Systems and methods for removing free and entrained contaminants in plasma

• US 5,935,092 A
• Filed: 12/19/1995
• Issued: 08/10/1999
• Est. Priority Date: 12/20/1990
• Status: Expired due to Term

• Current Assignee: Fenwal Incorporated (Fresenius SE & Co. KGaA)
• Original Assignee: Baxter International Inc.
• Inventors: Chapman, John, Sun, Chong-Son, Bischof, Daniel F., Herman, Robert E.
• Primary Examiner(s): Weiss, John G.
• Assistant Examiner(s): O YONG, KI
• Application Number:
  US08/574,741
• Time in Patent Office: 1,330 Days
• Field of Search: 435/2, 604/406, 604/4-6, 422/56, 210/496
• US Class Current: 604/6.03
• CPC Class Codes: A61K 35/16 Blood plasma; Blood serum umbilical cord blood A61K35/51
• CPC Class Codes: A61L 2/0011 using physical methods
• CPC Class Codes: A61L 2/0017 Filtration
• CPC Class Codes: A61L 2/08 Radiation
• CPC Class Codes: A61M 1/0218 with filters
• CPC Class Codes: A61M 1/3633 Blood component filters, e.g. leukocyte filters
• CPC Class Codes: A61M 1/3679 by absorption A61M1/3675 takes precedence
• CPC Class Codes: A61M 1/3681 by irradiation
• CPC Class Codes: A61M 1/3683 using photoactive agents
• CPC Class Codes: A61M 2202/0057 retained by adsorption
• CPC Class Codes: A61M 2202/0439 White blood cells; Leucocytes lymphocytes A61M2202/0407
• CPC Class Codes: B01J 19/122 Incoherent waves gamma-radiation B01J19/082

Abstract

Systems and methods treat plasma carrying contaminants and leukocytes that are capable of entraining contaminants. The systems and methods separate leukocytes from the plasma by filtration, thereby removing contaminants entrained within leukocytes. The systems and methods also add to the plasma a photoactive material and emit radiation at a selected wavelength into the plasma to activate the photoactive material and thereby eradicate the contaminant that is free of entrainment by leukocytes.

Claims

1. A system for treating fresh frozen plasma comprising

a source container adapted to hold fresh frozen plasma for thawing,

tubing adapted to be coupled to the source container to convey thawed plasma from the source container, and

a filter in the tubing to separate leukocytes from thawed plasma conveyed from the source container comprising a prefilter layer including glass fiber and, in a downstream flow direction from the prefilter, a layer of material having pores sized to remove leukocytes by exclusion.

2. A system according to claim 1

wherein the filter includes, in a downstream flow direction from the prefilter, first and second layers of material having pores sized to remove leukocytes by exclusion, the first layer being located between the prefilter layer and the second layer, the pores of the first layer being larger than the pores of the second layer.

3. A system according to claim 1 and further including a transfer container coupled to the tubing to receive thawed plasma after passage through the filter.

4. A system for treating plasma comprising

a source container holding plasma,

tubing adapted to be coupled the source container to convey plasma from the source container,

a filter in the tubing to separate leukocytes from plasma conveyed from the source container comprising a prefilter layer including glass fiber and, in a downstream flow direction from the prefilter, a layer of material having pores sized to remove leukocytes by exclusion, and

means for adding a photoactive material to the plasma.

7. A system according to claim 4 or 5 or 6

wherein the filter includes, in a downstream flow direction from the prefilter, first and second layers of material having pores sized to remove leukocytes by exclusion, the first layer being located between the prefilter layer and the second layer, the pores of the first layer being larger than the pores of the second layer.

8. A system according to claim 4 or 5 or 6

wherein the photoactive material is methylene blue.

9. A system according to claim 4 or 5 or 6 and further including a light source emitting radiation at a selected wavelength into the plasma to activate the photoactive material.

5. A system for treating plasma comprising

a source container holding plasma,

a transfer container,

tubing adapted to be coupled the source container and the transfer container to convey plasma from the source container to the transfer container,

a filter in the tubing to separate leukocytes from plasma conveyed from the source container comprising a prefilter layer including glass fiber and, in a downstream flow direction from the prefilter, a layer of material having pores sized to remove leukocytes by exclusion, and

means for adding a photoactive material to the plasma in one of the source container and transfer container.

6. A system for treating plasma comprising

a transfer container,

a photoactive material in the transfer container,

tubing coupled to the transfer container and adapted to be coupled a source container of plasma to convey plasma from the source container into the transfer container for mixing with the photactive material, and

a filter in the tubing to separate leukocytes from plasma conveyed into the transfer container comprising a prefilter layer including glass fiber and, in a downstream flow direction from the prefilter, a layer of material having pores sized to remove leukocytes by exclusion.