A class of introducers is comprised of a plurality of straight sections and at least two curved sections with a predetermined sense of curvature preceded, separated and followed by the straight sections, which introducer is adapted by its shape to access the septal wall or apex of a heart. One of the plurality of straight sections is a distal- most straight section. The straight and curved sections define a predetermined three dimensional shape by means of the distal straight section lying out of plane with respect to the remaining curved and straight sections.
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