Abstract: A reprocessing apparatus for cleaning and/or disinfecting a medical instrument including a fluid container for a reprocessing fluid and a reprocessing device. The reprocessing device includes: a reprocessing space in which the medical instrument is introduced for reprocessing; a fluid line for connection to at least one channel of the medical instrument, wherein the fluid line is configured to transport the reprocessing fluid to the at least one channel; a bubble introducing apparatus for introducing gas bubbles into the fluid line; and a gas bubble speed determining apparatus for determining a speed of the gas bubbles in the fluid line. The gas bubble speed determining apparatus includes a camera for capturing successive images of at least a portion of the gas bubbles in the fluid line.

Abstract: A method for operating a reprocessing apparatus for cleaning and/or disinfecting a medical instrument which has at least one channel, wherein a fluid line is provided for connection to the at least one channel, the method including: introducing gas bubbles into a liquid flowing in the fluid line, determining a speed of the gas bubbles flowing in the fluid line; and extrapolating a volume flow of the liquid flowing in the fluid line on the basis of the determined speed of the gas bubbles.