WO2008073445A3 - Medical leads with frequency independent magnetic resonance imaging protection - Google Patents

Medical leads with frequency independent magnetic resonance imaging protection Download PDF

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Publication number
WO2008073445A3
WO2008073445A3 PCT/US2007/025366 US2007025366W WO2008073445A3 WO 2008073445 A3 WO2008073445 A3 WO 2008073445A3 US 2007025366 W US2007025366 W US 2007025366W WO 2008073445 A3 WO2008073445 A3 WO 2008073445A3
Authority
WO
WIPO (PCT)
Prior art keywords
frequency independent
magnetic resonance
resonance imaging
independent magnetic
medical leads
Prior art date
Application number
PCT/US2007/025366
Other languages
French (fr)
Other versions
WO2008073445A2 (en
Inventor
Robert W Gray
Stuart G Macdonald
Original Assignee
Medtronic Inc
Robert W Gray
Stuart G Macdonald
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Medtronic Inc, Robert W Gray, Stuart G Macdonald filed Critical Medtronic Inc
Publication of WO2008073445A2 publication Critical patent/WO2008073445A2/en
Publication of WO2008073445A3 publication Critical patent/WO2008073445A3/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/362—Heart stimulators
    • A61N1/37—Monitoring; Protecting
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/02—Details
    • A61N1/08—Arrangements or circuits for monitoring, protecting, controlling or indicating
    • A61N1/086—Magnetic resonance imaging [MRI] compatible leads
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/362—Heart stimulators
    • A61N1/37—Monitoring; Protecting
    • A61N1/3718—Monitoring of or protection against external electromagnetic fields or currents
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/288—Provisions within MR facilities for enhancing safety during MR, e.g. reduction of the specific absorption rate [SAR], detection of ferromagnetic objects in the scanner room

Abstract

A medical device (1000) having a frequency independent circuit (1220) that substantially reduces induced currents in a lead assembly (1120) and at a tissue interface. The frequency independent circuit (1220) configures an electrical path such that a stimulation pulse travels from the medical device (1000) to a selected tissue, and a current induced by an external changing electromagnetic signal is prevented from travelling the electrical path from the selected tissue to the medical device.
PCT/US2007/025366 2006-12-11 2007-12-11 Medical leads with frequency independent magnetic resonance imaging protection WO2008073445A2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US86950706P 2006-12-11 2006-12-11
US60/869,507 2006-12-11
US11/953,443 2007-12-10
US11/953,443 US8768486B2 (en) 2006-12-11 2007-12-10 Medical leads with frequency independent magnetic resonance imaging protection

Publications (2)

Publication Number Publication Date
WO2008073445A2 WO2008073445A2 (en) 2008-06-19
WO2008073445A3 true WO2008073445A3 (en) 2008-08-21

Family

ID=39232783

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/025366 WO2008073445A2 (en) 2006-12-11 2007-12-11 Medical leads with frequency independent magnetic resonance imaging protection

Country Status (2)

Country Link
US (1) US8768486B2 (en)
WO (1) WO2008073445A2 (en)

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US10391320B2 (en) 2011-01-28 2019-08-27 Medtronic, Inc. Techniques for detecting magnetic resonance imaging field
US8810245B2 (en) 2011-02-10 2014-08-19 Biotronik Se & Co. Kg Device for generating opposing fields and method for operating a magnetic resonance scanner
US9981124B2 (en) * 2012-04-26 2018-05-29 Medtronic, Inc. Devices and techniques for detecting magnetic resonance imaging field
US20140114381A1 (en) 2012-10-23 2014-04-24 Medtronic, Inc. Mr-compatible implantable medical lead
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Also Published As

Publication number Publication date
US8768486B2 (en) 2014-07-01
WO2008073445A2 (en) 2008-06-19
US20080147154A1 (en) 2008-06-19

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