COAXIAL VENAL CANNULA
First Claim
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;
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 the length of said drainage tube is less than the length of said infusion tube;
a drainage lumen defined by a space between said infusion tube and said drainage tube;
a connector attached to said proximal end of said drainage tube and having a reservoir for receiving fluid from said proximal end of said drainage tube, wherein said infusion tube extends through said connector and does not attach with said drainage tube at said connector, and further wherein said infusion tube remains substantially coaxial with said drainage tube throughout the length of said drainage tube.
7 Assignments
0 Petitions
Accused Products
Abstract
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 includes a drainage aperture. A drainage lumen is defined by the 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 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 the length of the second tube.
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Citations
23 Claims
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1. A dual lumen cannula assembly comprising:
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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; 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 the length of said drainage tube is less than the length of said infusion tube; a drainage lumen defined by a space between said infusion tube and said drainage tube; a connector attached to said proximal end of said drainage tube and having a reservoir for receiving fluid from said proximal end of said drainage tube, wherein said infusion tube extends through said connector and does not attach with said drainage tube at said connector, and further wherein said infusion tube remains substantially coaxial with said drainage tube throughout the length of said drainage tube. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19)
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16. In a dual lumen cannula assembly having an infusion tube with a distal end and a
proximal end, and a drainage tube with a distal end and a proximal end, wherein the drainage tube is co-axially aligned with the infusion tube, the improvement comprising: -
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 the outside 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 the outside circumference of said first small tube between said proximal and distal ends of said small tube, said drainage member including at least one drainage aperture; a return aperture disposed adjacent to said distal end of said infusion tube.
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20. A method of making a cannula assembly, comprising:
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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 return 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 return tube; and installing an infusion site having at least one infusion aperture at said distal end of said elongate infusion tube. - View Dependent Claims (21, 22, 23)
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Specification