Back to results
US 4,092,246 AGranted
Helically wound blood filter
AssigneeAbcor, Inc.
InventorFrederick J. Kummer
Life of this patent
Estimating the term…
Abstract
A filter for the filtration of blood characterized by a high flow rate with low pressure drop, which filter comprises: a filter housing; an inlet in the housing for the introduction of the blood to be filtered; an outlet in the housing for the removal of filtered blood; and a filter element disposed within the housing, which element comprises a helically coiled strip of sheet material containing a surface layer of fibrous flocked material on at least one side thereof, the sheet material wound into a helical coil of desired tightness, and the flocked material selected to remove particles from the blood to be filtered.
Claims39
A filter for a fluid stream which comprises in combination:
- (a) a filter housing adapted to contain a filter element;
- (b) a filter element disposed in the housing having an upstream end and a downstream end, and which element comprises a helically coiled strip of sheet material containing, on at least one surface thereof, a surface layer of fibrous flocked material, the sheet material wound into a helical coil of desired tightness within the housing, so as to prevent a multitude of channels through the flocked material to the fluid stream which passes axially through the coiled strip, the flocked material selected to remove particles from the fluid stream to be filtered, the helically coiled strip being wound such that an increasing gradient in the tightness of the wind from the upstream to the downstream ends provides for both gradient and depth filtration of the blood;
- (c) an inlet for the introduction of a fluid stream to be filtered into the housing;
- and
- (d) an outlet for removal of the filtered fluid stream from the housing.
2 more elements
A filter for the filtration of blood, which filter comprises in combination:
- (a) a filter housing composed of upper and lower filter elements to form a filter housing in which a centrally disposed inlet for the introduction of blood to be filtered and a centrally disposed outlet for the removal of filtered blood;
- (b) a filter element disposed within the housing, and which filter element comprises a core element and wound about the core element a helically coiled strip of polymeric sheet material having adhesively secured to at least one surface thereof a fibrous flocked polymeric material having a fiber length of less than 5 mm, the sheet material wound into a helical coil of desired tightness so as to fit snugly within the filter housing, the helical coil disposed and axially aligned with the inlet and outlet of the housing to permit the passage of blood to be filtered by axial passage therethrough, the helically coiled strip being wound such that an increasing gradient in the tightness of the wind from the upstream to the downstream ends provides for both gradient and depth filtration of the blood;
- (c) a filter means upstream of the filter element to prefilter the blood, the filter means having pores of about 50 to 200 microns;
- (d) a flow distributor means upstream of the filter element and disposed to equalize the flow of the blood introduced into the inlet across the cross-section of the filter element;
- and
- (e) a screen filter element downstream of the filter element to remove detached fibrous flocked material from the filtered blood.
3 more elements
A method of filtering blood, which method comprises:
- (a) passing the blood generally axially through a blood filter element which comprises a helically coiled strip of sheet material containing on at least one surface thereof a surface layer of a fibrous flocked material compatible with the blood to be filtered, and having a fiber length of less than about 5 mm, the sheet material wound into a helical coil of desired tightness to present a multitude of channels through the flocked material, the helically coiled strip being wound such that an increasing gradient in the tightness of the wind from the upstream to the downstream ends provides for both gradient and depth filtration of the blood;
- and
- (b) recovering the blood so filtered.
A filter for a fluid stream, which filter comprises in combination:
- (a) a filter housing adapted to contain a filter element and having an inlet at the one end for the introduction of a fluid stream to be filtered, and an outlet at the other end for the removal of the filtered stream;
- and
- (b) a filter element which comprises
- (i) a solid, flexible, helically coiled strip of sheet material,
- (ii) a layer of adhesive material on at least one surface of the sheet material, and
- (iii) fibrous particulate material adhesively secured to the adhesive layer to form a surface layer of the fibrous flocked material on the continuous surface, the filter element disposed in the housing as a helical coil of desired tightness to present a multitude of fibrous filter channels through the flocked material on the surface of the coil, the ends of the fibrous particulate material in contact with the adjacent surface of the sheet material or intermeshed with fibrous particulate material on said adjacent sheet material surface, the fibrous flocked material generally of uniform length and uniformly distributed on the surface of the sheet material, and which comprises fibers of not more than about 5 mm in length, the fibrous particulate material forming the flocked layer selected to remove particles from the stream to be filtered, the helical coil disposed to permit only axial flow of the fluid stream through the filter element as the stream passes from the inlet to the outlet of the housing.
3 more elements
A method of filtering blood to remove selected particles or biological constituents of the blood stream, which method comprises:
- (a) passing the blood containing the particles to be removed, axially through a blood filter element which comprises
- (i) a solid, flexible, helically coiled strip of sheet material,
- (ii) a layer of adhesive material on at least one surface of the sheet material, and
- (iii) fibrous particulate material adhesively secured to the adhesie layer to form a surface layer of the fibrous flocked material on the continuous surface, the fibrous flocked material compatible with the blood, the filter element disposed in the housing as a helical coil of desired tightness to present a multitude of fibrous filter channels through the flocked material on the surface of the coil, the ends of the fibrous particulate material in contact with the adjacent surface of the sheet material or intermeshed with fibrous particulate material on said adjacent sheet material surface, the fibrous flocked material generally of uniform length and uniformly distributed on the surface of the sheet material, and which comprises fibers of not more than about 5 mm in length, the fibrous particulate material forming the flocked layer selected to remove particles from the blood to be filtered, the helical coil disposed to permit only axial flow of the blood through the filter element as the blood passes from the inlet to the outlet of the housing;
- and
- (b) recovering the blood so filtered.
3 more elements
Dependencies are inferred from the claim text.