Surgical shadowless lamps are used to illuminate the surgical site for optimal viewing of small, low-contrast objects at various depths in incisions and body cavities. Since the operator’s head, hands and instruments may cause disturbing shadows to the surgical site, the surgical shadowless lamp should be designed to eliminate shadows as much as possible and minimize color distortion. In addition, the shadowless lamp must be able to work continuously for a long time without emitting excessive heat, which can cause discomfort to the operator and dry the tissue in the surgical field.
The Chinese name is shadowless lamp and the foreign name is shadowless lamp. The surgical shadowless lamp is used to illuminate the surgical site. It is generally composed of a single or multiple lamp heads. The characteristics are to reduce the umbra and make the umbra less obvious.
The shadowless lamp is not actually “shadowless”, it just reduces the umbra, making the umbra less obvious. Shadows are formed when light hits an object. Shadows are different everywhere on earth. Carefully observe the shadow under the electric light, and you will find that the shadow is particularly dark in the middle and slightly lighter around. The dark part in the middle of the shadow is called the umbra, and the dark part around it is called the penumbra. The generation of these phenomena is closely related to the linear propagation of light. If a cylindrical tea container is placed on the table and a candle is lit next to it, the tea container will cast a clear shadow. If two candles are lit next to the tea container, two shadows that overlap but do not overlap will be formed. The overlapping part of the two shadows has no light at all, and is completely black, which is the umbra; the place where only a candle can shine next to the umbra is the half-light and half-dark penumbra. If three or even four candles are lit, the umbra will gradually shrink and the penumbra will appear many layers. It is also true that objects can generate shadows composed of umbra and penumbra under electric light. Obviously, the denser the light source of the illuminating object surrounds the illuminated object, the smaller the umbra. If we light a circle of candles around the aforementioned tea container, the umbra disappears completely and the penumbra fades out of sight. Scientists have made a shadowless lamp for surgery based on the above principles. It arranges the lamps with high luminous intensity into a circle on the lamp panel to synthesize a large-area light source. In this way, light can be irradiated on the operating table from different angles, which not only ensures sufficient brightness of the surgical field of view, but also does not produce obvious umbra, so it is called a shadowless lamp.
Composition
Surgical shadowless lamps are generally composed of single or multiple lamp heads, which are fixed on the cantilever and can move vertically or cyclically. The cantilever is usually connected to a fixed coupler and can rotate around it. The shadowless lamp adopts a sterilizable handle or a sterilized hoop (curved rail) for flexible positioning, and has automatic braking and stopping functions to control its positioning, maintaining a suitable space above and around the surgical site. Fixtures for shadowless lamps can be placed on fixed points on the ceiling or wall, or on the ceiling rails.
Types
The development of surgical shadowless lamp has experienced by porous shadowless lamp, single reflection shadowless lamp, porous focusing shadowless lamp, LED surgical shadowless lamp and so on.
The picture on the right is a traditional porous shadowless lamp, which mainly achieves shadowless effect through multiple light sources. The picture on the left is the more popular single-reflection shadowless lamp in China, which is characterized by high illumination and focusability.
The more popular abroad is the multi-hole focusing surgical shadowless lamp, which is a higher-end surgical shadowless lamp. In addition, the increasingly mature LED surgical shadowless lamp has gradually entered people with its gorgeous shape, long service life, natural cold light effect and energy-saving concept. in the field of vision.
Function
For shadowless lamps installed on the ceiling, one or more transformers should be set in the remote control box on the ceiling or wall to convert the input power voltage into the low voltage required by most bulbs. Most shadowless lights have a dimming controller, and some products also adjust the light field range to reduce lighting around the surgical site (reflections and flashes from sheets, gauze, or instruments can be uncomfortable to the eyes).
Post time: May-29-2022