The laser diode devices of the "Crystal 2000" family with a standard optical connector of the SMA-905 type are unique instruments. They can produce laser radiation at different wavelengths and powers at the end of the lightguide. The "Crystal 2000" devices reveal high reliability because they incorporate American laser diodes.

To realize different operation modes of photodynamic therapy, one may employ the "Crystal 2000" devices operating at wavelengths of 635, 662, and 675 nm and having maximum powers of 0.5, 1, 1.5, 2, 2.5, 3, and 4 W at the end of the lightguide. A complete set of each device contains three standard lightguides and two pieces of safety goggles.

Performance Specification

Radiation mode	Continuous-wave (CW)
Radiation power adjustment	From 0 to maximum at an increment of 100 mW
Radiation time adjustment	From 1 sec to 60 min at an increment of 1 sec
Power supply	220 W, 50 Hz 110 W, 60 Hz
Power consumption	Not more than 150 VA
Dimensions	400 x 300 x 260 (mm)
Mass	Not more than 4 kg

Model Range
Data in brackets show the radiation wavelength (nm) and CW radiation maximum power (W)

Fiber-Optics Instruments
     A series of lightguide instruments enables one to deliver radiation to an operation site.

1. Diffuse-Type Fiber-Optics Lightguides(the diffuse part is 5, 10, and 20 mm in length). These allow one to conduct interstitial and endoscopic operations.
   
   
2. Microlens-Incorporating Lightguides.These lightguides are employed for radiation defocusing.
   

Fiber-optics lightguides can be used to perform endoscopic or abdominal operations together with a balloon catheter. The terminal part of the balloon catheter is filled with pressurized liquid. The latter makes it possible both to enlarge the exposure site and to provide a more uniform scattering. The exposure site enlargement is of importance for treating the esophagus (1), bladder (2), uterine cavity (3), and some other organs.

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A complete set of instruments for endocavitary operations includes a connecting cable. It can be connected to replaceable optical attachments having different scattering indicatrices. The attachments may include sterile disposable diffusers in individual packages. The diffuse part of such attachments may range between 40 and 90 mm in length.

     Photosensitizers:
     If needed, domestic photosensitizers can be supplied. They reveal strong absorption at wavelengths of 635, 662, and 675 nm.

1. Photohem - is analogous to the American photosensitizerPhotofrin II (l=635 nm), which is the most widespread photosensitizer all over the world.
2. Radachlorinand Radagel - are the latest photosensitizers of the third generation of the chlorine family (l=662 nm). They are remarkable for both their high accumulation selectivity in the tumor and rapid elimination rate. This potentiates their antineoplastic effect and makes the treatment term as short as 2 to 3 hours.
3. Photosense - is a photosensitizer of the second generation (l=675 nm) with a longer absorption wavelength. This provides a greater radiation penetration in biological tissues, which allows one to destroy large and deep tumors.

Training Courses
     Physicians can undergo training courses on photodynamic therapy of cancer, persistent wounds, and trophic ulcers.