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US 6,794,789 B2Granted
Miniature motor
AssigneeImpella CardioSystems AG
InventorsThorsten Siess, Gebhard Doepper
Life of this patent
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AssigneeImpella CardioSystems AG
InventorsThorsten Siess, Gebhard Doepper
Estimating the term…
The micromotor serves to drive an impeller (12) rotating in a pump housing (14). The excitation winding of the micromotor is surrounded by an enveloping flux return structure (18) of ferromagnetic material divided into rings (35). The rings (35) are separated from each other by slots (25). The slots are produced by laser cutting of a continuous tube. The enveloping flux return structure has a small wall thickness of a few tenths of a millimeter. The rings (35) are mutually connected by bridges (26). The enveloping flux return structure (18) can be integrally formed with the pump housing (14) of the pump (11). The micromotor can be produced in a small format with a small diameter. It has a high flow rate at a correspondingly high rotational speed. The micromotor is particularly suitable for introducing blood pumps into the vascular system in a non-operative minimally invasive percutaneous manner.
A micromotor comprising a stator including a sleeve with an excitation winding and an enveloping flux return structure, wherein said enveloping return structure comprises an integral body formed from a single piece of sheet metal having spaced ferromagnetic rings wherein adjacent rings are connected by at least one bridge.
The micromotor of claim w, herein spaces between said spaced ferromagnetic rings are filled with a plastic material and said enveloping flux return structure forms an outer wall of a motor housing.
Dependencies are inferred from the claim text.