Magnetically-driven reciprocating intravascular blood pump

A method comprising:

• delivering, to a location in a cardiovascular system of a subject, a mechanical circulatory assist device while a stent and a coiled wire of the mechanical circulatory assist device are in a radially-compressed configuration and a reciprocating valve of the mechanical circulatory assist device is in a radially-compressed configuration,
• wherein the coiled wire is wound around the stent inside, outside, or partially inside and partially outside the stent,
• wherein the coiled wire is shaped so as to define a plurality of wire turns, and wherein all of the wire turns encircle a same, single central longitudinal axis of the stent when the stent and the coiled wire are in the radially-expanded configuration of the stent and the coiled wire, and
• wherein the plurality of wire turns of the coiled wire are configured to generate a magnetic field when current flows through the coiled wire when the stent and the coiled wire are in a radially-expanded configuration of the stent and the coiled wire;
• and
• transitioning (a) the stent and the coiled wire to the radially-expanded configuration of the stent and the coiled wire, and (b) the reciprocating valve to a radially-expanded configuration of the reciprocating valve,
• wherein the reciprocating valve includes (i) a housing;
• (ii) one or more leaflets, coupled to the housing;
• and (iii) one or more permanent magnets, which are coupled to the housing, and are arranged to interact with the magnetic field generated by the plurality of wire turns of the coiled wire, so as to axially move the reciprocating valve with respect to the stent when the reciprocating valve is in the radially-expanded configuration of the reciprocating valve disposed within the stent when the stent and the coiled wire are in the radially-expanded configuration of the stent and the coiled wire, and
• wherein the reciprocating valve is configured such that:
• upstream axial motion of the reciprocating valve causes the one or more leaflets to be in an open state in which the one or more leaflets allow blood flow through the reciprocating valve, and
• downstream axial motion of the reciprocating valve causes the one or more leaflets to be in a closed state in which the one or more leaflets inhibit blood flow through the reciprocating valve.