US 12,392,335 B2
Medical fluid pumping system having backflow prevention
Troy J. Orr, Draper, UT (US)
Assigned to Baxter International Inc., Deerfield, IL (US); and Baxter Healthcare SA, Glattpark (CH)
Filed by BAXTER INTERNATIONAL INC., Deerfield, IL (US); and BAXTER HEALTHCARE SA, Glattpark (CH)
Filed on Jun. 8, 2022, as Appl. No. 17/835,500.
Application 17/835,500 is a continuation of application No. 16/355,170, filed on Mar. 15, 2019, granted, now 11,384,748.
Application 16/355,170 is a continuation of application No. 14/558,021, filed on Dec. 2, 2014, granted, now 10,670,005.
Application 14/558,021 is a continuation of application No. 13/472,099, filed on May 15, 2012, granted, now 8,932,032, issued on Jan. 13, 2015.
Application 13/472,099 is a continuation of application No. 11/945,177, filed on Nov. 26, 2007, granted, now 8,197,231, issued on Jun. 12, 2012.
Application 11/945,177 is a continuation in part of application No. 11/484,061, filed on Jul. 11, 2006, granted, now 7,717,682, issued on May 18, 2010.
Claims priority of provisional application 60/699,262, filed on Jul. 13, 2005.
Prior Publication US 2022/0299019 A1, Sep. 22, 2022
Int. Cl. F04B 43/06 (2006.01); A61M 1/14 (2006.01); A61M 5/142 (2006.01); A61M 60/113 (2021.01); A61N 5/10 (2006.01); F04B 7/02 (2006.01); F04B 23/04 (2006.01); F04B 43/073 (2006.01); F04B 45/04 (2006.01); F04B 45/053 (2006.01)
CPC F04B 43/06 (2013.01) [A61M 1/14 (2013.01); A61M 5/14224 (2013.01); A61M 60/113 (2021.01); F04B 7/0275 (2013.01); F04B 23/04 (2013.01); F04B 43/0736 (2013.01); F04B 45/043 (2013.01); F04B 45/0536 (2013.01); A61N 2005/1021 (2013.01); F04B 2201/0601 (2013.01); F04B 2201/0605 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A medical fluid pumping system comprising:
a medical fluid pump for pumping a process fluid, the medical fluid pump including
a first pump chamber,
a first inlet valve chamber in fluid communication with the first pump chamber, the first inlet valve chamber including a first inlet valve diaphragm,
a first outlet valve chamber in fluid communication with the first pump chamber,
a second pump chamber,
a second inlet valve chamber in fluid communication with the second pump chamber, the second inlet valve chamber including a second inlet valve diaphragm,
a second outlet valve chamber in fluid communication with the second pump chamber,
a first valve seal separate from the first inlet valve diaphragm and configured to compress the first inlet valve diaphragm around the first inlet valve chamber, wherein the first valve seal comprises an o-ring configured to fit into a groove surrounding the first inlet valve chamber, and
a second valve seal separate from the second inlet valve diaphragm and configured to compress the second inlet valve diaphragm around the second inlet valve chamber, wherein the second valve seal comprises an o-ring configured to fit into a groove surrounding the second inlet valve chamber; and
a medical fluid chassis operable with the medical fluid pump, the medical fluid chassis including a motive fluid source providing a motive fluid at a motive fluid pressure, wherein the first and second inlet valve diaphragms are configured to actuate from an open position to a closed position at a differential pressure less than the motive fluid pressure to mitigate a process fluid backflow through the first and second inlet valve chambers.