Blood component separation device
An object of the invention is to provide a blood component separation device that can keep the concentration of anticoagulant in a predetermined blood component to a constant level to minimize aggregation of a predetermined blood component (for example, aggregation of platelets). One aspect of the present invention is a blood component separation device that separates the predetermined blood component from the blood drawn from a blood donor while supplying to the blood an anticoagulant for preventing coagulation of the blood, where an anticoagulant ratio, or a ratio of an amount of the anticoagulant supplied in relation to the blood, is set according to a hematocrit value of the blood donor so that a concentration of the anticoagulant in the predetermined blood component becomes a predetermined value.
1. A method for controlling a blood component separation device comprising
selecting a predetermined blood component to be collected in a collected volume, said predetermined blood component comprising platelets;
selecting a concentration of an anticoagulant to be collected with said predetermined blood component in said collected volume;
supplying supplied anticoagulant to whole blood withdrawn from a donor in a selected ratio of an amount of the anticoagulant to an amount of withdrawn whole blood, such that the collected volume of said predetermined blood component contains said selected concentration of anticoagulant; and
separating at least said predetermined blood component and at least some of said anticoagulant from said whole blood and said supplied anticoagulant; and
collecting said predetermined blood component and said at least some of said anticoagulant into said collected volume,
wherein said selected ratio is 1:7.8 when a donor's hematocrit is 34 or 1:7.9 when a donor's hematocrit is 35 or 1:8.0 when a donor's hematocrit is 36 or 1:8.1 when a donor's hematocrit is 37 or 1:8.3 when a donor's hematocrit is 38 or 1:8.4 when a donor's hematocrit is 39 or 1:8.5 when a donor's hematocrit is 40 or 1:8.7 when a donor's hematocrit is 41 or 1:8.8 when a donor's hematocrit is 42 or 1:9.0 when a donor's hematocrit is 43.
2. The method according to claim 1 wherein said step of separating at least said predetermined blood component from said whole blood further comprises
steps (a), (b), (c), and (d), wherein
step (a) is a centrifugal separation step of introducing said whole blood withdrawn from said donor into a centrifugal separator to separate whole blood into a plurality of blood components,
step (b) is a circulation flow step of reintroducing a first blood component, said first blood component comprising at least plasma into the centrifugal separator together with additional whole blood,
step (c) is a circulation/acceleration step, performed after a predetermined amount of the first blood component is separated in the circulation flow step, said circulation/acceleration step comprising stopping supply of whole blood to the centrifugal separator and reintroducing only the first blood component into the centrifugal separator, further performing circulation for a predetermined period of time, and then increasing a circulation speed so that said selected predetermined blood component is separated by the centrifugal separator and collected in said collected volume, and
step (d) is a blood returning step, performed after collecting a predetermined amount of said selected predetermined blood component in the circulation/acceleration step, said blood returning step comprising returning blood components, which are not collected, to said donor, and wherein
steps (a), (b), (c), and (d) are performed as one cycle a plurality of times.
3. The method for controlling according to claim 2 , wherein
the circulation/acceleration step includes
a first collecting step of transferring a portion of said selected predetermined blood component with low-concentration of platelets to a temporary storage container, and
a second collecting step of collecting a portion of said selected predetermined blood component with high-concentration of platelets, and wherein
said selected predetermined blood component with low-concentration of platelets transferred to the temporary storage container is reintroduced into the centrifugal separator together with whole blood drawn from said donor in a following cycle.
4. The method according to claim 1 , further comprising
a priming step of supplying the anticoagulant, before blood drawing, to a centrifugal separator via a tube coupled to a blood drawing needle, and
said amount of the anticoagulant supplied in said selected ratio of said amount of anticoagulant to said withdrawn whole blood includes an amount of the anticoagulant supplied in the priming step.
5. The method according to claim 4 wherein said step of separating at least said predetermined blood component from said whole blood further comprises steps (a), (b), (c), and (d), wherein
step (a) is a centrifugal separation step of introducing said whole blood withdrawn from said donor into a centrifugal separator to separate whole blood into a plurality of blood components,
step (b) is a circulation flow step of reintroducing a first blood component, said first blood component comprising at least plasma, into the centrifugal separator together with additional whole blood,
step (c) is a circulation/acceleration step, performed after a predetermined amount of the first blood component is separated in the circulation flow step, said circulation/acceleration step comprising stopping supply of whole blood to the centrifugal separator and reintroducing only the first blood component into the centrifugal separator, further performing circulation for a predetermined period of time, and then increasing a circulation speed so that said selected predetermined blood component is separated by the centrifugal separator and collected in said collected volume, and
step (d) is a blood returning step, performed after collecting a predetermined amount of said selected predetermined blood component in the circulation/acceleration step, said blood returning step comprising returning blood components, which are not collected, to said donor, and wherein
steps (a), (b), (c), and (d) are performed as one cycle a plurality of times.
6. The method for controlling a blood component separation device according to claim 5 , wherein
the circulation/acceleration step includes
a first collecting step of transferring a portion of said selected predetermined blood component with low-concentration of platelets to a temporary storage container, and
a second collecting step of collecting a portion of said selected predetermined blood component with high-concentration, and wherein
said selected predetermined blood component with low-concentration of platelets transferred to the temporary storage container is reintroduced into the centrifugal separator together with whole blood drawn from said donor in a following cycle.
7. The method for controlling a blood component separation device according to claim 1 , wherein
the step of selecting a concentration of an anticoagulant comprises selecting a concentration of acid-citrate-dextrose (“ACD”), and
the step of selecting a predetermined blood component comprises selecting a platelet liquid.
8. The method according to claim 1 wherein said predetermined blood component comprises platelets and selecting said concentration of anticoagulant comprises selecting a concentration of anticoagulant to reduce a rate of occurrence of aggregation of platelets in said collected volume.