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Lead with MRI compatible design features

A wire, conductor wire technology, applied in the directions of treatment, cardiac electrodes, internal electrodes, etc., can solve the problem of introducing undesired voltage into the wire

Inactive Publication Date: 2010-12-22
CARDIAC PACEMAKERS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Exposure to magnetic fields can also introduce undesired voltages on the wires

Method used

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  • Lead with MRI compatible design features
  • Lead with MRI compatible design features
  • Lead with MRI compatible design features

Examples

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Embodiment Construction

[0010] figure 1 is a schematic diagram of an illustrative medical device 12 with leads implanted in a patient's body. In the illustrative embodiment shown, the medical device 12 includes a pulse generator implanted within the body. The pulse generator 12 is coupled to a lead 14 that is inserted into the patient's heart 16 . Heart 16 includes right atrium 18 , right ventricle 20 , left atrium 22 , and left ventricle 24 . The pulse generator 12 may be implanted subcutaneously in the body, typically at a location such as the patient's chest or abdomen, although other implant locations are possible.

[0011] Proximal portion 26 of lead 14 may be coupled to or integrally formed with pulse generator 12 . The distal portion 28 of the lead 14 may be implanted at a desired location within or near the heart 16, such as within the right ventricle 20 as shown. In use, one or more electrodes 30 on the distal portion 28 of the lead 14 may provide therapy to the patient in the form of an...

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Abstract

Implantable medical leads with magnetic shielding and methods of shielding implantable leads from magnetic fields during medical procedures such as magnetic resonance imaging (MRI) are disclosed. An exemplary implantable medical lead includes a helically coiled inner electrode conductor wire, a helically coiled outer electrode conductor wire disposed radially about the inner electrode conductor wire, and at least one layer of insulation that electrically isolates the inner and outer electrode conductor wires. The inner electrode conductor wire can have a hollowed, multifilar configuration including six or more co-radially wound wire filars. The outer electrode conductor wire is electrically isolated from the inner electrode conductor wire, and may have either a single or double filar configuration.

Description

technical field [0001] The present invention relates to medical devices and provides both diagnostic and therapeutic treatments. More particularly, the present invention relates to implantable medical leads with magnetic shielding and methods for shielding such leads from magnetic fields during medical procedures such as magnetic resonance imaging (MRI). Background technique [0002] Magnetic resonance imaging (MRI) is a non-invasive imaging method that uses magnetic resonance technology to present images of a patient's body. Typically, MRI systems use magnetic coils with magnetic field strengths between about 0.2 and 3 Tesla. In this procedure, body tissue is exposed to radiofrequency pulses of electromagnetic energy primarily in a plane perpendicular to the magnetic field. The resulting electromagnetic energy from these pulses can be used to image body tissue by measuring the relaxation properties of excited nuclei within the tissue. [0003] During imaging, electromagn...

Claims

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Application Information

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IPC IPC(8): A61N1/08
CPCA61N2001/086A61N1/056A61N1/086
Inventor 阿瑟·J·福斯特琼·M·鲍勃甘
Owner CARDIAC PACEMAKERS INC
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