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| Corrosion & Environmental Degradation |
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| Orthopedic
Implants
· The photograph shows the extensive use made of artificial components in restorative surgery. · The majority of the load bearing devices are metal alloys, frequently of stainless steel or titanium alloys. · In joints, lubrication and wear is an important issue for implant life. Polymers, such as very high molecular weight polyethylene, are used in the load bearing cup socket of hip, elbow, and shoulder joints. Typically these systems last about 10 years before requiring replacement - another major surgical intervention. · Electronic systems are also implanted for pacemakers, control valves, and long-term drug dispensing devices. These need to have a protective package, some with exterior access. · In long term chemotherapy, vein damage is a problem and a "port" and permanent vein catheter are employed. This is a multimaterial structure with a titanium alloy body, a silicon rubber membrane through which access to the blood system is gained, and a polymeric tube for connection to the vein. |
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| From:
M.G. Fontana,
"Corrosion Engineering," Wiley (1986) |
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