CA2487140A1 - Magnetic resonance probes - Google Patents

Magnetic resonance probes Download PDF

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Publication number
CA2487140A1
CA2487140A1 CA002487140A CA2487140A CA2487140A1 CA 2487140 A1 CA2487140 A1 CA 2487140A1 CA 002487140 A CA002487140 A CA 002487140A CA 2487140 A CA2487140 A CA 2487140A CA 2487140 A1 CA2487140 A1 CA 2487140A1
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CA
Canada
Prior art keywords
probe
disposed
magnetic resonance
center conductors
partially
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA002487140A
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French (fr)
Other versions
CA2487140C (en
Inventor
Parag Karmarkar
Ingmar Viohl
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ClearPoint Neuro Inc
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2487140A1 publication Critical patent/CA2487140A1/en
Application granted granted Critical
Publication of CA2487140C publication Critical patent/CA2487140C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • G01R33/287—Invasive instruments, e.g. catheters or biopsy needles, specially adapted for tracking, guiding or visualization by NMR involving active visualization of interventional instruments, e.g. using active tracking RF coils or coils for intentionally creating magnetic field inhomogeneities

Abstract

A magnetic resonance probe may include a plurality of center conductors, at least some center conductors including a conductive core and an insulator disposed at least partially about the core along at least a portion of the core, a first dielectric layer disposed at least partially about the plurali ty of center conductors in a proximal portion of the probe, an outer constructi ve layer at least partially disposed about the first dielectric layer, and a plurality of electrodes, at least one electrode being coupled to one of the center conductors and disposed at least partly on a probe surface.

Claims (20)

1. A magnetic resonance probe, comprising:
a plurality of center conductors, at least some center conductors including a conductive core and an insulator disposed at least partially about the core along at least a portion of the core;
a first dielectric layer disposed at least partially about the plurality of center conductors in a proximal portion of the probe;
an outer conductive layer at least partially disposed about the first dielectric layer; and a plurality of electrodes, at least one electrode being coupled to one of the center conductors and disposed at least partly on a probe surface.
2. The probe of claim 1, further comprising a second dielectric layer at least partially disposed about the outer conductive layer.
3. The probe of claim 1, further comprising a lubricious coating at least partially disposed about the outer conductive layer.
4. The probe of claim 1, wherein the plurality of center conductors are magnetic resonance-compatible.
5. The probe of claim 1, wherein at least one insulator has a thickness equal to or less than about 100 microns.
6. The probe of claim 1, wherein at least some center conductors comprise at least one of a magnetic resonance compatible material, a super elastic material, copper, silver-copper, gold, silver, platinum, iridium, MP35N, tantalum, titanium, Nitinol, L605, gold-platinum-iridium, gold-copper-iridium, and gold-platinum.
7. The probe of claim 1, wherein at least some center conductors form a first pole of a dipole antenna, and the outer conductive layer forms a second pole of the dipole antenna.
8. The probe of claim 1, further comprising a connection to a high-pass filter through which the probe is coupleable to a magnetic resonance scanner.
9. The probe of claim 1, further comprising a connection to a low-pass filter through which the probe is coupleable to at least one of an electrophysiological recording system, a tissue stimulator, and an ablation energy source.
10. The probe of claim 1, further comprising:
a ribbon disposed in a distal portion of the probe; and a pull wire coupled to the ribbon.
11. The probe of claim 10, wherein the pull wire is disposed in a lumen in the probe.
12. The probe of claim 1, further comprising a coolant lumen.
13. The probe of claim 1, further comprising a plurality of radially expandable arms, wherein at least one electrode is at least partly disposed on one arm.
14. The probe of claim 1, further comprising an ablation electrode disposed at a distal tip of the probe.
15. The probe of claim 1, further comprising an interface circuit coupled to the probe, the interface circuit including:
a signal splitter that directs a signal received from the probe to a magnetic resonance pathway and an electrophysiology pathway;
a high-pass filter disposed in the magnetic resonance pathway;

a low-pass filter disposed in the electrophysiology pathway;
a connector disposed in the magnetic resonance pathway for connecting to a magnetic resonance scanner; and a connector disposed in the electrophysiology pathway for connecting to at least one of a tissue stimulator, a biopotential recording system, and an ablation energy source.
16. The probe of claim 1, wherein the probe as an outer diameter of less than about 15 French.
17. The probe of claim 1, wherein the probe as an outer diameter of less than about 4 French.
18. The probe of claim 1, further comprising a connector portion disposed at a proximal end of the probe, the connector portion including:
an outer conductor contact coupled to the outer conductive layer;
extended sections of at least some center conductors extending proximally beyond the outer conductor contact, at least one extended section having a center conductor contact coupled to one center conductor; and an insulated area interposed between the outer conductor contact and the at least one center conductor contact.
19. A combined magnetic resonance imaging and electrophysiology probe, comprising:
a plurality of center conductors, at least some center conductors including a conductive core and an insulator disposed at least partially about the core along at least a portion of the core, the insulator having a thickness equal to or less than about 100 microns;

a first dielectric layer disposed at least partially about the plurality of center conductors in a proximal portion of the probe;
an outer conductive layer at least partially disposed about the first dielectric layer;
a second dielectric layer disposed at least partially about the outer conductive layer; and a plurality of electrodes, at least one electrode coupled to one of the center conductors and disposed at least partly on the probe surface.
20. A system for magnetic resonance imaging, comprising:
a magnetic resonance probe, including:
a plurality of center conductors, at least some center conductors including a conductive core and an insulator disposed at least partially about the core along at least a portion of the core;
a first dielectric layer disposed at least partially about the plurality of center conductors in a proximal portion of the probe;
an outer conductive layer disposed at least partially about the first dielectric layer; and a plurality of electrodes, at least one electrode coupled to one of the center conductors and disposed at least partly on the probe surface; and a interface electrically coupled to the probe, the interface including:
a signal splitter that directs a signal received from the probe to a magnetic resonance pathway and an electrophysiology pathway;
a high-pass filter disposed in the magnetic resonance pathway;

a low-pass filter disposed in the electrophysiology pathway;
a connector disposed in the magnetic resonance pathway for connecting to a magnetic resonance scanner; and a connector disposed in the electrophysiology pathway for connecting to at least one of a tissue stimulator, a electrophysiological recording system, and an ablation energy source.
CA2487140A 2002-05-29 2003-05-29 Magnetic resonance probes Expired - Lifetime CA2487140C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US38382802P 2002-05-29 2002-05-29
US60/383,828 2002-05-29
PCT/US2003/017085 WO2003102614A1 (en) 2002-05-29 2003-05-29 Magnetic resonance probes

Publications (2)

Publication Number Publication Date
CA2487140A1 true CA2487140A1 (en) 2003-12-11
CA2487140C CA2487140C (en) 2011-09-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2487140A Expired - Lifetime CA2487140C (en) 2002-05-29 2003-05-29 Magnetic resonance probes

Country Status (6)

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US (4) US6904307B2 (en)
EP (1) EP1508051A1 (en)
JP (1) JP2006512104A (en)
AU (2) AU2003249665B2 (en)
CA (1) CA2487140C (en)
WO (1) WO2003102614A1 (en)

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US6904307B2 (en) 2005-06-07
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WO2003102614A1 (en) 2003-12-11

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