Patent ID: 6099458
Filing Date: 2000-08-08
Classification: A61N,G21G

Abstract:
An essentially cylindrical, metal-encapsulated, brachytherapy source comprising:an outer metal capsule, an annulus in a central interior position of said outer metal capsule, and a longitudinally extending heavy metal core in said annulus; said annulus being made of the same metal as said outer metal capsule;means including one or more low-profile welds around the central circumference of said outer metal capsule for attaching said outer metal capsule to said annulus and for sealing said outer metal capsule;a plurality of substrate particles each having bound thereto a radioisotope, said substrate particles being positioned in said outer metal capsule so that the radioisotope is distributed symmetrically within the source, equally divided between the two ends of the source, and positioned with a strong bias towards the extremes of the two ends of the source; andthe length of said metal core being determined by the shape, size and number of substrate particles at each end of the source.