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Microcapsules for site-specific delivery

  • US 5,993,374 A
  • Filed: 06/17/1997
  • Issued: 11/30/1999
  • Est. Priority Date: 06/17/1997
  • Status: Expired due to Term
First Claim
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1. A two-component microcapsule for therapeutic or diagnostic use comprising:

  • a first part comprising a transient radioactive central core; and

    a second part comprising a transient single-piece outer shell surrounding the central core;

    wherein the microcapsule has a diameter within the range of from about 5 microns to about 50 microns, and the central core and the outer shell break down in an aqueous environment into biologically compatible break down products.

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