Patent ID: 11865243
Assignee: NXSTAGE MEDICAL, INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 20:
21. 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 a venous line for conveying blood to a patient and an arterial line for conveying the blood from the patient;
a treatment device configured to treat the blood and having an inlet port and an outlet port, the inlet port of the treatment device fluidly connected to the arterial line and the outlet port of the treatment device fluidly connected to the venous line;
at least two pressure sensors in the venous line or in the arterial line, with two pressure sensors of the at least two pressure sensors being in a same line and a flow restriction that causes a pressure drop from upstream to downstream of the flow restriction; and
a controller configured to control the one or more pumps to convey blood to and from the patient, the controller further configured to use readings of the at least two pressure sensors to determine a change over time in a pressure drop across the flow restriction and to perform an action responsive to the change in the pressure drop, the action comprising at least one of:
generating a notification,
adjusting a blood flow rate in the blood circuit,
outputting an estimation of a condition of the machine or the patient, or
outputting data responsive to said estimation,
wherein the controller is configured to sample the pressure drop at multiple times over a period of time comprising a single treatment or multiple treatments and store data responsive thereto, wherein the change in the pressure drop is determined based on a trend over time of the stored data.