BLOOD PUMP WITH MICROMOTOR
First Claim
1. A blood pump with micromotor (10), provided for intracorporeal use, said blood pump comprising a stator (15) accommodating a shell (17) containing an exciter coil (24), and accommodating a magnetic-reflux jacket (18) made of magnetically conductive material and surrounding said shell (17),characterized inthat said magnetic-reflux jacket (18) consists of a one-pieced unslotted shell made of a ferritic material containing iron as the main component and up to 30% chromium.
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Accused Products
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.
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Citations
8 Claims
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1. A blood pump with micromotor (10), provided for intracorporeal use, said blood pump comprising a stator (15) accommodating a shell (17) containing an exciter coil (24), and accommodating a magnetic-reflux jacket (18) made of magnetically conductive material and surrounding said shell (17),
characterized in that said magnetic-reflux jacket (18) consists of a one-pieced unslotted shell made of a ferritic material containing iron as the main component and up to 30% chromium.
Specification