Granted Patent B2

US 12,564,668 · App. 18/216,009 · Granted Mar 3, 2026

Inventors: Dennis J. Hlavinka (Arvada, CO); Thomas J. Felt (Boulder, CO)

Assignee: Terumo BCT, Inc.

A61M1/3693A61M2205/3331

Abstract

Claims (32)

1 . A method for collecting a blood component, the method comprising:

drawing whole blood into a centrifuge;

spinning the centrifuge to cause centrifugal force to act on the whole blood to separate the whole blood into a least a first blood component and a second blood component that is different from the first blood component;

extracting the first blood component from the centrifuge;

detecting when the second blood component is about to be extracted from the centrifuge;

after the second blood component is detected and while the centrifuge continues to spin, flowing the separated first blood component back towards the centrifuge to move at least the second blood component from the centrifuge;

monitoring an inlet pressure of the whole blood entering the centrifuge;

determining a back pressure at the inlet of the centrifuge; and

equating a change in back pressure with a radial position of an interface between the first blood component and the second blood component in the centrifuge.

2 . The method of claim 1 , wherein the first blood component includes plasma, platelets, red blood cells, high hematocrit blood, or a combination thereof.

3 . The method of claim 2 , wherein the second blood component includes plasma, platelets, red blood cells, high hematocrit blood, or a combination thereof.

4 . The method of claim 2 , wherein the second blood component includes red blood cells.

5 . The method of claim 1 , wherein the centrifuge spins at a first speed when separating the first blood component from the whole blood.

6 . The method of claim 5 , wherein the centrifuge continues to spin at the first speed when flowing the separated first blood component back towards the centrifuge.

7 . The method of claim 6 , wherein the centrifuge spins at a second speed when drawing the whole blood into the centrifuge.

8 . The method of claim 7 , wherein the second speed is slower than the first speed.

9 . The method of claim 1 , wherein

the centrifuge is configured to receive a blood component collection set, and

the blood component collection set is configured to receive the first blood component.

10 . The method of claim 9 , wherein the method further includes:

inserting the blood component collection set into the centrifuge.

11 . The method of claim 9 , wherein the blood component collection set includes a blood component separation bladder that separates the first blood component.

12 . The method of claim 11 , wherein

the centrifuge includes a filler, and

the filler is configured to spin the blood component separation bladder.

13 . The method of claim 12 , wherein the filler includes a separation insert channel that is configured to receive the blood component separation bladder.

14 . The method of claim 13 , the method further includes:

inserting the blood component separation bladder into the separation insert channel of the filler.

15 . The method of claim 1 , wherein detecting when the second blood component is about to be extracted from the centrifuge includes detecting an interface between the first blood component and the second blood component.

16 . The method of claim 15 , wherein the method further includes:

detecting the radial position of the interface between the first blood component and the second blood component in the centrifuge.

17 . The method of claim 1 , wherein the monitoring of the inlet pressure includes receiving an output signal from a sensor disposed at an inlet of the centrifuge.

Assignments (1)

Continuity (2)

References Cited (79)