Gasket prosthesis and artificial knee joint prosthesis having the same

Abstract

The present invention discloses a cushion prosthesis and an artificial knee joint prosthesis having the same. The cushion prosthesis includes a body, a convex portion and a buckle. The body has a first surface, and the first surface includes a front edge, a curved edge, a rear edge and a straight edge that are sequentially connected; the convex portion is provided on the first surface of the body; the buckle is provided on the first surface of the body, and the buckle extends along a second direction, and the included angle between the second direction and the first direction is an acute angle; The cushion prosthesis according to the embodiment of the present invention has the advantages of strong clamping force, not easy to cause deformation, and not easy to fall off from the tibial tray platform.

Description

Technical Field

[0001] The present invention relates to medical devices, and particularly to a cushion prosthesis and an artificial knee joint prosthesis having the same. Background Art

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

[0003] During unicompartmental surgery, the minimally invasive incision results in a narrow field of view and actual operating space. For fixed-platform type products, if the tibial plateau and the cushion are integrated, it will be impossible to clean the posterior bone cement after installing the tibial-side product. To solve this problem, when installing the tibial-side product, it is often necessary to first install the tibial plateau product and then deal with the bone cement. Since there is no cushion at this time, the posterior bone cement can be freely processed. After the treatment is completed, the cushion is installed. Since the tibial contour is very different from the total knee contour, after installing the cushion in unicompartmental knee arthroplasty, the cushion and the tibial plateau need to be firmly connected and not easily separated. A clamping method of the tibial plateau and the cushion that meets the requirements of unicompartmental knee arthroplasty and has a strong clamping force is required. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to some extent. For this purpose, an embodiment of the present invention provides a cushion prosthesis.

[0005] The cushion prosthesis according to an embodiment of the present invention includes:

[0006] A body, the body having a first surface, the first surface including a front edge, a curved edge, a rear edge, and a straight edge connected in sequence, the front edge and the rear edge being opposite in the front-rear direction, the curved edge and the straight edge being opposite in a first direction, a distance between the curved edge and the straight edge in the first direction increasing first and then decreasing along a direction from the rear to the front, the first direction being perpendicular to the front-rear direction;

[0007] A convex portion, the convex portion being provided on the first surface of the body; and

[0008] A buckle is provided on the first surface of the body. The buckle extends in a second direction, and the angle between the second direction and the first direction is an acute angle. The buckle has a first end and a second end that are opposite to each other in the first direction. The first end is adjacent to the straight edge relative to the second end in the first direction, and the first end is adjacent to the foremost end of the front edge relative to the second end in the front-rear direction. The maximum distance between the second end and the front edge in the front-rear direction is a first distance, and the maximum distance between the rear edge and the front edge in the front-rear direction is a second distance. The ratio of the first distance to the second distance is 1:(3 - 4).

[0009] The cushion prosthesis according to the embodiment of the present invention has the advantages of strong clamping force, not easily causing deformation, and not easily falling off from the tibial tray platform.

[0010] In some embodiments, the angle between the second direction and the first direction is greater than or equal to 25 degrees and less than or equal to 35 degrees. Optionally, the angle between the second direction and the first direction is 30 degrees.

[0011] In some embodiments, the maximum distance between the first end and the second end in the second direction is 6 mm - 12.5 mm. Optionally, the maximum distance between the first end and the second end in the second direction is 8.5 mm.

[0012] In some embodiments, the peripheral surface of the protrusion portion includes a front surface, a curved side surface, a rear surface, and a straight side surface that are sequentially connected. The straight side surface constitutes a first guiding surface, and a part of the curved side surface is parallel to the straight side surface to constitute a second guiding surface.

[0013] In some embodiments, a clamping protrusion is provided on the rear surface of the protrusion portion, and the clamping protrusion is away from the first surface.

[0014] In some embodiments, the protrusion portion and the buckle are spaced apart, and an avoidance groove is defined between the protrusion portion and the buckle. The avoidance groove extends in the second direction.

[0015] In some embodiments, the peripheral surface of the protrusion portion includes a front surface, a curved side surface, a rear surface, and a straight side surface that are sequentially connected. A first front protrusion is included on the front surface. The first front protrusion is located between the straight side surface and the groove surface of the avoidance groove, and a part of the first front protrusion is located on the front side of the buckle.

[0016] The present invention also provides an artificial knee joint prosthesis, which includes:

[0017] Tibial tray platform, the tibial tray platform includes a bottom plate and a flange provided on the bottom plate, a receiving groove is defined between the bottom plate and the flange, the flange includes a front enclosure, a curved enclosure, a rear enclosure and a straight enclosure connected in sequence, a front card slot and a first front convex groove are provided on the rear surface of the front enclosure, and a rear card slot is provided on the front surface of the rear enclosure; and

[0018] Padding prosthesis, the padding prosthesis is the above-mentioned padding prosthesis, the convex part of the padding prosthesis can be fitted in the receiving groove, the buckle of the padding prosthesis can be engaged in the front card slot, the card convex part can be engaged in the rear card slot, a first front convex groove is provided on the rear surface of the front enclosure, and the first front protrusion of the padding prosthesis can be fitted in the first front convex groove.

[0019] In some embodiments, the inner side surface of the straight enclosure constitutes a third guiding surface, the third guiding surface can cooperate with the first guiding surface of the padding prosthesis, a part of the inner side surface of the curved enclosure is parallel to the inner side surface of the straight enclosure so as to constitute a fourth guiding surface, and the fourth guiding surface can cooperate with the second guiding surface of the padding prosthesis.

[0020] In some embodiments, the front surface of the tibial tray platform is provided with a first groove and a grasping groove, the first groove is located above the grasping groove, the front surface of the body is provided with a second groove, wherein the upper end of the first groove is open, the lower end of the second groove is open, and the first groove and the second groove are oppositely arranged in the up-down direction so as to form a removal groove. Description of the Drawings

[0021] Figure 1 is a schematic diagram of a three-dimensional view of an artificial knee joint prosthesis according to an embodiment of the present invention.

[0022] Figure 2 is a schematic diagram of a three-dimensional view of an artificial knee joint prosthesis according to an embodiment of the present invention.

[0023] Figure 3 is a schematic diagram of a bottom view of a padding prosthesis according to an embodiment of the present invention.

[0024] Figure 4 is a schematic diagram of a top view of a tibial tray platform according to an embodiment of the present invention.

[0025] Figure 5 is a schematic diagram of a bottom view of a tibial tray prosthesis according to an embodiment of the present invention.

[0026] Figure 6 is a schematic diagram of a side view of a straight enclosure of a tibial tray platform according to an embodiment of the present invention.

[0027] Figure 7It is a schematic side view of the curved edge enclosure of the tibial tray platform according to an embodiment of the present invention.

[0028] Figure 8 It is a schematic cross-sectional view of the tibial tray platform according to an embodiment of the present invention. Detailed implementation manners

[0029] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0030] The cushion prosthesis 1000 according to an embodiment of the present invention will be described below with reference to the accompanying drawings. As Figures 1 to 8 shown, the cushion prosthesis 1000 according to an embodiment of the present invention includes a body 1100, a protrusion 1200, and a buckle 1300.

[0031] The body 1100 has a first surface 1110. The first surface 1110 includes a front edge 1101, a curved edge 1102, a rear edge 1103, and a straight edge 1104 that are connected in sequence. The front edge 1101 and the rear edge 1103 are opposite in the front-rear direction. The curved edge 1102 and the straight edge 1104 are opposite in the first direction. The distance between the front edge 1101 and the straight edge 1104 in the first direction first increases and then decreases along the direction from the rear to the front. The first direction is perpendicular to the front-rear direction.

[0032] The protrusion 1200 is provided on the first surface 1110 of the body 1100. The buckle 1300 is provided on the first surface 1110 of the body 1100. The buckle 1300 extends along a second direction. The angle between the second direction and the first direction is an acute angle. The buckle 1300 has a first end 1301 and a second end 1302 that are opposite in the second direction. The first end 1301 is adjacent to the straight edge 1104 relative to the second end 1302 in the first direction. The first end 1301 is adjacent to the foremost end of the front edge 1101 relative to the second end 1302 in the front-rear direction. The maximum distance between the second end 1302 and the front edge 1101 in the front-rear direction is a first distance. The maximum distance between the rear edge 1103 and the front edge 1101 in the front-rear direction is a second distance. The ratio of the first distance to the second distance is 1:(3 - 4).

[0033] The front-rear direction is the same as the front-rear direction of the human knee joint. The first direction is the same as the inner-outer direction of the human knee joint. The first direction is as shown by the arrow A in Figure 3 , the front-rear direction is as shown by the arrow B in Figure 3 , the up-down direction is as shown by the arrow C in Figure 7 , and the second direction is as shown by the arrow D in Figure 3 .

[0034] In a unicompartmental knee arthroplasty, the insert prosthesis 1000 is mounted on the tibial tray platform 2000, and the convex portion 1200 cooperates with the receiving groove 2201 of the tibial tray platform 2000. Since the ratio of the first distance to the second distance is 1:(3 - 4), the buckle 1300 is provided on the first part of the first surface 1110 adjacent to the front edge 1101. Since the distance between the curved edge 1102 and the straight edge 1104 in the first direction first increases and then decreases along the direction from the back to the front, the size of this first part of the first surface 1110 in the first direction is smaller.

[0035] Therefore, the setting range left for the buckle 1300 is small. If the buckle 1300 extends along this first direction, the length of the buckle 1300 is also small. However, the insert prosthesis 1000 requires a large clamping force provided by the buckle 1300 to ensure that it is difficult to fall off the tibial tray platform 2000, and the length of the buckle 1300 is proportional to the clamping force provided by the buckle 1300.

[0036] According to an embodiment of the present invention, the insert prosthesis 1000 enables the buckle 1300 to extend along a second direction, and the angle between the second direction and the first direction is an acute angle, so that the buckle 1300 can be obliquely arranged on the first surface 1110 of the body 1100 relative to the first direction. Thus, the size of the buckle 1300 in the second direction can be made larger than the size of the buckle 1300 in the first direction. Therefore, compared with the buckle extending along the first direction, the buckle 1300 extending along the second direction has a longer length, and thus can provide a greater clamping force. And compared with the buckle extending along the first direction, the buckle 1300 extending along the second direction is obliquely arranged compared with the front - back direction. The buckle 1300 extending along the second direction is not easily deformed and displaced when bearing the force in the front - back direction, so that the insert prosthesis 1000 can be more firmly clamped on the tibial tray platform 2000.

[0037] Therefore, the insert prosthesis 1000 according to an embodiment of the present invention has the advantages of strong clamping force, not being easily deformed, and not being easily detached from the tibial tray platform 2000.

[0038] As Figures 1 to 8 shown, the present application also provides an artificial knee prosthesis. The tibial tray prosthesis according to an embodiment of the present invention includes the tibial tray platform 2000 and the above - mentioned insert prosthesis 1000.

[0039] The tibial tray platform 2000 includes a bottom plate 2100 and a flange 2200.

[0040] The upper surface of the bottom plate 2100 is a flat surface, and the flange 2200 is provided on the upper surface of the bottom plate 2100, and the flange 2200 is integrally formed with the bottom plate 2100.

[0041] The flange 2200 includes a front retaining wall 2210, a curved retaining wall 2220, a rear retaining wall 2230, and a straight retaining wall 2240 that are connected in sequence. At least a part of the upper surface 2211 of the front retaining wall 2210 and the upper surface of the straight retaining wall 2240 are on the same horizontal plane. The upper surface 2231 of the rear retaining wall 2230 is below the upper surface 2211 of the front retaining wall 2210. The upper surface 2221 of the curved retaining wall 2220 is an inclined plane. The front edge of the curved retaining wall 2220 is connected to the upper surface 2211 of the front retaining wall 2210, and the rear edge of the curved retaining wall 2220 is connected to the upper surface 2231 of the rear retaining wall 2230. The front edge of the curved retaining wall 2220 is above the rear edge of the curved retaining wall 2220.

[0042] The height of the rear retaining wall 2230 is lower than that of the front retaining wall 2210. The upper surface 2221 of the curved retaining wall 2220 is an inclined plane connecting the upper surface 2211 of the front retaining wall 2210 and the upper surface 2231 of the rear retaining wall 2230. The curved retaining wall 2220 is a retaining wall with a smoothly decreasing height from the front end to the rear end. After the tibial tray platform 2000 is installed, the upper surface at the rear end of the tibial tray platform 2000 is lower, increasing the space at the postoperative side and providing more space for cleaning the bone cement at the postoperative side.

[0043] The front retaining wall 2210, the curved retaining wall 2220, the rear retaining wall 2230, and the straight retaining wall 2240 that are connected in sequence and the bottom plate define a receiving groove 2201.

[0044] The cushion prosthesis 1000 and the tibial tray platform 2000 can cooperate with each other, and the convex portion 1200 can fit into the receiving groove 2201. The fact that the cushion prosthesis 1000 and the tibial tray platform 2000 can cooperate with each other and the convex portion 1200 can fit into the receiving groove 2201 means that when performing a unicompartmental surgery, the cushion prosthesis 1000 and the tibial tray platform 2000 cooperate with each other so that the cushion prosthesis 1000 is installed on the tibial tray platform 2000, and the convex portion 1200 fits into the receiving groove 2201. When the unicompartmental surgery is not performed, that is, when the cushion prosthesis 1000 and the tibial tray platform 2000 are not used, the cushion prosthesis 1000 can cooperate with the tibial tray platform 2000 or not, and the convex portion 1200 can fit into the receiving groove 2201 or not.

[0045] Optionally, the shape of the receiving groove 2201 is adapted to the shape of the convex portion 1200 so that 2201 can fit more stably into 1200.

[0046] The buckle 1300 can be engaged in the front card slot 2302. That the buckle 1300 can be engaged in the front card slot 2302 means that when performing unicondylar surgery, the convex portion 1200 is fitted in the receiving groove 2201 and the buckle 1300 is engaged in the front card slot 2302; when unicondylar surgery is not performed, that is, when the cushion prosthesis 1000 and the tibial tray platform 2000 are not used, the buckle 1300 can be engaged in the front card slot 2302 or can also not be engaged in the front card slot 2302.

[0047] As Figure 3 shown, in some embodiments, the peripheral surface of the convex portion 1200 includes a front surface 1201, a curved side surface 1202, a rear surface 1203, and a straight side surface 1204 that are connected in sequence. The straight side surface 1204 constitutes the first guiding surface 1400, and a part of the curved side surface 1202 is parallel to the straight side surface 1204 so as to constitute the second guiding surface 1401.

[0048] As Figure 8 shown, the inner side surface of the straight-edge enclosure 2240 constitutes the third guiding surface 2304. The inner side surface of the straight-edge enclosure 2240 refers to the side surface of the straight-edge enclosure 2240 adjacent to the receiving groove 2201, that is, the inner side surface of the straight-edge enclosure 2240 is a part of the circumferential wall surface of the receiving groove 2201. The third guiding surface 2304 can cooperate with the first guiding surface 1400 of the cushion prosthesis 1000, and a part of the inner side surface of the curved-edge enclosure 2220 is parallel to the inner side surface of the straight-edge enclosure 2240 so as to constitute the fourth guiding surface 2305. The inner side surface of the curved-edge enclosure 2220 refers to the side surface of the curved-edge enclosure 2220 adjacent to the receiving groove 2201, that is, the inner side surface of the curved-edge enclosure 2220 is a part of the circumferential wall surface of the receiving groove 2201. The fourth guiding surface 2305 can cooperate with the second guiding surface of the cushion prosthesis 1000.

[0049] That the third guiding surface 2304 can cooperate with the first guiding surface 1400 and the fourth guiding surface 2305 can cooperate with the second guiding surface means that when performing unicondylar surgery, during the process of installing the cushion prosthesis 1000 onto the tibial tray platform 2000, the first guiding surface 1400 moves (slides) closely against the third guiding surface 2304 so as to cooperate with the third guiding surface 2304, and the second guiding surface moves (slides) closely against the fourth guiding surface 2305 so as to cooperate with the fourth guiding surface 2305. When unicondylar surgery is not performed, that is, when 1000 and 2000 are not used, the first guiding surface 1400 can cooperate with the third guiding surface 2304 or can also not cooperate with the third guiding surface 2304, and the second guiding surface can cooperate with the fourth guiding surface 2305 or can also not cooperate with the fourth guiding surface 2305.

[0050] During the process of installing the cushion prosthesis 1000 onto the tibial tray platform 2000, the cushion prosthesis 1000 is guided by moving (sliding) the first guiding surface 1400 closely against the third guiding surface 2304 and the second guiding surface closely against the fourth guiding surface 2305, facilitating the installation of the cushion prosthesis 1000 into the tibial tray platform 2000.

[0051] As Figure 2 shown, in some embodiments, a locking projection 1208 is provided on the rear surface 1203 of the convex portion 1200 of the cushion prosthesis 1000, and the locking projection 1208 is away from the first surface 1110. That is to say, the locking projection 1208 is provided on the portion of the rear surface 1203 away from the first surface 1110. A rear card slot 2303 is provided on the front surface of the rear enclosure 2230 of the tibial tray platform 2000, and the locking projection 1208 can be engaged with the rear card slot 2303. The locking projection 1208 can be engaged with the rear card slot 2303 means that: when performing a unicompartmental surgery, the convex portion 1200 is fitted in the receiving groove 2201, and the locking projection 1208 is engaged in the rear card slot 2303; when the unicompartmental surgery is not performed, that is, when the cushion prosthesis 1000 and the tibial tray platform 2000 are not used, the locking projection 1208 can be engaged in the rear card slot 2303 or not engaged in the rear card slot 2303.

[0052] The locking projection 1208 is away from the first surface 1110. Therefore, the rear card slot 2303 is provided at a position of the rear enclosure 2230 close to the bottom plate 2100, so that the position of the rear card slot 2303 is adapted to the position of the locking projection 1208. The position of the rear card slot 2303 being close to the bottom plate 2100 is provided to make the rear enclosure 2230 have higher structural strength and be more stable when receiving the cushion prosthesis 1000.

[0053] As Figure 1 shown, in some embodiments, a first groove 2300 and a grasping groove 2301 are provided on the front surface of the tibial tray platform 2000. The first groove 2300 is located above the grasping groove 2301. A second groove 1402 is provided on the front surface of the body 1100. The upper end of the first groove 2300 is open, and the lower end of the second groove 1402 is open. The first groove 2300 and the second groove 1402 are arranged opposite to each other in the up-down direction to form a removal groove. Optionally, the grasping groove 2301 is provided in the middle of the front surface of the tibial tray platform 2000, and the first groove 2300 is provided in the upper part of the front surface of the tibial tray platform 2000.

[0054] When performing unicondylar surgery, the holder fixes the tibial tray platform 2000 by inserting and clamping the holding groove 2301, and then moves the tibial tray platform 2000 to the appropriate position. When it is found that the already engaged cushion prosthesis 1000 and the tibial tray platform 2000 need to be separated, a separator is used to insert into the removal groove to separate the already engaged cushion prosthesis 1000 and the tibial tray platform 2000. After removing the cushion prosthesis 1000 that needs to be replaced, a more suitable cushion prosthesis 1000 is selected for reinstallation. By providing the removal groove, it is more convenient to remove the cushion prosthesis 1000 that needs to be replaced.

[0055] As Figure 3 shown, in some embodiments, the protrusion 1200 and the buckle 1300 are spaced apart, and a relief groove 1205 is defined between the protrusion 1200 and the buckle 1300. The relief groove 1205 extends in the second direction, and the maximum distance between the relief groove 1205 and the front edge 1101 in the front-rear direction is less than or equal to the first distance.

[0056] The relief groove 1205 is provided between the protrusion 1200 and the buckle 1300, providing a space for elastic deformation of the buckle 1300, so that the buckle 1300 can have a greater degree of deformation when engaging into the front card slot 2302, facilitating the smooth entry of the buckle 1300 into the front card slot 2302. The relief groove 1205 provides the necessary operating space for the tool to process the buckle 1300, thereby reducing the processing difficulty of the buckle 1300.

[0057] As Figure 3 shown, optionally, the circumferential surface of the protrusion 1200 includes a front surface 1201, a curved side surface 1202, a rear surface 1203, and a straight side surface 1204 connected in sequence. The front surface 1201 includes a first front protrusion 1206, and the first front protrusion 1206 is located between the straight side surface 1204 and the groove surface of the relief groove 1205, and a part of the first front protrusion 1206 is located in front of the buckle 1300. Specifically, the distance from the front end of the first front protrusion 1206 to the front end of the front edge 1101 is less than the distance from the front end of the buckle 1300 to the front end of the front edge 1101. The front surface 1201 further includes a second front protrusion 1207, and the second front protrusion 1207 is located between the curved side surface 1202 and the groove surface of the relief groove 1205.

[0058] As Figure 8 shown, a first front convex groove 2306 is provided on the rear surface of the front enclosure 2210, and the first front convex groove 2306 cooperates with the first front protrusion 1206. When the cushion prosthesis 1000 is fastened to the tibial tray platform 2000, the cooperation between the first front protrusion 1206 and the first front convex groove 2306 can reduce the moving distance of the cushion prosthesis 1000 in the front-rear direction under the action of force.

[0059] On the rear surface of the front enclosure 2210, there is a second front convex groove 2307 that cooperates with the second front protrusion 1207. When the cushion prosthesis 1000 is buckled on the tibial tray platform 2000, the cooperation between the second front protrusion 1207 and the second front convex groove 2307 can reduce the moving distance of the cushion prosthesis 1000 in the front-rear direction under the action of force.

[0060] The cooperation between the first front protrusion 1206 and the first front convex groove 2306, and the cooperation between the second front protrusion 1207 and the second front convex groove 2307 mean that: when performing a unicompartmental surgery, the first front protrusion 1206 fits into the first front convex groove 2306, and the second front protrusion 1207 fits into the second front convex groove 2307; when no unicompartmental surgery is performed, that is, when the cushion prosthesis 1000 and the tibial tray platform 2000 are not used, the first front protrusion 1206 can fit into the first front convex groove 2306 or not, and the second front protrusion 1207 can fit into the second front convex groove 2307 or not.

[0061] The cooperation between the first front protrusion 1206 and the first front convex groove 2306, and the cooperation between the second front protrusion 1207 and the second front convex groove 2307 result in a relatively small relative displacement between the cushion prosthesis 1000 and the tibial tray platform 2000 in the front-rear direction, with less impact on the human body and ensuring the normal operation of the prosthesis.

[0062] As Figure 3 shown, in some embodiments, the angle between the second direction and the first direction is greater than or equal to 25 degrees and less than or equal to 35 degrees. Optionally, the angle between the second direction and the first direction is 30 degrees.

[0063] Since the distance between the curved edge 1102 and the straight edge 1104 in the first direction first increases and then decreases in the direction from back to front, the size of this first part of the first surface 1110 in the first direction is smaller. Therefore, the setting range for the buckle 1300 is smaller. Considering the shape of the front end of the body 1100, the need to increase the length of the buckle 1300, and the need to leave a proper space for the first front protrusion 1206 in the first direction, an angle of 30 degrees between the second direction and the first direction is the optimal angle, and an angle range of greater than or equal to 25 degrees and less than or equal to 35 degrees between the second direction and the first direction is a suitable angle selection range.

[0064] The buckle 1300 extends along the second direction, that is, the length direction of the buckle 1300 is the same as the second direction. The length of the buckle 1300 is proportional to the clamping force of the buckle 1300. The obliquely arranged buckle 1300 has a longer length and a stronger clamping force. When the angle between the second direction and the first direction is in the range of 25 degrees to 35 degrees, the buckle 1300 has a longer length and can provide a stronger clamping force.

[0065] In some embodiments, the maximum distance between the first end portion 1301 and the second end portion 1302 in the second direction is 6 mm - 12.5 mm, that is, the length of the buckle 1300 in the second direction is 6 mm - 12.5 mm, which can meet the required clamping force of the buckle 1300. Optionally, the maximum distance between the first end portion 1301 and the second end portion 1302 in the second direction is 8.5 mm, that is, the length of the buckle 1300 in the second direction is 8.5 mm, which can meet the required clamping force of the buckle 1300 and at the same time leave a proper space for the first front protrusion 1206 in the first direction.

[0066] Optionally, when the length of the buckle 1300 in the second direction is 8.5 mm and the included angle between the second direction and the first direction is 30 degrees, the buckle 1300 has a relatively strong clamping force and the effect of reducing the moving distance of the cushion prosthesis 1000 in the front-back direction under the action of force by the first front protrusion 1206 is also relatively good. As Figure 7 shown, in some embodiments, the included angle between the upper surface 2221 of the curved-edge enclosure 2220 and the horizontal plane is between 1° and 3°. The included angle of 1° - 3° is small, so the trailing edge of the curved-edge enclosure 2220 and the upper surface 2231 of the rear enclosure 2230 will not be too low, and there is sufficient structural strength when a groove is opened on the front surface of the rear enclosure 2230. At the same time, the gap between the upper surface 2221 of the curved-edge enclosure 2220 and the upper surface 2231 of the rear enclosure 2230 and the first surface 1110 is small, reducing the possibility of loosening in the cooperation between the cushion prosthesis 1000 and the tibial tray platform 2000 due to the existence of the gap. And the cooperation between the buckle 1300 and the front card slot 2302, the cooperation between the protrusion portion 1200 and the receiving groove 2201, and the cooperation between the card convex portion 1208 and the rear card slot 2303 all make it difficult for the cushion prosthesis 1000 and the tibial tray platform 2000 to loosen when they are engaged with each other, avoiding the problem of loosening in the cooperation between the cushion prosthesis 1000 and the tibial tray platform 2000 caused by the gap.

[0067] As Figure 4 shown, in some embodiments, the upper surface of the straight-edge enclosure 2240 includes a first plane 2241, a connecting inclined plane 2242, and a second plane 2243. The leading edge of the first plane 2241 is connected to the upper surface 2211 of the front enclosure 2210. The upper edge of the connecting inclined plane 2242 is connected to the trailing edge of the first plane 2241. The lower edge of the connecting inclined plane 2242 is connected to the leading edge of the second plane 2243. The trailing edge of the second plane 2243 is connected to the upper surface 2231 of the rear enclosure 2230.

[0068] The straight-edge enclosure 2240 fits the bone incision without bone cement adhesion, so there is no need to consider cleaning the bone cement. Therefore, the front edge of the first plane 2241 is connected to the upper surface 2211 of the front enclosure 2210, and the height of the first plane 2241 is the same as the height of the front enclosure 2210. To clean the bone cement on the upper surface 2231 of the rear enclosure 2230 and leave enough space, the rear edge of the second plane 2243 is connected to the upper surface 2231 of the rear enclosure 2230, and the height of the second plane 2243 is the same as the height of the rear enclosure 2230. The connecting inclined plane 2242 serves to connect the first plane 2241 and the second plane 2243.

[0069] The connecting inclined plane 2242 is located on the upper surface of the straight-edge enclosure 2240 near the rear enclosure 2230. The height of the upper surface of the first plane 2241 is the same as the height of the front enclosure 2210. Therefore, the straight-edge enclosure 2240 has sufficient blocking height to prevent the liner placed therein from moving.

[0070] As Figure 5 shown, in some embodiments, a bone cement groove 2110 is provided on the lower surface of the bottom plate 2100, and the tibial tray platform 2000 further includes a plurality of partition ribs 2120. The plurality of partition ribs 2120 are provided in the bone cement groove 2110 to divide the bone cement groove 2110 into a plurality of sub-bone cement grooves 2130.

[0071] The bone cement groove 2110 is fixed together with the bone cement below. The bone cement forms a plurality of protrusions connected thereto in the plurality of sub-bone cement grooves 2130 of the bone cement groove 2110, so that a locking is formed on the bone cement surface of the lower surface of the bottom plate 2100, increasing the solidification force between the bone cement and the tibial tray platform 2000 and playing a role in fixing the tibial tray platform 2000.

[0072] The present application also provides a tibial tray prosthesis. The tibial tray prosthesis according to the embodiment of the present invention includes a positioning ridge 2400 and the above-mentioned tibial tray platform 2000, and the positioning ridge 2400 is connected to the tibial tray platform 2000.

[0073] As Figure 5 shown, in some embodiments, the positioning ridge 2400 is located below the tibial tray platform 2000. The positioning ridge 2400 is perpendicular to the tibial tray platform 2000, and the positioning ridge 2400 and the tibial tray platform 2000 are integrally formed. The positioning ridge 2400 plays a positioning role, enabling the tibial tray platform 2000 to be in the correct position during installation.

[0074] Next, refer to Figures 1 to 8 to describe the liner prosthesis 1000 according to the embodiment of the present invention. The liner prosthesis 1000 includes a body 1100, a protrusion portion 1200, and a buckle 1300.

[0075] The body 1100 has a first surface 1110, which is a plane. The first surface 1110 includes a front edge 1101, a curved edge 1102, a rear edge 1103, and a straight edge 1104 connected in sequence. The front edge 1101 and the rear edge 1103 are opposite in the front-rear direction. The curved edge 1102 and the straight edge 1104 are opposite in the first direction. The distance between the front edge 1101 and the straight edge 1104 in the first direction first increases and then decreases along the direction from the rear to the front. The first direction is perpendicular to the front-rear direction.

[0076] The protrusion 1200 is provided on the first surface 1110 of the body 1100. The buckle 1300 is provided on the first surface 1110 of the body 1100. The buckle 1300 extends along a second direction, and the included angle between the second direction and the first direction is an acute angle. The buckle 1300 has a first end 1301 and a second end 1302 opposite to each other in the second direction. The first end 1301 is adjacent to the straight edge 1104 relative to the second end 1302 in the first direction. The first end 1301 is adjacent to the foremost end of the front edge 1101 relative to the second end 1302 in the front-rear direction. The maximum distance between the second end 1302 and the front edge 1101 in the front-rear direction is a first distance, and the maximum distance between the rear edge 1103 and the front edge 1101 in the front-rear direction is a second distance. The ratio of the first distance to the second distance is 1:(3 - 4).

[0077] The front-rear direction is the same as the front-rear direction of the human knee joint. The first direction is the same as the inner-outer direction of the human knee joint. The first direction is as shown by the arrow A in Figure 3 , the front-rear direction is as shown by the arrow B in Figure 3 , the up-down direction is as shown by the arrow C in Figure 7 , and the second direction is as shown by the arrow D in Figure 3 .

[0078] In a unicompartmental knee replacement surgery, the cushion prosthesis 1000 is installed on the tibial tray platform 2000. The protrusion 1200 cooperates with the receiving groove 2201 of the tibial tray platform 2000. The upper surface of the flange 2200 is opposite to the first surface 1110. Since the ratio of the first distance to the second distance is 1:(3 - 4), the buckle 1300 is provided on the first part of the first surface 1110 adjacent to the front edge 1101. Since the distance between the curved edge 1102 and the straight edge 1104 in the first direction first increases and then decreases along the direction from the rear to the front, the size of the first part of the first surface 1110 in the first direction is smaller.

[0079] Therefore, the cushion prosthesis 1000 according to the embodiment of the present invention has the advantages of strong clamping force, not easily causing deformation, and not easily falling off from the tibial tray platform 2000.

[0080] As shown in Figures 1 to 8As shown, the present application also provides an artificial knee joint prosthesis. The tibial tray prosthesis according to an embodiment of the present invention includes a tibial tray platform 2000 and the above-mentioned cushion prosthesis 1000.

[0081] The tibial tray platform 2000 includes a bottom plate 2100 and a flange 2200.

[0082] The upper surface of the bottom plate 2100 is a flat surface. The flange 2200 is provided on the upper surface of the bottom plate 2100, and the flange 2200 is integrally formed with the bottom plate 2100.

[0083] The flange 2200 includes a front enclosure 2210, a curved-side enclosure 2220, a rear enclosure 2230, and a straight-side enclosure 2240 that are connected in sequence. At least a part of the upper surface 2211 of the front enclosure 2210 and the upper surface of the straight-side enclosure 2240 are located on the same horizontal plane. The upper surface 2231 of the rear enclosure 2230 is located below the upper surface 2211 of the front enclosure 2210. The upper surface 2221 of the curved-side enclosure 2220 is an inclined plane. The front edge of the curved-side enclosure 2220 is connected to the upper surface 2211 of the front enclosure 2210. The rear edge of the curved-side enclosure 2220 is connected to the upper surface 2231 of the rear enclosure 2230. The front edge of the curved-side enclosure 2220 is located above the rear edge of the curved-side enclosure 2220.

[0084] The height of the rear enclosure 2230 is lower than that of the front enclosure 2210. The upper surface 2221 of the curved-side enclosure 2220 is an inclined flat surface connecting the upper surface 2211 of the front enclosure 2210 and the upper surface 2231 of the rear enclosure 2230. The curved-side enclosure 2220 is an enclosure with a smoothly decreasing height from the front end to the rear end. After the tibial tray platform 2000 is installed, the upper surface at the rear end of the tibial tray platform 2000 is lower, so that the space at the rear side after the operation is increased, and the space for cleaning the bone cement at the rear side after the operation is increased.

[0085] The front enclosure 2210, the curved-side enclosure 2220, the rear enclosure 2230, and the straight-side enclosure 2240 that are connected in sequence and the bottom plate define a receiving groove 2201.

[0086] The cushion prosthesis 1000 and the tibial tray platform 2000 can cooperate with each other. The convex portion 1200 can be fitted into the receiving groove 2201. The shape of the receiving groove 2201 is adapted to the shape of the convex portion 1200 so that 2201 can be more stably fitted into 1200. The buckle 1300 can be engaged in the front card slot 2302.

[0087] As Figure 3 shown, the peripheral surface of the convex portion 1200 includes a front surface 1201, a curved-side surface 1202, a rear surface 1203, and a straight-side surface 1204 that are connected in sequence. Among them, the straight-side surface 1204 constitutes a first guiding surface 1400, and a part of the curved-side surface 1202 is parallel to the straight-side surface 1204 to constitute a second guiding surface 1401.

[0088] As shown Figure 8 in the figure, the inner side surface of the straight-edge enclosure 2240 constitutes a third guiding surface 2304. The inner side surface of the straight-edge enclosure 2240 refers to the side surface of the straight-edge enclosure 2240 adjacent to the receiving groove 2201, that is, the inner side surface of the straight-edge enclosure 2240 is a part of the peripheral wall surface of the receiving groove 2201. The third guiding surface 2304 can cooperate with the first guiding surface 1400 of the cushion prosthesis 1000. A part of the inner side surface of the curved-edge enclosure 2220 is parallel to the inner side surface of the straight-edge enclosure 2240 so as to constitute a fourth guiding surface 2305. The inner side surface of the curved-edge enclosure 2220 refers to the side surface of the curved-edge enclosure 2220 adjacent to the receiving groove 2201, that is, the inner side surface of the curved-edge enclosure 2220 is a part of the peripheral wall surface of the receiving groove 2201. The fourth guiding surface 2305 can cooperate with the second guiding surface of the cushion prosthesis 1000.

[0089] During the process of installing the cushion prosthesis 1000 onto the tibial tray platform 2000, by moving (sliding) the first guiding surface 1400 closely against the third guiding surface 2304 and moving (sliding) the second guiding surface closely against the fourth guiding surface 2305, the cushion prosthesis 1000 is guided, facilitating the installation of the cushion prosthesis 1000 into the tibial tray platform 2000.

[0090] As shown Figure 2 in the figure, a clamping convex portion 1208 is provided on the rear surface 1203 of the convex portion 1200 of the cushion prosthesis 1000, and the clamping convex portion 1208 is away from the first surface 1110. That is to say, the clamping convex portion 1208 is provided on the part of the rear surface 1203 away from the first surface 1110. A rear clamping groove 2303 is provided on the front surface of the rear enclosure 2230 of the tibial tray platform 2000, and the clamping convex portion 1208 can be clamped onto the rear clamping groove 2303.

[0091] The clamping convex portion 1208 is away from the first surface 1110. Therefore, the rear clamping groove 2303 is provided at a position of the rear enclosure 2230 close to the bottom plate 2100, so that the position of the rear clamping groove 2303 is adapted to the position of the clamping convex portion 1208. The position of the rear clamping groove 2303 being close to the bottom plate 2100 provided makes the rear enclosure 2230 have higher structural strength and be more stable when receiving the cushion prosthesis 1000.

[0092] As shown Figure 1As shown, a first groove 2300 and a gripping groove 2301 are provided on the front surface of the tibial tray platform 2000. The first groove 2300 is located above the gripping groove 2301. A second groove 1402 is provided on the front surface of the body 1100. The upper end of the first groove 2300 is open, and the lower end of the second groove 1402 is open. The first groove 2300 and the second groove 1402 are oppositely arranged in the vertical direction to form a removal groove. Optionally, the gripping groove 2301 is provided in the middle of the front surface of the tibial tray platform 2000, and the first groove 2300 is provided in the upper part of the front surface of the tibial tray platform 2000.

[0093] When performing a unicompartmental surgery, the gripper fixes the tibial tray platform 2000 by inserting and gripping the gripping groove 2301, and then moves the tibial tray platform 2000 to a proper position. When it is found that the already engaged liner prosthesis 1000 and the tibial tray platform 2000 need to be separated, a separator is inserted into the removal groove to separate the already engaged liner prosthesis 1000 and the tibial tray platform 2000. After removing the liner prosthesis 1000 that needs to be replaced, a more suitable liner prosthesis 1000 is selected for reinstallation. By providing the removal groove, it is more convenient to remove the liner prosthesis 1000 that needs to be replaced.

[0094] As Figure 3 shown, the protrusion 1200 and the buckle 1300 are arranged at intervals. An avoidance groove 1205 is defined between the protrusion 1200 and the buckle 1300. The avoidance groove 1205 extends along the second direction. The maximum distance between the avoidance groove 1205 and the front edge 1101 in the front-rear direction is less than or equal to the first distance.

[0095] The avoidance groove 1205 is provided between the protrusion 1200 and the buckle 1300, providing an elastic deformation space for the buckle 1300, so that the buckle 1300 can have a greater deformation degree when engaging into the front card slot 2302, facilitating the buckle 1300 to smoothly enter the front card slot 2302. The avoidance groove 1205 provides the necessary operating space for the tool to process the buckle 1300, thereby reducing the processing difficulty of the buckle 1300.

[0096] As Figure 3As shown, the circumferential surface of the convex portion 1200 includes a front surface 1201, a curved side surface 1202, a rear surface 1203, and a straight side surface 1204 that are sequentially connected. The front surface 1201 includes a first front convexity 1206, and the first front convexity 1206 is located between the straight side surface 1204 and the groove surface of the avoidance groove 1205. A part of the first front convexity 1206 is located on the front side of the buckle 1300. Specifically, the distance from the frontmost end of the first front convexity 1206 to the frontmost end of the front edge 1101 is less than the distance from the frontmost end of the buckle 1300 to the frontmost end of the front edge 1101. The front surface 1201 further includes a second front convexity 1207, and the second front convexity 1207 is located between the curved side surface 1202 and the groove surface of the avoidance groove 1205.

[0097] As Figure 8 shown, a first front convex groove 2306 is provided on the rear surface of the front enclosure 2210, and the first front convex groove 2306 cooperates with the first front convexity 1206. When the cushion prosthesis 1000 is buckled on the tibial tray platform 2000, the cooperation between the first front convexity 1206 and the first front convex groove 2306 can reduce the moving distance of the cushion prosthesis 1000 in the front-rear direction under the action of force.

[0098] A second front convex groove 2307 that cooperates with the second front convexity 1207 is provided on the rear surface of the front enclosure 2210. When the cushion prosthesis 1000 is buckled on the tibial tray platform 2000, the cooperation between the second front convexity 1207 and the second front convex groove 2307 can reduce the moving distance of the cushion prosthesis 1000 in the front-rear direction under the action of force.

[0099] The cooperation between the first front convexity 1206 and the first front convex groove 2306, and the cooperation between the second front convexity 1207 and the second front convex groove 2307 make the relative displacement between the cushion prosthesis 1000 and the tibial tray platform 2000 in the front-rear direction smaller, have less impact on the human body, and ensure the normal operation of the prosthesis.

[0100] As Figure 3 shown, the included angle between the second direction and the first direction is 30 degrees. The buckle 1300 extends along the second direction, that is, the length direction of the buckle 1300 is the same as the second direction. The length of the buckle 1300 is proportional to the clamping force of the buckle 1300. The obliquely arranged buckle 1300 has a longer length and a stronger clamping force.

[0101] The maximum distance between the first end portion 1301 and the second end portion 1302 in the second direction is 8.5 mm, that is, the length of the buckle 1300 in the second direction is 8.5 mm, which can meet the required clamping force of the buckle 1300 and at the same time leave a proper space for the first front convexity 1206 in the first direction. While the buckle 1300 has a strong clamping force, the effect of the first front convexity 1206 reducing the moving distance of the cushion prosthesis 1000 in the front-rear direction under the action of force is also relatively good.

[0102] As Figure 7 shown, the included angle between the upper surface 2221 of the curved-edge retaining wall 2220 and the horizontal plane is 2°, and this included angle of 2° is relatively small. Therefore, the trailing edge of the curved-edge retaining wall 2220 and the upper surface 2231 of the rear retaining wall 2230 will not be too low, and there is sufficient structural strength when a groove is opened on the front surface of the rear retaining wall 2230. At the same time, the gap generated between the upper surface 2221 of the curved-edge retaining wall 2220 and the upper surface 2231 of the rear retaining wall 2230 and the first surface 1110 is relatively small, reducing the possibility that the cushion prosthesis 1000 and the tibial tray platform 2000 may become loose due to the existence of the gap. Moreover, the cooperation between the buckle 1300 and the front card slot 2302, the cooperation between the convex portion 1200 and the receiving groove 2201, and the cooperation between the convex portion 1208 and the rear card slot 2303 all make it difficult for the cushion prosthesis 1000 and the tibial tray platform 2000 to become loose when they are engaged with each other, avoiding the problem that the gap may cause the cushion prosthesis 1000 and the tibial tray platform 2000 to become loose in cooperation.

[0103] As Figure 4 shown, the upper surface of the straight-edge retaining wall 2240 includes a first plane 2241, a connecting inclined plane 2242, and a second plane 2243. The leading edge of the first plane 2241 is connected to the upper surface 2211 of the front retaining wall 2210, the upper edge of the connecting inclined plane 2242 is connected to the trailing edge of the first plane 2241, the lower edge of the connecting inclined plane 2242 is connected to the leading edge of the second plane 2243, and the trailing edge of the second plane 2243 is connected to the upper surface 2231 of the rear retaining wall 2230.

[0104] The straight-edge retaining wall 2240 fits the bone incision and there is no bone cement adhesion, so there is no need to consider cleaning the bone cement. Therefore, the leading edge of the first plane 2241 is connected to the upper surface 2211 of the front retaining wall 2210, and the height of the first plane 2241 is the same as the height of the front retaining wall 2210. In order to clean the bone cement on the upper surface 2231 of the rear retaining wall 2230 and leave enough space, the trailing edge of the second plane 2243 is connected to the upper surface 2231 of the rear retaining wall 2230, and the height of the second plane 2243 is the same as the height of the rear retaining wall 2230. The connecting inclined plane 2242 serves to connect the first plane 2241 and the second plane 2243.

[0105] The connecting inclined plane 2242 is located on the upper surface of the straight-edge retaining wall 2240 close to the rear retaining wall 2230. The height of the upper surface of the first plane 2241 is the same as the height of the front retaining wall 2210. Therefore, the straight-edge retaining wall 2240 has sufficient blocking height to block the movement of the cushion placed therein.

[0106] As Figure 5As shown, a bone cement groove 2110 is provided on the lower surface of the base plate 2100. The tibial tray platform 2000 further includes a plurality of partition ribs 2120. The partition ribs 2120 are arranged alternately along the first direction and the front-back direction. The plurality of partition ribs 2120 are arranged in the bone cement groove 2110 so as to divide the bone cement groove 2110 into a plurality of sub-bone cement grooves 2130.

[0107] The bone cement groove 2110 is fixed together with the bone cement below. The bone cement forms a plurality of protrusions connected thereto in the plurality of sub-bone cement grooves 2130 of the bone cement groove 2110, so that a locking is formed on the bone cement surface of the lower surface of the base plate 2100, increasing the setting force between the bone cement and the tibial tray platform 2000 and playing a role in fixing the tibial tray platform 2000.

[0108] The present application also provides a tibial tray prosthesis. The tibial tray prosthesis according to the embodiment of the present invention includes a positioning ridge 2400 and the above-mentioned tibial tray platform 2000. The positioning ridge 2400 is connected to the tibial tray platform 2000.

[0109] As Figure 5 shown, in some embodiments, the positioning ridge 2400 is located below the tibial tray platform 2000. The positioning ridge 2400 is perpendicular to the tibial tray platform 2000. The positioning ridge 2400 and the tibial tray platform 2000 are integrally formed. The positioning ridge 2400 plays a positioning role, enabling the tibial tray platform 2000 to be in the correct position during installation.

[0110] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0111] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0112] In the present invention, unless otherwise clearly specified or limited, terms such as "installed", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication between two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0113] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0114] In the present invention, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0115] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A cushion prosthesis, characterized in that, comprising: a body having a first surface, the first surface including a front edge, a curved edge, a rear edge, and a straight edge connected in sequence, the front edge and the rear edge being opposite in the front-rear direction, the curved edge and the straight edge being opposite in a first direction, the distance between the curved edge and the straight edge in the first direction increasing first and then decreasing along the direction from the rear to the front, the first direction being perpendicular to the front-rear direction; a protrusion provided on the first surface of the body; and a buckle provided on the first surface of the body, the buckle extending along a second direction, the angle between the second direction and the first direction being an acute angle, the buckle having a first end and a second end opposite in the second direction, the first end being adjacent to the straight edge relative to the second end in the first direction, the first end being adjacent to the foremost end of the front edge relative to the second end in the front-rear direction, the maximum distance between the second end and the front edge in the front-rear direction being a first distance, the maximum distance between the rear edge and the front edge in the front-rear direction being a second distance, the ratio of the first distance to the second distance being 1:(3 - 4); the angle between the second direction and the first direction being greater than or equal to 25 degrees and less than or equal to 35 degrees.

2. The cushion prosthesis according to claim 1, characterized in that, the angle between the second direction and the first direction is 30 degrees.

3. The cushion prosthesis according to claim 1, characterized in that, the maximum distance between the first end and the second end in the second direction is 6 mm - 12.5 mm.

4. The cushion prosthesis according to claim 1, characterized in that, the peripheral surface of the protrusion includes a front surface, a curved side surface, a rear surface, and a straight side surface connected in sequence, wherein the straight side surface constitutes a first guiding surface, and a part of the curved side surface is parallel to the straight side surface so as to constitute a second guiding surface.

5. The cushion prosthesis according to claim 4, characterized in that, a clamping protrusion is provided on the rear surface of the protrusion, the clamping protrusion being away from the first surface.

6. The cushion prosthesis according to claim 5, characterized in that, the protrusion and the buckle are arranged at intervals, and an avoidance groove is defined between the protrusion and the buckle, the avoidance groove extending along the second direction.

7. The cushion prosthesis according to claim 6, characterized in that, the peripheral surface of the protrusion includes a front surface, a curved side surface, a rear surface, and a straight side surface connected in sequence, a first front protrusion is included on the front surface, the first front protrusion is located between the straight side surface and the groove surface of the avoidance groove, and a part of the first front protrusion is located in front of the buckle.

8. For the cushion prosthesis according to claim 3, the maximum distance between the first end and the second end in the second direction is 8.5 mm.

9. An artificial knee joint prosthesis, characterized in that, comprising: Tibial tray platform, the tibial tray platform includes a bottom plate and a flange provided on the bottom plate, a receiving groove is defined between the bottom plate and the flange, the flange includes a front enclosure, a curved enclosure, a rear enclosure and a straight enclosure connected in sequence, a front card slot and a first front convex groove are provided on the rear surface of the front enclosure, and a rear card slot is provided on the front surface of the rear enclosure; and Insert prosthesis, the insert prosthesis is the insert prosthesis according to any one of claims 7, the convex portion of the insert prosthesis can be fitted in the receiving groove, the buckle of the insert prosthesis can be snapped in the front card slot, the card convex portion can be snapped in the rear card slot, a first front convex groove is provided on the rear surface of the front enclosure, and the first front protrusion of the insert prosthesis can be fitted in the first front convex groove.

10. The artificial knee joint prosthesis according to claim 9, characterized in that the inner side surface of the straight enclosure constitutes a third guiding surface, the third guiding surface can cooperate with the first guiding surface of the insert prosthesis, a part of the inner side surface of the curved enclosure is parallel to the inner side surface of the straight enclosure so as to constitute a fourth guiding surface, and the fourth guiding surface can cooperate with the second guiding surface of the insert prosthesis.

11. The artificial knee joint prosthesis according to claim 9, characterized in that a first groove and a gripping groove are provided on the front surface of the tibial tray platform, the first groove is located above the gripping groove, a second groove is provided on the front surface of the body, wherein the upper end of the first groove is open, the lower end of the second groove is open, and the first groove and the second groove are oppositely arranged in the up-down direction so as to form a removal groove.

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