Cardiovascular support pump having an impeller with a variable flow area
AssigneeKardion GmbH
InventorsJohannes Bette, Vladimir Popov, Marvin Mitze
Life of this patent
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Abstract
The present disclosure is directed generally to mechanical cardiovascular support systems used in the medical field to assist the movement of blood. In particular the present disclosure is directed to an impeller having features that allow improved performance. An annular flow area around a rotating impeller may be variable along the axial length of the impeller. A first radial gap, between a distal region of the impeller and a surrounding tubular housing, may be greater or smaller than a second radial gap, between a proximal region of the impeller and the surrounding tubular housing.
Claims19
A mechanical circulatory support device comprising:
- a tubular cannula comprising an inflow region, an outflow region, and a distal impeller region, and
- an impeller having a proximal end and a distal end, the impeller being positioned within the tubular cannula at least partly in the outflow region and at least partly in the distal impeller region,
- wherein a radial gap between the impeller and an inner surface of the tubular cannula varies in size between the proximal end and the distal end, wherein the size of the radial gap at a particular location between the proximal end and the distal end comprises a radial distance between a maximum impeller width and the inner surface of the tubular cannula at the particular location,
- wherein the impeller comprises a distally tapered section tapering distally from a first diameter to a distal diameter, wherein the distal diameter is less than the first diameter, and
- wherein the impeller comprises a constant diameter section extending proximally from the distally tapered section to the proximal end of the impeller, the constant diameter section having the first diameter.
A mechanical circulatory support device comprising:
- a tubular cannula comprising an inflow region, an outflow region, and a distal impeller region,
- an impeller having a proximal end and a distal end, the impeller being positioned within the tubular cannula at least partly in the outflow region and at least partly in the distal impeller region, wherein the impeller has a constant diameter within the outflow region;
- and
- a driven magnetic rotor, wherein the impeller is coupled to the driven magnetic rotor,
- wherein a radial gap between the impeller and an inner surface of the tubular cannula varies in size between the proximal end and the distal end, wherein the size of the radial gap at a particular location between the proximal end and the distal end comprises a radial distance between a maximum impeller width and the inner surface of the tubular cannula at the particular location.
A mechanical circulatory support device comprising:
- a tubular cannula comprising an inflow region, an outflow region, and a distal impeller region, and
- an impeller positioned in the tubular cannula partly in the outflow region and partly in the distal impeller region,
- wherein a first radial gap between the impeller and the distal impeller region is smaller than a second radial gap between the impeller and the outflow region of the tubular cannula, and
- wherein the impeller has a constant diameter from a proximal end to a distal end of the impeller.
Dependencies are inferred from the claim text.