| 摘要 |
A directivity characteristic modification device, e.g. an acoustic lens (22), is mounted on a flexible ultrasonically marked catheter (1) provided with electrodes (24, 25) of the transducer (21). Electrical conductors (3 and 4), bonded to the electrodes (24, 25) of the transducer (21) are longitudinally positioned in the catheter and are linked at the proximal end with connectors (5 and 6). By changing the shape and building material of the lens (22), one can chose directivity characteritic of the whole assembly (21-22). This device is indwelled into the patient's body and connected to an outside transponder and serves for unambiguous localisation of the marked location on the catheter using an outside ultrasound scanner. |
