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Rotary blood pump with ceramic members
| Details |
Inventors: Cao, Hengchu; Lancisi, David M.;
Assignee: Kriton Medical, Inc. (Sacramento, CA)
Primary Examiner: Freay; Charles G.
Assistant Examiner: Evora; Robert Z.
Attorney, Agent or Firm: Gerstman; George H. Seyfarth, Shaw
An implantable rotary blood pump including a rotor mounted for rotation within a pump housing. The rotor has a shaft portion and an impeller carried by the shaft portion. A rotor motor is provided, with a motor including a plurality of permanent magnets carried by the impeller and motor stators on opposite sides of the impeller. Structural members are provided between the impeller and stators to provide structural support and hermetical sealing. The structural members comprise biocompatible, corrosion resistant, electrically non-conducting ceramic material, which alleviate eddy current losses. |
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DETAILED DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENT Referring to the drawing, an electromagnetically driven ventricular assist device or blood pump 10 is illustrated.
Electromagnetically driven blood pumps have the advantage of compact size and energy efficiency compared to pneumatic or hydraulic driven systems.
Blood pump 10 is preferably sufficiently compact to be implantable in the human body.
The pump is of any rotary design, including but not limited to centrifugal, axial flow, or hybrid flow designs.
The preferred embodiment illustrated herein utilizes two stators, each on opposite sides of the impeller and each having a number of stator coils and pole pieces.
An example of an implantable heart pump with two stators is the FIGS.
11-14 embodiment of Wampler U.
S.
Pat.
No.
5,840,070, the disclosure of which is incorporated herein.
It is understood, however, that no limitation is intended with respect to the particular heart pump to which the present system is applicable.
As illustrated in the FIGURE, rotary blood pump 10 includes a forward pump housing 12 having radial magnetic bearings in the form of ring magnets 34 carried by forward housing 12, surrounding an elongated inlet tube 13 with an entry end 13' and an impeller casing or a volute 14.
A discharge tube 16 communicates with the interior periphery of casing 14.
Tube 16 has a tangential orientation with respect to the radius of the casing 14, for effectively channeling the blood output from the pump.
A pump rotor 17 is located within housing 12 and includes a support shaft 18 attached to an impeller 20.
Impeller 20, support shaft 18 and rotor 17 have an impeller housing 21.
There is a blood flow path 22 between rotor 17 and the inner sidewalls 23 of inlet tube 13.
Rotor 17 is mounted for rotation about a longitudinal axis which extends both through shaft 18 and impeller 20.
Impeller 20 has a number of blade sectors that are relatively thick in the axial direction.
The thick impeller 20 has the ability to utilize permanent magnetic pieces 20a and 20b and others, that are inserted in a manner enabling a pair of stators 24 and 26 to be on opposite sides of the impeller 20
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Heart Surgery 
