…The heart has four valves (tricuspid, pulmonary, mitral, and aortic valves). When the valve structure is damaged and its function is significantly reduced, it must be repaired or, if repair is not possible, replaced with an artificial valve. The first artificial valve used in humans was invented by CA Hufnagel of the United States in 1952, and was inserted into the descending aorta of a patient with aortic regurgitation. Since then, many improvements have been made, and many artificial valves are currently in use, but they can be broadly divided into mechanical valves and biological valves. … *Some of the terminology that mentions "Hufnagel, CA" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…心臓には4個の弁(三尖弁,肺動脈弁,僧帽弁,大動脈弁)があり,弁構造がこわれてその機能が著しく低下した場合,これを修復するか,もしくは修復が不能であれば人工弁と取り替えなければならない。人工弁がはじめてヒトに使用されたのは,1952年アメリカのハフナーゲルC.A.Hufnagelが考案したもので,大動脈弁閉鎖不全症患者の下行大動脈に挿入された。以来今日まで幾多の改良が加えられ,現在多数の人工弁が使用されているが,大きく分けると機械弁と生体弁に分けられる。… ※「Hufnagel,C.A.」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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