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US 3,931,018 AGranted
Assembly for collection, separation and filtration of blood
AssigneeBecton, Dickinson and Company
InventorHoward North, Jr.
Life of this patent
Estimating the term…
Abstract
Devices are disclosed which are useful in the simultaneous separation and filtration of the liquid portion of clotted whole blood and anti-coagulant treated whole blood. The devices are employed in novel apparatus of the invention, for the collection, separation and filtration of blood serum and blood plasma from clotted whole blood and anti-coagulant treated whole blood, respectively.
Claims14
An assembly for the collection, separation and filtration of the liquid portion of blood, which comprises:
- a tubular container having one open end and one closed end;
- a removable closure for said open end;
- a piston component which comprises,
- a. a cylindrical flexible filter member slidably mounted in said container so as to form a sliding fit with the inner wall of said container and having a central portion and a peripheral portion;
- and
- b. a mass member having a width which is less than the diameter of said filter member, said mass member being attached to the central portion of one end of said filter member so that the periphery portion of said filter member extends radially beyond said mass member, whereby said mass does not mate with the inner walls of said container, said filter member and said mass member together having a specific gravity within the range of from about 1.03 to about 1.09.
3 more elements
An assembly for the collection, separation and filtration of the liquid portion of blood which comprises:
- a tubular container having open ends;
- a first closure sealing one of the open ends of the container and a second closure which is penetrable by a cannula sealing the other of said open ends, both of said closures being formed of self-sealing elastomeric material;
- a piston component which comprises,
- a. a flexible cylindrical filter member slidably mounted in said container so as to form a continuous sliding fit with the inner wall of said container;
- and
- b. a solid mass attached to the central portion of one end of said filter member said mass having a width which is less than the diameter of said filter member whereby said mass does not mate with the inner walls of said container;
- said filter member and said mass together having a specific gravity within the range of from about 1.03 to about 1.09;
- and
- means for preventing contact between said filter member and blood collected within said tubular container, said means being removable by a centrifugal force.
6 more elements
Dependencies are inferred from the claim text.