US 11,998,673 B1
Extracorporeal blood filtering machine and methods
Vitaliy Gennad'yevich Epshteyn, Maple Grove, MN (US); Steven Daniel Sandoval, Eden Prairie, MN (US); Kalley Francis Berg, Lino Lakes, MN (US); and Franz Willems Ulrich, Minneapolis, MN (US)
Assigned to NUWELLIS, INC., Eden Prairie, MN (US)
Filed by Nuwellis, Inc., Eden Prairie, MN (US)
Filed on Feb. 20, 2023, as Appl. No. 18/171,640.
Application 18/171,640 is a continuation of application No. 18/171,612, filed on Feb. 20, 2023.
Int. Cl. A61M 1/34 (2006.01); A61M 1/14 (2006.01); A61M 1/36 (2006.01); A61M 60/109 (2021.01); A61M 60/268 (2021.01)
CPC A61M 1/34 (2013.01) [A61M 1/14 (2013.01); A61M 1/154 (2022.05); A61M 1/155 (2022.05); A61M 1/1562 (2022.05); A61M 1/15632 (2022.05); A61M 1/1566 (2022.05); A61M 1/341 (2014.02); A61M 1/3413 (2013.01); A61M 1/342 (2013.01); A61M 1/3424 (2014.02); A61M 1/3434 (2014.02); A61M 1/3437 (2014.02); A61M 1/3441 (2013.01); A61M 1/3444 (2014.02); A61M 1/3451 (2014.02); A61M 1/3607 (2014.02); A61M 1/36224 (2022.05); A61M 1/36225 (2022.05); A61M 1/362262 (2022.05); A61M 1/362264 (2022.05); A61M 1/362266 (2022.05); A61M 1/3624 (2013.01); A61M 1/3663 (2013.01); A61M 60/109 (2021.01); A61M 60/268 (2021.01)] 12 Claims
OG exemplary drawing
 
1. An extracorporeal blood filtering machine comprising:
a blood circuit that includes:
a blood line comprising a blood inlet configured to receive blood from a patient and a blood outlet configured to return the blood to the patient,
a filter fluidly connected to the blood line between the blood inlet and the blood outlet, and
a blood pump configured to pump the blood at a blood pump speed from the blood inlet to the blood outlet through the filter, the filter configured to remove waste from the blood;
a source fluid circuit that includes:
a source fluid line fluidly connected to a source fluid reservoir and configured to be connected to the blood circuit, and
a source fluid pump configured to pump source fluid at a source fluid pump speed from the source fluid reservoir through the source fluid line into the blood circuit;
an effluent circuit that includes:
an effluent line fluidly connected to the filter, the effluent line configured to receive the waste from the filter in the form of effluent, and
an effluent pump configured to pump the effluent at an effluent pump speed from the filter through the effluent line into an effluent receptacle;
a source fluid flow sensor configured to measure a source fluid flow quantity;
an effluent flow sensor configured to measure an effluent flow quantity; and
a controller in communication with the blood pump, the source fluid pump, and the effluent pump, the controller configured to operate the extracorporeal blood filtering machine in an open-loop mode or in a closed-loop mode, the controller setting the blood pump speed, the source fluid pump speed, and the effluent pump speed at respective fixed speeds in the open-loop mode, the controller adjusting the source fluid pump speed based on the source fluid flow quantity in the closed-loop mode, and the controller adjusting the effluent pump speed based on the effluent flow quantity in the closed-loop mode,
wherein the effluent receptacle comprises a drain when the controller is operating the extracorporeal blood filtering machine in the open-loop mode, and the effluent receptacle comprises a bag when the controller is operating the extracorporeal blood filtering machine in the closed-loop mode.