| 主权项 |
1. A pump for inducing flow within a vascular system, the pump comprising:
a cannula having a first configuration for deployment within the vascular system and a second configuration for directing the fluid flow within the vascular system, the second configuration having a greater diameter than the first configuration, the cannula comprising a frame member that, when in the second configuration, extends axially and radially in proximal and distal diameter transition portions of the cannula and axially in a mid-portion of the cannula between the diameter transition portions, wherein the frame member comprises a longitudinal pattern in the mid portion or the diameter transition portions and comprises a different pattern comprising a helical or mesh pattern in the other; and an impeller configured to induce the fluid flow through the cannula by rotation about an axis, the impeller having a blade angle that transitions between generally perpendicular to the axis of rotation and generally parallel to the axis of rotation, the impeller further having a first radius in the first configuration and a second radius in the second configuration, the second radius greater than the first radius. |
