US 8,574,291 B2Granted

Linear drive and pump system, in particular an artificial heart

AssigneesRheinisch-Westfaelische Technische Hochschule Aachen, Herz-und Diabeteszentrum NRW

InventorsThomas Finocchiaro, Thomas Butschen, Marc Lessmann, Kay Hameyer, Thomas Schmitz-Rode, Ulrich Steinseifer, Paul Barteld Kwant

Life of this patent

Estimating the term…

patentgrep

Loading patent…

Abstract

The invention relates to an electrical linear drive, in particular for a pump system of an artificial heart, with a movable part and a stationary part, wherein the stationary part is formed by a permanent magnet arrangement and the movable part is formed by a coil arrangement, or vice versa, and wherein the coil arrangement and the permanent magnet arrangement can be moved to and fro relative to each other in an axial direction by means of current passed through the coil arrangement. The invention further relates to an electrical linear drive of this kind in which the permanent magnet arrangement is designed as a stack of frame-shaped, in particular ring-shaped magnets, which are magnetized alternately radially and axially in the axial direction, such that the magnetic field is strengthened on one side of the frame.

Claims20

Dependent claims

An electric linear drive for a pump, the drive comprising:

a stationary part;
a movable part, one of the parts being formed by a permanent-magnet assembly having, relative to an axis, an axially polarized inner permanent magnet and an axially polarized outer permanent magnet each having a pair of axially opposite ends and together forming an axially extending air gap, the other of the parts being formed by a coil assembly having a single winding whose orientation reverses at least once axially;
respective inner and outer pole shoes at the axial ends of the inner and outer permanent magnets and axially spaced at the air gap such that the pole shoes concentrate a magnetic field of the permanent magnets in the air gap and a magnetic circuit is formed such that at one axial end of the permanent magnets the magnetic field lines extend through the air gap radially from the inside to the outside and at the other axial end through the air gap from the outside to the inside;
and
a force-transmission element extending in the air gap and connected to the movable part and to at least one pump chamber, whereby when an electrical current is applied to the coil assembly the element is shifted axially.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/670,708Filed 18 Aug 2008
Priority: DE 10 2007 039 01417 Aug 2007
Published: US 2010/0234941 A116 Sep 2010
Granted: 5 Nov 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H02K 41/031
Synchronous motors; Motors moving step by step; Reluctance motors: of the permanent magnet type
A61M 60/196
Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body: replacing the entire heart, e.g. total artificial…
A61M 60/422
For non-positive displacement blood pumps: the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps
F04B 15/00
Pumps adapted to handle specific fluids