A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
128/81
A61M 5/00 (2006.01) A61M 5/158 (2006.01) A61M 25/00 (2006.01)
Patent
CA 1150122
McCARTHY & McCARTHY C A N A D A ABSTRACT OF THE DISCLOSURE A dual lumen cannula for use in haemodialysis by inserting the cannula into the subclavian vein of a patient to contemporaneously remove blood from the vein for treatment and to return treated blood to the vein downstream from the point of removal. The cannula includes inner and outer lumens and blood is withdrawn through the space between the lumens. Treated blood is returned to the inner lumen. The outer lumen is shaped to have a curvature similar to that of the portion of the vein receiving the cannula and is sufficiently flexible to be straightened during insertion without damage or kinking. The outer lumen has a tapered distal end portion which fits snugly about a part of the inner lumen and defines openings adjacent this end portion to withdraw blood from the vein. Similarly the inner lumen defines openings in a portion outside the outer lumen for returning blood down- stream from the point of removal of the blood. The inner lumen can be withdrawn between haemodialysis treatments leaving only the outer lumen in position and heparinized physiological saline solution can be injected into the outer lumen to prevent blood clotting. If desired, the inner lumen may be left in place between treatments and both inner and outer lumens kept patent with heparinization.
350001
Mccarthy Tetrault Llp
Vas-Cath Of Canada Limited
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