A stromuhr (literally:

German German(s) may refer to: * Germany (of or related to) **Germania (historical use) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizens of Germany, see also German nationality law **Ger ...

for ''stream clock'') was a medical instrument designed by

Carl Ludwig Carl Friedrich Wilhelm Ludwig (; 29 December 1816 – 23 April 1895) was a German physician and physiologist. His work as both a researcher and teacher had a major influence on the understanding, methods and apparatus used in almost all branches ...

in 1867 to measure the strength of flow in major arteries and veins by means of animal experiments. For this purpose, the arteries were cut across and the stromuhr was attached between the proximal and distal stumps. The stromuhr had to be filled with the whole blood of the test animal or with a blood substitute solution beforehand.

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Image of a Stromuhr
Cardiology Medical testing equipment German inventions {{medical-equipment-stub