Condition responsive pump control utilizing integrated, commanded, and sensed flowrate signals
First Claim
1. Pump control apparatus comprisinga variable flowrate pump including an electric motor controllable in response to a pump drive signal,a signal generator generating a commanded flowrate signal indicating desired flowrate of said pump,a flowrate sensor providing a sensed flowrate signal indicating sensed flowrate of said pump, andan integrator connected to said sensor and generator to receive and integrate said commanded flowrate signal and said sensed flowrate signal, said integrator maintaining an electrical signal representing the difference over time in volume commanded to be pumped and the volume pumped, said integrator providing said pump drive signal based on said electrical signal, said pump drive signal being increased based on said commanded flowrate signal, thereby increasing the speed of said motor, and being decreased based on said sensed flowrate signal, thereby decreasing the speed of said motor, so as to achieve desired commanded volume over time.
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Abstract
A pump control apparatus including a variable speed pump controllable in response to a pump drive signal, a signal generator generating a commanded flowrate signal indicating desired flowrate of the pump, a flowrate sensor providing a sensed flowrate signal indicating sensed flowrate of the pump, and an integrator connected to the sensor and generator to receive and integrate the commanded flowrate signal and the sensed flowrate signal and to provide the pump drive signal based on the difference in integrated values of the signals so as to achieve desired commanded volume over time.
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Citations
20 Claims
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1. Pump control apparatus comprising
a variable flowrate pump including an electric motor controllable in response to a pump drive signal, a signal generator generating a commanded flowrate signal indicating desired flowrate of said pump, a flowrate sensor providing a sensed flowrate signal indicating sensed flowrate of said pump, and an integrator connected to said sensor and generator to receive and integrate said commanded flowrate signal and said sensed flowrate signal, said integrator maintaining an electrical signal representing the difference over time in volume commanded to be pumped and the volume pumped, said integrator providing said pump drive signal based on said electrical signal, said pump drive signal being increased based on said commanded flowrate signal, thereby increasing the speed of said motor, and being decreased based on said sensed flowrate signal, thereby decreasing the speed of said motor, so as to achieve desired commanded volume over time.
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19. Medical apparatus comprising
a variable flowrate peristaltic pump including an electric motor controllable in response to a pump drive signal, a signal generator generating a commanded flowrate signal indicating desired flowrate of said pump, a flowrate sensor providing a sensed flowrate signal indicating sensed flowrate of said pump, and an integrator connected to said sensor and generator to receive and integrate said commanded flowrate signal and said sensed flowrate signal, said integrator maintaining an electrical signal representing the difference over time in volume commanded to be pumped and the volume pumped, said integrator providing said pump drive signal based on said electrical signal, said pump drive signal being increased based on said commanded flowrate signal, thereby increasing the speed of said motor, and being decreased based on said sensed flowrate signal, thereby decreasing the speed of said motor, so as to achieve desired commanded volume over time.
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20. Blood centrifuge apparatus comprising
a centrifuge having a blood inflow line and a plurality of output lines for separated fractions of blood, a plurality of variable flowrate peristaltic pumps acting upon at least some of said lines, each said pump including an electric motor controllable in response to a pump drive signal, said apparatus further comprising, for each said pump, a signal generator generating a commanded flowrate signal indicating desired flowrate of said pump, a flowrate sensor providing a sensed flowrate signal indicating sensed flowrate of said pump, and an integrator connected to said sensor and generator to receive and integrate said commanded flowrate signal and said sensed flowrate signal, said integrator maintaining an electrical signal representing the difference over time in volume commanded to be pumped and the volume pumped, said integrator providing said pump drive signal based on said electrical signal, said pump drive signal being increased based on said commanded flowrate signal, thereby increasing the speed of said motor, and being decreased based on said sensed flowrate signal, thereby decreasing the speed of said motor, so as to achieve desired commanded volume over time.
Specification