Patents by Inventor Alexander Medvedev
Alexander Medvedev has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20190060541Abstract: A ventricular assist device is disclosed. The ventricular assist device may include a centrifugal pump and a controller. The controller may be configured to cause the centrifugal pump to operate at a first speed above a predetermined flow rate. The controller may also be configured to cause the centrifugal pump to operate at a second speed below the predetermined flow rate, wherein the predetermined flowrate is indicative of a crossover point between systole and diastole phases of a person's cardiac cycle.Type: ApplicationFiled: October 29, 2018Publication date: February 28, 2019Inventors: Alexander Medvedev, Muhammad Sami
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Patent number: 10166318Abstract: A rotary machine is provided which may include a rotor and a stator within a housing. The stator may be for generating a rotating magnetic field for applying a torque to the rotor. A commutator circuit may provide a plurality of phase voltages to the stator, and a controller may adjust the plurality of phase voltages provided by the commutator circuit to modify an attractive force of the stator on the rotor to move the rotor in an axial direction.Type: GrantFiled: February 12, 2016Date of Patent: January 1, 2019Assignee: TC1 LLCInventors: Shunzhou Yu, Alexander Medvedev, Ren You
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Publication number: 20180333525Abstract: A method for synchronizing operation of a heart assist pump device to a patient's cardiac cycle includes obtaining a signal from a motor of a heart assist pump device and filtering the signal to remove noise. The method also includes determining a speed synchronization start point at which time the motor of the heart assist pump device will begin a change in speed of operation based on the filtered signal. The method further includes modulating a speed of the motor of the heart assist pump device to a target speed at the speed synchronization start point, thereby synchronizing the change in speed of operation with a patient's cardiac cycle.Type: ApplicationFiled: July 31, 2018Publication date: November 22, 2018Applicant: TC1 LLCInventors: Alexander Medvedev, Shunzhou Yu, Ren You
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Patent number: 10117983Abstract: A ventricular assist device is disclosed. The ventricular assist device may include a centrifugal pump and a controller. The controller may be configured to cause the centrifugal pump to operate at a first speed above a predetermined flow rate. The controller may also be configured to cause the centrifugal pump to operate at a second speed below the predetermined flow rate, wherein the predetermined flowrate is indicative of a crossover point between systole and diastole phases of a person's cardiac cycle.Type: GrantFiled: November 15, 2016Date of Patent: November 6, 2018Assignee: TC1 LLCInventors: Alexander Medvedev, Muhammad Sami
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Patent number: 10052420Abstract: A method for synchronizing operation of a heart assist pump device to a patient's cardiac cycle includes obtaining a signal from a motor of a heart assist pump device and filtering the signal to remove noise. The method also includes determining a speed synchronization start point at which time the motor of the heart assist pump device will begin a change in speed of operation based on the filtered signal. The method further includes modulating a speed of the motor of the heart assist pump device to a target speed at the speed synchronization start point, thereby synchronizing the change in speed of operation with a patient's cardiac cycle.Type: GrantFiled: February 11, 2016Date of Patent: August 21, 2018Assignee: TC1 LLCInventors: Alexander Medvedev, Shunzhou Yu, Ren You
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Publication number: 20180008759Abstract: A blood pump system is implantable in a patient for ventricular support. A pumping chamber has an inlet for receiving blood from a ventricle of the patient. An impeller is received in the pumping chamber. A motor is coupled to the impeller for driving rotation of the impeller. A motor controller is provided for tracking systolic and diastolic phases of a cardiac cycle of the patient and supplying a variable voltage signal to the motor in a variable speed mode to produce a variable impeller speed linked to the cardiac cycle. The impeller speed comprises a ramping up to an elevated speed during the diastolic phase in order to reduce a load on the ventricle at the beginning of the systolic phase.Type: ApplicationFiled: June 30, 2017Publication date: January 11, 2018Inventors: Alexander Medvedev, Masamichi Yanai
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Patent number: 9713663Abstract: A blood pump system is implantable in a patient for ventricular support. A pumping chamber has an inlet for receiving blood from a ventricle of the patient. An impeller is received in the pumping chamber. A motor is coupled to the impeller for driving rotation of the impeller. A motor controller is provided for tracking systolic and diastolic phases of a cardiac cycle of the patient and supplying a variable voltage signal to the motor in a variable speed mode to produce a variable impeller speed linked to the cardiac cycle. The impeller speed comprises a ramping up to an elevated speed during the diastolic phase in order to reduce a load on the ventricle at the beginning of the systolic phase.Type: GrantFiled: April 30, 2013Date of Patent: July 25, 2017Assignee: TC1 LLCInventors: Alexander Medvedev, Masamichi Yanai
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Publication number: 20170136163Abstract: A ventricular assist device is disclosed. The ventricular assist device may include a centrifugal pump and a controller. The controller may be configured to cause the centrifugal pump to operate at a first speed above a predetermined flow rate. The controller may also be configured to cause the centrifugal pump to operate at a second speed below the predetermined flow rate, wherein the predetermined flowrate is indicative of a crossover point between systole and diastole phases of a person's cardiac cycle.Type: ApplicationFiled: November 15, 2016Publication date: May 18, 2017Inventors: Alexander Medvedev, Muhammad Sami
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Patent number: 9623161Abstract: A system and method for detecting and mitigating a suction condition are disclosed. The method may include estimating a flow waveform of the pump, identifying pulses in the flow waveform, determining a negative flow based on a valid identification of a pulse, and evaluating a characteristic of the pulse for an existence of a suction condition. In various embodiments, a suction marker is located based on a minimum in a diastolic phase, and the suction marker location is used to identify a probability of a suction condition. A speed of the pump may be adjusted to mitigate the suction condition. A system and method for estimating flow is further disclosed. The method may include interpolating data sets defining pump power to flow for various pump speed values.Type: GrantFiled: August 25, 2015Date of Patent: April 18, 2017Assignee: TC1 LLCInventors: Alexander Medvedev, J. Bradford Rainier, Muhammad K. Sami
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Publication number: 20160235899Abstract: A rotary machine is provided which may include a rotor and a stator within a housing. The stator may be for generating a rotating magnetic field for applying a torque to the rotor. A commutator circuit may provide a plurality of phase voltages to the stator, and a controller may adjust the plurality of phase voltages provided by the commutator circuit to modify an attractive force of the stator on the rotor to move the rotor in an axial direction.Type: ApplicationFiled: February 12, 2016Publication date: August 18, 2016Inventors: Shunzhou Yu, Alexander Medvedev, Ren You
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Publication number: 20160228628Abstract: A method for synchronizing operation of a heart assist pump device to a patient's cardiac cycle includes obtaining a signal from a motor of a heart assist pump device and filtering the signal to remove noise. The method also includes determining a speed synchronization start point at which time the motor of the heart assist pump device will begin a change in speed of operation based on the filtered signal. The method further includes modulating a speed of the motor of the heart assist pump device to a target speed at the speed synchronization start point, thereby synchronizing the change in speed of operation with a patient's cardiac cycle.Type: ApplicationFiled: February 11, 2016Publication date: August 11, 2016Inventors: Alexander Medvedev, Shunzhou Yu, Ren You
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Publication number: 20160058930Abstract: A system and method for detecting and mitigating a suction condition are disclosed. The method may include characterizing pump waveform signal, identifying and evaluating a characteristic of the waveform for an existence of a suction condition. In various embodiments, a change in harmonic spectral distribution will identify a probability of a suction condition. A speed of the pump may be adjusted to mitigate the suction condition.Type: ApplicationFiled: August 25, 2015Publication date: March 3, 2016Inventors: Alexander Medvedev, J. Bradford Rainier, Muhammad K. Sami
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Publication number: 20160058929Abstract: A system and method for detecting and mitigating a suction condition are disclosed. The method may include estimating a flow waveform of the pump, identifying pulses in the flow waveform, determining a negative flow based on a valid identification of a pulse, and evaluating a characteristic of the pulse for an existence of a suction condition. In various embodiments, a suction marker is located based on a minimum in a diastolic phase, and the suction marker location is used to identify a probability of a suction condition. A speed of the pump may be adjusted to mitigate the suction condition. A system and method for estimating flow is further disclosed. The method may include interpolating data sets defining pump power to flow for various pump speed values.Type: ApplicationFiled: August 25, 2015Publication date: March 3, 2016Inventors: Alexander Medvedev, J. Bradford Rainier, Muhammad K. Sami
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Patent number: 9056159Abstract: A circulatory assist system has a pump with a motor coupled to rotate the pump at a selectable speed. A controller drives the motor at a target speed and collects blood flow measurements during operation of the pump. An impaired flow condition is identified when a plurality of successive blood flow measurements are between an expected minimum flow and a low flow threshold, such that the low flow would necessitate issuing an alert. During the impaired flow condition, it is detected whether an inflow obstruction exists by determining whether a reduction in speed of the pump is correlated with a predetermined increase in the blood flow measurements. If the inflow obstruction is detected, then the speed of the pump is further reduced to further increase the blood flow measurements.Type: GrantFiled: June 13, 2013Date of Patent: June 16, 2015Assignee: Thoratec CorporationInventors: Alexander Medvedev, Muhammad K. Sami, Masamichi Yanai
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Publication number: 20140323796Abstract: A blood pump system is implantable in a patient for ventricular support. A pumping chamber has an inlet for receiving blood from a ventricle of the patient. An impeller is received in the pumping chamber. A motor is coupled to the impeller for driving rotation of the impeller. A motor controller is provided for tracking systolic and diastolic phases of a cardiac cycle of the patient and supplying a variable voltage signal to the motor in a variable speed mode to produce a variable impeller speed linked to the cardiac cycle. The impeller speed comprises a ramping up to an elevated speed during the diastolic phase in order to reduce a load on the ventricle at the beginning of the systolic phase.Type: ApplicationFiled: April 30, 2013Publication date: October 30, 2014Applicant: THORATEC CORPORATIONInventors: Alexander Medvedev, Masamichi Yanai
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Publication number: 20140066689Abstract: An integrated control module is provided for a ventricular assist device. A housing receives a power monitoring/switching circuit, a main receptacle, and a quasi-internal backup receptacle. The main receptacle within the housing receives a main battery. The main receptacle is configured for manual installation and removal of the main battery without requiring any separate tool. The quasi-internal backup receptacle within the housing receives a backup battery having a battery capacity less than the main battery. The backup receptacle includes a locking mechanism that requires use of a separate tool to unlock the locking mechanism for removing the backup battery. The backup battery is installed and removed without disturbing power supplied from a main battery in the main receptacle to the power monitoring/switching circuit.Type: ApplicationFiled: September 4, 2012Publication date: March 6, 2014Inventors: J. Bradford Rainier, Alexander Medvedev
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Patent number: 8613696Abstract: A circulatory assist system has a pump with a motor coupled to rotate the pump at a selectable speed. A controller drives the motor at a target speed and collects blood flow measurements during operation of the pump. An impaired flow condition is identified when a plurality of successive blood flow measurements are between an expected minimum flow and a low flow threshold, such that the low flow would necessitate issuing an alert. During the impaired flow condition, it is detected whether an inflow obstruction exists by determining whether a reduction in speed of the pump is correlated with a predetermined increase in the blood flow measurements. If the inflow obstruction is detected, then the speed of the pump is further reduced to further increase the blood flow measurements.Type: GrantFiled: August 15, 2011Date of Patent: December 24, 2013Assignee: Thoratec CorporationInventors: Alexander Medvedev, Muhammad K. Sami, Masamichi Yanai
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Publication number: 20130289337Abstract: A circulatory assist system has a pump with a motor coupled to rotate the pump at a selectable speed. A controller drives the motor at a target speed and collects blood flow measurements during operation of the pump. An impaired flow condition is identified when a plurality of successive blood flow measurements are between an expected minimum flow and a low flow threshold, such that the low flow would necessitate issuing an alert. During the impaired flow condition, it is detected whether an inflow obstruction exists by determining whether a reduction in speed of the pump is correlated with a predetermined increase in the blood flow measurements. If the inflow obstruction is detected, then the speed of the pump is further reduced to further increase the blood flow measurements.Type: ApplicationFiled: June 13, 2013Publication date: October 31, 2013Inventors: Alexander Medvedev, Muhammad K. Sami, Masamichi Yanai
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Publication number: 20130179618Abstract: Provided are techniques for physically coupling, via a docking port, a first stand-alone computing device to a communication bus coupled to a set of processing resources; detecting, by the communication bus, the coupling; responsive to the detecting of the coupling, correlating the stand-alone computing device to a subset of the set of processing resources; signaling, by the communication bus, each resource of the subset of the coupling; and responsive to the signaling, dynamically configuring the stand-alone computing device and each resource of the subset to enable the stand-alone computing device to utilize each resource of the subset.Type: ApplicationFiled: January 5, 2012Publication date: July 11, 2013Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Juan M. Casas, JR., Nikhil Hegde, Alexander Medvedev, Rashmi Narasimhan
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Patent number: 8475725Abstract: A method and energy-efficient apparatus for the treatment of liquids through the joint use of a gas mixture-oxidizing agent and UV radiation. This method uses an excimer UV lamp performing two actions affecting the liquid and changing its properties with UV radiation and the generation of a gas mixture containing strong oxidizing agents for influence on the liquid, disinfection and purification of the liquid being treated from contaminants. The apparatus incorporates energy efficient design features to reduce energy consumption and operational costs, as well as an excimer lamp design that improves performance parameters to surpass and outlast existing devices. Unique electrode designs, cleaning systems, and materials combine to create a state-of-the-art liquid treatment apparatus that exceeds existing industrial analogs and norms.Type: GrantFiled: August 21, 2012Date of Patent: July 2, 2013Assignee: East Coast Distribution, Inc.Inventors: Alexander Antipenko, Dmitry Budovich, Richard H. Sakaji, Alexander Medvedev, Eugene Veklerov, Vladimir Rakhamimov