US5399074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor driven sealless blood pump
Assignee: Kyocera Corp
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Filing: 1992-09-04
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Granted: 1995-03-21
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Expires: 2012-09-04
Abstract
Abstract A centrifugal blood pump, used for heart-lung machines or the like, comprises an impeller, a casing having a suction inlet and a delivery outlet and being equipped with a space for rotatably accommodating the impeller, and a magnetic drive means disposed outside the casing. The impeller is of a rotationally symmetric shape and has a rotary vane section and a cylindrical section equipped with a magnet means. The magnet drive means for generating a rotating magnetic field coaxially encloses the magnet means of the above-mentioned cylindrical section and rotates the impeller in cooperation with the magnet means. At least the end section of the impeller's rotation center on the rotary vane section side is supported preferably by a pivot bearing. The pivot and the bearing thereof are preferably made of ceramics.
Inventors
- 👤 Yukihiko Nose
- 👤 Setsuo Takatani
- 👤 Ichiro Sakuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:45
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/04; F04D29/046; F04D29/0465; A; A61; A61M; A61M60/00; A61M60/10; A61M60/104; A61M60/109; A61M60/113; A61M60/20; A61M60/205; A61M60/216; A61M60/226; A61M60/232; A61M60/40; A61M60/403; A61M60/419; A61M60/422; A61M60/80; A61M60/802; A61M60/804; A61M60/81; A61M60/818; A61M60/825; A61M60/845; A61M60/849; F04D29/0467; F04D29/18; F04D29/22; F04D29/24; F04D29/242; F05; F05C; F05C2203/00; F05C2203/08; F05C2203/0804; F05C2203/0813; F05C2203/0817; Y; Y10; Y10S; Y10S415/00; Y10S415/90
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
132 words
A blood pump comprising a casing having a suction side provided with a suction inlet and an outlet side provided with 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 said impeller, said impeller having a rotary vane section on the outlet side and a cylindrical section equipped with a magnet means on the suction side away from the rotary vane section, and said magnet drive means being positioned so as to enclose the magnet means with the casing interposed therebetween in order to rotate the impeller around the rotation center thereof in cooperation with the magnet means, wherein the impeller is supported at the outlet side by a pivot and a pivot bearing.
Claim 2
Dependent Claim
132 words
A blood pump comprising a casing having a suction side provided with a suction inlet and an outlet side provided with 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 said impeller, said impeller having a rotary vane section on the outlet side and a cylindrical section equipped with a magnet means on the suction side away from the rotary vane section, and said magnet drive means being positioned so as to enclose the magnet means with the casing interposed therebetween in order to rotate the impeller around the rotation center thereof in cooperation with the magnet means, wherein the impeller is supported at the outlet side by a pivot and a pivot bearing.
Claim 3
Dependent Claim
20 words
A blood pump according to claim 1, wherein the impeller is supported at the suction side by a contact-type bearing.
Claim 4
Dependent Claim
20 words
A blood pump according to claim 1, wherein the impeller is supported at the suction side by a non-contact-type bearing.
Claim 5
Dependent Claim
14 words
A blood pump according to claim 1, wherein said pivot is made of ceramics.
Claim 6
Dependent Claim
37 words
A blood pump according to claim 4, wherein said rotary vane section of said impeller has a surface which faces said pivot and pivot bearing, and said impeller further comprises vanes on said surface of said impeller.
Claim 7
Dependent Claim
47 words
A blood pump according to claim 1 or 4, wherein the ratio of the radius of curvature r of the leading end of said pivot to the radius of curvature R of the recessed curved surface of said bearing is in the range of 1 to 4.
Claim 8
Dependent Claim
60 words
A blood pump according to claim 1, or 4, wherein said magnetic means is composed of permanent magnets, said magnetic drive means is composed of an electric coil for generating a rotating magnetic field, and the gap between said cylindrical section equipped with said magnetic means and said casing opposite thereto is in the range of 0.5 to 3.0 mm.
Claim 9
Dependent Claim
49 words
A blood pump according to claim 1 or 5, wherein said magnet means and said magnet drive means are composed of permanent magnets, and the gap between said cylindrical section equipped with said magnet means and said casing opposite thereto is in the range of 0.5 to 10.0 mm.
Claim 10
Dependent Claim
60 words
A blood pump according to claim 1 or 4, wherein the casing forms a chamber containing the impeller and communicating with the delivery outlet, and through holes passing between said chamber and the outside of said casing are provided at positions around said bearing for supporting the end section of the impeller's rotation center on the rotary vane section side.
Claim 11
Dependent Claim
15 words
A blood pump according to claim 1 wherein said pivot bearing is made of ceramics.
Claim 12
Dependent Claim
45 words
A blood pump according to claim 10, wherein the ratio of the radius of curvature R of the leading end of said pivot to the radius of curvature R of the recessed curved surface of said bearing is in the range of 1 to 4.
Claim 13
Dependent Claim
58 words
A blood pump according to claim 10, wherein said magnetic means is composed of permanent magnets, said magnetic drive means is composed of an electric coil for generating a rotating magnetic field, and the gap between said cylindrical section equipped with said magnetic means and said casing opposite thereto is in the range of 0.5 to 3.0 mm.
Claim 14
Dependent Claim
47 words
A blood pump according to claim 10, wherein said magnet means and said magnet drive means are composed of permanent magnets, and the gap between said cylindrical section equipped with said magnet means and said casing opposite thereto is in the range of 0.5 to 10.0 mm.
Claim 15
Dependent Claim
58 words
A blood pump according to claim 10 wherein the casing forms a chamber containing the impeller and communicating with the delivery outlet, and through holes passing between said chamber and the outside of said casing are provided at positions around said bearing for supporting the end section of the impeller's rotation center on the rotary vane section side.
Claim 16
Dependent Claim
37 words
A blood pump according to claim 10, wherein said rotary vane section of said impeller has a surface which faces said pivot and pivot bearing, and said impeller further comprises vanes on said surface of said impeller.
Claim 17
Dependent Claim
178 words
A blood pump comprising a casing having a suction side provided with a suction inlet and an outlet side provided with 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 said impeller, said impeller having a rotary vane section on the outlet side and a cylindrical section equipped with a magnet means on the suction side away from the rotary vane section, and said magnet drive means being positioned so as to enclose the magnet means with the casing interposed therebetween in order to rotate the impeller around the rotation center thereof in cooperation with the magnet means, wherein the impeller is supported at the outlet side by a bearing, the casing forms a chamber containing the impeller and communicating with the delivery outlet, and through holes passing between said chamber and the outside of said casing are provided at positions around said bearing for supporting the end section of the impeller's rotation center on the rotary vane section side.
Claim 18
Dependent Claim
178 words
A blood pump comprising a casing having a suction side provided with a suction inlet and an outlet side provided with 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 said impeller, said impeller having a rotary vane section on the outlet side and a cylindrical section equipped with a magnet means on the suction side away from the rotary vane section, and said magnet drive means being positioned so as to enclose the magnet means with the casing interposed therebetween in order to rotate the impeller around the rotation center thereof in cooperation with the magnet means, wherein the impeller is supported at the outlet side by a bearing, the casing forms a chamber containing the impeller and communicating with the delivery outlet, and through holes passing between said chamber and the outside of said casing are provided at positions around said bearing for supporting the end section of the impeller's rotation center on the rotary vane section side.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-20 | 1998-09-19 | 1999-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-20 | 2002-09-19 | 2003-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-20 | 2006-09-19 | 2007-03-21 | $7700.00 | Window Closed / Lapsed |