US Patent 7367967 Catheter with sheathed hypotube

A catheter assembly and method for constructing same comprises the engagement of a substantially hollow proximal tubular member, which is at least partially coated with at least one polymeric material, to a substantially distal outer tubular member. The proximal tubular member and the distal outer tubular member define at least one continuous central lumen therethrough. At least a portion of the distal outer tubular member is disposed about at least a portion of an inner tubular member. A portion of the inner tubular member is engaged to a portion of the proximal tubular member. A portion of the inner tubular member is engaged to a portion of the end region of the distal outer member. An end region of the proximal tubular member extends distally into the distal outer tubular member adjacent to the inner tubular member.