Patents by Inventor Sardar Ansari
Sardar Ansari 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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Patent number: 11779235Abstract: Devices and techniques for continuously monitoring pressure and simultaneously monitoring changes in blood flow, vascular resistance, and/or vascular behavior are provided. The techniques are employed in measuring intracranial pressure (ICP), while simultaneously measuring cerebral blood flow and/or cerebrovascular resistance or behavior. A sensor device includes an optical and piezoelectric sensing assembly integrated into a deployable ICP monitoring device.Type: GrantFiled: February 18, 2020Date of Patent: October 10, 2023Assignee: REGENTS OF THE UNIVERSITY OF MICHIGANInventors: Kevin R. Ward, Kenn Oldham, Lu Wang, Sardar Ansari
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Publication number: 20230157563Abstract: Methods and systems monitor and assess brain bioimpedance through the use of an ocular window that assesses dynamic changes in cerebral blood volume (CBV). That ocular window is implemented through an ocular bioimpedance device that, in a non-invasive manner, measures numerous different brain health indicators using the hioimpedance measurements collected through the regions around the eyes. The ocular bioimpedance device may be goggles with localized measurement electrodes that include cathodes and anodes.Type: ApplicationFiled: October 31, 2022Publication date: May 25, 2023Inventors: Kevin Ward, Mohamad Hakam Tiba, Ashwin Belle, Sardar Ansari, Parag G. Patil
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Patent number: 11484217Abstract: Methods and systems monitor and assess brain bioimpedance through the use of an ocular window that assesses dynamic changes in cerebral blood volume (CBV). That ocular window is implemented through an ocular bioimpedance device that, in a non-invasive manner, measures numerous different brain health indicators using the bioimpedance measurements collected through the regions around the eyes. The ocular bioimpedance device may be goggles with localized measurement electrodes that include cathodes and anodes.Type: GrantFiled: May 16, 2018Date of Patent: November 1, 2022Assignee: THE REGENTS OF THE UNIVERSITY OF MICHIGANInventors: Kevin Ward, Mohamad Hakam Tiba, Ashwin Belle, Sardar Ansari, Parag G. Patil
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Publication number: 20220133159Abstract: A method for noninvasively measuring hemodynamic variables of a person includes physically configuring a sensor to measure the pulse of a person. The sensor generates a pulse waveform indicative of the pulse of the person. A processor obtains the pulse waveform from the sensor and the processor determines a reflection coefficient and reflection delay between an incident and a reflected wave, from which the processor determines the hemodynamic variables of the person from the reflection coefficient and the reflection delay.Type: ApplicationFiled: October 29, 2021Publication date: May 5, 2022Inventors: Sardar Ansari, Kenn Oldham, Kevin R. Ward, Kayvan Najarian, Lu Wang
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Patent number: 11172839Abstract: A wearable assembly has a pulse plethysmography (PPG) sensor and a piezoelectric pressure sensor and is attachable to a patient's finger or other area corresponding to a peripheral vascular region, and further includes a signal processor configured to monitor blood flow dependent measurements and pressure measurements over time, comparing these measurements to determine properties of the vascular region, such as vascular resistance of a blood vessel, vascular radius of the blood vessel, vascular stiffness of the vascular region, blood pressure, and/or cardiac vascular power. The signal processor may apply a hysteresis comparison of the sensor outputs, e.g., using an elliptical model, and in some examples may apply an extended Kalman filter for optimizing output of the vascular region properties.Type: GrantFiled: October 25, 2017Date of Patent: November 16, 2021Assignee: THE REGENTS OF THE UNIVERSITY OF MICHIGANInventors: Kevin R. Ward, Sardar Ansari, Lu Wang, Kayvan Najarian, Kenn Oldham
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Publication number: 20210304855Abstract: A method includes receiving raw input signals, analyzing the raw signals using a trained coding architecture including an encoding layer; and displaying an output. A computing system includes a processor and a memory storing instructions that when executed by the processor, cause the computing system to receive raw input signals, analyzing the raw signals using a trained coding architecture and display an output. A non-transitory computer readable medium includes program instructions that when executed cause a computer to receive raw input signals, analyze the raw signals using a trained coding architecture and display an output.Type: ApplicationFiled: March 25, 2021Publication date: September 30, 2021Inventors: Sardar Ansari, Christopher Elliot Gillies, Kevin R. Ward, Hamid Ghanbari
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Publication number: 20210169362Abstract: Methods and systems monitor and assess brain bioimpedance through the use of an ocular window that assesses dynamic changes in cerebral blood volume (CBV). That ocular window is implemented through an ocular bioimpedance device that, in a non-invasive manner, measures numerous different brain health indicators using the bioimpedance measurements collected through the regions around the eyes. The ocular bioimpedance device may be goggles with localized measurement electrodes that include cathodes and anodes.Type: ApplicationFiled: May 16, 2018Publication date: June 10, 2021Inventors: Kevin Ward, Mohamad Hakam Tiba, Ashwin Belle, Sardar Ansari, Parag G. Patil
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Publication number: 20200260975Abstract: Devices and techniques for continuously monitoring pressure and simultaneously monitoring changes in blood flow, vascular resistance, and/or vascular behavior are provided. The techniques are employed in measuring intracranial pressure (ICP), while simultaneously measuring cerebral blood flow and/or cerebrovascular resistance or behavior. A sensor device includes an optical and piezoelectric sensing assembly integrated into a deployable ICP monitoring device.Type: ApplicationFiled: February 18, 2020Publication date: August 20, 2020Inventors: Kevin R. Ward, Kenn Oldham, Lu Wang, Sardar Ansari
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Patent number: 10610113Abstract: The invention is a passive, wearable sensor that uses a thin piezoelectric material to produce a time history of blood pressure of the patient, with signal processing algorithms to extract physiological information. The sensor consists of a piezoelectric transducer set in a polymer laminate that can be applied to the finger or wrist of the patient. During use, a combination of compressive and bending deformation in the piezoelectric layer in response to blood pressure in the finger or wrist as a voltage output. Using signal processing techniques, the raw signal is filtered and decomposed to obtain a information to form derivative signals such as blood pressure, pulse pressure, pulse pressure variability, heart rate, heart rate variability, and respiratory rate which can be very important pre-cursors in the monitoring of the patient's physiological conditions.Type: GrantFiled: March 31, 2015Date of Patent: April 7, 2020Assignee: THE REGENTS OF THE UNIVERSITY OF MICHIGANInventors: Kayvan Najarian, Kenn Oldham, Daniel Slavin, Ashwin Belle, Kevin R. Ward, Sardar Ansari, Rodney C. Daniels
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Publication number: 20200054221Abstract: A wearable assembly has a pulse plethysmography (PPG) sensor and a piezoelectric pressure sensor and is attachable to a patient's finger or other area corresponding to a peripheralvascular region, and further includes a signal processor configured to monitor blood flow dependent measurements and pressure measurements over time, comparing these measurements to determine properties of the vascular region, such as vascular resistance of a blood vessel, vascular radius of the blood vessel, vascular stiffness of the vascular region, blood pressure, and/or cardiac vascular power. The signal processor may apply a hysteresis comparison of the sensor outputs, e.g., using an elliptical model, and in some examples may apply an extended Kalman filter for optimizing output of the vascular region properties.Type: ApplicationFiled: October 25, 2017Publication date: February 20, 2020Inventors: Kevin R. Ward, Sardar Ansari, Lu Wang, Kayvan Najarian, Kenn Oldham
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Patent number: 10349896Abstract: The present application describes techniques to filter signals contaminated with blunt noise. Calculated filter coefficients may be applied to signals to generate filtered output signals without the blunt noise. Sets of filter coefficients may be calculated utilizing an ?-tube filter process in conjunction with an autoregressive exogenous (ARX) model. Sets of filter coefficients may be calculated in accordance with a constrained optimization algorithm using data indicative of a source of the blunt noise. When the blunt noise is modeled in accordance with the ARX model, filtered output signals are generated having amplitudes constrained to a selected Epsilon value, which may be the amplitude of a primary component of the unfiltered signal. A set of filter coefficients may be calculated by determining, from the set of filter coefficients that satisfy the constrained optimization algorithm, a solution that produces a filtered output signal having the most time-invariant frequency composition.Type: GrantFiled: December 8, 2014Date of Patent: July 16, 2019Assignee: THE REGENTS OF THE UNIVERSTIY OF MICHIGANInventors: Sardar Ansari, Kevin Ward, Kayvan Najarian
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Patent number: 10034638Abstract: Techniques for motion artifact (MA) reduction in impedance plethysmography (IP) and other physiological signals are provided. The techniques limit the amplitude of MA filtered signals by imposing an “?-tube.” The techniques may include the introduction of a regularization term to ensure that the pattern of a filtered signal is similar to the pattern of the primary component of the original, unfiltered signal by maximizing the regularity of the filtered signal. The techniques may be integrated into a portable monitoring device, such as an armband, to remove MA from various diagnostic signals and to extract primary signal components for producing enhanced device performance.Type: GrantFiled: February 22, 2016Date of Patent: July 31, 2018Assignee: THE REGENTS OF THE UNIVERSITY OF MICHIGANInventors: Sardar Ansari, Kayvan Najarian, Kevin Ward
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Publication number: 20160287180Abstract: Techniques for motion artifact (MA) reduction in impedance plethysmography (IP) and other physiological signals are provided. The techniques limit the amplitude of MA filtered signals by imposing an “?-tube.” The techniques may include the introduction of a regularization term to ensure that the pattern of a filtered signal is similar to the pattern of the primary component of the original, unfiltered signal by maximizing the regularity of the filtered signal. The techniques may be integrated into a portable monitoring device, such as an armband, to remove MA from various diagnostic signals and to extract primary signal components for producing enhanced device performance.Type: ApplicationFiled: February 22, 2016Publication date: October 6, 2016Inventors: Sardar Ansari, Kayvan Najarian, Kevin Ward
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Publication number: 20160249862Abstract: The present application describes techniques to filter signals contaminated with blunt noise. Calculated filter coefficients may be applied to signals to generate filtered output signals without the blunt noise. Sets of filter coefficients may be calculated utilizing an ?-tube filter process in conjunction with an autoregressive exogenous (ARX) model. Sets of filter coefficients may be calculated in accordance with a constrained optimization algorithm using data indicative of a source of the blunt noise. When the blunt noise is modeled in accordance with the ARX model, filtered output signals are generated having amplitudes constrained to a selected Epsilon value, which may be the amplitude of a primary component of the unfiltered signal. A set of filter coefficients may be calculated by determining, from the set of filter coefficients that satisfy the constrained optimization algorithm, a solution that produces a filtered output signal having the most time-invariant frequency composition.Type: ApplicationFiled: December 8, 2014Publication date: September 1, 2016Inventors: Sardar Ansari, Kevin Ward, Kayvan Najarian
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Publication number: 20150305632Abstract: The invention is a passive, wearable sensor that uses a thin piezoelectric material to produce a time history of blood pressure of the patient, with signal processing algorithms to extract physiological information. The sensor consists of a piezoelectric transducer set in a polymer laminate that can be applied to the finger or wrist of the patient. During use, a combination of compressive and bending deformation in the piezoelectric layer in response to blood pressure in the finger or wrist as a voltage output. Using signal processing techniques, the raw signal is filtered and decomposed to obtain a information to form derivative signals such as blood pressure, pulse pressure, pulse pressure variability, heart rate, heart rate variability, and respiratory rate which can be very important pre-cursors in the monitoring of the patient's physiological conditions.Type: ApplicationFiled: March 31, 2015Publication date: October 29, 2015Inventors: Kayvan Najarian, Kenn Oldham, Daniel Slavin, Ashwin Belle, Kevin R. Ward, Sardar Ansari, Rodney C. Daniels