US 12,226,557 B2
Flow balancing devices, methods, and systems
Jeffrey H. Burbank, Manchester, MA (US); Dennis M. Treu, Castle Rock, CO (US); Daniel Joseph Rubery, Jr., Nashua, NH (US); Scott W. Newell, Ipswich, MA (US); James M. Brugger, Newburyport, MA (US); William J. Schnell, Libertyville, IL (US); William K. Weigel, Portland, ME (US); Steven A. White, Hudson, MA (US); Mark T. Wyeth, Andover, MA (US); Jerome James, Vestavia, AL (US); David Desouza, Essex, MA (US); Joseph E. Turk, Jr., North Andover, MA (US); and Garrett Casey, Methuen, MA (US)
Assigned to NxStage Medical, Inc., Lawrence, MA (US)
Filed by NxStage Medical, Inc., Lawrence, MA (US)
Filed on Nov. 14, 2023, as Appl. No. 18/508,533.
Application 18/508,533 is a continuation of application No. 17/879,455, filed on Aug. 2, 2022, granted, now 11,850,341.
Application 17/879,455 is a continuation of application No. 17/097,724, filed on Nov. 13, 2020, granted, now 11,406,744, issued on Aug. 9, 2022.
Application 17/097,724 is a continuation of application No. 16/381,363, filed on Apr. 11, 2019, granted, now 10,869,958, issued on Dec. 22, 2020.
Application 16/381,363 is a continuation of application No. 15/517,928, granted, now 10,525,182, issued on Jan. 7, 2020, previously published as PCT/US2015/055031, filed on Oct. 9, 2015.
Claims priority of provisional application 62/152,057, filed on Apr. 24, 2015.
Claims priority of provisional application 62/062,764, filed on Oct. 10, 2014.
Prior Publication US 2024/0075191 A1, Mar. 7, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. A61M 1/14 (2006.01); A61M 1/16 (2006.01); A61M 1/34 (2006.01); A61M 1/36 (2006.01)
CPC A61M 1/1605 (2014.02) [A61M 1/14 (2013.01); A61M 1/1613 (2014.02); A61M 1/1615 (2014.02); A61M 1/1647 (2014.02); A61M 1/165 (2014.02); A61M 1/34 (2013.01); A61M 1/3403 (2014.02); A61M 1/341 (2014.02); A61M 1/3434 (2014.02); A61M 1/3437 (2014.02); A61M 1/3441 (2013.01); A61M 1/3444 (2014.02); A61M 1/3448 (2014.02); A61M 1/3607 (2014.02); A61M 1/3609 (2014.02); A61M 1/3635 (2014.02); A61M 2205/05 (2013.01); A61M 2205/058 (2013.01); A61M 2205/15 (2013.01); A61M 2205/3331 (2013.01); A61M 2205/3334 (2013.01); A61M 2205/3341 (2013.01); A61M 2205/3351 (2013.01); A61M 2205/3355 (2013.01); A61M 2205/3365 (2013.01); A61M 2205/3368 (2013.01); A61M 2205/502 (2013.01); A61M 2205/702 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A system for performing a medical treatment, the system comprising:
a controller;
one or more controllable valve actuators;
a first pump;
a second pump, wherein the controllable valve actuators, the first pump and the second pump are controlled by the controller;
the first pump being controlled to regulate a flow toward a patient interface device and the second pump a being controlled to regulate a flow from the same patient interface device;
the patient interface device being a device that is separate from the system and interfaces with a patient fluid compartment including at least one of a dialyzer, a hemofilter, a hemodiafilter, an ultrafilter, and a plasmapheresis device;
the controller being configured to regulate a speed of the first and second pumps to achieve a predefined net removal of fluid from the patient interface device during a treatment interval;
the controller being further configured to control the control valve actuators to switch between a first position that configures a fluid circuit, when attached to said controllable valve actuators, in a bypass configuration which defines a bypass flow path that bypasses the patient interface device, and a second position which defines a flow path into and out of the patient interface device;
a pressure transducer connected to convey pressure signals to the controller, the pressure signals indicating pressure in the bypass flow path;
the controller being programmed to calculate and store flow correction data representing a correction to be applied to a rate of flow of said at least one of the first and second pumps responsively to said pressure signals; and
the controller being further programmed to modify a flow rate of said at least one of the first and second pumps responsively to said flow correction data, wherein
the system further comprises a third pump that pumps fluid into the patient interface device during a treatment, the third pump being coupled to a synchronization mechanism that causes the first and third pumps to pump equal amounts of fluid per unit time during the medical treatment.