Lighting device for surgical and medical uses

Claim 1

A directable light device, said device comprising: A. a halogen lamp assembly including a bulb, base support means for the bulb, said means serving to hold the bulb and extend it axially in a first direction, said bulb means further providing means extending in a second direction to provide electrical powering connections to illuminate the bulb, and a concave partially spherical dichroic coated reflector disposed co-axially about the bulb to reflect illumination provided by the bulb in said first direction, said reflector terminating outwardly in an annular dichroic band capped by an outwarldy flanged rim having a first outside diameter; B. a housing, said housing having a front panel and a back panel defining a space between the panels, said front panel of the housing having a circular opening of a second diameter greater than the first diameter; C. means for mounting said lamp assembly in said opening in the front panel of said housing, said means comprising: (i) a first circular portion of a third diameter, said third diameter being slightly less than said second diameter but greater than the first diameter, whereby said first circular portion is insertable through said opening; and flange means extending radially outwardly from said first circular portion, thereby to enable said first circular portion to be supported by the front panel of the housing when said first circular portion is inserted through said opening and said flange means is pressed against the front panel, the area of the front panel of the housing defining said circular opening having at least one recess extending radially outwardly, and said first circular portion having a projection extendable in the direction of said recess to pass therethrough and behind the front panel, so that, upon partial rotation of said first circular portion, said first circular portion is removably secured in engagement with the front panel of the housing; (ii) A second circular portion of a fourth and outer diameter less than the third diameter, but greater than the first diameter, said second circular portion being frusto-conical and disposed coaxially with the first portion, but spaced from and secured to said first portion by a plurality of first rigid elements extending between the first and second circular portions; and (iii) A third circular portion, said third circular portion having an outside diameter less than the fourth diameter but greater than the first diameter, said third diameter portion being disposed coaxially with the second circular portion, but spaced from and secured to said second portion by a plurality of second rigid elements, said third circular portion comprising a cylindrical sleeve section having a first end extending toward the apex of the projected cone of the frusto-conical second portion, and having an inside diameter slightly greater than the said first diameter, said sleeve portion having a second end opposite its first end, said second end having a radially inwardly extending flange of an inner diameter less than said first diameter; said sleeve having means axially inwardly of its said first end to retain said reflector and bulb when said reflector and bulb are inserted through the first end of the sleeve and pressed against its radially inwardly extending flange; the back panel of said housing having a vented area in substantial alignment with the axis of the cylindrical sleeve section; whereby heat produced by the illumination of the bulb when the light fixture is directed downwardly, will be largely dissipated by a "chimney effect" by passing through the spacings between the first and second circular portions and second and third circular portions of said means for mounting said lamp assembly, and around the sleeve section and out of the vented area in the back panel of the housing.