Cannula
First Claim
1. An aortic cannula for supplying blood to the aorta during heart surgery, comprising:
- an elongated tube having a longitudinal axis and a terminal end with an opening therein;
a ramped surface adjacent the terminal end to direct the flow of blood from the cannula in a direction approximately 70°
-90°
to the longitudinal axis,and the terminal end including a substantially flat lip extending from the ramped surface and beyond the perimeter of the tube.
1 Assignment
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Accused Products
Abstract
An improved aortic cannula is provided for use in heart bypass surgery. The cannula includes an elongated tube with a terminal end. The terminal end has a ramped surface leading to the discharge opening, with a lip extending approximately 70°-90° to the longitudinal axis of the cannula at the bottom of the discharge opening. The curved surface and lip cause the blood to exit the cannula opening in a direction approximately 70°-90° from the longitudinal axis of the cannula, and in a direction toward the ascending aorta. With the improved cannula of the present invention, no blood is directed towards the aortic arch, thereby minimizing the risk of stroke from dislodged plaque commonly found in the aortic arch. The curved surface of the terminal end also reduces the blood flow turbulence, thereby decreasing pressure requirements. The width of the opening allows blood to be discharged in a broadcast band with a radius of approximately 90°.
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Citations
25 Claims
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1. An aortic cannula for supplying blood to the aorta during heart surgery, comprising:
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an elongated tube having a longitudinal axis and a terminal end with an opening therein; a ramped surface adjacent the terminal end to direct the flow of blood from the cannula in a direction approximately 70°
-90°
to the longitudinal axis,and the terminal end including a substantially flat lip extending from the ramped surface and beyond the perimeter of the tube. - View Dependent Claims (2, 3, 4, 5, 6, 14, 15, 16, 17, 18)
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7. An improved aortic cannula for supplying blood to the aorta during open heart surgery, comprising:
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an elongated tube having a longitudinal axis and a terminal end with an opening therein; and wherein the opening having a curved perimeter edge and a substantial width so as to produce a fanned broadcast of blood from the opening. - View Dependent Claims (8, 9, 10, 11, 12, 13, 19, 20)
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21. A method of minimizing stroke or embolism in a patient during open heart surgery, comprising:
- making an opening in the aorta;
inserting a cannula through the opening, the cannula having a terminal end with an opening therein through which blood is discharged; orienting the cannula opening so as to be directed toward the ascending aorta, thereby precluding blood flow from the cannula in a direction toward the aortic arch. - View Dependent Claims (22, 23, 24, 25)
- making an opening in the aorta;
Specification