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US 11,446,482 B2Granted
Intravascular blood pump
AssigneeAbiomed Europe GmbH
InventorsFrank Kirchhoff, Thorsten Siess, Wolfgang Kerkhoffs
Life of this patent
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Abstract
An intravascular blood pump having a rotatable shaft carrying an impeller and a housing with an opening through which the shaft extends with the impeller positioned outside the housing. The shaft and the housing have surfaces forming a circumferential gap which converges towards the impeller-side end of the gap and which has a minimum gap width of preferably no more than 5 μm, more preferably no more than 2 μm.
Claims15
An intravascular blood pump, comprising:
- a rotatable shaft carrying an impeller;
- and
- a housing having an opening;
- wherein the shaft extends through the opening with the impeller positioned outside said housing, the shaft and the housing having surfaces forming a circumferential gap within said opening, wherein the gap has a length and a width, said width having a minimum width located somewhere within 50% of the length of the gap closest to an impeller-side end of the gap;
- and wherein the gap converges over at least part of its length up to where the gap has the minimum width.
2 more elements
Dependencies are inferred from the claim text.