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US 2026/0091165 A1Published application
Apparatus for extracorporeal treatment of blood and method for determining water losses in a membrane gas exchanger of an apparatus for extracorporeal treatment of blood
AssigneeGambro Lundia AB
InventorDominique Pouchoulin
Life of this patent
Estimating the term…
Abstract
A method for determining water losses in a membrane gas exchanger of an apparatus for extracorporeal treatment of blood, comprises: obtaining a sweep gas flow rate (Qgas) in a gas side of a membrane gas exchanger (19); obtaining a water saturation content (Csaturation_out) at a gas outlet (19d) of the membrane gas exchanger (19); calculating the water losses (Qeccor) as a function at least of the sweep gas flow rate (Qgas) and the water saturation content (Csaturation_out).
Claims21
1-40. (canceled)
An apparatus for extracorporeal treatment of blood comprising:
- an extracorporeal blood circuit;
- a blood pump configured to be coupled to a pump section of the extracorporeal blood circuit;
- a membrane gas exchanger operatively coupled to the extracorporeal blood circuit to exchange gas with blood flowing in the extracorporeal blood circuit, wherein the membrane gas exchanger comprises a blood side having a blood inlet and a blood outlet in fluid communication with the extracorporeal blood circuit and a gas side having a gas inlet and a gas outlet, wherein the membrane gas exchanger comprises a gas permeable membrane separating the blood side and gas side;
- wherein the gas inlet is configured to receive sweep gas from a sweep gas source connected to the gas inlet to feed sweep gas through the gas side of the membrane gas exchanger;
- the extracorporeal blood circuit comprising a blood withdrawal line connected to the blood inlet of the membrane gas exchanger and a blood return line connected to the blood outlet of the membrane gas exchanger;
- a control unit operably connected to the blood pump, the control unit configured to:
- operate the blood pump to pass blood through the blood side of the membrane gas exchanger to exchange gas between the blood flowing through the blood side of the membrane gas exchanger and the sweep gas flowing through the gas side of the membrane gas exchanger;
- determine blood water losses occurring in the membrane gas exchanger due to gas exchange;
- issue a signal informing of the blood water losses.
6 more elements
The apparatus according to claim 5, wherein obtaining the relative humidity at the gas outlet comprises:
- deriving the relative humidity at the gas outlet from the type of the membrane gas exchanger and of the sweep gas flow rate;
- or
- assuming the relative humidity at the gas outlet equal to 100%;
An apparatus for extracorporeal treatment of blood comprising:
- a blood treatment unit comprising a primary chamber and a secondary chamber separated by a semi-permeable membrane, wherein the blood withdrawal line is connected to an inlet of the primary chamber and the blood return line is connected to an outlet of the primary chamber;
- an extracorporeal blood circuit coupled to the blood treatment unit;
- a blood pump configured to be coupled to a pump section of the extracorporeal blood circuit;
- a fluid circuit coupled to the blood treatment unit, wherein the fluid circuit is connected to the secondary chamber and comprises an effluent fluid line connected to an outlet of the secondary chamber and a dialysis fluid line connected to an inlet of the secondary chamber;
- in at least one configuration, the fluid circuit presents a closed loop connected to the secondary chamber;
- a membrane gas exchanger operatively coupled to the fluid circuit to exchange gas with fluid flowing in the fluid circuit, wherein the membrane gas exchanger comprises a fluid side having a fluid inlet and a fluid outlet in fluid communication with the fluid circuit and a gas side crossed by a sweep gas and having a gas inlet and a gas outlet;
- a control unit operably connected to the blood pump, the control unit configured to:
- operate the blood pump to pass blood through the blood side of the membrane gas exchanger while exchanging gas between the fluid flowing through the fluid side of the membrane gas exchanger and the sweep gas flowing through the gas side of the membrane gas exchanger;
- determine fluid water losses occurring in the membrane gas exchanger due to gas exchange;
- issue a signal informing of the fluid water losses.
7 more elements
An apparatus for extracorporeal treatment of blood comprising:
- an extracorporeal blood circuit;
- a blood pump configured to be coupled to a pump section of the extracorporeal blood circuit;
- a membrane gas exchanger operatively coupled to the extracorporeal blood circuit to exchange gas with blood flowing in the extracorporeal blood circuit, wherein the membrane gas exchanger comprises a blood side having a blood inlet and a blood outlet in fluid communication with the extracorporeal blood circuit and a gas side crossed by a sweep gas and having a gas inlet and a gas outlet;
- a control unit operably connected to the blood pump, the control unit configured to:
- operate the blood pump to pass blood through the blood side of the membrane gas exchanger to exchange gas between the blood flowing through the blood side of the membrane gas exchanger and the sweep gas flowing through the gas side of the membrane gas exchanger;
- determine blood water losses occurring in the membrane gas exchanger due to gas exchange, wherein determining the blood water losses comprises:
- obtaining a sweep gas flow rate in the gas side of the membrane gas exchanger;
- obtaining a blood inlet temperature at the blood inlet of the membrane gas exchanger;
- obtaining a room temperature of the sweep gas;
- calculate the blood water losses as a function at least of the sweep gas flow rate, the blood inlet temperature and the room temperature;
- issue a signal informing of the blood water losses.
8 more elements
Dependencies are inferred from the claim text.