Abstract: A light guide stable to UV-B radiation having an envelope made of a flexible fluorocarbon polymer tube and a liquid light conducting core which contains an aqueous chloride salt solution, such as a calcium chloride solution, which has a pH value adjusted by added alkali, e.g. KOH, to 6 or higher.

Abstract: Illuminating equipment with a light source and a liquid light guide, which is coupled optically to the light source and the liquid core of which contains a mixture of heavy and light water in a ratio by volume of 50:50 to 98:2, depending on the length of the light guide. The light guide transfers the visible range of the spectrum in a color-neutral manner. At the same time, the long-wave radiation, which causes unwanted heating effects, is suppressed.

Abstract: A lighting device with two light pipes contains a light source with two optical systems arranged at right angles to each other and a common lamp. Behind the lamp, shifted by 9.degree., there are two reflector concave mirrors and, opposite each of them a condenser, which focuses the light arriving directly from the lamp and the light arriving from the reflector into one light pipe each. The full utilization of the light-pipe aperture requires a crowded construction, which is achieved by chamfered lateral edges of the condenser-lens mountings and the concave-mirror mountings, including cut-off lateral segments of the concave mirrors. Mirrors and lamp are contained in a replaceable module which module is inserted and fastened in the device housing, whereby the alignment of lamp and mirrors with the condensers (which are rigidly mounted in the housing) is automatically ensured.

Abstract: In an illumination device comprising a light source and a light guide consisting of a flexible tube of fluoroplastic filled with liquid the filling liquid is a phenylmethyl silicone oil.

Abstract: An irradiation device for the radiation polymerization of synthetic materials in denture parts is described, having an electric lamp as source for radiation in the short-wave visible and close ultraviolet spectral region, also having a receptacle defining an irradiation chamber for a denture part which is to be irradiated, and a concave reflector associated with the lamp to reflect the radiation of the lamp into the irradiation chamber, and the said irradiation device contains a xenon flashlight as an electric lamp which has a curved bulb which extend in two directions of a surface. The bulb of the flashlight preferably has the shape of a helix with approximately 11/2 windings and tangentially spaced straight ends. The reflector is preferably box-shaped and has an open narrow side through which the connection ends of the flashlight bulb extend. The receptacle is preferably a dish with a quadrangular cross-section made from PTFE which surrounds the denture part with a clearance.

Abstract: In a radiation coagulator having an electric incandescent lamp, in particular a tungsten-halogen low-voltage lamp, as radiation source, and a tissue contact element of a crystalline dielectric material transmissive to the radiation, forming a contact surface to be pressed against living body tissue, the temperature conductivity (reciprocal of the temperature resistance), the heat capacity of the contact element, possibly in combination with a heat sink attached thereto, is so great that the heat generated in the tissue in contact with said surface is derived in substantial measure from the tissue contact element. This prevents an over-rapid and over-intense temperature rise at the surface of the tissue, leading to a considerable improvement in coagulability, especially for severe parenchymatous hemorrhages, and to lessened adhesion to the contact surface, and permitting a gentle coagulation, extending into depth if desired.

Abstract: The apparatus, used for example to stop bleeding by heat coagulation during surgery, comprises a high power incandescent lamp emitting intense radiation high in infrared content enclosed in a housing having a light guide means, such as a solid light pipe, providing a light exit surface. The exit surface of the light guide means is provided with a self supporting stiff and non-pliable polymeric application element having a thickness of at least about 0.1 millimeters or a polymeric coating having the same thickness and physical characteristics, permanently applied to the exit surface or to a transparent end plate positioned adjacent to and protecting said exit surface. The application element or coating, respectively, is made of a polymer such as Teflon, Teflon PFA, Teflon FEP and Teflon PTFE, etc. and is substantially transparent to the radiation emitted by the lamp.

Abstract: A flexible light guide of plastic tubing is filled with a liquid which does not wet the plastic material, and preferably also is hygroscopic. The plastic material of the tube is preferably Teflon, FEP, PFA or PTFE; the liquid, for example, is an inorganic solution, especially ionic solutions and alcohols, particularly water-like polyvalent alcohols, so that light rich in ultraviolet (UV) radiation will be transmitted essentially through the solution and not deteriorate the tubing, the non-wetting characteristics providing for a sharp interface between the liquid and the tubing.

Abstract: A flexible light guide of the liquid filled type is provided with a liquid supply container outside the light guide.