Source: http://www.google.ca/patents/US8512013
Timestamp: 2017-11-21 23:17:42
Document Index: 43594852

Matched Legal Cases: ['art.\n11', 'Application No. 2007207782', 'Application No. 200780003014', 'Application No. 200780003014', 'Application No. 2008', 'Application No. 200780003014']

Patent US8512013 - Hydrodynamic thrust bearings for rotary blood pumps - Google Patents
A rotary blood pump includes a casing defining a pumping chamber. The pumping chamber has a blood inlet and a tangential blood outlet. One or more motor stators are provided outside of the pumping chamber. A rotatable impeller is within the pumping chamber and is adapted to cause blood entering the pumping...http://www.google.ca/patents/US8512013?utm_source=gb-gplus-sharePatent US8512013 - Hydrodynamic thrust bearings for rotary blood pumps
Publication number US8512013 B2
Application number US 11/654,216
Also published as CA2636418A1, CN101371041A, CN101371041B, CN103432637A, CN103432637B, EP1977110A2, EP1977110A4, US7976271, US7997854, US8540477, US8932006, US9242032, US9777732, US20070280841, US20080021394, US20080031725, US20120063942, US20130317283, US20140046118, US20150118021, US20160138597, WO2007084339A2, WO2007084339A3
Publication number 11654216, 654216, US 8512013 B2, US 8512013B2, US-B2-8512013, US8512013 B2, US8512013B2
Patent Citations (181), Non-Patent Citations (19), Referenced by (9), Classifications (21), Legal Events (2)
Hydrodynamic thrust bearings for rotary blood pumps
US 8512013 B2
a pumping chamber having an interior wall;
a rotatable impeller within said pumping chamber, said impeller having a plurality of sectors, adjacent sectors adjoining a blood flow path therebetween;
each of said sectors having a peripheral surface spaced by a gap from a portion of said interior wall of said pumping chamber when said impeller is rotating;
one or more of said peripheral surfaces of said impeller having a first inclined tapered region for capturing blood flow and a second oppositely inclined tapered region for ejecting blood flow, said first and second tapered regions being in tandem fluid flow communication across a flat bridging surface area therebetween, the taper depth of each of said tapered regions varying along its length in the direction of rotation of said impeller, each of said first and second tapered regions having a leading end and a trailing end, the leading end of said first tapered region being substantially perpendicular to the trailing end of said second tapered region, the taper depth of said first tapered region increasing hydrodynamic pressure on blood in said gap acting axially on said impeller when said impeller rotates, the taper depth of said second tapered region relieving hydrodynamic pressure on blood in said gap when said impeller rotates.
2. The blood pump of claim 1 in which each of said first and second tapered regions is substantially adjacent the periphery of said impeller.
3. The blood pump of claim 1 in which each of said first and second tapered regions is tapered in an axial direction relative to said impeller rotational axis.
4. The blood pump of claim 1 in which the depth of said gap is within the range of from approximately 0.003 inches to 0.020 inches when said impeller is rotating.
5. The rotary blood pump of claim 1 in which each of said one or more peripheral surfaces of each of said sectors of said impeller has said first and second tapered regions.
6. The rotary blood pump of claim 1 in which said rotatable impeller is made from an alloy of approximately 77.6% platinum by weight and 22.4% cobalt by weight.
7. The rotary blood pump of claim 1 in which each of first and second tapered regions is substantially flat in the radial direction relative to said impeller.
8. The rotary blood pump of claim 1 in which said impeller is made from titanium.
9. The blood pump of claim 1 comprising at least four of said sectors, adjacent ones of said sectors being separated by one of said blood flow paths, each of said blood flow paths extending to and defining a peripheral exit from said impeller.
10. The blood pump of claim 9 in which the peripheral exits from said impeller are substantially 90 degrees apart.
11. The blood pump of claim 9 in which each of said blood flow paths comprises a ramped bottom surface extending inwardly from substantially the bottom surface of said impeller at an inclined angle of substantially 32 degrees.
12. The blood pump of claim 1 comprising a plurality of said tandem first and second inclined tapered regions.
13. The blood pump of claim 12 in which said second tapered regions are each substantially triangular, an outside edge of which is at the circumference of said impeller.
14. The blood pump of claim 12 in which the leading end of each of said second tapered regions is adjacent the trailing end of one of said first tapered regions and the trailing end of each of said second tapered regions defines an inner edge at a sidewall of one of said blood flow paths.
15. The blood pump of claim 12 in which the leading end of each of said first tapered regions comprises an entrance edge at a trailing sidewall of one of said blood flow paths, the radius of curvature of each of said entrance edges being less than about 0.010 inches.
16. The rotary blood pump of claim 12 in which the angle of taper of each of said second tapered regions is more severe than the angle of taper of each of said first tapered regions.
17. The blood pump of claim 16 in which the angle of taper of each of said first tapered regions is less than 1 degree from its leading to trailing end.
18. The blood pump of claim 17 in which the angle of taper of each of said second tapered regions is within the range of from 2 to 4 degrees from its leading to trailing end.
With reference to FIG. 1, a motor rotor or pump impeller 22 is located within the pumping chamber 3 between the upper pump casing 1 and the lower pump casing 2. The impeller 22 is circular in cross section and may have a diameter of an inch or an inch and a quarter. The impeller is provided with a central hole 23. A center post or spindle 24 is attached to the lower pump casing 2 and protrudes from the axial. center thereof through the impeller hole 23 when the pump is assembled to support rotation of the impeller in the manner described in detail below. The center post 24 is provided with a peripheral lower flange 26 by which a lower annular ceramic disc 27 is retained to an interior surface of the lower pump casing 2. In one embodiment, the gap between the outer diameter of the center post 24 and the diameter of the impeller hole 23 is in the range of from 0.019 inches to 0.029 inches. The top portion of the center post 24 is formed as a conical surface 28. A substantial portion of the conical surface 28 of the center post protrudes above the impeller hole 23 during operation of the pump. In one embodiment, the radius of curvature of the cone shape is a relatively constant 0.389 inches. The tip of the cone is not necessarily a sharp point having, in one embodiment, a blending radius of 0.010 inches.
1 Examiner's First Report issued Aug. 11, 2011 in connection with Australian Patent Application No. 2007207782, filed Jul. 18, 2008.
3 Final Office Action issued Jul. 21, 2010 in connection with U.S. Appl. No. 11/654,226, filed Jan. 16, 2007.
4 First Office Action issued Dec. 18, 2009 in connection with Chinese Patent Application No. 200780003014.7, filed Jan. 12, 2007.
5 First Official Action, issued Dec. 18, 2009, in connection with Chinese Patent Application No. 200780003014.7 with English translation.
6 International Preliminary Report on Patentability issued by the International Bureau of WIPO in connection with International Application No. PCT/US2007/000763.
7 International Search Report issued Nov. 5, 2007 by the International Searching Authority (ISA/US) in connection with International Application No. PCT/US2007/000763.
8 Issue Notification Jul. 27, 2011 in connection with U.S. Appl. No. 11/654,217, filed Jan. 16, 2007.
9 Issue Notification Jun. 22, 2011 in connection with U.S. Appl. No. 11/654,226, filed Jan. 16, 2007.
10 Notice of Allowance issued Feb. 14, 2011 in connection with U.S. Appl. No. 11/654,217, filed Jan. 16, 2007.
11 Notice of Allowance issued Mar. 2, 2011 in connection with U.S. Appl. No. 11/654,226, filed Jan. 16, 2007.
12 Notice of Allowance issued Nov. 16, 2010 in connection with U.S. Appl. No. 11/654,226, filed Jan. 16, 2007.
13 Notice of Allowance issued Oct. 27, 2010 in connection with U.S. Appl. No. 11/654,217, filed Jan. 16, 2007.
14 Office Action issued Aug. 5, 2009 in connection with U.S. Appl. No. 11/654,217, filed Jan. 16, 2007.
15 Office Action issued Jun. 21, 2010 in connection with U.S. Appl. No. 11/654,217, filed Jan. 16, 2007.
16 Office Action issued Nov. 22, 2011 in connection with Japanese Patent Application No. 2008-550412, filed Jan. 12, 2007.
17 Office Action issued Sep. 23, 2009 in connection with U.S. Appl. No. 11/654,226, filed Jan. 16, 2007.
18 Second Office Action issued Mar. 5, 2012 in connection with Chinese Patent Application No. 200780003014.7, filed Jan. 12, 2007.
19 Written Opinion of the International Searching Authority issued by the International Searching Authority (ISA/US) in connection with International Application No. PCT/US2007/000763.
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U.S. Classification 417/423.12, 415/900
Cooperative Classification A61M1/127, A61M1/1015, A61M1/1017, A61M1/122, A61M1/101, A61M1/1031, A61M1/1008, F04D29/2255, F04D29/0473, F04D13/066, F04D7/04, A61M1/1029, F04D13/0666, F04D29/22, F04D29/0413, F04D13/0633, Y10S415/90, F04D29/048
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LAROSE, JEFFREY A;SHAMBAUGH, CHARLES R.;REEL/FRAME:019721/0158