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Gas filled liposomes and their use as ultrasonic contrast agents

  • US 5,305,757 A
  • Filed: 02/12/1993
  • Issued: 04/26/1994
  • Est. Priority Date: 12/22/1989
  • Status: Expired due to Term
First Claim
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1. A method for preparing contrast agents for ultrasonic imaging comprising the following steps:

  • (i) placing liposomes under negative pressure;

    (ii) incubating said liposomes under said negative pressure for a time sufficient to remove substantially all liquid from said liposomes; and

    (iii) instilling gas into said liposomes until ambient pressures are achieved.

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