Implantable marker with a leadless signal transmitter compatible for use in magnetic resonance devices
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United States of America Patent
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Aug 17, 2010
Grant Date -
Jul 15, 2004
app pub date -
Dec 23, 2003
filing date -
Dec 30, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A leadless marker for localizing the position of a target within a patient. In one embodiment, the marker includes a casing, a resonating circuit, and a ferromagnetic element. The casing is configured to be positioned at a selected location relative to a target site in the patient; the casing, for example, can be configured to be permanently or semi-permanently implanted into the patient. The resonating circuit has an inductor within the casing comprising a plurality of windings of a conductor, but it does not have external electrical lead lines extending through the casing. The ferromagnetic element is at least partially within the inductor. The ferromagnetic element has a volume such that when the marker is in an imaging magnetic field having a field strength of 1.5 T and a gradient of 3 T/m, then the force exerted on the marker by the imaging magnetic field is not greater than gravitational force exerted on the marker.
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