Guǎn Zhōuguì 管周桂 / Sugahara Shūkei (fl. mid-18th c., 清 / Edo Meiwa period), Japanese kanpō acupuncturist of Settsu (Chinese 攝都, modern Ōsaka). Author of the Zhēnjiǔxué gāngyào 針灸學綱要 (KR3ee040, Meiwa 3 = 1766), a kogaku 古学 (“ancient-learning”) revivalist treatise that argues for a return to LíngshūSùwèn canonical acupuncture doctrine against the post-Míng didactic-verse tradition. His distinctive technical claim is that only 70 acupoints out of the standard 361 are clinically essential. No further biographical record survives; catalog meta dynasty 清 reflects his Chinese-bibliographic reception.