Baltimore, MD, United States
Baltimore, MD, United States

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Bottomley P.A.,SurgiVision Inc. | Kumar A.,SurgiVision Inc. | Edelstein W.A.,SurgiVision Inc. | Allen J.M.,SurgiVision Inc. | Karmarkar P.V.,SurgiVision Inc.
Medical Physics | Year: 2010

Purpose: The presence of implanted electronic devices with conducting leads and electrodes are contraindicated for magnetic resonance imaging (MRI), denying many patients its potential benefits. The prime concern is MRI's radio frequency (RF) fields, which can cause elevated local specific absorption rates (SARs) and potential heat injury. The purpose of this article is to develop and compare a range of passive implantable "MRI-safe" lead designs. Methods: Conducting leads incorporating different lengths (3-75 cm), insulation thicknesses (0-105 μm), resistances (100-3000 Ω), coiled conductors (inner diameter ≤1.2 mm), high-impedance (135-2700 Ω) RF traps, and single-coiled and triple-coiled coaxial-wound "billabong" leads with reversed coil sections that oppose and reduce the induced current, are investigated both experimentally using local temperature measurements, and by numerical full-wave electromagnetic field analysis of the local SAR, in three different-sized bioanalogous model saline-gel phantoms at 1.5 T MRI and 4 W/kg exposure. Results: In all designs, the maximum computed 1 g average SAR and experimental temperature rise occur at the bare electrodes. Electrode heating increases with lead insulation thickness and peaks for uncoiled leads 25-50 cm long. A reasonable match between computed SAR and the point SAR estimated from thermal sensors obtained by approximating the computation volume to that of the thermal probes. Factors that maximize the impedance of leads with resistive, coiled, RF trap and billabong elements can effectively limit heating below 1-2 °C, but folded lead configurations can be a concern. The RF trap and billabong designs can both support multiple conductors and electrodes, with billabong prototype leads also heating <1 °C when tested for 3 T MRI. Conclusions: Lead insulation and length strongly affect implanted lead safety to RF exposure during MRI. Lead designs employing impedance and reversed winding sections offer hope for the development of passive, MRI-safe, implantable conducting leads for future human use. © 2010 American Association of Physicists in Medicine.


Patent
Boston Scientific Neuromodulation Corporation and Surgi Vision Inc. | Date: 2014-03-12

The present invention relates to an MRI safe lead system, comprising an elongate flexible lead with a plurality of conductors having a length with opposing proximal and distal end portions, the conductors each having a plurality of current suppression modules extending along the length of the conductor, each current suppression module comprising at least one coiled segment; and a plurality of electrodes, one or more of the conductors in communication with a respective one of the electrodes.


Trademark
MRI Interventions Inc and SurgiVision Inc. | Date: 2012-10-16

Medical devices for MRI guided medical procedures, namely, catheters for use in MRI guided medical procedures.


Trademark
SurgiVision Inc. | Date: 2010-07-27

MRI-compatible medical system comprised of an MRI-compatible surgical device for guiding, locating or placing a diagnostic device or therapeutic device, namely, stents, probes, needles, leads, grafts, pumps, syringes, catheters, and implants during a MRI-guided procedure and related software sold as a unit.


Trademark
MRI Interventions Inc and SurgiVision Inc. | Date: 2012-10-16

injection or aspiration cannula.


Trademark
MRI Interventions Inc and SurgiVision Inc. | Date: 2011-04-12

MRI-compatible patch or guide for identifying a location on the body to facilitate MRI-guided procedures.


A system and method for using magnetic resonance imaging to increase the accuracy of electrophysiologic procedures includes an invasive combined electrophysiology and imaging antenna catheter which includes an RF antenna for receiving magnetic resonance signals and diagnostic electrodes for receiving electrical potentials. The combined electrophysiology and imaging antenna catheter is used in combination with a magnetic resonance imaging scanner to guide and provide visualization during electrophysiologic diagnostic or therapeutic procedures, such as ablation of cardiac arrhythmias. The combined electrophysiology and imaging antenna catheter may further include an ablation tip, and be used as an intracardiac device to deliver energy to selected areas of tissue and visualize the resulting ablation lesions.


Patent
Surgivision Inc. and Boston Scientific Neuromodulation Corporation | Date: 2011-05-02

A lead for an electronic device which resists the induction of a current from an electromagnetic field external to said lead includes one or more pairs of adjacent segments of electrical wire, each of the pairs including a first segment of electrical wire and a second segment of electrical wire. The lead also includes one or more shielded RF chokes, wherein each of the shielded RF chokes is provided between the first segment of electrical wire and the second segment of electrical wire of a respective one of the one or more pairs of adjacent segments. Also, an implantable device that includes a generator for generating one or more electrical pulse and a lead as described for delivering the pulses to tissue within a patients body. A method for making the described implantable device is also provided.


MRI compatible localization and/or guidance systems for facilitating placement of an interventional therapy and/or device in vivo include: (a) a mount adapted for fixation to a patient; (b) a targeting cannula with a lumen configured to attach to the mount so as to be able to controllably translate in at least three dimensions; and (c) an elongate probe configured to snugly slidably advance and retract in the targeting cannula lumen, the elongate probe comprising at least one of a stimulation or recording electrode. In operation, the targeting cannula can be aligned with a first trajectory and positionally adjusted to provide a desired internal access path to a target location with a corresponding trajectory for the elongate probe. Automated systems for determining an MR scan plane associated with a trajectory and for determining mount adjustments are also described.


Patent
Boston Scientific Neuromodulation Corporation and Surgi Vision Inc. | Date: 2014-03-12

The present invention relates to a flexible medical lead having at least one conductor with the conductor turning back on itself in a lengthwise direction at least twice within the lead.

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