the intravenous treatment device comprises a delivery system (1, 2) of at least one treatment dose, with such a delivery system (1; 2) comprising a treatment dose delivery thread (1) which is flexible, such as, for example, an optical fiber with a distal end (10) that can be inserted at least part of its length longitudinally into a vein, allowing at least one treatment dose to be delivered to the vein in the region of the vein. end of such distal end (10). the device further comprises a drive system (4) which enables the dose delivery wire element (1) to be actuated in at least a given first drive direction (r), and a guide (3) which is flexible throughout its length or part thereof, which allows to guide the wire element (1) in part of its length, with an extreme proximal part (11) and, opposite to it, an extreme distal part (10) of the wire element (1), which is not are guided by the guide (3). the device comprises a support system (5) which allows the distal end (30) of the guide (3) to be temporarily held in relation to a patient's body near the insertion zone (7) of the wire element (1), and locking means (6), allowing axially locking the extreme proximal part (31) of the guide (3), at least in the driving direction (r) of the wire element (1).
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