US 9,808,567 B2
Diaphragm repositioning for pressure pod using position sensing
John O'Mahony, Maple Grove, MN (US)
Assigned to Gambro Lundia AB, Lund (SE)
Appl. No. 14/649,612
Filed by GAMBRO LUNDIA AB, Lund (SE)
PCT Filed Dec. 13, 2013, PCT No. PCT/US2013/075057
§ 371(c)(1), (2) Date Jun. 4, 2015,
PCT Pub. No. WO2014/093846, PCT Pub. Date Jun. 19, 2014.
Claims priority of provisional application 61/737,264, filed on Dec. 14, 2012.
Prior Publication US 2015/0314058 A1, Nov. 5, 2015
Int. Cl. G01L 7/08 (2006.01); A61M 1/36 (2006.01); F04B 45/053 (2006.01); F04B 49/00 (2006.01); G01B 11/14 (2006.01); G01B 7/00 (2006.01); G01L 19/00 (2006.01); G01L 11/00 (2006.01); G01L 19/14 (2006.01)
CPC A61M 1/3639 (2013.01) [A61M 1/3641 (2014.02); F04B 45/0536 (2013.01); F04B 49/002 (2013.01); G01B 7/003 (2013.01); G01B 11/14 (2013.01); G01L 7/088 (2013.01); G01L 11/004 (2013.01); G01L 19/0023 (2013.01); G01L 19/0038 (2013.01); G01L 19/0046 (2013.01); G01L 19/144 (2013.01); A61M 2205/3331 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An extracorporeal treatment system including a pressure measurement system comprising:
a pressure pod body comprising at least a pod body portion and a base body portion;
a diaphragm separating a liquid side cavity defined at least in part by the pod body portion from a transducer side cavity defined at least in part by the base body portion, wherein the liquid side cavity is in fluid communication with an inlet and an outlet, and further wherein the diaphragm is displaceable from a centered measuring position into the liquid side cavity towards the pod body portion and is displaceable from the centered measuring position into the transducer side cavity towards the base body portion;
a pressure transducer operatively coupled to the transducer side cavity such that pressure of liquid when present in the liquid side cavity is transferred to the transducer side cavity via the diaphragm and measureable by the pressure transducer;
a position sensor to sense the position of the diaphragm;
a controller operatively coupled to the position sensor to receive one or more signals representative of the position of the diaphragm and to generate a control signal based thereon for use in repositioning the diaphragm towards the centered measuring position; and
pump apparatus operatively coupled to the controller and the transducer side cavity to reposition the diaphragm to the centered measuring position based on the control signal generated by the controller.