereby guiding the movement of the posterior pad 2. The short side of the strip-shaped mating hole 23 is consistent with the diameter of the positioning member 4, limiting the movement of the posterior pad 2 in a direction perpendicular to the thickness of the posterior condyle 13, ensuring the stability and accuracy of the adjustment of the posterior pad 2.

[0069] Illustratively, the positioning member 4 is a pin structure, and a positioning hole 136 is provided in the posterior condyle 13, extending in the left-right direction. The positioning holes 136 are located on the left and right outer edges of the mounting slot 135, and the positioning holes 136 are in communication with the mounting slot 135. The positioning member 4 is fixedly connected to the outer edge of the mounting slot 135 (i.e., the posterior condyle 13) through an interference fit with the positioning holes 136. Thus, the positioning holes 136 can limit the radial movement of the positioning member 4 along the positioning hole 136, thereby ensuring the positioning accuracy of the positioning member 4 and the stability of the posterior pad 2 during adjustment.

[0070] Optionally, the outer diameter of the positioning member 4 is between 1 mm and 4 mm.

[0071] like Figure 4 and Figure 5 As shown, there are at least two positioning members 4, and the two positioning members 4 are respectively arranged on the left and right sides of the adjusting member 3, thereby improving the positioning effect of the positioning members 4 on the rear pad 2 and improving the stability of the adjusting member 3 in adjusting the rear pad 2.

[0072] Taking the posterior condylar spacer 21 as an example, at least a portion of the adjusting member 3 is positioned between the posterior condylar spacer 21 and the bottom of the mounting slot 135. Two positioning members 4 are arranged vertically between the adjusting member 3 and the posterior condylar spacer 21. Thus, when the adjusting member 3 extends the posterior condylar spacer 21, the vertical position of the posterior condylar spacer 21 can be moved synchronously, thereby improving the accuracy of the vertical position adjustment of the posterior condylar spacer 21. Similarly, the posterior chamfered spacer 22 is also provided with two positioning members 4 and an adjusting member 3 positioned between the two positioning members 4 for use in conjunction therewith, which will not be further described here.

[0073] like Figure 4 and Figure 5 As shown, the posterior condyle pad 21 and the posterior chamfer pad 22 of the embodiment of the present invention are both adjusted and positioned using the above-mentioned “adjusting member 3 and positioning member 4”.

[0074] Taking the posterior condyle pad 21 as an example, the positioning member 4 is arranged in the mounting groove 135 along the left and right directions of the femoral condyle prosthesis, and cooperates with the posterior condyle pad 21 to limit the posterior condyle pad 21 from falling out of the mounting groove 135. At least part of the adjusting member 3 is arranged between the posterior condyle pad 21 and the bottom of the mounting groove 135. The adjusting member 3 can adjust the gap between the posterior condyle pad 21 and the bottom of the groove, which will not be repeated.

[0075] Taking the posterior chamfered pad 22 as an example, the positioning member 4 is arranged in the mounting groove 135 along the left and right directions of the femoral condyle prosthesis, and cooperates with the posterior chamfered pad 22 to limit the posterior chamfered pad 22 from escaping from the mounting groove 135. At least part of the adjusting member 3 is arranged between the posterior chamfered pad 22 and the bottom of the mounting groove 135. The adjusting member 3 can adjust the gap between the posterior chamfered pad 22 and the bottom of the groove, which will not be repeated.

[0076] Alternatively, as Figures 2 to 4 As shown, the distal portion 12 of the embodiment of the present invention has a distal osteotomy surface 121, and a support portion 5 is provided on the distal osteotomy surface 121. The support portion 5 is plate-shaped, and the long side of the plate-shaped support portion 5 extends along the anterior-posterior direction of the femoral condyle prosthesis, thereby helping to improve the stability of the femoral condyle prosthesis after implantation. Moreover, the long side of the plate-shaped support portion 5 extends along the anterior-posterior direction of the femoral condyle prosthesis, which can meet the slight anterior-posterior movement of the non-bone cement femoral condyle prosthesis brought about by adjusting the rear pad 2, so that the femoral condyle prosthesis can be slightly adjusted anterior and posteriorly.

[0077] When using the femoral condyle prosthesis according to an embodiment of the present invention, if the posterior condyle of the femur 7 has been excessively resected, a gap may form between the posterior condyle resection surface 131 of the femoral condyle prosthesis and the femur 7. The surgeon can adjust the posterior spacer 2 toward the femur 7 to fill the gap. If the anterior condyle of the femur 7 has been excessively resected, a gap may form between the anterior condyle resection surface 111 of the femoral condyle prosthesis and the femur 7. The surgeon can also adjust the posterior spacer 2 toward the femur 7, causing the entire femoral condyle prosthesis to slightly move toward the posterior condyle 13, thereby eliminating the gap between the anterior condyle resection surface 111 and the femur 7. During this process, the plate-shaped support portion 5 allows for micro-movement of the femoral condyle prosthesis, compared to conventional cylindrical columns.

[0078] Optionally, the dimension of the support portion 5 along the anterior-posterior direction of the femoral condyle prosthesis gradually decreases in the direction away from the distal osteotomy surface 121, thereby facilitating the insertion of the support portion 5 into the human femur 7. Figure 2 and Figure 7 As shown, the support portion 5 is generally in the shape of a triangular plate, with a structure that is smaller at the top and larger at the bottom.

[0079] like Figure 3 As shown, the support portion 5 has a first side 51 close to the distal osteotomy surface 121 and a second side 52 away from the distal osteotomy surface 121, the dimension of the first side 51 along the anterior-posterior direction of the femoral condyle prosthesis is L3, and the dimension of the second side 52 along the anterior-posterior direction of the femoral condyle prosthesis is L4, wherein 10mm≤L3≤40mm, 0mm≤L4≤20mm.

[0080] For example, L3 may be 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, or 40 mm, and L4 may be 0 mm, 5 mm, 10 mm, 15 mm, or 20 mm.

[0081] Optionally, the contour line of the support portion 5 extending from the first side 51 to the second side 52 away from the distal osteotomy surface 121 can be a curve, thereby facilitating the insertion of the support portion 5 into the human femur 7 during implantation.

[0082] Alternatively, as Figure 2 and Figure 3As shown, there are two support parts 5, and the two support parts 5 are arranged at intervals along the left and right directions of the distal end part 12, and the two support parts 5 are parallel to each other. Therefore, the structural stability of the support part 5 itself can be guaranteed, and the fusion effect of the support part 5 and the human femur 7 can be improved, thereby reducing the probability of loosening of the femoral condyle prosthesis.

[0083] Optionally, the support portion 5 has a dimension L1 (not shown) in the left-right direction of the femoral condyle prosthesis, wherein 1.5 mm ≤ L1 ≤ 6 mm. For example, L1 may be 1.5 mm, 2 mm, 3 mm, 4 mm, 5 mm, or 6 mm.

[0084] like Figure 3 As shown, the dimension of the support portion 5 along the thickness direction of the distal end portion 12 (i.e., the height of the support portion 5) is L2, wherein 6mm≤L2≤30mm. For example, L2 can be 6mm, 10mm, 15mm, 20mm, 25mm, or 30mm.

[0085] A dimension of the second side 52 along the anterior-posterior direction of the femoral condyle prosthesis is L4, wherein 10 mm≤L3≤40 mm, and 0 mm≤L4≤20 mm.

[0086] Alternatively, as Figure 7 As shown, a porous structure 6 is provided on the inner wall of at least one of the anterior condyle 11, distal portion 12, posterior condyle 13, and posterior pad 2, as well as the outer wall of the support portion 5. This improves the fusion of the femoral condyle prosthesis with the human femur 7 and reduces the likelihood of loosening of the femoral condyle prosthesis. Exemplarily, the porous structure 6 includes structures such as plasma coating, sintering, and 3D printing.

[0087] In other examples, the outer wall surface of the support portion 5 may also be sandblasted to improve the stability of the support portion 5 after being inserted into the femur 7 of the human body.

[0088] Optionally, the femoral condyle prosthesis further includes an anterior pad (not shown), which is disposed on the side of the anterior condyle 11 facing the human femur 7, and is positionally adjustable relative to the anterior condyle 11 along the thickness direction of the anterior condyle 11. Because the anterior pad is disposed on the side of the anterior condyle 11 facing the human femur 7 and is positionally adjustable relative to the anterior condyle 11 along the thickness direction of the anterior condyle 11, when the anterior pad is adjusted away from the anterior condyle 11, the anterior pad can drive the femoral condyle prosthesis forward, thereby clamping the distal end of the human femur 7 via the anterior condyle 11 and the anterior pad, thereby achieving initial stabilization of the femoral condyle prosthesis.

[0089] Alternatively, as Figures 1 to 4As shown, the anterior condyle portion 11 includes an anterior condyle osteotomy surface 111 and an anterior chamfered osteotomy surface 112, and the distal portion 12 has a distal osteotomy surface 121. The anterior condyle osteotomy surface 111, the anterior chamfered osteotomy surface 112 and the distal osteotomy surface 121 are connected in sequence, and the anterior side pad includes an anterior condyle pad and an anterior chamfered pad. The anterior condyle pad and the anterior chamfered pad are independent of each other. The anterior condyle pad is arranged on the anterior condyle osteotomy surface 111, and the anterior chamfered pad is arranged on the anterior chamfered osteotomy surface 112.

[0090] It can be understood that the relative positions of the anterior condyle pad and the anterior chamfer pad can be adjusted independently, thereby allowing the amount of pressure applied to the positions of the anterior condyle osteotomy surface 111 and the anterior chamfer osteotomy surface 112 to be adjusted in a targeted manner to meet the osteotomy deviation of the femur 7 in different situations, thereby greatly improving the tolerance for osteotomy of the femur 7.

[0091] A knee joint prosthesis according to another embodiment of the present invention comprises a femoral condyle prosthesis, a tibial liner and a tibial tray. The femoral condyle prosthesis is the femoral condyle prosthesis of the present invention, and the tibial liner is arranged between the tibial tray and the femoral condyle prosthesis.

[0092] According to the knee joint prosthesis of an embodiment of the present invention, since the posterior pad 2 is arranged on the side of the posterior condyle 13 facing the human femur, the position of the posterior pad 2 relative to the posterior condyle 13 along the thickness direction of the posterior condyle 13 is adjustable. When the femoral condyle prosthesis is implanted into the distal end of the human femur 7, the doctor can adaptively adjust the relative position of the posterior pad 2 and the posterior condyle 13 according to the fit between the osteotomy surface of the distal end of the human femur 7 and the femoral condyle prosthesis, so that the posterior pad 2 and the distal end of the human femur 7 are abutted and pressurized and fixed, thereby achieving the initial stability of the non-bone cement femoral condyle prosthesis, facilitating the later bone ingrowth, improving the long-term stability of the femoral condyle prosthesis after implantation, and fewer adverse reactions in patients.

[0093] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0094] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0095] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0096] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0097] In the present invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification, as well as features of different embodiments or examples, unless they are mutually inconsistent.

[0098] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present invention.

Claims

1. A femoral condyle prosthesis, characterized in that: include: A main body (1), the main body (1) comprising an anterior condyle (11), a distal end (12) and a posterior condyle (13), wherein the anterior condyle (11), the distal end (12) and the posterior condyle (13) are connected in sequence; A posterior pad (2) is provided on the side of the posterior condyle (13) facing the human femur (7), and the position of the posterior pad (2) relative to the posterior condyle (13) along the thickness direction of the posterior condyle (13) is adjustable.

2. The femoral condyle prosthesis according to claim 1, characterized in that: The posterior condyle portion (13) includes a posterior condyle osteotomy surface (131) and a posterior chamfered osteotomy surface (132), and the distal portion (12) has a distal osteotomy surface (121). The posterior condyle osteotomy surface (131), the posterior chamfered osteotomy surface (132) and the distal osteotomy surface (121) are connected in sequence, and the posterior pad (2) is provided on at least one of the posterior condyle osteotomy surface (131) and the posterior chamfered osteotomy surface (132).

3. The femoral condyle prosthesis according to claim 2, characterized in that: The posterior pad (2) comprises a posterior condyle pad (21) and a posterior chamfered pad (22), the posterior condyle pad (21) and the posterior chamfered pad (22) being independent of each other, the posterior condyle pad (21) being arranged on the posterior condyle osteotomy surface (131), and the posterior chamfered pad (22) being arranged on the posterior chamfered osteotomy surface (132).

4. The femoral condyle prosthesis according to claim 3, characterized in that: The posterior condyle (13) includes a left posterior condyle (133) and a right posterior condyle (134), and the left posterior condyle (133) and the right posterior condyle (134) are arranged at intervals along the left and right directions of the posterior condyle (13). There are two posterior condyle pads (21) and two posterior chamfered pads (22), one posterior condyle pad (21) and one posterior chamfered pad (22) are arranged on the left posterior condyle (133), and the other posterior condyle pad (21) and the other posterior chamfered pad (22) are arranged on the right posterior condyle (134).

5. The femoral condyle prosthesis according to claim 1, characterized in that The side of the posterior condyle (13) facing the human femur (7) has a mounting groove (135), part of the posterior pad (2) is arranged in the mounting groove (135), and the other part of the posterior pad (2) is located outside the mounting groove (135).

6. The femoral condyle prosthesis according to claim 5, characterized in that: The femoral condyle prosthesis comprises an adjusting member (3), the adjusting member (3) being arranged in the posterior condyle portion (13), and at least a portion of the adjusting member (3) being arranged between the posterior pad (2) and the bottom of the mounting slot (135), the adjusting member (3) being used to adjust the position of the posterior pad (2) along the thickness direction of the posterior condyle portion (13); And / or, the femoral condyle prosthesis includes a positioning member (4), the positioning member (4) is arranged in the posterior condyle portion (13), and at least part of the positioning member (4) cooperates with the posterior pad (2) to limit the posterior pad (2) from being separated from the mounting groove (135).

7. The femoral condyle prosthesis according to claim 6, characterized in that: The adjusting member (3) comprises a conical section (31) and a threaded section (32); the cross-sectional profile of the conical section (31) gradually decreases in the direction from the threaded section (32) to the conical section (31); the threaded section (32) is threadedly engaged in the outer edge of the mounting groove (135); the conical section (31) is located between the posterior pad (2) and the bottom of the mounting groove (135); and rotating the adjusting member (3) enables the posterior pad (2) to move along the thickness direction of the posterior condyle (13); And / or, the positioning member (4) is fixedly connected to the outer edge of the mounting groove (135), the positioning member (4) is a cylinder, and the rear pad (2) is provided with a matching hole (23) that matches the positioning member (4), the cross-sectional profile of the matching hole (23) is strip-shaped, and the long side of the strip-shaped matching hole (23) extends along the thickness direction of the rear pad (2), so that the rear pad (2) can move relative to the positioning member (4) along the thickness direction of the posterior condyle (13).

8. The femoral condyle prosthesis according to claim 7, characterized in that: The threaded section (32) has a first end (321) and a second end (322) opposite to each other along its axial direction, the conical section (31) is connected to the first end (321), and the second end (322) has a tool hole (3221); And / or, there are at least two positioning members (4).

9. The femoral condyle prosthesis according to any one of claims 1 to 8, characterized in that: The distal end portion (12) has a distal osteotomy surface (121), and a support portion (5) is provided on the distal osteotomy surface (121). The support portion (5) is plate-shaped, and the long side of the plate-shaped support portion (5) extends along the front-back direction of the femoral condyle prosthesis.

10. The femoral condyle prosthesis according to claim 9, characterized in that: There are two support parts (5), and the two support parts (5) are arranged at intervals along the left-right direction of the distal end portion; and / or, the dimension of the support portion (5) along the left-right direction of the distal end portion is L1, wherein 1.5 mm ≤ L1 ≤ 6 mm; and / or, the dimension of the support portion (5) in the thickness direction of the distal portion (12) is L2, wherein 6 mm ≤ L2 ≤ 30 mm; And / or, the dimension of the support portion (5) along the anterior-posterior direction of the femoral condyle prosthesis gradually decreases in a direction away from the distal osteotomy surface (121); And / or, the support portion (5) has a first side (51) close to the distal osteotomy surface (121) and a second side (52) away from the distal osteotomy surface (121), the first side (51) has a size L3 along the anterior-posterior direction of the femoral condyle prosthesis, and the second side (52) has a size L4 along the anterior-posterior direction of the femoral condyle prosthesis, wherein 10 mm ≤ L3 ≤ 40 mm, and 0 mm ≤ L4 ≤ 20 mm; And / or, a porous structure is provided on the side of at least one of the anterior condyle (11), the distal end (12), the posterior condyle (13), and the posterior pad (2) facing the human femur (7) and the outer wall surface of the support portion (5).

11. A knee joint prosthesis, characterized in that: include: A femoral condyle prosthesis, wherein the femoral condyle prosthesis is the femoral condyle prosthesis according to any one of claims 1 to 10; A tibial pad and a tibial tray are provided, wherein the tibial pad is arranged between the tibial tray and the femoral condyle prosthesis.

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