Patent ID: 7323144

Claim:
An apparatus for separating a biological sample, comprising: a blood-collecting container for receiving collected blood; a diluent solution in an amount sufficient to dilute 1-2 drops of collected blood contained in said blood-collecting container; a filtration film through which plasmas or serums within the collected blood can pass while the passage of blood cells are blocked; a cylindrical body fittable into said blood-collecting container and capable of receiving the plasmas or serums that are passed through said filtration film; and a sealing cap for closing a flow path between said cylindrical body and said blood-collecting container for preventing the plasmas or serums received in the cylindrical body from flowing backward into said blood-collecting container through said filtration film once the blood is collected in said blood-collecting container and said cylindrical body is fitted into said blood-collecting container, and after the plasmas or serums within said blood are passed through said filtration film, whereby the blood cells and the plasmas or serums are separately received in said blood-collecting container and said cylindrical body respectively, wherein said blood-collecting container has a screw part provided at an upper end part of said container, said filtration film is provided at a lower end part of said cylindrical body, said cylindrical body has a cap piston crowned thereon, said cap piston is provided with a grip part that can be threaded into said screw part and a stem part extending from said grip part into said cylindrical body, and said sealing cap is provided at a lower end of said stem part; and wherein once the blood is collected in said blood-collecting container and said cylindrical body is fitted into said blood-collecting container followed by threading said grip part into said screw part, and after the plasmas or serums within said blood are passed through said filtration film, then said sealing cap closes the lower end part of said cylindrical body to prevent the reverse flow of said plasmas or serums, and the plasmas or serums and the blood cells are separately received in said cylindrical body and said blood-collecting container respectively.