Assembly structure of gasket and platform and prosthesis

Abstract

The invention discloses a gasket and platform assembling structure which comprises a platform and a gasket, and the gasket is installed on the platform. The platform is provided with a groove; a W-shaped enclosing wall is arranged on one side of the groove; the gasket is provided with a first boss, and the first boss is matched with the groove; the side edge of the first boss comprises a first side edge matched with the W-shaped enclosing wall; the first boss is embedded into the groove, and the W-shaped enclosing wall is attached to the first side edge. According to the assembling structure of the gasket and the platform, the W-shaped enclosing wall is arranged, so that the matching area of the gasket and the platform is increased, the constraint strength is improved, and the risks of micro motion between the gasket and the platform and gasket abrasion or falling off are reduced.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to an assembly structure of a gasket and a platform and a prosthesis. Background Art

[0002] The ankle joint is one of the most heavily loaded joints in the human body, bearing up to five times the body weight during movement. During walking, as the ankle flexion angle changes, the axial force exerted by the distal tibia on the ankle joint is partially converted into an anteroposterior shear force between the distal tibia and the talar head. This anteroposterior shear force increases with increasing flexion angle. In conventional ankle prosthesis replacement surgery, the tibial plateau and spacer of the ankle prosthesis are often fixed in a modular configuration, often referred to as a fixed or fixed platform. In a fixed platform, micro-motion between the tibial plateau and spacer can lead to increased wear between the polyethylene spacer and the tibial plateau, increasing the risk of periprosthetic bone dissolution (osteolysis) caused by wear particles and subsequent prosthetic loosening and failure, potentially necessitating revision surgery. Compared to other large joint prostheses, such as hip and knee prostheses, ankle prostheses are smaller in size and subject to greater loads, placing greater stress on the polyethylene spacer material. Under long-term load conditions, creep of the polyethylene is inevitable. A gasket prosthesis with poor fixation and large creep often causes excessive relative movement between the gasket and the tibial plateau, which not only leads to increased gasket wear, but also in severe cases, the locking function between the gasket and the tibial plateau may fail, resulting in failure of the connection between the gasket and the tibial plateau, and the gasket falls off, reducing the survival time of the joint prosthesis in the patient's body. In severe cases, the joint needs to be revised.

[0003] In traditional ankle prostheses, the assembly of the tibial plateau and the gasket is often achieved through snap fastening, such as Figure 1 As shown, the gasket is installed on the tibial plateau. In the left-right direction, the top surface of the gasket forms an inverted trapezoidal step, which is embedded in the inverted trapezoidal groove on the bottom surface of the tibial plateau. In the front-back direction, the top surface of the inverted trapezoidal step of the gasket further forms a step with a very small width in the middle part near the front side. The step is located in the groove at the corresponding position of the tibial plateau, forming a K-type buckle structure. The K-type buckle structure limits the front-back displacement between the gasket and the tibial plateau. However, the contact area of ​​the restraining position of the two buckles is small. During the use of the patient, due to the excessive shear force, the stress on the restraining surface is too large, resulting in plastic deformation and large creep, and mutual movement between the gasket and the tibial plateau, resulting in wear of the gasket and failure of the locking device. Therefore, a new assembly method between the gasket and the tibial plateau is urgently needed to reduce the risk of wear and falling off caused by the mutual movement between the gasket and the tibial plateau.

[0004] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a gasket and platform assembly structure and prosthesis to solve the problem that the constraint strength between the gasket and the platform is not high, which easily causes mutual movement and leads to wear and failure.

[0006] In order to achieve the above objectives, the present invention provides an assembly structure of a gasket and a platform, including a platform and a gasket, wherein the gasket is installed on the platform; the platform is provided with a groove; a W-shaped wall is provided on one side of the groove; the gasket is provided with a first boss, and the first boss matches the groove; the side of the first boss includes a first side matching the W-shaped wall; the first boss is embedded in the groove, and the W-shaped wall fits with the first side.

[0007] Optionally, the W-shaped wall is a rear wall of the groove, and the first side is a rear side of the first boss.

[0008] Optionally, the cross-section of the W-shaped fence has a "W" shape or multiple continuously connected "W" shapes; when the cross-section has a "W" shape, the W-shaped fence includes two recessed portions and a convex portion therebetween; the end of a convex portion is close to the front side of the platform, and the ends of the two recessed portions are away from the front side of the platform; or, the W-shaped fence includes two convex portions and a recessed portion therebetween; the ends of the two convex portions are close to the front side of the platform, and the end of a recessed portion is away from the front side of the platform; when the cross-section has multiple continuously connected "W" shapes, the W-shaped fence includes multiple continuously arranged recessed portions and convex portions; the end of each convex portion is close to the front side of the platform, and the end of each recessed portion is away from the front side of the platform.

[0009] Optionally, the contact surface between the W-shaped fence and the first side is set to a first slope, and the first slope is inclined toward the front side at one end close to the end face of the W-shaped fence; the contact surface between the first side and the W-shaped fence is set to a second slope, and the inclination of the second slope matches the inclination of the first slope.

[0010] Optionally, the gasket is interference fit with the front and rear of the platform; the platform includes a platform end face and a circle of flanges arranged on the platform end face, and the platform end face and the flange together form the groove; the gasket also includes a base connected to the first boss, and the base has a circle of end faces surrounding the first boss, and the end face of the W-shaped wall is in contact with the rear side of the end face of the base; the end face of the first boss is in contact with the end face of the platform.

[0011] Optionally, the flange also includes a front wall, which is opposite to the W-shaped wall; the height of the front wall is lower than the height of the other walls of the flange, and a notch is formed at the front wall; a second boss is also provided on the base of the gasket, and the second boss is located in front of the first boss and matches the notch; the second boss is embedded in the notch; when the gasket is installed to the platform, the end face of the front wall contacts the end face of the second boss; the end face of the second boss forms a first step with the end face of the first boss.

[0012] Optionally, the flange further includes a front wall, which is opposite to the W-shaped wall; the end face of the front wall contacts the front side of the end face of the base, and the end face of the base and the end face of the first boss form a first step.

[0013] Optionally, the height of the first step is recorded as K size, the straight-line distance of the platform end face along the front-to-back direction is L size, and the maximum projection length of the W-shaped wall in the front-to-back direction is S size; the range of the K size is 0.5mm~5mm, the range of the S size is 1mm~50mm, the range of the L size is 1mm~50mm, the range of the width of the front wall is 10mm~40mm, and the range of the width of the W-shaped wall is 10mm~40mm.

[0014] The present invention also provides a prosthesis assembly comprising the assembly structure of the gasket and the platform, the prosthesis assembly comprising a first prosthesis, a first gasket and a second prosthesis, the first prosthesis being provided with the platform in the assembly structure, the first gasket corresponding to the gasket in the assembly structure, the first gasket being mounted on the platform of the first prosthesis, and the second prosthesis being in sliding contact with a side of the first gasket facing away from the first prosthesis.

[0015] Optionally, the prosthetic assembly is an ankle prosthesis, including a tibial plateau, a tibial gasket and a talar component, corresponding to the first prosthesis, the first gasket and the second prosthesis respectively; or the prosthetic assembly is a shoulder prosthesis, including a glenoid platform, a gasket and a glenoid component, corresponding to the first prosthesis, the first gasket and the second prosthesis respectively.

[0016] Compared with the prior art, the assembly structure and prosthesis of a gasket and a platform provided by the present invention perform three-dimensional constraints by means of a "W"-shaped slope plus a three-sided wall, which greatly increases the matching area between the gasket and the platform, improves the constraint strength, and thereby reduces the generation of micro-motion and the risk of gasket wear or falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of three-sided orthographic projection views of an assembly structure of a gasket and a platform in the prior art;

[0018] Figure 2 Schematic diagram of three-sided orthographic projection views of the assembly structure of the gasket and the platform of the present invention;

[0019] Figure 3 Schematic diagram of three-sided orthographic projection views of the assembly structure of the gasket and the platform provided with the second platform of the present invention;

[0020] Figure 4 is a schematic diagram of an ankle joint prosthesis of the present invention;

[0021] Figure 5 is a schematic diagram of the platform of the present invention;

[0022] Figure 6 is a schematic diagram of a gasket of the present invention;

[0023] Figure 7 A partial enlarged view of the W-shaped wall of the platform of the present invention;

[0024] Figure 8 This is a partially enlarged view of the first side of the gasket of the present invention. DETAILED DESCRIPTION

[0025] The following is a further detailed description of the assembly structure of the gasket and platform and the prosthesis proposed in the present invention in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the drawings are in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the drawings. It should be noted that the structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present invention, so they have no technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0026] The present invention provides a gasket and platform assembly structure, the gasket and platform assembly structure includes a platform 1 and a gasket 2, the gasket 2 is installed on the platform 1, Figure 2 and Figure 3 Schematic diagrams of two embodiments of the assembly structure. Figures 4 to 8 It is a schematic diagram of an embodiment of the assembly structure used for an ankle prosthesis, wherein the ankle prosthesis includes a tibial plateau and a tibial pad connected to the tibial plateau, wherein the tibial plateau and the tibial pad correspond to the platform 1 and the pad 2 respectively using the assembly structure.

[0027] like Figure 5As shown, the platform 1 includes a platform end surface 12 and a flange 11 disposed on the platform end surface 12. The flange 11 is disposed on the side of the platform 1 connected to the gasket 2, and the platform end surface 12 and the flange 11 together form a groove. The flange 11 includes a W-shaped enclosure 111, a first side enclosure 112, a front enclosure 114, and a second side enclosure 113, which are connected in sequence. The W-shaped enclosure 111 corresponds to the rear side, the front enclosure 114 corresponds to the front side, the first side enclosure 112 corresponds to the left side, and the second side enclosure 113 corresponds to the right side. The flanges 11 each have a certain thickness.

[0028] The cross section of the W-shaped enclosure 111 is W-shaped. Specifically, the cross section of the W-shaped enclosure 111 has one W-shape or multiple continuously connected W-shapes. When the cross section has a W-shape, the W-shaped enclosure 111 includes two concave portions and a convex portion therebetween. The convex portion is convex relative to the front enclosure 114, i.e., the end of one convex portion is close to the front enclosure 114, and the concave portion is concave relative to the front enclosure 114, i.e., the ends of the two concave portions are away from the front enclosure 114. Alternatively, the W-shaped enclosure 111 includes two convex portions and a concave portion therebetween (not shown in the figure), the ends of the two convex portions are close to the front enclosure 114, and the end of the one concave portion is away from the front enclosure 114. When the cross-section has multiple continuously connected "W" shapes, the W-shaped wall 111 includes multiple continuously arranged concave and convex parts (not shown in the figure), thereby forming a wavy or sawtooth shape, and the end of each convex part is close to the front wall 114, and the end of each concave part is away from the front wall 114.

[0029] like Figure 6As shown, the gasket 2 includes a base 21 and a first boss 22 connected thereto. The base 21 has a circle surrounding the upper surface of the first boss 22. In this embodiment, the end surface of the base 21 is defined as the upper surface of the base 21, and the end surface of the first boss 22 is defined as the upper surface of the first boss 22. The side edges of the first boss 22 include a first side 221, a second side 222, a fourth side 224, and a third side 223, which are connected in sequence. The position, shape, and size of the first side 221 match those of the W-shaped enclosure 111; the position, shape, and size of the second side 222 match those of the first side enclosure 112; the position, shape, and size of the third side 223 match those of the second side enclosure 113; and the position, shape, and size of the fourth side 224 match those of the front enclosure 114. Therefore, the first boss 22 matches the groove formed by the platform end surface 12 and the flange 11 of the platform 1. During assembly, the first boss 22 is embedded in the groove, the first side 221 is in contact with the W-shaped wall 111, the second side 222 is in contact with the first side wall 112, the third side 223 is in contact with the second side wall 23, and the fourth side 224 is in contact with the front wall 114. The upper surface of the first boss 22 is in contact with the platform end face 12, and the end faces of the W-shaped wall 111, the first side wall 112 and the second side wall 113 are in contact with the rear side, left side and right side of the upper surface of the base 21 respectively, thereby forming a tight assembly structure between the gasket 2 and the platform 1.

[0030] When the ankle joint prosthesis is subjected to shear force in the front-to-back direction, the W-shaped wall 111 constrains the first side 221, and the front wall 114 constrains the fourth side 224, thereby preventing the gasket 2 from moving forward and backward; when the ankle joint prosthesis is subjected to shear force in the left-to-right direction, the first side wall 112 constrains the second side 222, and the third side wall 13 constrains the third side 223, thereby preventing the gasket 2 from moving left and right. At the same time, the W-shaped wall 111 and the first side 221 are designed in a "W" shape, which also has the function of limiting the left-right relative movement of the gasket and the platform. Since the "W"-shaped design of the W-shaped wall 111 greatly expands the contact area between the W-shaped wall 111 and the first side 221, and the width of the front wall 114, that is, the distance between the first side wall 112 and the second side wall 113 on the front side, is also wider than the traditional snap-on structure, compared with the traditional assembly structure, the assembly structure of the present invention has a larger front and rear constraint area. When the ankle joint prosthesis is subjected to shear force in the front and rear directions, the stress is smaller, which can ensure that the ankle joint prosthesis is stabilized by the front and rear constraints.

[0031] Furthermore, an interference fit is adopted between the gasket 2 and the platform 1. After assembly, a strong connection is formed due to the elastic deformation of the gasket 2. The restraining force of the assembly structure in the front-to-back direction and the left-to-right direction is further improved.

[0032] Further, if Figure 7 As shown, the contact surface between the W-shaped wall 111 and the first side 221 is set as a first inclined surface 1111, and the first inclined surface 111 is inclined toward the front wall 114 at one end close to the end surface of the W-shaped wall 111; the inclination α of the first inclined surface 1111 is recorded as the angle between the inclined surface 1111 and the normal direction of the platform end surface 12, and the range of the inclination α is 0<α<90°, and in this preferred embodiment is set to 45°. Correspondingly, as Figure 8 As shown, the contact surface between the first side 221 and the W-shaped wall 111 is configured as a second inclined surface 2211. The inclination of the second inclined surface 2211 matches the inclination of the first inclined surface 1111, that is, the angle between the second inclined surface 2211 and the normal direction of the upper surface of the base 21 is also α. The two contact surfaces between the W-shaped wall 111 and the first side 221 can also be configured as two matching curved surfaces, for example, one contact surface is convex and the other contact surface is a matching concave surface.

[0033] Since the gasket 2 and the platform 1 are fitted with an interference fit, pressure exists between the gasket 2 and the platform 1 after assembly. Since the contact surface between the W-shaped wall 111 and the first side 221 has an inclination, this pressure will generate two components of force in the up and down directions and the front and back directions. The up and down components of force exert a restraining effect on the gasket 2 and the platform 1 in the up and down directions, preventing the gasket 2 and the platform 1 from separating up and down; the front and back components of force cause the platform 1 to exert a restraining effect on the gasket 2 in the front and back directions. The W-shaped wall 111 restrains the first side 221, and the front wall 114 restrains the fourth side 224, thereby fixing the gasket 2 and the platform 1 front and back.

[0034] Further, if Figure 5 As shown, the height of the front wall 114 is lower than that of the W-shaped wall 111, the first side wall 112 and the second side wall 113, thus forming a gap at the front wall 114; in this embodiment, the heights of the W-shaped wall 111, the first side wall 112 and the second side wall 113 are equal. Figure 6As shown, a second boss 23 is also provided on the base 21 of the gasket 2. The second boss 23 is located in front of the first boss 22 and corresponds to the position of the front wall 114 after mating. The upper surface of the second boss 23 matches the shape and size of the end face of the front wall 114, that is, the second boss 23 matches the notch. In this embodiment, the end face of the second boss 23 is defined as its upper surface. The upper surface of the second boss 23 is lower than the upper surface of the first boss 22, that is, the upper surface of the second boss forms a step with the upper surface of the first boss 22. Furthermore, the height of the second boss 23, that is, the distance from the upper surface of the second boss 23 to the upper surface of the base 21, and the difference between the height of the front wall 114 and the height of the W-shaped wall 111, the first side wall 112, and the second side wall 113 are equal. When the gasket 2 is fitted with the platform 1 , the second boss 23 is embedded in the notch, and the end surface of the front wall 114 contacts the upper surface of the second boss 23 .

[0035] By designing the height difference between the front wall 114 and the W-shaped wall 111, the first side wall 112, and the second side wall 113, both the restraining force requirement and the installation convenience requirement can be met. The W-shaped wall 111 is relatively high, ensuring the contact area between the W-shaped wall 111 and the first side edge 221, thereby ensuring the restraining force in the vertical and front-back directions. The front wall 114 is relatively low in height, avoiding the problem of excessive deformation of the gasket 2 during assembly caused by the excessive step height formed between the upper surface of the base 21 and the upper surface of the first boss 22, thereby facilitating installation.

[0036] By adjusting the height difference between the front wall 114 and the W-shaped wall 111, the first side wall 112, and the second side wall 113, and correspondingly adjusting the height of the second boss 23, the force required to install the gasket 2 into the platform 1 can be adjusted. The greater the height difference between the front wall 114 and the W-shaped wall 111, the first side wall 112, and the second side wall 113, that is, the greater the height of the second boss 23, and the smaller the distance between the upper surface of the second boss 23 and the upper surface of the first boss 22, the less deformation the gasket 2 will undergo when installed into the platform 1, and the less force is required.

[0037] The three-sided orthographic projection view of the gasket 2 and the platform 1 after forming an assembly structure without the second boss 23 is as follows: Figure 2As shown, the front wall 114 is in contact with the fourth side 224, and the end face of the front wall 114 contacts the front side of the upper surface of the base 21. As can be seen from the front view, the upper surface of the base 21 forms a step K with the upper surface of the first protrusion 22, and the height of the step K is denoted as K. On the upper surface of the first protrusion 22, the straight-line distance from the intersection of the end of the middle protruding portion of the "W"-shaped structure of the first side 221 and the upper surface of the first protrusion 22 to the intersection of the fourth side 224 and the upper surface of the first protrusion 22 along the front-to-back direction is L. L is also the straight-line distance of the platform end surface 12 between the W-shaped wall 111 and the front wall 114, that is, the straight-line distance of the platform end surface 12 along the front-to-back direction. The maximum projected length of the W-shaped wall 111 in the front-to-back direction is S.

[0038] The three-sided orthographic projection view of the gasket 2 and the platform 1 after the second boss 23 is formed into an assembly structure is as follows: Figure 3 As shown, the front wall 114 is in contact with the fourth side 224, and the end face of the front wall 114 is in contact with the upper surface of the second boss 23. As can be seen from the front view, the upper surface of the second boss 23 forms a step K with the upper surface of the first boss 22, and the height of the step K is denoted as K. On the upper surface of the first boss 22, the straight-line distance from the intersection of the end of the middle protruding portion of the "W"-shaped structure of the first side 221 and the upper surface of the first boss 22 to the intersection of the fourth side 224 and the upper surface of the first boss 22 in the front-to-back direction is L. L is also the straight-line distance of the platform end surface 12 between the W-shaped wall 111 and the front wall 114, that is, the straight-line distance of the platform end surface 12 in the front-to-back direction. The maximum projected length of the W-shaped wall 111 in the front-to-back direction is S.

[0039] The K, L, and S sizes are designed based on the actual size of the ankle prosthesis. Generally, the K size ranges from 0.5mm to 5mm, the S size ranges from 1mm to 50mm, and the L size ranges from 1mm to 50mm. The widths of the front wall 114 and the W-shaped wall 111 are also designed based on the actual size of the ankle prosthesis, generally ranging from 10mm to 40mm.

[0040] Since the "W"-shaped design of the W-shaped wall 111 greatly increases the contact area between the W-shaped wall 111 and the first side 221, the S size of the W-shaped wall 111 can be designed to be very small. Therefore, when the overall size of the ankle prosthesis remains unchanged, the L size of the gasket 2 can be designed to be very large, so that the gasket 2 has sufficient elastic deformation space. At the same time, the contact area between the first side wall 112 and the second side 222, and between the second side wall 113 and the third side 223 is increased, thereby increasing the constraint force of the platform 1 on the gasket 2 in the left and right directions.

[0041] Therefore, under the premise of ensuring that the gasket 2 is conveniently installed into the platform 1, this assembly structure can provide a larger constraint contact area in the front and back, left and right, and up and down directions by adjusting the S size, width, height, number of "W" and inclination of the first slope 1111 of the W-shaped wall 111, thereby increasing the constraint and limiting capacity between the platform and the gasket.

[0042] The present invention also provides an ankle prosthesis, such as Figure 4 As shown, the ankle joint prosthesis includes a platform 1, a spacer 2, and a talar component 3. The spacer 2 is mounted on the platform 1 and is in sliding contact with the talar component 3 on a side facing away from the platform 1. The platform 1 is provided with a plurality of fixing posts on a side facing away from the spacer 2 for connecting the platform 1 to the distal end of the tibia. The talar component 3 is also provided with a plurality of fixing posts on a side facing away from the spacer 2 for connecting the talar component 3 to the proximal end of the talus.

[0043] In addition, the assembly structure of the gasket and platform provided by the present invention is not limited to ankle joint prosthesis, but can also be used in other joint prostheses such as shoulder joint prosthesis, and the above-mentioned assembly structure is adopted for the platform and gasket of the joint prosthesis.

[0044] The present invention also provides a shoulder joint prosthesis (not shown in the figure), which includes a glenoid platform, a gasket and a glenoid component. The gasket is installed on the glenoid platform. The glenoid platform and the gasket adopt the assembly structure of the gasket and the platform provided by the present invention, that is, the glenoid platform adopts the platform 1 provided by the present invention, and the gasket adopts the gasket 2 provided by the present invention; the gasket is in sliding contact with the articular surface of the glenoid component on the side facing away from the glenoid platform.

[0045] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0046] In the description of the present invention, it should be understood that the terms "center," "height," "thickness," "up," "down," "vertical," "horizontal," "top," "bottom," "inside," "outside," "axial," "radial," "circumferential," and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0047] In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0048] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0049] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description is not intended to limit the present invention. After reading the above description, various modifications and substitutions of the present invention will become apparent to those skilled in the art. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A gasket and platform assembly structure, characterized in that: It comprises a platform (1) and a gasket (2), wherein the gasket (2) is mounted on the platform (1); The platform (1) is provided with a groove; a W-shaped wall (111) is provided on one side of the groove; The gasket (2) is provided with a first boss (22), and the first boss (22) matches the groove; the side of the first boss (22) includes a first side (221) matching the W-shaped wall (111); The first boss (22) is embedded in the groove, and the W-shaped wall (111) is in contact with the first side (221).

2. The assembly structure of the gasket and the platform according to claim 1, characterized in that: The W-shaped wall (111) is the rear wall of the groove, and the first side edge (221) is the rear side edge of the first boss (22).

3. The assembly structure of the gasket and the platform according to claim 2, characterized in that: The cross section of the W-shaped enclosure wall (111) has a single "W" shape or a plurality of continuously connected "W" shapes; When the cross section has a "W" shape, the W-shaped enclosure (111) includes two concave portions and a convex portion therebetween; the end of one convex portion is close to the front side of the platform (1), and the ends of the two concave portions are away from the front side of the platform (1); or, the W-shaped enclosure (111) includes two convex portions and a concave portion therebetween; the ends of the two convex portions are close to the front side of the platform (1), and the end of one concave portion is away from the front side of the platform (1); When the cross section has a plurality of continuously connected "W" shapes, the W-shaped enclosure (111) includes a plurality of continuously arranged concave and convex portions; the end of each convex portion is close to the front side of the platform (1), and the end of each concave portion is away from the front side of the platform (1).

4. The assembly structure of the gasket and the platform according to claim 2, characterized in that: The contact surface between the W-shaped enclosure wall (111) and the first side edge (221) is set as a first inclined surface (1111), and the first inclined surface (1111) is inclined toward the front side at one end close to the end surface of the W-shaped enclosure wall (111); The contact surface between the first side edge (221) and the W-shaped wall (111) is set as a second inclined surface (2211), and the inclination of the second inclined surface (2211) matches the inclination of the first inclined surface (1111).

5. The assembly structure of the gasket and the platform according to claim 2, characterized in that: The gasket (2) and the platform (1) are interference-fitted at the front and rear ends; The platform (1) comprises a platform end surface (12) and a circle of flanges (11) arranged on the platform end surface (12), wherein the platform end surface (12) and the flanges (11) together form the groove; The gasket (2) further comprises a base (21) connected to the first boss (22), the base (21) having an end face that surrounds the first boss (22), the end face of the W-shaped wall (111) being in contact with the rear side of the end face of the base (21); and the end face of the first boss (22) being in contact with the end face of the platform (12).

6. The assembly structure of the gasket and the platform according to claim 5, characterized in that: The flange (11) further includes a front wall (114) opposite to the W-shaped wall (111); the height of the front wall (114) is lower than the height of the other walls of the flange (11), and a gap is formed at the front wall (114); A second boss (23) is also provided on the base (21) of the gasket (2), and the second boss (23) is located in front of the first boss (22) and matches the notch; the second boss (23) is embedded in the notch; When the gasket (2) is mounted on the platform (1), the end surface of the front wall (114) contacts the end surface of the second boss (23); The end surface of the second boss (23) and the end surface of the first boss (22) form a first step.

7. The assembly structure of the gasket and the platform according to claim 5, characterized in that: The flange (11) further includes a front wall (114) opposite to the W-shaped wall (111); the end face of the front wall (114) contacts the front side of the end face of the base (21), and the end face of the base (21) and the end face of the first boss (22) form a first step.

8. The assembly structure of the gasket and the platform as described in claim 6 or 7, wherein the height of the first step is recorded as K dimension, the straight-line distance of the platform end surface (12) along the front-to-back direction is L dimension, and the maximum projection length of the W-shaped wall (111) in the front-to-back direction is S dimension; the range of the K dimension is 0.5mm to 5mm, the range of the S dimension is 1mm to 50mm, the range of the L dimension is 1mm to 50mm, the range of the width of the front wall (114) is 10mm to 40mm, and the range of the width of the W-shaped wall (111) is 10mm to 40mm.

9. A prosthetic component comprising the assembly structure of the spacer and the platform according to any one of claims 1 to 8, characterized in that: The invention comprises a first prosthesis, a first gasket and a second prosthesis, wherein the first prosthesis is provided with a platform (1) in the assembly structure, the first gasket corresponds to the gasket (2) in the assembly structure, the first gasket is mounted on the platform of the first prosthesis, and the second prosthesis is in sliding contact with a side of the first gasket facing away from the first prosthesis.

10. The prosthetic assembly according to claim 9, wherein The prosthetic assembly is an ankle prosthesis, comprising a tibial plateau, a tibial pad and a talar component (3), corresponding to the first prosthesis, the first pad and the second prosthesis respectively; Or the prosthesis assembly is a shoulder joint prosthesis, including a glenoid platform, a gasket and a glenoid component, corresponding to the first prosthesis, the first gasket and the second prosthesis respectively.

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