Device for laser thermal ablation with a helically shaped diffuser and equipment comprising said device

An apparatus for laser thermal ablation comprising:

• a device comprising an outer tubular structure, an inner tubular structure and a light guide, the outer tubular structure having a closed terminal end, the inner tubular structure being positioned in the outer tubular structure and the inner tubular structure having a side wall with a terminal end and the inner tubular structure defining an inner volume, wherein a first coolant circulation gap is formed between the outer tubular structure and the inner tubular structure, the light guide being housed in the inner volume of the inner tubular structure, the light guide comprising an optical fiber and a diffuser optically coupled to a distal end of the optical fiber, wherein the diffuser is at least partially made of a material diffusing to electromagnetic radiation conveyed by the optical fiber, and the diffuser has a body, the body having at least one portion with a curved shape having a curved axis, the at least one portion comprising the material diffusing the electromagnetic radiation conveyed by the optical fiber;
• a laser source;
• a cooling circuit;
• a control unit.