Lumenis
®
Pulse
TM
50H / 100H Laser Systems
Chapter 4: Clinical Guide
UM-20006520DE, Rev. A
Page 22
Chapter 4: Clinical Guide
Lumenis recommends that physicians learn and gather additional
knowledge related to the Lumenis Pulse 50H or 100H system. For details
on courses available at Lumenis, contact your Lumenis representative.
Lumenis does not make recommendations regarding the practice of
medicine. Individual treatment should be based on clinical training,
clinical observation of laser-tissue interaction, and appropriate clinical
endpoints.
WARNING:
Unauthorized use of this system may expose the operator/patient to
potential electrical energy and laser radiation hazards.
The Ho:YAG wavelength has been shown to be a safe and effective tool
for the ablation, vaporization, incision, excision, and coagulation of a
variety of soft tissues. This has been demonstrated by both clinical and
preclinical studies. The 2100nm wavelength of the holmium laser system
is highly absorbed by water (absorption peak of water: 1940 nm). The
absorption of the laser energy by water produces an energy density that
heats the tissue to greater than 100°C thus vaporizing or ablating the
tissue without deep coagulation, allowing for precise incision (cutting)
and excision (dissection) when in direct contact with the tissue. When the
laser system is not in direct contact with the tissue, the produced heat can
dissipate, leading to coagulation of vessels to a depth of up to 3 mm.
The depth of the incision is determined by the amount of energy (in
Joules) applied. The rate at which the incision is made is dependent upon
the rate of energy pulses being delivered to the target tissue (in pulses per
second, or Hertz). Optimum incision of tissue is accomplished by
balancing the depth of the incision and the rate at which the incision is
being formed. The physician may control both the energy setting and the
repetition rate of the laser system, depending upon the specific type of soft
tissue, the desired tissue effect (excision, ablation, or coagulation), and the
speed at which this effect should be achieved.
The Ho:YAG wavelength provides effective hemostasis without
damaging the surrounding or non-target tissues. Decreasing the laser