The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 12, 2010
Filed:
Mar. 19, 2001
Alexander Medvedev, Orange Village, OH (US);
Leonard A. R. Golding, Auburn Road, OH (US);
Alexander Massiello, Chesterland, OH (US);
Alexander Medvedev, Orange Village, OH (US);
Leonard A. R. Golding, Auburn Road, OH (US);
Alexander Massiello, Chesterland, OH (US);
Other;
Abstract
In a left ventricular assist device (LVAD) a rotodynamic blood pump () is powered by a brushless DC motor (). A power supply () supplies power to the motor (). Three feedback channels, one for each of voltage, current, and motor speed lead to a microcontroller or microprocessor (). The three feedback waveforms are analyzed, and from these waveforms, motor input power, patient heart rate, current pump flow rate, and systemic pressure are determined. The microprocessor () then calculates a desired flow rate proportional to the patient heart rate. The microprocessor communicates a new power output to a commutation circuit (), which regulates power to the motor (). The pump () also includes safety checks that are prioritized over desired pump flow. These include prevention of ventricular suction, low pulsatility, minimum and maximum pump speed, minimum speed-relative pump flow, minimum absolute pump flow, minimum and maximum motor input power.