Patent
Non-ferromagnetic tank filters in lead wires of active implantable medical devices to enhance mri compatibility
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TLDR
In this paper, a TANK filter is provided for a lead wire of an active medical device (AMD), which includes a capacitor in parallel with an inductor, where values of capacitance and inductance are selected such that the filter is resonant at a selected frequency.Abstract:
A TANK filter is provided for a lead wire of an active medical device (AMD). The TANK filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the TANK filter is resonant at a selected frequency. In a preferred form, the TANK filter reduces or even eliminates the use of ferro-magnetic materials, and instead uses non-ferromagnetic materials so as to reduce or eliminate MRI image artifacts or the force or torque otherwise associated during an MRI image scan.read more
Citations
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Patent
Band stop filter employing a capacitor and an inductor tank circuit to enhance MRI compatibility of active medical devices
TL;DR: In this article, a band stop filter is provided for a lead wire of an active medical device (AMD), which includes a capacitor in parallel with an inductor, where values of capacitance and inductance are selected such that the band-stop filter is resonant at a selected frequency.
Patent
Methods and apparatus for fabricating leads with conductors and related flexible lead configurations
Paul A. Bottomley,Parag Karmarkar,Justin M. Allen,William A. Edelstein,Peter Piferi,Brian Gore +5 more
TL;DR: In this paper, the authors describe a set of leads that can be configured so that the lead heats local tissue less than about 10 degrees Celsius (typically about 5 degrees Celsius or less) or does not heat local tissue when a patient is exposed to target RF frequencies at a peak input SAR of at least about 4 W/kg and/or a whole body average SAR of approximately 2W/kg.
Patent
Mri and rf compatible leads and related methods of operating and fabricating leads
TL;DR: RF/MRI compatible leads include at least one conductor that turns back on itself at least twice in a lengthwise direction, and can turn back again at multiple locations along its length as discussed by the authors.
Patent
Shielded three-terminal flat-through EMI/energy dissipating filter
Robert A. Stevenson,Buehl E. Truex,Richard L. Brendel,Christine A. Frysz,Warren S. Dabney,Haytham Hussein,Jose Luis Lorente Adame,Robert Shawn Johnson,Scott Brainard +8 more
TL;DR: In this paper, 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.
Patent
Frequency selective passive component networks for implantable leads of active implantable medical devices utilizing an energy dissipating surface
Robert A. Stevenson,Warren S. Dabney,Christine A. Frysz,Buehl E. Truex,Henry R. Halperin,Albert C. Lardo +5 more
TL;DR: In this article, a frequency selective energy diversion circuit is provided for diverting highfrequency energy away from a leadwire electrode to a point or an area spaced from the electrode, for dissipation of high-frequency energy.
References
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Patent
Combination monophasic action potential/ablation catheter and high-performance filter system
TL;DR: In this article, a combination catheter for both detecting monophasic action potentials and ablating surface tissue in an in vivo heart of a patient is provided, which includes a catheter probe having a terminal tip portion (10) and an electrode (20) carried on the tip such that a portion of the tip electrode(20) is exposed to ambient.
Patent
Feed-through filter capacitor assembly for human implant
TL;DR: In this article, a feedthrough filter capacitor assembly and related installation method are provided for shielding a conductive terminal pin or lead of the type used, for example, in an implantable medical device such as a heart pacemaker or defibrillator, against passage of external interference signals.
PatentDOI
Ecg amplifier and cardiac pacemaker for use during magnetic resonance imaging
TL;DR: In this article, a device for monitoring a patient or pacing a patient is disclosed which can safely operate in a MRI system, which uses unique RF filtering and shielding to attenuate voltages on the leads resulting from the high frequency RF signals produced in the MRI.
Patent
Implantable medical device incorporating integrated circuit notch filters
TL;DR: In this paper, a planar spiral wound conductive traces are fabricated as high conductive metals to reduce trace height and width while maintaining low resistance, thereby reducing parasitic capacitances between adjacent trace side walls and with the ground plane of the IC chip.
Patent
Electromagnetic noise detector for implantable medical devices
Patrick J. Paul,David Prutchi +1 more
TL;DR: In this article, an apparatus and method for detecting electromagnetic interference (EMI), or noise, that may disrupt the proper operation of medical devices (10) implantable in patients, such as cardiac stimulators, is described.