Dual lumen sheath for arterial access

A sheath assembly for insertion of a percutaneous pump, the sheath assembly comprising:

• a tubular sheath body dimensioned for insertion into a blood vessel through a vessel aperture and comprising:
• a wall having a proximal end portion, a distal end portion, a longitudinal axis, an outer surface, and an inner surface defining a first lumen substantially parallel to the longitudinal axis, wherein the first lumen is dimensioned to allow passage of a portion of the percutaneous pump;
• and
• a second lumen disposed within the wall between the inner surface and the outer surface and extending from the proximal end portion of the wall to the distal end portion of the wall, wherein the second lumen is dimensioned for passage of a guidewire;
• a stylet comprising a proximal end and a distal end;
• and
• a hub coupled to the tubular sheath body, wherein the hub comprises:
• a first port in fluid communication with the first lumen;
• and
• a second port in fluid communication with the second lumen, wherein the second port is configured to secure the proximal end of the stylet,
• wherein when the proximal end of the stylet is secured to the second port, the proximal end of the stylet forms a liquid tight seal across the second port.