Patent ID: 7261730

Claim:
An apparatus for delivering radiation, comprising: (a) a flexible shaft, the flexible shaft having a distal end and a proximal end, at least two internal channels extending from the distal end to a location closer to the proximal end and in fluid communication with each other at a location proximate to the distal end, at least one of the at least two channels adapted for coupling with a source of a coolant; (b) a plurality of radiation emitting devices disposed within at least one of the channels, at least a portion of the shaft proximate to the radiation emitting devices being transmissive of at least a portion of radiation capable of being emitted by the plurality of radiation emitting devices; (c) a coolant; and (d) a coating on the surface of at least one of the plurality of radiation emitting devices, the coating substantially providing refractive index matching between the at least one of the plurality of radiation emitting diodes and the coolant.