1. A device for vacuum treatment of wounds, including: (a) coating material for airtight closure of the wound area, (b) optionally, a means for connecting a vacuum source and (c) open-cell polyurethane foam as a wound dressing obtained by the reaction of a mixture containing components : (i) polyisocyanate, (ii) polyester polyol, (iii) blowing agent and (iv) catalyst, wherein the open-cell foam after storage for three days in cattle serum has a tensile strength, measured according to DIN 53571, from 80 kPa to 300 kPa, and polyester polyol (ii) is obtained by reacting a dicarboxylic acid containing 4-8 carbon atoms with a dihydric alcohol with 2-6 carbon atoms. 2. The device according to claim 1, where the open-cell polyurethane foam has tensile strength after storage for three days in cattle serum, measured according to DIN 53571, from 150 kPa to 220 kPa. A device according to one of the preceding claims, wherein the polyisocyanate (i) is selected from MDI, PMDI and / or TDI. 4. The device according to claim 1, where the complex polyester polyol (ii) has a weight average molecular weight of from 500 to 4000 g / mol. The device according to claim 4, where the open-cell polyurethane foam has an ultimate elongation, measured according to DIN 53571, from 250% to 650% .6. The device according to claim 1, where the open-cell polyurethane foam has an air permeability, measured according to DIN EN ISO 9237, from 1000 to 8000 l / (m · s). The device according to claim 1, where the open-cell polyurethane foam has an apparent density, measured according to DIN EN ISO 845, from 15 to 30 kg / m. The device according to claim 1, wherein the open-cell polyurethane foam has an aromatic content of 5 to 50%. The device according to claim 1, where the polyurethane foam with open1. Устройство для вакуумной терапии ран, включающее:(a) покрывной материал для воздухонепроницаемого закрывания зоны раны,(b) возможно, средство для подключения источника вакуума и(c) пенополиуретан с открытыми
