Parameter Monitoring in Medical Treatment Systems
AssigneeNxStage Medical, Inc.
InventorsMark T. WYETH, Robert Paul MCCARTY, Gregory YANTZ, James Ian JOHNSON, Joseph E. TURK, JR., James M. BRUGGER, Jeffrey H. BURBANK
Life of this patent
Estimating the term…
Abstract
A blood treatment system with pressure sensors may be configured to control blood flow to and from the patient and use readings of the pressure sensors to determine a change in a pressure drop across a flow restriction in the blood circuit to estimate a condition of the machine or the patient, or outputting data responsive to the estimation. Further embodiments employ measurement of pressure drop to detect abnormal viscosity or viscosity variations in order to detect possible infection.
Claims15
A blood treatment system, comprising:
- a machine comprising one or more pumps;
- a blood circuit in engagement with the one or more pumps and having an inlet line and an outlet line for conveying blood to and from a patient, respectively;
- and
- a controller configured to control the one or more pumps to convey the blood to and from the patient, the controller further configured to reduce or halt an ultrafiltration rate of the blood treatment system and determine a resulting change in a blood viscosity-dependent parameter in the blood circuit, the controller further configured to use the resulting change in the blood viscosity-dependent parameter to determine whether to remove more fluid volume from the patient.
A blood treatment system, comprising:
- a machine comprising one or more pumps;
- a blood circuit in engagement with the one or more pumps and having an inlet line and an outlet line for conveying blood to and from a patient, respectively;
- and
- a controller configured to control the one or more pumps to convey the blood to and from the patient, the controller further configured to determine a first blood viscosity-dependent parameter in the inlet line and a second blood viscosity-dependent parameter in the outlet line, the controller further configured to estimate an ultrafiltration rate of the blood treatment system by comparing the first blood viscosity-dependent parameter with the second blood viscosity-dependent parameter and perform a function responsive to the estimate of the ultrafiltration rate, the function comprising at least one of:
- generating a notification, adjusting a flow rate of the blood in the blood circuit, or outputting data responsive to said estimate.
A method comprising:
- controlling one or more pumps of a machine by a controller of a blood treatment system to convey blood to and from a patient via a blood circuit in engagement with the one or more pumps and having an inlet line and an outlet line for conveying the blood to and from the patient, respectively;
- determining a first blood viscosity-dependent parameter in the inlet line and a second blood viscosity-dependent parameter in the outlet line;
- estimating an ultrafiltration rate of the blood treatment system by comparing the first blood viscosity-dependent parameter with the second blood viscosity-dependent parameter;
- and
- performing a function responsive to said estimate of the ultrafiltration rate, the function comprising at least one of:
- generating a notification, adjusting a flow rate of the blood in the blood circuit, or outputting data responsive to said estimate.
Dependencies are inferred from the claim text.