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| Method and device for left atrial appendage occlusion |
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| Method and apparatus for patching a tissue opening |
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| Filter apparatus for ostium of left atrial appendage |
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| Patches and collars for medical applications and methods of use |
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| Device for containing embolic material in the LAA having a plurality of tissue retention structures |
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| Control of tissue growth in textured blood-contacting surfaces |
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Ceramic pivot bearing arrangement for a sealless blood pump
| Details |
Inventors: Nose , Yukihiko; Takatani, Setsuo; Sakuma, Ichiro; Ohara, Yasuhisa; Makinouchi, Kenzo;
Assignee: Kyocera Corporation (Kyoto, JP); Baylor College of Medicine (Houston, TX)
Primary Examiner: Freay; Charles G.
Assistant Examiner:
Attorney, Agent or Firm: Loeb & Loeb LLP
A centrifugal blood pump, used for heart-lung machines or the like, having at least one impeller, a casing having an inlet and an outlet, the casing formed to have a space for rotatably housing the at least one impeller and a magnetic drive disposed outside the casing. The impeller may have vanes attached thereto for forcing fluid through the casing. Further the vanes may have magnets imbedded therein. The magnetic drive and the imbedded magnets cooperate to rotate the impeller. The impeller may have pivots integrated at opposing ends for allowing the impeller to rotate about a horizontal axis. The pivots may be supported by pivot bearings disposed within the casing. The pivots and the pivot bearings may be made of a ceramic material. |
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DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel centrifugal blood pump comprising a casing having a suction inlet and a delivery outlet, an impeller of a rotationally symmetric shape which is encased in the casing, and a magnet drive means disposed outside the casing coaxially to the impeller.
The impeller has a rotary vane section equipped with pump vanes on the external surface thereof and a cylindrical section located on the suction inlet side away from the rotary vane section.
The cylindrical section is equipped with a magnet means such as permanent magnets to magnetically rotate the impeller around the rotation center (axis) thereof in cooperation with the above-mentioned magnet drive means.
The magnetic drive means is located to coaxially enclose the magnetic means of the cylindrical section of the impeller with the casing interposed therebetween.
The impeller is supported by a bearing at the end of the impeller's rotation center at least on the rotary vane section side.
In the preferred embodiment of the present invention, the end of the impeller's rotation center on the rotary vane section side is supported by a pivot and a pivot bearing.
Both the pivot and pivot bearing included in the pivot-bearing combination are preferably made of ceramics.
When the rotationally symmetric impeller is rotated around the enter thereof, the impeller rotates stably and self-supportingly around the lower end of the rotation center by the gyroscopic function.
The impeller is mainly supported by the bearing on the lower section side, that is, on the rotary vane section side and no large load is applied to the bearing on the upper section side.
It is thus possible to omit the bearing at the end section of the impeller's rotation center on the impeller's top section side.
However, the bearing used to support the end section can allow the impeller to rotate more stably.
Either a contact-type bearing, such as a pivot bearing or a journal bearing, or a non-contact-type bearing, such as a magnet bearing, can be used as the bearing used at the upper end section
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