الفهرس 
Types of lasersOnly 14 pages are availabe for public view
 |  | from | 143 |  |  |
| | | from | 143 | | |
Abstract
Laser is an acronym for II Light AmjJilification by
Stimulated Emission of Radiation II • The first laser
was built in 1960 by Dr. Maiman, using a. ruby rod as the
laser medium. Ruby has a special propert:y of generating
light of a single pure wave-length when stimulated.
The characteristics of laser beam ax’e monochromatic,
coherent and very powerful that make it suitable for use
in surgery.
Laser has advantages as precision, E~d when used to
cut tissues, the small vessels are sealEld along the line
of the incision, and the damage to the ELdjacent tissues
is much less than occurs with diathermy. In addition it
preserves sterility during surgery and minimises the postoperative
pain. And recently discovered that, it is speci··ficfor
haemato-porphyrins derivatives, so i~t is possible to
be used in diagnosis and treatment of ma’Ld gnancy ,
Laser have been used in the past decade either a light
knife to cut tissues, and the CO2laser is used for this
purpose , or as hemostatic agent by dirllcting the beam
down a flexible endoscope to seal a blellding vessel in the
bed of an ulcer, and in this case either the Neodymium
yttrium - aluminium garnet laser or argon laser are used.
Fibl~roptic endoscopy has achieved mfLjor changes in the
diagnosis and treatment of upper gastroi.ntestinal haemorrhage
• ’Laser photocoagulation has been one of the recent
endoscopic approachs in this field, it is very useful in
bleeding peptic I1lcers specially in high risk group how
can not withstand surgery.
Also there are many uses of laser in surgery as in
management of lung cancer in the field I)fthoracic surgery,
and also used in urology, neurosurgery, vascular surgery
and in cutaneous and plastic surgery.
Laser system are expensive and i~nobile, these represnts
the basic obstacles in the way of their application ,
and if these difficulties are solved, l:aser therapy beoome
widely used •
.As the future of laser application in Egypt, studies
should be directed to manage bleeding oesophageal varices
and to apply laser in other fields.