| abstract |
The catheter (130) is provided with one or two needle shafts (470,472) , which may be located within respective sheaths that extend axially along the interior of the lumen of a main catheter shaft. Each needle shaft carries, at a distal end thereof a penetrable element (310,312) or 'needle' that is normally retracted within the distal tip of the main shaft , but is subsequently deployed to extend the needles into the organ's wall. Each extended needle is curved to relative to the shaft's axis to enter the organ wall in a flattened trajectory that both reduces the chance of puncture through the wall and anchors the needles into the wall during injection (for reduced chance of pullout under pressure) . The needles are typically arranged to exit the ti at contralateral orientations relative to each other. |