Femoral condyle prosthesis and knee prosthesis

Abstract

The present application relates to a kind of femoral condyle prosthesis and knee joint prosthesis, the femoral condyle prosthesis includes main body and rear pad, the main body includes front condyle, distal end and rear condyle, the front condyle, the distal end and the rear condyle are connected in turn, the rear pad is located in the side of the rear condyle towards human femur, the position of the rear pad is adjustable relative to the rear condyle along the thickness direction of the rear condyle.During operation, doctor can adjust the position of the rear pad in the femoral condyle prosthesis of the present application according to the osteotomy condition of the distal end of human femur, so that the femoral condyle prosthesis is in contact with the distal end of human femur and is pressurized fixed, realize the initial stability of non-cement femoral condyle prosthesis, and it is beneficial to the bone growth in later period.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a femoral condyle prosthesis and a knee joint prosthesis. Background Technology

[0002] With the increasing aging of the population, the usage rate of knee replacement surgery has risen significantly. Currently, knee prostheses used in knee replacement surgery can be divided into two types: cemented and uncemented. Cemented knee prostheses undergo processes such as spraying on the inner surface where they integrate with the femur to form a porous structure, enabling them to integrate tightly with the bone and achieve long-lasting bone ingrowth fixation. Their clinical application is growing rapidly.

[0003] In clinical practice, surgeons are prone to osteotomy deviations when performing femoral osteotomies, resulting in gaps between the femoral condyle prosthesis and the osteotomy surface at the distal end of the femur. For cemented femoral condyle prostheses, these gaps can be filled by injecting bone cement. However, for uncemented knee prostheses, which require a close fit to the distal femoral osteotomy surface during implantation, gaps prevent the application of pressure, hindering initial stability and long-term bone ingrowth. Summary of the Invention

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

[0005] Therefore, embodiments of the present invention propose a femoral condyle prosthesis that can adaptively adjust the position of the posterior pad according to the osteotomy of the distal femur, so that the femoral condyle prosthesis can abut against and be fixed under pressure with the distal femur, which is conducive to achieving the initial stability of the cementless femoral condyle prosthesis and is beneficial to the later bone ingrowth.

[0006] The femoral condyle prosthesis of an embodiment of the present invention includes: a main body, the main body including an anterior condyle, a distal end, and a posterior condyle, the anterior condyle, the distal end, and the posterior condyle being connected in sequence; and a posterior pad, the posterior pad being disposed 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 being adjustable.

[0007] According to an embodiment of the present invention, the femoral condyle prosthesis has a posterior pad located on the side of the posterior condyle facing the femur. The position of the posterior pad relative to the posterior condyle is adjustable along the thickness direction of the posterior condyle. When the femoral condyle prosthesis is implanted into the distal femur, the surgeon can adaptively adjust the relative position of the posterior pad and the posterior condyle based on the fit between the osteotomy surface of the distal femur and the femoral condyle prosthesis. This allows the posterior pad to abut against and pressurize the distal femur, achieving initial stability of the cementless femoral condyle prosthesis, which is beneficial for subsequent bone ingrowth, improves the long-term stability of the femoral condyle prosthesis after implantation, and reduces adverse reactions in patients.

[0008] Optionally, the posterior condyle includes a posterior condyle osteotomy surface and a posterior chamfered osteotomy surface, the distal end 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 disposed 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 chamfer pad, the posterior condyle pad and the posterior chamfer pad are independent of each other, the posterior condyle pad is disposed on the posterior condyle osteotomy surface, and the posterior chamfer pad is disposed on the posterior chamfer osteotomy surface.

[0010] Optionally, the posterior condyle includes a left posterior condyle and a right posterior condyle, the left posterior condyle and the right posterior condyle are arranged at intervals along the left and right directions of the posterior condyle, and there are two posterior condyle pads and two posterior chamfer pads, one posterior condyle pad and one posterior chamfer pad are provided on the left posterior condyle, and the other posterior condyle pad and the other posterior chamfer pad are provided on the right posterior condyle.

[0011] Optionally, the posterior condyle has a mounting groove on the side facing the human femur, with a portion of the posterior pads disposed within the mounting groove and another portion of the posterior pads located outside the mounting groove.

[0012] Optionally, the femoral condyle prosthesis includes an adjustment member disposed within the posterior condyle, and at least a portion of the adjustment member is disposed between the posterior pad and the bottom of the mounting groove. The adjustment 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 element disposed within the posterior condyle, and at least a portion of the positioning element engages with the posterior pad to prevent the posterior pad from disengaging from the mounting groove.

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

[0015] Optionally, the positioning member is fixedly connected to the outer edge of the mounting groove. The positioning member is a cylinder. The rear pad has a mating hole that mates with the positioning member. The cross-sectional profile of the mating hole is strip-shaped, 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 member along the thickness direction of the rear 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 elements.

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

[0019] Optionally, there are two support portions, which are arranged at intervals along the left and right directions of the distal end.

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

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

[0022] Optionally, the dimensions of the support portion along the anteroposterior direction of the femoral condyle prosthesis gradually decrease in the 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 dimension L3 along the anterior-posterior direction of the femoral condyle prosthesis, and the second side has a dimension L4 along the anterior-posterior direction of the femoral condyle prosthesis, wherein 10mm≤L3≤40mm and 0mm≤L4≤20mm.

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

[0025] Another embodiment of the knee joint prosthesis 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 support, wherein the tibial pad is disposed between the tibial support and the femoral condyle prosthesis. Attached Figure Description

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

[0027] Figure 2 This is a three-dimensional representation of the femoral condyle prosthesis according to an embodiment of the present invention. Figure 1 .

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

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

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

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

[0032] Figure 7 This is a three-dimensional representation of the femoral condyle prosthesis according to an embodiment of the present invention. Figure 2 .

[0033] Figure 8 This is a perspective view of the posterior condyle pad of the femoral condyle prosthesis according to an embodiment of the present invention.

[0034] Figure 9 This is a side view of the posterior condyle pad of the femoral condyle prosthesis according to an embodiment of the present invention.

[0035] Figure 10 This is a schematic diagram of the posterior condyle pad of the femoral condyle prosthesis according to another perspective of an embodiment of the present invention.

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

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

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

[0039] Figure 14 This is a perspective view of the adjustment component of the femoral condyle prosthesis according to an embodiment of the present invention.

[0040] Figure label:

[0041] 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 groove; 136. Positioning hole; 137. Threaded hole; 138. Clearance hole;

[0042] 2. Rear side pad; 21. Rear condyle pad; 22. Rear chamfered pad; 23. Mating hole; 24. Arc groove;

[0043] 3. Adjusting component; 31. Conical section; 32. Threaded section; 321. First end; 322. Second end; 3221. Tool hole;

[0044] 4. Positioning components;

[0045] 5. Supporting part; 51. First side; 52. Second side;

[0046] 6. Porous structure;

[0047] 7. Femur. Detailed Implementation

[0048] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0049] The following is a reference appendix. Figures 1 to 14 This invention describes femoral condyle prostheses and knee joint prostheses according to embodiments of the present invention.

[0050] The femoral condyle prosthesis of this invention includes a main body 1 and a posterior pad 2. The main body 1 includes an anterior condyle 11, a distal end 12, and a posterior condyle 13, which are connected sequentially. The posterior pad 2 is located on the side of the posterior condyle 13 facing the human femur 7, and its position relative to the posterior condyle 13 is adjustable along the thickness direction of the posterior condyle 13. It is understood that the position of the posterior pad 2 is adjustable along the direction facing or away from the osteotomy surface of the human femur 7.

[0051] According to an embodiment of the present invention, the femoral condyle prosthesis has a posterior pad 2 located on the side of the posterior condyle 13 facing the femur 7. The position of the posterior pad 2 relative to the posterior condyle 13 is adjustable along the thickness direction of the posterior condyle 13. When the position of the posterior pad 2 is adjusted in a 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 femur 7, so as to clamp the distal end of the femur 7 through the posterior condyle 13 and the posterior pad 2, thereby achieving the initial stability of the femoral condyle prosthesis. Therefore, when the femoral condyle prosthesis is implanted into the distal end of the 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 femur 7 and the femoral condyle prosthesis. This allows the posterior pad 2 to abut against and pressurize the distal end of the femur 7, achieving initial stability of the cementless femoral condyle prosthesis. This is beneficial for subsequent bone ingrowth, improves the long-term stability of the femoral condyle prosthesis after implantation, and reduces adverse reactions in patients.

[0052] Furthermore, because the inner surface of the uncemented femoral condyle prosthesis has a porous structure and is not filled with bone cement for fixation, it needs to be fitted with the femur 7 during surgery to achieve initial stability and subsequent bone ingrowth. Therefore, the rough, porous inner surface of the prosthesis can inevitably damage the femur 7 during implantation. However, in the embodiment of this invention, the anterior condyle 11 and posterior condyle 13 of the prosthesis can have a certain gap between them and the femur 7 during implantation. After implantation, the surgeon can adjust the position of the posterior pad 2 to achieve a proper fit between the prosthesis and the femur 7. Therefore, the femoral condyle prosthesis in this embodiment avoids damage to the femur during implantation.

[0053] Furthermore, if the doctor needs to revise the femoral condyle prosthesis later, the posterior pad 2 can be adjusted to move away from the distal end of the femur 7, so that the posterior pad 2 is separated from the femur 7 by a certain distance. This makes it easier for the femoral condyle prosthesis to detach from the femur 7, so that the doctor can remove the femoral condyle prosthesis.

[0054] like Figures 1 to 4 As shown, the posterior condyle portion 13 of this embodiment 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 disposed on at least one of the posterior condyle osteotomy surface 131 and the posterior chamfered osteotomy surface 132.

[0055] Preferably, the surgeon can choose to place one posterior pad 2 on the posterior condyle osteotomy surface 131 and another posterior pad 2 on the posterior chamfered osteotomy surface 132, depending on the osteotomy of the distal end of the femur 7. This increases the contact area between the posterior pad 2 and the posterior condyle 13 and the femur 7, thereby improving the stability and reliability of the femoral condyle prosthesis position adjustment.

[0056] In other embodiments, the physician may also choose to place the posterior pad 2 only on the posterior condyle osteotomy surface 131, depending on the osteotomy of the distal end of the femur 7. For example, the posterior pad 2 may be placed on the posterior chamfered osteotomy surface 132.

[0057] For example, the left and right width of the rear pad 2 is 15mm-30mm, and the thickness of the rear pad 2 is 3mm-7mm.

[0058] like Figures 2 to 5 As shown, the posterior pad 2 in this embodiment of the invention includes a posterior condyle pad 21 and a posterior chamfered pad 22. The posterior condyle pad 21 and the posterior chamfered pad 22 are independent of each other. The posterior condyle pad 21 is located on the posterior condyle osteotomy surface 131, and the posterior chamfered pad 22 is located on the posterior chamfered osteotomy surface 132. It can be understood that the relative positions of the posterior condyle pad 21 and the posterior chamfered pad 22 can be adjusted independently. Therefore, the posterior condyle pad 21 and the posterior chamfered pad 22 located on the posterior condyle osteotomy surface 131 and the posterior chamfered osteotomy surface 132 can be adjusted specifically, including adjusting the displacement of the posterior condyle pad 21 and the posterior chamfered pad 22 along the thickness direction of the posterior condyle portion 13 and the amount of pressure applied to the distal end of the femur 7, so as to meet the femur 7 osteotomy deviation under different conditions, and greatly improve the tolerance of femur 7 osteotomy.

[0059] Preferably, such as 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 arranged at intervals along the left-right direction of the posterior condyle 13. There are two posterior condyle pads 21 and two posterior chamfer pads 22. One posterior condyle pad 21 and one posterior chamfer pad 22 are located in the left posterior condyle 133, and the other posterior condyle pad 21 and the other posterior chamfer pad 22 are located in the right posterior condyle 134. It can be understood that the left posterior condyle 133 corresponds to one set of posterior condyle pads 21 and posterior chamfer pads 22, and the right posterior condyle 134 corresponds to another set of posterior condyle pads 21 and posterior chamfer 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, so that the left posterior condyle 133 and the right posterior condyle 134 can move independently and fit into the human femur 7, thereby achieving overall fit between the femoral condyle prosthesis and the human femur 7 and improving the stability of the femoral condyle prosthesis after implantation.

[0060] like Figure 4 and Figure 5As shown, in this embodiment of the invention, the posterior condyle 13 has a mounting groove 135 on the side facing the femur 7. A portion of the posterior condyle pad 2 is disposed within the mounting groove 135, while another portion of the posterior condyle pad 2 is located outside the mounting groove 135. It can be understood 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. This prevents the posterior condyle pad 21 and the posterior chamfered pad 22 from shifting along the thickness direction orthogonal to the posterior condyle 13, which is beneficial to improving the positioning accuracy of the posterior pad 2 and making the posterior pad 2 more stable after implantation.

[0061] like Figure 5 and Figure 6 As shown, the femoral condyle prosthesis of this embodiment includes an adjusting member 3, which is disposed in the posterior condyle 13, and at least part of the adjusting member 3 is disposed between the posterior pad 2 and the bottom of the mounting groove 135. The adjusting member 3 is used to adjust the position of the posterior pad 2 along the thickness direction of the posterior condyle 13. It can be understood that the adjusting member 3 disposed in the posterior condyle 13 can widen the gap between the posterior pad 2 and the bottom of the mounting groove 135, so that the posterior condyle pad 21 and the posterior chamfered pad 22 can move independently along the thickness direction of the posterior condyle 13. Thus, the doctor can adjust the relative position of the posterior pad 2 along the thickness direction of the posterior condyle 13 to make the femoral condyle prosthesis fit the human femur 7.

[0062] Specifically, such as 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 into the outer edge of the mounting groove 135. The conical section 31 is located between the rear pad 2 and the bottom of the mounting groove 135. Rotating the adjusting member 3 can move the rear pad 2 along the thickness direction of the rear condyle 13.

[0063] For example, such as Figure 13 As shown, the cone angle α of the conical segment 31 is between 3° and 15°. For example, the cone angle α of the conical segment 31 can be 3°, 5°, 7°, 9°, 11°, 13°, or 15°. This can improve the stability of the conical segment 31 supporting the rear pad block 2, and the adjustment efficiency is relatively high.

[0064] Preferably, the adjusting member 3 is inserted into the rear condyle 13 in the left-right direction.

[0065] Understandably, 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 pad 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, the conical section 31 moves accordingly during the process of screwing the adjusting member 3 into the posterior condyle 13. It gradually screws into the space between the posterior pad 2 and the bottom of the mounting groove 135, gradually opening the posterior pad 2 and moving it closer to the femur 7 to press it against the femur 7. Conversely, during the process of screwing the adjusting member 3 out of the posterior condyle 13, the conical section 31 moves accordingly, causing the posterior pad 2 to move away from the femur 7.

[0066] It is understandable that during the process of screwing the adjusting member 3 into or out of the posterior condyle 13, the adjusting member 3 remains within the posterior condyle 13 and does not protrude from the posterior condyle 13.

[0067] Furthermore, the threaded segment 32 has a first end 321 and a second end 322 opposite to each other along its axial direction. The tapered segment 31 is connected to the first end 321, and the second end 322 has a tool hole 3221 for mating with an instrument, such as... Figure 13 and Figure 14 As shown. The femoral condyle prosthesis of the embodiment of the present invention, by setting the adjustment member 3 to the above-described structure, makes the adjustment of the posterior pad 2 simple, the structure stable, not easy to loosen, and the implantation effect good.

[0068] For example, the tool hole 3221 can be an internal hexagonal hole or a Torx hole so that the doctor can turn the adjusting part 3 with a wrench.

[0069] Specifically, such as Figure 5 and Figure 6 As shown, a threaded hole 137 is provided in the rear condyle 13, located on 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 of the threaded section 32 with the threaded hole 137 can, on the one hand, prevent the adjusting member 3 from loosening along its axial direction from the rear condyle 13, and on the other hand, the insertion depth of the adjusting member 3 can be adjusted by rotation, thereby adjusting the displacement of the rear pad 2.

[0070] Furthermore, such as Figure 6 As shown, the rear pad 2 has a clearance hole 138 on one end near the threaded hole 137. The clearance hole 138 is used to avoid the external thread of the threaded section 32. After the mounting groove 135 is provided in the rear condyle 13, the outer edge thickness of the mounting groove 135 is limited. Providing the clearance hole 138 can ensure that the adjusting member 3 can be screwed in to a certain depth, and ensure that the rear pad 2 has sufficient movement stroke.

[0071] 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 arc-shaped groove 24, and the wall surface of the arc-shaped groove 24 fits against the conical section 31 of the adjusting member 3. Exemplarily, arc-shaped grooves 24 are 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 and the bottom of the rear pad 2 and the mounting groove 135, improving the stability of the adjusting member 3 after it is opened.

[0072] When the adjusting member 3 is screwed in to increase the size of the rear condyle 13, the gap between the rear pad 2 and the bottom of the mounting groove 135 increases, resulting in a thicker rear condyle 13. When the adjusting member 3 is screwed in to decrease the size of the rear condyle 13, the gap between the rear pad 2 and the bottom of the mounting groove 135 decreases, resulting in a thinner rear condyle 13.

[0073] like Figure 5 and Figure 6 As shown, the femoral condyle prosthesis of this embodiment 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 can be understood that because the positioning member 4 is disposed within the posterior condyle 13 and cooperates with the posterior pad 2, it can prevent the posterior pad 2 from disengaging from the mounting groove 135 during movement along the thickness direction of the posterior condyle 13, thus serving a positioning and guiding function.

[0074] Specifically, such as Figure 5 As shown, the positioning element 4 is fixedly connected to the outer edge of the mounting groove 135. The positioning element 4 is a cylinder, and the rear pad 2 is provided with a mating hole 23 that mates with the positioning element 4. The cross-sectional profile of the mating hole 23 is strip-shaped, and the long side of the strip-shaped mating hole 23 extends along the thickness direction of the rear pad 2, so that the rear pad 2 can move relative to the positioning element 4 along the thickness direction of the rear condyle 13. It can be understood that under the positional constraints of the mating hole 23 and the positioning element 4, the rear pad 2 can move along the thickness direction of the rear condyle 13, and the rear pad 2 will not dislodge from the mounting groove 135 along the thickness direction of the rear condyle 13. Therefore, the adjustment method of the rear pad 2 is simple and the manufacturing process is convenient.

[0075] Specifically, see Figure 8 , Figure 9 and Figure 11 The long side of the strip-shaped mating hole 23 that mates with the positioning member 4 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 rear condyle 13, thereby guiding the movement of the rear pad 2. The short side dimension of the strip-shaped mating hole 23 is the same as the diameter of the positioning member 4, so as to restrict the movement of the rear pad 2 along a direction orthogonal to the thickness of the rear condyle 13, ensuring the stability and accuracy of the movement adjustment of the rear pad 2.

[0076] For example, the positioning member 4 is a pin structure, and the rear condyle 13 is provided with a positioning hole 136 that runs through in the left-right direction. The positioning hole 136 is located on the outer edges of the mounting groove 135 in the left-right direction, and the positioning hole 136 communicates with the mounting groove 135. The positioning member 4 can be fixedly connected to the outer edge of the mounting groove 135 (i.e., the rear condyle 13) by interference fit with the positioning hole 136. Thus, the positioning hole 136 can restrict the radial movement of the positioning member 4 along the positioning hole 136 to ensure the positioning accuracy of the positioning member 4 and the stability of the rear pad 2 during adjustment.

[0077] Optionally, the outer diameter of the positioning element 4 is between 1mm and 4mm.

[0078] like Figure 4 and Figure 5 As shown, there are at least two positioning elements 4, and the two positioning elements 4 are respectively arranged on the left and right sides of the adjusting element 3. This improves the positioning effect of the positioning elements 4 on the rear pad 2 and improves the stability of the adjusting element 3 in adjusting the rear pad 2.

[0079] Taking the posterior condyle pad 21 as an example, at least a portion of the adjusting member 3 is located between the posterior condyle pad 21 and the bottom of the mounting groove 135, and two positioning members 4 are arranged between the adjusting members 3 along the vertical direction of the posterior condyle pad 21. Therefore, when the adjusting member 3 opens the posterior condyle pad 21, the vertical position of the posterior condyle pad 21 can move synchronously, thereby improving the accuracy of adjusting the vertical position of the posterior condyle pad 21. Similarly, on the rear chamfer pad 22, two positioning members 4 and an adjusting member 3 located between the two positioning members 4 are also provided for cooperative use; details will not be elaborated here.

[0080] like Figure 4 and Figure 5 As shown, in this embodiment of the invention, the posterior condyle pad 21 and the posterior chamfer pad 22 are both adjusted and positioned using the above-described "adjusting member 3 and positioning member 4".

[0081] Taking the posterior condyle pad 21 as an example, the positioning member 4 is inserted into the mounting groove 135 along the left and right direction of the femoral condyle prosthesis and cooperates with the posterior condyle pad 21 to prevent the posterior condyle pad 21 from falling out of the mounting groove 135. At least part of the adjusting member 3 is located 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 described in detail.

[0082] Taking the rear chamfered pad 22 as an example, the positioning member 4 is inserted into the mounting groove 135 along the left and right direction of the femoral condyle prosthesis and cooperates with the rear chamfered pad 22 to prevent the rear chamfered pad 22 from falling out of the mounting groove 135. At least part of the adjusting member 3 is located between the rear chamfered pad 22 and the bottom of the mounting groove 135. The adjusting member 3 can adjust the gap between the rear chamfered pad 22 and the bottom of the groove, which will not be described in detail.

[0083] Optionally, such as Figures 2 to 4 As shown, the distal end 12 of this embodiment of the invention has a distal osteotomy surface 121, on which a support portion 5 is provided. 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. This is beneficial to improving the stability of the femoral condyle prosthesis after implantation. Moreover, the extension of the long side of the plate-shaped support portion 5 along the anterior-posterior direction of the femoral condyle prosthesis can meet the slight anterior-posterior movement of the uncemented femoral condyle prosthesis caused by adjusting the posterior pad 2, so that the femoral condyle prosthesis can be adjusted slightly anteriorly and posteriorly.

[0084] When using the femoral condyle prosthesis of the embodiments of the present invention, if excessive posterior condyle osteotomy is performed on the human femur 7, a gap will exist between the posterior condyle osteotomy surface 131 of the femoral condyle prosthesis and the human femur 7. The surgeon can adjust the posterior pad 2 to move towards the human femur 7 to fill this gap. If excessive anterior condyle osteotomy is performed on the human femur 7, a gap will exist between the anterior condyle osteotomy surface 111 of the femoral condyle prosthesis and the human femur 7. The surgeon can also adjust the posterior pad 2 to move towards the human femur 7. In this case, the femoral condyle prosthesis as a whole will slightly move towards the posterior condyle 13 to eliminate the gap between the anterior condyle osteotomy surface 111 and the human femur 7. In this process, compared to the existing cylindrical column, the plate-shaped support 5 allows for slight movement of the femoral condyle prosthesis.

[0085] Optionally, the dimensions of the support portion 5 along the anteroposterior direction of the femoral condyle prosthesis gradually decrease 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 part 5 is roughly triangular in shape, with a structure that is smaller at the top and larger at the bottom.

[0086] like Figure 3 As shown, the support portion 5 has a first side 51 near the distal osteotomy surface 121 and a second side 52 away from the distal osteotomy surface 121. The first side 51 has a dimension of L3 along the anterior-posterior direction of the femoral condyle prosthesis, and the second side 52 has a dimension of L4 along the anterior-posterior direction of the femoral condyle prosthesis, wherein 10mm≤L3≤40mm and 0mm≤L4≤20mm.

[0087] For example, L3 can be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, or 40mm. L4 can be 0mm, 5mm, 10mm, 15mm, or 20mm.

[0088] Optionally, the outline 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 curved, thereby facilitating the insertion of the support portion 5 into the human femur 7 during implantation.

[0089] Optionally, such as Figure 2 and Figure 3As shown, there are two support parts 5, which are arranged at intervals along the left and right directions of the distal end 12 and are parallel to each other. This can ensure the structural stability of the support parts 5 themselves, improve the fusion effect between the support parts 5 and the human femur 7, and reduce the probability of loosening of the femoral condyle prosthesis.

[0090] Optionally, the dimension of the support portion 5 along the left-right direction of the femoral condyle prosthesis is L1 (not shown in the figure), wherein 1.5mm≤L1≤6mm. For example, L1 can be 1.5mm, 2mm, 3mm, 4mm, 5mm, or 6mm.

[0091] 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, where 6mm≤L2≤30mm. For example, L2 can be 6mm, 10mm, 15mm, 20mm, 25mm, or 30mm.

[0092] The dimension of the second side 52 along the anterior-posterior direction of the femoral condyle prosthesis is L4, where 10mm≤L3≤40mm and 0mm≤L4≤20mm.

[0093] Optionally, such as Figure 7 As shown, a porous structure 6 is provided on the inner wall surface of at least one of the anterior condyle 11, the distal end 12, the posterior condyle 13, and the posterior pad 2, and on the outer wall surface of the support portion 5. This can improve the fusion effect between the femoral condyle prosthesis and the human femur 7, and reduce the probability of loosening of the femoral condyle prosthesis. Exemplarily, the porous structure 6 includes structures such as plasma coating, sintering, and 3D printing.

[0094] In other examples, the outer wall of the support 5 may also be sandblasted to improve the stability of the support 5 after it is inserted into the human femur 7.

[0095] Optionally, the femoral condyle prosthesis also includes an anterior pad (not shown), which is located on the side of the anterior condyle 11 facing the femur 7. The position of the anterior pad relative to the anterior condyle 11 is adjustable along the thickness direction of the anterior condyle 11. Since the anterior pad is located on the side of the anterior condyle 11 facing the femur 7, and the position of the anterior pad relative to the anterior condyle 11 is adjustable along the thickness direction of the anterior condyle 11, when the position of the anterior pad is adjusted away from the anterior condyle 11, the anterior pad can move the femoral condyle prosthesis forward, so as to clamp the distal end of the femur 7 through the anterior condyle 11 and the anterior pad, thereby achieving initial stability of the femoral condyle prosthesis.

[0096] Optionally, such as Figures 1 to 4As shown, the anterior condyle 11 includes an anterior condyle osteotomy surface 111 and an anterior chamfered osteotomy surface 112, and the distal part 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. The anterior 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 located on the anterior condyle osteotomy surface 111 and the anterior chamfered pad is located on the anterior chamfered osteotomy surface 112.

[0097] Understandably, the relative positions of the anterior condyle pad and the anterior chamfered pad can be adjusted independently, thereby allowing for targeted adjustment of the pressure applied to the positions of the anterior condyle osteotomy surface 111 and the anterior chamfered osteotomy surface 112 to meet the femoral 7 osteotomy deviation under different conditions, and greatly improving the tolerance for femoral 7 osteotomy.

[0098] Another embodiment of the knee joint prosthesis of the present invention includes: a femoral condyle prosthesis, a tibial pad, and a tibial support, wherein the femoral condyle prosthesis is the femoral condyle prosthesis of the present invention, and the tibial pad is disposed between the tibial support and the femoral condyle prosthesis.

[0099] According to an embodiment of the present invention, the knee prosthesis has a posterior pad 2 located on the side of the posterior condyle 13 facing the 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 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 femur 7 and the femoral condyle prosthesis, so that the posterior pad 2 abuts against and is fixed with pressure to the distal end of the femur 7, thereby achieving the initial stability of the cementless femoral condyle prosthesis, which is conducive to the later bone ingrowth, improves the long-term stability of the femoral condyle prosthesis after implantation, and reduces adverse reactions in patients.

[0100] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0101] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0102] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0103] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0104] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0105] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A femoral condyle prosthesis, characterized by, The femoral condyle prosthesis comprises a main body (1) and a rear side pad (2). The main body (1) comprises a front condyle part (11), a distal end part (12) and a rear condyle part (13) connected in sequence. The rear condyle part (13) comprises a rear condyle osteotomy surface (131) and a rear chamfer osteotomy surface (132), and the distal end part (12) has a distal end osteotomy surface (121), wherein the rear condyle osteotomy surface (131), the rear chamfer osteotomy surface (132) and the distal end osteotomy surface (121) are connected in sequence, and the rear side pad (2) is arranged on at least one of the rear condyle osteotomy surface (131) and the rear chamfer osteotomy surface (132).

2. The femoral condyle prosthesis of claim 1 wherein, The rear side pad (2) comprises a rear condyle pad (21) and a rear chamfer pad (22), wherein the rear condyle pad (21) and the rear chamfer pad (22) are independent of each other, the rear condyle pad (21) is arranged on the rear condyle osteotomy surface (131), and the rear chamfer pad (22) is arranged on the rear chamfer osteotomy surface (132).

3. The femoral condyle prosthesis of claim 2, wherein, The rear condyle part (13) comprises a left rear condyle (133) and a right rear condyle (134) arranged in a left-right direction of the rear condyle part (13), and the rear condyle pad (21) and the rear chamfer pad (22) are both two, one rear condyle pad (21) and one rear chamfer pad (22) are arranged on the left rear condyle (133), and the other rear condyle pad (21) and the other rear chamfer pad (22) are arranged on the right rear condyle (134).

4. The femoral condyle prosthesis of claim 3, wherein, The rear condyle part (13) has a mounting groove (135) on a side facing the human femur (7), and part of the rear side pad (2) is arranged in the mounting groove (135), and the other part of the rear side pad (2) is located outside the mounting groove (135).

5. The femoral condyle prosthesis of claim 1 wherein, The femoral condyle prosthesis comprises an adjusting member (3) arranged in the rear condyle part (13), and at least part of the adjusting member (3) is arranged between the rear side pad (2) and the bottom of the mounting groove (135), and the adjusting member (3) is used for adjusting the position of the rear side pad (2) in the thickness direction of the rear condyle part (13).

6. The femoral condyle prosthesis of claim 5, wherein, And / or, the femoral condyle prosthesis comprises a positioning member (4) arranged in the rear condyle part (13), and at least part of the positioning member (4) cooperates with the rear side pad (2) to limit the rear side pad (2) from being separated from the mounting groove (135). ​ 7. The femoral condyle prosthesis of claim 6, wherein, 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 connected in the outer edge of the mounting groove (135), the conical section (31) is located between the rear side pad (2) and the groove bottom of the mounting groove (135), and rotating the adjusting member (3) can move the rear side pad (2) along the thickness direction of the rear condyle (13); And / or, the positioning member (4) is fixedly connected with the outer edge of the mounting groove (135), the positioning member (4) is a cylinder, the rear side pad (2) is provided with a matching hole (23) matched with 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 side pad (2), so that the rear side pad (2) can move along the thickness direction of the rear condyle (13) relative to the positioning member (4).

8. The femoral condyle prosthesis of claim 7, wherein, The threaded section (32) has a first end (321) and a second end (322) opposite along the axial direction thereof, the conical section (31) is connected with the first end (321), and the second end (322) has a tool hole (3221); And / or, the positioning member (4) is at least two.

9. The femoral condyle prosthesis of any of claims 1-8, wherein, The distal end part (12) has a distal end bone cutting surface (121), and the distal end bone cutting surface (121) is provided with a support part (5), the support part (5) is plate-shaped, and the long side of the plate-shaped support part (5) extends along the front-rear direction of the femoral condyle prosthesis.

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

11. A knee prosthesis, characterized in that Comprise: The femoral condyle prosthesis is the femoral condyle prosthesis in any one of claims 1-10; A tibial spacer and a tibial tray, the tibial spacer being disposed between the tibial tray and the femoral condylar prosthesis.

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