Method of manufacturing centrifugal pump

A method of manufacturing a centrifugal pump, wherein the centrifugal pump includes a housing to defining a hollow body cavity as a pumping chamber, a blood inlet port, a blood outlet port, a centrifugal force applying member rotatably accommodated in the pumping chamber, and a support mechanism that supports the centrifugal force applying member including a shaft member installed at a rotational center axis of the centrifugal force applying member, a first bearing rotatably supporting one end portion of the shaft member, and a second bearing rotatably supporting the other end portion of the shaft member, wherein the housing includes a lid member in which the first bearing is installed and a bottom member in which the second bearing is installed, and wherein the lid member and the bottom member are comprised of a resin material having a flexibility such that the housing is expandable in response to pressurized blood in the hollow body cavity, the method comprising the steps of:

• arranging the housing, force applying member, and support mechanism along the rotational center axis into a preliminary assembly state;
• compressing the lid member and the bottom member along respective outer circumferential walls, wherein the housing is warped by compressing the lid member and bottom member against the shaft member such that an interface between the outer circumferential walls is increased by a predetermined distance after the first and second bearings are in contact with the shaft member;
• and
• joining the lid member and the bottom member by affixing the outer circumferential walls at the interface during the compression.