The laser applicator comprises a catheter (10) having a proximal section(10a), amidsection (10b) and a distal end section (10c). It contains a light guide,the light ofwhich is output in a decoupling portion (40). The light guide runs in alongitudinalgroove on the outside of a catheter body. While the light guide (20) iscontinuous, thecatheter is composed of catheter bodies, which are joined together at acatheter splicesite (37).
