Medical delivery device construction

An elongate medical delivery device comprising:

• an outer sidewall extending from a proximal end thereof to a distal end thereof and 360 degrees about a longitudinal axis of the device, the outer sidewall including an inner surface, the inner surface defining a plurality of longitudinally extending inward protruding members of the outer sidewall, each of the plurality of inward protruding members being spaced apart from one another about the longitudinal axis;
• an inner sidewall extending within the outer sidewall between the proximal and distal ends thereof and extending from a first end of the inner sidewall to a second end of the inner sidewall less than 360 degrees about the longitudinal axis of the device, the inner sidewall including an outer surface and an inner surface, the outer surface of the inner sidewall defining a plurality of longitudinally extending grooves of the inner sidewall, each of the plurality of grooves spaced apart from one another about the longitudinal axis and interlocking with a corresponding inward protruding member of the plurality of longitudinally extending inward protruding members of the outer sidewall;
• and
• a longitudinally extending lumen defined by the inner surface of the inner sidewall and a portion of the inner surface of the outer sidewall that extends between the first and second ends of the inner sidewall, the lumen extending from a first opening in proximity to the proximal end of the outer sidewall to a second opening in proximity to the distal end of the outer sidewall.