Removal and deactivation of viruses from blood

• US 7,753,869 B2
• Filed: 04/24/2007
• Issued: 07/13/2010
• Est. Priority Date: 03/17/2003
• Status: Expired due to Fees

• Current Assignee: Hemavation LLC
• Original Assignee: Hemavation LLC
• Inventors: Mallett, Scott R., Walker, Kimberly A., Davidner, Alan A.
• Primary Examiner(s): Deak; Leslie R
• Application Number:
  US11/739,574
• Publication Number:
  US 20070190050A1
• Time in Patent Office: 1,176 Days
• Field of Search: 604/4.01, 604/5.01, 604/5.04, 604/6.01, 604/6.09, 604/6.13, 422/44, 210/645, 210/650, 210/663, 210/805, 210/774
• US Class Current: 604/6.08
• CPC Class Codes: A61L 2/0011 using physical methods
• CPC Class Codes: A61M 1/3431 upstream of the filter
• CPC Class Codes: A61M 1/3468 using treated filtrate as substitution fluid
• CPC Class Codes: A61M 1/3472 with treatment of the filtrate
• CPC Class Codes: A61M 1/3482 by filtrating the filtrate using another cross-flow filter, e.g. a membrane filter
• CPC Class Codes: A61M 1/3623 Means for actively controlling temperature of blood
• CPC Class Codes: A61M 1/3681 by irradiation
• CPC Class Codes: A61M 1/3683 using photoactive agents
• CPC Class Codes: A61M 2205/053 ultraviolet
• CPC Class Codes: A61M 2205/75 with filters
• CPC Class Codes: A61M 2230/207 hematocrit

Abstract

A method and apparatus for preventing and treating septicemia in patient blood is provided. The extracorporeal system includes an antimicrobial device to inactivate at least 99% of bloodborne microorganisms, a hemoconcentrator/filtration unit to remove approximately 50-75% of target molecules from the patient blood and a filter unit to remove target molecules from patient blood from the sieved plasma filtrate. Target molecules are produced by microorganisms, as well as by the patient'"'"'s cells. These molecules include endotoxins from Gram negative bacteria, exotoxins from Gram negative and Gram positive bacteria, as well as RAP protein mediator from Staphylococcus aureus, and cell mediators such as tumor necrosis factor-alpha, and interleukin 1-beta, interleukin 6, complement proteins C3a and C5a, and bradykinin.

Claims

1. A method of treating a patient infected with a virus, comprising:

removing at least a portion of the patient'"'"'s virus-infected blood;

diluting said at least a portion of the blood with a diluent to provide diluted blood, thereby reducing a viral concentration in said at least a portion of the blood;

irradiating at least a portion of the diluted blood using a UV light source;

concentrating the diluted blood using a hemoconcentrator thereby removing at least a portion of the diluent therefrom;

returning the treated blood to the patient,

wherein irradiating at least a portion of the diluted blood comprises providing a fluid chamber adjacent to the UV light source, said fluid chamber confining the diluted blood to a thin film for exposure to said UV light source;

wherein a portion of the diluted blood is transported through a serpentine path during irradiation;

wherein the UV light source is configured to directly inactivate or kill one or more viruses in the diluted blood while the diluted blood is transported along a serpentine path within the fluid chamber.

2. The method of claim 1, further comprising filtering the diluted blood to remove one or more viruses from said diluted blood.

3. The method of claim 1, further comprising oxygenating the blood received from the patient.

4. The method of claim 1, further comprising adding at least one vitamin to the at least a portion of the patient'"'"'s virus-infected blood to further target the deactivation or destruction of viruses present within said blood.

5. The method of claim 1, further comprising heating or cooling the blood to about body temperature.

6. The method of claim 1, further comprising heating or cooling the blood to between about 34°

C. to about 42°

C.

7. The method of claim 1, further comprising returning the diluent removed from the blood to a diluent source via a recycle path.

8. The method of claim 7, wherein said recycle path comprises a recycle path filter.

9. A method of treating a patient infected with a virus, comprising:

removing at least a portion of the patient'"'"'s virus-infected blood;

filtering said virus-infected blood to remove one or more viruses from said blood, thereby producing treated blood;

heating or cooling the blood to about body temperature;

returning the treated blood to the patient;

diluting at least a portion of the blood with a diluent to provide diluted blood, thereby reducing a concentration of viruses in said at least a portion of the blood;

irradiating at least a portion of the diluted blood using a UV light source; and

concentrating the diluted blood using a hemoconcentrator thereby removing at least a portion of the diluent therefrom.

10. The method of claim 9, wherein irradiating at least a portion of the diluted blood comprises providing a fluid chamber adjacent to the UV light source, said fluid chamber confining the diluted blood to a thin film for exposure to said UV light source,

wherein concentrating the diluted blood using a hemoconcentrator thereby removing at least a portion of the diluent therefrom;

wherein a portion of the diluted blood is transported through a serpentine path during irradiation; and

wherein the UV light source is configured to directly inactivate or kill one or more viruses in the diluted blood while the diluted blood is transported along a serpentine path within the fluid chamber.

11. The method of claim 9, further comprising oxygenating the blood received from the patient.

12. The method of claim 9, further comprising adding at least one vitamin to the at least a portion of the blood to further target the deactivation or destruction of viruses present within said blood.

13. The method of claim 9, wherein the blood is thermally conditioned to between about 34°

C. to about 42°

C.

14. A method of treating a patient infected with a virus, comprising:

removing at least a portion of the patient'"'"'s virus-infected blood;

irradiating at least a portion of the blood using a UV light source;

wherein the UV light source is configured to directly inactivate or kill one or more viruses in the diluted blood while the diluted blood is transported along a serpentine path of a fluid chamber;

filtering at least a portion of the blood to remove one or more viruses from said blood, thereby producing treated blood; and

returning the treated blood to the patient.

15. The method of claim 14, further comprising adding at least one vitamin to the at least a portion of the blood to further target the deactivation or destruction of viruses present within said blood.

16. The method of claim 14, further comprising oxygenating the blood received from the patient.

17. The method of claim 14, further comprising thermally-conditioning the blood to about body temperature.

18. The method of claim 14, further comprising heating or cooling the blood to between about 34°

C. to about 42°

C.