HK1104345B - Operating lamp - Google Patents

Description

Operating lamp

Technical Field

The invention relates to an operating lamp comprising at least one white and several colored lighting means for illuminating an operating area and a controller for controlling the lighting means.

Background

Such surgical lamps are used in operating rooms and are therefore well known.

It is desirable to control the luminous flux of the operating lamp with respect to the color temperature, intensity and distribution on the light radiating surface. Such control can only be achieved with difficulty, if at all, by operating lamps comprising conventional lighting means, such as halogen or gas discharge lamps. When using a separate lighting device, the color temperature of the halogen or gas discharge lighting device cannot be specifically adjusted during surgery, but can only be changed with filtering techniques. When several expensive lighting devices are used, the color temperature can be varied within a certain range. The brightness can be adjusted by the aperture without changing the color temperature. The color temperature is also changed by using the change in brightness with the dimming. The distribution can only be coarsely adjusted by aperture techniques or using several expensive lighting devices.

Disclosure of Invention

It is the primary object of the present invention to improve the triggering of the lighting device to adjust the color temperature and intensity (brightness) of the operating lamp.

In order to achieve the above object, the present invention proposes an operating lamp (1) comprising: at least one white and several colored lighting devices for illuminating a surgical site, and a controller for the lighting devices, means being provided for storing energy values for the lighting devices, and the controller being designed to drive individual groups of several lighting devices, characterized in that the criteria of the grouping are the colors of the lighting devices.

The color temperature and intensity (brightness) of the surgical lamp should be adjustable. For this purpose, light emitting diodes of different colors (e.g. cool white, warm white, cyan, blue) are for example used as lighting devices which are then driven by an adjustable energy value (i.e. e.g. the current and/or voltage of a set of lighting devices).

In order to normalize the lighting parameters of the lighting devices of a single group, energy values of different lighting parameters are stored, assigned to each group.

The color temperature of the operating light, the light intensity of the operating light or the light intensity distribution across the light-emitting area are preferably taken into account as target values for the lighting parameters. Multiple sets of lighting devices can be driven, controlled and calibrated with nominal values.

An easily controllable current intensity may more preferably be used as the energy value or the light flux value that can be controlled by a nominal value. The current value may control the current intensity or a pulse sequence for pulse width modulation to optimize the driving.

The lighting device is advantageously combined in one or more modules or combinations. This provides the possibility of designing different operating lamps.

Each module or each combination may be assigned to a memory device (EPROM). In addition, transmission of data to the operating light central controller may be provided. This advantageously simplifies module swapping for repair work. By storing data for each module, replacement modules with the same lighting performance can be installed. Even after the central controller is replaced, it is ensured that the lamp is operated with its calibration values.

Drawings

The schematic drawings show preferred embodiments of the invention explained with the aid of the drawings.

FIG. 1 shows the construction of a surgical light module in greater detail;

FIG. 2 shows the surgical lamp;

fig. 3 shows the operating region of the operating device for the operating lamp.

Detailed Description

All the individual light modules which can be incorporated in an operating lamp, for example the light module 6a shown in fig. 1, each consist of one cover 9 together with mechanical and/or electrical or electronic connecting elements or connectors for connecting adjacent light modules. The shape of the light modules is designed such that they can be arranged on a typical spherical surface with a radius of 1000mm without gaps. For this reason, the optical module has a hexagonal shape. When they are assembled, a honeycomb or facet (facette) structure is formed. The surface of the light module facing the operating position does not necessarily need to be flat but may be slightly concave to better reproduce the curvature of the sphere. The optical axis of the optical module 6a generally faces the focal point of the sphere.

Different light area shapes can be created by arranging the light modules next to each other with varying angles of incidence. Intermediate elements may also be used for this connection. Some light emitting diodes, of the order of 10 to 50, are arranged in a uniform distribution in the light module 6a, of which only 3 are shown in fig. 1, with reference numerals 10a to 10 c. The arrangement of the shadows is optimized by the light emitted by the plane. For this purpose, each light-emitting diode emitting nearly point-like light is positioned in a suitable optical element, such as a lens 11a to 11c (indicated by dashed lines, for example, light-emitting diode beams 12a to 12 c). The shape of the lens elements 11a to 11c is designed such that they better fill the light module 6a up to its edge. The lens elements 11a to 11c may additionally have scattering structures to provide more uniformity to the light region. The lower face 5 of the light module may be covered by a transparent disc.

The individual light modules 6a together form a light source with a color temperature of approximately 4500K and a color reproduction rate of Ra > 93 to reproduce, for example, the natural color of the tissue on which the surgery is to be performed. Thus, in addition to light emitting diode 10a producing white light, light emitting diode 10b is used to produce colored light having a first color, and light emitting diode 10c produces colored light having a second color. Spectral dropout caused by using only white light emitting diodes is partially compensated by adding colored light portions such as cyan and blue. In addition, a mixture of specific colors may be produced to improve the field of view of the operating physician. When a white light led has a constant brightness, the color temperature and the color rendering of the mixed light produced by an integrated module (overall modules) consisting of all individual light modules (integrated light sources) can be variably adjusted by dedicated continuous dimming (dimming) of the colored led intensities. The luminous flux intensity of the light emitting diodes 10a to 10c can be continuously changed. It may also be desirable to keep the total illumination intensity constant by matching the intensity control of all the leds.

The light emitting diodes 10a to 10c are connected via current lines 13a to 13c to one printed board 14 arranged within the light module 6a and to a central controller 15 which electrically dims the light flux of the light emitting diodes (electrical dimming) and is operable by means of operating elements 16.

The variably controllable operating lamp (fig. 2) consists of, for example, three or five individual light modules, each having approximately 35 differently colored light emitting diodes as illumination means. Each individual light emitting diode, including its optical system, is capable of illuminating the entire illumination area, and thus each individual light module is also possible. The different light intensities and color temperatures of the surgical light can be adjusted by activating the light emitting diodes in different ways. It is thus decisive that the individual light modules achieve the same optical effect in the illumination region with regard to brightness and color temperature. According to the invention, the light emitting diodes are combined into several groups, each of which can be driven individually. The criteria for the grouping arrangement are the color of the light emitting diodes and the number of light emitting diodes when the maximum current carrying capacity of the controller has been exceeded. Individual groups may be combined in modules or other combinations. These groups are then driven by the central controller 16, where the user can select the desired color temperature, light intensity and light emission distribution.

Each module or each combination of individual led groups is measured with respect to brightness and color temperature and calibrated to the respective nominal values. This also compensates for the effect of the light emitting diode changing its color temperature by reducing the current (linear current control) when dimming. Furthermore, leds typically have large yield tolerances with respect to illumination color temperature and light intensity. Thus, a single set of energy values must be measured for each module or combination to obtain the desired rating. These energy values, which are derived when the nominal value is reached, i.e. for reaching the nominal value, a certain energy value is required for each group of lighting devices, are stored for the modules or combinations of the individual groups. The energy value indicates the energy at which each individual group must be driven to reach the set nominal value. This energy value may be a current value (linear current control) or a pulse sequence for pulse width adjustment to supply current to the light emitting diode. The combination of settings for the individual groups yields the settings required for the nominal values of color temperature, intensity and distribution. It is also possible to determine the color temperature and intensity of the emitted light during operation and the control of the parameters therewith, without storing energy.

The energy value may be stored in a central controller. However, these values are advantageously spatially or functionally assigned to the respective groups of modules or combinations. This can be realized, for example, on a printed board 14 in the module, on which plug-in connectors are arranged to distribute the supply of power. A storage means, such as an EEPROM (electrically erasable programmable read only memory) or a flash memory, may be arranged to store the values of the modules or combinations of the set. When the surgical lamp is turned on, these values are transmitted to the central controller and the module or combination is operated with its calibrated values.

In addition, a temperature sensor may be disposed on or attached to the printed board in the module that measures the temperature within the enclosure and reduces the light intensity if the temperature is above an acceptable temperature, thereby reducing the temperature.

The basic setting of the color temperature is preset at 4500K, which is automatically generated when the operating lamp is turned on.

The operating element 16 of fig. 3 has a movable key/rotary switch 17 that can be depressed and rotated to sterilize and pulse the surgical light controller. When the switch 17 is pressed, the different operating states of the operat-ing lamp are successively changed by the following functions:

on/off (complete off or standby state)

-light intensity (brightness)

Color temperature

Lighting conditions (selection of the intensity distribution of the emitted light)

-the options: camera drive (location, zoom)

The progressive rotation determined by the switch 17 is facilitated by the locking position. This changes the operating parameters within the operating state, which can be displayed on the operating device 16. The following parameters are stored in the controller:

light intensity: for example, inner (10%)/50%/60%/70%/80%/90%/100%

Color temperature: for example, 3500K/4000K/4500K/5000K

Lighting conditions: for example, 1 surgeon/2 surgeon/large area wound/deep and narrow wound

The standby mode is enabled or disabled when the sterile switch 17 is opened or closed. The operating parameters are stored during the switch-off and can be further displayed. When the operating light is turned on, it assumes the operating state of the previously stored parameter.

In addition to the switch 17, the operating device 16 also comprises a further switch 18 for completely switching the operating light on or off. When the operating lamp is turned on, it is in a state of preset parameters (basic position). The operating device 16 has a display 19 with light-emitting diodes for displaying the intensity of the adjusted brightness of the operating light, a display 20 with light-emitting diodes for displaying the intensity of the adjusted color temperature, a display 21 for displaying the adjustment of the operating light for deep or shallow wounds, and a display 22 for displaying the adjustment of the operating light in the area of light for one or more surgeons.

The on state may be exemplified as follows:

ww is warm white

Kw is cold white

Blue color B1

Cn cyan

Claims (8)

1. An operating lamp (1) comprising: -at least one white (10a) and several colored (10b, 10c) lighting devices for lighting a surgical site, and-a central controller (15) for the lighting devices (10a, 10b, 10c), and-means for storing energy values for the lighting devices (10a, 10b, 10c) are also provided, and-said central controller (15) is designed to drive a single group comprising several lighting devices (10a, 10b, 10c), wherein the lighting devices are combined in one module or in several modules or combinations, characterized in that each module or combination is provided with said means for storing energy values, and that transmission means are provided which transmit energy values from each storage device to the central controller.

2. An operating lamp as claimed in claim 1, characterized in that the energy value can be determined in dependence on a setpoint value.

3. Operating lamp according to claim 2, characterized in that one nominal value is the color temperature of the operating lamp (1).

4. Operating lamp according to claim 2, characterized in that one nominal value is the light intensity of the operating lamp (1).

5. An operating lamp as claimed in claim 2, characterized in that one nominal value is the distribution of the light intensity on the light-emitting surface (5).

6. The operatory lamp of claim 1 wherein one energy value is amperage.

7. The operatory lamp of claim 1 wherein one energy value is a pulse train for pulse width modulation.

8. The operatory lamp of claim 1 wherein the means for storing the energy value is an eeprom.