Hanaoka Seishū

Japanese surgeon and pioneer of anesthesia

Hanaoka Seishū ( , October 23, 1760 – October 21, 1835) was a Japanese surgeon of the Edo period who is celebrated for his pioneering work in the field of anesthesia. He is best known for being the first person to perform surgery using general anesthesia, which he achieved using a herbal formula he developed called tsūsensan.

Early Life and Education

Hanaoka Seishū was born in Kii Province, Japan, in 1760. He was the eldest son of a physician, and from a young age, he was exposed to the practice of medicine. His early education was in the traditional Japanese medical practices, but he later studied Chinese medicine and Western medicine, which were becoming increasingly influential in Japan at the time.

Medical Career

Hanaoka's medical career was marked by his innovative approach to surgery and anesthesia. He was particularly interested in the use of herbal medicine to alleviate pain during surgical procedures. This interest led him to study the properties of various plants, including Datura stramonium.

Datura stramonium, one of the plants used in Hanaoka's anesthetic formula

Development of Tsūsensan

Hanaoka's most significant contribution to medicine was the development of tsūsensan, an herbal anesthetic formula. This formula was a combination of several herbs, including Datura stramonium, which contains tropane alkaloids known for their sedative properties. Hanaoka's formula allowed him to perform surgeries that were previously impossible due to the pain involved.

Surgical Achievements

In 1804, Hanaoka performed the first documented surgery using general anesthesia. The patient was a woman named Kan Aiya, who had a breast tumor. The successful removal of the tumor marked a significant milestone in the history of surgery.

Image from Hanaoka Seishū's surgical casebook

Legacy

Hanaoka Seishū's work laid the foundation for the development of modern anesthesia. His innovative use of herbal medicine to induce anesthesia was a precursor to the chemical anesthetics used today. Hanaoka's techniques and teachings were passed down through his students, influencing the practice of surgery in Japan and beyond.

Influence and Recognition

Hanaoka's contributions to medicine have been recognized both in Japan and internationally. He is often compared to Hua Tuo, an ancient Chinese physician known for his surgical innovations.

Hua Tuo, an ancient Chinese physician

Related Pages

• Anesthesia
• History of surgery
• Edo period
• Japanese medicine