Patents by Inventor Refet Firat Yazicioglu

Refet Firat Yazicioglu 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).

  • Publication number: 20200306534
    Abstract: A system for stimulation of a nerve and measuring impedance. The system includes a neural interface device including a plurality of electrodes; a voltage or current source operatively connected to at least a subset of the electrodes, wherein the voltage or current source is configured to generate an electrical signal to be applied to the electrodes; an impedance measuring module operatively connected to at least a subset of the electrodes, wherein the impedance measurement module is configured to measure the impedance between the electrodes; and a controller arranged to determine an amplitude of an action potential induced in the nerve, via the electrical signal, based on the measured impedance and to adjust the electrical signal in order to induce an action potential having a target amplitude.
    Type: Application
    Filed: December 20, 2018
    Publication date: October 1, 2020
    Inventors: Refet Firat YAZICIOGLU, Rizwan BASHIRULLAH, Gerald Edwin HUNSBERGER, Jr.
  • Patent number: 10624547
    Abstract: Devices and systems described herein relate to a sensing device that includes an output area and an electrode area. The output area includes an output circuit comprising an integrator adapted to integrate a received current so as to generate an output voltage corresponding to the received current. The electrode area includes an electrode comprising an exposed, electrically conductive, surface area and electrode circuitry connected to the exposed surface area. The electrode circuitry comprises a voltage-to-current transducer adapted to produce a wire current corresponding to a voltage present at the exposed surface area. The sensing device also includes a connecting wire electrically connecting the electrode circuitry to the output circuit, wherein the current received by the output circuit is the wire current.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: April 21, 2020
    Assignees: IMEC VZW, Katholieke Univesiteit Leuven, KU LEUVEN R&D
    Inventors: Bogdan Raducanu, Srinjoy Mitra, Refet Firat Yazicioglu
  • Publication number: 20190388696
    Abstract: A device that is implantable in body tissue of a human or animal. The device is comprised of a header comprising at least one terminal adapted for removable connection to a lead and an open ended case closed by a plate to form a housing. The housing is comprised of a surrounding edge wall joined to a first side wall and a second side wall opposed to the first side wall. At least a first suture port extends through the edge wall and the second side wall but not the first side wall at an upper edge region of the housing. A second suture port may extend through the surrounding edge wall and the second side wall but not the first side wall in a similar manner. A third suture port may extend through the header. The three suture ports may define a triangular attachment configuration.
    Type: Application
    Filed: June 20, 2019
    Publication date: December 26, 2019
    Inventors: Ignacio A. Armesto, Luis Daniel Villamil, Refet Firat Yazicioglu, Kristina Schlegel, Kent Leyde
  • Patent number: 9681844
    Abstract: A biopotential signal acquisition system, comprising: a first active electrode including an integrated pre-amplifier and an analogue to digital converter; a second active electrode including an integrated pre-amplifier and an analogue to digital converter, wherein the second active electrode has variable gain; a test signal generator for generating a test signal at a test frequency and coupling the test signal to the first and/or second active electrodes; and a digital signal processor configured to: process the digital outputs of the first and second active electrodes to derive a gain control signal based on a difference between the first and second active electrode outputs at the test frequency, and apply the gain control signal to the second active electrode. The disclosure also relates to an electronic circuit or device and a biopotential signal acquisition method.
    Type: Grant
    Filed: June 26, 2014
    Date of Patent: June 20, 2017
    Assignees: IMEC VZW, Stichting IMEC Nederland
    Inventors: Jiawei Xu, Refet Firat Yazicioglu
  • Publication number: 20170000368
    Abstract: Devices and systems described herein relate to a sensing device that includes an output area and an electrode area. The output area includes an output circuit comprising an integrator adapted to integrate a received current so as to generate an output voltage corresponding to the received current. The electrode area includes an electrode comprising an exposed, electrically conductive, surface area and electrode circuitry connected to the exposed surface area. The electrode circuitry comprises a voltage-to-current transducer adapted to produce a wire current corresponding to a voltage present at the exposed surface area. The sensing device also includes a connecting wire electrically connecting the electrode circuitry to the output circuit, wherein the current received by the output circuit is the wire current.
    Type: Application
    Filed: June 30, 2016
    Publication date: January 5, 2017
    Applicants: IMEC VZW, Katholieke Universiteit Leuven, KU LEUVEN R&D
    Inventors: Bogdan Raducanu, Srinjoy Mitra, Refet Firat Yazicioglu
  • Patent number: 9391456
    Abstract: A current generator is disclosed. An example current generator includes a plurality of current cells connected in parallel, each current cell being connected to a switch. The current generator further includes a first summer configured to sum the output of each current cell of a first subset of the plurality of current cells and a second summer configured to sum the output of each current cell of a second subset of the plurality of current cells. The current generator also includes a combiner configured to combine the outputs of the first and second summers. Further, each switch is switchable according to a sequence to generate a summed output of the current cells at a plurality of quantization levels to generate positive and/or negative alternations of a pseudo-sinusoidal, alternating current.
    Type: Grant
    Filed: December 16, 2013
    Date of Patent: July 12, 2016
    Assignee: IMEC
    Inventors: Sunyoung Kim, Refet Firat Yazicioglu
  • Patent number: 9375182
    Abstract: A biopotential signal acquisition system including an analog readout unit configured to receive an analog biopotential signal, which may be acquired from at least one electrode attached to a body; and to extract an analog measured biopotential signal and an analog reference signal. The system also includes an ADC unit configured to provide a digital version of the analog measured biopotential signal and the analog reference signal, a digital filter unit configured to calculate a digital motion artifact estimate based on the digital version of the measured biopotential signal and the reference signal. The system further comprises a reference signal processing unit configured to convert the reference signal into a new reference signal being provided to the digital filter unit based on the correlation between the measured biopotential signal and the reference signal.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: June 28, 2016
    Assignee: IMEC VZW
    Inventors: Hyejung Kim, Nick Van Helleputte, Refet Firat Yazicioglu
  • Patent number: 9326733
    Abstract: A biopotential signal acquisition system comprising an analog readout unit configured to receive an analog biopotential signal and to extract an analog measured biopotential signal and an analog reference signal, and an ADC unit configured to provide a digital version of the analog measured biopotential signal and the analog reference signal. The system also includes a first digital filter unit comprising a cascaded integrator-comb filter configured to provide a first digital filtered version of the digital measured biopotential signal and the reference signal, and a second digital filter unit configured to calculate a digital motion artifact estimate based on the first digital filtered version signals.
    Type: Grant
    Filed: February 5, 2015
    Date of Patent: May 3, 2016
    Assignee: IMEC VZW
    Inventors: Hyejung Kim, Nick Van Helleputte, Refet Firat Yazicioglu
  • Patent number: 9294048
    Abstract: An instrumentation amplifier includes a first amplifier having one input connected to a first input of the instrumentation amplifier, a second amplifier having one input connected to a second input of the instrumentation amplifier, and a feedback network. The feedback network including an active filter having a first low pass filter characteristic with a first cut-off frequency in respect of differential mode signals at the first and second inputs of the instrumentation amplifier, and a second low pass filter characteristic with a second cut-off frequency in respect of common mode signals at the first and second inputs of the instrumentation amplifier. The disclosure also relates to a device for acquiring biopotential signals and a signal amplification method.
    Type: Grant
    Filed: June 26, 2014
    Date of Patent: March 22, 2016
    Assignee: IMEC VZW
    Inventors: Nick Van Helleputte, Refet Firat Yazicioglu
  • Publication number: 20150342490
    Abstract: A biological signal detecting apparatus includes a BPF to which a biological signal is input via a lead directly connected to a subcutaneous tissue that emits the biological signal including a predetermined signal of a first frequency and which outputs a filtered biological signal by filtering a biological event signal of a predetermined frequency including the first frequency; and a peak detecting means to which at least the filtered biological signal is input and which detects a peak location of the biological event signal. The BPF includes a first order HPF which filters a frequency higher than a second frequency and a first order LPF which filters a frequency lower than a third frequency. The HPF and the LPF are connected in series between the lead and the peak detecting means. A difference between the second frequency and the third frequency is less than or equal to 10 Hz.
    Type: Application
    Filed: August 12, 2015
    Publication date: December 3, 2015
    Applicant: OLYMPUS CORPORATION
    Inventors: Shrestha Sachin, Refet Firat Yazicioglu, Torfs Tom, Masato Osawa
  • Publication number: 20150216481
    Abstract: A biopotential signal acquisition system comprising an analogue readout unit configured to receive an analogue biopotential signal and to extract an analogue measured biopotential signal and an analogue reference signal, and an ADC unit configured to provide a digital version of the analogue measured biopotential signal and the analogue reference signal. The system also includes a first digital filter unit comprising a cascaded integrator-comb filter configured to provide a first digital filtered version of the digital measured biopotential signal and the reference signal, and a second digital filter unit configured to calculate a digital motion artifact estimate based on the first digital filtered version signals.
    Type: Application
    Filed: February 5, 2015
    Publication date: August 6, 2015
    Applicant: IMEC VZW
    Inventors: Hyejung Kim, Nick Van Helleputte, Refet Firat Yazicioglu
  • Publication number: 20150173683
    Abstract: A biopotential signal acquisition system including an analogue readout unit configured to receive an analogue biopotential signal, which may be acquired from at least one electrode attached to a body; and to extract an analogue measured biopotential signal and an analogue reference signal. The system also includes an ADC unit configured to provide a digital version of the analogue measured biopotential signal and the analogue reference signal, a digital filter unit configured to calculate a digital motion artifact estimate based on the digital version of the measured biopotential signal and the reference signal. The system further comprises a reference signal processing unit configured to convert the reference signal into a new reference signal being provided to the digital filter unit based on the correlation between the measured biopotential signal and the reference signal.
    Type: Application
    Filed: December 17, 2014
    Publication date: June 25, 2015
    Applicant: IMEC VZW
    Inventors: Hyejung Kim, Nick Van Helleputte, Refet Firat Yazicioglu
  • Publication number: 20150119747
    Abstract: A system for the acquisition of biopotential signals, comprising at least a first electrode configured for detecting a biopotential signal within a signal bandwidth of interest and being connected to an impedance detection module that provides a first electrode voltage. The impedance detection module comprises a current generation circuit connected in parallel to an amplifier. The current generation circuit comprises an AC current generator configured to generate a first current signal through the first electrode. The first current signal has a frequency outside of the signal bandwidth of interest. The current generation circuit also comprising a capacitor connected between the input of the amplifier and the AC current generator so as to isolate the AC current generator from the amplifier input at the signal bandwidth of interest.
    Type: Application
    Filed: October 30, 2014
    Publication date: April 30, 2015
    Applicant: IMEC VZW
    Inventors: Tom Torfs, Refet Firat Yazicioglu
  • Patent number: 8937509
    Abstract: A multi-channel biopotential signal acquisition system is disclosed. In the system, a plurality of biopotential channels is corrected for common-mode interference. In one aspect, each biopotential channel includes an electrode for providing a biopotential input signal and an associated amplifier for amplifying the biopotential input signal and providing a biopotential output signal. The output signal is processed in a processor. Each biopotential output signal is passed to a common-mode feedback system, which determines an average common-mode signal and feeds that signal back to each of the amplifiers in each of the biopotential channels to enhance common-mode rejection ratio of the system.
    Type: Grant
    Filed: September 7, 2011
    Date of Patent: January 20, 2015
    Assignees: IMEC, Stichting IMEC Nederland
    Inventors: Jiawei Xu, Refet Firat Yazicioglu
  • Publication number: 20150002221
    Abstract: An instrumentation amplifier includes a first amplifier having one input connected to a first input of the instrumentation amplifier, a second amplifier having one input connected to a second input of the instrumentation amplifier, and a feedback network. The feedback network including an active filter having a first low pass filter characteristic with a first cut-off frequency in respect of differential mode signals at the first and second inputs of the instrumentation amplifier, and a second low pass filter characteristic with a second cut-off frequency in respect of common mode signals at the first and second inputs of the instrumentation amplifier. The disclosure also relates to a device for acquiring biopotential signals and a signal amplification method.
    Type: Application
    Filed: June 26, 2014
    Publication date: January 1, 2015
    Applicant: IMEC VZW
    Inventors: Nick Van Helleputte, Refet Firat Yazicioglu
  • Publication number: 20150005585
    Abstract: A biopotential signal acquisition system, comprising: a first active electrode including an integrated pre-amplifier and an analogue to digital converter; a second active electrode including an integrated pre-amplifier and an analogue to digital converter, wherein the second active electrode has variable gain; a test signal generator for generating a test signal at a test frequency and coupling the test signal to the first and/or second active electrodes; and a digital signal processor configured to: process the digital outputs of the first and second active electrodes to derive a gain control signal based on a difference between the first and second active electrode outputs at the test frequency, and apply the gain control signal to the second active electrode. The disclosure also relates to an electronic circuit or device and a biopotential signal acquisition method.
    Type: Application
    Filed: June 26, 2014
    Publication date: January 1, 2015
    Applicants: IMEC VZW, Stichting IMEC Nederland
    Inventors: Jiawei Xu, Refet Firat Yazicioglu
  • Patent number: 8914099
    Abstract: A system for the analysis of ECG signals is disclosed. The system may comprise (i) at least one readout channel, configured to receive an analog ECG signal acquired from at least one electrode attached to a body, and to extract an analog measured ECG signal and analog electrode-skin impedance signals; (ii) at least one ADC, configured to convert those extracted analog signals at the readout channel into digital signals; (iii) a digital adaptive filter unit, configured to calculate a digital motion artifact estimate based on said digital versions of the measured ECG signal and the electrode-skin impedance signals; (iv) at least one DAC, configured to convert said digital motion artifact estimate into an analog signal; and (v) a feedback loop for sending said analog motion artifact estimate signal back to the readout channel configured to deduct said analog motion artifact estimate signal from said analog measured ECG signal.
    Type: Grant
    Filed: November 7, 2012
    Date of Patent: December 16, 2014
    Assignee: IMEC
    Inventors: Refet Firat Yazicioglu, Sunyoung Kim
  • Patent number: 8886299
    Abstract: A microprocessor configured to receive and process digitized signals derived from an analogue ECG signal is provided. An example microprocessor comprises a beat detection unit configured to receive the in-phase and quadrature phase band power signals, calculate a band power value and an adaptive threshold value, and compare said band power value with said adaptive threshold value to detect a QRS complex of the ECG signal indicative of a detected valid beat; and an R peak detection unit configured to receive the digital ECG signal and information about the detected valid beat, select a portion of the received ECG signal as a first time window around the detected valid beat; determine the location of a first R peak position; and perform a time domain search in a second time window around said first R peak position in order to refine the location of an R peak position.
    Type: Grant
    Filed: November 1, 2012
    Date of Patent: November 11, 2014
    Assignee: IMEC
    Inventors: Refet Firat Yazicioglu, Tom Torfs, Sachin Shrestha
  • Patent number: 8862210
    Abstract: An analog signal processor (ASP) application-specific integrated circuit (ASIC) is disclosed. The ACIS can be used for remotely monitoring ECG signals of a subject that has reduced power consumption. In one aspect, the ASIC performs the functions of: ECG signal extraction with high resolution using ECG readout channel, feature extraction using a band-power extraction channel, adaptive sampling the ECG signals using an adaptive sampling analog-to-digital converter, and impedance monitoring for signal integrity using an impedance monitoring channel. These functions enable the development of wireless ECG monitoring systems that have significantly lower power consumption but are more efficient that predecessor systems. In one embodiment, the ASP ASIC consumes 30 ?W from a 2V supply with compression provided by adaptive sampling providing large reductions in power consumption of a wireless ECG monitoring system of which the ASP ASIC forms a part.
    Type: Grant
    Filed: September 14, 2010
    Date of Patent: October 14, 2014
    Assignees: IMEC, Stichting IMEC Nederland
    Inventors: Refet Firat Yazicioglu, Julien Penders, Sunyoung Kim
  • Publication number: 20140175891
    Abstract: A current generator is disclosed. An example current generator includes a plurality of current cells connected in parallel, each current cell being connected to a switch. The current generator further includes a first summer configured to sum the output of each current cell of a first subset of the plurality of current cells and a second summer configured to sum the output of each current cell of a second subset of the plurality of current cells. The current generator also includes a combiner configured to combine the outputs of the first and second summers. Further, each switch is switchable according to a sequence to generate a summed output of the current cells at a plurality of quantization levels to generate positive and/or negative alternations of a pseudo-sinusoidal, alternating current.
    Type: Application
    Filed: December 16, 2013
    Publication date: June 26, 2014
    Applicant: IMEC
    Inventors: Sunyoung Kim, Refet Firat Yazicioglu