The device for laser thermal ablation comprises: - an outer tubular structure (21) having a closed terminal end - an inner tubular structure (23), positioned in the outer tubular structure (21) and having a side wall with a terminal end and defining an inner volume, configured to receive a light guide (27) A first gap (25) for circulation of a coolant formed between the outer tubular structure (21) and the inner tubular structure (23). The side wall of the inner tubular structure (23) comprises at least one lateral opening (31) that places the first gap (25) in fluid communication with the inner volume of the inner tubular structure (23).
