Abstract:
An operating lamp includes a lamp body for receiving a light source, a first light source housed in the lamp body and adapted for illuminating an illumination area of an operating area, and a second light source housed in the lamp body and adapted for illuminating a central portion of the illumination area. The brightness of the second light source is controllable independently of the brightness of the first light source to enhance the brightness of the central portion of the illumination area.

Description:
CLAIM OF PRIORITY  
       [0001]     This application claims priority under 35 USC § 119(a) to European Patent application number 04004600, filed on Feb. 28, 2004, the entire contents of which are hereby incorporated by reference. 
     
    
     TECHNICAL FIELD  
       [0002]     This disclosure relates to an operating table lamp.  
       BACKGROUND  
       [0003]     Conventional operating table lamps (e.g., as described in German Patent No. 198 38 627 A1) include at least one radiation source and at least two reflectors. To produce an illumination field from the lamp with few shadows, the radiation emitted by the operating lamp impinges onto the illumination field at least two different angles of incidence. The angles of incidence of the radiation can thereby be adjusted by changing the separation between at least two reflectors or between a reflector and the radiation source.  
         [0004]     Prior art operating lamps cannot change of shape of the illuminated field (e.g., the illuminated area on the operating table) as may be required for individual applications.  
         [0005]     Conventional operating lamps have a fixed light distribution. Operating lamps must meet the requirements given in various different illumination situations. For example, large-surface wounds require a large amount of light from the edge of the lamp to prevent shadows and provide light behind obstacles. For wounds with a smaller diameter and large depth, light from the center of the lamp is required. These extreme requirements are only poorly met by conventional operating lamps, because conventional lamps generally exhibit compromises with respect to light distribution.  
         [0006]     For this reason, head lights are conventionally used today, as are optical fibers that can be introduced into the wound. However, a disadvantage of such light sources is that the head light or the optical fiber limits the operating surgeon (e.g., due to the un-ergonomic posture required of the operating surgeon to hold the head lamp) or limits the light power due to soiling and problems with hygiene when the light source is introduced into direct contact with the wound.  
       SUMMARY  
       [0007]     The invention is based, at least in part, on the recognition that improved illumination of deep wounds of small diameter can be provided by controlling a light source in the center of an operating lamp separately from the actual light source, and changing (e.g., increasing) the brightness in the center of the operating lamp. A control means of the operating lamp can control the illumination means in the center of the operating lamp independently of other illumination means and can increase the brightness in the center of the lamp independently of the rest of the operating lamp. A separate light source can be provided in the center of the operating lamp. An additional light source can be disposed in a handle located in the center of the operating lamp.  
         [0008]     In a general aspect, an operating lamp includes a lamp body for receiving a light source, a first light source housed in the lamp body and adapted for illuminating an illumination area of an operating area, and a second light source housed in the lamp body and adapted for illuminating a central portion of the illumination area. The brightness of the second light source is controllable independently of the brightness of the first light source to enhance the brightness of the central portion of the illumination area.  
         [0009]     Implementations can include one or more of the following features. For example, the second light source can include a light module, and the first light source can include a plurality of light modules that surround the first light source. The operating lamp can further include a handle mounted approximately centrally in the lamp body, and the first light source can be annularly disposed around the handle. The second light source can be disposed in the handle. The operating lamp can further include a removable sleeve adapted for mounting on the handle, and the second light source can be housed in the removable sleeve.  
         [0010]     The first light source and/or the second light source can include an LED. The operating lamp can further include a first lens adapted for widening a light beam from the first light source, and a second lens adapted for widening a light beam from the second light source.  
         [0011]     In another general aspect, a method of illuminating an operating area includes providing light from a first light source housed in a lamp body to an illumination area on the operating area, providing light from a second light source housed in the lamp body to a central portion of the illumination area, and independently controlling a brightness of the second light source compared with a brightness of the second light source.  
         [0012]     Implementations can include at least the following feature. For example, the method can further include directing light from the first light source to the illumination area in a first light beam, and directing light from the second light source to the illumination area in a second light beam, where a conical angle of the first light beam is greater than the conical angle of the second light beam.  
         [0013]     Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, suitable methods and materials are described below. All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety. In case of conflict, the present specification, including definitions, will control. In addition, the materials, methods, and examples are illustrative only and not intended to be limiting.  
         [0014]     The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the invention will be apparent from the description and drawings, and from the claims. 
     
    
     DESCRIPTION OF DRAWINGS  
       [0015]      FIG. 1  is a schematic side view of an operating lamp.  
         [0016]      FIG. 2  is a schematic perspective view of a first switched-on operating lamp with depth illumination.  
         [0017]      FIG. 3  is a schematic perspective view of a second switched-on operating lamp with depth illumination as provided by the invention.  
         [0018]      FIG. 4  is a schematic perspective view of a handle of the operating lamp shown in  FIG. 3 .  
         [0019]      FIG. 5  is a schematic perspective view of a switched-on operating lamp with depth illumination.  
         [0020]      FIG. 6  is a schematic perspective view of a switched-on operating lamp with depth illumination.  
         [0021]      FIG. 7  is a schematic perspective view of a switched-on operating lamp with depth illumination. 
     
    
       [0022]     Like reference symbols in the various drawings indicate like elements.  
       DETAILED DESCRIPTION  
       [0023]     As shown in  FIG. 1 , an operating lamp  1  includes a lamp body  2  having an inner space that houses an illumination means (not shown in  FIG. 1 ). The lamp body  2  can be mounted on a stationary holder on a ceiling or wall of a building or on a mobile unit, such that it can be pivoted via a pivot arm (which is not completely shown in  FIG. 1 ). The pivot arm is formed from several elements that are interconnected byjoints. An element  4  of the pivot arm that is rigidly connected to the operating lamp  1  is indicated in  FIG. 1 . The operating lamp  1  can therefore be moved and pivoted in three dimensions in the X, Y, and Z directions. A handle  3  mounted to the lamp body  2  permits positioning of the operating lamp  1  at any location above an operating table. The handle  3  is detachably disposed on the lower side  5  of the operating lamp. Light is emitted on the lower side  5  of the operating lamp  1  to illuminate the area of an operation.  
         [0024]     As shown in  FIG. 2 , an annular light source  6  includes several light emitting diodes  8  (“LEDs”) mounted on the light emitting surface of the lamp body  2  around the edge of the handle  3 . The handle  3  can be sterilized for use in an operating environment. The light source  6  generates an illumination field  7   b  with light beams  6   b . The illumination field  7   b  supports an illumination field  7   a  of the operating lamp, which is generated by the light beams  6   a . The illumination field  7   a  can be created by an additional light source  58  that is spans a surface area larger than the surface area of light source  6 . For example, light source  58  can be a large mirror for reflecting light onto the illumination field  7   a  or can be one or more light source that radiate light directly onto illumination field  7   a . Thus, the light beams of the light source  6  are focused to the center of the illumination field  7   a , and the illumination field  7   b  improves the depth illumination in the center of the illumination field  7   a . The intensity of the light source  6  may be correspondingly controlled to optimize the depth illumination.  
         [0025]     As shown in  FIGS. 3 and 4 , several LEDs  8  can be disposed as an additional light source  8  on the sterilizable central handle  3 . Light beams  8   b  can be emitted by the light source  8  such that an additional illumination field  9   b  is generated in the center of the illumination field  9   a  that is generated by the light beams  8   a  from an additional light source  58 .  
         [0026]     As shown in  FIG. 4 , the handle  3  can include a sleeve  10  that can be detachably mounted to the operating lamp  1 . The detachable sleeve  10  can be mounted to the operating lamp  1  via a flange  11 , and the sterilizable handle  3  can be removed from the lamp body for cleaning and sterilization. Locking and release of the handle  3  from the operating lamp  1  can be achieved using an actuating element  12  that can release a catch. Several LEDs  8  that generate white light are disposed in a free end of the sleeve  10 , such that light can be emitted from the sleeve  10 . The light can be emitted through a bore in the handle  3 , through a transparent window that optionally covers the bore, or through a handle of transparent material. To guide the beams in a parallel direction, the LEDs  8  can be associated with lens elements. The additional illumination from the light source  8  may be switched on as required.  
         [0027]     As shown in  FIG. 5 , individual light modules  13 - 19 , which can be combined in arbitrary combinations, can each include a plurality of LEDs for generating an illumination field  20 . The intensity of light from the central light module  19  can be increased to produce a light beam  23  and an additional illumination field  21  that is superposed on the illumination field  20  from the light beam  22 . The additional illumination field  21  from the central light module can be used to illuminate deep wounds.  
         [0028]     As shown in  FIG. 6 , a light source can include individual illumination means  24   a ,  24   b , and  24   c  that are surrounded by lenses  40   a ,  40   b , and  40   c  provided to widen the light beams from the illumination means and to generate light beams  27 - 29  that create an illumination field  26 . The intensity of the illumination field  26  can be increased in the center  30  by increasing the intensity of the light source  24   c , such that the intensity of the central light beam  29  is higher than the radiation in the edge regions of the illumination field  26 .  
         [0029]     As shown in  FIG. 7 , an operating lamp  1  can include a resolved light system formed by individual lamps  31 - 35  and a handle  36  disposed at the edge of the system. The central lamp  35  generates a light beam  37  having increased intensity compared with surrounding light, such that an illumination field  38  has a higher brightness in its center  39  than at its edges to illuminate deep wounds.  
       OTHER EMBODIMENTS  
       [0030]     A number of embodiments of the invention have been described. Nevertheless, it will be understood that various modifications may be made. Accordingly, other embodiments are within the scope of the following claims.