| 摘要 |
<p>An instrument (10) for use in brachy-therapy comprises a concentric arrangement of inner and outer distensible, spherical chambers (30, 34) disposed near the proximal end of a catheter body (12) where one of the chambers (30, 34) is made to contain a radioactive material with the other chamber (30, 34) containing a radiation absorptive material, the apparatus (10) functioning to provide a more uniform absorbed dose profile in tissue surrounding a cavity created by the removal of a tumor. An alternative embodiment includes non-spherical inner and outer chambers whose respective walls are spaced equidistant over the entire surfaces thereof.</p> |
