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mri compatible electrode circuit

A circuit and electrode technology, applied in electrodes and other directions, can solve the problem of reducing RF induction heating, and achieve the effect of reducing RF induction heating

Active Publication Date: 2017-12-15
IMRICOR MEDICAL SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] MR compatible electrode circuits in accordance with the present invention address the deficiencies of conventional electrode wire configurations by providing improved apparatus and methods for reducing RF-induced heating of tissue by attenuating RF currents induced by MRI in medical devices

Method used

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Embodiment Construction

[0051] In describing the invention herein, reference is made to exemplary wire assemblies including catheters. However, as those skilled in the art will recognize, the present invention may be used with any implantable medical device. Implantable means permanently implantable, as in pacemakers, defibrillators, and neurostimulators; or temporarily implantable, as in interventional therapy, and includes, for example, cardiac ablation devices, among others. Additionally, the exemplary wire assemblies can be used outside the body while still in contact with body tissue (eg, skin). And as used herein, a wire electrode can be any conductive structure that is in electrical contact with an electrode. Typically, the wire electrode is an actual wire; however, the wire electrode could also be a circuit board trace, a conductive lumen, or any material that conducts electricity.

[0052] figure 1 is a block diagram illustrating a wire assembly 100 in its simplest form in accordance with...

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Abstract

An MRI compatible electrode circuit construct is provided. The construct includes at least two filter components constructed from an electrode wire. One filter component may be a single or multiple layer resonant LC filter positioned proximate an electrode that resolves the issue of insufficient attenuation by effectively blocking the RF induced current on the wire from exiting the wire through the electrode. The second filter component may include one or more non-resonant filter(s) positioned along the length of the electrode wire that resolve(s) the issue of excessive heating of the resonant LC filter by significantly attenuating the current induced on the wire before it reaches the resonant LC filter. The resonant LC filter may also be positioned distal to the end of the non-resonant filter.

Description

technical field [0001] The present invention relates to medical devices with tissue contacting electrodes for use in a magnetic resonance imaging (MRI) environment, and in particular to a method for attenuating electromagnetic fields applied to such devices during an MRI scan and equipment. Background technique [0002] MRI has been successful as a diagnostic imaging modality, and increasingly as an interventional imaging modality. The main benefits of MRI over other imaging modalities such as X-rays include superior soft-tissue imaging and avoidance of patient exposure to ionizing radiation produced by X-rays. The superior soft tissue imaging capabilities of MRI offer great clinical benefits for diagnostic imaging. Similarly, interventional treatments traditionally used X-ray imaging for guidance have greatly benefited from the soft tissue imaging capabilities of MRI. Furthermore, the use of MRI guidance eliminates the significant exposure of the patient to ionizing radi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61N1/04
Inventor 托马斯·W·劳埃德史蒂文·R·韦丹格雷格·S·斯滕策尔
Owner IMRICOR MEDICAL SYST