Patent ID: 8801684

Claim:
A coupling part of a drainage tube unit for aspirating body fluids by means of a suction pump, comprising: a patient-side drainage attachment, a pump-side drainage orifice for connection to a drainage tube, and a drainage channel connecting the drainage attachment and the drainage orifice to each other; a pump-side first service orifice for connection to a service tube, a second service orifice ending in the interior of the coupling part, and a service channel connecting these first and second service orifices; and a device which separates the service channel from the drainage channel, wherein the device permits delivery of fluid from the service channel into the drainage channel and prevents delivery of particles and liquid from the drainage channel into the service channel; wherein the device is arranged in the coupling part at a location that allows a flow through the drainage channel from the drainage attachment to the drainage orifice without passage through the device; wherein the pump-side drainage orifice and the pump-side service orifice extend parallel to each other and wherein the device is a membrane, the membrane acting as a filter and/or as a nonreturn valve.