Airflow through the auxiliary line of the laser fiber prevents ignition of intra-airway fire during endoscopic laser surgery.
OBJECTIVE
Ignition accidents during bronchoscopic laser irradiation have occasionally been reported, but the mechanisms responsible for the ignition accidents are not fully understood. We examined causative factors including ignition site, oxygen concentration, and role of airflow through the laser fiber.


METHODS
Porcine muscle tissue was placed in a bottle and irradiated by laser under various conditions. Also, a piece of porcine muscle was wedged in a main bronchus of the isolated porcine lungs and irradiated by laser in the same way.


RESULTS
Flashing occurred on the tissue exposed to the laser, and this flashing reached the ignition when the oxygen concentration was above 30%. Increasing airflow through the laser fiber prevented the ignition even at an oxygen concentration at 100%.


CONCLUSIONS
In laser irradiation, the tissue exposed to the laser can be the ignition site of fire. Increasing airflow through the laser fiber was an effective technique to prevent airway fire.
Takanashi
Shingo
S
The Second Department of Internal Medicine, School of Medicine, Hirosaki University, Hirosaki 036-8562, Japan. t-shingo@cc.hirosaki-u.ac.jp
Hasegawa
Yukihiro
Y
Ito
Akihiko
A
Sato
Masami
M
Kaji
Kunihide
K
Okumura
Ken
K
D000388:Air; D000818:Animals; D004867:Equipment Design; D004869:Equipment Safety / Q000379:methods; D005390:Fires / Q000517:prevention & control*; D053685:Laser Therapy / Q000009:adverse effects* / Q000295:instrumentation*; D010100:Oxygen; D013552:Swine
D010100:Oxygen