Femoral component

Abstract

The invention relates to the technical field of medical treatment, and discloses a thighbone component which comprises a thighbone component body, the thighbone component body is of an anatomical type, the articular surface of the thighbone component body is of a spherical connection multi-radius curve design, the thighbone component body comprises a thighbone far-end side, an anterior condyle side, a stand column and a posterior condyle side, the thighbone far-end side is a rotary osteotomy, the anterior condyle side is a rotary osteotomy, and the stand column is a vertical column. The posterior condyle side adopts non-parallel osteotomy, a positioning groove is formed in the outer wall of the stand column, one end of the stand column is fixedly connected to the inner wall of the posterior condyle side, the posterior condyle side is attached to the bone section, and the anatomical asymmetric design is adopted for the anatomical asymmetric design. Through the rotary osteotomy design of the distal end side and the precondyle side of the femur, the track and the angle are clearer, errors in an operation can be reduced, the osteotomy accuracy is improved, good conditions are created for accurate implantation of a femur component, and the flexion and flexion gap balance degree after the femur component is installed is improved.

Description

Technical Field

[0001] The present invention relates to the field of medical technology, and specifically to a femoral component. Background Art

[0002] Knee osteoarthritis is a common joint disease, and in many cases, the lesion is often limited to the medial or lateral unicompartment. According to statistics, about 60%-70% of patients with knee osteoarthritis initially present only with unicompartmental lesions. For such patients, unicompartmental knee arthroplasty only needs to replace the diseased unicompartment, retaining the relatively normal joint structure and function, which is a more precise and effective treatment method, providing a broad clinical demand basis for the application of the femoral component of the unicompartmental knee prosthesis.

[0003] The existing femoral component of the fixed-platform unicompartmental knee prosthesis has a flat osteotomy, which is prone to inaccurate osteotomy during the operation, resulting in an imbalance in the flexion and extension gaps after the prosthesis is installed and poor postoperative effects. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a femoral component, which solves the problems that the existing femoral component of the fixed-platform unicompartmental knee prosthesis has a flat osteotomy, is prone to inaccurate osteotomy during the operation, resulting in an imbalance in the flexion and extension gaps after the prosthesis is installed and poor postoperative effects.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A femoral component, including the femoral component, the femoral component is anatomical, the joint surface is designed with a spherical connection of multi-radius curves, the femoral component includes a distal femoral side, a medial condyle side, a pillar, and a lateral condyle side, the distal femoral side is a rotary osteotomy, the medial condyle side is a rotary osteotomy, the lateral condyle side uses a non-parallel osteotomy, a positioning groove is provided on the outer wall of the pillar, one end of the pillar is fixedly connected to the inner wall of the lateral condyle side, the lateral condyle side fits with the bone cross-section, the medial condyle side is designed as an anatomical asymmetric type, and the outer surface of the femoral component uses a ceramic coating.

[0006] Preferably, the posterior condylar osteotomy surface has a 2° angle with the pillar.

[0007] Preferably, the treatment method of the ceramic coating of the femoral component includes the following steps: S1. Substrate pretreatment: After cleaning, degreasing, then plasma cleaning, and finally roughening and activation to prepare for the coating; S2. Coating deposition: Depositing a ceramic coating by plasma spraying; S3. Post-treatment: After heat treatment, ultraviolet ozone cleaning is carried out.

[0008] In the step S1, during the cleaning process, acetone is used for ultrasonic cleaning at 40 - 60 °C for 10 - 15 minutes. During the degreasing process, a sodium hydroxide solution with a mass fraction of 5% - 10% is used and soaked at 50 - 70 °C for 15 - 20 minutes. After degreasing, the surface contact angle is less than 5°.

[0009] In the step S1, in the plasma cleaning, the gas type is selected as oxygen, the gas flow rate is 5 - 30 sccm, the power range is 50 - 300 W, the power mode is selected as continuous wave, the working pressure is 0.1 - 10 Pa, the cleaning time is 3 - 15 minutes, and the substrate temperature is controlled below 50 °C.

[0010] In the step S1, for sandblasting and roughening, alumina sand with a mesh size of 100 - 120 is selected, the sandblasting pressure is 0.4 - 0.5 MPa, the surface roughness after roughening reaches Ra4 - 5 μm, and it is soaked in a dilute sulfuric acid solution with a volume fraction of 5% - 10% for 3 - 5 minutes. After activation, the surface potential is between -0.2 and -0.3 V.

[0011] In the step S2, the preheating temperature of the femoral component 1 is 80 - 150 °C, the powder feeding gas flow rate is 5 - 15 L / min, the gas used is argon, the main gas flow rate is 30 - 50 L / min, the power is 20 - 35 kW, the voltage is 40 - 80 V, and the current is 300 - 600 A.

[0012] In the step S2, the spraying distance is controlled within 70 - 150 mm, the powder feeding rate is 10 - 30 g / min, and the spraying angle is 60° - 80°.

[0013] In the step S3, the heating temperature is set at 550 - 750 °C, the heating rate is controlled at 8 - 15 °C / min, ensuring that the temperature deviation at each point in the furnace is within ±3 °C, the holding time is set at 2 - 4 hours, the cooling method is air cooling, and the cooling time is generally 2 - 4 hours.

[0014] In the step S3, for ultraviolet ozone cleaning, the light source wavelength adopts dual wavelengths of 185 nm and 254 nm, the light source power range is 150 - 300 W, the average light intensity is maintained at 28 - 32 mW / cm², at a distance of 5 - 10 mm from the light source, the average light intensity reaches 30 - 35 mW / cm², the irradiation distance is controlled within the range of 10 - 30 mm, and the cleaning time is set at 15 - 30 minutes.

[0015] The present invention provides a femoral component. It has the following beneficial effects: 1. In the present invention, both the distal femoral side and the anterior condylar side of the femoral component are rotational osteotomies, with clearer trajectories and angles, which can reduce errors during surgery, improve the accuracy of osteotomy, create good conditions for the accurate implantation of the femoral component, make the femoral component highly match the anatomical structure of the femur, improve the balance of the flexion and extension gaps after the installation of the femoral component, and reduce the risk of complications such as loosening and wear of the femoral component after surgery.

[0016] 2. In the present invention, the posterior condylar side uses non - parallel osteotomy, which changes the contact angle and surface morphology between the posterior condyle and the femoral component. The non - parallel osteotomy forms a mutually interlocking morphology between the femoral component and the posterior condylar bone surface. When the joint is subjected to an external force that may cause dislocation, this interlocking structure can disperse and transform the external force, so that the dislocation force needs to overcome more resistance to dislodge the femoral component, increasing the anti - dislocation force.

[0017] 3. In the present invention, the anterior condylar side is an anatomically asymmetric design, which can more precisely match the irregular shape of the human anterior condyle, make the contact between the femoral component and the bone surface closer and more comprehensive, improve the fit, reduce the micro - motion between the femoral component and the bone, lower the risk of wear and loosening, and contribute to maintaining the long - term stability of the femoral component.

[0018] 4. In the process of treating the ceramic coating of the femoral component in the present invention, through plasma cleaning, organic pollutants on the surface of the femoral component are further removed during the substrate pretreatment process, improving the activity of the surface of the femoral component, increasing the surface energy, providing a better attachment surface for the coating, and at the same time, it can also improve the micro - structure of the surface of the femoral component and enhance the mechanical interlocking force between the coating and the femoral component. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the front view of a femoral component of the present invention; Figure 2 is the bottom view of a femoral component of the present invention; Figure 3 is the top view of a femoral component of the present invention; Figure 4 is the partial structural schematic diagram of the anterior condylar side of a femoral component of the present invention; Figure 5 is the flow chart of the treatment method of the ceramic coating of the femoral component of the present invention.

[0020] Among them, 1. femoral component; 101. distal femoral side; 102. anterior condylar side; 103. column; 104. positioning groove; 105. posterior condylar side. DETAILED DESCRIPTION OF THE INVENTION

[0021] Next, in combination with the accompanying drawings of the present invention, the technical solutions of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to the attached Figure 1 - attached Figure 4 , the embodiment of the present invention provides a femoral component, including a femoral component 1. The femoral component 1 is anatomical, and the joint surface is designed with a spherical connection of multi-radius curves. The femoral component 1 includes a distal femoral side 101, a front condyle side 102, a column 103, and a posterior condyle side 105. The distal femoral side 101 is a rotational osteotomy, the front condyle side 102 is a rotational osteotomy, the posterior condyle side 105 adopts a non-parallel osteotomy. A positioning groove 104 is provided on the outer wall of the column 103. One end of the column 103 is fixedly connected to the inner wall of the posterior condyle side 105. The posterior condyle side 105 fits with the bone section. The front condyle side 102 is designed as an anatomical asymmetric type, and the outer surface of the femoral component 1 is coated with ceramics.

[0023] Specifically, both the distal femoral side 101 and the front condyle side 102 of the femoral component 1 are rotational osteotomies. The trajectory and angle of the rotational osteotomy are more definite, which can reduce the error during the operation, improve the accuracy of osteotomy, create good conditions for the accurate implantation of the femoral component 1, enable the femoral component 1 to highly match the anatomical structure of the femur, improve the balance of the flexion and extension gap after the installation of the femoral component 1, reduce the risk of complications such as loosening and wear of the femoral component 1 after the operation, and extend the service life of the femoral component 1.

[0024] The posterior condyle side 105 adopts a non-parallel osteotomy, and the non-parallel osteotomy changes the contact angle and surface morphology between the posterior condyle and the femoral component 1. Compared with parallel osteotomy, the non-parallel osteotomy forms a mutually interlocking morphology between the femoral component 1 and the posterior condyle bone surface. When the joint is subjected to an external force that may cause dislocation, this interlocking structure can disperse and transform the external force, so that the dislocation force needs to overcome more resistance to dislocate the femoral component 1, thereby increasing the anti-displacement force.

[0025] The anterior condyle side 102 is designed with anatomical asymmetry. The anatomical asymmetric design can more precisely match the irregular shape of the human anterior condyle, making the contact between the femoral component 1 and the bone surface closer and more comprehensive, greatly improving the fit. This tight fit can reduce the micromotion between the femoral component 1 and the bone, reduce the risk of wear and loosening, and help maintain the long-term stability of the femoral component 1. When the ceramic coating is used for the femoral component 1 of the joint, it has good biocompatibility to reduce rejection and promote bone bonding, excellent wear resistance to reduce wear and extend the service life, excellent lubricity to make the joint movement smooth, good corrosion resistance to prevent material corrosion, and may also have antibacterial properties to inhibit bacteria and reduce inflammation, comprehensively improving the performance of the femoral component 1 and the rehabilitation effect of the patient.

[0026] Please refer to the attached Figure 1 -attachment Figure 4 , and the posterior condyle osteotomy surface has a 2° angle with the column 103.

[0027] Specifically, the posterior condyle osteotomy surface has a 2° angle with the column 103. During joint movement, this angle makes the contact and pressure distribution between the joint surfaces more uniform, avoiding local pressure concentration.

[0028] Please refer to 5 for the treatment method of the ceramic coating of the femoral component 1, including the following steps: S1. Substrate pretreatment: After cleaning, degreasing, then plasma cleaning, and finally roughening and activation to prepare for the coating; S2. Coating deposition: Deposit the ceramic coating by plasma spraying; S3. Post-treatment: Perform ultraviolet ozone cleaning after heat treatment.

[0029] Specifically, In step S1, during the cleaning process, acetone is used for ultrasonic cleaning at 40 - 60°C for 10 - 15 minutes. During the degreasing process, a sodium hydroxide solution with a mass fraction of 5% - 10% is used and soaked at 50 - 70°C for 15 - 20 minutes. After degreasing, the surface contact angle is less than 5°. In plasma cleaning, the gas type is selected as oxygen, the gas flow rate is 5 - 30 sccm, the power range is 50 - 300 W, the power mode is selected as continuous wave, the working pressure is 0.1 - 10 Pa, the cleaning time is 3 - 15 minutes, and the substrate temperature is controlled below 50°C. For sandblasting roughening, alumina sand with a particle size of 100 - 120 meshes is selected, the sandblasting pressure is 0.4 - 0.5 MPa, the surface roughness after roughening reaches Ra4 - 5μm, and it is soaked in a dilute sulfuric acid solution with a volume fraction of 5% - 10% for 3 - 5 minutes. After activation, the surface potential is between -0.2 and -0.3 V.

[0030] Specifically, cleaning: Implementation method: Place the femoral component 1 into an ultrasonic cleaning device filled with acetone, set the temperature within the range of 40 - 60 °C, and the cleaning time is 10 - 15 minutes. Utilize the cavitation effect of ultrasonic waves to enable acetone to penetrate into the tiny gaps and pores on the surface of the substrate, removing impurities such as dust and oil stains on the surface.

[0031] Beneficial effect: Effectively remove the dirt and impurities on the surface of the femoral component 1, provide a clean surface for subsequent processing steps, ensure that operations such as degreasing and cleaning can be carried out better, and improve the bonding force between the coating and the surface of the femoral component 1.

[0032] Degreasing: Implementation method: Prepare a sodium hydroxide solution with a mass fraction of 5% - 10%, immerse the cleaned femoral component 1 in this solution, control the temperature at 50 - 70 °C, and the immersion time is 15 - 20 minutes. The sodium hydroxide solution undergoes a saponification reaction with the grease, decomposing the grease into water-soluble substances, thereby achieving the purpose of degreasing.

[0033] Beneficial effect: Thoroughly remove the grease on the surface of the femoral component 1, make the surface of the femoral component 1 hydrophilic, reduce the surface contact angle to less than 5°, which is beneficial for subsequent plasma cleaning and coating adhesion, and improve the adhesion and uniformity of the coating.

[0034] Plasma cleaning: Implementation method: Use a plasma cleaning device, select oxygen as the cleaning gas, set the gas flow rate to 5 - 30 sccm, adjust the power range to 50 - 300 W, select the continuous wave for the power mode, control the working pressure at 0.1 - 10 Pa, place the femoral component 1 into the device for cleaning for 3 - 15 minutes, and at the same time control the substrate temperature below 50 °C through the temperature control system of the device. In the plasma environment, reactive particles such as oxygen ions chemically react with pollutants such as organic matter on the surface of the femoral component 1, decomposing them into volatile substances such as carbon dioxide and water, thereby achieving the purpose of cleaning.

[0035] Beneficial effect: Further remove the organic pollutants on the surface of the femoral component 1, improve the activity of the surface of the femoral component 1, increase the surface energy, provide a better adhesion surface for the coating, and at the same time can also improve the microscopic structure of the surface of the femoral component 1, and improve the mechanical interlocking force between the coating and the femoral component 1.

[0036] Roughening: Implementation method: Use a sandblasting device, select alumina sand with a mesh size of 100 - 120, set the sandblasting pressure to 0.4 - 0.5 MPa, and perform sandblasting on the surface of the femoral component 1 that has undergone plasma cleaning. The high-speed jet of alumina sand impacts the surface of the femoral component 1, forming an uneven microscopic structure on the surface of the femoral component 1, thereby achieving the roughening effect and making the surface roughness reach Ra4 - 5 μm.

[0037] Beneficial effects: Increase the surface roughness of the femoral component 1, expand the contact area between the coating and the femoral component 1, improve the adhesion of the coating, enable the coating to be better embedded on the surface of the femoral component 1, enhance the mechanical bonding force between the coating and the femoral component 1, and improve the stability and durability of the coating.

[0038] Activation Implementation method: Configure a dilute sulfuric acid solution with a volume fraction of 5%-10%, and immerse the roughened femoral component 1 in this solution at room temperature for 3-5 minutes. The dilute sulfuric acid reacts chemically with metal oxides and the like on the surface of the femoral component 1 to remove the oxide layer on the surface, making the surface of the femoral component 1 in an active state, so that the surface potential reaches between -0.2 and -0.3V.

[0039] Beneficial effects: Remove the oxide layer and other impurities on the surface of the femoral component 1, make the surface of the femoral component 1 have higher chemical activity, facilitate the chemical reaction between the coating material and the surface of the femoral component 1 to form chemical bonding, further improve the bonding strength between the coating and the femoral component 1, and ensure the quality and performance of the coating.

[0040] In step S2, the preheating temperature of the femoral component 1 is 80-150°C, the powder feeding gas flow rate is 5-15 L / min, the gas used is argon, the main gas flow rate is 30-50 L / min, the power is 20-35 kW, the voltage is 40-80 V, and the current is 300-600 A. The spraying distance is controlled within 70-150 mm, the powder feeding rate is 10-30 g / min, and the spraying angle is 60°-80°.

[0041] Specifically, preheat the femoral component 1: Use an electric resistance furnace to preheat the femoral component 1. Place the femoral component 1 in the heating device, set the heating temperature range to 80-150°C, and monitor the temperature of the femoral component 1 in real time through a temperature sensor. After reaching the preset temperature, keep it for a period of time to make the overall temperature of the femoral component 1 uniform. The purpose of preheating is to remove the moisture on the surface of the femoral component 1, improve the activation state of the surface of the femoral component 1, and at the same time reduce the thermal stress between the coating and the substrate during the spraying process.

[0042] Beneficial effects: Preheating the femoral component 1 can reduce the thermal stress between the coating and the substrate, and avoid cracking or peeling of the coating during the cooling process due to thermal expansion differences. At the same time, preheating can also improve the activity of the substrate surface and enhance the chemical bonding and mechanical bonding force between the coating and the substrate.

[0043] Gas supply: Powder feeding gas: Argon is used as the powder feeding gas and transported to the spray gun. The powder feeding gas flow rate is precisely adjusted by a gas flow controller to be stable within the range of 5 - 15 L / min. The role of the powder feeding gas is to uniformly and stably transport the ceramic powder into the plasma jet.

[0044] Power, voltage and current adjustment: Connect the power supply of the plasma spraying equipment. According to the process requirements, adjust the power to the range of 20 - 35 kW. By adjusting the output parameters of the power supply, keep the voltage at 40 - 80 V and the current stable at 300 - 600 A. Appropriate power, voltage and current can ensure that the plasma has sufficient energy to melt the ceramic powder and make it spray onto the surface of the femoral component 1 at an appropriate speed.

[0045] Spraying operation: Spraying distance: Use an adjustable spray gun support or robotic arm to control the distance between the spray gun and the femoral component 1 within 70 - 150 mm. During spraying, keep this distance stable to ensure that the ceramic powder has an appropriate temperature and speed when reaching the surface of the femoral component 1, thus forming a coating with good quality.

[0046] Powder feeding rate: Precisely control the powder feeding rate of the ceramic powder through the adjustment device of the powder feeder to be within the range of 10 - 30 g / min. The stability of the powder feeding rate is crucial for the thickness uniformity and quality of the coating.

[0047] Spraying angle: Adjust the angle of the spray gun so that the angle between it and the surface of the femoral component 1 is between 60° - 80° and not less than 45°. An angle measuring instrument can be used for precise adjustment to avoid the "shadowing effect" and ensure that the coating can uniformly cover the surface of the femoral component 1.

[0048] Beneficial effects: Precisely controlling the powder feeding gas flow rate, powder feeding rate, spraying distance and spraying angle can ensure that the ceramic powder is uniformly transported into the plasma jet and uniformly deposited on the surface of the femoral component 1. This helps to obtain a coating with uniform thickness, dense structure and stable performance, reduce defects such as pores and cracks in the coating, and improve the wear resistance, corrosion resistance and oxidation resistance of the coating.

[0049] In step S3, the heating temperature is set at 550 - 750 °C, the heating rate is controlled at 8 - 15 °C / min, ensuring that the temperature deviation at each point in the furnace is within ±3 °C. The holding time is set to 2 - 4 hours, and the cooling method is air cooling, with the cooling time generally being 2 - 4 hours. The ultraviolet ozone cleaning light source uses a dual wavelength of 185 nm and 254 nm, the light source power range is 150 - 300 W, and the average light intensity is maintained at 28 - 32 mW / cm². At a distance of 5 - 10 mm from the light source, the average light intensity reaches 30 - 35 mW / cm², the irradiation distance is controlled within the range of 10 - 30 mm, and the cleaning time is set at 15 - 30 minutes.

[0050] Specifically, heat treatment: Heating and heating rate control: Select a heat treatment furnace with high-precision temperature control function, and put the femur component 1 after coating deposition into the furnace.

[0051] According to the characteristics of the coating and the substrate material, accurately set the heating temperature in the temperature control system of the heat treatment furnace to 550 - 750 °C.

[0052] Set the heating rate to 8 - 15 °C / min, and use the heating elements (such as resistance wires) and temperature sensors in the furnace to cooperate with the temperature control system to accurately control the heating process, ensuring that the heating rate is stable within the set range.

[0053] Arrange multiple temperature sensors at different positions in the furnace to monitor the temperature at each point in real time, and adjust the heating power through feedback to ensure that the temperature deviation at each point in the furnace is within ±3 °C.

[0054] Holding stage: When the temperature in the furnace reaches the set heating temperature, start the holding program. Set the holding time according to the coating thickness and performance requirements. For thicker coatings or cases where sufficient tissue transformation is required, set the holding time to 3 - 4 hours; for thinner coatings or only simple stress relief is needed, set it to 2 - 3 hours.

[0055] During the holding process, continuously monitor the temperature in the furnace to ensure that the temperature is stable near the set value.

[0056] Cooling stage: After the holding time ends, open the furnace door and use air cooling for cooling. Air cooling means allowing the femur component 1 to cool in the naturally convective air.

[0057] Record the cooling time, generally controlled at 2 - 4 hours, to slowly cool the femur component 1 to room temperature.

[0058] Beneficial effects: Through heat treatment, at appropriate heating temperatures and holding times, the atoms of the coating and the substrate material can be rearranged, effectively eliminating internal stress, reducing the risk of coating cracking and peeling, and improving the bonding strength between the coating and the substrate and the stability of the coating.

[0059] Ultraviolet ozone cleaning: Equipment preparation: Select a cleaning device equipped with 185nm and 254nm dual-wavelength ultraviolet lamps, and adjust the light source power to the range of 150 - 300W according to the process requirements.

[0060] Use a light intensity measuring instrument to measure the light intensity at a distance of 5 - 10mm from the light source, and by adjusting the light source power or the distance between the light source and the measurement point, make the average light intensity reach 30 - 35mW / cm².

[0061] Cleaning operation: Place the heat-treated femoral component 1 on the workbench of the cleaning device, and adjust the irradiation distance between the femoral component 1 and the ultraviolet lamp to control it within the range of 10 - 30mm.

[0062] Set the cleaning time to 15 - 30 minutes, start the cleaning device, and the ultraviolet rays emitted by the ultraviolet lamp excite the oxygen in the air to generate ozone. The ozone and ultraviolet rays work together to remove the organic matter, impurities, and oxide layer on the surface of the femoral component 1.

[0063] Beneficial effects: Ultraviolet ozone cleaning can utilize the strong oxidizing property of ozone and the photolysis effect of ultraviolet rays to effectively decompose and remove impurities such as organic matter, oil stains, and dust on the surface of the femoral component 1, making the coating surface cleaner and improving the surface quality and performance of the coating. During the cleaning process, the action of ultraviolet rays and ozone can make the atoms or molecules on the coating surface be in a higher active state, increasing the surface energy, which is beneficial to the subsequent combination of the coating with other substances, such as better compatibility with biological tissues during subsequent use (for applications in the biomedical field) or compounding with other coatings, etc.

[0064] Detection: After heat treatment and cleaning are completed, use a variety of detection means to detect the coating quality, such as using a hardness testing device to detect the coating hardness, observing the coating microstructure with a microscope, and using non-destructive testing methods such as ultrasonic flaw detection to check whether there are defects inside the coating, etc., to ensure that the coating quality meets the relevant standards and usage requirements.

[0065] Beneficial effects: Through comprehensive and accurate detection, quality problems existing in the coating can be timely discovered, such as the hardness not meeting the requirements, internal defects, etc. So as to timely process the unqualified femoral component 1 or adjust the process parameters, ensure the consistency and reliability of product quality, and ensure that the coating can meet the performance requirements of actual use.

[0066] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A femoral component, comprising a femoral component (1), characterized in that, The femoral component (1) is anatomical, and its articular surface is designed with a spherical connection of multi-radius curves. The femoral component (1) includes a distal femoral side (101), a femoral condyle anterior side (102), a column (103), and a femoral condyle posterior side (105). The distal femoral side (101) has a rotational osteotomy, the femoral condyle anterior side (102) has a rotational osteotomy, the femoral condyle posterior side (105) uses a non-parallel osteotomy, a positioning groove (104) is provided on the outer wall of the column (103), one end of the column (103) is fixedly connected to the inner wall of the femoral condyle posterior side (105), the femoral condyle posterior side (105) fits with the bone cross-section, the femoral condyle anterior side (102) is designed with an anatomical asymmetry, and the outer surface of the femoral component (1) is coated with a ceramic coating.

2. The femoral component according to claim 1, wherein The posterior condylar osteotomy curved surface has a 2° angle with the column (103).

3. A femoral component according to claim 1, characterized in that, The treatment method for the ceramic coating of the femoral component (1) includes the following steps: S1. Substrate pretreatment: After cleaning, degreasing, then plasma cleaning, and finally roughening and activation to prepare for the coating; S2. Coating deposition: Depositing a ceramic coating by plasma spraying; S3. Post-treatment: Performing ultraviolet ozone cleaning after heat treatment.

4. A femoral component according to claim 2, wherein, In the S1 step, during the cleaning process, acetone is used for ultrasonic cleaning at 40 - 60 °C for 10 - 15 minutes. During the degreasing process, a sodium hydroxide solution with a mass fraction of 5% - 10% is used and soaked at 50 - 70 °C for 15 - 20 minutes. After degreasing, the surface contact angle is less than 5°.

5. A femoral component according to claim 2, characterized in that, In the S1 step, in the plasma cleaning, the gas type is selected as oxygen, the gas flow rate is 5 - 30 sccm, the power range is 50 - 300 W, the power mode is selected as continuous wave, the working pressure is 0.1 - 10 Pa, the cleaning time is 3 - 15 minutes, and the substrate temperature is controlled below 50 °C.

6. A femoral component according to claim 2, wherein, In the S1 step, for sandblasting and roughening, alumina sand with a mesh size of 100 - 120 is selected, the sandblasting pressure is 0.4 - 0.5 MPa, the surface roughness after roughening reaches Ra4 - 5 μm, and it is soaked in a dilute sulfuric acid solution with a volume fraction of 5% - 10% for 3 - 5 minutes. After activation, the surface potential is between -0.2 and -0.3 V.

7. A femoral component according to claim 2, wherein In the S2 step, the preheating temperature of the femoral component 1 is 80 - 150 °C, the powder feeding gas flow rate is 5 - 15 L / min, the gas used is argon, the main gas flow rate is 30 - 50 L / min, the power is 20 - 35 kW, the voltage is 40 - 80 V, and the current is 300 - 600 A.

8. A femoral component according to claim 2, wherein, In the S2 step, the spraying distance is controlled within 70 - 150 mm, the powder feeding rate is 10 - 30 g / min, and the spraying angle is 60° - 80°.

9. The femoral component according to claim 2, characterized in that, In the S3 step, the heating temperature is set at 550 - 750 °C, the heating rate is controlled at 8 - 15 °C / min, ensuring that the temperature deviation at each point in the furnace is within ±3 °C, the holding time is set at 2 - 4 hours, the cooling method is air cooling, and the cooling time is generally 2 - 4 hours.

10. A femoral component according to claim 2, characterized in that, In the step S3, the light source wavelength of the ultraviolet ozone cleaning is 185 nm and 254 nm dual wavelengths, the light source power range is 150 - 300 W, the average light intensity is maintained at 28 - 32 mW / cm², at a distance of 5 - 10 mm from the light source, the average light intensity reaches 30 - 35 mW / cm², the irradiation distance is controlled within the range of 10 - 30 mm, and the cleaning time is set at 15 - 30 minutes.

Images