Presentation on theme: "Corrosion of Surgical Implants"— Presentation transcript:
1Corrosion of Surgical Implants University of TechnologyMaterials Eng. DepartmentBiomaterials And Biomedical EngineeringCorrosion of Surgical Implants
2Biological Environment Corrosion is one of the major processes that cause problems when metals and alloys are used as implants in the body.Corrosion is the interaction between material and its environmentBiological Environment
4Tissue–implant corrosion The interactions between the material and the tissues are of prime importance. Such interactions induce corrosion/ionization of the implanted device.Corrosion can have two effects.First the implant may weaken and the premature failure will result. The second effect is the tissue reaction leading to the release of corrosion products from the implant.Cells adhering to the surfaceof a metallic biomaterialM → Mn+ + neO2 + 4e + 2H2O → 4OHˉInfluences of the presence offibroblasts on the corrosionof metallic biomaterials
5Generalized fibrous capsule forming in response to intramuscularly implanted metal.The metal dissolves in body over time rendering removal surgery
6Capsule formation around a polydimethylsiloxane implant. Cells in the periprosthesis tissues in the ankle. Counterstained with hematoxylin. (A): Macrophages (arrowheads) facing necrotic masses (N).(B): Heavy macrophage infiltration in the implant capsule. (C): bone debris (B) surrounded with macrophages. (D): multinuclear foreign body giant cells (empty arrows) in the implant capsule
7Peri-implant tissue and immune cell reacting of implant debris
8Diagram of the percentage of the uncorroded implant at various time Infrared microscope spectra of tissue with (red line) and without (blue line) corrosion products. The absorption bands, which are caused by the corrosion products, are marked with arrows.Diagram of the percentage of the uncorroded implant at various timePotentiodynamic polarization
9Material: 304 SS, Cobalt based alloy Implant location: Orthopedic/ Dental alloyMaterial: 316 L stainless steelImplant location: Bone plates and screwsMaterial: 316 SS, CoCrNiFeImplant location: Bone cementMaterial: 304SS/316SS,CoCr +Ti6Al4V,316SS/Ti6Al4V Or CoCrMoImplant location: Oral implants,Screws and nutsMaterial: Ti6Al4V, CoCr, SSImplant location: Ball Joints
11Corrosion of stent in bare metal. Corrosion Various ImplantsCardiovascular ImplantsArtificial heart.CorrodedstentsCorrosion of stent in bare metal.
12Corrosion protection Surface modification There is a number of methods, which treat the surface of a metal or alloy to provide protection against corrosion like:Biomimetic Processing.Electrophoretic Deposition (EPD).Glow discharge nitriding.Ion implantation.Thermal spraying.PVD treatments.Laser treatment.