| 摘要 |
In one embodiment of the present invention, a cannula for use with a blood circulation device may include the cannula proximal and distal directions along a longitudinal axis. The cannula includes a proximal portion having a wall extending around the longitudinal axis, having outer and inner faces, the inner face defining a bore, the proximal portion having dimensions transverse to the longitudinal axis, and the dimensions being constant in the proximal and distal directions. The cannula has a distal portion having an outer face, continuous with the outer face of the proximal portion. The outer face of the distal portion extends around and along the longitudinal axis, and the outer face of the distal portion tapers distally toward the longitudinal axis. The distal portion may include at least two openings extending from the outer face of the distal portion, which may merge with one another within the distal portion. |
