US 4,789,473 AGranted

Filter for obtaining plasma or plasma water

AssigneeFresenius AG

InventorsBernd Mathieu, Wolfram Weber, Wolfgang Schulz

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Abstract

A filter comprising a filter housing with an interior within which between two closure members filter membranes in the form of hollow fibers are disposed. Between the hollow fibers a free flow space remains to which are connected two connecting pieces disposed inclined on the housing. Through said connecting pieces blood is supplied to the interior so that a filtration from the outside to the inside into the hollow fibers is possible. This and the arrangement of the connecting pieces gives an extremely favourable flow approach to the hollow fibers so that the blood flow is hardly influenced in its velocity and flow behaviour because in addition to the cross-section of the free flow space is adapted to the cross section of the blood supply line. For making such a filter at least two filters are arranged parallel and spaced apart in a plane, the support surface for the filters being rotatably mounted and the axis of rotation not intersecting any of the two longitudinal axes of the filters. During the rotation and supplying of the casting or sealing compound for the closure members through end-face supply means into the interior inclined faces are formed which in their angle correspond to the angle (.alpha., .beta.) of the connecting pieces.

Claims3

Dependent claims

A hollow fiber filter for obtaining plasma or plasma water, comprising:

(a) a hollow, tubular housing having an interior chamber, a longitudinal axis and open ends;
(b) a plurality of elongated hollow fibers, disposed within said housing and being substantially parallel to said longitudinal axis of said housing and extending the length of said housing;
(c) two casting compound members disposed within said open ends of said housing, effectively sealing both ends of said housing, while permitting the passage of said hollow fibers therethrough, thereby defining a free flow space within said housing, said free flow space having a cross-sectional area equal to the cross-sectional area of said interior chamber less the combined cross-sectional area of said hollow fibers, and said casting compound members each having a planar face adjacent to said free flow space, said planar face being disposed in a plane non-perpendicular to said longitudinal axis of said housing;
(d) at least two hollow fluid flow connectors, each having a longitudinal axis, said fluid flow connectors sealingly affixed to, and forming an intersection with said housing in close proximity to said casting compound members and in flow communication with said free flow space, said connectors being disposed in a manner in which said longitudinal axis of each fluid flow connector forms an acute angle with respect to said longitudinal axis of said housing, the cross-sectional area of said housing being approximately equal to the cross-sectional area of said free flow space, forming means to improve fluid flow through said connectors and housing, and reducing turbulent or stagnant flow characteristics;
and
(e) at least one plasma outlet, said outlet being connected to, and in communication with said hollow fibers external to said casting compound members and said free flow space.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/001,815Filed 8 Jan 1987
Priority: DE 360052710 Jan 1986
Granted: 6 Dec 1988
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

B01D 63/0222
Encapsulating hollow fibres: using centrifugal forces
B01D 63/02
Apparatus in general for separation processes using semi-permeable membranes: hollow fibre modules
B29C 41/045
By rotating a mould around its axis of symmetry: the axis being placed vertically, e.g. spin casting
B29C 70/845
By moulding material on preformed parts to be joined: by moulding material on a relative small portion of the preformed parts