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Surgical lights
1. Surgical Lights
Compiled and Presented by:
Dr. Judith Justin M.Tech., Ph.D.,
Prof. & Head,
Department of Biomedical Instrumentation Engineering
Faculty of Engineering
Avinashilingam University
Coimbatore - 641 108
2. Introduction
• The surgical lights help the surgeon to visualize the insides of
the human body and do the repair.
• The light should penetrate into wound, illuminate it brightly
and uniformly and should not cast shadows of surgeon’s
hands onto the wound.
• Present day lights use power source lighting system with 4 to
8 lamps in a parabolic dome.
• The lamps in the dome are fixed symmetrically enabling the
focus from all lamps in the dome to be at one place.
• The fronts of the lamps have mirrors that reflect light to the
concave or parabolic reflector behind the lamps.
• The parabolic reflector reflects it to the point focussed.
3. Surgical Lights
• The colour temperature of the lamp is important as white
light gives better visualization as well as a color differentiation
of various parts of human body when it is opened.
• The most suitable lamp for such purpose is these halogen
lamp which provides a color temp of 4500◦ Kelvin. This
reduces strain to surgeons eyes. Even though the lamp gives
more heat, it is the brightness that is energy. It is safe to be
used near delicate tissue.
• The overhead surgical spot lights are mounted on a port that
is suspended from ceiling.
• The mount can be manipulated to bring it to the desired
position for the surgeon. Some of the mounts can rotate as
much as 360◦
• They can be tilted from 30◦ to 60◦ from its vertical axis.
• The height is collimated to limit 500 to 600 mm.
4. Surgical Lights
• The manipulation handle is sterilisable and hence the surgeon
himself can adjust the illumination according to his requirements.
These are mechanically done.
• Typically, two spot lights are attached to each part of the mount.
It is also possible to attach a third satellite lamp for increased
visibility or extension of the lighted field.
• In some OR’s closed circuit television cameras are mounted within
the framework of the surgical light, so that the operation
procedure can be viewed by students and other auxillary
personnel from outside.
• It can be recorded for further reference. The diagram of surgical
light is shown in figure.
6. Dome type ceiling fixed surgical
spot light• The mount is fixed by screws into the ceiling.
• To the mount, the main part is fixed which can rotate
360◦ on its own axis.
• To the part the arm stands approximately 0.67m (4.3 ft)
• A stem is attached to this extended arm at right angles.
• To this stem, the dome is fixed by an arm which may be 0.63m (1.4
feet).
• The stem can also rotate 360◦ on its axis which is vertical like a port.
• The arm with the dome can rotate around 210◦ on its axis which is
horizontal.
• The entire arm with the dome can travel from its horizontal axis to
about 45◦ downwards.
• The dome on its own horizontal axis can rotate 160◦ .
• All these adjustments done mechanically may allow excellent
maneuverability
