Expandable impeller pump

A method for manufacturing a catheter pump, the method comprising:

• providing an impeller body;
• forming an expandable and collapsible sleeve comprising a mesh and an elastic coating about the mesh, the mesh disposed between an inlet and an outlet of the catheter pump, the mesh arranged such that the sleeve has a collapsed configuration and an expanded configuration, the mesh arranged such that the sleeve remains in the expanded configuration when the impeller body and the sleeve are positioned within a patient during operation of the catheter pump, the sleeve in the expanded configuration defining a flow path through which blood flows, the mesh further arranged such that the sleeve is configured to move to the collapsed configuration from the expanded configuration for storing the catheter pump;
• and
• disposing the impeller body within at least a portion of the expandable and collapsible sleeve such that the mesh substantially surrounds the impeller body,
• wherein the outlet is defined at least in part by the mesh, wherein the outlet comprises an open mesh region that is not covered by the elastic coating such that blood can discharge through the outlet.

A catheter pump comprising:

• an expandable and collapsible sleeve comprising a mesh and an elastic coating about the mesh, the mesh disposed between an inlet and an outlet of the pump, the outlet defined at least in part by the mesh, wherein the outlet comprises an open mesh region that is not covered by the elastic coating such that blood can discharge through the outlet;
• and
• an impeller body positioned within at least a portion of the expandable and collapsible sleeve,
• the mesh arranged such that the sleeve has a collapsed configuration and an expanded configuration, the mesh arranged such that the sleeve remains in the expanded configuration when the impeller body and the sleeve are positioned within a patient during operation of the catheter pump, the sleeve in the expanded configuration defining a flow path through which blood flows, the mesh further arranged such that the sleeve is configured to move to the collapsed configuration from the expanded configuration for storing the catheter pump.

A catheter pump comprising:

• an expandable sleeve comprising a mesh disposed between inlets and outlets of the pump;
• and
• an impeller body positioned within at least a portion of the expandable sleeve;
• wherein the expandable sleeve encloses a fluid flow path, the catheter pump further comprising fluid flow modifying elements disposed in the fluid flow path to influence flow dynamics in the fluid flow path, and
• wherein the fluid flow modifying elements comprise linear elements.

A catheter pump comprising:

• an expandable sleeve comprising a mesh disposed between inlets and outlets of the pump;
• and
• an impeller body positioned within at least a portion of the expandable sleeve, wherein the expandable sleeve encloses a fluid flow path, the catheter pump further comprising fluid flow modifying elements disposed in the fluid flow path to influence flow dynamics in the fluid flow path, and
• wherein the fluid flow modifying elements are configured to remove swirl velocity from the impeller discharge flow.

A method for manufacturing a catheter pump, the method comprising:

• providing an impeller body;
• forming an expandable and collapsible sleeve comprising a mesh, the mesh arranged such that the sleeve has a collapsed configuration and an expanded configuration, the mesh arranged such that the sleeve remains in the expanded configuration when the impeller body and the sleeve are positioned within a patient during operation of the catheter pump, the sleeve in the expanded configuration defining a flow path through which blood flows, the mesh further arranged such that the sleeve is configured to move to the collapsed configuration from the expanded configuration for storing the catheter pump;
• disposing the impeller body within at least a portion of the expandable and collapsible sleeve such that the mesh substantially surrounds the impeller body;
• and
• coupling the impeller to a distal portion of an elongate body having sufficient length such that, when the impeller body is positioned within a patient, the distal portion of the elongate body is positioned within the patient and a proximal portion of the elongate body is positioned outside the patient.

A catheter pump comprising:

• an expandable and collapsible sleeve comprising a mesh disposed between inlets and outlets of the pump;
• an impeller body positioned within at least a portion of the expandable and collapsible sleeve,
• the mesh arranged such that the sleeve has a collapsed configuration and an expanded configuration, the mesh arranged such that the sleeve remains in the expanded configuration when the impeller body and the sleeve are positioned within a patient during operation of the catheter pump, the sleeve in the expanded configuration defining a flow path through which blood flows, the mesh further arranged such that the sleeve is configured to move to the collapsed configuration from the expanded configuration for storing the catheter pump;
• and
• an elongate body having a distal portion and a proximal portion, the impeller body coupled to the distal portion of the elongate body,
• wherein the impeller body and the elongate body are arranged such that, when the impeller body is positioned within a patient, the distal portion of the elongate body is positioned within the patient and the proximal portion of the elongate body is positioned outside the patient.

A catheter pump comprising:

• an expandable and collapsible sleeve comprising a mesh disposed between an inlet and an outlet of the pump;
• and
• an impeller body positioned within at least a portion of the expandable and collapsible sleeve,
• the mesh arranged such that the sleeve has a collapsed configuration and an expanded configuration, the mesh arranged such that the sleeve remains in the expanded configuration when the impeller body and the sleeve are positioned within a patient during operation of the catheter pump, the sleeve in the expanded configuration defining a flow path through which blood flows, the mesh further arranged such that the sleeve is configured to move to the collapsed configuration from the expanded configuration for storing the catheter pump,
• wherein the outlet is defined in a transition region between a first portion of the mesh surrounding the impeller and a non-expandable elongate member, the non-expandable elongate member extending proximally from the transition region,
• wherein the transition regions comprises a second portion of the mesh that is coarser than the first portion of the mesh surrounding the impeller.