Yú Tuán 虞摶 (zì Tiānmín 天民, hào Huāxī Héngdé lǎorén 花溪恆德老人, 1438–1517), native of Yìwū 義烏 (Zhèjiāng) — the same county as Zhū Dānxī 朱震亨, with whom Yú’s family had a direct medical-pedagogical line. Yú’s great-grandfather had studied under Zhū Dānxī personally; through his father he inherited the Dānxī yīxué tradition in its fourth generation.
Originally a jǔzǐ candidate, Yú is reported to have given up his examination preparation after his mother fell ill and the family’s physicians failed her, devoting himself thereafter to medical study — the canonical JīnYuán biographical pattern. He read widely beyond the Dānxī corpus: Sù wèn, Nán jīng, Zhāng Zhòngjǐng, Sūn Sīmiǎo, Qián Yǐ, Lǐ Gǎo, and the SòngYuán formularies. His own clinical practice integrated all these traditions, with Dānxī yīn-nourishing as the doctrinal centre but with explicit acknowledgement that no single school sufficed: “Dānxī’s books simply set forth what the predecessors had not set forth and supplemented what they had not supplied. If one does not draw together the writings of the various worthies and synthesise them, how can one speak of medicine accomplished?”
His principal works are the Yīxué zhèngchuán 醫學正傳 (KR3eh006, 8 juǎn, completed 1515 when Yú was 78, first printed 1531) and the Fāngmài fāméng 方脈發蒙 (6 juǎn). The Zhèngchuán in particular is one of the most widely cited mid-Míng synthetic medical works and was used as a source by Lǐ Shízhēn 李時珍 in the Běncǎo gāngmù.
The catalog meta records the surname-character as 虞傳 (a typographical slip for 虞摶 — the huái 摶 with the shǒu radical, not the yán of 傳). The standard form is 虞摶.