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Contrast agent comprising low density microspheres

  • US 6,773,696 B2
  • Filed: 10/25/2002
  • Issued: 08/10/2004
  • Est. Priority Date: 04/05/1991
  • Status: Expired due to Fees
First Claim
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1. A contrast agent comprising an aqueous suspension of low density microspheres, said low density microspheres having a void containing a gas or the vapor of a volatile liquid selected from the group consisting of aliphatic hydrocarbons, chlorofluorocarbons, tetraalkyl silanes and perfluorocarbons, wherein said void has a volume that comprises at least about 75% of the volume of the microsphere and wherein said contrast agent is suitable for administration to a patient either orally, rectally, or by injection.

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