The doctor said that the shadowless lamp is a common medical device on the operating table, mainly for the best observation of different depths in the patient's incision and body cavity; the picture shows the situation.

(picture taken from freepik)

[Health Channel/Comprehensive Report] Everyone must have had an experience. When repairing something, no matter whether you use a desk lamp or a flashlight, you will find that the shadow of your hand always distorts the image you see and hinders the next action.

Emergency physician Weng Zihua said that if the light in the operating room makes the shadow of the hand block his vision, then the suture of the wound may cause serious problems. Therefore, to solve the problem of shadows, physics can be divided into adding The light source and the use of shadowless lamps are two aspects.

Weng Zihua posted on the Facebook page "Emergency Conan Dr. Weng Zihua" that the shadowless lamp is a common medical device on the operating table. It is mainly used to best observe the patient's incision and different depths in the body cavity. It can be said that we can start from two aspects:

Please read on...

●

In addition to directly irradiating the object, the light source can also shine on the object through the reflection of the wall, so if you increase the background light source, you can also make the shadow fade. If you look carefully at the design of the emergency room, basically Both are fairly bright, which reduces shadows.

●Use a shadowless lamp:

If you carefully observe the place where the emergency doctor performs the operation, there is usually a large lamp hanging on it. The light source, as far as possible, allows emergency physicians to clearly see the tissue in the field of view when performing surgery, which is conducive to wound treatment.

Regarding the principle of the shadowless lamp, Weng Zihua explained that the shadow is an optical phenomenon, which is a darker area formed because objects block the transmission of light and cannot pass through opaque objects.

The shadow is divided into the

and the

. The dark area formed by the space behind the backlit surface of the object is not illuminated by light at all is called the umbra area; the area in another part of the space area is illuminated by part of the light and distributed around the umbra area. It is called the penumbra area.

In the shadow area, when more light sources are added, the umbra area becomes smaller, and the brightness in the natural field of view will be much clearer.

For example, Weng Zihua, if you can experiment at home, turn off all the lights in the room and light the candle at this time. When only one candle is lit, you will find that the shadow behind you is dark and big, but as you gradually light it As the number of "candles from different angles" increases, you will find that the shadow behind you is getting weaker and weaker. This is the principle of the emergency shadowless lamp.

Weng Zihua said that in daily life, the same principle can also be used to solve this problem. Turn on all the lights in the room to increase the background light source; take more flashlights or desk lamps to illuminate from different angles to reduce the area of ​​​​the umbra , so that next time you will be less likely to encounter unseen dilemmas.

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keywords

• Emergency room

• operating table

• light

• Shadowless lamp

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