Cynosure Cynergy, Техническое руководство

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42 of 112 850-1265-000, Rev. 4 Cynosure, Inc.
Circulation Systems
There are two, separate circulation systems on the Cynergy: the water and the dye solvent
circuits as diagrammed in
Figure 15 .
Water Circulation System
The water circulation system maintains the flashlamps (4x), YAG rod and laser heads at a
maximum temperature of 65 °C. There is no heater in this circuit. As a result, the operating
temperature can range anywhere between slightly above ambient and 65 °C.
The water pump circulates the deionized water through the laser head, heat exchanger and a flow
switch. A bypass loop contains a deionizer cartridge that helps maintain low electrical
conductivity of the coolant. Level switches located in the upper reservoir are used to provide
water level status information to the systems control electronics. The upper level switch indicates
when water must be added. The lower level switch, when activated, will not allow laser
operation until water is added.
NOTE: When adding water to laser use deionized or distilled
water only.
The solid-state temperature sensor measures the water temperature and provides temperature
information back to the microcontroller.
Dye Circulation System
When the laser is operating, the dye pump circulates the dye solution through a loop that starts at
the reservoir and passes through the laser head. When the laser fires, the flashlamp light excites
the dye in the laser head which results in laser light at a wavelength of 585nm ± 2%. In the same
process, the small dye volume in the laser head that was exposed to the flashlamp radiation is
chemically altered or degraded.
To compensate for dye degradation, the Cynergy laser uses a charcoal filter that has a selective
affinity for absorbing degraded by-products of dye. Thus, the filter “cleans” the solution of
degraded dye while supplying fresh dye to replace it. While doing this, it is important that it does
not scrub out all of the dye. The solution passes through a dye concentration sensor that
measures the concentration of the dye. If the concentration falls below the set value, a dye inject
pump and separate reservoir containing dye concentrate boosts the dye concentration to the
proper value.
The dye concentrate cannot be injected while the main, high-pressure pump is on, therefore,
when the system detects a low dye concentration in warm-up mode, the main dye pump may turn
off for a few seconds to allow the inject to enter the system.
The dye solvent is maintained at 40
o
C with a heater and heat exchanger system. It is necessary to
wait approximately 15 minutes for the solvent to reach 40
o
C if the laser is cold. Dye
concentration will change with dye solvent temperature, so it is important to keep the dye
temperature at a constant within 38 to 42
o
C at all times. The dye kit lasts for up to 100,000
pulses at which point the laser may be unable to achieve the higher fluences. The dye kit can be
easily replaced by the user. To assure that the proper power and wavelength are maintained, it is
important to use the appropriate filters and solvents.