COAXIAL VENAL CANNULA

摘要

A dual lumen cannula includes a first tube defining a return lumen and having a proximal end, a mid-portion and a distal end, wherein the distal end includes a return aperture. A second tube is coaxial with the first tube and has a proximal end and a distal end, wherein the distal end of the second tube is fixedly attached to the mid-portion of the first tube and wherein the distal end of the second tube includes a drainage aperture. A drainage lumen is defined by a space between the first tube and the second tube. A connector is attached to the proximal end of the second tube. The connector includes a reservoir for receiving a fluid from the proximal end of the second tube. The first tube extends through the connector and does not attach directly with the second tube at the connector, and the first tube remains substantially coaxial with the second tube throughout a length of the second tube.

主权项

1. A dual lumen cannula assembly, comprising:
an infusion tube defining a return lumen and having a first outer circumference, a proximal end, and a distal end that includes a return aperture, at least a portion of said infusion tube includes a wall having a reinforcing coil.; a drainage tube co-axially aligned with said infusion tube and having a second outer circumference, a proximal end and a distal end, wherein said distal end of said drainage tube includes a drainage site having a drainage aperture, and wherein a length of said drainage tube is less than a length of said infusion tube, wherein:
said drainage site includes a drainage member having first and second ends,said first end is attached to said distal end of said drainage tube, andsaid second end is attached to the first outer circumference of said infusion tube; a drainage lumen defined by a space between said infusion tube and said drainage tube; and a connector attached to said proximal end of said drainage tube and comprising a reservoir for receiving fluid from said proximal end of said drainage tube and a return opening that is attached to said proximal end of said infusion tube, wherein:
said infusion tube extends through said connector and does not attach with said drainage tube at said connector, andsaid infusion tube remains substantially coaxial with said drainage tube throughout the length of said drainage tube.