Patent ID: 8398535

Claim:
A catheter assembly for delivering a radiation source into a body cavity, the catheter assembly comprising: a catheter shaft having a distal end and a proximal end, and an inflation conduit; an inflatable balloon coupled to the catheter shaft between the distal end and the proximal end, wherein the inflatable balloon defines an inner lumen that extends between the catheter shaft and the inflatable balloon, the inner lumen being in fluid communication with the inflation conduit; a dose delivery lumen extending along the catheter shaft between the proximal end and the distal end, the dose delivery lumen being configured to receive the radiation source and deliver the radiation source to a location within the catheter shaft that is surrounded by the inflatable balloon; and a radioabsorptive portion positioned in the inner lumen between the catheter shaft and the inflatable balloon, and surrounded by the inflatable balloon.