| 主权项 |
1. A catheter system for a catheter pump, comprising:
an elongate catheter body having a distal portion including an expandable cannula having an inlet and an outlet, the expandable cannula having a delivery profile and an operational profile larger than the delivery profile; an impeller assembly including an impeller shaft and an impeller body including one or more blades, the impeller blade(s) drawing fluid into the cannula when rotated in the fluid; a sheath having a cannula retention zone disposed over the expandable cannula and a separation zone, the cannula retention zone having a first configuration adapted to retain the expandable cannula in the delivery profile; wherein the system is adapted to separate the separation zone into a first portion and a second portion disposed across a gap, the gap enabling the elongate catheter body to pass between the first and second portion so that the sheath can be removed from the elongate catheter body. |
