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Low-power (810 nm wavelength) Diode lasers, with gallium arsenide as the active medium. The lasers can be incorporated into a slit-lamp or indirect opthalmoscope by a flexible fiber-optic cable. They are used for coagulation of abnormal vascular tissue in the retina, and other photocoagulation procedures.
1. This is the delivered power for the different beams: 3 W for an argon blue-green beam, 1 W for an argon green beam, 1 W for a dye beam, 1.5 W for a krypton green beam, 1.5 W for a krypton yellow beam, 1 W for a krypton red beam, and 1 W for a Nd:YAG beam. The following lasers should have principal wavelengths of 530-540 nm: argon, dye, krypton, and frequency doubled Nd:YAG lasers. The requirements of the unit include: single and repeat delivery modes, exposure duration of 0.01 to 2 seconds, repeat time of 0.1 to 2 seconds, a spot diameter of 50 to 1,000 mm, a slit lamp, an intraocular probe, a hand piece, and an indirect ophthalmoscope. An Nd:YAG laser should use a Q-switched operating mode and a fundamental mode structure; it should have a single pulse of 0.3 to 10 mJ, pulse duration of 4 n/sec, and 1 to 3 pulses per burst. The spot size should be 10 Î¼m, and the cone angle â€“ 16Â°. A single pulse should be at 1-2 Hz, and a burst should be at 1 Hz.
2. Selected energy, shot selection, power output, and shot counter - should all be displayed and controlled by the unit.
3. The laser should have a joystick beam actuator.
4. A compatible slit lamp should be used with magnification up to 25Ã— and a working distance of 1,000 mm.
5. Each unit should have an automatic calibration system and the following accessories: contact lens, co-observation, a television with 35 mm adapter, a head restraint system, and a tonometer. An excimer laser should have a wavelength of 193 nm, 0-3 W of power output at tissue, 10 mJ per pulse, and an energy density of 150- 200 mJ/cm2, it should have both continuous and pulsed delivery modes, a beam diameter of 1 to 5 mm, a pulse repetition rate of 10 to 200 Hz, and a pulse duration of 10 to 15nsec.
6. Buyers should expect a unit with a high precision spot delivery system, a computer system, halogen gas cylinders, and 24 months of halogen source useful life.
7. A diode laser should have a power output on tissue of 1 W, both continuous and pulsed delivery modes, a pulse repetition rate 10 Hz, and pulse duration of 50 msec to continuous.
8. There are units requiring higher voltages and greater current capacity than those available from a standard outlet. If a unit needs an external water source, facilities should locate it above the first floor of an older building, and they may need a booster pump to provide adequate water pressure for cooling.
9. Facilities are encouraged to submit requests for proposal to several suppliers. They should discuss the important issue of prospective servicing.
10. Buyers should evaluate whether the laser is adaptable for other types of therapy for which they have a need.
Before you purchase your Ophthalmic Retinal Laser, we recommend you ask the seller the following questions: