Double-lumen catheter

Details Double-lumen catheter Double-lumen catheter

A - Human Necessities

61

F

128/127

A61F 7/00 (2006.01) A61M 5/158 (2006.01) A61M 25/00 (2006.01)

Patent

CA 1111733

ABSTRACT OF THE DISCLOSURE A double lumen catheter for use in haemodialysis, which comprises ducts for blood streams flowing into and respectively out of the body, an inner cannula providing an inner duct, an outer cannula surrounding the inner cannula and providing between the inner cannula and the outer cannula an outer duct, a front end of at least the inner cannula being inclined obliquely to the longitudinal cannula axis and sharply ground to facilitate puncture of a blood vessel, the front end of the inner cannula projecting be- yond a front end of the outer cannula and the cross-section of the catheter changing progressively from the outer diameter of the inner cannula to the outer diameter of the outer cannula, the outer duct when in an operative state having at its front end an opening of cross-sectional area equal to the cross-sectional area of the outer duct, so that the total cross-section of the outer duct is available to a blood stream entering or leaving the outer duct.

292644

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