end 5 is positioned adjacent the target tissue the distal end 8 of the optical fiber 2 carried within the casing 1 is then extended forward of the distal end 5 of the casing in close proximity or in contact with the target tissue then radiation is delivered continuously or sporadically as needed by optical fiber 2 to 34 cook 34 the target tissue thermally destroying the tissue and cauterizing any blood therein should bodily tissue accumulate on the optical fiber 2 the fiber may be withdrawn into the casing 1 and moved in and out thereby causing the distal end 8 of the fiber to come into frictional contact with the cleaning means 3 affixed to the interior wall 7 of the casing frictional contact between the fiber 2 and the cleaning means 3 removes the tissue attached to the distal end 8 of fiber the fiber 2 may then be extended forward of the distal end 5 of the casing 1 for continued removal of target tissue it is evident there has been provided in accordance with the present invention a unique cleaning catheter and an improved procedure for optical treatment and removal of selected tissues while this invention has been described in conjunction with a specific embodiment thereof various alternatives and modifications may be made without departing from.