A drainage and/or collection system for biological fluids includes at least one conduit for transporting a biological fluid from a catheter to a collector device and a gas pressure source configured to feed a gas into the at least one conduit between the catheter and the collection device. The gas causes the biological fluid arranged in the at least one conduit to drain into the collection device. A method includes inserting a catheter, draining a fluid into a collector device via a conduit, and introducing gas into the conduit so as to force fluid remaining in the conduit into the collection device.
