Extracorporeal blood processing methods and apparatus
First Claim
1. A method for extracorporeal separation and collection of blood components from a donor/patient, comprising:
- flowing blood into a centrifugal dual stage blood processing vessel, said processing vessel including a first stage and a second stage, the second stage being separated from said first stage by a dam, a blood inlet for communicating blood into the first stage, a plasma outlet disposed in the second stage and a red blood cell outlet disposed in the first stage;
centrifugally separating the blood into separated blood components including;
separating plasma from said blood within said centrifugal dual stage blood processing vessel to establish separated plasma, whereby a portion of the separated plasma flows over the dam in the processing vessel to the plasma outlet in the second stage of the processing vessel;
separating red blood cells from said blood within said centrifugal dual stage blood processing vessel to establish separated red blood cells whereby the separated red blood cells remain in the first stage of the processing vessel and flow to the red blood cell outlet;
establishing a pre-determined packing factor for the separated red blood cells within said blood processing vessel;
collecting at least a portion of at least one separated blood component including;
collecting as a double red blood cell product at least a portion of said separated red blood cells in a red blood cell collection reservoir separate from said blood processing vessel to establish collected red blood cells.
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Accused Products
Abstract
Methods and apparatus particularly involving the separation of blood into blood components and the collection of such components are disclosed. In one aspect, an extracorporeal method for the collection of plasma and red blood cells is provided, wherein the collection of plasma and red blood cells may occur simultaneously or subsequently utilizing the same dual stage blood processing vessel. The flow of blood to the blood processing vessel and return of uncollected blood components may be provided via a single needle, wherein blood is removed from and returned to a donor/patient during alternating blood removal and blood return submodes. Platelet separation and collection options are also described. In either case, prior to red blood cell collection, a set-up phase may be carried out to set a predetermined hematocrit and AC ratio. Replacement fluid delivery may optionally also be provided either substantially continuously during any collection phase(s) and/or in a bolus mode.
205 Citations
29 Claims
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1. A method for extracorporeal separation and collection of blood components from a donor/patient, comprising:
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flowing blood into a centrifugal dual stage blood processing vessel, said processing vessel including a first stage and a second stage, the second stage being separated from said first stage by a dam, a blood inlet for communicating blood into the first stage, a plasma outlet disposed in the second stage and a red blood cell outlet disposed in the first stage;
centrifugally separating the blood into separated blood components including;
separating plasma from said blood within said centrifugal dual stage blood processing vessel to establish separated plasma, whereby a portion of the separated plasma flows over the dam in the processing vessel to the plasma outlet in the second stage of the processing vessel;
separating red blood cells from said blood within said centrifugal dual stage blood processing vessel to establish separated red blood cells whereby the separated red blood cells remain in the first stage of the processing vessel and flow to the red blood cell outlet;
establishing a pre-determined packing factor for the separated red blood cells within said blood processing vessel;
collecting at least a portion of at least one separated blood component including;
collecting as a double red blood cell product at least a portion of said separated red blood cells in a red blood cell collection reservoir separate from said blood processing vessel to establish collected red blood cells. - View Dependent Claims (2, 3, 4, 5, 10, 11, 12, 13, 14, 15, 18, 19, 25, 27, 28, 29)
removing said blood from a donor/patient through a single needle;
returning uncollected separated blood components of said blood to said donor/patient through said single needle.
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19. A method as recited in claim 18, wherein said removing and returning steps are alternately and repeatedly performed.
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25. A method as recited in claim 1, further comprising:
adding a storage solution to said separated red blood cells collected in said red blood cell collection reservoir.
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27. A method as recited in claim 1, further comprising:
leukoreduction filtering of said separated red blood cells collected in said red blood cell collection reservoir.
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28. A method according to claim 1 wherein said packing factor is between 11 and 21.
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29. A method according to claim 28 wherein said packing factor is at least about 13.
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6. A method for extracorporeal separation and collection of blood components from a donor/patient, comprising:
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flowing blood into a centrifugal dual stage blood processing vessel, said processing vessel including a first stage and a second stage, the second stage being separated from said first stage by a dam, a blood inlet for communicating blood into the first stage, a plasma outlet disposed in the second stage and a red blood cell outlet disposed in the first stage;
centrifugally separating the blood into separated blood components including;
separating plasma from said blood within said centrifugal dual stage blood processing vessel to establish separated plasma, whereby a portion of the separated plasma flows over the dam in the processing vessel to the plasma outlet in the second stage of the processing vessel;
separating red blood cells from said blood within said centrifugal dual stage blood processing vessel to establish separated red blood cells whereby the separated red blood cells remain in the first stage of the processing vessel and flow to the red blood cell outlet;
establishing a packing factor of at least about 13 for the separated red blood cells within said blood processing vessel;
collecting at least a portion of at least one separated blood component including;
collecting as a double red blood cell product at least a portion of said separated red blood cells in a red blood cell collection reservoir separate from said blood processing vessel to establish collected red blood cells collecting at least a portion of the separated plasma in a plasma collection reservoir separate from said blood processing vessel to establish collected plasma; and
wherein said plasma collection step is performed at least partially contemporaneously with said red blood cell collection step. - View Dependent Claims (7, 8, 9)
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16. A method for extracorporeal separation and collection of blood components from a donor/patient, comprising:
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flowing blood into a centrifugal dual stage blood processing vessel, said processing vessel including a first stage and a second stage, the second stage being separated from said first stage by a dam, a blood inlet for communicating blood into the first stage, a plasma outlet disposed in the second stage and a red blood cell outlet disposed in the first stage;
centrifugally separating the blood into separated blood components including;
separating plasma from said blood within said centrifugal dual stage blood processing vessel to establish separated plasma, whereby a portion of the separated plasma flows over the dam in the processing vessel to the plasma outlet in the second stage of the processing vessel;
separating red blood cells from said blood within said centrifugal dual stage blood processing vessel to establish separated red blood cells whereby the separated red blood cells remain in the first stage of the processing vessel and flow to the red blood cell outlet;
collecting at least a portion of at least one separated blood component including;
collecting as a double red blood cell product at least a portion of said separated red blood cells in a red blood cell collection reservoir separate from said blood processing vessel to establish collected red blood cells in which said double volume of collected red blood cells totals substantially about 400 milliliters contained in two substantially separate reservoirs.
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17. A method for extracorporeal separation and collection of blood components from a donor/patient, comprising:
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flowing blood into a centrifugal dual stage blood processing vessel, said processing vessel including a first stage and a second stage, the second stage being separated from said first stage by a dam, a blood inlet for communicating blood into the first stage, a plasma outlet disposed in the second stage and a red blood cell outlet disposed in the first stage;
centrifugally separating the blood into separated blood components including;
separating plasma from said blood within said centrifugal dual stage blood processing vessel to establish separated plasma, whereby a portion of the separated plasma flows over the dam in the processing vessel to the plasma outlet in the second stage of the processing vessel;
separating red blood cells from said blood within said centrifugal dual stage blood processing vessel to establish separated red blood cells whereby the separated red blood cells remain in the first stage of the processing vessel and flow to the red blood cell outlet;
flowing the separated blood components out of said blood processing vessel, wherein substantially all of said separated blood components flowing out of the blood processing vessel are accumulated for re-infusion to a donor/patient during the set-up step;
collecting at least a portion of at least one separated blood component including;
collecting as a double red blood cell product at least a portion of said separated red blood cells in a red blood cell collection reservoir separate from said blood processing vessel to establish collected red blood cells. - View Dependent Claims (21, 22, 23, 24)
reducing said inlet flow rate.
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22. A method as recited in claim 17, wherein said blood processing vessel is rotated at an rpm rate, and wherein said set-up step comprises:
increasing said rpm rate.
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23. A method as recited in claim 17, said set-up step including:
maintaining a predetermined anticoagulant infusion rate to said donor/patient.
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24. A method as recited in claim 17, said set-up step including:
removing the separated red blood cells and a portion of the separated plasma together through the RBC outlet from said blood processing vessel to establish the interface between the separated RBC, and the separated plasma at the RBC outlet in the first stage of the blood processing vessel.
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20. A method for extracorporeal separation and collection of blood components from a donor/patient, comprising:
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removing blood from a donor/patient through a single needle;
flowing said blood into a centrifugal dual stage blood processing vessel, said processing vessel including a first stage and a second stage, the second stage being separated from said first stage by a dam, a blood inlet for communicating blood into the first stage, a plasma outlet disposed in the second stage and a red blood cell outlet disposed in the first stage;
centrifugally separating the blood into separated blood components including;
separating plasma from said blood within said centrifugal dual stage blood processing vessel to establish separated plasma, whereby a portion of the separated plasma flows over the dam in the processing vessel to the plasma outlet in the second stage of the processing vessel;
separating red blood cells from said blood within said centrifugal dual stage blood processing vessel to establish separated red blood cells whereby the separated red blood cells remain in the first stage of the processing vessel and flow to the red blood cell outlet;
collecting at least a portion of at least one separated blood component including;
recirculating a portion of the uncollected separated blood components into said blood processing vessel; and
collecting as a double red blood cell product at least a portion of said separated red blood cells in a red blood cell collection reservoir separate from said blood processing vessel to establish collected red blood cells;
returning substantially all of the uncollected separated blood components to said donor/patient; and
collecting at least a portion of the separated plasma in a plasma collection reservoir separate from said blood processing vessel to establish collected plasma; and
wherein said plasma collection step is performed at least partially contemporaneously with said red blood cell collection step.
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26. A method for extracorporeal separation and collection of blood components from a donor/patient, comprising:
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flowing blood into a centrifugal dual stage blood processing vessel, said processing vessel including a first stage and a second stage, the second stage being separated from said first stage by a dam, a blood inlet for communicating blood into the first stage, a plasma outlet disposed in the second stage and a red blood cell outlet disposed in the first stage;
centrifugally separating the blood into separated blood components including;
separating plasma from said blood within said centrifugal dual stage blood processing vessel to establish separated plasma, whereby a portion of the separated plasma flows over the dam in the processing vessel to the plasma outlet in the second stage of the processing vessel;
separating red blood cells from said blood within said centrifugal dual stage blood processing vessel to establish separated red blood cells whereby the separated red blood cells remain in the first stage of the processing vessel and flow to the red blood cell outlet;
collecting at least a portion of at least one separated blood component including;
collecting as a double red blood cell product at least a portion of said separated red blood cells in a red blood cell collection reservoir separate from said blood processing vessel to establish collected red blood cells;
adding a storage solution to said separated red blood cells collected in said red blood cell collection reservoir, said storage solution being added through an assembly having a sterile barrier filter.
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Specification