Multi-staged filtration system for blood fluid removal

Patent metadata

Field	Value
Publication number	US-9713668-B2
Application number	US-201314369602-A
Country	US
Kind code	B2
Filing date	Jan 4, 2013
Priority date	Jan 4, 2012
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

A device includes (i) a housing defining an interior, wherein the interior has a blood compartment, a plasma compartment, and a fluid compartment; (ii) a first filter disposed in the interior of the housing, and (iii) a second filter disposed in the interior of the housing. The first filter separates at least a portion of the blood compartment from at least a portion of the plasma compartment. The first filter is configured to allow plasma components, but not cell components, of blood to pass through the first filter from the blood compartment to the plasma compartment. The second filter separates at least a portion of the plasma compartment from at least a portion of the fluid compartment. The second filter is configured to allow fluid and small molecules, but not larger components, to pass through the second filter from the plasma compartment to the fluid compartment. The device may include a sorbent in the plasma compartment to remove or reduce the concentration of selected components of the plasma. In embodiments, a system including the device includes a sorbent with which the plasma may be contacted.

First claim

We claim:

1. A medical device comprising:
a housing defining an interior, wherein the interior has a blood compartment, a plasma compartment, and a fluid compartment;
a first filter disposed in the interior of the housing, wherein the first filter separates at least a portion of the blood compartment from at least a portion of the plasma compartment and wherein the first filter is configured to allow plasma components, but not cell components, of blood to pass through the first filter from the blood compartment to the plasma compartment;
a second filter disposed in the interior of the housing, wherein the second filter separates at least a portion of the plasma compartment from at least a portion of the fluid compartment, and wherein the second filter is configured to allow fluid and small molecules less than 60,000 Da, but generally not larger components greater than 60,000 Da, to pass through the second filter from the plasma compartment to the fluid compartment;
a first outlet positioned on the blood compartment to exit cell enriched fluid from the blood compartment and out of the housing; and
an inlet in communication with the plasma compartment or the reduced fluid compartment.

2. A medical device according to claim 1 , further comprising:
an inlet in communication with the blood compartment;
and
a second outlet in communication with the fluid compartment.

3. A medical device according to claim 2 , further comprising a third outlet in communication with the plasma compartment.

4. A system comprising:
a medical device according to claim 3 ; and
a sorbent medium in fluid communication with the plasma compartment of the medical device and downstream of the third outlet.

5. A system according to claim 4 , further comprising a manifold having a first inlet in communication with the blood compartment of the medical device, a second inlet in communication with the plasma compartment of the medical device and downstream of the sorbent medium, and an outlet in communication with the first and second manifold inlets.

6. The system of claim 4 , wherein the sorbent medium is disposed within the plasma compartment.

7. The system of claim 4 , wherein the sorbent medium is disposed within the fluid compartment.

8. A medical device according to claim 1 , wherein the first filter comprises a first filter porous fiber having a first lumen, and wherein at least a portion of either the blood compartment or the plasma compartment is defined by the first lumen of the first filter porous fiber.

9. A medical device according to claim 8 , wherein the second filter comprises a second filter porous fiber having a second lumen, and wherein at least a portion of either the fluid compartment or the plasma compartment is defined by the second lumen of the second filter porous fiber.

10. A medical device according to claim 9 , wherein a first portion of the plasma compartment is defined by the exterior of the first filter porous fiber, and wherein the device further comprises a manifold having at least one opening in communication with the first portion of the plasma compartment and the lumen of the second filter porous fiber.

11. A medical device according to claim 9 , further comprising a manifold having at least one opening in communication with the lumen of the first filter porous fiber and the lumen of the second porous fiber.

12. A medical device according to claim 1 , wherein either the first filter, the second filter, or both the first and the second filters, comprise a membrane.

13. A medical device according to claim 12 , wherein the membrane is disposed across the housing.

14. A medical device according to claim 1 , wherein the device is in the form of a cartridge.

15. The medical device of claim 1 , further comprising a mixing chamber where blood from the fluid compartment is added prior to returning the blood to the patient.

16. The medical device of claim 1 , further comprising a recirculating loop connecting the any one of the blood compartment, plasma compartment, and fluid compartment.

17. The medical device of claim 1 , further comprising one or more conduits in fluid communication with the second outlet to divert a portion of fluid out of the housing.

18. The medical device of claim 1 , further comprising one or more valves or flow restrictor to divert all or a portion of the fluid out of the housing.

19. A medical device, comprising
a housing defining an interior, wherein the interior has a blood compartment, a plasma compartment, and a fluid compartment;
a first filter disposed in the interior of the housing, wherein the first filter separates at least a portion of the blood compartment from at least a portion of the plasma compartment, and wherein the first filter is configured to allow plasma components, but not cell components, of blood to pass through the first filter from the blood compartment to the plasma compartment;
a second filter disposed in the interior of the housing, wherein the second filter separates at least a portion of the plasma compartment from at least a portion of the fluid compartment, and wherein the second filter is configured to allow fluid and small molecules less than 60,000 Da, but generally not larger components greater than 60,000 Da, to pass through the second filter from the plasma compartment to the fluid compartment;
an outlet positioned on the blood compartment to exit cell enriched fluid from the blood compartment of the housing; and
a sorbent disposed within the plasma compartment or with the reduced fluid compartment, wherein the sorbent is configured to selectively absorb one or more components from plasma or reduced plasma, respectively.

20. A method comprising:
passing a patient's blood into a medical device of claim 1 to form a plasma component and a cell component;
either dialyzing the plasma component to obtain dialyzed plasma or filtering fluid from the plasma component to obtain reduced fluid plasma; and
combining the cell component and the dialyzed plasma or the reduced fluid plasma to generate dialyzed blood.

21. A method according to claim 20 , further comprising introducing the dialyzed plasma or the reduced fluid plasma into the patient.

22. A method according to claim 20 , further comprising removing selected elements from the plasma component via a sorbent.

23. A method according to claim 20 , further comprising removing selected elements from the dialyzed plasma or the reduced fluid plasma via a sorbent.

Assignees

• Collier Kenneth J
• Pudil Bryant J
• Gerber Martin T
• Medtronic Inc

Inventors

• Collier Kenneth J
• Pudil Bryant J
• Gerber Martin T

Classifications

• B01D63/08

  Flat membrane modules · CPC title

• A61M1/14

  Dialysis systems; Artificial kidneys; Blood oxygenators (semi-permeable membranes characterised by the material, manufacturing processes therefor B01D71/00){; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis} · CPC title

• B01D63/043

  with separate tube sheets · CPC title

• B01D63/00

  Apparatus in general for separation processes using semi-permeable membranes · CPC title

• A61M1/1633

  with more than one dialyser unit · CPC title