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Hydrated biodegradable superparamagnetic metal oxides

Patent 5219554 Issued on June 15, 1993. Estimated Expiration Date: Icon_subject March 31, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Patent References

Re27240

Re30360

2820740

2862920

3093545

3100202

3180741

3215572

3228881

3234209

More ...

Inventors

Application

No. 863360 filed on 03/31/1992

US Classes:

424/9.32, Particle containing a transition, actinide, or lanthanide metal (e.g., hollow or solid particle, granule, etc.)436/173NUCLEAR MAGNETIC RESONANCE, ELECTRON SPIN RESONANCE OR OTHER SPIN EFFECTS OR MASS SPECTROMETRY

Examiners

Primary: Rosenbaum, C. Fred
Assistant: Stright, Ronald K. Jr.

Attorney, Agent or Firm

Foreign Patent References

  • 0184899 EP. 06/13/1985
  • 0160552 EP. 11/13/1985
  • 0186616 EP. 07/13/1986
  • 0186947 EP. 07/13/1986
  • 3443251 DE. 05/13/1986
  • 155785 DD. 07/13/1982
  • 13098 JP. 09/13/2012
  • WO/80/0112 WO. 04/13/1986
  • 45026 PL. 10/13/1961
  • 748024 GB. 04/13/2012
  • 2138612 GB. 10/13/1984
  • 7800005 WO. 12/13/1978
  • 8303920 WO. 11/13/1983
  • 8402643 WO. 07/13/1984
  • 8502772 WO. 07/13/1985
  • 8504330 WO. 10/13/1985

International Class

A61K 049/00

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 superparamagnetic 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.

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