Back to results
US 12,708,481 B2Granted
Magnetic markers for imaging and surgical guidance
AssigneeEndomagnetics Ltd
InventorsRobinson Udale, Gabriel Villar
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeEndomagnetics Ltd
InventorsRobinson Udale, Gabriel Villar
Estimating the term…
An implantable marker for imaging and surgical guidance by susceptometry comprising one or more pieces of a ferromagnetic material having a total length to diameter ratio of at least about 500, and a total volume of less than about 1×10−11 m3. The one or more pieces of ferromagnetic material may have a high initial relative permeability (μr,i)>about 1000. Also disclosed is a detection system for locating an implantable marker comprising such an implantable marker; at least one drive coil arranged to excite the marker with an alternating magnetic field, and at least one sense coil arranged to detect a signal received from the excited marker; a magnetic field generator arranged to drive an alternating magnetic field through the at least drive coil; and at least one detector arranged to receive the signal from the sense coil and detect one or more harmonics of the drive frequency in the received signal.
An implantable marker for imaging and surgical guidance, the marker comprising one or more pieces of a ferromagnetic material having a total length to diameter ratio of at least about 500, and a total volume of less than about 1×10−11 m3, wherein the one or more pieces of ferromagnetic material has a high initial relative permeability (μr,i)>about 1000, wherein the marker has a magnetic anisotropy ratio of less than about 7, preferably less than about 5.
An implantable marker for imaging and surgical guidance, the marker comprising one or more pieces of a ferromagnetic material having a total length to diameter ratio of at least 50, and a total volume of less than 1×10−10 m3;
An implantable marker for imaging and surgical guidance and being configured to produce a Magnetic Resonance Imaging (MRI) artefact of less than 2 cm diameter when imaged in an MRI scanner, the marker comprising one or more pieces of a ferromagnetic material having a total volume of less than about 1×10−10 m3 and a high initial relative permeability (μr,i)>about 1000, wherein the marker has a magnetic anisotropy ratio of less than about 7, preferably less than about 5.
Dependencies are inferred from the claim text.