Suspension device of a drainage container

A suspension device for a drainage container that is used to collect aspirated body fluid, wherein the suspension device has, on a first side, a first fastening unit for mounting and fastening the drainage container on the suspension device, and wherein the suspension device has, on a second side, a second fastening unit for mounting and fastening the suspension device on a rail, wherein the first fastening unit is arranged in a first fastening part, and the second fastening unit is arranged in a second fastening part, and wherein the suspension device comprises a weighing part with a weighing element, wherein the weighing part is connectable to the first fastening part and to the second fastening part so as to measure, with the weighing element, a relative displacement between the first fastening part and the second fastening part, such that a filling quantity of the aspirated body fluid in the drainage container can be determined.