Patent ID: 7507578
Filing Date: 2009-03-24
Classification: B01D,G01N

Abstract:
1. A biological specimen filter device, comprising: a tubular body having first and second axially disposed ends and an interior region comprising a vacuum cavity, the first end comprising a planar annular mounting surface disposed substantially orthogonal to a longitudinal axis of the tubular body, the mounting surface having an annular ridge extending therefrom away from the tubular body and surrounding an aperture in a central region of the first end, the aperture in fluid communication with, and having a smaller diameter than, the vacuum cavity; and a filter membrane having a peripheral region affixed to the mounting surface, and a central region that spans across the aperture, wherein a surface of the central region facing away from the tubular body is raised away from the peripheral region by the ridge and configured to contact a planar sample transfer surface without the transfer surface contacting the peripheral region of the filter.