US 12,280,190 B2
Fluid warming device for an extracorporeal blood treatment apparatus and method for detecting a fluid temperature at an outlet of a fluid warming device for an extracorporeal blood treatment apparatus
Dominique Pouchoulin, Tramoyes (FR); and Alexander Cain, Minneapolis, MN (US)
Assigned to GAMBRO LUNDIA AB, Lund (SE)
Appl. No. 17/283,739
Filed by GAMBRO LUNDIA AB, Lund (SE)
PCT Filed Oct. 3, 2019, PCT No. PCT/EP2019/076809
§ 371(c)(1), (2) Date Apr. 8, 2021,
PCT Pub. No. WO2020/074357, PCT Pub. Date Apr. 16, 2020.
Claims priority of application No. 18199718 (EP), filed on Oct. 10, 2018.
Prior Publication US 2021/0379257 A1, Dec. 9, 2021
Int. Cl. A61M 1/16 (2006.01); A61M 1/36 (2006.01)
CPC A61M 1/1664 (2014.02) [A61M 1/36223 (2022.05); A61M 2205/127 (2013.01); A61M 2205/3372 (2013.01); A61M 2205/3653 (2013.01); A61M 2205/50 (2013.01)] 14 Claims
OG exemplary drawing
 
1. Fluid warming device for an extracorporeal blood treatment apparatus, the fluid warming device comprising:
a casing defining a heating zone configured to accommodate a fluid warming path, wherein the fluid warming path is defined by a fluid warming bag or a cassette comprising an inlet and an outlet configured for fluid connection to an extracorporeal blood treatment apparatus, wherein the casing delimits a heating seat configured to accommodate the fluid warming bag or the cassette;
heating elements operatively active in the heating zone, the heating elements configured to heat the fluid warming path and comprising two opposite heating plates delimiting the heating seat to heat the fluid warming bag or cassette, the fluid warming device comprising a plurality of heating element temperature sensors coupled to the two opposite heating plates and located along the fluid warming path to detect a measured temperature of the two opposite heating plates;
an outlet temperature sensor operatively active at the outlet of the fluid warming path and configured to convey a measured outlet temperature of a fluid leaving the fluid warming device;
an inlet temperature sensor operatively active at the inlet of the fluid warming path and configured to detect a measured inlet temperature of the fluid entering the fluid warming device;
a compensation temperature sensor located between the outlet temperature sensor and the heating element and configured to detect a measured temperature of a part of the fluid warming device; and
an electronic control unit operatively connected to the outlet temperature sensor, the inlet temperature sensor, the plurality of heating element temperature sensors, the compensation temperature sensor, and the heating elements, wherein the electronic control unit is configured to:
receive from the inlet temperature sensor a signal correlated to the measured inlet temperature;
receive from one or more of the plurality of heating element temperature sensors a signal correlated to the measured temperature of one heating element of the plurality of heating elements;
receive from the compensation temperature sensor a signal correlated to the measured temperature of the part of the fluid warming device;
receive, from the outlet temperature sensor a signal correlated to the measured outlet temperature;
correct the measured outlet temperature using a correction model to obtain an actual fluid outlet temperature and calculate an actual fluid outlet temperature from the measured outlet temperature and from at least one of: the measured inlet temperature, the measured temperature of the heating element, and the measured temperature of the part of the fluid warming device;
adjust a heating power of the heating elements to keep the actual fluid outlet temperature at a set reference temperature;
wherein the correction model is based at least in part on a measurement error, the measurement error being a difference between the measured outlet temperature and the actual fluid outlet temperature.