Abstract:
A replaceable LED assembly for medical instruments and medical devices including at least one LED(light emitting diode) to be used with the medical instruments that are using incandescent lamps or xenon lamps as illumination source. This LED illumination assembly will also allow exchange of LED lamp&#39;s without the use of heat, solder, mechanical tools or physical force beyond the use of hand pressure.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims the benefit of provisional patent applications with Ser. No. 61/275,383 filed 2009 Aug. 28, by the present inventors. 
     
    
     FEDERALLY SPONSORED RESEARCH 
       [0002]    Not Applicable 
       SEQUENCE LISTING OR PROGRAM 
       [0003]    Not Applicable 
       BACKGROUND OF THE INVENTION 
       [0004]    1. Field of the Invention 
         [0005]    This invention relates generally to a LED illumination assembly that is suitable for the medical instruments and in particularly this invention relates to replacing the LED lamp in the illumination assembly of the medical instruments. 
         [0006]    2. Prior Arts 
         [0007]    Physicians employ illumination assembly in medical instruments and devices to observe, record, take measurement and assist surgeries. Theses illumination assembly was used in both surgical and diagnostic microscope&#39;s, including but not limited to, for example, the slit lamp, the specular microscope, and the fundus camera, and various endoscopes that delivered the light via optical fiber into patients&#39; body. Currently, Incandescent lamps, including halogen added Incandescent type incandescent lamps, and Xenon lamps are two major light sources for illumination of medical instruments and devices. The light emitted by incandescent lamps and the light emitted by Xenon lamps have very different spectrums. Incandescent lamps produce mostly long wavelength red radiation and Xenon flash lamps produce shorter wavelength blue-green radiation. Because of the differences in the spectrums, the reflection and scattering patterns of these two light sources are different. In clinical environment, physicians found that illuminated with different spectrum of lights revealed more information of the tissue health. It is therefore desirable for a light source that can be easily switch from one spectrum to another spectrum without complicate electrical, mechanical and optical arrangement in the medical instruments or devices. 
         [0008]    Light emitting diode(LED) is a solid state light source that provides low energy consumption, spectrum range and temporal properties that were not attainable by the Incandescent lamp and/or Xenon lamps. But implementing LED into medical instruments and medical devices requires different design innovation that must accommodate all the unique features of the solid state devices. For example, LED can not function at temperatures higher than 75° C. while Incandescent lamps would be most stable at higher temperatures. Also, because LED has different radiation pattern from the incandescent and Xenon lamps There was no illumination assembly of LED in the medical instruments and medical devices that can accommodate these requirements and the need to change the LED&#39;s for different spectrum output or for the replacement. Our invention to accommodate all the unique features of the LED illumination is described in the following embodiment. 
         [0009]    In many typical mounting arrangements, LEDs are mounted in a mounting assembly or mount which is then soldered to a printed circuit board(PCB) using reflow surface mount techniques. In such arrangements, to remove and replace a defective or burnt out LED, or to change one LED for another, it is necessary to heat the solder holding the original LED mount in place to its melting point and then remove the original mount, clean the board, and then to resolder a replacement LED mount in its place. Alternatively, a whole new replacement board may be utilized to avoid the steps of replacing LED mount completely. Both of these approaches have their drawbacks with respect to ease of replacement, cost or the like. 
         [0010]    In an alternative approach, an LED has been mounted in a thread sleeve which fits in a traditional incandescent light bulb socket. While such an arrangement may have the benefit of being easy to replace in a manner intuitively obvious to the average consumers, it suffers from having a relatively bulky form factor that may prevent optimal design of a lighting fixture to take advantage of the small size of the LED light source. It also has a relatively costly. 
         [0011]    Additionally, multiple LED fixtures are becoming more prevalent. These fixtures do not typically have a sufficiently easy and cost effective mechanism for replacing LED&#39;s. 
       OBJECTS AND ADVANTAGES 
       [0012]    It is therefore a primary object of the present application is to overcome the above noted deficiency or the prior arts. 
         [0013]    It is another primary object of the present application to develop a LED assembly that can replace known medical instrument that utilizing incandescent lamps or Xenon lamps for illumination. 
       SUMMARY OF THE INVENTION 
       [0014]    In accordance with the present invention, a LED illumination assembly can be used in medical instrument to replace the incandescent lamps and xenon lamps. 
         [0015]    In one innovative aspect, the present innovation relates to the use of releasable and removable LED lamp in the illumination assembly. 
         [0016]    In another innovative aspect, the present innovation relates to use of human hand, instead of soldering and electrical power, to replace LED in a medical instrument with a power supply. 
         [0017]    In another innovative aspect, the present innovation relates to the use of different LED lamp in the same medical instrument without interfere with the electrical, mechanical and optical environment of the medical instrument. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0018]    The nature and mode of operation of the present invention will now be more fully described in the following detailed description of the invention taken with the accompanying drawing figures, in which: 
           [0019]      FIG. 1  illustrates the side view of LED illumination assembly. 
           [0020]      FIG. 2  illustrates another three dimensional view LED illumination assembly. 
       
    
    
     DETAILED DESCRIPTION 
       [0021]    In the description that follows, like parts are indicated throughout the specification and drawings with the same reference numerals. The present invention is not limited to the specific embodiments illustrated herein. 
         [0022]      FIG. 1  and  FIG. 2  show a schematic view of an embodiment according to the present invention. Referring to  FIG. 1  and  FIG. 2 , the light from the light emitting diode (LED) or LED array  102  is projected along projection axis  11  through projection optical element  101  onto the light beam shaping components of the medical instrument. In one embodiment, projection optical element  101  may comprise a single optical element. In other embodiment, projection optical element  101  may comprise multiple optical elements such as a compound lens or other type of optical elements, including but not limited to the diffractive type of element. In one embodiment, such optical element includes but not limited to the diffusers. In another embodiment, such optical element includes but not limited to the optical filters to select certain wavelength of the light. Projection optics is well known to one skilled in the art and does not require an explanation. In one embodiment, LED  102  contains at least one LED. In another embodiment, LED array  102  is an LED light pattern generator. In one embodiment, the LED or LED array will emit a portion of the visible light spectra with limited bandwidth. In other embodiments, the LED or LED array will emit a white light. The color of the white light can be further controlled by adjusting the electrical power delivered into each individual LED&#39;s in the LED array arrangement. This LED or LED array  102  is fastened to the Light Module or LED lamp  103  via fasten elements  111 . In current embodiment, the fasten elements  111  are a set of screws. The electrical component of the LED lamp  103  is designed with connector component  104 . The LED lamp  103  also provides the heat dissipation structures that will incorporate into the major heat dissipation component  105 . In current embodiment, the main heat dissipation component  105 , has multiple heat transfer configurations,  106 , including but not limited to at least two heat conducting fins are incorporated to facilitate the heat transfer. In one embodiment, the heat dissipation component can also be the housing of the illumination assembly. 
         [0023]    In our preferred embodiment, the electricity is delivered to an electrical connector, not shown in the drawings, on the heat dissipation component  105  and eventually to the connector  104  on the LED lamp  103  via connector  107  that is located on the cap  108 . The locations of connectors on the heat dissipation component  105  and LED lamp  103  are configured in a way that the fastening of LED lamp  103  onto the heat dissipation component  105  can enforce the connectivity of the electrical connectors. The assembled units  106  and  103  may be attached to the main body of the medical instrument or medical device  13  via a mechanical attachment design using a set of at least two screw holes  113  and a set of at least two hand-turning screws  110 . The LED lamp  103  and main heat sink element  105  are attached via attachment element  112 , including but not limited to screws that can be turned by hand. In our preferred embodiment, the LED lamp  103  has a hole with screw groove, on the other side of the LED  102 , that matches the screw  112  so the LED lamp  103  will be compressed to the surface of the heat dissipation component  105  to reduce the heat impedance between the surfaces of LED lamp  103  and heat dissipation component  105 . In our preferred embodiment, such screw  112  can be turned with hand and the electrical connector  104  on the LED lamp will connect to the electrical connector  107  on the heat dissipation component about the same time. 
         [0024]    In one embodiment, thermal pad,  114 , may be inserted between the surfaces of the LED lamp  103  and the heat sink element  105 . In other embodiment, thermal pad,  114  may be omitted between the surfaces of the LED lamp  103  and the heat sink element  105 . 
         [0025]    In operation, light emitting diode (LED) controller  14  may control LED array  102 . In one embodiment, the LED controller  14  may control the LED array to emit light at different intensity. In another embodiment, the LED controller  14  may control the LED array to emit light at different color temperature and at different intensity. 
         [0026]    There are numerous variations in the embodiments. Example of these variations include but not limited to, LED lamp  103  may have one or more LEDs; LED array  102  and LED module  103  may have LED of different colors. The patterns of the multiple LED array  102  include but not limited to the LED patterns with no LED element or elements in the center of the pattern. There may be one set of LEDs for emitting a relatively low first light level on LED array  102  or LED module  103 , and another set of LEDs for emitting at high light levels. There may be light filters or color filter on the projection axis for changing the spectrum property of the light emitted from illumination assembly  2 ; the light pattern may change with the light level emitted by the LED light pattern generator using neutral density filters. 
         [0027]    Although the embodiment of the invention has been illustrated and that the form has been described, it is readily apparent to those skilled in the art that various modifications may be made therein without departing from the spirit of the invention.