Hazard zones and eye protection requirements for a frosted surgical probe used with an Nd:YAG laser.
Rockwell-RJ Jr.; Moss-CE
Lasers Surg Med 1989 Jan/Feb; 9(1):45-49
A hazard analysis was conducted concerning the magnitude of optical density required in laser eye protection and the extent of hazardous beams emitted under worst case surgical conditions for a frosted surgical probe used with 30 watt Nd/YAG laser. The analysis was based on the nominal hazard zone (NHZ) criteria as defined in the ANSIZ-136.1 standard. Radiometric measurements made for the purpose of establishing the NHZ for a frosted style surgical probe were summarized. The data obtained will be used to establish eye protection specifications and other safety factors required during use. Findings indicated that a significant portion of the laser beam was diffusely scattered into a uniform spherical volume. The beam power measured in the forward direction was strongly dependent on the distance between the sapphire probe and the detector surface. The NHZ of the 30 watt Nd/YAG laser with a frosted surgical sapphire probe extended approximately 29 centimeters in the sideward and backward direction. The authors conclude that the NHZ envelope should be considered to be a spherical volume of 1.3 meters in diameter with its origin at the sapphire probe. These results and conclusions should not be extrapolated to other probe designs since each probe configuration may have direct and scattered beam fields inherently related to the probe design itself.
NIOSH-Author; Health-care-personnel; Operating-rooms; Eye-protective-equipment; Laser-radiation; Personal-protective-equipment; Radiation-exposure;
Author Keywords: surgery; hazard analysis
Lasers in Surgery and Medicine