Stent delivery system with pusher assembly

A pusher assembly for a stent delivery device, the pusher assembly comprising:

• a distal end of an elongate inner member;
• and
• a stent-engaging member having a proximal end and a distal end, the proximal end of the stent-engaging member being at least partially inside the distal end of the elongate inner member, the stent-engaging member comprising a portion that radially outwardly extends towards the distal end of the stent-engaging member, the stent-engaging member configured to move a stent when distally advanced and configured to not move a stent when proximally retracted, wherein the proximal end of the stent-engaging member comprises an aperture, wherein the elongate inner member comprises an inner layer, and wherein an inner surface of the inner layer of the elongate inner member at least partially fills the aperture such that a portion of the inner layer extends inward of an outer surface of the proximal end of the stent-engaging member;
• wherein the stent-engaging member comprises a stem and a ratchet mechanically coupled to the stem by a plurality of spot welds on a first side of the ratchet, and the ratchet spaced from the stem by a pap on a second side of the ratchet opposite the first side of the ratchet.