Patents by Inventor Todd J. Sheldon

Todd J. Sheldon 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).

  • Patent number: 12370371
    Abstract: A medical device is configured to determine a rate smoothing pacing interval based on at a ventricular cycle length ending with a ventricular pacing pulse and determine a post-sense ventricular pacing interval based on a ventricular cycle length ending with a sensed ventricular event signal. The medical device may be configured to start a ventricular pacing interval set to the post-sense ventricular pacing interval in response to the sensed ventricular event signal and generate a ventricular pacing pulse in response to the expiration of the post-sense ventricular pacing interval.
    Type: Grant
    Filed: March 17, 2022
    Date of Patent: July 29, 2025
    Assignee: Medtronic, Inc.
    Inventors: Todd J. Sheldon, Keelia M. Escalante, Yanina Grinberg, Aaron M. Saikin
  • Patent number: 12357834
    Abstract: A medical device is configured to receive a cardiac signal and determine a morphology matching score from the cardiac signal and a capture detection morphology template that corresponds to a first type of cardiac pacing capture that includes capture of at least a first portion of the His-Purkinje system. The device is configured to detect a second type of cardiac pacing capture in response to the morphology matching score being less than the first match threshold. The second type of cardiac pacing capture is different than the first type of cardiac pacing capture and may include capture of the ventricular myocardium and/or a second portion of the His-Purkinje system different than the first portion.
    Type: Grant
    Filed: November 22, 2021
    Date of Patent: July 15, 2025
    Assignee: Medtronic, Inc.
    Inventors: Jian Cao, Wade M. Demmer, Elizabeth A. Mattson, Todd J. Sheldon, Xiaohong Zhou
  • Patent number: 12324920
    Abstract: This disclosure is directed to devices and techniques for classifying of pacing captures to evaluate effectiveness of pacing by a pacing device, such as an implantable medical device (IMD). An example system includes stimulation circuitry to generate a pacing stimulus, sensing circuitry to sense an evoked response after the pacing stimulus, and processing circuitry. The processing circuitry determines classification features from the evoked response and applies the classification features to a classification model, the classification model generated by a machine learning algorithm using one or more test sets comprising a plurality of sample evoked responses for each of a plurality of classifications. Based on the output of the model, the processing circuitry classifies the evoke response as one of the plurality of classifications.
    Type: Grant
    Filed: August 12, 2021
    Date of Patent: June 10, 2025
    Assignee: Medtronic, Inc.
    Inventors: Jian Cao, Elizabeth A. Mattson, Todd J. Sheldon, Xiaohong Zhou, Wade M. Demmer
  • Publication number: 20250177756
    Abstract: A medical device is configured to produce a cardiac motion signal by sampling a signal produced by an axis of a motion sensor, starting a blanking period, suspending the sampling of the signal during at least a portion of the blanking period, and restarting the sampling of the signal at the sampling frequency before the blanking period has expired. The medical device may detect a cardiac event from the cardiac motion signal and generate a pacing pulse in response to detecting the cardiac event in some examples.
    Type: Application
    Filed: January 31, 2025
    Publication date: June 5, 2025
    Inventors: Todd J. SHELDON, Vincent P. GANION, Greggory R. HERR, Michael L. HUDZIAK, Juliana E. PRONOVICI, Paul R. SOLHEIM
  • Patent number: 12311182
    Abstract: A medical device is configured to sense a cardiac electrical signal and detect an atrial tachyarrhythmia based on the sensed cardiac electrical signal. The medical device is configured to determine that far field oversensing criteria are met by the cardiac electrical signal during the detected atrial tachyarrhythmia. The medical device may detect termination of the detected atrial tachyarrhythmia in response to the far field oversensing criteria being met.
    Type: Grant
    Filed: February 10, 2022
    Date of Patent: May 27, 2025
    Assignee: Medtronic, Inc.
    Inventors: Saul E. Greenhut, Mark L. Brown, Vincent P. Ganion, Yanina Grinberg, Troy E. Jackson, Todd J. Sheldon, Shravya Srigiri, Paul R. Solheim
  • Publication number: 20250128074
    Abstract: A pacemaker is configured to operate in an atrial synchronous ventricular pacing mode and, after expiration of a conduction check time interval, switch to an asynchronous ventricular pacing mode that includes setting a ventricular pacing interval to a base pacing rate interval. The pacemaker is further configured to determine when atrioventricular block detection criteria are satisfied during the asynchronous ventricular pacing mode and, responsive to the atrioventricular block detection criteria being satisfied, switch back to the atrial synchronous ventricular pacing mode.
    Type: Application
    Filed: December 30, 2024
    Publication date: April 24, 2025
    Inventors: Juliana E. PRONOVICI, James W. BUSACKER, Keelia M. ESCALANTE, Vincent P. GANION, Greggory R. HERR, Todd J. SHELDON, Vincent E. SPLETT
  • Publication number: 20250114615
    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, 2024
    Publication date: April 10, 2025
    Inventors: Vincent E. SPLETT, Todd J. SHELDON, Yong K. CHO, Wade M. DEMMER, Mark K. ERICKSON
  • Publication number: 20250114616
    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: December 19, 2024
    Publication date: April 10, 2025
    Inventors: Vincent E. SPLETT, Todd J. SHELDON, Yong K. CHO, Wade M. DEMMER, Mark K. ERICKSON
  • Patent number: 12251567
    Abstract: An intracardiac ventricular pacemaker having a motion sensor, a pulse generator and a control circuit coupled to the pulse generator and the motion sensor is configured to identify a ventricular systolic event, detect a ventricular passive filling event signal from the motion signal, and determine a time interval from the ventricular systolic event to the ventricular passive filling event. The pacemaker establishes a minimum pacing interval based on the time interval.
    Type: Grant
    Filed: November 19, 2021
    Date of Patent: March 18, 2025
    Assignee: Medtronic, Inc.
    Inventors: Wade M. Demmer, Juliana E. Pronovici, Todd J. Sheldon
  • Patent number: 12251566
    Abstract: A ventricular pacemaker is configured to determine a ventricular rate interval by determining at least one ventricular event interval between two consecutive ventricular events and determine a rate smoothing ventricular pacing interval based on the ventricular rate interval. The pacemaker is further configured to detect an atrial event from a sensor signal and deliver a ventricular pacing pulse in response to detecting the atrial event from the sensor signal. The pacemaker may start the rate smoothing ventricular pacing interval to schedule a next pacing pulse to be delivered upon expiration of the rate smoothing ventricular pacing interval.
    Type: Grant
    Filed: March 22, 2023
    Date of Patent: March 18, 2025
    Assignee: Medtronic, Inc.
    Inventors: Todd J. Sheldon, Wade M. Demmer, Vincent P. Ganion, Juliana E. Pronovici, Vincent E. Splett, Menglong Xing
  • Publication number: 20250065132
    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: November 11, 2024
    Publication date: February 27, 2025
    Inventors: Wade M. DEMMER, Yong K. CHO, Mark K. ERICKSON, Todd J. SHELDON
  • Patent number: 12233267
    Abstract: An implantable medical device is configured determine a numerical value of a variable that is monitored by the implantable medical device and convert the numerical value to a data sequence of modulated electrical stimulation rate intervals. The implantable medical device delivers electrical stimulation pulses according to the data sequence of modulated stimulation rate intervals to cause a modulated rate of activation of excitable tissue of a patient corresponding to the modulated stimulation rate intervals. The modulated rate of activation is detectable by a rate monitor for demodulation to the numerical value of the monitored variable data value. In some examples, the implantable medical device is a pacemaker delivering cardiac pacing pulses according to modulated pacing rate intervals to cause a modulated heart rate of the patient detectable by a heart rate monitor for demodulation to the numerical value of the monitored variable.
    Type: Grant
    Filed: September 30, 2022
    Date of Patent: February 25, 2025
    Assignee: Medtronic, Inc.
    Inventors: Wade M. Demmer, Todd J. Sheldon
  • Patent number: 12220585
    Abstract: A medical device is configured to produce a cardiac motion signal by sampling a signal produced by an axis of a motion sensor, starting a blanking period, suspending the sampling of the signal during at least a portion of the blanking period, and restarting the sampling of the signal at the sampling frequency before the blanking period has expired. The medical device may detect a cardiac event from the cardiac motion signal and generate a pacing pulse in response to detecting the cardiac event in some examples.
    Type: Grant
    Filed: December 3, 2021
    Date of Patent: February 11, 2025
    Assignee: Medtronic, Inc.
    Inventors: Todd J. Sheldon, Vincent P. Ganion, Greggory R. Herr, Michael L. Hudziak, Juliana E. Pronovici, Paul R. Solheim
  • Patent number: 12214208
    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: April 18, 2022
    Date of Patent: February 4, 2025
    Assignee: Medtronic, Inc.
    Inventors: Vincent E. Splett, Todd J. Sheldon, Yong K. Cho, Wade M. Demmer, Mark K. Erickson
  • Patent number: 12194303
    Abstract: A pacemaker is configured to operate in an atrial synchronous ventricular pacing mode and, after expiration of a conduction check time interval, switch to an asynchronous ventricular pacing mode that includes setting a ventricular pacing interval to a base pacing rate interval. The pacemaker is further configured to determine when atrioventricular block detection criteria are satisfied during the asynchronous ventricular pacing mode and, responsive to the atrioventricular block detection criteria being satisfied, switch back to the atrial synchronous ventricular pacing mode.
    Type: Grant
    Filed: February 25, 2022
    Date of Patent: January 14, 2025
    Assignee: Medtronic, Inc.
    Inventors: Juliana E. Pronovici, James W. Busacker, Keelia M. Escalante, Vincent P. Ganion, Greggory R. Herr, Todd J. Sheldon, Vincent E. Splett
  • Patent number: 12186569
    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: May 25, 2022
    Date of Patent: January 7, 2025
    Assignee: Medtronic, Inc.
    Inventors: Vincent E. Splett, Todd J. Sheldon, Yong K. Cho, Wade M. Demmer, Mark K. Erickson
  • Publication number: 20240416132
    Abstract: A medical device includes a motion sensor for producing a motion signal including cardiac event signals. The medical device generates a ventricular pacing pulse upon expiration of a pacing interval. The medical device determines a synchrony metric from the motion signal after a delivered ventricular pacing pulse and adjusts the pacing interval based on the synchrony metric.
    Type: Application
    Filed: August 28, 2024
    Publication date: December 19, 2024
    Inventors: Wade M. DEMMER, Alexander R. MATTSON, Todd J. SHELDON, Zhongping YANG
  • Patent number: 12138461
    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: August 2, 2021
    Date of Patent: November 12, 2024
    Assignee: Medtronic, Inc.
    Inventors: Wade M. Demmer, Yong K. Cho, Mark K. Erickson, Todd J. Sheldon
  • Publication number: 20240315633
    Abstract: An implantable medical device is configured to determine a first atrial arrhythmia score from ventricular events sensed by a sensing circuit of an implantable medical device and determine a second atrial arrhythmia score from an intraventricular signal comprising atrial mechanical event signals attendant to atrial systole and produced by a sensor of the implantable medical device. An atrial arrhythmia is detected based on the first atrial arrhythmia score and the second atrial arrhythmia score.
    Type: Application
    Filed: May 29, 2024
    Publication date: September 26, 2024
    Inventors: Shantanu SARKAR, Wade M. DEMMER, Todd J. SHELDON, Vincent E. SPLETT
  • Publication number: 20240307696
    Abstract: An implantable medical device system receives a cardiac electrical signal produced by a patient's heart and comprising atrial P-waves and delivers a His bundle pacing pulse to the patient's heart via a His pacing electrode vector. The system determines a timing of a sensed atrial P-wave relative to the His bundle pacing pulse and determines a type of capture of the His bundle pacing pulse in response to the determined timing of the atrial P-wave.
    Type: Application
    Filed: May 29, 2024
    Publication date: September 19, 2024
    Inventors: Todd J. SHELDON, Elizabeth A. MATTSON, Eric R. WILLIAMS, Zhongping YANG, Shawn M. CAMPBELL