DE102012201706A1 - Operating light has multiple light emitting diodes for determining illumination of operating field and secondary reflector, which directs light emitted by light emitting diode on to operation field - Google Patents

Abstract

The operating light has multiple light emitting diodes for determining illumination of an operating field and a secondary reflector (14), which directs the light emitted by the light emitting diode on to the operation field. The light emitting diode is available as a light emitting diode module (11), which is arranged on the secondary reflector or in a receptacle in the area of its optical axis.

Description

The invention relates to a surgical lamp according to the preamble of the main claim.

Operating lights for illuminating the surgical field in surgical procedures are known. Such luminaires are required to illuminate the surgical field well, not only on the surface of the patient, but also in the depth of the surgical wound. This can be achieved by focusing at least a central region of the light beam onto the wound. In order to allow freedom of movement for physicians and staff, the surgical light must be at a sufficient distance from the operating area, usually about 1 m, which requires considerable light intensities. The illumination should be affected as little as possible by movements of persons employed in the operation between the luminaire and the operating area. For this purpose, it is customary to equip the luminaires either with a large reflector mirror (monoreflector, eg 70 cm diameter) or with a plurality of independently adjustable light sources (so-called resolved light system). Finally, as little heat as possible should be radiated onto the operating field in order to avoid aggravation for the surgeon and the patient and undesired convection of the ambient air, which can cause dehydration and contamination of the wound. In conventional luminaires, therefore, mirrors are used which selectively reflect light and transmit heat radiation.

Recently, light-emitting diodes (light-emitting diodes, LED) have been considered for such luminaires because they have a better efficiency compared to conventional light sources, such as halogen or discharge lamps, that is, generate less heat compared to the light obtained , LEDs were used both in large mirror lights and in lights with dissolved light system. Examples are on the one hand DE 10 2006 0040995 A1 for a monoreflector, on the other hand DE 10 2007 048 115 A1 called for a dissolved light system. In any case, the light emitting diodes are distributed over a larger area of the lighting system in order to dissipate the heat effectively. The individual LEDs can be equipped with so-called TIR lenses, which focus the light of each individual LED. Such lenses are known and, for example, in WO 1997/001728 A1 or EP 117606 A1 described.

The disadvantage here is that the lights are relatively large, heavy and expensive by such a structure. This involves both the individual optics of the LED as well as facilities for heat dissipation. The conversion to other or novel LED is very complex in this structure.

Accordingly, the invention has the object to propose a surgical light with LED, which is easier and cheaper to manufacture and allows easy conversion.

This object is achieved by a surgical lamp according to the main claim.

Under LED module here is a relatively dense arrangement of multiple LED on a common carrier to understand. Due to the dense arrangement high luminance can be achieved. The individual LEDs can either focus light or emit diffuse (lambertsch). The arrangement on the secondary reflector or in a recess in the reflector effective cooling of the LED module is possible. For this purpose, for example, the LED module heat is conductively connected to the reflector, which in turn consists of heat-conducting material and distributes the heat and to the environment, emits. The dissipation of heat can be supported if a heat sink is heat-conductively mounted on the LED module opposite the back of the reflector. A third possibility is to insert the LED module in a recess in the reflector surface and connect directly to a heat sink. So you can achieve effective cooling even with LED modules with high heat output. In addition, the heat sink may be further cooled with a fluid coolant such as air or water that can be forcibly moved. Finally, a heat pipe (heat pipe) can be used for heat dissipation.

In this arrangement of the LED module, the luminous flux is directed substantially out of the reflector, but not focused. In order to achieve a focus through the secondary reflector, a deflection reflector is arranged in the luminous flux, which deflects the light emanating from the LED module to the secondary reflector. The deflecting reflector is preferably high-gloss and provided with a reflection-enhancing surface in order to avoid losses due to scattering and false reflection as possible. Secondary reflector and deflecting reflector are generally designed rotationally symmetrical and matched with their surfaces to one another that results in the desired illumination of the surgical field. Accordingly, the deflecting reflector may have the shape of a cone, but shapes are also possible in which the lateral line of the cone is bent convexly or concavely. The deflecting reflector can be designed as a mirror or even with a totally reflecting surface in the manner of a deflecting prism.

The reflecting surfaces of the deflecting reflector and of the secondary reflector can be structured facetted in a known manner.

Suitable for the execution of the invention, for example, LED modules from OSRAM GmbH, which are offered under the brand PrevaLED Core Light Engines.

An operating light according to the invention can also be provided with a plurality, for example two to five, LED modules. These are all then mounted near the optical axis of the secondary reflector. Although the light output of modern LED modules may suffice to illuminate an operating field, using several LED modules offers additional advantages: you can quickly switch from one light color (spectral composition) of the light to another, and there is always at least one module ready as an immediately usable reserve.

When the LED module is arranged for a conical or Lambertian radiation, it is expedient to arrange an optical system for the alignment and transmission of the light, which is called a primary optical system, between the module and the deflection reflector. This primary optical system may comprise, for example, a focusing reflector, a light guide and / or a TIR lens. The light guide can be a hollow body, for. Example, a tube whose cross-section may be cylindrical, square or rectangular, for example, and may extend to the light exit opening, with mirrored and / or reflection enhancing executed inner surface and / or a solid body with total reflection on the side walls. A TIR lens may comprise the entire LED module.

The primary optical system is particularly advantageous if there are several LED modules in the operating light. It can then serve to combine the luminous flux into a common luminous flux and to guide it to the deflecting reflector. Branched optical fibers are particularly suitable for this purpose.

The gaps between the LED module and the primary optical system on the one hand and this and the deflection reflector on the other hand are preferably kept as small as possible in order to avoid that light is lost when entering or leaving the primary optical system. In light guides, input and output losses can also be reduced by the fact that the input and output surfaces are suitably shaped, for example, spherical concave or convex.

In order to change the focusing of the light on the surgical field, for example, to adapt to the distance between the surgical light and the patient, the deflection reflector is advantageously arranged displaceable, and particularly advantageous in the optical axis of the secondary reflector. It may be advantageous to make the primary optical system variable in length. For example, this can be realized with a light guide in which a solid body in a suitable hollow body, for. B. a cylinder in a tube, is telescopically displaceable.

The secondary reflector and possibly also the primary reflector and the deflection reflector can have smooth or even facetted surfaces.

The secondary reflector preferably also comprises a cover plate made of a light-transmitting material, for example Plexiglas, arranged in the light exit plane. This can be plane-parallel and is then not involved in the focusing of the light. But it can also include a stepped lens of concentrically arranged prism rings. These prism rings are advantageously calculated and executed in such a way that they always focus the light reflected by the secondary reflector into the plane of the operating area (evaluation plane of the luminaire). Such a stepped lens then generally has no uniform focus for collimated light. Alternatively, it may also be advantageous if the outer regions of the Fresnel lens focus in the evaluation plane and the inner regions in a farther away plane, because the illumination of deep wounds is improved.

The invention will now be explained in more detail by means of embodiments by means of the accompanying drawings. Show it

1 a first embodiment of the surgical light according to the invention,

2 a second embodiment of a surgical light according to the invention,

3 a third embodiment of a surgical light according to the invention,

4 A fourth embodiment of a surgical light according to the invention,

5 various forms of optical fibers which are usable according to the invention as a primary optical system,

6 the function of a cover.

In the 1 illustrated operating light 10 has a secondary reflector 14 with a diameter of for example 70 cm, in the optical axis A in a recess 15 an LED module 11 is used. This module is on the back with a heat sink 12 connected. That of the LED module 11 emitted light L falls partly directly and on the other part after reflection on a primary reflector 16 on the deflection reflector 13 from which it points to the reflective inside of the secondary reflector 14 is reflected and focused in the valuation level, not shown here.

2 shows a second embodiment of a lamp according to the invention, in which the primary optical system through a light guide 22 realized in the form of a solid cylinder with total reflection on the lateral surface, with its entrance surface to the LED module 11 connects and so all the light emitted by the LED module light on the deflection reflector 13 passes. The LED module is here connected to the secondary heat-conducting reflector, which is the one from the module 11 ' dissipated heat loss distributed in the area.

3 represents a surgical light, wherein the deflection reflector 13 between the positions 13a and 13b in the optical axis A of the system in the direction of the double arrow P can be moved. To the small distance between the light guide 32 and the deflecting reflector 33 to be able to maintain in any position, the light guide is designed here as a telescope, in which a solid cylinder 34 in a tube 35 is displaceable. pipe 35 and cylinders 34 are selected and designed so that the light is totally reflected on the outer lateral surfaces.

In 4 an operating light according to the invention with two LED modules is shown. These can be, for example, modules with different spectral composition of the emitted light, which can be operated simultaneously or alternately. For example, both modules have different color temperature, corresponding to daylight and artificial light. The light guide 44 is executed here with a branching, so that he puts the light of both modules on the deflecting reflector 13 merges.

In 5 different forms for optical fibers are shown: a) a simple cylinder, b) a branched optical fiber, c) a triple-branched optical fiber, each in perspective, d) a telescopic combination of solid cylinder and tube, e) a cylinder with a convex outlet surface, f) a Cylinder with concave outlet surface, each in section, g) an expanding tube with a square cross section and h) an expanding tube with a circular cross section, respectively in longitudinal section and in plan view.

6 finally shows the effect of a cover 61 . 62 , While the plane-parallel cover 61 that of the secondary reflector 14 Reflected light without direction change to the operating area OG lets happen is through the Fresnel lens 62 the light is additionally broken, making it the deep wound 63 better illuminates.

LIST OF REFERENCE NUMBERS

10

surgical light

11

LED module

12

heatsink

13, 13a, 13b

-deflector

14

secondary reflector

16

primary reflector

22

optical fiber

32

optical fiber

33

-deflector

34

solid cylinders

35

pipe

44

optical fiber

61

plane parallel cover

62

fresnel lens

62

wound

OG

area of operations

A

optical axis

L

beam of light

P

shift direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 20060040995 A1 [0003]
• DE 102007048115 A1 [0003]
• WO 1997/001728 A1 [0003]
• EP 117606 A1 [0003]

Claims (9)

An operating light, comprising at least a number for illuminating an operating field of particular LED and a secondary reflector, which can direct the light emitted by the LED light on the surgical field, characterized in that the LED as at least one LED module present on the secondary reflector or in a Recess therein is disposed in the region of its optical axis and the luminous flux is directed substantially out of the secondary reflector, and in that the lamp further comprises a deflecting reflector, which deflects the light emitted by the LED module to the secondary reflector. Operation light according to claim 1, characterized in that it is further provided with a heat sink accessible from the rear of the secondary reflector. Operating light according to claim 2, characterized in that it comprises a primary optical system which directs the light emitted by the LED module to the deflection reflector. Surgical light according to claim 3, characterized in that the primary optical system comprises a light guide, a focusing reflector or a TIR lens. Operating light according to claim 4, characterized in that the light guide comprises a tube whose cross-section is cylindrical, square or rectangular, with mirrored and / or reflection enhancing executed inner surface, and / or a solid body with total reflection on the side walls. Surgical lamp according to claim 5, characterized in that the cross section of the light guide widens towards the light exit. Operating light according to claim 4, 5 or 6, characterized in that the light guide can merge the light of several LED modules. Operating light according to one of claims 1 to 7, characterized in that the deflection reflector is displaceable. Operating light according to one of claims 4 to 8, characterized in that the light guide comprises a tube and a telescopically displaceable therein solid body.

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