Medical milestones, landmark publications, and notable births and deaths associated with July 20.

Events

No major medical milestones added for this date yet — this page is being expanded

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Births

1914 – Henning Moritz Ruben (1914-2004) was a Danish anaesthetist, dentist, inventor, athlete and entertainer. Innovator behind the Ruben valve, AMBU bag, a constant-rate syringe pump; a portable foot suction device; and AMBU man. Ruben was one of the first to describe (with James Elan) the head tilt method of securing a clear airway during resuscitation

1921 – Maria Magdalena Dąbska (1921-2014), Polish pathologist and oncologist; described Dąbska tumor (1969)

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Deaths

1865 – Joseph Rouanet (1797-1865), French physician; introduced his heart sounds hypothesis [S1 and S2] (1832)

1870 – Albrecht von Gräfe (1828-1870), German ophthalmologist. Father of scientific ophthalmology; first successful treatment for glaucoma via iridectomy and the design of the “Graefe knife” for cataract surgery

1888 – Paul Wilhelm Heinrich Langerhans (1847-1888) was a German physician and zoologist; described Langerhans cell (1868), and Islets of Langerhans (1869)

1936 – Charles Gilbert Chaddock (1861-1936), American neurologist, psychiatrist, poet and medical translator; described Chaddock sign (1911), and Chaddock wrist sign (1912)

1952 – Walter Arthur Bastedo (1873-1952), Canadian-American gastroenterologist; described Bastedo sign (1909) in appendicitis

2014 – Maria Magdalena Dąbska (1921-2014), Polish pathologist and oncologist; described Dąbska tumor (1969)

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Further reading