The Schimmelbusch mask, invented in 1890 and named for its German creator, introduced a portable, hygienic way to put someone under for surgery.
Cedars-Sinai’s Historical Conservancy maintains an extensive collection of donated artifacts such as Ingram’s bicycle horn-style breast pump, which was operated by repeatedly squeezing a rubber suction bulb.
In the early 20th century, the dye bromsulphalein was used to test liver function. A patient would be injected with the dye and then, about 30 minutes later, blood was drawn and put into a centrifuge to separate out a clear serum. The serum was mixed with a chemical solution to bring out the color of the dye, which was compared to a set of color standards.