A - Human Necessities – 61 – K
Patent
A - Human Necessities
61
K
167/127, 167/46
A61K 49/00 (2006.01) A61K 33/26 (2006.01) A61K 49/18 (2006.01) C08G 18/18 (2006.01) C08G 18/20 (2006.01) C08G 18/24 (2006.01) C08G 18/26 (2006.01) C08J 9/14 (2006.01) G01R 33/28 (2006.01)
Patent
CA 1301063
ABSTRACT This invention relates to materials exhibiting certain magnetic and biological properties which make them uniquely suitable for use as magnetic resonance imaging (MRI) agents to enhance MR images of animal organs and tissues. More particularly, the invention relates to the in vivo use of biologically degradable and metabolizable superparamagnetic metal oxides as MR contrast agents. Depending on their preparation, these metal oxides are in the form of superpara- magnetic particle dispersoids or superparamagnetic fluids where the suspending medium is a physiologically-acceptable carrier, and may be uncoated or surrounded by a polymeric coating to which biological molecules can be attached. These materials are administered to animals, including humans, by a variety of routes and the metal oxides therein collect in specific target organs to be imaged; in the case of coated particles, the biological molecules can be chosen to target specific organs or tissues. The biodistribution of the metal oxides in target organs or tissues results in a more detailed image of such organs or tissues because the metal oxides, due to their superparamagnetic properties, exert profound effects on the hydrogen nuclei responsible for the MR image. In addition, the dispersoids and fluids are quite stable and, in the case of the fluids, can even be subjected to autoclaving without impairing their utility. Furthermore, the materials are biodegradable and, in the case of iron oxide compounds, can eventually be incorporated into the subject's hemoglobin, making them useful in treating anemia. Thus, the materials are well-suited for in vivo use.
541079
Groman Ernest V.
Josephson Lee
Lewis Jerome M.
Advanced Magnetics Incorporated
Osler Hoskin & Harcourt Llp
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