Patent ID: 8486123

Claim:
An arrangement for reducing microorganisms, comprising: an irradiation device, which comprises a light source and a first connector body; a rotationally symmetric locking body having a first recess within which is positioned the light source, having a second recess within which is positioned a locking disk, and having a wall separating the light source and the locking disk, the wall having an opening through which light from the light source passes; and at least one applicator; wherein the locking disk is eccentrically positioned within the second recess by a wire spring to block light from exiting the opening; wherein the wire spring is mounted within a groove of the locking member in the second recess; wherein the locking disk has a conical surface with an opening at an apex of the conical surface; wherein the applicator comprises a light guide surrounded by a protective jacket and a second connector body, by means of which the applicator is detachably connected to the irradiation device via the first connector body thereof; wherein the first connector body and the second connector body correspond to each other and interlock with one another in such a way that the light of the light source can be irradiated through the light guide to a therapy site, onto which a light-activatable substance has been applied for therapeutic purposes; wherein upon insertion of said applicator the light guide is guided by the conical surface into the opening at the apex biasing the locking disk into an alignment of the wall opening and the locking disk opening; wherein for therapy of a region of the oral cavity, the light guide has a numerical aperture greater than 0.5 and one end free of the protective jacket, wherein the light beam emanating from the light guide diverges, the dimensions of the applicator are specified so that it can be introduced into the oral cavity without difficulty and configured as a pocket probe having a pointed conical tip or as a flat probe; wherein the irradiation device comprises a housing tube and a head part situated at the front end thereof, which is configured as the first connector body; wherein the light source and an electronic circuit board having an externally actuatable button are located in the front part of the housing tube; and wherein batteries or rechargeable batteries for supplying the electronic units for the light source with power are further provided in the housing tube, with a cap being detachably connected to the rear end of the housing tube via a threaded joint.