WO2005003790A3 - Magnetic resonance imaging interference immune device - Google Patents

Magnetic resonance imaging interference immune device Download PDF

Info

Publication number
WO2005003790A3
WO2005003790A3 PCT/US2004/020126 US2004020126W WO2005003790A3 WO 2005003790 A3 WO2005003790 A3 WO 2005003790A3 US 2004020126 W US2004020126 W US 2004020126W WO 2005003790 A3 WO2005003790 A3 WO 2005003790A3
Authority
WO
WIPO (PCT)
Prior art keywords
wire line
magnetic resonance
resonance imaging
interference immune
imaging interference
Prior art date
Application number
PCT/US2004/020126
Other languages
French (fr)
Other versions
WO2005003790A2 (en
Inventor
Robert W Gray
Paul G Simpson Iii
Michael L Weiner
Original Assignee
Biophan Technologies Inc
Robert W Gray
Paul G Simpson Iii
Michael L Weiner
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 Biophan Technologies Inc, Robert W Gray, Paul G Simpson Iii, Michael L Weiner filed Critical Biophan Technologies Inc
Priority to EP04755953A priority Critical patent/EP1636612A4/en
Priority to JP2006517577A priority patent/JP2007524458A/en
Priority to CA002517771A priority patent/CA2517771A1/en
Publication of WO2005003790A2 publication Critical patent/WO2005003790A2/en
Publication of WO2005003790A3 publication Critical patent/WO2005003790A3/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
    • A61N1/04—Electrodes
    • A61N1/05—Electrodes for implantation or insertion into the body, e.g. heart electrode
    • 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
    • G01R33/285—Invasive instruments, e.g. catheters or biopsy needles, specially adapted for tracking, guiding or visualization by NMR
    • 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
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
    • G01R33/34084—Constructional details, e.g. resonators, specially adapted to MR implantable coils or coils being geometrically adaptable to the sample, e.g. flexible coils or coils comprising mutually movable parts
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/42—Balance/unbalance networks
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
    • A61B2562/22—Arrangements of medical sensors with cables or leads; Connectors or couplings specifically adapted for medical sensors
    • A61B2562/221—Arrangements of sensors with cables or leads, e.g. cable harnesses
    • A61B2562/222—Electrical cables or leads therefor, e.g. coaxial cables or ribbon cables
    • 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 voltage compensation unit (410 or Figure 12) reduces the effects of induced voltages upon a device having a single wire line. The single wire line has balanced characteristic impedance. The voltage compensation unit includes a tunable compensation circuit (700 of Figure 20) connected to the wire line. The tunable compensation circuit (700 of Figure 20) applies supplemental impedance to the wire line. The supplemental impedance causes the characteristic impedance of the wire line to become unbalanced, thereby reducing the effects of induced voltages caused by changing magnetic fields.
PCT/US2004/020126 2003-06-24 2004-06-24 Magnetic resonance imaging interference immune device WO2005003790A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP04755953A EP1636612A4 (en) 2003-06-24 2004-06-24 Magnetic resonance imaging interference immune device
JP2006517577A JP2007524458A (en) 2003-06-24 2004-06-24 Magnetic resonance imaging interference immune device
CA002517771A CA2517771A1 (en) 2003-06-24 2004-06-24 Magnetic resonance imaging interference immune device

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US48217703P 2003-06-24 2003-06-24
US60/482,177 2003-06-24
US10/780,261 2004-02-17
US10/780,261 US6949929B2 (en) 2003-06-24 2004-02-17 Magnetic resonance imaging interference immune device

Publications (2)

Publication Number Publication Date
WO2005003790A2 WO2005003790A2 (en) 2005-01-13
WO2005003790A3 true WO2005003790A3 (en) 2005-12-15

Family

ID=33544506

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/020126 WO2005003790A2 (en) 2003-06-24 2004-06-24 Magnetic resonance imaging interference immune device

Country Status (5)

Country Link
US (4) US6949929B2 (en)
EP (1) EP1636612A4 (en)
JP (1) JP2007524458A (en)
CA (1) CA2517771A1 (en)
WO (1) WO2005003790A2 (en)

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US7742825B2 (en) 2010-06-22
US20040263172A1 (en) 2004-12-30
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US20040263174A1 (en) 2004-12-30
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CA2517771A1 (en) 2005-01-13

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