The surgical shadowless lamp is used to illuminate the surgical site, so as to observe the small and low contrast objects in different depths in the incision and body cavity. Because the head, hand and instrument of the operator may cause interference shadow on the operation site, the shadow free lamp should be designed to eliminate the shadow as much as possible and reduce the color distortion to a low level. In addition, the shadowless lamp must be able to work continuously for a long time without emitting excessive heat, because overheating will make the operator uncomfortable and dry the tissue in the surgical area.
I. Principle
In fact, shadowless lamp can not be "shadowless", it is just to reduce the shadow, so that the shadow is not obvious. Shadows are formed by light shining on objects. Shadows are different all over the earth. Carefully observe the shadow under the light of the electric lamp, and it will be found that the shadow is particularly dark in the middle and slightly shallow around. The dark part in the middle of the shadow is called the umbra, and the gray part around it is called the penumbra.
These phenomena are closely related to the straight line propagation of light. If you put a cylindrical tea cylinder on the table and light a candle beside it, the tea cylinder will cast a clear shadow. If two candles are lit beside the tea barrel, two overlapping and non overlapping shadows will be formed. The overlapped part of the two shadows is completely dark without any light, which is the true shadow; where there is only one candle beside the true shadow, it is the half light and half darkness.
If you light three or even four candles, the shadow part will gradually shrink, and there will be many layers in the shadow part. Under the light of electric lamp, an object can generate the shadow composed of the umbra and penumbra, which is also the truth. Obviously, the larger the area of the illuminated object, the smaller the shadow. If we light a circle of candles around the tea pot, the shadow will disappear completely and the half shadow will be invisible. According to the above principle, scientists have made a shadowless lamp for surgery.
It arranges the lamps with high luminous intensity into a circle on the lamp disc, and synthesizes a large area light source. In this way, the light can be radiated to the operating table from different angles, which not only ensures that the surgical field of vision has enough brightness, but also does not produce obvious shadow, so it is called shadowless lamp.
II, Composition
The surgical shadowless lamp is generally composed of a single or multiple lamp heads, which are fixed on the cantilever and can move vertically or circularly. The cantilever is usually connected to a fixed combiner and can rotate around it. The shadowless lamp is flexibly positioned by a sterile handle or a sterilized hoop (curved track), and has the function of automatic brake and stop to control its positioning, so as to maintain a suitable space above and around the operation site. The fixing device of shadowless lamp can be placed on the fixed point of ceiling or wall, or on the track of ceiling.
III. Types and evolution
The development of the surgical shadowless lamp has experienced the multi hole lamp, the single reflection shadowless lamp, the multi-level focusing shadowless lamp, the LED surgical shadowless lamp and so on.
Traditional porous shadowless lamp, mainly through multiple light sources to achieve shadowless effect.
At present, the more popular single reflection shadowless lamp in China is characterized by high illumination and focusing.
At present, porous multi focus surgical shadowless lamp is more popular in foreign countries, which is a high-end surgical shadowless lamp at present. In addition, the increasingly mature led surgical shadowless lamp gradually enters people's vision with its gorgeous shape, long service life, natural cold light effect and energy saving concept.
IV, Operation
For ceiling mounted shadowless lamps, one or more transformers shall be provided in the remote control box on the ceiling or wall to convert the input power voltage to the low voltage required by most lamps. Most shadowless lamps have dimming controls, and some products can also adjust the light field range to reduce the light around the surgical site (reflections and flashes from sheets, gauze or devices can make the eyes uncomfortable).
V. Routine maintenance
1, daily inspection
Bulb operating conditions (prx6000 and 8000).
Methods: put a piece of white paper in the working area, if there is arc shadow, change the corresponding light bulb. -Disinfection handle in place. Method: click twice during installation.
Cleaning: wipe the surface with weak alkaline solvent (soapy water); avoid using chlorine lotion (damaging metal) and alcohol lotion (damaging plastic and paint).
2, monthly inspection
It is mainly to check whether the standby power system (battery) is normal. Method: cut off the 220V power supply to see if the standby power supply is started.
3. Bulb life
The average service life is 1000 hours; for lamp holders, they are basically replaced once a year.
4, annual inspection
4 steps of maintenance (to be carried out by certified engineer):
(1) Tighten the power cable connector (at the input and output of the control box).
(2) Screw brush at each connection
(3) Adjust the rotation limit (for example, the 4000 type lamp head is around its lamp head arm)
(4) Brake of each joint of bulb working voltage (23v AC + DC): check the verticality of suspension pipe and the balance of suspension system, whether the fastening of screws at the connection of each part is normal, whether the brake is normal when each joint acts, the heat dissipation effect of rotation limit, the installation of disinfection handle of bulb status, and the diameter of light spot.
VI、 Five guarantees
1. Brightness assurance
The operating room surgeon must be able to accurately distinguish the contour, color and movement. Therefore, as a surgeon, it is necessary to approach the light intensity of sunlight quality. A light of 100000 lux determines the brightness of the sun at noon. In addition, in the surgical environment, most of the light is absorbed rather than reflected, which means that the surgical shadowless lamp must provide greater brightness.
The shadowless lamp can produce 150000lux brightness, and the brightness can be adjusted steplessly. Only with this brightness can surgeons have 50% of the visible light in the surgical area.
2. No heat guarantee
Light is bright and accompanied by heat. If there is heat during operation, it will bring great harm to surgeons and patients. So what we need in surgery is light without heat.
3. Pathogen free guarantee
One of the basic elements of surgery is to keep the number of pathogens in the process of surgery low, so we use excellent surgical shadowless lamp shape design, with appropriate placement (behind the surgeon), can effectively control the number of pathogens.
4. Color temperature guarantee
The color perception is determined by the color temperature of the light, for example: the color temperature of sunlight is 5600kelvin; the color temperature of 5600kelvin is white light. Therefore, experts suggest that the light color temperature in the operating room should be at least 4000 Kelvin; therefore, it can produce the same light as sunlight treatment. For human eyes, the color under the sun is clear, which makes the diagnosis more accurate and does not make the medical staff tired due to long-term work.
5. No shadow guarantee
Through the multi reflector, the shadowless lamp can meet the requirements of shadowless lighting. This kind of reflection is related to computer. It is formed by industrial stamping once, and the reflection rate is as high as 95%. His shape is very special: it is made up of many reflecting surfaces that reflect light and illuminate the whole operation area. Therefore, many light and shadow are superposed to form a homologous light column. The operation is carried out in this light column, that is, the light column which starts from 2000 PX under the light disk and reaches the operation area.
Shantou EASYWELL surgical shadowless lamp products include the OMNISTAR surgical shadowless lamp, the overall reflection surgical shadowless lamp, the second generation OMNISTAR surgical shadowless lamp and other products. The surgical shadowless lamp can be customized according to the situation of the enterprise to meet the needs of the enterprise. Welcome to choose products.