Patents by Inventor Stuart G. MacDonald

Stuart G. MacDonald 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: 20180250507
    Abstract: An implantable medical assist device includes a medical device. The medical device has a housing and electronics contained therein. A lead provides an electrical path to or from the electronics within the medical device. A resonance tuning module is located in the housing and is connected to the lead. The resonance tuning module includes a control circuit for determining a resonant frequency of the implantable medical assist device and an adjustable impedance circuit to change the combined resonant frequency of the medical device and lead.
    Type: Application
    Filed: May 8, 2018
    Publication date: September 6, 2018
    Inventors: Robert W. Gray, Stuart G. MacDonald
  • Patent number: 9999764
    Abstract: An implantable medical assist device includes a medical device. The medical device has a housing and electronics contained therein. A lead provides an electrical path to or from the electronics within the medical device. A resonance tuning module is located in the housing and is connected to the lead. The resonance tuning module includes a control circuit for determining a resonant frequency of the implantable medical assist device and an adjustable impedance circuit to change the combined resonant frequency of the medical device and lead.
    Type: Grant
    Filed: April 21, 2015
    Date of Patent: June 19, 2018
    Assignee: Medtronic, Inc.
    Inventors: Robert W. Gray, Stuart G. MacDonald
  • Publication number: 20150224304
    Abstract: An implantable medical assist device includes a medical device. The medical device has a housing and electronics contained therein. A lead provides an electrical path to or from the electronics within the medical device. A resonance tuning module is located in the housing and is connected to the lead. The resonance tuning module includes a control circuit for determining a resonant frequency of the implantable medical assist device and an adjustable impedance circuit to change the combined resonant frequency of the medical device and lead.
    Type: Application
    Filed: April 21, 2015
    Publication date: August 13, 2015
    Inventors: Robert W. Gray, Stuart G. MacDonald
  • Patent number: 9037257
    Abstract: An implantable medical assist device includes a medical device. The medical device has a housing and electronics contained therein. A lead provides an electrical path to or from the electronics within the medical device. A resonance tuning module is located in the housing and is connected to the lead. The resonance tuning module includes a control circuit for determining a resonant frequency of the implantable medical assist device and an adjustable impedance circuit to change the combined resonant frequency of the medical device and lead.
    Type: Grant
    Filed: April 5, 2007
    Date of Patent: May 19, 2015
    Assignee: Medtronic, Inc.
    Inventors: Robert W. Gray, Stuart G. MacDonald
  • Patent number: 8849423
    Abstract: An electromagnetic interference immune defibrillator lead has a first electromagnetic insulating layer. A first layer is formed on the first electromagnetic insulating layer, the first layer having a plurality of first conductive rings composed of first conductive material, each first conductive ring being separated by first insulating material. A second electromagnetic insulating layer is formed on the first layer. A second layer is, formed on the second electromagnetic insulating layer, the second layer having a plurality of second conductive rings composed of second conductive material, each second conductive ring being separated by second insulating material. A third electromagnetic insulating layer is formed on the second layer. The second conductive rings of second conductive material are positioned such that a second conductive ring overlaps a portion of a first conductive ring and overlaps a portion of a second conductive ring, the second conductive ring being adjacent to the first conductive ring.
    Type: Grant
    Filed: September 15, 2010
    Date of Patent: September 30, 2014
    Assignee: Medtronic, Inc.
    Inventor: Stuart G. MacDonald
  • Patent number: 8768486
    Abstract: A medical device having a frequency independent circuit that substantially reduces induced currents in a lead assembly and at a tissue interface. The frequency independent circuit configures an electrical path such that a stimulation pulse travels from the medical device to a selected tissue, and a current induced by an external changing electromagnetic signal is prevented from travelling the electrical path from the selected tissue to the medical device.
    Type: Grant
    Filed: December 10, 2007
    Date of Patent: July 1, 2014
    Assignee: Medtronic, Inc.
    Inventors: Robert W. Gray, Stuart G. MacDonald, Lon E. Smith, Jr.
  • Publication number: 20120185016
    Abstract: Disclosed in this specification is an apparatus and method for treating a biological organism comprising a device for emitting and delivering energy to the biological organism, a programmable controller for varying the type and amount of energy emitted, and apparatus for sensing a condition of the biological organism.
    Type: Application
    Filed: December 20, 2011
    Publication date: July 19, 2012
    Applicant: Biomed Solutions LLC
    Inventors: Michael L. Weiner, Robert W. Gray, Stuart G. MacDonald, Jack A. Tuszynski, Amara D. Angelica, Kendrick Goss
  • Patent number: 8209029
    Abstract: An implantable medical assist device includes a medical device. The medical device has a housing and electronics contained therein. A lead provides an electrical path to or from the electronics within the medical device. A resonance tuning module is located in the housing and is connected to the lead. The resonance tuning module includes a control circuit for determining a resonant frequency of the implantable medical assist device and an adjustable impedance circuit to change the combined resonant frequency of the medical device and lead.
    Type: Grant
    Filed: October 29, 2007
    Date of Patent: June 26, 2012
    Assignee: Medtronic, Inc.
    Inventors: Robert W. Gray, Stuart G. MacDonald
  • Patent number: 8121705
    Abstract: The present invention reduces patient risks associated with RF-induced thermogenic tissue damage and with pulsed gradient-field-induced arrhythmias by using a defibrillator lead having a self-healing dielectric material that prevents induced voltages from MRI equipment from damaging an ICD or causing unintended defibrillation shocks to a patient. Another aspect of the present invention utilizes a sliding contact arrangement to prevent induced voltages from MRI equipment from being electrically coupled to an ICD thereby reducing patient risks associated with RF-induced thermogenic tissue damage and with pulsed gradient-field-induced arrhythmias.
    Type: Grant
    Filed: June 26, 2008
    Date of Patent: February 21, 2012
    Assignee: Medtronic, Inc.
    Inventor: Stuart G. MacDonald
  • Publication number: 20110004284
    Abstract: An electromagnetic interference immune defibrillator lead has a first electromagnetic insulating layer. A first layer is formed on the first electromagnetic insulating layer, the first layer having a plurality of first conductive rings composed of first conductive material, each first conductive ring being separated by first insulating material. A second electromagnetic insulating layer is formed on the first layer. A second layer is, formed on the second electromagnetic insulating layer, the second layer having a plurality of second conductive rings composed of second conductive material, each second conductive ring being separated by second insulating material. A third electromagnetic insulating layer is formed on the second layer. The second conductive rings of second conductive material are positioned such that a second conductive ring overlaps a portion of a first conductive ring and overlaps a portion of a second conductive ring, the second conductive ring being adjacent to the first conductive ring.
    Type: Application
    Filed: September 15, 2010
    Publication date: January 6, 2011
    Inventor: Stuart G. MacDonald
  • Patent number: 7865247
    Abstract: A medical device having a diode configuration in a lead assembly that substantially reduces induced currents in a lead assembly and at a tissue interface. The diodes configure an electrical path such that a stimulation pulse travels from the medical device to a selected tissue, and a current induced by an external changing electromagnetic signal is reduced and/or prevented from travelling the electrical path from the selected tissue to the medical device. The diodes may be at least partially contained in an electrode of the medical device.
    Type: Grant
    Filed: December 13, 2007
    Date of Patent: January 4, 2011
    Assignee: Medtronic, Inc.
    Inventors: Lon E. Smith, Jr., Stuart G. MacDonald, Robert W. Gray
  • Patent number: 7801625
    Abstract: An electromagnetic interference immune defibrillator lead has a first electromagnetic insulating layer. A first layer is formed on the first electromagnetic insulating layer, the first layer having a plurality of first conductive rings composed of first conductive material, each first conductive ring being separated by first insulating material. A second electromagnetic insulating layer is formed on the first layer. A second layer is, formed on the second electromagnetic insulating layer, the second layer having a plurality of second conductive rings composed of second conductive material, each second conductive ring being separated by second insulating material. A third electromagnetic insulating layer is formed on the second layer. The second conductive rings of second conductive material are positioned such that a second conductive ring overlaps a portion of a first conductive ring and overlaps a portion of a second conductive ring, the second conductive ring being adjacent to the first conductive ring.
    Type: Grant
    Filed: May 27, 2005
    Date of Patent: September 21, 2010
    Assignee: Medtronic, Inc.
    Inventor: Stuart G. MacDonald
  • Patent number: 7742825
    Abstract: A voltage compensation unit reduces the effects of induced voltages upon a device having a single wire line. The single wire line has balanced characteristic impedance. The voltage compensation unit includes a tunable compensation circuit connected to the wire line. The tunable compensation circuit applies supplemental impedance to the wire line. The supplemental impedance causes the characteristic impedance of the wire line to become unbalanced, thereby reducing the effects of induced voltages caused by changing magnetic fields.
    Type: Grant
    Filed: August 29, 2007
    Date of Patent: June 22, 2010
    Assignee: Medtronic, Inc.
    Inventors: Robert W. Gray, Stuart G. MacDonald
  • Publication number: 20100152523
    Abstract: Disclosed is a device for assisting the function of a heart that is collapsible to facilitate minimally invasive procedures. The cup-shaped device may be inserted into the chest cavity and deployed on the heart via a specially configured tube. The device comprises a cup-shaped shell expanded by a support cage disposed within the shell, and an elastic cup-shaped liner, together forming an inflatable cavity between the outer surface of the liner and the inner surface of the shell. Alternate application of positive and negative pressures to the cavity provides controlled, active, systolic and diastolic support to the heart.
    Type: Application
    Filed: November 28, 2006
    Publication date: June 17, 2010
    Applicant: MYOCARDIOCARE, INC.
    Inventors: Stuart G. MacDonald, Ruheri Anthony Perez-Tamayo, George w. Anstadt, Mark P. Anstadt
  • Patent number: 7729777
    Abstract: A voltage compensation unit reduces the effects of induced voltages upon a device having a single wire line. The single wire line has balanced characteristic impedance. The voltage compensation unit includes a tunable compensation circuit connected to the wire line. The tunable compensation circuit applies supplemental impedance to the wire line. The supplemental impedance causes the characteristic impedance of the wire line to become unbalanced, thereby reducing the effects of induced voltages caused by changing magnetic fields.
    Type: Grant
    Filed: July 8, 2004
    Date of Patent: June 1, 2010
    Assignee: Medtronic, Inc.
    Inventors: Robert W. Gray, Stuart G. MacDonald
  • Publication number: 20100076297
    Abstract: An electromagnetic immune tissue invasive system includes a primary device housing. The primary device housing having a control circuit therein. A shielding is formed around the primary device housing to shield the primary device housing and any circuits therein from electromagnetic interference. A lead system transmits and receives signals between the primary device housing. The lead system is either a fiber optic system or an electrically shielded electrical lead system.
    Type: Application
    Filed: December 19, 2008
    Publication date: March 25, 2010
    Applicant: BIOPHAN TECHNOLOGIES, INC.
    Inventors: Stuart G. MacDonald, Patrick R. Connelly
  • Patent number: 7555350
    Abstract: An electromagnetic interference immune defibrillator lead has a first electromagnetic insulating layer. A first layer is formed on the first electromagnetic insulating layer, the first layer having a plurality of first conductive rings composed of first conductive material, each first conductive ring being separated by first insulating material. A second electromagnetic insulating layer is formed on the first layer. A second layer is, formed on the second electromagnetic insulating layer, the second layer having a plurality of second conductive rings composed of second conductive material, each second conductive ring being separated by second insulating material. A third electromagnetic insulating layer is formed on the second layer. The second conductive rings of second conductive material are positioned such that a second conductive ring overlaps a portion of a first conductive ring and overlaps a portion of a second conductive ring, the second conductive ring being adjacent to the first conductive ring.
    Type: Grant
    Filed: May 27, 2005
    Date of Patent: June 30, 2009
    Assignee: Medtronic, Inc.
    Inventor: Stuart G. MacDonald
  • Patent number: 7551966
    Abstract: An electromagnetic interference immune defibrillator lead has a first electromagnetic insulating layer. A first layer is formed on the first electromagnetic insulating layer, the first layer having a plurality of first conductive rings composed of first conductive material, each first conductive ring being separated by first insulating material. A second electromagnetic insulating layer is formed on the first layer. A second layer is, formed on the second electromagnetic insulating layer, the second layer having a plurality of second conductive rings composed of second conductive material, each second conductive ring being separated by second insulating material. A third electromagnetic insulating layer is formed on the second layer. The second conductive rings of second conductive material are positioned such that a second conductive ring overlaps a portion of a first conductive ring and overlaps a portion of a second conductive ring, the second conductive ring being adjacent to the first conductive ring.
    Type: Grant
    Filed: May 27, 2005
    Date of Patent: June 23, 2009
    Assignee: Medtronic, Inc.
    Inventor: Stuart G. MacDonald
  • Patent number: 7539545
    Abstract: An electromagnetic interference immune defibrillator lead has a first electromagnetic insulating layer. A first layer is formed on the first electromagnetic insulating layer, the first layer having a plurality of first conductive rings composed of first conductive material, each first conductive ring being separated by first insulating material. A second electromagnetic insulating layer is formed on the first layer. A second layer is, formed on the second electromagnetic insulating layer, the second layer having a plurality of second conductive rings composed of second conductive material, each second conductive ring being separated by second insulating material. A third electromagnetic insulating layer is formed on the second layer. The second conductive rings of second conductive material are positioned such that a second conductive ring overlaps a portion of a first conductive ring and overlaps a portion of a second conductive ring, the second conductive ring being adjacent to the first conductive ring.
    Type: Grant
    Filed: May 27, 2005
    Date of Patent: May 26, 2009
    Assignee: Medtronic, Inc.
    Inventor: Stuart G. MacDonald
  • Patent number: 7539546
    Abstract: An electromagnetic interference immune defibrillator lead has a first electromagnetic insulating layer. A first layer is formed on the first electromagnetic insulating layer, the first layer having a plurality of first conductive rings composed of first conductive material, each first conductive ring being separated by first insulating material. A second electromagnetic insulating layer is formed on the first layer. A second layer is, formed on the second electromagnetic insulating layer, the second layer having a plurality of second conductive rings composed of second conductive material, each second conductive ring being separated by second insulating material. A third electromagnetic insulating layer is formed on the second layer. The second conductive rings of second conductive material are positioned such that a second conductive ring overlaps a portion of a first conductive ring and overlaps a portion of a second conductive ring, the second conductive ring being adjacent to the first conductive ring.
    Type: Grant
    Filed: May 27, 2005
    Date of Patent: May 26, 2009
    Assignee: Medtronic, Inc.
    Inventor: Stuart G. MacDonald