THEORY OF OPERATION
4-1
Versapulse Select Service Manual
0621-499-01 01/94
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4.0 THEORY OF OPERATION
4.1 INTRODUCTION
4.1.1 Operational Overview
The Versapulse Select family of Holmium YAG laser systems is designed for use in surgical applications. The
treatment laser delivers pulsed 2100 nm wavelength energy (invisible) through a user attached disposable
delivery fiber in response to the depression of an attached footswitch. The pulses continue until the
footswitch is released. A diode laser provides a visible (red, 650 nm) aiming beam. An equipment description,
specifications and detailed user operating instructions are included in the Versapulse Select Operator
Manual.
A key is required to turn the system on. At turn-on the system undergoes a series of self tests (approximately
30 seconds), then, if no malfunctions are detected during the self tests, goes to its STANDBY condition. If the
self testing process detects any malfunction, an error message will be displayed and the system will not be
enabled until the fault condition clears.
Once the unit is in STANDBY the user selects the desired operating parameters through a touch screen
display, or on a wired remote control (available as an option). Controls include aiming beam intensity, pulse
energy and pulse rate. Selections are displayed on the screen.
Aiming beam intensity can be turned off or adjusted for high, low or medium.
Pulse energy and pulse rate combine to determine the average power.
(ENERGY/PULSE)*(PULSES/SECOND) = Average Power in Watts
Pulse energy is adjustable, in increments, from .5 to 2.8 Joules. Pulse rate is adjustable, in increments, from 5
to 40 Hz. The combination of pulse energy and pulse rate define an operating point. Not all combinations of
pulse energy and pulse rate are valid, and the operating points available vary with the different Versapulse
Select models available. Consult the Operator Manual for detailed information on the operating points for a
particular model.
A total energy display with a clear function allows the user to keep track of the total energy used from the last
time the display was cleared.
A delivery system fiber is attached to a fiber port on the front of the system console. The delivery fiber is a
consumable item. It comes in a number of styles to meet the requirements of various applications (angled,
etc.). The system will not fire without a delivery fiber attached.
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