Abstract
ABSTRACT In laser surgery power densities of 1 O W/cm2 are used for tissue vaporisation or 1 6 W/cm2 and more for photoablation. These densities are harmful to endotracheal tubes or other deviceswhich are used in a close distance to the laser beam. The laser resistance of endotracheal tubes was measured under the exposure of various lasers in the UV, the visible and the JR wavelength range. The laser induced temperatures of the tube materials were measured by anJR camera. Jt is discussed which physical processes of light material interaction cause heat andhow this heat deposition is compensated by cooling processes to keep the temperature rise inan acceptable range. The experimental observation can be well described by the physicalproperties ofthe materials and their composition. Key words: Laser Safety, Laser Surgery, Endotracheal Tubes, Protection Mechanism 1 INTRODUCTION Laser safety covers not only the risk of direct laser tissue interaction but also indirect riskswhich are induced when the power of the laser beam ignites burnable materials. Especially thissecond point is important in the field of laser surgery when tubes are placed in natural orartifical openings ofthe human body.Jn the upper aerodigestive tract tumor resection is nowadays successfully performed with CO2laser beams with powers of 20 W and more. The beam is delivered by an adjustable mirror
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