Method and separation device for separating a filtrate from a sample fluid

• Main Author: HUEMER HERFRIED
• Format: Patent
• Language: English
• Published: 15.04.2015
• Subjects: CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PHYSICS; SEPARATION; TESTING; TRANSPORTING

The invention relates to a separation device for separating a filtrate from a sample fluid, especially for extracting plasma (42) from whole blood (41), comprising a sample container (25) for receiving the sample fluid and a filter plunger (26) to be introduced under seal into the sample container (25), which filter plunger has a filter element (24) at its front end and a grip element (27) on the opposite end and will receive in its interior the filtrate obtained. After insertion of the filter plunger (26) into the sample container (25) an annular chamber (34) is formed between the inner wall of the sample container (25) and the outer wall of the filter plunger (26), which is sealed against the exterior by a sealing lip (32) and in which an air cushion is formed upon introduction of the filter plunger (26) into the sample container (25), which acts on the sample fluid. A flow connection is provided between the annular chamber (34) and the front side of the filter element (24) after insertion of the filter plunger (26) is terminated.