Patent ID: 8277370

Claim:
A method for irradiating tissue at least in part surrounding a body cavity of a patient, comprising: a. providing a catheter device having an elongate shaft with a distal shaft portion, a treatment location at the distal shaft portion and a multilayered balloon having a first layer separate from, inside, and in contact with a second layer around an entire periphery of the first layer, and each of the first layer and the second layer being secured to the distal shaft portion and configured to surround the treatment location in an as formed configuration; b. providing a radiation source which is configured to be disposed in the treatment location of the treatment device; c. inserting the device into the patient until the treatment location on the distal shaft portion is disposed within the body cavity to be radiated; d. inflating the multilayered balloon on the distal shaft portion to expand the balloon at least 25% but less than 200% from the as formed condition to a turgid condition; and e. positioning the radiation source in the treatment location.