Femoral prosthesis

Abstract

The present invention discloses a femoral prosthesis, comprising: a body, the body having a bone cement groove, the bottom wall of the bone cement groove being an osteotomy surface; a column, the column being mounted on the osteotomy surface; and a stopper, the stopper being arranged at the rear of the osteotomy surface, the stopper protruding from the osteotomy surface to the front side, wherein the stopper extends along the width direction of the bone cement groove; or, the stopper is multiple, and the multiple stoppers are arranged at intervals along the width direction and / or the length direction of the bone cement groove. Therefore, the femoral prosthesis according to the embodiment of the present invention has the advantage that it is still not easy to deviate from the installation position when the flexion degree of the knee joint is high.

Description

Technical Field

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

[0002] Unicompartmental knee replacement refers to the replacement of only the diseased compartment on the medial or lateral side of the knee joint. It is a special form of knee replacement surgery. Compared with total knee replacement, it has the advantages of less trauma, faster recovery, postoperative joint function closer to the physiological state, and easier revision.

[0003] The femoral prosthesis is installed on the femur. The range of motion of the normal knee joint is usually between 0°-120°, and can reach 150-155° at high flexion. After unicompartmental knee prosthesis replacement, the femoral prosthesis simulates the movement of the human knee joint in vivo. When the human body moves, after the flexion exceeds a certain angle (for example, at high flexion), the force between the tibia and the femur will tend to cause the femoral prosthesis to dislocate. If the femoral prosthesis has insufficient anti-dislocation performance, there is a risk of dislocation of the femoral prosthesis after surgery, which can lead to serious consequences such as revision surgery, affecting human health. 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. To this end, an embodiment of the present invention provides a femoral prosthesis.

[0005] A femoral prosthesis according to an embodiment of the present invention comprises:

[0006] A main body, wherein the main body has a bone cement groove, and the bottom wall surface of the bone cement groove is an osteotomy surface;

[0007] A column mounted on the osteotomy surface; and

[0008] A stopper is arranged at the rear of the osteotomy surface, and the stopper protrudes from the front side of the osteotomy surface, wherein

[0009] The stopper extends along the width direction of the bone cement groove;

[0010] Alternatively, there are a plurality of stoppers, and the plurality of stoppers are arranged at intervals along the width direction and / or length direction of the bone cement groove.

[0011] In some embodiments, the osteotomy surface includes a posterior bevel and a posterior condylar surface, the posterior bevel is located on the front side of the posterior condylar surface, the proximal edge of the posterior bevel is connected to the distal edge of the posterior condylar surface, and the stopper includes a first stopper and a second stopper;

[0012] The first stopper is installed on the rear inclined surface and protrudes forward from the rear inclined surface, and the second stopper is installed on the rear condyle surface and protrudes forward from the rear condyle surface;

[0013] Optionally, the osteotomy surface further includes a distal surface, the rear edge of the distal surface is connected to the front edge of the rear inclined surface, and the column is installed on the distal surface.

[0014] In some embodiments, the first stopper has a rear oblique anti-recoil surface extending from the rear oblique surface toward the front side and toward the proximal side, and the angle between the rear oblique anti-recoil surface and the horizontal plane is a first angle α;

[0015] The second stopper has a posterior condyle retreat prevention surface extending from the posterior condyle surface toward the front and toward the proximal side, and the angle between the posterior condyle retreat prevention surface and the horizontal plane is a second angle β.

[0016] In some embodiments, the first stopper and the second stopper are triangular prism-shaped, and the first stopper and the second stopper have a first side edge, a second side edge and a third side edge, the second side edge is located between the first side edge and the third side edge in the proximal and distal direction, and the first side edge is located on the distal side of the third side edge;

[0017] The surface of the first stopper located between the first side edge of the first stopper and the second side edge of the first stopper is the rear oblique anti-retraction surface, and the surface of the first stopper located between the first side edge of the first stopper and the third side edge of the first stopper is connected to the rear oblique surface;

[0018] The surface of the second stopper located between the first side edge of the second stopper and the second side edge of the second stopper is the posterior condyle anti-retreat surface, and the surface of the second stopper located between the first side edge of the second stopper and the third side edge of the second stopper is connected to the posterior condyle surface.

[0019] In some embodiments, the first stopper and the second stopper are in the shape of a quadrangular prism, and the first stopper and the second stopper have a fourth side edge, a fifth side edge, a sixth side edge and a seventh side edge in sequence, the fifth side edge is located at the front end of the fourth side edge, the sixth side edge and the seventh side edge in the front-to-back direction, and the fourth side edge is located at the far side of the fifth side edge and is adjacent to the fifth side edge;

[0020] The surface of the first stopper located between the fourth side edge of the first stopper and the fifth side edge of the first stopper is the rear oblique anti-retreat surface, and the surface of the first stopper located between the fourth side edge of the first stopper and the seventh side edge of the first stopper is connected to the rear oblique surface;

[0021] The surface of the second stopper located between the fourth lateral edge of the second stopper and the fifth lateral edge of the second stopper is the posterior condyle anti-retreat surface, and the surface of the second stopper located between the fourth lateral edge of the second stopper and the seventh lateral edge of the second stopper is connected to the posterior condyle surface.

[0022] In some embodiments, the first angle α is in the range of 90°-180°, and / or the second angle β is in the range of 102°-180°.

[0023] In some embodiments, the first angle α is in the range of 145°-155°, and / or the second angle β is in the range of 145°-155°.

[0024] In some embodiments, the posterior oblique anti-recession surface is parallel to the posterior condylar anti-recession surface; and / or, the first angle α is 150°, and the second angle β is 150°.

[0025] In some embodiments, the first stopper is provided in plurality, each of the first stoppers extends along the width direction of the bone cement groove, and the spacing between the first stoppers in the extending direction of the bone cement groove is 3 mm-5 mm; and / or,

[0026] There are multiple second stoppers, each of which extends along the width direction of the bone cement groove, and the spacing between the second stoppers in the extending direction of the bone cement groove is 3mm-5mm;

[0027] Optionally, the number of the first stoppers is 2, and the number of the second stoppers is 3.

[0028] In some embodiments, the depth of the bone cement groove is less than or equal to 2 mm; the thickness of the stopper is between 0.3 mm and 1 mm, and optionally, the thickness of the stopper is 0.35 mm.

[0029] The technical solution of the embodiment of the present invention has the following beneficial effects:

[0030] According to an embodiment of the present invention, a stopper is provided at the rear of the osteotomy surface of the femoral prosthesis, and the stopper can interact with the bone cement in the bone cement groove. The stopper protrudes from the osteotomy surface to the front side, increasing the contact surface between the body and the bone cement, so that the bone cement covering the stopper has a recessed portion with an opening toward the rear side and toward the proximal side, and the stopper can engage with the recessed portion of the bone cement. When the femoral prosthesis slides toward the distal side, that is, when the stopper slides toward the distal side along with the body, the recessed portion on the bone cement will play a certain blocking role in the distal sliding of the stopper. At the same time, the force of the rear part of the body pressing the front side will press the stopper located at the rear of the osteotomy surface against the recessed portion of the bone cement, increase the strength of the mutual engagement between the stopper and the recessed portion of the bone cement, and further block the stopper from sliding toward the distal side. Therefore, the stopper can play an effective blocking role in the sliding of the femoral prosthesis, so that the femoral prosthesis is still not easy to deviate from the installation position even when the flexion degree of the knee joint is high. Therefore, the femoral prosthesis of the embodiment of the present invention has the advantage that it is not easy to deviate from the installation position when the flexion degree of the knee joint is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 1 is a schematic structural diagram of a three-dimensional view of a femoral prosthesis according to an embodiment of the present invention.

[0032] Figure 2 1 is a schematic structural diagram of a side view of a femoral prosthesis according to an embodiment of the present invention.

[0033] Figure 3 is a structural schematic diagram of an enlarged view of a stopper according to an embodiment of the present invention.

[0034] Figure 4 is a structural schematic diagram of an enlarged view of a stopper according to an embodiment of the present invention.

[0035] Figure 5 It is a test bar graph of the displacement of the femoral prosthesis when there is no defect in the bone cement.

[0036] Figure 6 It is a test bar graph of the displacement of the femoral prosthesis when the bone cement defect is 1 / 3.

[0037] Figure 7 It is a test bar graph of the displacement of the femoral prosthesis when there is a complete bone cement defect.

[0038] Figure 8 It is a test diagram showing the relationship between the angle between the anti-retraction surface of the femoral prosthesis and the horizontal plane and the dislocation displacement. DETAILED DESCRIPTION

[0039] 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.

[0040] The femoral prosthesis 1000 according to an embodiment of the present invention will be described below with reference to the accompanying drawings. Figures 1 to 4 As shown, a femoral prosthesis 1000 according to an embodiment of the present invention includes a body 100, a column 300 and a stopper.

[0041] The body 100 has a bone cement groove 200, the bottom wall surface of the bone cement groove 200 is an osteotomy surface 400, and the column 300 is installed on the osteotomy surface 400. The bottom wall surface of the bone cement groove 200 refers to the wall surface of the bone cement groove 200 opposite to its opening.

[0042] The stopper is disposed at the rear of the osteotomy surface 400, and the stopper protrudes from the osteotomy surface 400 toward the front side. The stopper extends along the width direction of the bone cement groove 200. Alternatively, there are multiple stoppers, and the multiple stoppers are disposed at intervals along the width direction of the bone cement groove 200.

[0043] The femoral prosthesis 1000 is installed on the femur, and the osteotomy surface 400 is the surface facing the femoral condyle. By filling the bone cement in the bone cement groove 200 on the body 100, the osteotomy surface 400 is adhered to the femoral condyle, that is, the bone cement plays a role in fixing the body 100 to the femur. In other words, the anti-dislocation performance of the femoral prosthesis 1000 is related to whether the osteotomy surface 400 and the femoral condyle are completely adhered by bone cement. If osteoporosis or bone cement deficiency occurs, resulting in a gap between the osteotomy surface 400 and the femoral condyle, the anti-dislocation performance of the femoral prosthesis 1000 will be reduced.

[0044] When in knee flexion state, femoral prosthesis 1000 is subjected to the action force of tibial side, especially when the flexion degree of knee joint exceeds a certain angle (for example, can be 110 °), femoral prosthesis 1000 is subjected to the action force of tibial side stronger, and femoral prosthesis 1000 has the tendency of coming out from femur.When flexion degree is higher, the action force of tibial side to femoral prosthesis 1000 acts on the rear portion of body 100, and the action force of tibial side to the rear portion of body 100 can be decomposed into two forces, the first force is the force that makes the rear portion of body 100 move toward the distal side, and the second force is the force that the rear portion of body 100 is pressed toward the front side.If the anti-dislocation performance of femoral prosthesis 1000 is insufficient, femoral prosthesis 1000 will slide toward the distal side of femur along the rear portion of osteotomy surface 400 on body 100, thereby may cause femoral prosthesis 1000 to deviate from the installation position, cause the serious consequences such as needing renovation.

[0045] The femoral prosthesis 1000 according to the embodiment of the present invention is provided with a stopper at the rear of the osteotomy surface 400, and the stopper can interact with the bone cement in the bone cement groove 200. The stopper protrudes forward from the osteotomy surface 400, increasing the contact surface between the body 100 and the bone cement, so that the bone cement covering the stopper has a recessed portion opening toward the rear and proximal side, and the stopper can be engaged with the recessed portion of the bone cement.

[0046] When the femoral prosthesis 1000 slides toward the distal side under the action of the first force, that is, when the stopper slides toward the distal side along with the body 100, the recessed portion on the bone cement will play a certain blocking role in the sliding of the stopper toward the distal side. At the same time, the second force causes the rear part of the body 100 to be pressed toward the front side, that is, the stopper located at the rear of the osteotomy surface 400 is pressed toward the recessed portion of the bone cement, increasing the strength of the mutual engagement between the stopper and the recessed portion of the bone cement, and further blocking the sliding of the stopper toward the distal side. Therefore, the stopper can effectively block the possible sliding of the femoral prosthesis 1000, so that the femoral prosthesis 1000 is still not easy to deviate from the installation position even when the flexion degree of the knee joint is high.

[0047] Therefore, the femoral prosthesis 1000 according to the embodiment of the present invention has the advantage that it is not easy to deviate from the installation position when the flexion degree of the knee joint is high.

[0048] As used herein, the terms "proximal," "distal," "anterior," and "posterior" should be given their commonly understood anatomical interpretations. The term "proximal" refers to a direction generally toward the patient's torso, while "distal" refers to the opposite direction of proximal, i.e., away from the patient's torso. "Posterior" refers to the back of a patient, such as the back of a knee. Similarly, "anterior" refers to the front of a patient, such as the front of a knee. Thus, "posterior" refers to the opposite direction of "anterior."

[0049] It should be understood that the use of the terms "proximal" and "distal" should be interpreted as, although the device described herein is generally used with the knee flexed, the patient is standing with the knee straight. That is, the anterior side mentioned above refers to the anterior side when the patient is standing with the knee straight, the posterior side mentioned above refers to the posterior side when the patient is standing with the knee straight, the proximal side mentioned above refers to the proximal side when the patient is standing with the knee straight, and the distal side mentioned above refers to the distal side when the patient is standing with the knee straight. Figure 2 As shown by arrow A in Figure 2 As shown by arrow B in FIG.

[0050] like Figures 1 to 4 As shown, the femoral prosthesis 1000 according to the present invention includes a body 100, a column 300 and a stopper.

[0051] The body 100 has a bone cement groove 200 , and the bottom wall surface of the bone cement groove 200 is an osteotomy surface 400 . The column 300 is installed on the osteotomy surface 400 .

[0052] When installing the femoral prosthesis 1000, the column 300 is inserted into the femur to play a positioning role. The osteotomy surface 400 faces the femoral condyle, and bone cement is filled in the bone cement groove 200 to adhere the body 100 and the femur together.

[0053] The stopper is arranged at the rear of the osteotomy surface 400, and the stopper protrudes toward the front side from the osteotomy surface 400. The stopper at the rear of the osteotomy surface 400 interacts with the bone cement to prevent the body 100 from moving distally.

[0054] In one example of the present invention, the stopper extends along the width direction of the bone cement groove 200. By extending the stopper along the width direction of the bone cement groove 200 and increasing the length of the stopper in the width direction of the bone cement groove 200, the contact area between the stopper and the bone cement is increased, thereby increasing the effect of the stopper on preventing the body 100 from moving distally.

[0055] In another example of the present invention, there are multiple stoppers, which are spaced apart along the width direction and / or length direction of the bone cement groove 200. Thus, by increasing the number of stoppers, the contact area between the stoppers and the bone cement is increased, thereby increasing the effect of the stoppers on preventing the body 100 from moving distally.

[0056] like Figure 2 As shown, in some embodiments, the osteotomy surface 400 includes a posterior bevel 420 and a posterior condylar surface 430, the posterior bevel 420 is located on the front side of the posterior condylar surface 430, the proximal edge of the posterior bevel 420 is connected to the distal edge of the posterior condylar surface 430, and the stopper includes a first stopper 510 and a second stopper 520, the first stopper 510 is installed on the posterior bevel 420, and the second stopper 520 is installed on the posterior condylar surface 430, wherein the first stopper 510 protrudes from the posterior bevel 420 to the front side, and the second stopper 520 protrudes from the posterior condylar surface 430 to the front side.

[0057] The rear bevel 420 and the rear condylar surface 430 are different bevels located at the rear of the osteotomy surface 400. The rear bevel 420 is provided with a first stopper 510 to prevent the body 100 from moving distally, and the rear condylar surface 430 is provided with a second stopper 520 to prevent the body 100 from moving distally. The number of stoppers is increased by providing the first stopper 510 and the second stopper 520, thereby increasing the contact area between the stopper and the bone cement, so that the stopper has a stronger effect on preventing the body 100 from moving distally.

[0058] like Figure 3As shown, the first stop member 510 has a rear oblique anti-retreat surface 610 extending from the rear oblique surface 420 to the front side and to the proximal side. The rear oblique anti-retreat surface 610 extends from the rear oblique surface 420 to the front side and to the proximal side, that is, the rear oblique anti-retreat surface 610 is opposite to the front side and the distal side, so the rear oblique anti-retreat surface 610 has the function of blocking the body 100 from moving distally.

[0059] The second stop member 520 has a posterior condylar anti-recoil surface 630 extending from the posterior condylar surface 430 toward the front side and proximally. The posterior condylar anti-recoil surface 630 extends from the posterior condylar surface 430 toward the front side and proximally, that is, the posterior condylar anti-recoil surface 630 is opposite to the front side and the distal side. Therefore, the posterior condylar anti-recoil surface 630 has the function of blocking the body 100 from moving distally.

[0060] In some embodiments, the first stopper 510 and the second stopper 520 are triangular prism-shaped, and the first stopper 510 and the second stopper 520 have a first side edge, a second side edge and a third side edge, the second side edge is located between the first side edge and the third side edge in the proximal and distal directions, and the first side edge is located on the distal side of the third side edge;

[0061] like Figure 3 As shown, the first stop member 510 is in the shape of a triangular prism, the surface of the first stop member 510 located between the first side edge 511 of the first stop member 510 and the second side edge 512 of the first stop member 510 is a rear oblique anti-retreat surface 610, the surface of the first stop member 510 located between the third side edge 513 of the first stop member 510 and the second side edge 512 of the first stop member 510 is a first connecting surface 620, and the surface of the first stop member 510 located between the first side edge 511 of the first stop member 510 and the third side edge 513 of the first stop member 510 is connected to the rear oblique surface 420.

[0062] The second stopper 520 is in the shape of a triangular prism, and the surface of the second stopper 520 located between the first side edge 521 of the second stopper 520 and the second side edge 522 of the second stopper 520 is a posterior condylar anti-retreat surface 630, and the surface of the second stopper 520 located between the third side edge 523 of the second stopper 520 and the second side edge 522 of the second stopper 520 is a second connecting surface 640, and the surface of the second stopper 520 located between the first side edge 521 of the second stopper 520 and the third side edge 523 of the second stopper 520 is connected to the posterior condylar surface 430.

[0063] In some embodiments, the first stopper 510 and the second stopper 520 are quadrangular prism-shaped, and the first stopper 510 and the second stopper 520 have a fourth side edge, a fifth side edge, a sixth side edge and a seventh side edge in sequence, the fifth side edge is located at the front end of the fourth side edge, the sixth side edge and the seventh side edge in the front-to-back direction, and the fourth side edge is located at the far side of the fifth side edge and is adjacent to the fifth side edge;

[0064] The surface of the first stopper 510 located between the fourth side edge of the first stopper 510 and the fifth side edge of the first stopper 510 is a rear oblique anti-retraction surface 610, and the surface of the first stopper 510 located between the fourth side edge of the first stopper 510 and the seventh side edge of the first stopper 510 is connected to the rear oblique surface 420;

[0065] The surface of the second stopper 520 located between the fourth side edge of the second stopper 520 and the fifth side edge of the second stopper 520 is the posterior condyle anti-retreat surface 630, and the surface of the second stopper 520 located between the fourth side edge of the second stopper 520 and the seventh side edge of the second stopper 520 is connected to the posterior condyle surface 430.

[0066] It should be noted that the specific structure of the stopper of this embodiment may also be other structures that can enhance the anti-dislocation performance of the femoral prosthesis, and this embodiment is not limited to this.

[0067] In order to better illustrate the role of respectively setting the first stopper 510 and the second stopper 520 on the posterior inclined surface and the posterior condylar surface, the embodiment of the present invention further provides the following Figures 5 to 7 Verification data shown.

[0068] Figure 5 It is a test bar graph of the displacement of the femoral prosthesis when there is no defect in the bone cement or femur. Figure 5 The vertical axis in is the displacement of the femoral prosthesis. Figure 5 It can be seen that when the bone cement of the body 100 and the femur is not defective, when the posterior bevel 420 has no stopper, the dislocation displacement of the femoral prosthesis 1000 is large, and when the posterior bevel 420 has a stopper, the dislocation displacement of the femoral prosthesis 1000 is small. Therefore, when the bone cement of the body 100 and the femur is not defective, the stopper is provided on the posterior bevel 420 to improve the anti-dislocation performance of the femoral prosthesis 1000. Further, when the posterior bevel 420 and the posterior condylar surface 430 are both provided with stoppers, the dislocation displacement of the femoral prosthesis 1000 is minimal. It can be seen that compared with the absence of stoppers on both the posterior bevel and the posterior condylar surface, the anti-dislocation performance of the femoral prosthesis can be greatly improved by providing stoppers on both the posterior bevel 420 and the posterior condylar surface 430.

[0069] As time passes after the femoral prosthesis 1000 is implanted in the human body, defects may occur in the femur or bone cement. The embodiment of the present invention verifies the anti-dislocation performance when a 1 / 3 defect occurs in the femur or bone cement. Figure 6 This is a test bar graph of the displacement of the femoral prosthesis when the bone cement defect is 1 / 3. Figure 6It can be seen that after the defect amount of the bone cement adhering the body 100 to the femur reaches 1 / 3, the dislocation displacement of the femoral prosthesis 1000 without a stopper on both the posterior bevel 420 and the posterior condylar surface 430 is the largest, the dislocation displacement of the femoral prosthesis 1000 with a stopper on the posterior bevel 420 and without a stopper on the posterior condylar surface 430 is smaller, and the dislocation displacement of the femoral prosthesis 1000 with a stopper on both the posterior bevel 420 and the posterior condylar surface 430 is significantly reduced. Therefore, after the defect amount of the bone cement adhering the body 100 to the femur reaches 1 / 3, the anti-dislocation performance of the femoral prosthesis 1000 can be significantly improved by providing a stopper on both the posterior bevel 420 and the posterior condylar surface 430.

[0070] In order to further verify the anti-dislocation performance of the femoral prosthesis 1000 when a large defect occurs in the femur or bone cement, the embodiment of the present invention further produces verification data of the femoral prosthesis 1000 when the femur or bone cement has a complete defect. It can be understood that in actual applications, the situation when the femur or bone cement has a complete defect is a relatively extreme case. Figure 7 This is a test bar graph of the displacement of the femoral prosthesis when the bone cement is completely defective. Figure 7 It can be seen that after the bone cement adhering the body 100 to the femur is completely defective, the dislocation displacement of the femoral prosthesis 1000 without a stopper on both the posterior bevel 420 and the posterior condylar surface 430 is very large, and the dislocation displacement of the femoral prosthesis 1000 with a stopper on both the posterior bevel 420 and the posterior condylar surface 430 is smaller. Therefore, after the bone cement adhering the body 100 to the femur is completely defective, the anti-dislocation performance of the femoral prosthesis 1000 can be significantly improved by providing a stopper on both the posterior bevel 420 and the posterior condylar surface 430.

[0071] Based on the above analysis, it can be concluded that regardless of whether the femur or bone cement is intact, partially defective, or completely defective, providing a stopper on the posterior inclined surface 420 and the posterior condylar surface 430 can significantly improve the anti-dislocation performance of the femoral prosthesis 1000 and reduce the dislocation displacement of the femoral prosthesis 1000.

[0072] like Figure 3 and Figure 4 As shown, in some embodiments, the angle between the posterior oblique anti-recession surface 610 and the horizontal plane is a first angle α, and the angle between the posterior condylar anti-recession surface 630 and the horizontal plane is a second angle β.

[0073] The first angle α is within the range of 90°-180°, and the second angle β is within the range of 102°-180°. In other words, the angle α is greater than or equal to 90° and less than or equal to 180°, and the angle β is greater than or equal to 102° and less than or equal to 180°. Figure 4 As shown, the angle α is the angle at which the horizontal plane rotates clockwise to coincide with the posterior oblique anti-recession surface 610 , and the angle β is the angle at which the horizontal plane rotates clockwise to coincide with the posterior condylar anti-recession surface 630 .

[0074] When the first angle α is within the range of 90°-180°, the posterior oblique anti-recoil surface 610 has the function of blocking the body 100 from moving distally. When the second angle β is within the range of 102°-180°, the posterior condylar anti-recoil surface 630 has the function of blocking the body 100 from moving distally.

[0075] In some embodiments, the first angle α is within the range of 145°-155°, and the second angle β is within the range of 145°-155°. In other words, the angle α is greater than or equal to 145° and less than or equal to 155°, and the angle β is greater than or equal to 145° and less than or equal to 155°.

[0076] When the first included angle α between the posterior oblique anti-recoil surface 610 and the horizontal plane is within the range of 145°-155°, the posterior oblique anti-recoil surface 610 has a strong effect of blocking the body 100 from moving distally. When the second included angle β between the posterior condylar anti-recoil surface 630 and the horizontal plane is within the range of 145°-155°, the posterior condylar anti-recoil surface 630 has a strong effect of blocking the body 100 from moving distally.

[0077] In some embodiments, the posterior oblique anti-recoil surface 610 of the first stopper 510 is parallel to the posterior condyle anti-recoil surface 630 of the second stopper 520. This facilitates processing of the posterior oblique anti-recoil surface 610 of the first stopper 510 and the posterior condyle anti-recoil surface 630 of the second stopper 520.

[0078] In some embodiments, the first angle α between the posterior oblique anti-recoil surface 610 of the first stopper 510 and the horizontal plane is 150°, and the second angle β between the posterior condylar anti-recoil surface 630 of the second stopper 520 and the horizontal plane is 150°. After analysis, it is known that when the first angle α is 150°, the posterior oblique anti-recoil surface 610 has a better effect of blocking the body 100 from moving distally, and when the second angle β is 150°, the posterior condylar anti-recoil surface 630 has a better effect of blocking the body 100 from moving distally, that is, at this time, the femoral prosthesis has a higher anti-dislocation performance.

[0079] Specifically, Figure 8 1 is a test diagram showing the relationship between the angle between the anti-retraction surface of the femoral prosthesis 1000 and the horizontal plane and the dislocation displacement. Figure 8 As shown, the embodiment of the present invention also provides the dislocation distance verification data when the first angle α and the second angle β are at different angles. In order to reflect the dislocation of the femoral prosthesis 1000, when the first angle α and the second angle β are the same, the dislocation distances of the bottom and the top of the column 300 are measured respectively. Figure 8It can be seen that when the first angle α and the second angle β are close to 150°, the disengagement distance of the bottom and top of the column 300 gradually decreases. When the first angle α and the second angle β are 150°, the disengagement distance of the bottom and top of the column 300 is the smallest. Therefore, when the first angle α and the second angle β are 150°, the stopper can better prevent the body 100 from moving distally, that is, the femoral prosthesis has a higher anti-disengagement performance at this time.

[0080] Optionally, when the first angle α is 150°, the rear oblique anti-retraction surface 610 of the first stopper 510 is perpendicular to the rear oblique surface 420 , so that bone cement can enter the recessed position formed between the rear oblique anti-retraction surface 610 and the rear oblique surface 420 .

[0081] In some embodiments, the stopper extends along the width direction of the bone cement groove 200, the first stopper 510 has a first bottom surface and a second bottom surface, the second stopper 520 has a third bottom surface and a fourth bottom surface, the bone cement groove 200 has a first side wall surface 230 and a second side wall surface 240 opposite to each other in its width direction, the first bottom surface of the first stopper 510 is connected to the first side wall surface 230, the second bottom surface of the first stopper 510 is connected to the second side wall surface 240, the third bottom surface of the second stopper 520 is connected to the first side wall surface, and the fourth bottom surface of the second stopper 520 is connected to the second side wall surface 240.

[0082] The first stopper 510 is a triangular prism, and the first bottom surface and the second bottom surface are two bottom surfaces of the triangular prism, and the two bottom surfaces of the triangular prism are connected to the first side wall surface 230 and the second side wall surface 240 respectively, that is, the two ends of the first stopper 510 extending in the width direction of the bone cement groove 200 are fixed on the first side wall surface 230 and the second side wall surface 240 of the bone cement groove 200. Similarly, the two ends of the second stopper 520 extending in the width direction of the bone cement groove 200 are fixed on the first side wall surface 230 and the second side wall surface 240 of the bone cement groove 200. The two ends of the first stopper 510 extending in the width direction of the bone cement groove 200 are fixed on the first side wall surface 230 and the second side wall surface 240 of the bone cement groove 200, which can increase the structural strength of the first stopper 510 and make it less likely to deform. The two ends of the second stopper 520 extending along the width direction of the bone cement groove 200 are fixed on the first side wall surface 230 and the second side wall surface 240 in the width direction of the bone cement groove 200, which can increase the structural strength of the second stopper 520 and make it less likely to deform.

[0083] In some embodiments, the stopper extends along the width direction of the bone cement groove 200, a plurality of first stoppers 510 are provided, and the spacing of the first stoppers 510 in the extension direction of the bone cement groove 200 can be 3mm-5mm, and a plurality of second stoppers 520 are provided, and the spacing of the second stoppers 520 in the extension direction of the bone cement groove 200 can be 3mm-5mm. Arranging a plurality of first stoppers 510 and second stoppers 520 in the extension direction of the bone cement groove 200 can further prevent the body 100 from moving distally. Sufficient spacing is provided between the plurality of first stoppers 510 to ensure that sufficient bone cement can be filled between the plurality of first stoppers 510, so that the first stoppers 510 can interact with the bone cement. Sufficient spacing is provided between the plurality of second stoppers 520 to ensure that sufficient bone cement can be filled between the plurality of second stoppers 520, so that the first stoppers 510 can interact with the bone cement.

[0084] Optionally, the number of the first stoppers 510 is two, and the number of the second stoppers 520 is three.

[0085] In some embodiments, the depth of the bone cement groove 200 is less than or equal to 2 mm; the thickness of the stopper is between 0.3 mm and 1 mm, and the thickness of the stopper is between 0.3 mm and 1 mm, which means that the distance from any point on the second side edge to the osteotomy surface 400 is between 0.3 mm and 1 mm, and the thickness of the stopper is greater than or equal to 0.3 mm, so that the stopper has a sufficient contact area with the bone cement. The thickness of the stopper is less than or equal to 1 mm to ensure that the stopper has sufficient structural strength and will not exceed the bone cement groove 200.

[0086] Optionally, the thickness of the stopper is 0.35 mm.

[0087] Optionally, the osteotomy surface 400 further includes a distal surface 410, the rear side edge of the distal surface 410 is connected to the front side edge of the rear inclined surface 420, and the column 300 is installed on the distal surface 410. When the femoral prosthesis 1000 is installed, the column 300 plays a positioning role.

[0088] A femoral prosthesis 1000 according to a specific example of the present invention will be described below with reference to the accompanying drawings.

[0089] like Figures 1 to 4 As shown, the femoral prosthesis 1000 according to the present invention includes a body 100, a column 300 and a stopper.

[0090] The body 100 has a bone cement groove 200, and the bottom wall surface of the bone cement groove 200 is an osteotomy surface 400. The osteotomy surface 400 faces the femoral condyle, and bone cement is filled in the bone cement groove 200 to adhere the body 100 to the femur.

[0091] The stopper is arranged at the rear of the osteotomy surface 400, and the stopper protrudes forward from the osteotomy surface 400. The stopper at the rear of the osteotomy surface 400 interacts with the bone cement, and the stopper protrudes forward from the osteotomy surface 400 to block the body 100 from moving distally.

[0092] like Figure 2 As shown, the osteotomy surface 400 includes a rear bevel 420, a rear condylar surface 430, and a distal surface 410. The rear edge of the distal surface 410 is connected to the front edge of the rear bevel 420, and the column 300 is installed on the distal surface 410. The rear bevel 420 is located at the front side of the rear condylar surface 430, and the proximal edge of the rear bevel 420 is connected to the distal edge of the rear condylar surface 430. The stopper includes a first stopper 510 and a second stopper 520, the first stopper 510 is installed on the rear bevel 420, and the second stopper 520 is installed on the rear condylar surface 430, wherein the first stopper 510 protrudes from the rear bevel 420 to the front side, and the second stopper 520 protrudes from the rear condylar surface 430 to the front side.

[0093] The rear bevel 420 and the rear condylar surface 430 are different bevels located at the rear of the osteotomy surface 400. The rear bevel 420 is provided with a first stopper 510 to prevent the body 100 from moving distally, and the rear condylar surface 430 is provided with a second stopper 520 to prevent the body 100 from moving distally. The number of stoppers is increased by providing the first stopper 510 and the second stopper 520, thereby increasing the contact area between the stopper and the bone cement, so that the stopper has a stronger effect on preventing the body 100 from moving distally.

[0094] The stopper extends along the width direction of the bone cement groove 200, the first stopper 510 has a first bottom surface and a second bottom surface, the second stopper 520 has a third bottom surface and a fourth bottom surface, the bone cement groove 200 has a first side wall surface 230 and a second side wall surface 240 opposite to each other in its width direction, the first bottom surface of the first stopper 510 is connected to the first side wall surface 230, the second bottom surface of the first stopper 510 is connected to the second side wall surface 240, the third bottom surface 524 of the second stopper 520 is connected to the first side wall surface 230, and the fourth bottom surface of the second stopper 520 is connected to the second side wall surface 240.

[0095] Both ends of the first stopper 510 and the second stopper 520 extending in the width direction of the bone cement groove 200 are fixed on the first side wall surface 230 and the second side wall surface 240 of the bone cement groove 200, which can increase the structural strength of the first stopper 510 and make it less likely to deform.

[0096] like Figure 3As shown, the first stopper 510 is in the shape of a triangular prism, and the surface of the first stopper 510 between the first side edge 511 of the first stopper 510 and the second side edge 512 of the first stopper 510 is a rear oblique anti-recoil surface 610. The rear oblique anti-recoil surface 610 extends from the rear oblique surface 420 toward the front side and toward the proximal side, that is, the rear oblique anti-recoil surface 610 is opposite to the front side and the distal side, so the rear oblique anti-recoil surface 610 has the function of blocking the body 100 from moving toward the distal side.

[0097] The surface of the first stopper 510 located between the third side edge 513 of the first stopper 510 and the second side edge 512 of the first stopper 510 is the first connecting surface 620, and the surface of the first stopper 510 located between the first side edge 511 of the first stopper 510 and the third side edge 513 of the first stopper 510 is connected to the rear bevel 420.

[0098] The second stopper 520 is in the shape of a triangular prism, and the surface of the second stopper 520 between the first side edge 521 and the second side edge 522 of the second stopper 520 is a posterior condyle anti-recoil surface 630. The posterior condyle anti-recoil surface 630 extends from the posterior condyle surface 430 toward the front side and toward the proximal side, that is, the posterior condyle anti-recoil surface 630 is opposite to the front side and the distal side, so the posterior condyle anti-recoil surface 630 has the function of blocking the body 100 from moving toward the distal side.

[0099] The surface of the second stopper 520 located between the third side edge 523 of the second stopper 520 and the second side edge 522 of the second stopper 520 is the second connecting surface 640, and the surface of the second stopper 520 located between the first side edge 521 of the second stopper 520 and the third side edge 523 of the second stopper 520 is connected to the posterior condylar surface 430.

[0100] The first included angle α between the rear oblique anti-recoil surface 610 of the first stopper 510 and the horizontal plane is 150°, and the second included angle β between the rear condyle anti-recoil surface 630 of the second stopper 520 and the horizontal plane is 150°. When the first included angle α is 150°, the rear oblique anti-recoil surface 610 has the best effect of blocking the body 100 from moving distally, and when the second included angle β is 150°, the rear condyle anti-recoil surface 630 has the best effect of blocking the body 100 from moving distally.

[0101] The number of the first stoppers 510 is 2, and the number of the second stoppers 520 is 3. The spacing between the first stoppers 510 in the extending direction of the bone cement groove 200 is 4 mm, and the spacing between the second stoppers 520 in the extending direction of the bone cement groove 200 is 4 mm.

[0102] The depth of the bone cement groove 200 is equal to 2 mm. The thickness of the stopper is 0.35 mm, that is, the distance from any point on the second side edge to the osteotomy surface 400 is 0.35 mm.

[0103] In the description of the present invention, it is to 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”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0104] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0105] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0106] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0107] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. 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 described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0108] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A femoral prosthesis, characterized in that: include: A main body, wherein the main body has a bone cement groove, and the bottom wall surface of the bone cement groove is an osteotomy surface; A column, the column being mounted on the osteotomy surface; and A stopper is arranged at the rear of the osteotomy surface, and the stopper protrudes from the front side of the osteotomy surface, wherein The stopper extends along the width direction of the bone cement groove; Alternatively, there are a plurality of stoppers, and the plurality of stoppers are arranged at intervals along the width direction and / or length direction of the bone cement groove.

2. The femoral prosthesis according to claim 1, characterized in that: The osteotomy surface includes a posterior bevel and a posterior condylar surface, the posterior bevel is located at the front side of the posterior condylar surface, the proximal edge of the posterior bevel is connected to the distal edge of the posterior condylar surface, and the stopper includes a first stopper and a second stopper; The first stopper is installed on the rear inclined surface and protrudes forward from the rear inclined surface, and the second stopper is installed on the rear condyle surface and protrudes forward from the rear condyle surface.

3. The femoral prosthesis according to claim 2, characterized in that: The osteotomy surface further comprises a distal surface, the rear edge of the distal surface is connected to the front edge of the rear inclined surface, and the column is installed on the distal surface.

4. The femoral prosthesis according to claim 2, characterized in that: The first stopper has a rear oblique anti-recoil surface extending from the rear oblique surface toward the front side and toward the proximal side, and the angle between the rear oblique anti-recoil surface and the horizontal plane is a first angle α; The second stopper has a posterior condyle retreat prevention surface extending from the posterior condyle surface toward the front and toward the proximal side, and the angle between the posterior condyle retreat prevention surface and the horizontal plane is a second angle β.

5. The femoral prosthesis according to claim 4, characterized in that: The first stopper and the second stopper are triangular prism-shaped, and have a first side edge, a second side edge and a third side edge, the second side edge is located between the first side edge and the third side edge in the near-far direction, and the first side edge is located on the far side of the third side edge; The surface of the first stopper located between the first side edge of the first stopper and the second side edge of the first stopper is the rear oblique anti-retraction surface, and the surface of the first stopper located between the first side edge of the first stopper and the third side edge of the first stopper is connected to the rear oblique surface; The surface of the second stopper located between the first side edge of the second stopper and the second side edge of the second stopper is the posterior condyle anti-retreat surface, and the surface of the second stopper located between the first side edge of the second stopper and the third side edge of the second stopper is connected to the posterior condyle surface.

6. The femoral prosthesis according to claim 4, characterized in that: The first stopper and the second stopper are in the shape of a quadrangular prism, and the first stopper and the second stopper have a fourth side edge, a fifth side edge, a sixth side edge and a seventh side edge in sequence, the fifth side edge is located at the front end of the fourth side edge, the sixth side edge and the seventh side edge in the front-back direction, and the fourth side edge is located at the far side of the fifth side edge and is adjacent to the fifth side edge; The surface of the first stopper located between the fourth side edge of the first stopper and the fifth side edge of the first stopper is the rear oblique anti-retreat surface, and the surface of the first stopper located between the fourth side edge of the first stopper and the seventh side edge of the first stopper is connected to the rear oblique surface; The surface of the second stopper located between the fourth lateral edge of the second stopper and the fifth lateral edge of the second stopper is the posterior condyle anti-retreat surface, and the surface of the second stopper located between the fourth lateral edge of the second stopper and the seventh lateral edge of the second stopper is connected to the posterior condyle surface.

7. The femoral prosthesis according to any one of claims 4 to 6, characterized in that: The first angle α is within the range of 90°-180°, and / or the second angle β is within the range of 102°-180°.

8. The femoral prosthesis according to any one of claims 4 to 6, characterized in that: The first angle α is within the range of 145°-155°, and / or the second angle β is within the range of 145°-155°.

9. The femoral prosthesis according to claim 8, characterized in that: The posterior oblique anti-recession surface is parallel to the posterior condylar anti-recession surface; and / or, the first angle α is 150°, and the second angle β is 150°.

10. The femoral prosthesis according to claim 2, characterized in that: There are multiple first stoppers, each of which extends along the width direction of the bone cement groove, and the spacing between the first stoppers in the extending direction of the bone cement groove is 3mm-5mm; and / or, There are multiple second stoppers, each of which extends along the width direction of the bone cement groove, and the spacing between the second stoppers in the extending direction of the bone cement groove is 3mm-5mm.

11. The femoral prosthesis according to claim 10, characterized in that: The number of the first stoppers is two, and the number of the second stoppers is three.

12. The femoral prosthesis according to any one of claims 1 to 6 and 10, characterized in that: The depth of the bone cement groove is less than or equal to 2 mm; the thickness of the stopper is between 0.3 mm and 1 mm.

13. The femoral prosthesis according to claim 12, characterized in that: The thickness of the stopper is 0.35 mm.

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