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Showing 1 to 20 of 21 for “"CoCrMo"”.
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The corrosion of CoCrMo alloys for biomedical applications
CoCrMo alloys have been used for biomedical implants for a number of years. They are now frequently used for the metal-on-metal hip resurfacing joints due to their high corrosion and wear performance. The present project was carried out to investigate the feasibility of taking electrochemical …
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Abrasion-corrosion of cast CoCrMo in simulated hip joint environments
… and tribo-corrosion performance of a cast CoCrMo (F75) in simulated hip joint environments. The effects of third body particles have been studied in the MoM context using 4 ?m SiC, 1 ?m and 300 nm Al2O3, as well as sub-micron BaSO4. Modified tribo-testers (micro-abrasion, …
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Fabrication and characterisation of Cobalt Chromium Molybdenum (CoCrMo) foams using slurry method
Cobalt Chromium Molybdenum (CoCrMo) is a metal foams that are widely used in the biomedical field of orthopedic applications. This research is intended to produce CoCrMo foam by using slurry method and to perform optimization on processing parameters slurry method in CoCrMo foam preparation by the …
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Wear and Corrosion Resistance Improvement of CoCrMo alloy by Tantalum Based Coatings
… short lifetime of the prosthesis. Medical grade CoCrMo alloy is one of the most common materials used for femoral head fabrication. Unfortunately, the implant fails usually after 15 years of service due to the excessive wear of the polyethylene liner and corrosion of the metallic ball which …
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The effects of simulated inflammatory conditions on the corrosion and fretting corrosion of CoCrMo alloy
<p>In vivo corrosion of CoCrMo alloy and its potential adverse effects on the body have been recognized as major concerns in recent years. While the underlying concepts of general and mechanically-assisted corrosion have been well documented, recent report of inflammatory cell-induced corrosion …
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Cellular Corrosion of CoCrMo Total Knee Implants: Understanding Underlying Mechanisms Through Retrieval Analysis and Simulated Inflammatory Conditions
… board approval, 41 Cobalt-Chromium-Molybdenum (CoCrMo) cadaveric primary total knee arthroplasty specimens were collected. After removal and cleaning, light microscopy was utilized to identify areas of ICIC-like damage scares. CoCrMo, zirconium nitride (ZrN)coated, and Oxinium knee implants were …
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The Effects of Synovial Fluid and Inflammatory Cells on Orthopaedic Implant Alloys
… consist of a Cobalt Chromium Molybdenum (CoCrMo) femoral component and a Titanium Aluminum Vanadium (TiAlV) alloy baseplate. These metal alloys are chosen for their mechanical properties, corrosion resistance, high affinity for bone, and biocompatibility. However, they can be susceptible …
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Investigating Synovial Fluid Electrochemical Properties Against Orthopaedic Alloys
<p>Introduction. Cobalt-chromium-molybdenum (CoCrMo) femoral components are widely used in total knee arthroplasty (TKA). However, recent retrospective clinical trials associate moderate adverse local tissue reactions (ALTRs) with CoCrMo release in the knee. Additionally, gaps persist in our …
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Additive manufacturing of stiffness optimised auxetic bone scaffold using cobalt-chromium-molybdenum superalloy
… stiffness matching to a tibia host section. CoCrMo has been chosen as the biomaterial of choice due to its high elastic modulus and density which offered the potential for conceiving highly porous architectures. CoCrMo stiffness matched auxetic bone scaffolds optimised under two scenarios for …
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The adoption of laser melting technology for the manufacture of functionally graded cobalt chrome alloy femoral stems
… and lightweight cobalt chromium molybdenum (CoCrMo) femoral stems that can be manufactured using Selective Laser Melting (SLM). Square pore cellular structures with compressive properties that are similar to human bone have been presented and incorporated into femoral stems by utilising fully …
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Tření a mazání biomateriálů s modifikací povrchu pro kloubní implantáty
… tření, mazání a opotřebení u biomateriálů CoCrMo a Ti6Al4V. Byly provedeny reciproční třecí testy v konfiguraci pin-on-plate a analýza topografie povrchů. U vybraných dvojic byl sledován také vývoj tloušťky mazacího filmu pomocí fluorescenční mikroskopie a opotřebení při dlouhodobých …
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The Impact of Local Physiology on the Corrosion of Orthopedic Alloys
… is as low as 80%. Cobalt-chromium-molybdenum (CoCrMo) is regularly used for TKA protheses due to the alloy’s mechanical strength, biocompatibility, and corrosion resistance. The corrosion resistance of this alloy relies on a passive oxide layer. This oxide layer can be impacted by phagocytic …
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Voltage Effects on Cells Cultured On Metallic Biomedical Implants
… work, changes in the interfacial properties of a CoCrMo biomedical alloy (ASTM F-1537) in phosphate-buffered saline (PBS) (pH 7.4) at different voltages was studied. Step polarization impedance spectroscopy technique was used to apply 50 mV voltage steps to samples, and the time-based current …
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Synthesis and Characterization of Ag and Cu doped DLC Thin Films for Anti-microbial Applications
… thin films were deposited on biomedical grade CoCrMo alloy discs using DC magnetron sputtering. The concentrations of Ag and Cu in the DLC matrix were controlled by varying the pulsed DC power to the Ag and Cu targets. The films' chemical composition, morphology, and bonding states of the films …
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Design, Material and Surgical Assembly Effects on Fretting Corrosion Behavior of Modular Tapers in Orthopedic Implants
… pull-off load were monitored in 12/14 Ti6Al4V/CoCrMo modular taper junctions. The seating behavior for four load magnitudes, three load orientations and five contamination groups was reported. The results showed an increase in seating load magnitude increased seating displacement, work of …
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Manipulated Electrochemical Surface Reactions Induced By Oscillatory Electric Potentials on Metal Based Electrodes
… to the complex corrosion of implanted ASTM F1537 CoCrMo.Although electrochemistry has been a driving force of many modern technologic advancements and the fundamental relations of electrochemistry have existed for over 100 years, current techniques do not adequately address the possibility for …
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Iatrogenic Electrocautery Damage and Cellular-Based Corrosion of Total Joint Arthroplasty Biomaterials
… functional deficit. Cobalt-Chromium-Molybdenum (CoCrMo) alloy is one of the most used materials in Total Joint Arthroplasty (TJA) implants due the material’s high strength, high corrosion resistance, and biocompatibility. The release of metal ions and potential occurrence of metallosis in TJA has …
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Tribological and Structural Characterisation of Ceramic on Metal Hip Replacements
… alumina (ZTA)), were articulated against as-cast CoCrMo alloy cups. The diameter was changed from 38 mm to 60 mm to explore the effect of diameter on the tribological performance. Three distinct wear tests were undertaken to allow a direct comparison between materials and sizes. These were; wear …
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Novel Methods and Self-Reinforced Composite Materials for Assessment and Prevention of Fretting Corrosion in Modular Tapers
… of these SRC materials to effectively insulate CoCrMo/Ti6Al4V alloy interfaces during cyclic fretting motion at contact stresses similar to those that might be experienced in modular taper junctions. SRC-PEEK and SRC-PE reduced fretting currents by approximately two orders of magnitude as …
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