Patents by Inventor Robert Shawn Johnson
Robert Shawn Johnson 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).
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Patent number: 10183162Abstract: A coiled, closed-loop RF current attenuator is configured to be placed about an implantable lead conductor. A coiled conductor extends in a coiled shape defining a longitudinal axis from a first coil end to a second coil end. The first coil end is electrically connected to the second coil end. An insulator is disposed about the coiled conductor. The closed loop attenuator can also include in series a short, a capacitor and/or a resistor. In some embodiments the closed loop attenuator can be resonant at an MRI RF-pulsed frequency. The closed loop attenuator can be integrated as a permanent part of an implantable lead conductor, or alternatively, be a stand-alone device that is placed about a premade implantable lead conductor.Type: GrantFiled: January 1, 2016Date of Patent: January 22, 2019Assignee: Greatbatch Ltd.Inventors: Robert Shawn Johnson, Robert A. Stevenson
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Patent number: 10092749Abstract: An AIMD includes a conductive housing, an electrically conductive ferrule with an insulator hermetically sealing the ferrule opening. A conductive pathway is hermetically sealed and disposed through the insulator. A filter capacitor is disposed on a circuit board within the housing and has a dielectric body supporting at least two active and two ground electrode plates interleaved, wherein the at least two active electrode plates are electrically connected to the conductive pathway on the device side, and the at least two ground electrode plates are electrically coupled to either the ferrule and/or the conductive housing. The dielectric body has a dielectric constant less than 1000 and a capacitance of between 10 and 20,000 picofarads. The filter capacitor is configured for EMI filtering of MRI high RF pulsed power by a low ESR, wherein the ESR of the filter capacitor at an MRI RF pulsed frequency or range of frequencies is less than 2.0 ohms.Type: GrantFiled: September 14, 2017Date of Patent: October 9, 2018Assignee: Greatbatch Ltd.Inventors: Robert A. Stevenson, Robert Shawn Johnson, Warren S. Dabney, Thomas Marzano, Richard L. Brendel, Christopher Michael Williams, Holly Noelle Moschiano, Keith W. Seitz, John E. Roberts
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Publication number: 20180008822Abstract: An AIMD includes a conductive housing, an electrically conductive ferrule with an insulator hermetically sealing the ferrule opening. A conductive pathway is hermetically sealed and disposed through the insulator. A filter capacitor is disposed on a circuit board within the housing and has a dielectric body supporting at least two active and two ground electrode plates interleaved, wherein the at least two active electrode plates are electrically connected to the conductive pathway on the device side, and the at least two ground electrode plates are electrically coupled to either the ferrule and/or the conductive housing. The dielectric body has a dielectric constant less than 1000 and a capacitance of between 10 and 20,000 picofarads. The filter capacitor is configured for EMI filtering of MRI high RF pulsed power by a low ESR, wherein the ESR of the filter capacitor at an MRI RF pulsed frequency or range of frequencies is less than 2.0 ohms.Type: ApplicationFiled: September 14, 2017Publication date: January 11, 2018Inventors: Robert A. Stevenson, Robert Shawn Johnson, Warren S. Dabney, Thomas Marzano, Richard L. Brendel, Christopher Michael Williams, Holly Noelle Moschiano, Keith W. Seitz, John E. Roberts
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Patent number: 9764129Abstract: An AIMD includes a conductive housing, an electrically conductive ferrule with an insulator hermetically sealing the ferrule opening. A conductive pathway is hermetically sealed and disposed through the insulator. A filter capacitor is disposed on a circuit board within the housing and has a dielectric body supporting at least two active and two ground electrode plates interleaved, wherein the at least two active electrode plates are electrically connected to the conductive pathway on the device side, and the at least two ground electrode plates are electrically coupled to either the ferrule and/or the conductive housing. The dielectric body has a dielectric constant less than 1000 and a capacitance of between 10 and 20,000 picofarads. The filter capacitor is configured for EMI filtering of MRI high RF pulsed power by a low ESR, wherein the ESR of the filter capacitor at an MRI RF pulsed frequency or range of frequencies is less than 2.0 ohms.Type: GrantFiled: May 24, 2016Date of Patent: September 19, 2017Assignee: Greatbatch Ltd.Inventors: Robert A. Stevenson, Robert Shawn Johnson, Warren S. Dabney, Thomas Marzano, Richard L. Brendel, Christopher Michael Williams, Holly Noelle Moschiano, Keith W. Seitz, John E. Roberts
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Patent number: 9757558Abstract: An AIMD includes a conductive housing, an electrically conductive ferrule with an insulator hermetically sealing the ferrule opening. A conductive pathway is hermetically sealed and disposed through the insulator. A filter capacitor is disposed within the housing and has a dielectric body supporting at least two active and two ground electrode plates interleaved, wherein the at least two active electrode plates are electrically connected to the conductive pathway on the device side, and the at least two ground electrode plates are electrically coupled to either the ferrule and/or the conductive housing. The dielectric body has a dielectric constant less than 1000 and a capacitance of between 10 and 20,000 picofarads. The filter capacitor is configured for EMI filtering of MRI high RF pulsed power by a low ESR, wherein the ESR of the filter capacitor at an MRI RF pulsed frequency or range of frequencies is less than 2.0 ohms.Type: GrantFiled: April 16, 2015Date of Patent: September 12, 2017Assignee: Greatbatch Ltd.Inventors: Robert A. Stevenson, Robert Shawn Johnson, Warren S. Dabney, Thomas Marzano, Richard L. Brendel, Christopher Michael Williams, Holly Noelle Moschiano, Keith W. Seitz, John E. Roberts
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Publication number: 20160263373Abstract: An AIMD includes a conductive housing, an electrically conductive ferrule with an insulator hermetically sealing the ferrule opening. A conductive pathway is hermetically sealed and disposed through the insulator. A filter capacitor is disposed on a circuit board within the housing and has a dielectric body supporting at least two active and two ground electrode plates interleaved, wherein the at least two active electrode plates are electrically connected to the conductive pathway on the device side, and the at least two ground electrode plates are electrically coupled to either the ferrule and/or the conductive housing. The dielectric body has a dielectric constant less than 1000 and a capacitance of between 10 and 20,000 picofarads. The filter capacitor is configured for EMI filtering of MRI high RF pulsed power by a low ESR, wherein the ESR of the filter capacitor at an MRI RF pulsed frequency or range of frequencies is less than 2.0 ohms.Type: ApplicationFiled: May 24, 2016Publication date: September 15, 2016Inventors: Robert A. Stevenson, Robert Shawn Johnson, Warren S. Dabney, Thomas Marzano, Richard L. Brendel, Christopher Michael Williams, Holly Noelle Moschiano, Keith W. Seitz, John E. Roberts
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Publication number: 20160193461Abstract: A coiled, closed-loop RF current attenuator is configured to be placed about an implantable lead conductor. A coiled conductor extends in a coiled shape defining a longitudinal axis from a first coil end to a second coil end. The first coil end is electrically connected to the second coil end. An insulator is disposed about the coiled conductor. The closed loop attenuator can also include in series a short, a capacitor and/or a resistor. In some embodiments the closed loop attenuator can be resonant at an MRI RF-pulsed frequency. The closed loop attenuator can be integrated as a permanent part of an implantable lead conductor, or alternatively, be a stand-alone device that is placed about a premade implantable lead conductor.Type: ApplicationFiled: January 1, 2016Publication date: July 7, 2016Inventors: Robert Shawn Johnson, Robert A. Stevenson
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Patent number: 9254377Abstract: A multilayer helical wave filter having a primary resonance at a selected RF diagnostic or therapeutic frequency or frequency range, includes an elongated conductor forming at least a portion of an implantable medical lead. The elongated conductor includes a first helically wound segment having at least one planar surface, a first end and a second end, which forms a first inductive component, and a second helically wound segment having at least one planar surface, a first end and a second end, which forms a second inductive element. The first and second helically wound segments are wound in the same longitudinal direction and share a common longitudinal axis. Planar surfaces of the helically wound segments face one another, and a dielectric material is disposed between the facing planar surfaces of the helically wound segments and between adjacent coils of the helically wound segments, thereby forming a capacitance.Type: GrantFiled: July 30, 2012Date of Patent: February 9, 2016Assignee: Greatbatch Ltd.Inventors: Kishore Kumar Kondabatni, Warren S. Dabney, Robert Shawn Johnson, Robert A. Stevenson, Christine A. Frysz
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Publication number: 20150217111Abstract: An AIMD includes a conductive housing, an electrically conductive ferrule with an insulator hermetically sealing the ferrule opening. A conductive pathway is hermetically sealed and disposed through the insulator. A filter capacitor is disposed within the housing and has a dielectric body supporting at least two active and two ground electrode plates interleaved, wherein the at least two active electrode plates are electrically connected to the conductive pathway on the device side, and the at least two ground electrode plates are electrically coupled to either the ferrule and/or the conductive housing. The dielectric body has a dielectric constant less than 1000 and a capacitance of between 10 and 20,000 picofarads. The filter capacitor is configured for EMI filtering of MRI high RF pulsed power by a low ESR, wherein the ESR of the filter capacitor at an MRI RF pulsed frequency or range of frequencies is less than 2.0 ohms.Type: ApplicationFiled: April 16, 2015Publication date: August 6, 2015Inventors: Robert A. Stevenson, Robert Shawn Johnson, Warren S. Dabney, Thomas Marzano, Richard L. Brendel, Christopher Michael Williams, Holly Noelle Moschiano, Keith W. Seitz, John E. Roberts
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Publication number: 20150207484Abstract: A composite RF current attenuator for a medical lead includes a conductor having a distal electrode contactable to biological cells, a bandstop filter in series with the lead conductor for attenuating RF currents flow through the lead conductor at a selected center frequency or across a range of frequencies about the center frequency, and a lowpass filter in series with the bandstop filter and forming a portion of the lead conductor. The bandstop filter has a capacitance in parallel with a first inductance. In a preferred form, the lowpass filter includes a second inductance in series with the bandstop filter, wherein the values of capacitance and inductances for the composite RF current attenuator are selected such that it attenuates MRI-induced RF current flow in an MRI environment.Type: ApplicationFiled: March 26, 2015Publication date: July 23, 2015Inventors: Robert A. Stevenson, Robert Shawn Johnson, Kishore Kumar Kondabatni, Joseph E. Spaulding, Dominick J. Frustaci, Warren S. Dabney, Holly Noelle Moschiano
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Patent number: 9071221Abstract: A composite RF current attenuator for a medical lead includes a conductor having a distal electrode contactable to biological cells, a bandstop filter in series with the lead conductor for attenuating RF currents flow through the lead conductor at a selected center frequency or across a range of frequencies about the center frequency, and a lowpass filter in series with the bandstop filter and forming a portion of the lead conductor. The bandstop filter has a capacitance in parallel with a first inductance. In a preferred form, the lowpass filter includes a second inductance in series with the bandstop filter, wherein the values of capacitance and inductances for the composite RF current attenuator are selected such that it attenuates MRI-induced RF current flow in an MRI environment.Type: GrantFiled: March 26, 2015Date of Patent: June 30, 2015Assignee: Greatbatch Ltd.Inventors: Robert A. Stevenson, Robert Shawn Johnson, Kishore Kumar Kondabatni, Joseph E. Spaulding, Dominick J. Frustaci, Warren S. Dabney, Holly Noelle Moschiano
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Patent number: 9061132Abstract: The present invention provides embodiments in which induced RF current heating along the length of a medical lead is reduced. Reduction of induced RF current heating in the medical lead is achieved by positioning a conductor about the exterior of an implantable medical device when the device is placed within an MRI environment. In one embodiment, an RF conductor is incorporated within a header assembly for connecting an implantable medical device to at least one conductor lead. The body of the RF conductor is positioned circumferentially around the implantable medical device. In another embodiment, the medical lead is positioned circumferentially around the exterior of the housing of the medical device. A series of clips or a sleeve holds the medical lead or RF conductor in place around the device.Type: GrantFiled: February 21, 2012Date of Patent: June 23, 2015Assignee: Greatbatch Ltd.Inventors: Jeffrey Zweber, Robert Shawn Johnson
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Patent number: 9037258Abstract: An energy management system that facilitates the transfer of high frequency energy induced on an implanted lead or a leadwire includes an energy dissipating surface associated with the implanted lead or the leadwire, a diversion or diverter circuit associated with the energy dissipating surface, and at least one switch disposed between the diversion circuit and the AIMD electronics for diverting energy in the implanted lead or the leadwire through the diversion circuit to the energy dissipating surface. The switch may comprise a single or multi-pole double or single throw switch. The diversion circuit may be either a high pass filter or a low pass filter.Type: GrantFiled: May 20, 2013Date of Patent: May 19, 2015Assignee: Greatbatch Ltd.Inventors: Robert Shawn Johnson, Warren S. Dabney, Robert A. Stevenson, Christopher Michael Williams, Holly Noelle Moschiano, Scott Brainard
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Patent number: 9031670Abstract: A shielded component or network for an active medical device (AMD) implantable lead includes an implantable lead having a length extending from a proximal end to a distal end, all external of an AMD housing, a passive component or network disposed somewhere along the length of the implantable lead, the passive component or network including at least one inductive component having a first inductive value, and an electromagnetic shield substantially surrounding the inductive component or the passive network. The first inductive value of the inductive component is adjusted to account for a shift in its inductance to a second inductive value when shielded.Type: GrantFiled: April 29, 2014Date of Patent: May 12, 2015Assignee: Greatbatch Ltd.Inventors: Warren S. Dabney, Robert Shawn Johnson, Holly Noelle Moschiano, Robert A. Stevenson, Henry R. Halperin, Albert C. Lardo, Kishore Kumar Kondabatni
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Patent number: 9008799Abstract: A bandstop filter having optimum component values is provided for a lead of an active implantable medical device (AIMD). The bandstop filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the implantable lead of the AIMD, wherein values of capacitance and inductance are selected such that the bandstop filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the bandstop filter to attenuate current flow through the implantable lead along a range of selected frequencies.Type: GrantFiled: April 8, 2014Date of Patent: April 14, 2015Assignee: Greatbatch Ltd.Inventors: Robert A. Stevenson, Warren S. Dabney, Robert Shawn Johnson, Holly Noelle Moschiano, Henry R. Halperin
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Patent number: 8996126Abstract: A composite RF current attenuator for a medical lead includes a conductor having a distal electrode contactable to biological cells, a bandstop filter in series with the lead conductor for attenuating RF currents flow through the lead conductor at a selected center frequency or across a range of frequencies about the center frequency, and a lowpass filter in series with the bandstop filter and forming a portion of the lead conductor. The bandstop filter has a capacitance in parallel with a first inductance. In a preferred form, the lowpass filter includes a second inductance in series with the bandstop filter, wherein the values of capacitance and inductances for the composite RF current attenuator are selected such that it attenuates MRI-induced RF current flow in an MRI environment.Type: GrantFiled: February 21, 2012Date of Patent: March 31, 2015Assignee: Greatbatch Ltd.Inventors: Robert A. Stevenson, Robert Shawn Johnson, Kishore Kumar Kondabatni, Joseph Spaulding, Dominick J. Frustaci, Warren S. Dabney, Holly Noelle Moschiano
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Patent number: 8989870Abstract: An energy management system facilitates the transfer of high frequency energy coupled into an implanted lead at a selected RF frequency or frequency band, to an energy dissipating surface. This is accomplished by conductively coupling the implanted lead to the energy dissipating surface through an energy diversion circuit including one or more passive electronic network components whose impedance characteristics are at least partially tuned to the implanted lead's impedance characteristics.Type: GrantFiled: January 12, 2010Date of Patent: March 24, 2015Assignee: Greatbatch Ltd.Inventors: Robert Shawn Johnson, Warren S. Dabney, Robert A. Stevenson, Christopher Michael Williams, Holly Noelle Moschiano, Scott Brainard, Daniel Robert Kaiser, Henry R. Halperin, Albert C. Lardo
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Patent number: 8977355Abstract: A bandstop filter having optimum component values is provided for a lead of an active implantable medical device (AIMD). The bandstop filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the implantable lead of the AIMD, wherein values of capacitance and inductance are selected such that the bandstop filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the bandstop filter to attenuate current flow through the implantable lead along a range of selected frequencies.Type: GrantFiled: February 17, 2010Date of Patent: March 10, 2015Assignee: Greatbatch Ltd.Inventors: Robert A. Stevenson, Warren S. Dabney, Robert Shawn Johnson, Holly Noelle Moschiano, Henry R. Halperin
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Publication number: 20150066124Abstract: A shielded three-terminal flat-through EMI/energy dissipating filter includes an active electrode plate through which a circuit current passes between a first terminal and a second terminal, a first shield plate on a first side of the active electrode plate, and a second shield plate on a second side of the active electrode plate opposite the first shield plate. The first and second shield plates are conductively coupled to a grounded third terminal. In preferred embodiments, the active electrode plate and the shield plates are at least partially disposed with a hybrid flat-through substrate that may include a flex cable section, a rigid cable section, or both.Type: ApplicationFiled: October 1, 2014Publication date: March 5, 2015Inventors: Robert A. Stevenson, Christine A. Frysz, Warren S. Dabney, Robert Shawn Johnson
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Patent number: 8918189Abstract: A shielded component or network for an active medical device (AMD) implantable lead includes (1) an implantable lead having a length extending from a proximal end to a distal end, all external of an AMD housing, (2) a passive component or network disposed somewhere along the length of the implantable lead, the passive component or network including at least one inductive component having a first inductive value, and (3) an electromagnetic shield substantially surrounding the inductive component or the passive network. The first inductive value of the inductive component is adjusted to a account for a shift in its inductance to a second inductive value when shielded.Type: GrantFiled: February 20, 2014Date of Patent: December 23, 2014Assignee: Greatbatch Ltd.Inventors: Warren S. Dabney, Robert Shawn Johnson, Holly Noelle Moschiano, Robert A. Stevenson, Henry R. Halperin, Albert C. Lardo, Kishore Kumar Kondabatni