| 主权项 |
1. An intravascular blood pump system, comprising:
an intravascular blood pump adapted to be guided to a predetermined location within the circulatory system of a patient by a guide wire and the intravascular blood pump configured to provide left-heart support, the intravascular blood pump comprising a rotor having a rotor hub tapering in the distal direction, at least one blade extending radially outward from the rotor hub; a cannula coupled to a distal end of the intravascular blood pump, one or more first ports and one or more second ports establishing fluid communication between a lumen of the cannula and an exterior region of the cannula, wherein at least one first port is located in proximity to the rotor and at least one second port is spaced apart from and located distal to the at least one first port, and wherein the intravascular blood pump is configured to draw blood from the patient's heart into the at least one second port through the cannula lumen and out the at least one first port to provide left-heart support while the cannula is positioned across an aortic valve of the patient, the cannula is configured such that when the intravascular blood pump is positioned in the patient to provide left-heart support the distal end of the cannula and the at least one second port are positioned inside the patient's heart and the proximal end of the cannula and the at least one first port are positioned in the patient's aorta; a catheter connected to a proximal end of the intravascular blood pump, a purge lumen extending through the catheter and operatively arranged to deliver purge fluid towards the intravascular blood pump; an elongate lumen arranged coaxially with at least a portion of the cannula and in series longitudinally with the cannula, and an end of the elongate lumen is adjacent an end of the cannula, the elongate lumen sized to slidably receive the guide wire and having a diameter sized smaller than a diameter of the cannula lumen; a pressure sensing element configured to sense pressure proximate the intravascular blood pump; a housing connected to a proximal end of the catheter; and first and second conduits each connected to the housing, at least one of the first conduit and second conduit in fluid communication with the purge lumen. |
