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US 8,556,795 B2Granted
Portable controller with integral power source for mechanical circulation support systems
AssigneeMinnetronix, Inc.
InventorsNathan J. Bolyard, Don W. E. Evans, Thomas P. Sutera
Life of this patent
Estimating the term…
Abstract
A portable external device for a mechanical circulation support system includes first and second power sources, e.g. batteries and control electronics for redundant uninterrupted operation of an implantable blood pump. The control and power source module may be configured to accommodate a variety of wearable configurations for patient convenience and comfort.
Claims20
A portable external device for a mechanical circulation support (MCS) system comprising:
- a power source configured to power an implantable pump;
- digital memory storing an algorithm for controlling an electric motor configured to drive the implantable pump;
- and
- control electronics configured to control the electric motor employing the algorithm,
- wherein the algorithm comprises instructions for causing the control electronics to:
- control the electric motor according to a field-oriented control (FOC) algorithm stored within the digital memory;
- while controlling the electric motor according to the FOC algorithm, estimate a back electromotive force (EMF) of the electric motor;
- determine a rotational position of a rotor of the electric motor based on the estimated back EMF of the electric motor;
- determine a pulse width modulated (PWM) voltage signal to send from the power source to the electric motor to drive the implantable pump based on the rotational position of the rotor of the electric motor;
- determine an error of the estimated back EMF;
- compare the error of the estimated back EMF to a threshold;
- and
- control the electric motor employing a trapezoidal control algorithm stored on the digital memory if the error of the estimated back EMF is greater than the threshold.
10 more elements
A mechanical circulation support (MCS) system comprising:
- an implantable pump;
- and
- a portable external device comprising:
- a power source configured to power an implantable pump;
- digital memory storing an algorithm for controlling an electric motor configured to drive the implantable pump;
- and
- control electronics configured to control the electric motor employing the algorithm,
- wherein the algorithm comprises instructions for causing the control electronics to:
- control the electric motor according to a field-oriented control (FOC) algorithm stored within the digital memory;
- while controlling the electric motor according to the FOC algorithm, estimate a back electromotive force (EMF) of the electric motor;
- determine a rotational position of a rotor of the electric motor based on the estimated back EMF of the electric motor;
- determine a pulse width modulated (PWM) voltage signal to send from the power source to the electric motor to drive the implantable pump based on the rotational position of the rotor of the electric motor;
- determine an error of the estimated back EMF;
- compare the error of the estimated back EMF to a threshold;
- and
- control the electric motor employing a trapezoidal control algorithm stored on the digital memory if the error of the estimated back EMF is greater than the threshold.
13 more elements
Dependencies are inferred from the claim text.