Coaxial venal cannula

A dual lumen cannula assembly, comprising:

• an infusion tube with a distal end and a proximal end,
• a drainage tube with a distal end and a proximal end, wherein the drainage tube is co-axially aligned with the infusion tube;
• a connector having a reservoir, a connector aperture that is fluidly connected to a mouth on a proximal end of said drainage tube, and a return opening on said connector, wherein an outer circumference of said infusion tube is attached to said return opening;
• a drainage member connected to said distal end of said drainage tube and further connected to an outer circumference of said infusion tube between said proximal and distal ends of said infusion tube, said drainage member including at least one drainage aperture;
• and
• a return aperture disposed adjacent to said distal end of said infusion tube.

A method of making a cannula assembly, the method comprising:

• forming an elongate flexible infusion tube having a proximal end and a distal end;
• forming an elongate flexible drainage tube having a proximal end and a distal end;
• forming a connector having a return opening, and a connector aperture;
• inserting said elongate infusion tube into said return opening and out said connector aperture;
• attaching said infusion tube to said return opening of said connector;
• connecting a distal end of said elongate drainage tube to a mid-portion of said elongate infusion tube;
• installing a drainage site having at least one drainage aperture at said distal end of said elongate drainage tube;
• and
• installing an infusion site having at least one infusion aperture at said distal end of said elongate infusion tube.