Patent ID: 6174447
Filing Date: 2001-01-16
Classification: A61M,G01N

Abstract:
A method for fluid separation of components of blood into individual, differently-colored blood constituents comprising the following steps:placing components of blood as a mixture of liquids in a first flexible container (5);connecting the first flexible container (5) to a second flexible container (5') by an at least in part light-transparent connection (6);forcing blood constituents to flow from the first flexible container (5) through the light-transparent connection (6) into the second flexible container for a separation of concentrated thrombocytes from buffy coat;employing an optical-electrical photometer unit (10, 18), disposed in a region of the light-transparent connection (6), wherein a transmitter (10) and a receiver (18) for electromagnetic waves are disposed in the optical-electrical photometer unit, and wherein the blood constituents within the light-transparent connection past the optical-electrical photometer unit, wherein a light source is employed as the transmitter (10) of the optical-electrical photometer unit (10, 18) having a substantially monochromatic radiation of a wave length in a range either of from about 535 nm to 575 nm, or from about 400 nm to 453 nm;dimming the light source in front of the receiver for allowing essentially only parallel light beams fall onto the receiver, wherein the receiver (18) is at least one of a photo resistor and a photo diode (18) and a photo transistor tuned to the wave length;guiding the light-transparent connection (6) through a breaker unit (16);automatically deducting a signal, corresponding to inherent coloration of a plasma, from an output signal of the receiver (18) for forming a difference signal, and wherein the difference signal serves for control of the breaker unit, and wherein the breaker unit controls flow of the blood constituents and interrupts and stops the flow upon reaching of a predetermined limit value of a value of the difference signal.