Ralph M. Waters

Ralph Milton Waters (1883 - 1979)

Ralph Milton Waters (1883 – 1979) was an American anesthesiologist.

Waters is best known as the founder of the first academic program in anesthesiology, at the University of Wisconsin

  • Born on October 9, 1883 North Bloomfield, Ohio
  • 1945 – President of the American Society of Anesthesiologists (ASA)
  • Died on December19, 1979

Medical Eponyms
Waters To-and-Fro Carbon Dioxide Absorption Canister (1923)

Guedel-Waters Cuffed intratracheal tube (1928)
Guedel-Waters Cuffed intratracheal tube (1928)
Guedel-Waters Cuffed intratracheal tube (1928)

The catheter effectively prevents all air leaks and renders the respiratory system entirely closed, with a controllable to and fro respiratory exchange. Aspiration of foreign matter into the lungs is not possible with the catheter in place.

Guedel, Waters 1928

Waters Airway (1930)

The Waters Airway (OPA) has a side port or “nipple” to deliver air or oxygen via tubing. Designed as a metal airway to prevent patients from accidentally biting on the airway and occluding gas flow.

Waters Airway OPA Ralph M Waters
Ralph M Waters Airway OPA modified

Major Publications


Dr Rowan Lo LITFL AUthor

Emergency Medicine Registrar at Sir Charles Gairdner Hospital. BM BS, BMed Sci, MMed Sci from the University of Southampton.

Enjoying life in Australia currently with the view to returning to the UK to train in Anaesthetics and Intensive Care Medicine.

BA MA (Oxon) MBChB (Edin) FACEM FFSEM. Emergency physician, Sir Charles Gairdner Hospital.  Passion for rugby; medical history; medical education; and asynchronous learning #FOAMed evangelist. Co-founder and CTO of Life in the Fast lane | Eponyms | Books | Twitter |

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