US 12,318,527 B2
Control of fluid flow during priming of a fluid flow circuit
Jeffrey R Maher, Schaumburg, IL (US); Jonathan W. Prendergast, Palatine, IL (US); Brian C. Case, Lake Villa, IL (US); Steven R Katz, Deerfield, IL (US); Robert Crampton, Gurnee, IL (US); and Ryan DeLacey, Wheaton, IL (US)
Assigned to Fenwal, Inc., Lake Zurich, IL (US)
Filed by Fenwal, Inc., Lake Zurich, IL (US)
Filed on Aug. 16, 2022, as Appl. No. 17/888,546.
Claims priority of provisional application 63/234,276, filed on Aug. 18, 2021.
Prior Publication US 2023/0055028 A1, Feb. 23, 2023
Int. Cl. A61M 1/36 (2006.01); A61M 1/02 (2006.01); A61M 60/113 (2021.01); A61M 60/279 (2021.01); A61M 60/39 (2021.01); A61M 60/554 (2021.01)
CPC A61M 1/3644 (2014.02) [A61M 1/0259 (2013.01); A61M 60/113 (2021.01); A61M 60/279 (2021.01); A61M 60/39 (2021.01); A61M 60/554 (2021.01); A61M 1/0272 (2013.01); A61M 2205/3331 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A fluid processing device configured for use in combination with a fluid flow circuit, the fluid processing device comprising:
a pump;
a pressure sensor; and
a controller, wherein the controller is configured to execute a priming procedure including
controlling the pump to operate at a current rate for a predetermined time interval to convey a priming fluid through at least a portion of the fluid flow circuit,
controlling the pressure sensor to measure a pressure in a conduit of the fluid flow circuit,
comparing of the pressure to of a predetermined pressure at the end of the predetermined time interval, and
when of the pressure is less than the predetermined pressure at the end of the predetermined time interval, controlling the pump to operate at an increased rate that is greater than the current rate, and
when the pressure is not less than the predetermined pressure at the end of the predetermined time interval, controlling the pump to operate at a decreased rate that is less than the current rate, wherein
if the pump has not been operated at a previous rate during the priming procedure wherein the pressure was less than the predetermined pressure at the end of a previous time interval during which the pump was operated at said previous rate, the decreased rate is equal to a predetermined safe rate, and
if the pump has been operated at at least one previous rate during the priming procedure wherein the pressure was less than the predetermined pressure at the end of a previous time interval when the pump was operated at said at least one previous rate, the decreased rate is equal to the previous rate at which the pump most recently operated at during the priming procedure when the pressure was less than the predetermined pressure at the end of said previous time interval when the pump was operated at said at least one previous rate.