Patent ID: 9333281
Filing Date: 2016-05-10
CPC Classification: A61M,G01F

Claim Text:
1. A drainage pump unit for aspirating body fluids by means of a suction pump, comprising: a suction pump housing comprising a wall with an inner face and an outer face, a suction pump being arranged in the suction pump housing, a fluid collection container being configured to be secured releasably on the suction pump housing, a capacitive filling level sensor being arranged on the suction pump housing for detecting a filling level in the fluid collection container without contacting the fluid in the fluid collection container, with at least two electrodes and a microprocessor, wherein a first of the at least two electrodes is in one piece, and at least a second of the at least two electrodes is segmented, and wherein the one-piece first electrode comprises a transmitter electrode and the segmented second electrode comprises a receiver electrode, and a modulator configured to apply an excitation signal to the one-piece first electrode, wherein the outer face of the wall of the suction pump housing faces towards the fluid collection container in an intended position of use, wherein the at least two electrodes and the microprocessor are arranged on a single printed circuit board, wherein the at least two electrodes are arranged at a distance from each other and extend along a common path, and wherein the printed circuit board is arranged on the inner face of the wall of the suction pump housing, such that the wall of the suction pump housing lies between the at least two electrodes and the fluid collection container in an intended position of use.