Systems and methods for pump-assisted blood circulation

An apparatus for pumping blood, the apparatus comprising:

• a pump housing having an outer wall radially disposed about a longitudinal pump axis, the pump housing having an upstream end and a downstream end;
• an impeller positioned between the upstream end and the downstream end of the pump housing;
• and
• a pump drive positioned circumferentially about the impeller and configured to impart a rotational motion to the impeller by applying a magnetic field to the impeller;
• wherein the outer wall of the pump housing includes an externally facing engagement feature and a surface transverse to the longitudinal pump axis, and wherein a tube is configured to modify a dimension of the pump housing by being rotated about the externally facing engagement feature and abut the surface.

An apparatus for pumping blood, the apparatus comprising:

• a pump housing having an outer wall radially disposed about a longitudinal pump axis, the pump housing having an upstream end and a downstream end;
• a front bearing mount positioned in the upstream end of the pump housing and secured to the pump housing;
• a rear bearing mount positioned in the downstream end of the pump housing and secured to the pump housing;
• an impeller having a plurality of helically wound blades and positioned between the front bearing mount and the rear bearing mount within the pump housing;
• and
• a pump drive positioned circumferentially about the impeller and configured to impart a rotational motion to the impeller by applying a magnetic field to the impeller;
• wherein the pump housing includes an externally facing engagement feature and a surface transverse to the longitudinal pump axis, and wherein a stretcher is configured to modify an axial length of a portion of the pump housing by being moved along the externally facing engagement feature and abutting the surface.