초록 ▼

Blood flow rate in a motor driven centrifugal blood pump is measured indirectly and non-invasively by sensing a first parameter representative of pump RPM and a second parameter representative of motor torque. The blood flow rate is computed as a function of the first and second parameters. By measu

Blood flow rate in a motor driven centrifugal blood pump is measured indirectly and non-invasively by sensing a first parameter representative of pump RPM and a second parameter representative of motor torque. The blood flow rate is computed as a function of the first and second parameters. By measuring the second parameter in a zero flow condition while the motor is being driven at a known RPM, a viscosity calibration factor is determined which is used, together with the first and second parameters in the calculation of flow rate.

대표청구항 ▼

A method of indirectly and noninvasively measuring blood flow in an outlet line connected to a motor driven centrifugal blood pump of a type having an inlet, and outlet connected to the outlet line, a housing, and an impeller which is rotated by the motor to pump blood from the inlet to the outlet,

A method of indirectly and noninvasively measuring blood flow in an outlet line connected to a motor driven centrifugal blood pump of a type having an inlet, and outlet connected to the outlet line, a housing, and an impeller which is rotated by the motor to pump blood from the inlet to the outlet, the method comprising: sensing a first parameter to provide a first signal representative of pump impeller RPM; sensing a second parameter to provide a second signal representative of motor torque; computing a blood flow rate in the outlet line as a function of the first and second signals; and displaying a representation of the blood flow in the outlet line.