Appeal No. 2000-0908
Application No. 08/763,728
aortic cannula comprising an elongated tube having a terminal
end with forward and rearward surfaces, at least one opening
in the rearward surface, the forward surface being closed “to
prevent blood flow in the direction of the aortic arch,” and
an inverted cup at the terminal end for deflecting the flow of
blood exiting the cannula rearwardly.
Fecht discloses an aortic cannula comprising an elongated
tube having a tip, shown in the cross section in Figure 7,
comprising a generally elliptical opening 65 provided in a
sidewall of the tip. The tip also includes a smoothly curved
wall 74 extending between the inner wall of the cannula and
the distal end of the opening so that blood flowing distally
in lumen 70 flows into the tip, against the smoothly curved
wall, and out the opening 65 with minimal turbulence even
though there is a substantial change in the direction of the
blood flow. Column 3, line 64 through column 4, line 5.
Cosgrove is directed to an aortic cannula designed to
overcome the problems associated with high velocity “jet” flow
emanating from the distal end of an aortic cannula. As
explained by Cosgrove at column 1, lines 23-36, the high
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