Patent ID: 8349189

Claim:
Method for the preparation of at least one compound from blood, characterised in that it comprises the following steps: i) providing blood in a first sealed container with a pressure below atmospheric pressure; ii) separating the blood into at least the following fractions: a fraction of red blood cells in the bottom part of the first container, a fraction of white blood cells and platelets above the preceding one and, above, a plasma fraction with a platelet gradient concentration, said gradient decreasing towards the top part of the first container; iii) inserting an extraction device substantially up to the top level of the highest fraction contained in the first container; iv) performing, at least once, the steps of connecting a second container that is vacuum-sealed and has a pressure below that of the first container to the extraction device; waiting for a certain period of time until a required amount of plasma, white blood cells and platelets and/or red blood cells is/are transferred, as a result of the difference in pressures, to the second container; removing the second container; and, in the event of further extractions being performed, adjusting the degree to which the extraction device is introduced so that it once again reaches the top level of the remaining fractions.