Patents by Inventor Mark T. Stewart

Mark T. Stewart 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: 11364072
    Abstract: Methods, systems, and devices for enhancing the efficiency and efficacy of energy delivery and tissue mapping. One system includes a treatment element having a plurality of electrodes and an energy generator that is configured to deliver electric energy pulses to the electrodes in a variety of patterns. For example, electrodes may be arranged in closely spaced pairs. The energy generator may deliver mapping energy to each electrode in each pair individually to map tissue and may deliver ablation energy to the electrodes in each pair together, such that each pair is treated like a single electrode, to deliver ablation energy, such as bipolar ablation energy between adjacent pairs. One system includes at least one concave electrode, the configuration of which concentrates the energy and drives it deeper into the tissue. One system includes neutral electrodes between active electrodes, the energy generator selectively coupling the neutral electrodes to alter the ablation pattern.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: June 21, 2022
    Assignee: Medtronic, Inc.
    Inventors: Brian T. Howard, Mark T. Stewart, Damijan Miklav{hacek over (c)}i{hacek over (c)}, Bushan K. Purushothaman, Jeremy M. Stimack
  • Publication number: 20220168043
    Abstract: A medical device comprising an elongate body having a proximal portion, a distal portion, a distal end, a longitudinal axis, and a radius, a plurality of deployable arms, the deployable arms being movably coupled to the elongate body, and at least one arm from the plurality of deployable arms having at least one electrically conductive surface. The plurality of deployable arms being movable from a collapsed configuration to an expanded configuration. In the collapsed configuration, the plurality of deployable arms are approximately parallel to the longitudinal axis. In the expanded configuration, the at least one electrically conductive surface is distal facing and is positioned radially from the longitudinal axis by a distance that is greater than the radius of the elongate body.
    Type: Application
    Filed: February 15, 2022
    Publication date: June 2, 2022
    Inventors: Mark T. Stewart, Jordon D. Honeck
  • Publication number: 20220133389
    Abstract: A method of determining a pulsed field ablation waveform parameter for creating a desired lesion characteristic in cardiac tissue. The method of provides an electrosurgical generator configured to deliver electroporation pulses, the generator configured to: load predetermined waveform parameters (yi); load predetermined modeling data (xi); accept entry of a user inputted desired lesion characteristic (ui); and determine at least one corresponding pulsed field ablation waveform parameter based on (ui), (yi); and (xi).
    Type: Application
    Filed: January 18, 2022
    Publication date: May 5, 2022
    Inventors: Brian T. Howard, Steven J. Fraasch, Mark T. Stewart, John Vandanacker
  • Patent number: 11318306
    Abstract: A method, system, and device for electroporation. A system may include a medical device with a plurality of electrodes borne on an expandable element and an energy generator in communication with the electrodes. The energy generator may have processing circuitry configured to selectively deliver electroporation energy to at least one of the electrodes. The processing circuitry may determine whether an alert condition is present and, if so, cease the delivery of electroporation energy to one or more electrodes identified as the cause of the alert condition and/or prevent the delivery of electroporation energy to the one or more electrodes identified as the cause of the alert condition. The energy generator may also be configured to deliver electroporation energy in a sequence of a plurality of energy delivery patterns to enhance lesion formation.
    Type: Grant
    Filed: September 17, 2019
    Date of Patent: May 3, 2022
    Assignee: Medtronic, Inc.
    Inventors: Mark T. Stewart, Brian T. Howard
  • Patent number: 11278349
    Abstract: A medical system, including a medical device having a plurality of deployable arms, and at least one electrode on at least one of the plurality of arms; and an electric signal generator in communication with the medical device, the electric signal generator programmed to deliver pulsed energy to the medical device sufficient to induce irreversible electroporation ablation.
    Type: Grant
    Filed: November 2, 2015
    Date of Patent: March 22, 2022
    Assignee: Medtronic Ablation Frontiers LLC
    Inventors: Mark T. Stewart, Jordon D. Honeck
  • Patent number: 11229478
    Abstract: A method of determining a pulsed field ablation waveform parameter for creating a desired lesion characteristic in cardiac tissue. The method of provides an electrosurgical generator configured to deliver electroporation pulses, the generator configured to: load predetermined waveform parameters (yi); load predetermined modeling data (xi); accept entry of a user inputted desired lesion characteristic (ui); and determine at least one corresponding pulsed field ablation waveform parameter based on (ui), (yi); and (xi).
    Type: Grant
    Filed: February 8, 2017
    Date of Patent: January 25, 2022
    Assignee: Medtronic, Inc.
    Inventors: Brian T. Howard, Steven J. Fraasch, Mark T. Stewart, John Vandanacker
  • Publication number: 20220000550
    Abstract: The present invention advantageously provides a molding device with conductive material for creating a catheter balloon with conductive elements, and methods and systems for manufacturing the catheter balloon with conductive elements. An exemplary method for coupling a plurality of conductive elements to an expandable element may include placing a first portion of a mold proximate a second portion of the mold to define a casting cavity. Conductive material may be deposited into the casting cavity. Polymeric material may be inserted into the casting cavity. The first portion of the mold may be secured to the second portion of the mold. The polymeric material may be expanded to place the polymeric material in contact with the conductive material.
    Type: Application
    Filed: September 15, 2021
    Publication date: January 6, 2022
    Inventors: Mark E. Henschel, Brian T. Howard, Timothy G. Laske, Kenneth C. Gardeski, Gonzalo Martinez, Mark T. Stewart, Lars M. Mattison
  • Publication number: 20210401493
    Abstract: A method of ablating tissue with pulse field ablation energy includes generating a single pulse of energy between a first set of one or more conducting elements of a first polarity and a second set of one or more conducting elements of a second polarity, the single pulse of energy having a first pulse width and consecutively generating pulses of energy with opposite polarity to that of the single pulse of energy, the pulses having a collective pulse width equal to the first pulse width.
    Type: Application
    Filed: June 24, 2021
    Publication date: December 30, 2021
    Inventors: Brian T. Howard, Mark T. Stewart, Lars M. Mattison
  • Publication number: 20210369340
    Abstract: A medical device including a catheter having a proximal portion and a distal portion. A plurality of electrodes is disposed along the distal portion, the plurality of electrodes including a first electrode pair having a first fixed polarity and a second electrode pair having a second fixed polarity different than the first fixed polarity. A first lumen extends through the distal portion, the first lumen includes a first conductor configured to connect to a first electrode of the first electrode pair and a second conductor configured to connect to a second electrode of the first electrode pair. A second lumen extends through the distal portion and separated from the first lumen, the second lumen includes a third conductor configured to connect to a first electrode of the second electrode pair and a fourth conductor configured to connect to a second electrode of the second electrode pair.
    Type: Application
    Filed: May 3, 2021
    Publication date: December 2, 2021
    Inventors: Brian T. Howard, Mark T. Stewart, Lars M. Mattison
  • Publication number: 20210369321
    Abstract: A method of creating a shunt between a right atrium and a left atrium of a mammalian heart including puncturing an atrial septum between the right atrium and the left atrium to create a shunt. An ablation device having balloon is advanced at least partially through the shunt. The balloon is inflated and configured to thermally isolate the atrial septum from blood within the left atrium and the right atrium. Ablation energy is delivered to ablate the atrial septum.
    Type: Application
    Filed: August 11, 2021
    Publication date: December 2, 2021
    Inventors: Zhongping Yang, Nicolas Coulombe, Anthony W. Rorvick, Brian D. Pederson, Randal Schulhauser, David A. Anderson, Joseph D. Brannan, Mark T. Stewart, Jean-Pierre Lalonde
  • Publication number: 20210315629
    Abstract: A method of creating a shunt between a right atrium and a left atrium of a mammalian heart including puncturing an atrial septum between the right atrium and the left atrium to create a shunt. An ablation device having balloon is advanced at least partially through the shunt. The balloon is inflated and configured to thermally isolate the atrial septum from blood within the left atrium and the right atrium. Ablation energy is delivered to ablate the atrial septum.
    Type: Application
    Filed: February 23, 2021
    Publication date: October 14, 2021
    Inventors: Zhongping Yang, Anthony W. Rorvick, Brian D. Pederson, Randal Schulhauser, Nicolas Coulombe, David A. Anderson, Joseph D. Brannan, Mark T. Stewart, Jean-Pierre Lalonde
  • Publication number: 20210267677
    Abstract: A method and system for mapping tissue and producing lesions for the treatment of cardiac arrhythmias in a non-thermal and optimal manner, minimizing the amount of energy required to selectively stun or ablate the target tissues. Energy may be delivered only at the moment(s) of best device position and proximity of an electrode to target tissue, and only during a time in the cardiac cycle determined to be optimal for reversible or irreversible effects. A method may include determining timing of the cardiac cycle and an optimal time within the cardiac cycle for energy delivery, evaluating proximity between at least one energy delivery electrode and the target tissue, and delivering pulsed field energy from the at least one energy delivery electrode to the target tissue when, during the optimal time for energy delivery, the at least one energy delivery electrode is in close proximity with the target tissue.
    Type: Application
    Filed: May 17, 2021
    Publication date: September 2, 2021
    Inventors: Mark T. STEWART, Catherine R. CONDIE, Jay L. KELLEY
  • Patent number: 11052246
    Abstract: A method, system, and device for electroporation. A system may include a medical device with a plurality of electrodes borne on an expandable element and an energy generator in communication with the electrodes. The energy generator may have processing circuitry configured to selectively deliver electroporation energy to at least one of the electrodes. The processing circuitry may determine whether an alert condition is present and, if so, cease the delivery of electroporation energy to one or more electrodes identified as the cause of the alert condition and/or prevent the delivery of electroporation energy to the one or more electrodes identified as the cause of the alert condition. The energy generator may also be configured to deliver electroporation energy in a sequence of a plurality of energy delivery patterns to enhance lesion formation.
    Type: Grant
    Filed: July 28, 2017
    Date of Patent: July 6, 2021
    Assignee: Medtronic, Inc.
    Inventors: Mark T. Stewart, Brian T. Howard
  • Patent number: 11033329
    Abstract: A method and system for mapping tissue and producing lesions for the treatment of cardiac arrhythmias in a non-thermal and optimal manner, minimizing the amount of energy required to selectively stun or ablate the target tissues. Energy may be delivered only at the moment(s) of best device position and proximity of an electrode to target tissue, and only during a time in the cardiac cycle determined to be optimal for reversible or irreversible effects. A method may include determining timing of the cardiac cycle and an optimal time within the cardiac cycle for energy delivery, evaluating proximity between at least one energy delivery electrode and the target tissue, and delivering pulsed field energy from the at least one energy delivery electrode to the target tissue when, during the optimal time for energy delivery, the at least one energy delivery electrode is in close proximity with the target tissue.
    Type: Grant
    Filed: March 20, 2019
    Date of Patent: June 15, 2021
    Assignee: Medtronic Ablation Frontiers LLC
    Inventors: Mark T. Stewart, Catherine R. Condie, Jay L. Kelley
  • Publication number: 20210161453
    Abstract: The present invention relates to a method, device, and system for improved mapping and/or ablation of a tissue. The device may generally include an elongate body and a distal assembly affixed to the elongate body that includes a treatment electrode having a conductive mapping region and a selectively conductive ablation region that is conductive of high-frequency current and substantially non-conductive of low-frequency current. Alternatively, the device may generally include a treatment electrode having a conductive mapping or ablation region and a region that is coated with an electrically insulated but thermally conductive layer.
    Type: Application
    Filed: February 11, 2021
    Publication date: June 3, 2021
    Inventors: Mark T. Stewart, Mark Allen Benscoter, Jon Virgil Evans, Timothy G. Laske, Gonzalo Martinez
  • Publication number: 20210145515
    Abstract: A device, system, and method for optically evaluating and treating or ablating tissue. Specifically, device, system, and method allow for the optical and/or electrical evaluation of tissue at the same location(s) at which ablation or treatment or ablation energy is delivered. This allows for a more accurate evaluation of lesion formation and tissue condition before, during, and/or after a treatment or ablation procedure. In one embodiment, a device for performing a medical procedure includes an elongate body including a proximal portion, a distal portion having a distal end, and a longitudinal axis, and a distal tip electrode at the elongate body distal end, the tip electrode being optically transparent and electrically conductive. The device may also include optical windows in the elongate body aligned with one or more transparent lateral electrodes for optically interrogating tissue and/or for delivering treatment or ablation energy to tissue.
    Type: Application
    Filed: February 1, 2021
    Publication date: May 20, 2021
    Inventors: Gonzalo Martinez, Timothy G. Laske, Mark T. Stewart
  • Patent number: 10945625
    Abstract: The present invention relates to a method, device, and system for improved mapping and/or ablation of a tissue. The device may generally include an elongate body and a distal assembly affixed to the elongate body that includes a treatment electrode having a conductive mapping region and a selectively conductive ablation region that is conductive of high-frequency current and substantially non-conductive of low-frequency current. Alternatively, the device may generally include a treatment electrode having a conductive mapping or ablation region and a region that is coated with an electrically insulated but thermally conductive layer.
    Type: Grant
    Filed: July 19, 2018
    Date of Patent: March 16, 2021
    Assignee: Medtronic Ablation Frontiers LLC
    Inventors: Mark T. Stewart, Mark Allen Benscoter, Jon Virgil Evans, Timothy G. Laske, Gonzalo Martinez
  • Patent number: 10939959
    Abstract: A device, system, and method for optically evaluating and treating or ablating tissue. Specifically, device, system, and method allow for the optical and/or electrical evaluation of tissue at the same location(s) at which ablation or treatment or ablation energy is delivered. This allows for a more accurate evaluation of lesion formation and tissue condition before, during, and/or after a treatment or ablation procedure. In one embodiment, a device for performing a medical procedure includes an elongate body including a proximal portion, a distal portion having a distal end, and a longitudinal axis, and a distal tip electrode at the elongate body distal end, the tip electrode being optically transparent and electrically conductive. The device may also include optical windows in the elongate body aligned with one or more transparent lateral electrodes for optically interrogating tissue and/or for delivering treatment or ablation energy to tissue.
    Type: Grant
    Filed: October 17, 2017
    Date of Patent: March 9, 2021
    Assignee: Medtronic, Inc.
    Inventors: Gonzalo Martinez, Timothy G. Laske, Mark T. Stewart
  • Publication number: 20210038283
    Abstract: A system and method for the safe delivery of treatment energy to a patient, which includes verification of system integrity before, during, or after the delivery of treatment energy and provides several mechanisms for rapid termination of the delivery of potentially harmful energy to the patient when a fault condition in the device and/or system is identified. The system may include an energy generator having processing circuitry to determine if there is a fault condition in the system and to automatically terminate a delivery of treatment energy when the processing circuitry determines there is a fault condition. The method may generally include performing a series of pre-checks, synchronizing a treatment energy delivery to the proper segment of the heart's depolarization pattern, configuring the system for treatment energy delivery, delivering the treatment energy, and performing post-treatment evaluation.
    Type: Application
    Filed: October 23, 2020
    Publication date: February 11, 2021
    Inventors: Steven J. Fraasch, Catherine R. Condie, Brian T. Howard, Louis Jacob, Paul S. Lam, Trenton J. Rehberger, Mark T. Stewart, Qin Zhang
  • Patent number: 10881456
    Abstract: A medical method is provided, including a medical device having a distal assembly including at least one electrode and at least one treatment element, the medical device generating information regarding at least one of a physiological measurement and an operational parameter of the medical device; a plurality of surface electrodes affixable to a skin of the patient, wherein the surface electrodes are in electrical communication with the distal assembly to obtain position information of the medical device; and a processor pairing the position information and the at least one of a physiological measurement and an operational parameter of the medical device.
    Type: Grant
    Filed: December 13, 2017
    Date of Patent: January 5, 2021
    Assignee: Medtronic Ablation Frontiers LLC
    Inventors: Randell L. Werneth, Marshall Sherman, Mark T. Stewart, J. Christopher Flaherty