A catheter is provided with: a first structure having an elongated catheter body which has at least one lumen, and also having a first connection section which is provided on the proximal end side of the catheter body a second structure having a second connection section which is connectable to the first connection section on the distal end side of the first connection section and a third structure having an inner tube which has an elongated imaging core passed therethrough, the imaging core having an image intake section which takes in an image and extending into the catheter body, the third structure further having a third connection section which is provided on the proximal end side of the inner tube and which is connectable to the first connection section on the proximal end side of the first connection section. The catheter is further provided with: a first prevention section which, in a first connection state in which the first connection section and the second connection section are connected, prevents the connection between the first connection section and the third connection section and a second prevention section which, in a second connection state in which the first connection section and the third connection section are connected, prevents the connection between the first connection section and the second connection section.La présente invention concerne un cathéter comprenant : une première structure ayant un corps de cathéter allongé qui présente au moins une lumière, et ayant également une première section de raccordement qui est disposée du côté de lextrémité proximale du corps de cathéter une deuxième structure ayant une deuxième section de raccordement qui peut être raccordée à la première section de raccordement du côté de lextrémité distale de la première section de raccordement et une troisième structure ayant un tube interne à travers lequel passe un noyau dimagerie allongé, ledit noyau dimagerie ayant une section de prise dimage qui prend u
