Abstract: The invention relates to a pressure sensor consisting of a chip (11) which is mounted on a support wall (10) and which is provided with a resistance unit consisting of strip conductors and being arranged at the lower side (13) of a substrate (12). Said lower side faces the support wall (10). The resistance unit is located on a thin membrane (18). A recess (19) is located behind said membrane. The chip (11) is fixed on the support wall (10) by means of an elastic intermediate layer (26). The electrical components of the chip are protectively arranged between the substrate (12) and the support wall (10). The invention provides for an extremely flat sensor unit without additional sensor housing. Said sensor unit can even be used for measuring pressures in electrically conductive mediums.

Abstract: The pump device comprises a first pump (10a) that may have its intake side inserted into the left ventricle (42) of the heart, while the delivery side is located in the aorta (40), and a second pump (10b) having its intake side arranged in the right atrium (43), whereas its delivery side is in the pulmonary artery (47). A common control unit drives both pumps in mutual dependance, the first pump (10a) taking the lead function, whereas the second pump (10b) pumps only about 90% of the volume flow of the first pump (10a). Pressure sensors at the pumps serve to determine the differential pressure between the intake side and the delivery side of a pump and to determine the volume flow. Both pumps are inserted into the heart without having to open the ventricles.