A knee prosthesis component connection device

Abstract

The application relates to a knee joint prosthesis component connecting device, which comprises a biological fixation stem connected between a prosthesis component and a bone, the biological fixation stem comprises a conical body and a biological fusion layer arranged on the peripheral side wall of the conical body, and the biological fusion layer and the conical body jointly form a flat conical structure of the biological fixation stem, and the biological fusion layer comprises an elastic porous layer fixedly attached to the conical body. The knee joint prosthesis component connecting device can effectively ensure the connection reliability of the knee joint prosthesis component and the bone of a patient, and has good biological compatibility.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more specifically, to a connection device for knee joint prosthesis components. Background Technology

[0002] Knee replacement surgery involves implanting a prosthesis to replace a diseased or damaged joint. During the implantation process, the femoral and tibial components are placed in the knee joint and connected to the femur and tibia respectively using connecting components.

[0003] Existing knee joint prosthesis components cannot effectively guarantee the stability and reliability of their connection with the bone, which can cause bone fractures in severe cases. Furthermore, the surface of the connecting components is difficult to integrate with the bone, resulting in poor biocompatibility. Summary of the Invention

[0004] The purpose of this application is to provide a knee joint prosthesis component connection device that can effectively ensure the reliability of the connection between the knee joint prosthesis component and the patient's bone, and has good biocompatibility.

[0005] To achieve the above objectives, the present invention provides a knee joint prosthesis component connection device, including a bio-fixation handle connected between the prosthesis component and the bone. The bio-fixation handle includes a conical body and a biofusion layer. The biofusion layer is disposed on the outer sidewall of the conical body, together forming a flat conical structure of the bio-fixation handle. The biofusion layer includes an elastic porous layer fixedly attached to the conical body.

[0006] In an optional embodiment, the elastic porous layer is bonded to the conical body by laser 3D printing;

[0007] The elastic porous layer is arranged on the annular conical surface of the biological fixation stalk, and the porosity is 50%-80%.

[0008] In an optional embodiment, the biological fixation handle includes a tapered insertion end and a tapered connection end. The insertion end is used to drive the biological fixation handle into the bone, and the connection end is used to connect with the prosthesis component. The insertion end and the connection end are respectively provided with conical holes.

[0009] In an optional embodiment, the insertion end is connected to an extension rod for guiding an opening in the bone, and the tail end of the extension rod is connected to an extension rod cone.

[0010] The prosthetic component has a component cone rod on its side relative to the biological fixation handle;

[0011] The tapered hole includes an extension rod tapered hole and a component tapered hole. The extension rod tapered hole is located on the end platform of the insertion end and is inserted into the extension rod tapered rod.

[0012] The component's conical hole is located on the end platform of the connecting end and is inserted into the component's conical rod.

[0013] In an optional embodiment, both the extension rod conical hole and the component conical hole are countersunk holes. Relative to the axial direction of the biological fixation handle, the two conical holes extend towards each other, and the depth of the component conical hole is greater than the depth of the extension rod conical hole.

[0014] In an optional embodiment, the axis of the extension rod conical hole does not coincide with the axis of the component conical hole, and the distance between their axes is 0-5mm. The axes of the extension rod conical hole, the component conical hole, and the biological fixation handle are arranged in parallel.

[0015] In an optional embodiment, both the component tapered hole and the extension rod tapered hole are Morse taper holes, the taper angle of the Morse taper hole is the Morse angle, and the surface roughness of the taper hole is Ra0.5 to Ra1.0.

[0016] In an optional embodiment, the biological fixation handle is provided with a connection hole, the connection hole including a through hole that passes through both the biological fusion layer and the side wall of the conical body, and the opening direction is perpendicular to the axial direction of the conical body;

[0017] A locking screw is inserted into the connecting hole. The head end of both the extension rod tapered rod and the component tapered rod is provided with a locking ring groove. The head end of the locking screw engages and abuts in the locking ring groove.

[0018] In an optional embodiment, the biological fixation handle includes a wide-side axial section and a narrow-side axial section;

[0019] On the narrow side axis, the elastic porous layer has the same adhesion thickness on both sides of the outer side of the conical body, and the junction of the elastic porous layer and the conical body is a straight line with an adhesion thickness of 1-5 mm. A chamfer is provided on the surface of the elastic porous layer on one side, and the chamfer is provided at the connecting end and exposed to the conical body.

[0020] On the wide-side axis, the adhesion thickness of the elastic porous layer on both sides of the outer side of the conical body gradually increases from the insertion end to the connection end, and the junction of the elastic porous layer and the conical body is a concave arc.

[0021] In an optional embodiment, the minimum thickness of the elastic porous layer on the wide-side axis is not less than the thickness on the narrow-side axis.

[0022] The connection between the prosthesis and the bone is achieved through a biological fixation shank that links the bone to the prosthesis, effectively installing the prosthesis between the femur and tibia.

[0023] The bio-fixation handle includes a conical body and a biofusion layer. The biofusion layer is located on the outer sidewall of the conical body. The conical body provides rigid support for the biofusion layer, which is conducive to the elastic deformation of the biofusion layer based on the conical body. This ensures that the bio-fixation handle is effectively installed in the bone and enhances the reliability and stability of the bio-fixation handle and the bone fusion fixation.

[0024] The cone-shaped body and the biofusion layer form a flat cone-shaped combination of the biofixation handle, which facilitates the insertion of the biofixation handle into the bone. At the same time, it can further ensure the stability of the biofixation handle in the bone by means of a wedge-shaped structure.

[0025] The biofusion layer includes an elastic porous layer fixedly attached to the conical body, which has a high porosity and can provide a certain elastic deformation during the insertion process of the biofixation handle into the bone and the fusion growth process in the bone, while also facilitating the biofusion of the biofixation handle into the bone.

[0026] The porous layer structure facilitates bone ingrowth, while its high elastic modulus minimizes stress transmission from the rigid conical body to the bone, greatly reducing the risk of bone fracture during implantation of the biological fixation shank.

[0027] The knee joint prosthesis component connection device of the present invention can effectively connect the prosthesis component between the femur and tibia, and is stably and reliably fixed in the bone by the biological fixation handle. Combined with the external connection of the prosthesis component and the biological fixation handle relative to the bone, it can effectively ensure the stability and reliability of the prosthesis component in the body.

[0028] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the overall structure of the knee joint prosthesis component connection device in this application;

[0031] Figure 2This is a schematic diagram of the connection structure between the biological fixation handle and the tibial component in this application;

[0032] Figure 3 for Figure 2 A schematic diagram of the side view structure;

[0033] Figure 4 for Figure 2 A schematic diagram of the cross-sectional structure;

[0034] Figure 5 A schematic diagram showing the fit between the tapered hole of the extension rod and the tapered hole of the component;

[0035] Figure 6 A schematic cross-sectional view of the narrow side of the biological fixation handle.

[0036] Figure 7 A schematic cross-sectional view of the long side axial section of the biological fixation stalk;

[0037] Figure 8 This is a schematic diagram of the extension rod.

[0038] icon:

[0039] 1-Biological fixation handle; 11-Conical body; 12-Insert end; 13-Connecting end; 14-Extension rod conical hole; 15-Component conical hole; 16-Connecting hole; 17-Locking screw;

[0040] 2-Elastic porous layer; 21-Beveled section;

[0041] 3-Extension rod; 31-Extension rod tapered rod;

[0042] 4-Prosthetic component; 4a-Femoral component; 4b-Tibial component; 41-Component cone rod;

[0043] 5-Locking ring groove. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0045] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] The knee joint prosthesis component 4 connecting device in this application is mainly used for the connection between the prosthesis component 4 and the bone. By improving the fusion of the connecting component with the bone and the connection between the connecting component and the prosthesis component 4, it ensures the stability of the connection between the connecting component and the bone, as well as between the prosthesis component 4 and the connecting component. At the same time, it enhances the biocompatibility between the connecting component and the bone, which is conducive to the biocompatibility between the bone and the connecting component and reduces the risk of bone fracture during implantation and fixation.

[0048] See Figure 1 and combined Figures 2-4 The knee joint prosthesis component 4 connection device of the present invention has a main structure including a biological fixation handle 1 as a connection component. The biological fixation handle 1 is connected between the prosthesis component 4 and the bone, and serves as a connection component between the prosthesis component 4 and the bone.

[0049] The biological fixation handle 1 mainly includes a conical body 11 and a biological fusion layer. The main purpose of the conical body 11 is to provide a rigid support base for the insertion of the biological fixation handle 1 into the bone.

[0050] The biofusion layer is mainly used for elastic deformation during the insertion and implantation process. By using a high elastic modulus, it minimizes the stress transmission of the rigid base cone body 11 to the bone, avoiding the risk of bone fracture. At the same time, it can facilitate bone growth on the biofusion layer after the prosthesis component 4 is implanted, thereby enhancing the biofusion and strengthening the bond between the biofixation stem 1 and the bone.

[0051] Based on the above two aspects, the biofusion layer is disposed on the outer sidewall of the cone-shaped body 11, so that the cone-shaped body 11 and the biofusion layer attached to its outer sidewall together constitute the flat cone-shaped structure of the biofixing handle 1.

[0052] The bio-fixation handle 1, with its flattened conical structure, allows for easy insertion into the bone via a wedge-like design. Simultaneously, it increases the coverage area of ​​the biofusion layer on the bio-fixation handle 1, effectively ensuring elastic modulus and promoting bone growth.

[0053] The biofusion layer includes an elastic porous layer 2 fixedly attached to the conical body 11. The elastic porous layer 2 has a good elastic modulus and ultra-high porosity, which can effectively undergo elastic deformation and facilitate the attachment and growth of bone cells on the elastic porous layer 2. After implantation for a period of time, it can enable the biofixation handle 1 to effectively bio-integrate with the bone, thereby enhancing the stability of the biofixation handle 1 in integration with the bone.

[0054] The functions of the elastic porous layer 2 are mainly divided into elastic deformation and the ability to facilitate the later growth of bone on it through high porosity.

[0055] The elastic porous layer 2 in this invention includes a titanium alloy porous layer, which is bonded to the conical body 11 by laser 3D printing. Compared with the existing sintering of metal powder particles on a rigid base structure, the form of attaching the elastic porous layer 2 to the rigid base surface by laser 3D printing can give the titanium alloy better elastic deformation function, so that different titanium alloy particles are microscopically connected by bridging. Combined with the memory deformation function of the titanium alloy itself, the elastic deformation of the biofusion layer can be guaranteed to the greatest extent. This enhances the self-adaptation ability with the bone cavity during bone implantation, and minimizes stress transmission to the bone with high elastic modulus, fundamentally avoiding the occurrence of bone fracture.

[0056] In addition, the porous titanium alloy layer combined with the conical body 11 by laser 3D printing has a high porosity, which provides the basic conditions for the elastic deformation of the biofusion layer. At the same time, it can facilitate the penetration and attachment of bone cells in the porous channels, and promote the growth of bone on the biofusion layer. Overall, it improves the biocompatibility that existing sintered metal powder particles cannot achieve.

[0057] Preferably, the porous titanium alloy layer is disposed on the annular conical surface of the biological fixation handle 1. Further, based on the flat conical structure of the biological fixation handle 1, the porous titanium alloy layer is disposed on the overall outer annular conical surface of the flat conical structure, which can maximize the disposal area of ​​the porous titanium alloy layer.

[0058] From the perspective of promoting bone growth, the porosity of the titanium alloy porous layer in this invention is 50%-80%, which enables bone to effectively enter the pores of the titanium alloy porous layer and enhances the biofusion effect between bone and the titanium alloy porous layer.

[0059] Besides titanium alloys, tantalum alloy porous layers can also be prepared by processing tantalum alloys, which can also achieve the technical objective of enhancing the biofusion effect in this application.

[0060] In one specific embodiment, the biological fixation handle 1 includes a tapered insertion end 12 and a tapered connection end 13, with the insertion end 12 oriented toward the bone to be inserted and the connection end 13 oriented toward the prosthetic component 4 to be connected.

[0061] Specifically, the insertion end 12 is used to drive the biological fixation handle 1 into the bone, and the connection end 13 is used to connect with the prosthesis component 4. To facilitate connection, conical holes are provided on the insertion end 12 and the connection end 13 respectively.

[0062] See Figure 5 and combined Figure 8 The biological fixation handle 1 is installed in the bone by inserting an extension rod 3. Specifically, the insertion end 12 is connected to an extension rod 3 for guiding the opening of a path in the bone. The main function of the extension rod 3 is to establish a passage in the medullary cavity of the bone and to insert and attach it to the bone.

[0063] During implantation, the biological fixation handle 1 is connected to the tail end of the extension rod 3. As the extension rod 3 is inserted into the bone medullary cavity, the biological fixation handle 1 is driven to be inserted into the end of the bone.

[0064] Starting from the connection angles between the two ends of the biological fixation handle 1 and the extension rod 3 and the prosthesis component 4 respectively, an extension rod cone 31 is connected to the tail end of the extension rod 3, and a component cone 41 is provided on the side of the prosthesis component 4 relative to the biological fixation handle 1. The extension rod cone 31 and the component cone 41 are respectively connected to the insertion end 12 and the connection end 13 of the biological fixation handle 1.

[0065] Based on this, the conical hole on the biological fixation handle 1 further includes an extension rod conical hole 14 and a component conical hole 15. The extension rod conical hole 14 is mainly connected and engaged with the extension rod conical 31 and is set on the insertion end 12 of the biological fixation handle 1. Specifically, the insertion end 12 of the biological fixation handle 1 includes a flat end platform, and the extension rod conical hole 14 is set on the end platform of the insertion end 12 and is inserted and engaged with the extension rod conical 31.

[0066] The component cone hole 15 is mainly used to connect and cooperate with the component cone rod 41. It is set on the connecting end 13 of the biological fixation handle 1. Specifically, the connecting end 13 of the biological fixation handle 1 includes a flat end platform. The component cone hole 15 is set on the end platform of the insertion end 12 and is inserted and cooperated with the component cone rod 41.

[0067] With this configuration, the biological fixation handle 1 can be connected to the extension rod 3 and the prosthetic component 4 respectively. Combined with the insertion and fixation of the extension rod 3 in the bone, the biological fixation handle 1 can fully realize the connection function between the bone and the prosthetic component 4.

[0068] Preferably, the extension rod cone hole 14 and the component cone hole 15 are both countersunk holes opened on the end platform of the biological fixation handle 1, and have a certain inward cone angle along the insertion direction of the cone rod, so that the cone rod can be effectively connected in the cone hole.

[0069] Based on the connection of the extension rod 3 and the prosthetic component 4 on both sides of the biological fixation handle 1, the two conical holes extend towards each other relative to the axial direction of the biological fixation handle 1, which allows the two conical rods on the structure to be axially installed on the biological fixation handle 1, ensuring the reliability of the installation of the extension rod 3 and the prosthetic component 4 on the biological fixation handle 1.

[0070] Preferably, the depth of the component cone hole 15 is greater than the depth of the extension rod cone hole 14, which can ensure the connection strength between the prosthesis component 4 and the biological fixation handle 1.

[0071] The prosthetic component 4 in this invention specifically includes a femoral component 4a located at the upper part and a tibial component 4b located at the lower part. In actual use, with the extension rod 3 fixed to the femoral and tibial medullary cavities respectively, in order to adjust the alignment of the femoral component 4a and the tibial component 4b in the body, it is necessary to limit the application angle of the extension rod 3 and the prosthetic component 4 on the biological fixation handle 1.

[0072] Based on this, the axis of the extension rod cone hole 14 and the axis of the component cone hole 15 are not on the same axis, and their axes do not coincide. With this setting, the position of the femoral component 4a and the tibia component 4b relative to the extension rod 3, i.e. relative to the bone, can be adjusted according to the biological characteristics of the human knee joint. This allows the femoral component 4a and the tibia component 4b to achieve alignment in both anterior-posterior and vertical positions, effectively avoiding the risk of bone fracture caused by misalignment of the femur and tibia after surgery.

[0073] Specifically, the axes of the extension rod conical hole 14, the component conical hole 15, and the biological fixation handle 1 are arranged in parallel. More preferably, the axis of the biological fixation handle 1 coincides with the axis of the extension rod conical hole 14, and the distance between the axis of the extension rod conical hole 14 and the axis of the component conical hole 15 is 0-5mm.

[0074] Preferably, the distance between the axis of the extension rod taper hole 14 and the axis of the component taper hole 15 is 2-4.5 mm, which can meet the alignment requirements of the femoral component 4a and the tibial component 4b. At the same time, it can reduce the knee joint flexion gap, ensure the balance of the flexion and extension gaps, and meet clinical needs.

[0075] The distance between the axis of the extension rod cone hole 14 and the axis of the component cone hole 15 can be met by setting different specifications of biological fixation handles 1 to meet the implantation needs of specific patients, which will not be elaborated here.

[0076] In another specific embodiment, both the component tapered hole 15 and the extension rod tapered hole 14 are Morse taper holes, the taper angle of the Morse taper hole is the Morse angle, and the surface roughness of the taper hole is Ra0.5 to Ra1.0.

[0077] By using the Morse taper hole and the Morse angle within it, and by setting the extension rod taper 31 and component taper 41 in the form of a Morse taper, after the Morse taper self-locks, the rough surface can provide sufficient anti-rotation force for the extension rod 3 and femoral component 4a or tibial component 4b, ensuring a stable and reliable connection between the biological fixation handle 1, the extension rod 3, and the prosthesis component 4.

[0078] By setting both the component cone hole 15 and the extension rod cone hole 14 in the form of Morse taper holes, the axial ends of the biological fixation handle 1 can be effectively connected to the extension rod 3 and the prosthetic component 4.

[0079] Combination Figure 4 In addition to the axial connection and fixation at both ends, a fastening connection assembly is also provided radially on the biological fixation handle 1. Specifically, the biological fixation handle 1 is provided with a connection hole 16, which includes a through hole that passes laterally through both the biofusion layer and the side wall of the conical body 11, and the opening direction is perpendicular to the axial direction of the conical body 11;

[0080] A locking screw 17 is inserted into the connecting hole 16. The head end of the extension rod cone 31 and the component cone 41 are both provided with locking ring grooves 5. The head end of the locking screw 17 engages and abuts in the locking ring grooves 5, eliminating the possibility of loosening after the Morse taper self-locks.

[0081] The Morse taper, through a rough-surface insertion fit in the Morse taper hole, combined with a radial fastening component, can fix the taper rod in the taper hole from two different angles, ensuring a stable connection.

[0082] See Figures 6-7 Based on the flattened conical structure of the biological fixation handle 1, the biological fixation handle 1 in this invention includes a wide axial side and a narrow axial side. The wide axial side corresponds to the inner and outer sides of the biological fixation handle 1, and the narrow axial side corresponds to the front and rear sides of the biological fixation handle 1.

[0083] On the narrow-sided axis, i.e., in the anteroposterior direction of the biological fixation handle 1, the elastic porous layer 2 has the same adhesion thickness on both sides of the outer surface of the conical body 11. The outer side of the cross-section of the elastic porous layer 2 is conical and has a straight structure. The junction between the elastic porous layer 2 and the conical body 11 is also straight. The adhesion thickness of the elastic porous layer 2 on the conical body 11 is 1-5 mm. Preferably, in the anteroposterior direction of the biological fixation handle 1, the thickness of the elastic porous layer 2 is less than the thickness of the conical body 11.

[0084] This configuration ensures that the rigid support provided by the internal conical body 11 is maximized on the front and rear sides of the biological fixation handle 1, so that the biological fixation handle 1 has sufficient strength.

[0085] Meanwhile, on one side of the biological fixation handle 1, preferably on the front side, a beveled surface 21 is provided on the surface of the elastic porous layer 2. The beveled surface 21 is provided at the connecting end 13 and is radially outward along the direction of the insertion end 12, exposing the conical body 11. The thinnest wall thickness of the conical body 11 is guaranteed to be 1-3 mm. This arrangement provides clearance space for the cortical bone on the anterior side of the femur and tibia, and can preserve the bone volume of the cortical bone on the anterior side of the femur and tibia as much as possible. By preserving the bone volume, the original strength of the bone is enhanced, and the possibility of bone fracture is reduced.

[0086] On the wide-side axis, that is, in the direction of the inner and outer sides of the biological fixation handle 1, the thickness of the elastic porous layer 2 attached to both sides of the outer side of the conical body 11 gradually increases from the insertion end 12 to the connection end 13, and the junction of the elastic porous layer 2 and the conical body 11 is a concave arc.

[0087] Specifically, in the inner and outer directions of the biological fixation handle 1, the outer side of the cross section of the elastic porous layer 2 is tapered and has a straight structure. The junction of the elastic porous layer 2 and the tapered body 11 is a concave arc. The inner tapered body 11 ensures a minimum wall thickness of 1 to 3 mm. Furthermore, the adhesion thickness of the elastic porous layer 2 on both sides of the outer side of the tapered body 11 gradually increases from the insertion end 12 to the connection end 13.

[0088] This design ensures increased thickness of the elastic porous layer 2 in both the inner and outer directions, enhancing the elastic modulus of the biological fixation handle 1 to provide sufficient elasticity. In this way, while the elastic porous layers 2 on both the inner and outer sides of the biological fixation handle 1 are engaged with the cortical bone, they also allow for greater contact with cancellous bone, thus achieving the long-term bone growth effect of the biological fixation handle 1.

[0089] In addition, the minimum thickness of the elastic porous layer 2 on the wide side axis is not less than the thickness on the narrow side axis. By ensuring the amount of elastic porous layer 2 attached to the inner and outer sides, the elastic porous layer 2 can come into contact with more cancellous bone, improve biocompatibility, and is more conducive to the attachment and growth of cancellous bone.

[0090] Based on the femoral prosthesis component 4 and the tibial prosthesis component 4 included in the prosthesis component 4, the biological fixation handle 1 includes a femoral fixation handle and a tibial fixation handle. The tibial fixation handle has a fixed connecting end 13 with a diameter A and a fixed axial height B. The cone angle α of the elastic porous layer 2 is 15-50° to meet the fixation depth of the tibial fixation handle embedded in the tibia, and to lock the medial and lateral cortex of the tibia through the fixation handle with a suitable cone angle α.

[0091] The femoral fixation stem has a fixed connecting end 13 with a diameter A and an elastic porous layer 2 with a cone angle α and an axial height B of 40-80 mm, in order to meet the adjustment of the distal femoral joint line and ensure the balance of the extension and flexion gap.

[0092] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0093] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A knee prosthesis component connection device, characterized in that, The application relates to a biological fixation stem connected between a prosthetic component and a bone, which comprises a tapered body and a biological fusion layer arranged on the peripheral sidewall of the tapered body, and jointly forms a flat-tapered structure of the biological fixation stem, wherein the biological fusion layer comprises an elastic porous layer fixedly attached to the tapered body, and the elastic porous layer is combined with the tapered body through laser 3D printing. The elastic porous layer is arranged on the annular taper surface of the biological fixation stem, and the porosity is 50%-80%. The biological fixation stem comprises a tapered insertion end and a tapered connection end, the insertion end is connected with an extension rod used for guiding an opening in the bone, the tail end of the extension rod is connected with an extension rod taper, and the prosthetic component is provided with a component taper relative to the side of the biological fixation stem. The insertion end and the connection end are respectively provided with taper holes, and the taper holes comprise an extension rod taper hole and a component taper hole. The axis of the extension rod taper hole is not coincident with the axis of the component taper hole, the distance between the two axes is 0-5mm, and the axes of the extension rod taper hole, the component taper hole and the biological fixation stem are arranged in parallel. The biological fixation stem is provided with a connecting hole, the connecting hole comprises a through hole penetrating through the biological fusion layer and the sidewall of the tapered body, and the opening direction is perpendicular to the axial direction of the tapered body. A locking screw is inserted into the connecting hole, the head end of the extension rod taper and the head end of the component taper are respectively provided with a locking ring groove, and the head end of the locking screw is engaged and abuts in the locking ring groove. The biological fixation stem comprises a wide-axle side and a narrow-axle side. On the narrow-axle side, the attachment thickness of the elastic porous layer on the two sides of the tapered body is the same, the intersection part of the elastic porous layer and the tapered body is a straight line, the attachment thickness is 1-5mm, and a bevel surface is arranged on the surface of the elastic porous layer on one side, the bevel surface is arranged on the connection end and exposed to the tapered body. On the wide-axle side, the attachment thickness of the elastic porous layer on the two sides of the tapered body gradually increases in the extension direction from the insertion end to the connection end, and the intersection part of the elastic porous layer and the tapered body is a concave arc line. The minimum thickness of the elastic porous layer on the wide-axle side is not less than the thickness on the narrow-axle side.

2. The knee prosthesis component connection apparatus of claim 1, wherein, The insertion end is used for driving the biological fixation stem to extend into the bone, and the connection end is used for connecting with the prosthetic component.

3. The knee prosthesis component connection apparatus of claim 2, wherein, The extension rod taper hole is arranged on the end platform of the insertion end and is inserted and matched with the extension rod taper. The component taper hole is arranged on the end platform of the connection end and is inserted and matched with the component taper.

4. The knee prosthesis component connection apparatus of claim 3, wherein, The extension rod taper hole and the component taper hole are both counterbore structures, and the two taper holes extend towards each other relative to the axial direction of the biological fixation stem.

5. The knee prosthesis component connection apparatus of claim 3, wherein, The component taper hole and the extension rod taper hole are both Morse taper holes, the taper angle of the Morse taper hole is a Morse angle, and the roughness of the surface of the taper hole is Ra0.5-Ra1.0.

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