Radioactive therapeutic seeds
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United States of America Patent
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Dec 23, 2003
Grant Date -
Apr 10, 2003
app pub date -
Oct 28, 2002
filing date -
May 18, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Radioactive therapeutic seeds include one or more carrier structures each carrying a radioactive isotope, a ceramic spacer or collar member, a metal ring about the ceramic member, and a capsule formed from two tubular parts, each part including a closed end, an open end, and an interior. The open ends of the capsule abut the metal ring and are preferably welded thereto to form a generally uniform capsule wall such that the carrier structure(s) and ceramic member are contained in the interior of the capsule. The ceramic spacer preferably is hollow and a radiopaque or MRI-visible marker extends therethrough. Each of the embodiments is designed to provide a substantially isotropic distribution of radiation.
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