Abstract: A negative pressure wound therapy system with exudate level detection through photoelectric total internal reflection, includes: a negative pressure wound therapy device; a fluid collection canister for collecting exudates, where a side wall of the fluid collection canister protrudes outward to form a protrusion, an angle ? formed by two planes where two opposite sides of the protrusion are located respectively is greater than 97.2 degrees and smaller than 180 degrees; and at least one detecting module, including: a transmitting unit arranged at one side of the protrusion; a receiving unit arranged at the other side of the protrusion; and a detection control unit, adapted to determine, according to a determination of whether the receiving unit receives the electromagnetic wave or ultrasonic wave signal transmitted by the transmitting unit, whether there exit exudates where the detecting unit is located.

Abstract: A negative pressure wound therapy system with an alarm function for the flow rate of exudate includes a liquid collecting bottle for collecting wound exudate, a negative pressure wound therapy device consisting of a negative pressure source and a controller, and a wound kit for filling and enclosing the wound, which communicates with the liquid collecting bottle via a connecting tube. The system further includes a flow rate alarm processing module and an alarm warning device. If the flow rate of exudate is greater than a predefined value, the flow rate alarm processing module issues an alarm instruction. The alarm warning device sends a warning message according to the alarm instruction.