Disclosed is an interventional medical catheter and a three-dimensional mapping device applying same, comprising an insert tube (1), at least two sensing elements (2), several electrodes (3) and a catheter handle (4). The insert tube (1) comprises a catheter body (7) having a linear shape and an annular shaped helical structure (8) coupled with the head end of the catheter body. The several electrodes (3) are located on the annular shaped helical structure (8). At least two sensing elements (2) are both located on the annular shaped helical structure (8), or at least one is located on the catheter body (7) and at least one of the others is located on the annular shaped helical structure (8). One end of the catheter handle (4) is secured with the tail end of the catheter body (7) and the other end is provided with a connector (5). Since the sensing elements can detect the three-dimensional coordinates and the direction of the magnetic field therein, the position and morphology of the annular shaped helical structure can be calculated. The image morphology of the catheter can be conveniently reproduced by utilizing existing three-dimensional image processing software technology therefore, the positioning and the shape of the annular shaped helical structure can be reproduced.La présente invention se rapporte à un cathéter médical dintervention et un dispositif de mise en correspondance tridimensionnelle et son application correspondante, comprenant un tube dinsertion (1), au moins deux éléments de détection (2), plusieurs électrodes (3) et un manche de cathéter (4). Le tube dinsertion (1) comprend un corps de cathéter (7) ayant une forme linéaire et une structure hélicoïdale (8) en forme annulaire couplé avec lextrémité de la tête du corps de cathéter. Les électrodes (3) en forme annulaire sont situées sur la structure hélicoïdale (8). Au moins deux éléments de détection (2) sont tous deux situés sur la structure hélicoïdale en forme annulaire, (8) ou au moins lun den
