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Like steel structures, those made from titanium have a fatigue limit that guarantees longevity in some applications. [ 17 ] The metal is a dimorphic allotrope of a hexagonal α form that changes into a body-centered cubic (lattice) β form at 882 °C (1,620 °F). [ 22 ]
Tissue heart valves are usually made from animal tissue (heterografts) mounted on a metal or polymer support. [14] Bovine (cow) tissue is most commonly used, but some are made from porcine (pig) tissue. [15] The tissue is treated to prevent rejection and calcification (where calcium builds up on the replacement valve and stops it working ...
Hormone replacement therapy (HRT), also known as menopausal hormone therapy or postmenopausal hormone therapy, is a form of hormone therapy used to treat symptoms associated with female menopause. [ 1 ] [ 2 ] Effects of menopause can include symptoms such as hot flashes , accelerated skin aging, vaginal dryness , decreased muscle mass , and ...
Heat exchangers using copper and its alloys have evolved along with heat transfer technologies over the past several hundred years. Copper condenser tubes were first used in 1769 for steam engines. Initially, the tubes were made of unalloyed copper. By 1870, Muntz metal, a 60% Cu-40% Zn brass alloy, was used for condensers in seawater cooling.
UHMWPE has a clinical history as a biomaterial for use in hip, knee, and (since the 1980s), for spine implants. [1] An online repository of information and review articles related to medical grade UHMWPE, known as the UHMWPE Lexicon, was started online in 2000. [24] Joint replacement components have historically been made from "GUR" resins.
Sir John Charnley, CBE, FRS [1] (29 August 1911 – 5 August 1982) was an English orthopaedic surgeon.He pioneered the hip replacement operation, [4] which is now one of the most common operations both in the UK and elsewhere in the world, and created the "Wrightington centre for hip surgery".
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