Encapsulated low-energy brachytherapy sources
US6099458A · kind A · utility
Inventor
Key dates
| Filing date | Feb 11, 1999 |
| Grant date | Aug 8, 2000 |
| Priority date | — |
| Expiry date | Feb 11, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N2005/1024
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An essentially cylindrical, metal-encapsulated, brachytherapy source including 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. The annulus is made of the same metal as said outer metal capsule. One or more low-profile welds are formed around the central circumference of the outer metal capsule for attaching the outer metal capsule to the annulus and for sealing the outer metal capsule. A plurality of substrate particles each having bound thereto a radioisotope are positioned in the 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.