Patents by Inventor Yong K. Cho

Yong K. Cho 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: 20200359959
    Abstract: Sensing circuitry of an implantable medical device (IMD) system may sense a cardiac signal that varies according to a cardiac cycle of a patient. Processing circuitry of the IMD system may determine a series of consecutive cardiac cycle length metric values based on the sensed cardiac signal, identify a plurality of pairs of the cardiac cycle length metrics, each of the pairs of cardiac cycle length metrics separated by an integer ā€˜nā€™ of the cardiac cycle length metrics, and construct a distribution of the pairs of cardiac cycle length metrics based on values of the cardiac cycle length metrics for each of the pairs. The processing circuitry may detect a sleep apnea episode of the patient based on one or more characteristics of the constructed distribution, and control communication circuitry of the IMD system to transmit an indication of the detected sleep apnea episode to the external computing device.
    Type: Application
    Filed: August 4, 2020
    Publication date: November 19, 2020
    Inventors: Yong K. Cho, Shantanu Sarkar, Eduardo N. Warman
  • Patent number: 10765359
    Abstract: Sensing circuitry of an implantable medical device (IMD) system may sense a cardiac signal that varies according to a cardiac cycle of a patient. Processing circuitry of the IMD system may determine a series of consecutive cardiac cycle length metric values based on the sensed cardiac signal, identify a plurality of pairs of the cardiac cycle length metrics, each of the pairs of cardiac cycle length metrics separated by an integer ā€˜nā€™ of the cardiac cycle length metrics, and construct a distribution of the pairs of cardiac cycle length metrics based on values of the cardiac cycle length metrics for each of the pairs. The processing circuitry may detect a sleep apnea episode of the patient based on one or more characteristics of the constructed distribution, and control communication circuitry of the IMD system to transmit an indication of the detected sleep apnea episode to the external computing device.
    Type: Grant
    Filed: December 16, 2016
    Date of Patent: September 8, 2020
    Assignee: Medtronic, Inc.
    Inventors: Yong K. Cho, Shantanu Sarkar, Eduardo N. Warman
  • Patent number: 10758733
    Abstract: An implantable medical device has a housing having a proximal end, a distal end and an outer sidewall extending from the proximal end to the distal end. A fixation sheath includes a housing sheath portion extending along the outer sidewall of the housing, and a fixation member portion extending from the housing sheath portion. The housing sheath portion is advanceable from a first position along the outer sidewall of the housing in which the fixation member portion is retracted toward the proximal end of the housing to a second position along the outer sidewall of the housing in which the fixation member portion is deployed to extend away from the housing distal end for anchoring the implantable medical device at an implant site.
    Type: Grant
    Filed: September 15, 2017
    Date of Patent: September 1, 2020
    Assignee: Medtronic, Inc.
    Inventors: Zhongping Yang, Thomas A. Anderson, Yong K. Cho, Becky L. Dolan, Rick D. Mcvenes
  • Patent number: 10751542
    Abstract: Techniques for minimizing rate of depletion of a non-rechargeable power source, to extend the operational lifetime of an implantable medical device that includes the non-rechargeable power source, by enforcing operational-mode-specific communication protocols whereby inter-device communication between the implantable medical device and another implantable medical device is such that level of power draw from the non-rechargeable power source by the implantable medical device is less than level of power draw from the rechargeable power source by the another implantable medical device for the implantable medical devices to engage in communication with each other.
    Type: Grant
    Filed: October 13, 2017
    Date of Patent: August 25, 2020
    Assignee: Medtronic, Inc.
    Inventors: Wade M. Demmer, Yong K. Cho, Michael F. Hess, Todd J. Sheldon
  • Publication number: 20200196948
    Abstract: Systems and methods include differential diagnosis for acute heart failure to provide treatment to a patient including determining whether the patient has cardiac volume overload, determining whether the patient has decreased abdominal venous system volume, and providing the appropriate treatment in response to the determinations. A multi-sensor system may be used to determine cardiac volume and abdominal venous system volume. Fluid redistribution treatment may be provided when cardiac volume overload is accompanied by a decrease in abdominal venous system volume. Fluid accumulation treatment may be provided when cardiac volume overload is not accompanied by a decrease in abdominal venous system volume.
    Type: Application
    Filed: December 20, 2019
    Publication date: June 25, 2020
    Inventors: Yong K. Cho, Tom D. Bennett, Douglas A. Hettrick, Charles P. Sperling, Paul A. Sobotka, Vinod Sharma, Eduardo N. Warman, Todd M. Zielinski
  • Publication number: 20200187865
    Abstract: Provided is a method, system and/or apparatus for determining prospective heart failure event risk. Acquired from a device memory are a heart failure patient's current and preceding risk assessment periods. Counting detected data observations in the current risk assessment period for a current risk assessment total amount and counting detected data observations in the preceding risk assessment period for a preceding risk assessment period total amount. Associating the current risk assessment and preceding risk assessment total amounts with a lookup table to acquire prospective risk of heart failure (HF) event for the preceding risk assessment period and the current risk assessment period. Employing weighted sums of the prospective risk of the HF event for the preceding risk assessment period and the current risk assessment period to calculate a weighted prospective risk of the HF event for a patient. Displaying on a graphical user interface the weighted prospective risk of the HF event for the patient.
    Type: Application
    Filed: December 10, 2019
    Publication date: June 18, 2020
    Inventors: Vinod Sharma, Eduardo N. Warman, Yong K. Cho, Shantanu Sarkar
  • Publication number: 20200121932
    Abstract: An intracardiac ventricular pacemaker is configured to detect a ventricular diastolic event from a motion signal received by a pacemaker control circuit from a motion sensor. The control circuit starts an atrial refractory period having an expiration time set based on a time of the detection of the ventricular diastolic event. The control circuit detects an atrial systolic event from the motion signal after expiration of the atrial refractory period and controls a pulse generator of the pacemaker to deliver a pacing pulse to a ventricle of a patient's heart at a first atrioventricular pacing time interval after the atrial systolic event detection.
    Type: Application
    Filed: December 19, 2019
    Publication date: April 23, 2020
    Inventors: Vincent E. SPLETT, Todd J. SHELDON, Yong K. CHO, Wade M. DEMMER, Mark K. ERICKSON
  • Publication number: 20200046983
    Abstract: An intracardiac ventricular pacemaker having a motion sensor is configured to produce a motion signal including an atrial systolic event and a ventricular diastolic event indicating a passive ventricular filling phase, set a detection threshold to a first amplitude during an expected time interval of the ventricular diastolic event and to a second amplitude lower than the first amplitude after an expected time interval of the ventricular diastolic event. The pacemaker is configured to detect the atrial systolic event in response to the motion signal crossing the detection threshold and set an atrioventricular pacing interval in response to detecting the atrial systolic event.
    Type: Application
    Filed: October 16, 2019
    Publication date: February 13, 2020
    Inventors: Vincent E. SPLETT, Todd J. SHELDON, Yong K. CHO, Wade M. DEMMER, Mark K. ERICKSON
  • Patent number: 10532212
    Abstract: An intracardiac ventricular pacemaker is configured to detect a ventricular diastolic event from a motion signal received by a pacemaker control circuit from a motion sensor. The control circuit starts an atrial refractory period having an expiration time set based on a time of the detection of the ventricular diastolic event. The control circuit detects an atrial systolic event from the motion signal after expiration of the atrial refractory period and controls a pulse generator of the pacemaker to deliver a pacing pulse to a ventricle of a patient's heart at a first atrioventricular pacing time interval after the atrial systolic event detection.
    Type: Grant
    Filed: September 29, 2016
    Date of Patent: January 14, 2020
    Assignee: Medtronic, Inc.
    Inventors: Vincent E Splett, Todd J Sheldon, Yong K Cho, Wade M Demmer, Mark K Erickson
  • Patent number: 10517542
    Abstract: Provided is a method, system and/or apparatus for determining prospective heart failure event risk. Acquired from a device memory are a heart failure patient's current and preceding risk assessment periods. Counting detected data observations in the current risk assessment period for a current risk assessment total amount and counting detected data observations in the preceding risk assessment period for a preceding risk assessment period total amount. Associating the current risk assessment and preceding risk assessment total amounts with a lookup table to acquire prospective risk of heart failure (HF) event for the preceding risk assessment period and the current risk assessment period. Employing weighted sums of the prospective risk of the HF event for the preceding risk assessment period and the current risk assessment period to calculate a weighted prospective risk of the HF event for a patient. Displaying on a graphical user interface the weighted prospective risk of the HF event for the patient.
    Type: Grant
    Filed: December 9, 2015
    Date of Patent: December 31, 2019
    Assignee: Medtronic, Inc.
    Inventors: Vinod Sharma, Eduardo N Warman, Yong K Cho, Shantanu Sarkar
  • Patent number: 10449366
    Abstract: An intracardiac ventricular pacemaker having a motion sensor is configured to produce a motion signal including an atrial systolic event and a ventricular diastolic event indicating a passive ventricular filling phase, set a detection threshold to a first amplitude during an expected time interval of the ventricular diastolic event and to a second amplitude lower than the first amplitude after an expected time interval of the ventricular diastolic event. The pacemaker is configured to detect the atrial systolic event in response to the motion signal crossing the detection threshold and set an atrioventricular pacing interval in response to detecting the atrial systolic event.
    Type: Grant
    Filed: September 29, 2016
    Date of Patent: October 22, 2019
    Assignee: Medtronic, Inc.
    Inventors: Vincent E Splett, Todd J Sheldon, Yong K Cho, Wade M Demmer, Mark K Erickson
  • Publication number: 20190308021
    Abstract: An intracardiac pacemaker system is configured to produce physiological atrial event signals by a sensing circuit of a ventricular intracardiac pacemaker and select a first atrial event input as the physiological atrial event signals. The ventricular intracardiac pacemaker detects atrial events from the selected first atrial event input, determines if input switching criteria are met, and switches from the first atrial event input to a second atrial event input in response to the input switching criteria being met. The second atrial event input includes broadcast atrial event signals produced by a second implantable medical device and received by the ventricular intracardiac pacemaker.
    Type: Application
    Filed: June 24, 2019
    Publication date: October 10, 2019
    Inventors: Wade M. DEMMER, Yong K. CHO, Mark K. ERICKSON, Todd J. SHELDON
  • Patent number: 10328270
    Abstract: An intracardiac pacemaker system is configured to produce physiological atrial event signals by a sensing circuit of a ventricular intracardiac pacemaker and select a first atrial event input as the physiological atrial event signals. The ventricular intracardiac pacemaker detects atrial events from the selected first atrial event input, determines if input switching criteria are met, and switches from the first atrial event input to a second atrial event input in response to the input switching criteria being met. The second atrial event input includes broadcast atrial event signals produced by a second implantable medical device and received by the ventricular intracardiac pacemaker.
    Type: Grant
    Filed: December 13, 2016
    Date of Patent: June 25, 2019
    Assignee: Medtronic, Inc.
    Inventors: Wade M Demmer, Yong K Cho, Mark K Erickson, Todd J Sheldon
  • Publication number: 20190184181
    Abstract: A device and method are described for transmitting tissue conductance communication (TCC) signals. A device may be is configured to establish a transmission window by transmitting a TCC test signal at multiple time points over a transmission test period to a receiving device and detect at least one response to the transmitted TCC test signals performed by the receiving device. The IMD is configured to establish the transmission window based on the at least one detected response so that the transmission window is correlated to a time of relative increased transimpedance between a transmitting electrode vector and receiving electrode vector during the transmission test period.
    Type: Application
    Filed: December 14, 2018
    Publication date: June 20, 2019
    Inventors: Yanzhu ZHAO, Yong K. CHO, Michael D. EGGEN, Wei GAN, Kathryn HILPISCH, Srikara V. PEELUKHANA, Darrell J. SWENSON, Joshua J. BLAUER
  • Patent number: 10286214
    Abstract: An intracardiac ventricular pacemaker having a motion sensor is configured to produce a motion signal including an atrial systolic event and at least one ventricular diastolic event. The pacemaker is configured to set an atrial refractory period, detect a change in a ventricular diastolic event metric and adjust the atrial refractory period in response to detecting the change. The pacemaker sets set an atrioventricular pacing interval in response to detecting the atrial systolic event from the motion signal after expiration of the atrial refractory period.
    Type: Grant
    Filed: November 3, 2016
    Date of Patent: May 14, 2019
    Assignee: Medtronic, Inc.
    Inventors: Wade M Demmer, Yong K Cho, Mark K Erickson, Michael F Hess, Todd J Sheldon, Vincent E Splett
  • Publication number: 20190111271
    Abstract: Techniques for minimizing rate of depletion of a non-rechargeable power source, to extend the operational lifetime of an implantable medical device that includes the non-rechargeable power source, by enforcing operational-mode-specific communication protocols whereby inter-device communication between the implantable medical device and another implantable medical device is such that level of power draw from the non-rechargeable power source by the implantable medical device is less than level of power draw from the rechargeable power source by the another implantable medical device for the implantable medical devices to engage in communication with each other.
    Type: Application
    Filed: October 13, 2017
    Publication date: April 18, 2019
    Inventors: Wade M. Demmer, Yong K. Cho, Michael F. Hess, Todd J. Sheldon
  • Publication number: 20190083801
    Abstract: An implantable medical device has a housing having a proximal end, a distal end and an outer sidewall extending from the proximal end to the distal end. A fixation sheath includes a housing sheath portion extending along the outer sidewall of the housing, and a fixation member portion extending from the housing sheath portion. The housing sheath portion is advanceable from a first position along the outer sidewall of the housing in which the fixation member portion is retracted toward the proximal end of the housing to a second position along the outer sidewall of the housing in which the fixation member portion is deployed to extend away from the housing distal end for anchoring the implantable medical device at an implant site.
    Type: Application
    Filed: September 15, 2017
    Publication date: March 21, 2019
    Inventors: Zhongping YANG, Thomas A. ANDERSON, Yong K. CHO, Becky L. DOLAN, Rick D. MCVENES
  • Patent number: 10226630
    Abstract: Various techniques for measuring cardiac cycle length and pressure metrics based on pulmonary artery pressures are described. One example method described includes identifying a point within a derivative signal of a cardiovascular pressure signal without reference to electrical activity of a heart, initiating a time window from the identified point in the derivative signal, identifying a point within the cardiovascular signal within the time window, and determining at least one of a systolic pressure or diastolic pressure based on the identified point.
    Type: Grant
    Filed: January 25, 2016
    Date of Patent: March 12, 2019
    Assignee: Medtronic, Inc.
    Inventors: Saul E Greenhut, Robert T Taepke, David R Bloem, Yong K Cho, Donna M Salmi
  • Patent number: 10207116
    Abstract: An intracardiac ventricular pacemaker is configured to operate in in a selected one of an atrial-tracking ventricular pacing mode and a non-atrial tracking ventricular pacing mode. A control circuit of the pacemaker determines at least one motion signal metric from the motion signal, compares the at least one motion signal metric to pacing mode switching criteria; and responsive to the pacing mode switching criteria being satisfied, switches from the selected one of the non-atrial tracking pacing mode and the atrial tracking pacing mode to the other one of the non-atrial tracking pacing mode and the atrial tracking pacing mode for controlling ventricular pacing pulses delivered by the pacemaker.
    Type: Grant
    Filed: December 1, 2016
    Date of Patent: February 19, 2019
    Assignee: Medtronic, Inc.
    Inventors: Todd J Sheldon, Yong K Cho, Wade M Demmer, Mark K Erickson, Vincent E Splett
  • Patent number: RE48197
    Abstract: A leadless pacing device (LPD) includes a motion sensor configured to generate a motion signal as a function of heart movement. The LPD is configured to analyze the motion signal within an atrial contraction detection window that begins an atrial contraction detection delay period after activation of the ventricle, and detect a contraction of an atrium of the heart based on the analysis of the motion signal within the atrial contraction detection window. If the LPD does not detect a ventricular depolarization subsequent to the atrial contraction, e.g., with an atrio-ventricular (AV) interval beginning when the atrial contraction was detected, the LPD delivers a ventricular pacing pulse.
    Type: Grant
    Filed: July 25, 2018
    Date of Patent: September 8, 2020
    Assignee: Medtronic, Inc.
    Inventors: Yong K. Cho, Aleksandre T. Sambelashvili, Todd J. Sheldon