Joint prosthesis implant and processing method therefor

Abstract

The present application provides a joint prosthesis implant and a processing method therefor, wherein the joint prosthesis implant comprises: a ceramic substrate, the ceramic substrate comprising a friction surface and a connection surface; and a metal coating connected to the connection surface, an interface being formed between the metal coating and the connection surface. A first locking hook part extending into the interior of the metal coating is arranged on the connection surface of the ceramic substrate, and a second locking hook part extending into the interior of the ceramic substrate is arranged on the metal coating. The first locking hook part and the second locking hook part coordinate to form an interlocking structure. The technical solution of the present application efficiently solves the problem that the metal coating of the joint prosthesis implant in the related art is prone to disengagement.

Description

Articulating prosthesis implant and method of processing thereof

[0001] Related applications

[0002] This application claims priority to the Chinese Invention Patent Application with the application date of May 30, 2024, the application number of 202410692379.0, and the invention name of "Articulating prosthesis implant and method of processing thereof", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the field of prosthesis, in particular, to an articulating prosthesis implant and a method of processing thereof. BACKGROUND

[0004] The current total hip prosthesis is composed of acetabular cup, ball head, inner liner and femoral stem on the system components, which uses a relatively complex mechanical combination structure to reconstruct the physiological structure of the hip joint. This prosthesis system has high satisfaction in the current primary hip replacement. However, with the gradual progress of medical technology, the diagnosis and treatment of early hip joint lesions have been paid more and more attention, and now patients can often find hip joint lesions (such as arthritis or femoral head necrosis) through disease screening in the early stage. Especially some younger patients often have more activity needs. Therefore, the conventional simple reconstruction of the patient's hip joint function has been unable to meet the needs of such patients, and the resulting prosthesis loosening and dislocation and other clinical problems have greatly restricted the postoperative life quality of high-activity patients.

[0005] In related technologies, ceramic materials are excellent bio-inert materials, and their biological safety has been clinically verified for nearly 20 years. The excellent wear resistance of ceramic materials as the best wear-resistant material of the joint surface can make patients obtain more excellent physiological movement function of the hip joint. The above structure usually needs to use a metal transition piece or a bone cement filling layer between the ceramic prosthesis (such as ceramic acetabular cup and ceramic ball head) and the physiological bone interface to achieve the effect of fixing the ceramic prosthesis on the bone bed.

[0006] It is ideal to have a one-piece ceramic hip cup that has both an ideal articulating surface and a bioactive interface that allows for perfect osseointegration with the natural bone. This presents a great challenge to the manufacturing process. One alternative is to coat a layer of titanium or tantalum on the ceramic joint prosthesis at the interface with the natural bone using high-temperature plasma spraying technology. The bioactive properties of titanium, tantalum or other biocompatible metals are used to form osseointegration between the prosthesis and the natural bone after implantation into the human body. The articulating surface of the ceramic joint prosthesis can achieve an ideal smooth friction surface through high-temperature sintering and precision machining, but when titanium or tantalum metal powder or other biocompatible metal materials are sprayed onto the dense ceramic surface through high-temperature plasma spraying using the conventional surface spraying technology, the coating strength is extremely poor due to the difference in properties between the metal and the ceramic, and the coating can easily fall off.

[0007] Application content

[0008] The main purpose of the present application is to provide a joint prosthesis implant and a processing method thereof to solve the problem of easy peeling of the metal coating of the joint prosthesis implant in the related art.

[0009] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a joint prosthesis implant is provided, comprising: a ceramic base, the ceramic base comprising a friction surface and a connecting surface; a metal coating connected to the connecting surface, an interface being formed between the metal coating and the connecting surface; wherein the connecting surface of the ceramic base is provided with a first locking hook portion extending into the interior of the metal coating, and the metal coating is provided with a second locking hook portion extending into the interior of the ceramic base, the first locking hook portion and the second locking hook portion cooperating to form an interlocking structure.

[0010] Further, the first locking hook portion comprises a first hook body portion and a second hook body portion connected to each other, the first hook body portion being located between the ceramic base and the second hook body portion, a first included angle being formed between the first hook body portion and the interface, and a second included angle being formed between the second hook body portion and the interface, the second included angle being smaller than the first included angle.

[0011] Further, the end portion of the second locking hook portion is located inside the root portion of the first locking hook portion.

[0012] Further, a recess is formed in the surface of the metal coating away from the ceramic base corresponding to the position of the end portion of the first locking hook portion.

[0013] Further, the thickness of the ceramic base gradually decreases from the center to the periphery.

[0014] Further, the metal coating comprises a center region and a plurality of annular regions located outside the center region, and a thickness of the ceramic substrate corresponding to the same annular region varies less than or equal to 0.2 mm.

[0015] According to another aspect of the present application, a processing method of a joint prosthesis implant is provided for manufacturing the joint prosthesis implant described above, the processing method comprising: spraying on a connecting surface of the ceramic substrate to form a metal coating on the connecting surface; forming a first locking hook portion extending into an interior of the metal coating at the connecting surface of the ceramic substrate, and forming a second locking hook portion extending into an interior of the ceramic substrate on the metal coating, the first locking hook portion and the second locking hook portion cooperating to form an interlocking structure.

[0016] Further, the step of forming the first locking hook portion extending into the interior of the metal coating at the connecting surface of the ceramic substrate and forming the second locking hook portion extending into the interior of the ceramic substrate on the metal coating comprises: processing the metal coating and the ceramic substrate by a first laser to form a first protrusion and a second protrusion spaced apart and extending into the interior of the metal coating on the connecting surface, and to form a third protrusion extending into the interior of the ceramic substrate on the metal coating; processing the first protrusion by a second laser to form the first protrusion inclined towards the second protrusion, and to form a fourth protrusion on an outer surface of the metal coating, an incident direction of the second laser and an incident direction of the first laser form a preset angle; wherein the first protrusion arranged in an inclined manner forms the first locking hook portion, and the third protrusion forms the second locking hook portion.

[0017] Further, after the step of processing the first protrusion by the second laser, the processing method further comprises: processing the first protrusion arranged in an inclined manner by a third laser to move an end portion of the first protrusion towards the ceramic substrate.

[0018] Further, the incident direction of the first laser is a normal direction of the ceramic substrate; and / or the preset angle between the incident direction of the second laser and the incident direction of the first laser is greater than or equal to 20° and less than or equal to 45°.

[0019] Further, the energy of the first laser is greater than the energy of the second laser, and the area of the first laser is greater than the area of the second laser; and / or the area of the third laser is greater than the area of the second laser.

[0020] Further, the step of spraying on the connecting surface of the ceramic substrate to form the metal coating on the connecting surface comprises: spraying at a center of the connecting surface to obtain a center region; spraying outwardly from the center region in sequence to obtain a plurality of annular regions located outside the center region, and a thickness of the ceramic substrate corresponding to the same annular region varies less than or equal to 0.2 mm; wherein the center region and the plurality of annular regions form the metal coating.

[0021] Further, the step of spraying outwardly from the center region to obtain a plurality of annular regions located outside the center region comprises: the spraying time and / or interval time of the plurality of annular regions are shortened in turn.

[0022] The joint prosthesis implant includes a ceramic base and a metal coating layer. The ceramic base includes a friction surface and a connecting surface. The metal coating layer is connected to the connecting surface, and an interface is formed between the metal coating layer and the connecting surface. The connecting surface of the ceramic base is provided with a first locking hook portion extending into the interior of the metal coating layer. The metal coating layer is provided with a second locking hook portion extending into the interior of the ceramic base. The first locking hook portion and the second locking hook portion form an interlocking structure. The interlocking structure formed by the first locking hook portion and the second locking hook portion can effectively improve the bonding strength between the metal coating layer and the ceramic base, so that the metal coating layer and the ceramic base are not easy to separate. Therefore, the technical solution of the present application effectively solves the problem of easy peeling of the metal coating layer of the joint prosthesis implant in the related art. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings accompanying the specification of the present application form a part thereof and serve to provide further understanding of the present application, the illustrative embodiments of the present application and its description serve to explain the present application. The drawings do not constitute an inappropriate limitation on the present application. In the drawings:

[0024] Fig. 1 shows a cross-sectional schematic view of an embodiment of a joint prosthesis implant according to the present application;

[0025] Fig. 2 shows an enlarged schematic view of the joint prosthesis implant of Fig. 1;

[0026] Fig. 3 shows a perspective schematic view of a ceramic base of the joint prosthesis implant of Fig. 1;

[0027] Fig. 4 shows a cross-sectional schematic view of the ceramic base of Fig. 3;

[0028] Fig. 5 shows a structural schematic view of a metal coating layer of the joint prosthesis implant of Fig. 1;

[0029] Fig. 6 shows a flowchart of an embodiment of a processing method of a joint prosthesis implant according to the present application;

[0030] Fig. 7 shows a schematic view of spraying interval time of a plurality of annular regions in the processing method of Fig. 6;

[0031] Fig. 8 shows a schematic view of a laser path for processing the metal coating layer and the ceramic base by a first laser in the processing method of Fig. 6;

[0032] Fig. 9 shows a schematic view of another laser path for processing the metal coating layer and the ceramic base by a first laser in the processing method of Fig. 6;

[0033] Fig. 10 shows a schematic view of the first laser processing of the metal coating and the ceramic substrate in the processing method of Fig. 6;

[0034] Fig. 11 shows a schematic cross-sectional view of the structure of the metal coating and the ceramic substrate after the first laser processing;

[0035] Fig. 12 shows a schematic view of the second laser processing of the first protrusion in the processing method of Fig. 6;

[0036] Fig. 13 shows a schematic cross-sectional view of the structure of the metal coating and the ceramic substrate after the second laser processing;

[0037] Fig. 14 shows a schematic view of the third laser processing of the first protrusion arranged obliquely in another embodiment of the processing method of the joint prosthesis implant according to the present application;

[0038] Fig. 15 shows a schematic cross-sectional view of the structure of the metal coating and the ceramic substrate after the third laser processing; and

[0039] Fig. 16 shows a schematic view of a first included angle between the first hook body portion and the interface and a second included angle between the second hook body portion and the interface of the joint prosthesis implant of Fig. 1.

[0040] wherein the above figures comprise the following reference signs: 10, ceramic substrate; 11, friction surface; 111, recess; 12, connection surface; 13, first hook portion; 131, first hook body portion; 132, second hook body portion; 133, root portion; 20, metal coating; 21, second hook portion; 211, end portion; 22, central region; 23, annular region; 30, interface. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting of the application or its applications or uses. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present application.

[0042] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should be further understood that the terms "comprise" and / or "include" as used herein indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0043] The foregoing is considered as illustrative only of the principles of the application. Further, various modifications and changes can be made as to the implementation of the described embodiments by skilled those in the art without departing from the true spirit and scope of the application. Therefore, the scope of the application should be determined by the following claims, which include more than the disclosed embodiments.

[0044] As shown in FIG. 1, FIG. 2 and FIG. 13, the joint prosthesis implant of the embodiment comprises a ceramic base 10 and a metal coating layer 20, the ceramic base 10 comprises a friction surface 11 and a connecting surface 12, the metal coating layer 20 is connected to the connecting surface 12, and an interface 30 is formed between the metal coating layer 20 and the connecting surface 12. Wherein, the connecting surface 12 of the ceramic base 10 is provided with a first locking hook part 13 extending into the interior of the metal coating layer 20, the metal coating layer 20 is provided with a second locking hook part 21 extending into the interior of the ceramic base 10, and the first locking hook part 13 and the second locking hook part 21 form an interlocking structure.

[0045] By applying the technical solution of the embodiment, the interlocking structure formed by the cooperation of the first locking hook part 13 and the second locking hook part 21 can effectively improve the bonding strength between the metal coating layer 20 and the ceramic base 10, so that the metal coating layer 20 and the ceramic base 10 are not easy to separate. Therefore, the technical solution of the present application effectively solves the problem that the metal coating layer of the joint prosthesis implant is easy to fall off in the related art.

[0046] As a feasible implementation manner, the metal coating layer 20 can be a titanium coating layer or a tantalum coating layer.

[0047] As shown in FIG. 15 and FIG. 16, the first locking hook portion 13 comprises a first hook body portion 131 and a second hook body portion 132 connected with each other, the first hook body portion 131 is located between the ceramic substrate 10 and the second hook body portion 132, a first included angle a1 is formed between the first hook body portion 131 and the interface 30, a second included angle a2 is formed between the second hook body portion 132 and the interface 30, and the second included angle a2 is smaller than the first included angle a1. The above structure helps to further improve the bonding strength between the metal coating 20 and the ceramic substrate 10. As shown in FIG. 16, the first hook body portion 131 is an irregular protruding structure, and the first included angle a1 is substantially the included angle between the center line of the first hook body portion 131 and the interface 30. Similarly, the second hook body portion 132 is an irregular protruding structure, and the second included angle a2 is substantially the included angle between the center line of the second hook body portion 132 and the interface 30. The specific forming method of the first hook body portion 131 and the second hook body portion 132 will be described in detail in the processing method part.

[0048] As shown in FIG. 14, the end portion 211 of the second locking hook portion 21 is located inside the root portion 133 of the first locking hook portion 13. The above structure makes the end portion 211 of the second locking hook portion 21 be limited by the root portion 133 of the first locking hook portion 13, which helps to further improve the bonding strength between the metal coating 20 and the ceramic substrate 10. It should be noted that the "inside" mentioned above means that the end portion 211 of the second locking hook portion 21 is closer to the ball center (the ball center O is shown in FIG. 4) of the ceramic substrate 10 than the root portion 133 of the first locking hook portion 13.

[0049] As shown in FIG. 15, a recess 111 is formed at the position corresponding to the end portion of the first locking hook portion 13 on the surface of the metal coating 20 away from the ceramic substrate 10. The recess 111 structure can make the surface of the metal coating 20 away from the ceramic substrate 10 more flat, and improve the smoothness of the surface of the metal coating 20 away from the ceramic substrate 10.

[0050] As shown in FIG. 4 and FIG. 5, the thickness of the ceramic substrate 10 gradually decreases from the center to the periphery. The above structure can cooperate with the zoned processing method of the metal coating 20, and the ceramic substrate 10 is designed to be of variable thickness according to the thermal stress state, which facilitates the gradual release of thermal stress during the spraying process. In this way, the interface 30 between the metal coating 20 and the ceramic substrate 10 obtained by processing has a common thermal deformation rate, which helps to further improve the bonding strength between the metal coating 20 and the ceramic substrate 10.

[0051] As shown in FIG. 1, FIG. 2 and FIG. 5, the metal coating 20 comprises a central region 22 and a plurality of annular regions 23 outside the central region 22, and the thickness of the ceramic substrate 10 corresponding to the same annular region 23 varies less than or equal to 0.2 mm. In the process of the metal coating 20, the central region 22 is first sprayed at the center of the connecting surface 12, and then the plurality of annular regions 23 outside the central region 22 are sequentially sprayed from the central region 22. The central region 22 and the plurality of annular regions 23 form the metal coating 20. The metal coating 20 obtained by the above method has a common thermal deformation rate at the interface 30 between the metal coating 20 and the ceramic substrate 10, which helps to further improve the bonding strength between the metal coating 20 and the ceramic substrate 10.

[0052] In the above embodiment, the joint prosthesis implant is an acetabular cup. In other embodiments, the joint prosthesis implant can also be a prosthesis implant of other parts.

[0053] The application also provides a processing method of a joint prosthesis implant for manufacturing the joint prosthesis implant described above. As shown in FIG. 6 to FIG. 15, an embodiment of the processing method according to the application comprises:

[0054] Spraying on the connecting surface 12 of the ceramic substrate 10 to form the metal coating 20 on the connecting surface 12;

[0055] Forming the first locking hook part 13 extending into the interior of the metal coating 20 at the connecting surface 12 of the ceramic substrate 10, and forming the second locking hook part 21 extending into the interior of the ceramic substrate 10 on the metal coating 20, the first locking hook part 13 and the second locking hook part 21 cooperating to form an interlocking structure. The interlocking structure described above can also be referred to as a twist lock structure.

[0056] By applying the technical solution of the embodiment, the first locking hook part 13 and the second locking hook part 21 cooperating to form an interlocking structure can effectively improve the bonding strength between the metal coating 20 and the ceramic substrate 10, so that the metal coating 20 and the ceramic substrate 10 are not easy to separate. Therefore, the technical solution of the application effectively solves the problem of easy peeling of the metal coating of the joint prosthesis implant in the related art.

[0057] In the embodiment, the already sprayed region, i.e. the metal coating 20, is selectively regionally scanned by laser pulse cladding technology, the penetration depth and the laser energy are controlled, the metal coating 20 and the ceramic substrate 10 form a mutual twist lock structure, and the bonding force of the metal coating 20 is increased.

[0058] As shown in FIG. 10 to FIG. 13, the step of forming the first locking hook part 13 extending into the interior of the metal coating 20 at the connecting surface 12 of the ceramic substrate 10, and forming the second locking hook part 21 extending into the interior of the ceramic substrate 10 on the metal coating 20 comprises:

[0059] The metal coating 20 and the ceramic substrate 10 are processed by the first laser L1 to form the first protrusion M1 and the second protrusion M2 which are spaced apart and extend into the interior of the metal coating 20 on the connecting surface 12, and the third protrusion M3 which extends into the interior of the ceramic substrate 10 on the metal coating 20;

[0060] The first protrusion M1 is processed by the second laser L2 to be arranged obliquely towards the second protrusion M2, and the fourth protrusion M4 is formed on the outer surface of the metal coating 20, the incident direction of the second laser L2 and the incident direction of the first laser L1 form a preset angle a3; wherein the obliquely arranged first protrusion M1 forms the first hook portion 13, and the third protrusion M3 forms the second hook portion 21.

[0061] In the above method, the first protrusion M1 after being processed by the second laser L2 is arranged obliquely towards the second protrusion M2, which helps to further improve the bonding strength between the metal coating 20 and the ceramic substrate 10.

[0062] In order to further improve the locking effect of the interlocking structure formed by the first hook portion 13 and the second hook portion 21, after the step of processing the first protrusion by the second laser L2, the processing method further comprises: processing the obliquely arranged first protrusion M1 by the third laser L3 to move the end of the first protrusion M1 towards the ceramic substrate 10.

[0063] In the above method, the first protrusion M1 after being processed by the third laser L3 forms the first hook body portion 131 and the second hook body portion 132. Therefore, the second hook body portion 132 is inclined towards the ceramic substrate 10 relative to the first hook body portion 131, that is, the processing of the third laser L3 can further reduce the locking opening between the materials near the interface 30. This helps to further improve the bonding strength between the metal coating 20 and the ceramic substrate 10. In the above step, the third laser L3 processes the fourth protrusion M4 into the recess 111.

[0064] As a preferred embodiment, the incident direction of the first laser L1 is the normal direction of the ceramic substrate 10. The preset angle a3 between the incident direction of the second laser L2 and the incident direction of the first laser L1 is greater than or equal to 20° and less than or equal to 45°. The preset angle a3 between the incident direction of the second laser L2 and the incident direction of the first laser L1 can be 25°, 30°, 35°, 40° or 45°. Of course, the preset angle can also not be limited to the above angle range.

[0065] Preferably, the incident direction of the third laser L3 is parallel to the incident direction of the first laser L1, or the angle between them is smaller than the preset angle a3 between the incident direction of the second laser L2 and the incident direction of the first laser L1.

[0066] In the processing method of the embodiment, the energy of the first laser L1 is greater than the energy of the second laser L2, the area of the first laser L1 is greater than the area of the second laser L2; the area of the third laser L3 is greater than the area of the second laser L2. The greater the laser energy, the deeper the penetration depth, and the more significant the interface cable effect is achieved. The larger the laser area, the larger the molten pool area, and the effect of flattening the surface is achieved.

[0067] As shown in FIG. 7, the step of spraying on the connecting surface 12 of the ceramic base 10 to form the metal coating 20 on the connecting surface 12 includes: spraying at the center of the connecting surface 12 to obtain a center area 22; spraying outward from the center area 22 in sequence to obtain a plurality of annular areas 23 located outside the center area 22, the thickness of the ceramic base 10 corresponding to the same annular area 23 varies by no more than 0.2 mm; wherein the center area 22 and the plurality of annular areas 23 form the metal coating 20.

[0068] In the above step, the metal coating 20 of the ceramic base 10 is attached by using a zoned high-temperature spraying process on the ceramic base 10.

[0069] As shown in FIG. 7, the step of spraying outward from the center area 22 in sequence to obtain a plurality of annular areas 23 located outside the center area 22 includes: the spraying time and / or interval time of the plurality of annular areas 23 are shortened in sequence. The high-temperature spraying time is controlled to be shortened outward in sequence from the center area 22. The center area is sprayed for 2-2.5 seconds, and the spraying time is reduced outward in sequence by 0.2-0.3 seconds as a gradient. The interval time is controlled, and after the center area 22 is sprayed, the next area is sprayed after an interval of 2-4 seconds, and during the spraying process of the outer areas, the interval time is reduced in sequence by 0.3-0.5 seconds as a gradient. In this way, the internal temperature stress is controlled to be close to a uniform state.

[0070] The metal coating 20 obtained by the above method has a common thermal deformation rate at the interface 30 between the metal coating 20 and the ceramic base 10, which helps to further improve the bonding strength between the metal coating 20 and the ceramic base 10.

[0071] The innovation of the present application is that by applying a processing method, a ceramic base-based surface metal spraying coating can obtain a very high coating bonding strength, and the performance of the coating is more stable and reliable. Based on this processing method, a full-ceramic metal coating acetabular cup and a ceramic ball head can be realized, and of course other internal implants based on a ceramic base that need bone integration function can also be realized.

[0072] The preferred embodiments of the present application will be described in detail below with reference to FIGS. 1-16 of the drawings:

[0073] The embodiment is based on the ceramic base variable thickness acetabular cup design, adopts the partial spraying, laser pulse cladding lock process, and locally, partially or integrally clads and strengthens the coating to become the laser selective melting ceramic coating process. The specific implementation form is as follows.

[0074] The acetabular cup is a whole design and has a smooth inner surface and a variable thickness interface. The thickness change form is related to the spraying region sequence. In the past spraying process, the whole surface to be sprayed is usually sprayed on a rotating or fixed platform. The process usually does not need to consider the sequence and position relationship of spraying. For the metal coating sprayed on the metal substrate, the substrate and the coating have relatively close thermal expansion rates, and after cooling, the interlayer peeling phenomenon caused by different shrinkage rates does not occur. The thermal conductivity of ceramic material is slightly lower than that of metal, and the thermal deformation rate of ceramic material is smaller than that of metal. The thermal expansion coefficient of titanium metal is 8.6x10 -6 / ℃, the thermal expansion coefficient of tantalum metal is 6.6x10 -6 / ℃, and the thermal expansion coefficient of ceramic is 9.6x10 -6 / ℃. The thermal deformation of the substrate material is slightly higher than that of the metal coating material. Considering that the local temperature is increased by using high-temperature plasma spraying in the coating cladding process, the material thermal deformation should be fully considered to avoid the great internal stress of the substrate material caused by the rapid shrinkage of the coating material.

[0075] Therefore, in the embodiment, the variable thickness structure is designed, the material thermal transfer and the expansion rate change caused by the thickness change are matched with the selective spraying form, and the thermal deformation rates of the coating material and the substrate material are adjusted to be consistent. Further, in order to ensure the firm combination of the coating part and the substrate material, the laser pulse form is adopted to break the interface between the substrate and the coating in the semi-molten state of the coating, a layer lock structure is formed, and the coating bonding strength is greatly improved. In the application, the acetabular cup is taken as an example as follows:

[0076] The interface of the acetabular cup and the variable thickness thereof is shown in FIG. 1. Under the structure of the hemispherical acetabular cup, an easy-to-implement thickness change is a thickness change of thinning once along the polar top to the edge. The thickness change corresponds to the spraying partition and the spraying sequence.

[0077] According to the thickness change of the ceramic acetabular cup, the partition is divided along the circular ring from the center point of the polar top outer surface to the edge. Although the wall thickness of the acetabular cup continuously changes, the thickness change of the same partition is less than 0.2 mm. The thickness is calculated according to the normal of the spherical center O to the curved surface. As shown in FIG. 7.

[0078] After partitioning, the spraying process is carried out in sequence from the inner ring to the outer ring. The entire acetabular cup deforms from the high-temperature area at the bottom of the acetabulum, and the heat is transmitted from the pole to the surrounding area. The spray head is controlled to spray in sequence in the outer ring, and the spraying interval between the partitions is shortened in sequence. Finally, the interface material between the acetabular cup and the coating has a common thermal deformation rate, as shown in FIG. 7.

[0079] When the spraying operation is completed, a high-energy pulsed laser beam is used to scan the coating. The scanning path can be designed as a dot matrix, a grid, a spiral line, and other regular or irregular point, line, and surface combinations as needed. The laser output power is controlled to be slightly larger than the energy state of the metal coating depth, so that the scanned metal coating and the surface of the ceramic base below it form a small molten pool, and the metal coating and the ceramic surface structure of the base are re-mixed and integrated to form a twist lock structure. This structure can further integrate the overall coating and the base material, thereby improving the overall coating bonding force. If necessary, the coating surface can be fully scanned and integrated. FIGS. 8 and 9 show two laser path methods.

[0080] In the laser path and incident direction control process, a multi-laser beam deflection method is used to obtain a twist lock structure that penetrates the interface between the metal coating and the ceramic base. First, as shown in FIGS. 10 and 11, a high-energy laser, i.e., a first laser L1, generates a molten pool foundation. The energy transmission intensity is controlled to be slightly higher than the thickness of the metal coating, and the temperature of the coating and the base material within a certain range is raised to form a semi-molten state. Subsequently, as shown in FIGS. 12 and 13, the laser incident angle is adjusted by a certain deflection from the initial angle to obtain a second laser L2. The second laser L2 disrupts the sequence between the inner layers of the molten pool and plays a stirring role. The angled penetration causes the molten pool to deform, further reducing the locking opening between the materials near the interface. Finally, as shown in FIGS. 14 and 15, the laser angle is adjusted again to obtain a third laser L3, which increases the irradiation area. The third laser L3 uses optical pressure energy to compact the first locking hook 13, further forming a material twist lock structure between the interfaces, and simultaneously smoothing the asymmetric structure on the surface caused by the molten pool deformation in the previous step.

[0081] It should be noted that when a uniform distribution of burr structure is required on the outer surface, radial laser and variable incident angle laser can also be used alternately to reduce the step of optical pressure smoothing, thereby obtaining a very high burr protruding structure and an outer surface with very high roughness.

[0082] According to the above method, by controlling the thermal deformation in the ceramic spraying process and reinforcing with laser pulses after spraying, a ceramic substrate metal coating material with extremely high strength can be obtained. In the examples of the present application, laser is applied in dot matrix form or square scanning form, and other similar methods are within the technical scope of the present application, so that the coating structure in a certain area obtains the improvement of the bonding performance.

[0083] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A joint prosthesis implant, characterized in that, include: A ceramic substrate (10) includes a friction surface (11) and a connecting surface (12); A metal coating (20) is attached to the connecting surface (12), and an interface (30) is formed between the metal coating (20) and the connecting surface (12); The ceramic substrate (10) has a first locking hook portion (13) extending into the interior of the metal coating (20) at the connecting surface (12), and the metal coating (20) has a second locking hook portion (21) extending into the interior of the ceramic substrate (10). The first locking hook portion (13) and the second locking hook portion (21) cooperate to form an interlocking structure.

2. The joint prosthesis implant according to claim 1, characterized in that, The first hook portion (13) includes a first hook body portion (131) and a second hook body portion (132) connected to each other. The first hook body portion (131) is located between the ceramic substrate (10) and the second hook body portion (132). The first hook body portion (131) forms a first included angle (α1) with the interface (30), and the second hook body portion (132) forms a second included angle (α2) with the interface (30). The second included angle (α2) is smaller than the first included angle (α1).

3. The joint prosthesis implant according to claim 1, characterized in that, The end (211) of the second locking hook (21) is located inside the root (133) of the first locking hook (13).

4. The joint prosthesis implant according to claim 1, characterized in that, The surface of the metal coating (20) away from the ceramic substrate (10) forms a recess (111) at a position corresponding to the end of the first hook portion (13).

5. The joint prosthesis implant according to claim 1, characterized in that, The thickness of the ceramic substrate (10) gradually decreases from its center to its periphery.

6. The joint prosthesis implant according to claim 1, characterized in that, The metal coating (20) includes a central region (22) and a plurality of annular regions (23) located outside the central region (22), wherein the thickness variation of the ceramic substrate (10) corresponding to the same annular region (23) is less than or equal to 0.2 mm.

7. A method for processing a joint prosthesis implant, characterized in that, The processing method for manufacturing the joint prosthesis implant according to any one of claims 1 to 6 includes: Spraying is performed on the connecting surface (12) of the ceramic substrate (10) to form a metal coating (20) on the connecting surface (12); A first hook portion (13) extending into the interior of the metal coating (20) is formed at the connecting surface (12) of the ceramic substrate (10), and a second hook portion (21) extending into the interior of the ceramic substrate (10) is formed on the metal coating (20), the first hook portion (13) and the second hook portion (21) being connected together. They work together to form an interlocking structure.

8. The processing method according to claim 7, characterized in that, The steps of forming a first hook portion (13) extending into the interior of the metal coating (20) at the connecting surface (12) of the ceramic substrate (10) and forming a second hook portion (21) extending into the interior of the ceramic substrate (10) on the metal coating (20) include: The metal coating (20) and the ceramic substrate (10) are processed by a first laser (L1) to form a first protrusion (M1) and a second protrusion (M2) that extend into the interior of the metal coating (20) and are spaced apart on the connecting surface (12), and a third protrusion (M3) that extends into the interior of the ceramic substrate (10) is formed on the metal coating (20). The first protrusion (M1) is processed by the second laser (L2) so that the first protrusion (M1) is tilted toward the second protrusion (M2) and a fourth protrusion (M4) is formed on the outer surface of the metal coating (20). The incident direction of the second laser (L2) and the incident direction of the first laser (L1) form a preset angle (α3). The first protrusion (M1) is inclined to form the first locking hook portion (13), and the third protrusion (M3) forms the second locking hook portion (21).

9. The processing method according to claim 8, characterized in that, After the step of processing the first protrusion (M1) with the second laser (L2), the processing method further includes: The first protrusion (M1) is tilted and processed by a third laser (L3) so that the end of the first protrusion (M1) moves toward the ceramic substrate (10).

10. The processing method according to claim 8, characterized in that, The incident direction of the first laser (L1) is the normal direction of the ceramic substrate (10); and / or The preset angle (α3) between the incident direction of the second laser (L2) and the incident direction of the first laser (L1) is greater than or equal to 20° and less than or equal to 45°.

11. The processing method according to claim 9, characterized in that, The energy of the first laser (L1) is greater than the energy of the second laser (L2), and the area of ​​the first laser (L1) is greater than the area of ​​the second laser (L2); and / or The area of ​​the third laser (L3) is larger than the area of ​​the second laser (L2).

12. The processing method according to claim 8, characterized in that, The step of spraying a coating onto the connecting surface (12) of the ceramic substrate (10) to form the metal coating (20) on the connecting surface (12) includes: A central region (22) is formed by spraying paint at the center of the connecting surface (12); Spraying is performed sequentially from the central area (22) outward to obtain multiple annular areas (23) located outside the central area (22), and the thickness variation of the ceramic substrate (10) corresponding to the same annular area (23) is less than or equal to 0.2 mm; The central region (22) and the plurality of annular regions (23) form the metal coating (20).

13. The processing method according to claim 12, characterized in that, The step of spraying coatings sequentially outward from the central area (22) to obtain multiple annular areas (23) located outside the central area (22) includes: The spraying time and / or interval time of the multiple annular zones (23) are successively shortened.

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