Membrane apparatus with enhanced mass transfer, heat transfer and pumping capabilities via active mixing
First Claim
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1. A blood pump-oxygenator comprising:
- (a) a housing defining a blood flow path and having a venous blood inlet, an arterial blood outlet, an oxygen inlet and an oxygen outlet;
(b) a double lumen shaft defining a gas inlet path and a gas outlet path;
wherein the double lumen shaft gas inlet path is in fluid communication with the housing gas inlet and the double lumen shaft gas outlet is in fluid communication with the housing gas outlet; and
(c) at least one distributor element past which blood may flow, mounted on the double lumen shaft, the at least one distributor element having;
(i) an inner ring with a first face and a second face;
(ii) an outer ring concentrically spaced with respect to the inner ring such that the inner ring and the outer ring define an oxygen supply plenum and an oxygen return plenum;
(iii) a first hollow spoke in fluid communication with the oxygen inlet path and the oxygen supply plenum;
(vi) a second hollow spoke in fluid communication with the oxygen outlet path and the oxygen return plenum; and
(vii) a plurality of selectively fluid-permeable membrane elements extending across the distributor disk blood flow path, each of the selectively fluid-permeable membrane elements in fluid communication with the oxygen supply plenum and the oxygen return plenum; and
wherein when blood flows through the housing flow path and oxygen flows through and diffuses across the plurality of selectively fluid-permeable membrane elements and when the at least one distributor element rotates about the at least one double lumen shaft oxygenation/decarbonation of blood and simultaneous pumping of blood occurs.
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Abstract
A combination mass transfer and pump apparatus, which in a single step actively mixes a first mass and a second mass and simultaneously pumps one of the first mass and the second mass through the apparatus. The combination mass transfer and pump apparatus substantially comprises a housing and at least one distributor element having a plurality of selectively fluid-permeable membrane elements wherein the at least one distributor element is agitated within the second mass such that the first mass diffuses across the selectively fluid-permeable membrane elements, mixing with the second mass, and in the same step the second mass is pumped through the housing.
89 Citations
42 Claims
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1. A blood pump-oxygenator comprising:
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(a) a housing defining a blood flow path and having a venous blood inlet, an arterial blood outlet, an oxygen inlet and an oxygen outlet;
(b) a double lumen shaft defining a gas inlet path and a gas outlet path;
wherein the double lumen shaft gas inlet path is in fluid communication with the housing gas inlet and the double lumen shaft gas outlet is in fluid communication with the housing gas outlet; and
(c) at least one distributor element past which blood may flow, mounted on the double lumen shaft, the at least one distributor element having;
(i) an inner ring with a first face and a second face;
(ii) an outer ring concentrically spaced with respect to the inner ring such that the inner ring and the outer ring define an oxygen supply plenum and an oxygen return plenum;
(iii) a first hollow spoke in fluid communication with the oxygen inlet path and the oxygen supply plenum;
(vi) a second hollow spoke in fluid communication with the oxygen outlet path and the oxygen return plenum; and
(vii) a plurality of selectively fluid-permeable membrane elements extending across the distributor disk blood flow path, each of the selectively fluid-permeable membrane elements in fluid communication with the oxygen supply plenum and the oxygen return plenum; and
wherein when blood flows through the housing flow path and oxygen flows through and diffuses across the plurality of selectively fluid-permeable membrane elements and when the at least one distributor element rotates about the at least one double lumen shaft oxygenation/decarbonation of blood and simultaneous pumping of blood occurs.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A blood pump-oxygenator, comprising:
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a housing defining an interior through which blood can flow;
a rotatable shaft, rotatably mounted within the housing, the shaft having a supply lumen through which a first fluid can flow;
a ring, disposed within the interior of the housing and mounted to the rotatable shaft, the ring comprising;
(i) a first side and a second side;
(ii) a plurality of hollow fibers that are fluid permeable and that extend across the first side of the ring;
(iii) a first annular lumen extending along an arc within the ring, the first annular lumen being in fluid communication with the supply lumen and the plurality of hollow fibers, such that as blood passes through the interior of the housing and the shaft and ring are rotated the blood is pumped through the housing and, the first fluid travels from the supply lumen, through the first annular lumen and to the plurality of hollow fibers and diffuses through the plurality of hollow fibers into the blood. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
(i) a plurality of hollow fibers that are fluid permeable extending from the ring; and
(ii) a first annular lumen extending along an arc within the respective ring, the first annular lumen being in fluid communication with the supply lumen.
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25. The blood pump-oxygenator of claim 15, wherein the plurality of hollow fibers comprise a plurality of fibers of polyethylene.
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26. The blood pump-oxygenator of claim 15, wherein the plurality of hollow fibers comprise a plurality of fibers of polypropylene.
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27. The blood pump-oxygenator of claim 15, wherein the plurality of hollow fibers are coupled to the ring with a potting material.
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28. The blood pump-oxygenator of claim 15, wherein the plurality of hollow fiber comprise a first set of selectively fluid-permeable elements that extend in a first direction and parallel to each other across the ring and a second set of selectively fluid-permeable elements that extend in a second direction and parallel to each other across the ring.
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29. The blood pump-oxygenator of claim 15, wherein the plurality of selectively fluid-permeable elements comprise a first set of selectively fluid-permeable elements that extend in a first direction across the ring and a second set of selectively fluid-permeable elements that extend in a second direction across the ring at a preferred angle to the first direction.
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30. A blood pump-oxygenator, comprising:
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a housing defining an interior through which blood can flow;
a shaft, rotatably mounted within the housing, the shaft having a first supply lumen through which a first fluid can flow, a second supply lumen through which a heat exchange fluid can flow, a third lumen that is in fluid communication with the first supply lumen and that defines an outlet path for the first fluid, and a fourth lumen that is in fluid communication with the second supply lumen and that defines an outlet path for the heat exchange fluid;
a ring, disposed within the interior of the housing and mounted to the rotatable shaft, the ring comprising;
(i) a first set of hollow fibers that are fluid permeable extending from the ring;
(ii) a first annular lumen extending along an arc within the ring, the first annular lumen being in fluid communication with the first supply lumen and the third lumen, such that when blood passes through the interior of the housing and the ring is rotated, the first fluid flows from the first supply lumen to the first set of hollow fibers, diffuses through the first set of hollow fibers and into the blood such that a gas exchange takes place with the blood and the first fluid then flows through the third lumen; and
(iii) a second set of hollow fibers that are fluid impermeable extending from the ring, the second set of hollow fibers being in fluid communication with the second supply lumen, such that heat exchange fluid can flow from the second supply lumen, through the second set of hollow fibers where heat transfer occurs between the blood and the heat exchange fluid and the second set of hollow fibers being in fluid communication with the fourth lumen, so that the heat exchange fluid can flow from the second set of hollow fibers to the fourth lumen. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
(i) a first set of hollow fibers that are fluid permeable extending from the ring; and
(ii) a first annular lumen extending along an arc within the respective ring, the first annular lumen being in fluid communication with the first supply lumen.
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37. The blood pump-oxygenator of claim 30, wherein the first set of hollow fibers comprise a plurality of fibers of polyethylene.
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38. The blood pump-oxygenator of claim 30, wherein the first set of hollow fibers comprise a plurality of fibers of polypropylene.
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39. The blood pump-oxygenator of claim 30, wherein the first set of hollow fibers are coupled to the ring with a potting material.
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40. The blood pump-oxygenator of claim 30, wherein the first set of hollow fibers comprise a first group of selectively fluid-permeable elements that extend in a first direction and parallel to each other across the ring and a second group of selectively fluid-permeable elements that extend in a second direction and parallel to each other across the ring.
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41. The blood pump-oxygenator of claim 30, wherein the first set of hollow fibers comprise a first group of selectively fluid-permeable elements that extend in a first direction across the ring and a second group of selectively fluid-permeable elements that extend in a second direction across the ring that is at a preferred angle to the first direction.
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42. The blood pump-oxygenator of claim 30, wherein the blood flows substantially perpendicular to the second set of hollow fibers.
Specification