Provided in one embodiment is a system that includes a collection reservoir coupled to a flexible tube. The system may also include a temperature sensor disposed in the flexible tube and a control system. The control system may further include a processor configured to detect an amount of a fluid flowing in the flexible tube by detecting a temperature change in the flexible tube using the temperature sensor. The system may also include a signaling device. The signaling device may be activated by the processor responsive to the processor not detecting fluid flow in the flexible tube after a predetermined amount of time. In some embodiments, the system includes a full catheter system, and in some embodiments the system includes a coupling that may be added to off-the-shelf catheters.
