Official Answer
Answer
Elgiloy is chosen for medical implants (like heart valves or orthopedic devices) due to its extreme biocompatibility, high fatigue resistance, and non-magnetic properties. It exhibits excellent corrosion resistance in chloride-rich body fluids. From a processing standpoint, Elgiloy can be cold-worked and then aged to achieve very high strength levels. For a spiral ring, this means the ring can be made very thin (reducing the implant's profile) while still providing the necessary retention force. Its high fatigue endurance limit is critical for devices that must function for billions of cycles (e.g., a heart valve beating $100,000$ times a day).
