Intravascular fluid movement devices, systems, and methods of use
An intravascular fluid movement device that includes an expandable member having a collapsed, delivery configuration and an expanded, deployed configuration, the expandable member having a proximal end and a distal end, a rotatable member disposed radially and axially within the expandable member, and a conduit coupled to the expandable member, the conduit at least partially defining a blood flow lumen between a distal end of the conduit and a proximal end of the conduit, the conduit disposed solely radially inside of the expandable member in a distal section of the expandable member.
1 . An intravascular blood pump, comprising:
a deployable distal working portion, including, in a deployed configuration:
a distal expandable section with a collapsed delivery configuration and a deployed configuration, the distal expandable section having a proximal end and a distal end;
a proximal expandable section with a collapsed delivery configuration and a deployed configuration, the proximal expandable section having a proximal end and a distal end, the distal end of which is axially spaced from the proximal end of the distal expandable section;
the distal expandable section and the proximal expandable section comprising an expandable mesh structure;
an impeller disposed radially and axially within the proximal expandable section;
a blood impermeable conduit coupled to the distal expandable section and the proximal expandable section and extending axially between the proximal end of the distal expandable section and the distal end of the proximal expandable section, the conduit at least partially defining a blood flow lumen between a distal end of the conduit and a proximal end of the conduit,
wherein a portion of one or more blades of the impeller extends further proximally than the proximal end of the blood impermeable conduit,
wherein a central region of the blood impermeable conduit spans an axial distance, and the impeller, the expandable mesh structure of the distal expandable section, and the proximal expandable section do not extend axially into the central region,
wherein the distal end of the distal expandable section extends further distally than the distal end of the blood impermeable conduit, and the proximal end of the proximal expandable section extends further proximally than the proximal end of the blood impermeable conduit; and
an elongate portion extending proximally from the working portion.
2 . The blood pump of claim 1 , further comprising a central expandable section positioned in the central region between the proximal expandable section and the distal expandable section.
3 . The blood pump of claim 2 , wherein the blood impermeable conduit comprises a membrane coupled to the proximal expandable section, the central expandable section, and the distal expandable section.
4 . The blood pump of claim 2 , wherein part of the impeller is disposed within the proximal expandable section proximal to the blood impermeable conduit.
5 . The blood pump of claim 4 , wherein the blood impermeable conduit extends distally from the impeller to a pump inlet of the distal expandable section.
6 . The blood pump of claim 1 , wherein the proximal expandable section is coupled to a at least one bearing, wherein a drive mechanism extends through the at least one bearing.
7 . The blood pump of claim 1 , wherein the distal expandable section comprises a plurality of elongate segments disposed relative to one another to define a plurality of apertures, wherein at least a portion of one of the plurality of apertures is distal to the distal end of the blood impermeable conduit, defining at least one blood inlet aperture to allow blood to enter the blood impermeable conduit.
8 . The blood pump of claim 7 , wherein the proximal expandable section comprises a plurality of elongate segments disposed relative to one another to define a second plurality of apertures, wherein at least a portion of one of the second plurality of apertures is proximal to the proximal end of the blood impermeable conduit, defining at least one outlet aperture to allow blood to exit the blood impermeable conduit.
9 . The blood pump of claim 1 , wherein the blood impermeable conduit is made of material such that, in the central region axially between the distal and proximal expandable sections, the material is adapted to deform radially inward more easily than the expandable sections in response to radially inward forces on the working portion.
10 . The blood pump of claim 1 , wherein the blood impermeable conduit is coupled to the proximal expandable section at a location along the proximal expandable section with a greatest radial dimension measured orthogonally relative to a longitudinal axis of the proximal expandable section, and wherein the blood impermeable conduit is coupled to the distal expandable section at a location along the distal expandable section with a greatest radial dimension measured orthogonally relative to a longitudinal axis of the distal expandable section.
11 . The blood pump of claim 1 , wherein the distal and proximal expandable sections are self-expandable.
12 . The blood pump of claim 1 , wherein the impeller is self-expandable.
13 . An intravascular blood pump, comprising:
a deployable distal working portion, including, in a deployed configuration:
a distal expandable section with a collapsed delivery configuration and a deployed configuration, the distal expandable section comprising a first mesh pattern having a proximal end and a distal end;
a proximal expandable section with a collapsed delivery configuration and a deployed configuration, the proximal expandable section comprising a second mesh pattern having a proximal end and a distal end, the distal end of which is axially spaced from the proximal end of the distal expandable section;
a central section disposed between the distal expandable section and the proximal expandable section, wherein the first mesh pattern of the distal expandable section and the second mesh pattern of the proximal expandable section do not extend axially into the central section;
an impeller disposed radially and axially within the proximal expandable section;
a blood impermeable conduit coupled to the distal expandable section and the proximal expandable section and extending axially between the proximal end of the distal expandable section and the distal end of the proximal expandable section, the conduit at least partially defining a blood flow lumen between a distal end of the conduit and a proximal end of the conduit,
wherein the distal end of the distal expandable section extends further distally than the distal end of the blood impermeable conduit, and the proximal end of the proximal expandable section extends further proximally than the proximal end of the blood impermeable conduit, and wherein a portion of one or more blades of the impeller extends further proximally than the proximal end of the conduit; and
an elongate portion extending proximally from the working portion.