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C ORROSION OF S URGICAL I MPLANTS University of Technology Materials Eng. Department Biomaterials And Biomedical Engineering.

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Presentation on theme: "C ORROSION OF S URGICAL I MPLANTS University of Technology Materials Eng. Department Biomaterials And Biomedical Engineering."— Presentation transcript:

1 C ORROSION OF S URGICAL I MPLANTS University of Technology Materials Eng. Department Biomaterials And Biomedical Engineering

2 Biological Environment

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4 Tissue–implant corrosion Cells adhering to the surface of a metallic biomaterial Influences of the presence of fibroblasts on the corrosion of metallic biomaterials M M n+ + ne O 2 + 4e + 2H 2 O 4OHˉ M M n+ + ne O 2 + 4e + 2H 2 O 4OHˉ

5 Generalized fibrous capsule forming in response to intramuscularly implanted metal. The metal dissolves in body over time rendering removal surgery

6 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 Capsule formation around a polydimethylsiloxane implant.

7 Peri-implant tissue and immune cell reacting of implant debris

8 Diagram 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. Potentiodynamic polarization

9 Material: 304 SS, Cobalt based alloy Implant location: Orthopedic/ Dental alloy Material: 316 L stainless steel Implant location: Bone plates and screws Material: 304SS/316SS, CoCr +Ti6Al4V, 316SS/Ti6Al4V Or CoCrMo Implant location: Oral implants, Screws and nuts Material: 316 SS, CoCrNiFe Implant location: Bone cement Material: Ti6Al4V, CoCr, SS Implant location: Ball Joints

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11 Cardiovascular Implants Artificial heart. Corrosion of stent in bare metal.

12 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. 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.

13 Ion implantation

14 Hydroxyapatite coatings

15 Laser nitriding

16 Hard coatings for orthopaedic implants

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