EP1590602A1

EP1590602A1 - Illumination device

Info

Publication number: EP1590602A1
Application number: EP04706708A
Authority: EP
Inventors: Olivier Derrien; Jérôme MONNOT
Original assignee: Maquet SAS
Current assignee: Maquet SAS
Priority date: 2003-02-06
Filing date: 2004-01-30
Publication date: 2005-11-02
Also published as: CN1745274A; TW200422557A; WO2004079259A1; FR2851028B1; CN100494768C; US20060082997A1; FR2851028A1; JP2006517337A; JP4361931B2

Abstract

The invention relates to an illumination device for illuminating an illuminated field (4), comprising an illumination support (6) with a dome (12), a first light source (20) and a second light source (40), separate from said first light source (20). Said second light source (20) is arranged on the same side of the dome (12) as the first light source (20). The illumination device (10) comprises an optical dispersion device (44) for spreading the beam of light from the second light source (40) towards the illuminated field (4), which is arranged between the second light source (40) and the illuminated field (4). The above finds application to illumination devices in operating theatres.

Description

Lighting device

The present invention relates to a lighting device as defined in the preamble of claim 1. The invention applies in particular to lighting devices for an operating field in operating rooms.

Document US-B-5, 539, 626 describes a lighting device suitable for lighting a field of operation. The lighting device includes first and second lighting assemblies.

The first lighting assembly is adapted to illuminate the field of operation with high intensity on a lighting area having a relatively limited extent. It includes a light source adapted to emit light directly towards the field of operation. This first lighting assembly is used, for example, when introducing endoscopes into the body of a patient.

The second lighting assembly is adapted to illuminate the operating field and the environment of the operating field with diffuse light having a lower intensity than that created by the first assembly. This second lighting assembly includes two lamps, the emission directions of which are directed towards the ceiling of the operating room. Consequently, the field of operation is only indirectly illuminated by this second set.

The second lighting assembly is used for example after the introduction of endoscopes in order to monitor the surgical intervention on observation monitors. The lighting device further comprises selection means adapted to alternately select the first or the second of the lighting assemblies. A drawback of this lighting device lies in the fact that, for a given diffuse lighting of the operating field by the second set, a relatively high power of the two lamps is necessary. Moreover, the diffuse lighting depends on the properties of the material constituting the ceiling and can not be predetermined during the construction of the lighting device ^1.

The object of the invention is to remedy these drawbacks and to propose a lighting device which allows diffuse and predetermined lighting of the operating field while having low energy consumption.

To this end, the subject of the invention is a lighting device of the aforementioned type, characterized by the characteristics of the characterizing part of claim 1.

According to other embodiments, the invention includes one or more of the features of the dependent claims.

The invention will be better understood on reading the description which follows, given solely by way of example and made with reference to the appended drawings, in which:

- Figure 1 is a side view, in section along the line I-I of Figure 2, of a lighting device according to a first embodiment of the invention;

- Figure 2 is a bottom view of the first embodiment of the lighting device according to the invention;

- Figure 3 is a view of a second embodiment of the device according to the invention, the view being identical to the view of Figure 1; and

- Figure 4 is a bottom view of the device of Figure 3. In Figure 1 is shown a first embodiment of a lighting device in an operating room, designated by the general reference 2.

The lighting device 2 is adapted to illuminate a lighting field 4, for example a field of operation of a surgeon on a patient. The lighting field 4 extends along a substantially horizontal lighting plane E-E.

The lighting device 2 comprises a housing 6 and first 8 and second 10 lighting assemblies arranged above the lighting field 4. The housing 6 defines a central axis CC extending substantially perpendicular to the lighting plane EE.

The housing 6 forms a lighting support for the first 8 and second 10 lighting assemblies.

It comprises an opaque quadrilobed bell 12 comprising four lobes 14. The four lobes 14 extend in the same plane and project radially with respect to the central axis C-C. The bell 12 is substantially closed on the opposite side of the lighting field 4 and delimits an opening 16 on the side facing the lighting field 4. The bell 12 is further provided with two handles 17A, 17B.

The housing 6 further comprises a substantially transparent closure plate 18 which closes the opening 16 of the bell 12.

The bell 12 and the closing plate enclose an internal volume V.

Each lobe 14 extends along one of two median planes M-M which extend radially to the central axis C-C and perpendicular to each other (Figure 2).

The first lighting assembly 8 defines a first lighting axis XX arranged coaxially with the central axis C- C. This lighting assembly 8 comprises a bulb 20, a central lens 22 of diameter Di, and four identical groups 24 of filter and mirror.

The bulb 20 is arranged in the interior volume of the bell and has a nominal power of between 100 W and 150.

Each group 24 of filter and mirror consists of two lateral lenses 26 and 28, arranged parallel to the lighting axis XX, of a mirror 30, and of a multitude of micro-focusing lenses 31 secured to the closure plate 18. The lateral lenses 26 and 28 and the mirror 30 of each group 24 are arranged in a position relative to one another along one of the median planes MM and radially to the central axis CC in one of the lobes 14. The mirror 30 is adapted to reflect part of the light emitted by the bulb 20 towards the microlenses 31.

The first lighting assembly 8 is adapted to illuminate the lighting field 4 in a first direction of lighting SEl extending from the housing 6 towards the lighting field 4, therefore substantially vertically from top to bottom in the Figure 1 and coaxially with the axis XX.

The second lighting assembly 10 comprises a second bulb 40, in particular an incandescent bulb, disposed in a parabolic reflector 42 arranged inside the interior volume of the bell 12, as well as an opal glass member 44.

The nominal power of the second bulb 40 is between 15 Watts and 25 Watts, and preferably amounts to 20 Watts.

In this case, the opal glass member 44 consists of a circular part of opal glass secured to the closure plate 18. This opal glass member 44 is arranged in the ray tracing emitted by the bulb 40 and of the reflector 42 and is adapted to widen a beam of light emitted by the second bulb 40. Thus, the opal glass member 44 forms an optical widening element.

The second bulb 40, the reflector 42 and the optical member 44 are arranged coaxially with one another and along a second lighting axis Y-Y. The lighting axis Y-Y is advantageously arranged in a bisecting plane B-B of the two median planes -M (Figure 2). The two axes X-X and Y-Y define between them an angle between 0 ° and 10 °, and preferably 6 °.

Thus, the second lighting assembly 10 is adapted to emit light in a second direction of lighting

SE2 directed from the bulb 40 towards the lighting field 4. In general, the direction SE2 has a component directed in the same direction as SEl.

The multitude of micro-lenses 31 and the optical element 44 extend at a distance d from the lighting field 4. This distance d is between 0.8 m and 1.60 m.

The first lighting assembly 8 is adapted to illuminate the lighting field 4 on a lighting domain 46 with a first illumination, greater than 50,000 lux and preferably greater than 70,000 lux, when the distance d is one meter. The lighting area 46 has a diameter of one meter and is centered on the axis CC. Thanks to the bulb 40 and the member 44, the second lighting assembly 10 is adapted to illuminate the lighting domain 46 at a distance d of one meter with an illumination of between 50 lux and 150 lux, and of preferably between 75 lux and 125 lux. The first lighting assembly 8 further comprises a first supply line 50 connected to the first bulb 20 and the second lighting assembly 10 comprises a second supply line 52 connected to the second bulb 40 .. The device 2 is further provided with a main supply line 54, as well as means for selecting the first 8 or the second 10 lighting assemblies. These selection means comprise a reversing switch 58 disposed in the handle 17A. This reversing switch 58 is connected to the main supply line 54 and makes it possible to alternately connect the first 50 or the second 52 supply lines to the main supply line 54.

The lighting device 2 further comprises a main switch 60, interposed in the main supply line 54 and allowing control of the supply of the lighting device 2.

The fact that the closing plate 18, the microlenses 31 and the opal glass part 44 are made in one piece facilitates the assembly of the lighting device.

The lighting device according to the invention operates as follows.

Initially, the main switch 60 is in its open configuration, so that the device 2 is not supplied with current.

The reversing switch 58 is in a first configuration, in which it connects the main supply line 54 to the first supply line 50. When the surgeon wishes to illuminate the lighting field 4 with a high intensity, that is that is to say an important illumination, for example 70,000 lux, it closes the main switch 60. Thus, the first lighting assembly 8 is supplied with current and the first bulb 20 emits light. A first part of the light emitted is focused by the central lens 22 on the lighting domain 46. A second part of the light emitted by the first bulb 20 passes through the side lenses 26 and 28 and is reflected by the mirrors 30. The part of the light reflected by the mirrors 30 is focused by the microlenses 31 on the lighting domain 46.

When the surgeon needs less lighting from the lighting area 46, he actuates the reversing switch 58.

Consequently, the second supply line 52 is supplied with electricity while the first supply line 50 is no longer supplied. The second bulb 40 then emits light which is guided by the reflector 42 by forming a beam 70. This beam 70 is directed towards the opal glass part 44 of the closure plate 18, and is widened by this part. The lighting field 4, and in particular. the lighting area 46 is therefore illuminated by a diffuse beam of light of lower intensity than that of the first lighting assembly.

At least part of the light emitted by the second bulb 40 moves over the entire path between the second bulb 40 and the lighting field 4 in the direction SE2. Thanks to this characteristic, the distance traversed by light between the second bulb 40 and the lighting field 4 is relatively short, and therefore a low power of the second bulb 40 is sufficient for a given illumination of the field of lighting 4.

It should be noted that the illumination created by the second lighting assembly 10 is in the order of magnitude of the light intensity of an observation monitor for an endoscopic intervention.

In Figures 3 and 4 is shown a lighting device 2 according to a second embodiment of one invention.

In what follows, only the differences with respect to the first embodiment will be described. Similar elements have the same references. The second lighting assembly 10 comprises a plurality of light-emitting diodes 80 (LEDs). These light-emitting diodes 80 are arranged on a pitch circle 82 of diameter D _a and form two segments of a ring 84 extending around the lighting axis YY.

Each segment extends over an angle α of at least 90 ° and preferably at least 150 °.

The ring 84 is located substantially coplanar with the central lens 22. The lighting direction SE2 is the sense of light emission from each of the light-emitting diodes 80. It is directed parallel to the axis YY and towards the field d lighting 4. The diameter D _a of the pitch circle is greater than the diameter Di of the central lens 22 of the first lighting assembly 8 so that the LEDs 80 extend outside the tread of the rays of the first lighting assembly 8 .

The optical enlargement member is formed by a ring segment 86 of opal glass disposed in the closure plate 18 and extending over an angle which is at least equal to the sum of the angles α.

The ring segment 86 has a pitch circle of diameter D _a and a width 1_, which is greater than the diameter of the light-emitting diodes 80. Thanks to the use of LEDs 80, the second lighting assembly 10 has a consumption particularly low and a long service life.

The lighting device 2 according to the invention makes it possible to illuminate the operating field 4 with diffuse light while having a low energy consumption.

All the optical components located in the path of the rays from the light sources towards the lighting field are carried by the housing 6. Consequently, the properties of the lighting can be predetermined and depend little on the environment.

In general, the intensity or the illumination of the first lighting assembly is much higher than the intensity or the illumination of the second lighting assembly. The illumination of the first lighting assembly is at least 10,000 lux greater than the illumination of the second lighting assembly. Preferably, it is at least 25,000 lux and in particular 35,000 lux higher.

Claims

CLAIMS 1. Lighting device adapted to illuminate a lighting field (4), of the type comprising:

- a lighting support (6) having a bell (12), - a first lighting assembly (8) which is carried by the lighting support (6), which comprises a first light source (20), arranged opposite the lighting field (4), and which is adapted to illuminate a lighting field (46) of the lighting field (4) with a first intensity in a first direction of lighting (SEl) s' extending from the lighting support (6) towards the lighting field

(4)

- a second lighting assembly (10) which is carried by the lighting support (6), which comprises a second light source (40; 80) distinct from said first light source (20) and which is adapted for illuminate the lighting area (46) with a second intensity in a second direction of lighting (SE2), characterized in that said second light source (20) is arranged on the same side of the bell (12) as said first light source (20), in that said second lighting assembly (10) comprises an optical widening element (44; 86) adapted to widen a beam of light emitted by said second light source (40; 80) towards the lighting field (4), which widening optical element is carried by the support (6) and interposed between the second light source (40; 80) and the lighting field (4), that said second direction of lighting (SE2) has a component parallel to said first direction of lighting (SEl) and directed in the same direction, and in that at least part of the light emitted by said second light source (40; 80) moves over the entire path in said second direction of lighting (SE2).

2. Lighting device according to claim 1, characterized in that the bell (12) delimits an interior volume (V), and in that said first (20) and second (40; 80) light sources are arranged at inside the interior volume (V).

3. Lighting device according to claim 1 or 2, characterized in that the bell (12) is made of an opaque material.

4. Lighting device according to one of claims 1 to 3, characterized in that said first lighting assembly (8) is adapted to illuminate the lighting area (46) when the latter is located at a distance (d) of 1 m from said widening optical element (44; 86) with a first illumination, and in that the lighting area (46) has a diameter of 1 m.

5. Lighting device according to claim 4, characterized in that the first illumination is greater than 50,000 lux, and preferably greater than 70,000 lux.

6. Lighting device according to claim 4 or 5, characterized in that said first lighting assembly (8) defines a first lighting axis (XX) and comprises a first optical focusing element (22) adapted to focus part of the light emitted by said first light source (20) on the lighting field (4), in that said first light source comprises a first bulb (20), and in that said first bulb (20) and said first optical focusing element (22) are arranged coaxially with said first lighting axis (XX).

7. Lighting device according to claim

6, characterized in that said first optical focusing element is an optical lens (22).

8. Lighting device according to any one of the preceding claims, characterized in that the widening optical element comprises an opal glass member (44; 86).

9. Lighting device according to any one of the preceding claims, characterized in that the support (6) comprises a transparent closure plate (18) disposed between said first light source (20) and the field of lighting (4) as well as between said second (40, 80) light source and the lighting field (4), and in that the closing plate (18) is provided with the widening optical element ( 44, 86).

10. Lighting device according to claim

9, characterized in that said first lighting assembly (8) comprises a second optical focusing element (31), in particular a multitude of micro-lenses, and in that this second optical focusing element (31) is carried by the closing plate (18).

11. Lighting device according to claim

10, characterized in that the closure plate (18), said second optical focusing element (31) and the optical widening element (44, 86) are made in one piece.

12. Lighting device according to any one of the preceding claims, characterized in that said second light source comprises a bulb (40), in particular an incandescent bulb, and preferably a bulb having a nominal power of between 15 W and 25 W, and in particular 20 W.

13. Lighting device according to claim 12, characterized in that said second lighting assembly (10) comprises a reflector (42) and defines a second lighting axis (YY) which is distinct from said first lighting axis (XX).

14. Lighting device according to any one of claims 1 to 9, characterized in that said se- This light source includes a plurality of light emitting diodes (80).

15. Lighting device according to claim 14, characterized in that each of the light-emitting diodes (80) has a direction of emission (SE2) of light, and in that all the directions of light emission are parallel each other .

16. Lighting device according to claim 14 or 15, characterized in that the plurality of light emitting diodes (80) forms a ring (84) having a third lighting axis (Y-Y).

17. Lighting device according to claims 6 and 16 taken together, characterized in that the third lighting axis (Y-Y) is arranged coaxially to said first lighting axis (X-X).

18. Lighting device according to any one of claims 1 to 17, characterized in that said second lighting assembly (10) is adapted to illuminate the lighting area (46) when the latter is located at a distance I m from said widening optical element (86) with a second illumination, and in that the lighting domain (46) has a diameter of I m.

19. Lighting device according to at least claims 4 and 18 taken together, characterized in that the first illumination is significantly greater than the second illumination.

20. The lighting device as claimed in claim 19, characterized in that the first illumination is at least 10,000 lux greater than the second illumination.

21. Lighting device according to claim

20, characterized in that the first illumination is at least 25,000 lux, and preferably at least 35,000 lux, greater than the second illumination.

22. Lighting device according to any one of claims 18 to 21, characterized in that the second lighting is between 50 and 150 lux, and preferably between 75 lux and 125 lux.

23. Lighting device according to any one of the preceding claims, characterized in that it comprises selection means (58) which are adapted to supply alternately one or the other of said first (8) and second ( 10) lighting sets.

24. Lighting device according to any one of the preceding claims, characterized in that the lighting device (2) is a device for lighting an operating field (4) in an operating room.