Catheter pump

A catheter for a heart pump, comprising

• a flexible catheter body having a proximal end and a distal end and defining a plurality of lumens configured to convey an infusant therethrough, the catheter body being sufficiently flexible to extend from a peripheral access to a patient's heart;
• an impeller having a shaft and at least one blade;
• a bearing housing in which the shaft is journaled for rotation;
• and
• a coupler having a distal end configured to be coupled with the bearing housing and a proximal end configured to be coupled with the catheter body, the proximal end being disposed proximal of the distal end of the lumens of the catheter body;
• wherein the catheter assembly is configured such that a first portion of the infusant flows from a distal port in a distal direction over the impeller shaft and a second portion of the infusant flows from the distal port in a proximal direction over the impeller shaft.

A heart pump configured to be applied percutaneously, comprising:

• a catheter assembly comprising a proximal end, a distal end, and an elongate body extending therebetween, the elongate body having a drive lumen extending therethrough;
• an impeller assembly comprising an impeller shaft and an impeller disposed on the impeller shaft;
• and
• a drive shaft disposed in the drive lumen, the drive shaft having a plurality of layers;
• wherein the drive shaft comprises first and second coil wire lavers wound in opposite directions.

A heart pump comprising

• a catheter assembly comprising a proximal end, a distal end, and an elongate body extending therebetween;
• an impeller assembly coupled with the elongate body and comprising an impeller shaft and an impeller disposed on the impeller shaft;
• a bearing disposed between the proximal end of the impeller shaft and the distal end of the catheter assembly;
• and
• an infusant inflow port disposed distal of the bearing and configured to direct infusant radially inwardly toward the impeller shaft.

A catheter assembly for a heart pump, comprising:

• a flexible catheter body having a proximal portion and a distal portion and defining one or more lumens therethrough, the catheter body having a central longitudinal axis and being configured to extend from a peripheral access to a patient's heart;
• and
• an impeller assembly having an impeller and a housing in which the impeller is disposed,
• wherein the distal portion of the catheter body and a proximal portion of the impeller assembly are joined along a length, the distal portion of the catheter body being disposed between an overlying member of the catheter assembly and the central longitudinal axis,
• wherein the distal portion of the catheter body is mechanically engaged with the overlying member by a projection of one of the catheter body and the overlying member into the other of the catheter body and the overlying member.