LIGHT GENERATING DEVICE THAT SELF CENTERS WITHIN A LUMEN TO RENDER PHOTODYNAMIC THERAPY

摘要

A light generating device (1) for illuminating tissue adjacent to a body lumen while a distal end (5) of the device is centered in the lumen, to render photodynamic therapy. The device can either occlude or displace bodily fluid, both without the use of a balloon. In one embodiment, a flushing lumen (4B) has a port adjacent to an array of light sources(10) , to displace bodily fluid that might otherwise absorb light. Another embodiment employs a centering (45) member that moves between a first position and a second position. The centering member centers the device in the lumen and preferably is formed of a shape memory material. In yet another embodiment, the device includes an outer sheath and an inner member that are independently positionable, enabling the centering member to be selectively positionable. The centering member can be non porous, such that the centering member also occludes fluid flow.