Apparatus for medical treatment of tissue by means of laser light

An apparatus for medical treatment by means of laser light, made by the following process steps:

• providing an optical conducting fiber comprising a core, a cladding arranged above the core for conducting laser light coupled into the optical conducting fiber, and capillaries arranged in the cladding, said capillaries running in a longitudinal direction of the optical conducting fiber at a radial distance from a longitudinal axis of the optical conducting fiber and forming at least one capillary ring when viewed in cross-section, wherein said capillaries have cavities which are separated by bridges, said bridges having a width which is smaller than a wavelength of the laser light;
• melting the capillaries shut at a light emission end of the optical conducting fiber thereby generating a light-emitting melt shut end of the capillaries;
• and
• bending the optical conducting fiber at the light emission end thereby forming a curved light emission end of the optical conducting fiber, wherein the laser light emerges from a forward surface of the curved light emission end, and wherein the laser light is transmitted in a direction which runs transverse to a substantially straight longitudinal section located directly in front of a curvature of the curved light emission end.