US 2798938 A
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Description (OCR text may contain errors)
R. L. JEWELL SURGiCAL. LIGHT July 9, 1957 Filed Sept. 17, 1954 United States. Patent T" SURGICAL LIGHT Raymond L. Jewell, Erie, Pa., assignor to American Sterilizer Company, Erie, Pa., a corporation of Pennsylvania Application September 17, 1954, Serial No. 456,770
1 Claim. (Cl. 2401.4)
This invention is intended to provide a surgical light which the surgeon can adjust during the course of an operation without substantially blocking the illumination and without risk of contamination. In a preferred form, direct illumination from the light source is blocked off and most of the light comes from a reflector surround: ing the light source which reflects the light in bands converging along the axis of the reflector which intersect at the operating field thus eliminating shadows because the light comes in angularly from all sides. In this form there is a cone directly beneath the light source in which there is little or no illumination. To provide for adjustability, the light source has at its center a handle depending along the axis of the reflector which the surgeon may grasp to move the reflector in any direction so as to get the desired illumination. The location of the handle has a minimum effect upon the illumination because it is within the light free cone. The handle is located the maximum distance from the reflector so that the risk of contamination by contact with the reflector or any other part of the light is kept to a minimum. The handle can be easily removed for sterilization and weighs so little that removal of the handle does not cause the light to change its position.
In the accompanying drawing,.Fig. 1 is a diagrammatic view of a surgical light, Fig. 2 is a section through the reflector, and Fig. 3 is an enlarged section through the lower end of the light source and the depending adjusting handle.
In the drawing there is shown a ceiling suspended light having a track 1 for a carriage 2 having a depending suspension tube 3 at the lower end of which is a light supporting arm 4 with a counterbalance weight 5. The arm is mounted at the lower end of the tube 3 for rotation on its axis and for pivotal movement about horizontal and vertical axes. A common structure for this mounting may be effected by a bushing 4a rotatable on the lower end of vertical tube 3 and having at its lower end horizontal bearings for trunnions 4b on a bushing 4c in which the arm 4 is journaled. At one end of the arm is a yoke 6 having a trunnion support 7 for a reflector 8. By means of a handle 9, the reflector can be moved in vertical, horizontal and angular directions. There is also provided a yoke 10 connected to arms 11 fixed to the reflector by means of which the reflector may be pivoted about its trunnion axis by back and forth translation of the yoke 10. The parts so far described are or may be of common construction and may dilfer substantially from those illustrated.
Within the reflector is a source of illumination having a globe 12 for an incandescent light bulb 13. The bottom walls 14 of the globe are treated to block direct illumination from the lamp bulb along the axis of the reflector 8. The side walls of the globe 12 are transparent and transmit light laterally or radially within the space between lines 15 and 16 to the reflector from which the light is reflected in bands or beams between lines 15a 2,798,938 Patented July 9, 1957 we Y and 16a converging and intersecting on a field 17 on the axis of the reflector. At the field 17 shadows are minimized because the light comes in angularly on all sides. It will be noted that there is a cone between the lines 15a beneath the bottom of the globe 12 in which there is no illumination because any direct transmission of light from the-bulb 13 is blocked. Accordingly, any parts placed in this cone would not interfere with the illumination on the field 17.
At the bottom of the globe 12 there are inner and outer plates 18 and 19 which are clamped against the globe by a bolt 20 extending through a hole 21 in the bottom wall of the globe. Suitable gaskets 22 and 23 are arranged between the plates and the inner and outer surfaces 24 and 25. Integral with the outer or bottom plate 19 is a depending projection or stud 26 on which is threaded a hollow cup shaped handle 27 which extends substantially to the plane of the rim of the reflector. The handle has tubular side walls and a closed bottom wall 28 so that when the handle is in place the entire lower end of the studlike projection 26 is enclosed. At the upper end of the handle is an outwardly extending flange 29 which butts against spaced projections 30 of insulating material when the handle is screwed in place and provides an air space between the flange 29 and the bottom plate 19. The purpose of this air space is to keep the handle from getting too hot. It will be noted that when the handle is in place, it depends within the light free cone between the lower end of the globe. Accordingly, when the handle is grasped to change the position of the reflector and thereby change the location of the field 17 on which the illumination is directed, there is a minimum of interference with the illumination on the field. Also, the handle is located at a maximum distance from the reflector so that accidental contact with unsterilized surfaces is minimized. The flange 29 prevents accidental contact with the globe 12.. Because of the hollow construction of the handle, it is not heavy enough to interfere with the counterbalancing of the light. If the handle is removed, the light will remain in the same place. This is desirable for the handle may have to be removed during the course of an operation if it should become contaminated. The handle is made of a material which can be readily sterilized.
By having the handle located at the light source finer adjustment is possible than can be obtained by a handle 9 mounted at the other end of the arm 4. Either of the handles can be used to position the light. The possibility of adjusting the light at the source and without interfering with the illumination of the field makes possible a more precise control. The location of the control has the further advantage that contact with unsterilized surfaces is minimized since the handle which is in the most prominent position is completely sterilized and the other parts such as the rim of the reflector are located as far away from the handle as is possible.
What is claimed as new is:
In a surgical light of the type having means for mounting the light on a support above and spaced from the field to be'illuminated and for free universal movement, said light being counterbalanced to remain in any posi tion to which it is moved, said light having a hollow structure with a depending rim of diameter substantially larger than the field to be illuminated surrounding and radially outward of an axis normal to said field and including a light source above the plane of the rim designed to transmit light in beams converging toward said axis and intersecting at said field, the combination of a stud fixed to said structure below said light source and depending therefrom along said axis, a hollow cup shaped sterilizable handle fitting over and enclosing said stud,
said handle having a continuous surface tolfacilitate sterilizationwith a closed bottom wall extending substantially to the plane of said rim and having upwardly extending tubular side walls providing a hand grip portion below said lightsource projecting prominent1y to ward saidgfield, and means inside the handle for rernovably fastening the handle on the stud,'thehand .grip portion of the handle extending along said axis remote from said surrounding structure ofthe light and said handle having integral therewith an outwardly flaring guard flange at the upper end of said tubular sidewalls to prevent contact with unsterilized surfaces of said structure upon grasping the handle to adjust the light,
References Cited in the file of this patenb- UNITED STATES PATENTS Casinello June 1940 Collins Sept. 24, 1940 Alexander Dec. 24, 1940 Kolbert et al Aug. 22, 1944 FOREIGN PATENTS weden urns-Jun,- p 7, 19 8 France Mar. 17, 1954