US Patent 10384001 Fluid flow device

One example discloses a fluid flow device, including: a drop chamber, having an interior, a fluid input, and a fluid output; a drop detector coupled to the drop chamber and configured to detect a fluid drop at the fluid input; a pressure sensor configured to monitor a pressure in the interior of the drop chamber; and a flow rate device configured to determine a fluid flow rate based on a number of fluid drops detected over a time period, and the pressure in the interior of the drop chamber.