Apparatus and methods are described including a left-ventricular assist device that includes a pump-outlet tube the defines a lateral wall shaped to define one or more blood-outlet openings. An impeller pumps blood of a subject proximally through the pump-outlet tube, such that the blood exits the pump-outlet tube via the blood-outlet openings. A delivery tube extends, from outside the subject’s body, through the pump-outlet tube to a distal portion of the device. An inflatable element surrounds the delivery tube proximally to the blood-outlet openings and includes a distal inflatable-element portion, which is coupled to an inside of the lateral wall, and a proximal inflatable-element portion, which is wider than the pump-outlet tube and is disposed proximally to the pump-outlet tube. Other applications are also described.