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28Jul16
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CVX-300
®
Excimer Laser System Version 26 Operator’s Manual
English / English
Nominal Ocular Hazard Distance (NOHD)
The nominal ocular hazard distance (NOHD) is dened by the American National Standard
(ANSI
®
) Z136.1 – 2007 as the distance along the axis of the unobstructed beam from a laser,
ber end, or connector to the human eye beyond which the irradiance or radiant exposure is
not expected to exceed the applicable maximum permissible exposure (MPE) limits.
All laser energy produced by the CVX-300 Excimer Laser System, when operated in
accordance with this manual, is enclosed within the CVX-300, the Spectranetics Fiber Optic
Device or within the body except during the calibration of the ber optic device (refer to
the CVX-300 Excimer Laser System Operating Instructions and precautions in this manual).
During these short calibration periods, the energy output from the laser is not contained
and the operator should be aware of the NOHD from the tip of the ber. A 2.5mm ber optic
device emits the highest amount of energy during calibration.
The Fiber NOHD was calculated with the system in the Normal Operating Mode during
Calibration utilizing the following values;
Exposure time 20 seconds
Energy at tip of catheter 76.5mJ
Fiber Tip Diameter 2.5mm
Repetition Rate (calibration) 25 Hz
Numerical Aperture of the ber optic 0.22
Wavelength 308nM
Pulse Width 135nS
Repetitively Pulsed Yes
Using the ANSI
®
Z136.1 standard, the ber NOHD can be calculated as 1.35meters (53.1
inches) from the distal tip of the 2.5mm Reference Catheter device duringcalibration.
Always wear the appropriate laser safety glasses when using this equipment and follow all
safety precautions as outlined within this manual.
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