Precurved, dual curve cardiac introducer sheath

A cardiac introducer sheath assembly comprising:

• an inner cardiac introducer sheath comprising:
• an elongate, hollow body comprising a main portion and a tip portion;
• the tip portion comprising, in order, first, second, third and fourth segments, the first segment extending from the main portion;
• the first, second, and third segments lying in a first plane;
• the first segment having a length of about 70 cm to 90 cm:
• the second segment defining an arc extending along a first, arc angle of about 70.degree. to 90.degree.;
• the third segment having a length of about 4 cm to 6 cm:
• the fourth segment lying in a second plane, the second plane oriented at a second angle of about .+-.10.degree. to .+-.170.degree. to the first plane;
• and
• the fourth segment defining an arc extending along a third, arc angle of about 40.degree. to 90.degree.;
• and
• an outer cardiac introducer sheath comprising an elongate, hollow outer body, containing said inner cardiac introducer, including an outer tip portion and an outer main portion, the outer tip portion being a remotely radially deflectable outer tip portion.