Control of pulsatile rotary pumps without pressure sensors.
When ventricular assistance is achieved with a volumetric pump driven by an electric actuator, overpumping can cause venous collapse. To prevent this problem, pump speed must be monitored and controlled. The authors developed a regulatory system based on the current intensity signal from the electric motor. This signal is processed and compared with predicted values calculated according to a mathematical model at the beginning of each ejection phase. If a difference is detected, pump speed is adequately adjusted. The great advantage of this system is elimination of the need for an implantable pressure sensor. It requires a simple and ubiquitous electronic component, i.e., a resistor, that can be easily integrated into the motor control circuit and does not require calibration.
Trinkl
J
J
Teracor Sarl, Toulon, France.
Mesana
T
T
Havlik
P
P
Mitsui
N
N
Demunck
J L
JL
Dion
I
I
Candelon
B
B
Montiès
J R
JR
D000818:Animals; D015924:Blood Pressure Monitors; D002417:Cattle; D006353:Heart-Assist Devices; D006439:Hemodynamics / Q000502:physiology; D006801:Humans; D011474:Prosthesis Design; D011673:Pulsatile Flow