THEORY OF OPERATION
4-4
Versapulse Select Service Manual
0621-499-01 01/94
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Folding Mirrors - 2 folding mirrors direct the beam output from the servo mirror towards the
fiber focusing lens.
First Wedge Optic - The wedge optic front and back surfaces each reflect a small portion
(≈.2%) of the YAG energy back towards an imaging mirror. The imaging mirror is positioned
to direct these reflections upon two pyrodetectors mounted on the Single Solenoid PCB, one
sample to each pyro. The pyro circuitry translates the energy sample into a voltage
proportional to the energy of the Ho:YAG pulse.
Low Energy Attenuator - The LE attenuator is inserted into the beam path to allow the
Versapulse Select to deliver a lower range of pulse energies. This function is currently used
on dual wavelength lasers if holmium energy is less than .5 j or Neodymium power less than
25 W is selected.
Second Wedge Optic - A second wedge optic is required to check the power after the LP
attenuator. Although two samples are reflected off the wedge, only one is used. An imaging
mirror directs the sample towards a pyrodetector mounted on the Dual Solenoid PCB. The
pyro circuitry translates the energy sample into a voltage proportional to the energy of the
Ho:YAG pulse. The low power attenuator function is not implemented by current software.
Service Attenuator - The service attenuator is inserted into the beam path to attenuate the
beam before it enters the fiber focus assembly. This prevents damage to the attached fiber
alignment detector as the system is fired to do the fiber focus alignment. It is operated by a
switch inside the unit accessible to the service engineer. The system will not operate in user
mode if the service attenuator is left in the beam path.
Safety Shutter - Blocks the treatment beam path when de-energized.
Aiming Beam Diode, Folding Mirror, and Combiner Optic - Aiming beam is provided by a
650 nm diode laser. The user can select high, low, or medium intensity; or turn the aiming
beam off. The folding mirror and combiner are adjusted to place the aiming beam coaxial
with treatment beam.
Fiber Focus Lens - Focuses the beam into the end of the fiber.
Blast Shield - Protects the fiber focus lens from debris ejected from the proximal end of the
fiber in the event of a fiber failure.
Delivery Fiber - A number of delivery fibers are available for use with the Versapulse Select,
each providing features suiting it to certain applications, such as orthopedic, endoscope,
laparoscope, laser assisted disk surgery, etc.. The fibers are designed for a single use and are
not repairable.
Software (4.7) - Separate sets of instructions are provided for the main processor and safety
processor, i.e., the two processors do not execute the same instruction sequence - the main processor
is primarily involved with operating the system in response to user inputs, while the safety processor
is exclusively involved with monitoring for and responding to any potential unsafe condition. The
two software programs require inputs from the other, i.e., they are designed to run concurrently, and
communicate back and forth through a shared memory. The software instructions are stored in
EPROM's on the Controller PCB. Software upgrades can be accomplished by replacing the software
EPROMs. Different software versions are required for different Versapulse Select models.
12/95
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