Drive assembly with fluid seal for use with a blood pump

A percutaneous blood pump, comprising:

• an impeller housing;
• an impeller assembly disposed within the impeller housing, the impeller assembly including an impeller rotatably positioned within the impeller housing;
• a motor positioned proximal of the impeller assembly and including a drive shaft extending distally therefrom, the motor configured to rotationally drive the impeller assembly;
• a drive sleeve circumferentially surrounding and affixed to a distal end portion of the drive shaft;
• a seal assembly comprising a seal housing and a sealing member secured to the seal housing;
• wherein the sealing member contacts a circumferential surface of the drive sleeve in sealing engagement therewith such that the drive sleeve is rotatable therein with rotation of the impeller.

A percutaneous blood pump, comprising:

• an impeller housing;
• a motor housing positioned proximal of the impeller housing;
• an impeller assembly disposed within the impeller housing;
• the impeller assembly including an impeller rotatably positioned within the impeller housing;
• a motor disposed within the motor housing;
• a drive shaft rotationally driven by the motor;
• a drive sleeve circumferentially surrounding a distal end region of the drive shaft and affixed thereto;
• wherein the drive sleeve is operably coupled to the impeller assembly such that the drive sleeve rotates with the drive shaft and the impeller;
• a seal assembly disposed within the impeller housing, the seal assembly comprising a lip seal circumferentially surrounding the drive sleeve and forming a fluid seal therebetween;
• wherein the lip seal provides a fluid seal between the impeller housing and the motor housing.