Patent Application

App. No. 18/640,626

Abstract

Claims (46)

1 . A method of operating a blood processing system, wherein the blood processing system comprises a centrifuge, and wherein the centrifuge comprises a first port and a second port, the method comprising:

introducing blood into the centrifuge through the first port;

separating the blood into a plasma layer, a buffy coat layer, and a red blood cell layer within the centrifuge and by rotating the centrifuge;

executing a first monitoring step comprising monitoring a location of an interface between the buffy coat layer and the red blood cell layer within the centrifuge;

executing a second monitoring step comprising monitoring for an existence of a first condition and a second condition;

the first condition requiring: 1) an amount of the blood introduced into the centrifuge being both less than a target processed blood volume and within a first predetermined amount of the target processed blood volume; and 2) a determination by the blood processing system that the interface is in a first position from the first monitoring step;

the second condition being the amount of the blood introduced into the centrifuge being larger than the target processed blood volume by at least a second predetermined amount, wherein the second predetermined amount is greater than zero;

directing a fluid flow out of the second port of the centrifuge and into a first container, wherein the fluid flow comprises buffy coat from the buffy coat layer, wherein the directing a fluid flow step is initiated in response to the blood processing system having identified an existence of either the first condition or the second condition, wherein each of the first monitoring step, the second monitoring step and the directing a fluid flow step are executed by the blood processing system;

executing a third monitoring step comprising monitoring a hematocrit of an initial portion of the fluid flow from the directing step;

determining a hematocrit offset value from the initial portion of the fluid flow; and

assessing the fluid flow for at least part of the directing a fluid flow step using the hematocrit offset value, wherein the at part of the directing a fluid flow step is after the initial portion, wherein the third monitoring step, the determining step, and the assessing step are all executed by the blood processing system.

2 . The method of claim 1 , wherein the first monitoring step is executed using a bowl optic sensor.

3 . The method of claim 1 , wherein the first predetermined amount is 75 ml.

4 . The method of claim 1 , wherein the first predetermined amount is a fixed amount that is independent of a magnitude of the target processed blood volume.

5 . The method of claim 1 , wherein the second predetermined amount is 75 ml.

6 . The method of claim 1 , wherein the determining step comprises using an output of a hematocrit sensor associated with a fluid line extending between the centrifuge and the first container.

7 . The method of claim 1 , wherein the initial portion of the fluid flow comprises introducing a predetermined fluid amount into the first container.

8 . The method of claim 7 , wherein the predetermined fluid amount is 10 ml.

9 . The method of claim 1 , wherein the assessing step comprises comparing a current hematocrit value of the fluid flow from the directing a fluid flow step to a hematocrit threshold, wherein the hematocrit threshold is an amount corresponding to the sum of the hematocrit offset value and a predetermined percentage.

10 . The method of claim 9 , wherein the predetermined percentage is 5%.

11 . The method of claim 9 , further comprising:

suspending the directing a fluid flow step based upon the assessing step, wherein the suspending step is initiated when the current hematocrit value of the fluid flow from the directing step satisfies the hematocrit threshold.

12 . The method of claim 11 , wherein satisfaction of the hematocrit threshold comprises the current hematocrit value being equal to or greater than the hematocrit threshold.

13 . The method of claim 11 , wherein the directing a fluid flow step is based upon a continued execution of the introducing blood prior to the suspending step, and wherein the directing a fluid flow step is based upon directing a flow of red blood cells into the centrifuge through the third port after the suspending step.

14 . The method of claim 1 , further comprising using a disposable kit, wherein the disposable kit comprises the centrifuge and the first container.

15 . The method of claim 1 , further comprising:

terminating the directing a fluid flow step; and

subjecting contents of the first container to photo therapy after the terminating step.

16 . The method of claim 1 , further comprising:

the blood processing system receiving user input that activates a blood prime function of the blood processing system, wherein the introducing blood step comprises introducing donor blood into the centrifuge, followed by introducing patient blood into the centrifuge, wherein the blood prime operation comprises the introducing donor blood step.

17 . The method of claim 16 , wherein the blood processing system comprises a return bag.

18 . The method of claim 17 , wherein the blood processing system is configured to preclude transferring contents of the return bag back to a patient at any time during the directing a fluid flow step and when the blood prime function has been activated.

19 . The method of claim 17 , further comprising:

photo-activating contents of the first container, wherein the blood processing system is configured to preclude transferring contents of the return bag back to a patient at any time during the photo-activating step and when the blood prime function has been activated.

20 . The method of claim 19 , further comprising:

the blood processing system receiving user input on a rinseback volume; and

reinfusing contents of the first container back to a patient, wherein the blood processing system is configured to transfer the rinseback volume from the return bag back to the patient only after a termination of the photo-activating step, only after a completion of an entirety of the reinfusing step, and when the blood prime function has been activated.

21 . A blood processing system configured to execute the method of claim 1 .

22 . A photopheresis system configured to execute the method of claim 1 , wherein the blood processing system is the photopheresis system.

23 . A method of operating a blood processing system, wherein the blood processing system comprises a centrifuge, and wherein the centrifuge comprises a first port and a second port, the method comprising:

introducing blood into the centrifuge through the first port;

separating the blood into a plasma layer, a buffy coat layer, and a red blood cell layer within the centrifuge and by rotating the centrifuge;

directing a fluid flow out of the second port of the centrifuge and into a first container, wherein the fluid flow comprises buffy coat from the buffy coat layer;

executing, by one or more processors, a first monitoring step comprising monitoring a hematocrit of an initial portion of the fluid flow;

determining, by the one or more processors, a hematocrit offset value from the initial portion of the fluid flow; and

assessing, by the one or more processors, the fluid flow for at least part of the directing step using the hematocrit offset value.

Assignments (8)