Blood pump with micromotor
AssigneeAbiomed Europe GmbH
InventorsThorsten Siess, Frank Kirchhoff
Life of this patent
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Abstract
The invention relates to a micromotor (10), the stator of which contains a back iron jacket (18). Said back iron jacket consists of a continuous unslotted sleeve consisting of a metal alloy that contains ferritic iron as the main constituent, up to 30% chromium and preferably aluminium and yttrium oxide. Electric conductivity is reduced by the oxidation of the aluminium. The yttrium oxide performs the same function. The reduced electric conductivity suppresses eddy currents to a great extent. The back iron jacket (18) has a high magnetic conductivity with a small wall thickness, thus increasing the electrical output for a motor with a small diameter.
Claims12
A blood pump sized for intravascular insertion, the blood pump comprising:
- a micromotor comprising a stator and a rotor surrounded by the stator;
- and
- a pump portion axially following the micromotor, wherein the pump portion comprises an impeller fastened to a shaft, and wherein the impeller is arranged for rotation within a housing of the blood pump,
- wherein the stator comprises:
- a shell containing an exciter coil;
- and
- a magnetic-reflux jacket surrounding the shell continuously, wherein the magnetic-reflux jacket is unslotted and is made of a magnetically conductive material, wherein the magnetically conductive material is a ferritic alloy, wherein the ferritic alloy comprises iron as the main component and further comprises 17 wt. % to 30 wt. % of chromium and 3 wt. % to 8 wt. % of aluminum.
A blood pump sized for intravascular insertion, the blood pump comprising:
- a micromotor comprising a stator and a rotor surrounded by the stator;
- and
- a pump portion axially following the micromotor, wherein the pump portion comprises an impeller fastened to a shaft, and wherein the impeller is arranged for rotation within a housing of the blood pump,
- wherein the stator comprises:
- a shell containing an exciter coil;
- and
- a magnetic-reflux jacket surrounding the shell continuously, wherein the magnetic-reflux jacket is unslotted and is made of a magnetically conductive material, wherein the magnetically conductive material is a ferritic alloy, wherein the ferritic alloy comprises iron as the main component and further comprises the following components:
- chromium
- 18.5%-21.50%
- aluminum
- 3.75%-5.75%
- titanium
- 0.20%-0.60%
- yttrium oxide
- 0.30%-0.70%
- carbon
- up to 0.10 wt. %
- copper
- up to 0.15 wt. %
- manganese
- up to 0.30 wt. %
- cobalt
- up to 0.30 wt. %
- nickel
- up to 0.50 wt. %
- phosphorous
- up to 0.02 wt. %.
Dependencies are inferred from the claim text.