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
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M25/00—Catheters; Hollow probes
  • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
  • A61M25/0105—Steering means as part of the catheter or advancing means; Markers for positioning
  • A61M25/0127—Magnetic means; Magnetic markers
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M25/00—Catheters; Hollow probes
  • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
  • A61M25/09—Guide wires
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
  • A61B90/39—Markers, e.g. radio-opaque or breast lesions markers
  • A61B2090/3954—Markers, e.g. radio-opaque or breast lesions markers magnetic, e.g. NMR or MRI
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M25/00—Catheters; Hollow probes
  • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
  • A61M25/09—Guide wires
  • A61M2025/09058—Basic structures of guide wires
  • A61M2025/09075—Basic structures of guide wires having a core without a coil possibly combined with a sheath

Definitions

• the present invention relates generally to intravascular medical devices, and more particularly, to a medical guidewire having reinforcing fibers for use with magnetic resonance
• Such guidewires may be used in medical procedures for both diagnostic and
• Guidewires are used in a wide variety of medical procedures, most often in conjunction with one or more other medical devices, including catheters.
• catheters may be any of various types, such as angiography or angioplasty, but should in any event have a tubular lumen
• guidewires are often long, thin metal wires that generally taper from one diameter at a proximal end which remains outside the body of the patient, to a smaller diameter at the opposite distal end.
• vascular guidewires are often more than five feet long and have a maximum outer diameter of approximately 0.035 inches. The diameter of the core
• wire is generally ground down precisely in a series of alternating tapering portions and constant
• the guidewire distal tip is usually very flexible, both to avoid vascular trauma and so
• Guidewires are designed to resist this twisting force or torsion, so that as the guidewire
• the distal tip tends to rotate through about the same angle.
• a floppy spring is often affixed to the extreme distal tip of the guidewire for flexibility.
• the core wire tapers in steps to a distal portion
• the flexible spring at the guidewire distal tip is arranged to selectively control its brightness on an X-ray
• MRI magnetic resonance imaging
• MR magnetic resonance
• the present invention provides a guidewire compatible for use with magnetic resonance systems, made from a non-metallic material with a high specific electric impedance. Accordingly, this material will resist any electrical eddy currents in the guidewire from being generated by variations in the high-frequency field.
• An acceptable class of materials is glass, which are all electrical insulators. A guidewire having a major portion constructed of a glass material should therefore have the advantages of not disturbing the MR
• Figure 1 is a perspective view of a guidewire for use with magnetic resonance systems, arranged according to the present invention
• Figure 2 is a cross-sectional view of an intermediate portion of the guidewire of Figure 1;
• Figure 3 is a cross-sectional view of a proximal end portion of the guidewire of Figure
• Figure 4 is a perspective view of a guidewire for use with magnetic resonance
• Figures 5-7 are cross-sectional views of a portion of various guidewires arranged
• Figure 8 is a perspective view of a guidewire for use with magnetic resonance
• Figure 9 is a cross-sectional view of an intermediate portion of the guidewire of
• Figure 10 is a cross-sectional view of a proximal end portion of the guidewire of Figure 8.
• Figures 1 1-13 are side elevation views of distal portions of guidewires arranged
• FIG. 1 a perspective view of a stent according to a preferred embodiment of the present invention is shown generally at 1.
• the medical guidewire 1 is intended for use in intravascular medical procedures involving the use of magnetic resonance
• Guidewire 1 is constructed of a basic body 2 and a distal tip portion 3.
• the distal tip of guidewire 1 includes several markers 4
• the proximal portion of the basic body 2 is illustrated in Figure 3, and incorporates a
• the coated glass body 5 extends for substantially the length of the guidewire and is
• Markers 4 are visible under MR because they are susceptible to slightly distorting the uniformity of the magnetic resonance field, causing the magnetic field to become what is called “inhomogeneous.”
• the material of the markers 4 is selected specifically for this
• Dysprosium Oxide (Dy O 3 ).
• the glass body 5 is preferably made of a glass material having a high specific electric impedance, such as fiberglass, silica, or quartz.
• the coating 6 adds strength to the glass core 5, in that the coating allows the glass
• the coated glass core 5 may endure strain as high as 12%.
• the outer polymer sheath 7 may be constructed from any of a variety of materials, including nylon.
• An additional advantage of the design of the present invention is that the polymer sheath 7 can maintain the physical integrity of the guidewire, even if the glass core 5
• the polymer sheath 7 may be provided with a
• lubricious or hydrophilic coating as generally known in the art.
• the distal tip portion 3 of the guidewire 1 may be formed of a plastic, as shown in Figure 2, or of a metal as shown in Figures 8-13.
• the outer diameter of guidewire 1 preferably tapers to a smaller diameter toward the distal tip, as illustrated in Figures 8-13.
• the metal tip portion may be stainless steel or more preferably nickel titanium, or nitinol.
• the length of the metal distal tip segment is substantially shorter than the wavelength of the magnetic resonance field in which the guidewire is used.
• the glue 8 is preferably of a type that cures upon exposure to ultraviolet light. Accordingly, the polymer sheath 7 should be transparent, to allow the glue 8 to be exposed to the ultraviolet light after portions of the guidewire 1 are assembled as shown in Figures 1-3.
• An embodiment of the present invention is depicted in Figures 4-7, in which a
• guidewire 11 has a proximal portion 12 and a distal tip portion 13.
• Guidewire 11 has a
• fibers 18 may be embedded in a polymer matrix 19.
• a multiplicity of short reinforcing fibers 20 can be provided in a polymer matrix 21 ,
• the present invention includes the provision of reinforcing fibers in either the core of the guidewire or the plastic sheath surrounding the
• the reinforcing fibers may be of any suitable material, such as carbon, borium,
• the guidewire of the present invention may also be constructed of more than one glass
• core body all of which may be clad as a unit with a single protective coating.

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• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Hematology (AREA)
• Biophysics (AREA)
• Anesthesiology (AREA)
• Biomedical Technology (AREA)
• Heart & Thoracic Surgery (AREA)
• Pulmonology (AREA)
• Animal Behavior & Ethology (AREA)
• Engineering & Computer Science (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Physics & Mathematics (AREA)
• Pathology (AREA)
• Condensed Matter Physics & Semiconductors (AREA)
• General Physics & Mathematics (AREA)
• Media Introduction/Drainage Providing Device (AREA)
• Materials For Medical Uses (AREA)

Applications Claiming Priority (3)

Publications (2)

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Citations (8)

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• 1997
  • 1997-06-06 NL NL1006254A patent/NL1006254C2/nl not_active IP Right Cessation
• 1998
  • 1998-05-28 AU AU78017/98A patent/AU7801798A/en not_active Abandoned
  • 1998-05-28 WO PCT/US1998/010864 patent/WO1998055016A1/en not_active Application Discontinuation
  • 1998-05-28 EP EP98926103A patent/EP0989820A4/de not_active Withdrawn

Patent Citations (8)

Non-Patent Citations (1)

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