Patent ID: 11918800
Assignee: TC1 LLC
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 10:
11. A motor assembly for use in a catheter pump system, the motor assembly comprising:
a rotor;
a shaft assembly coupled to the rotor and extending distally of the rotor; and
a flow diverter disposed and fluidly sealed about the rotor and a proximal portion of a catheter assembly, the flow diverter spaced apart from the rotor by a gap to define a rotor chamber between the flow diverter and the rotor, wherein the rotor chamber is configured to be filled with a gas pressurized to a gas pressure to facilitate sealing the rotor chamber and to partially surround the rotor and a portion of the shaft assembly within the rotor chamber,
wherein a first pressure of the gas in the rotor chamber is greater than atmospheric pressure and greater than a second pressure of a proximally-flowing fluid along a first pathway such that the first pressure impedes the fluid from entering the rotor chamber,
wherein the proximally-flowing fluid passes along an inner lumen of the shaft assembly, and
a conduit providing a second pathway, the conduit configured to bypass a portion of the proximally-flowing fluid around the motor assembly, wherein the gas is drawn through the conduit.