It looks like something cobbled together from old washing machine parts.
From Morris Fishbein, M.D. (Editor). The New Illustrated Medical and Health Encyclopedia. New York, NY: H.S. Stuttman Co., Inc. 1970.
Since this encyclopedia included material from the Modern Home Medical Adviser going back to 1935, these photos may be earlier than 1970. Still, we've clearly come a long way. For one thing, nurses no longer have to wear goofy hats.