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  2. Nelson River DC Transmission System - Wikipedia

    en.wikipedia.org/wiki/Nelson_River_DC...

    When it was built between March 1971 and October 1977, mercury-arc valves were used to rectify the alternating current. These valves, supplied by English Electric, [7] each had six anode columns in parallel and were the most powerful mercury arc valves ever built. Each of them had a weight of 10,200 kg (22,500 lb), a length of 4.57 metres (15.0 ...

  3. Aortic valve replacement - Wikipedia

    en.wikipedia.org/wiki/Aortic_valve_replacement

    Aortic valve replacement is a cardiac surgery procedure whereby a failing aortic valve is replaced with an artificial heart valve. The aortic valve may need to be replaced because of aortic regurgitation (back flow), or if the valve is narrowed by stenosis .

  4. Björk–Shiley valve - Wikipedia

    en.wikipedia.org/wiki/Björk–Shiley_valve

    Björk–Shiley valve, as depicted in patent #US003824629. The Björk–Shiley valve is a mechanical artificial heart valve. The valve was co-invented by American engineer Donald Shiley and Swedish heart surgeon Viking Björk. Beginning in 1971, it has been used to replace aortic valves and mitral valves. It was the first successful tilting ...

  5. Transcatheter aortic valve replacement - Wikipedia

    en.wikipedia.org/wiki/Transcatheter_aortic_valve...

    Transcatheter aortic valve replacement (TAVR) is the implantation of the aortic valve of the heart through the blood vessels without actual removal of the native valve (as opposed to the aortic valve replacement by open heart surgery, surgical aortic valve replacement, AVR).

  6. Bentall procedure - Wikipedia

    en.wikipedia.org/wiki/Bentall_procedure

    The Bentall procedure is a type of cardiac surgery involving composite graft replacement of the aortic valve, aortic root, and ascending aorta, with re-implantation of the coronary arteries into the graft. This operation is used to treat combined disease of the aortic valve and ascending aorta, including lesions associated with Marfan syndrome.

  7. Artificial heart valve - Wikipedia

    en.wikipedia.org/wiki/Artificial_heart_valve

    The repairing process of the artificial heart valve regurgitation and stenosis usually requires an open-heart surgery, and a repair or partial replacement of regurgitant valves is usually preferred. [24] Researchers are investigating catheter-based surgery that allows repair of an artificial heart valve without large incisions. [33]

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