Frame with inner lining

A method, comprising:

• deploying a left-ventricular assist device within a body of a subject by:
• placing a tube of the left-ventricular assist device such that the tube traverses an aortic valve of a subject, such that a proximal end of the tube is disposed within an aorta of the subject and a distal end of the tube is disposed within a left ventricle of the subject,
• a frame being disposed within at least a portion of the tube, the frame defining a plurality of cells, and the frame being configured such that, in a non-radially-constrained configuration of the frame, the frame comprises a generally cylindrical portion, a width of each of the cells within the cylindrical portion, as measured around a circumference of the cylindrical portion, being less than 2 mm, and
• an inner lining lining at least some of the cylindrical portion of the frame;
• and
• operating an impeller to rotate within the frame such as to pump blood from the left ventricle to the aorta.