Rotary blood pump
First Claim
1. A blood pump, comprising:
- a pump housing having a blood flow path therethrough;
a first stator mounted to said pump housing, said first stator having a first stator field winding for producing a first stator magnetic field;
a first rotor mounted within said pump housing for rotation about a longitudinal axis of said first rotor in response to said first stator magnetic field, said first rotor carrying a blade thereon for propelling blood through said pump housing along said blood flow path, at least a portion of said blade being affixed to said rotor at an angle that is offset with respect to said longitudinal axis;
a plurality of magnets secured to said at least a portion of said blade affixed to said rotor at an angle that is offset with respect to said longitudinal axis, said plurality of magnets producing a first rotor magnetic field that passes through said first stator field winding during said rotation of said first rotor to induce a back emf within said first stator field winding; and
back emf sensor circuitry connecting to said first stator field winding to sense said back emf produced during said rotation of said first rotor within said pump housing.
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0 Petitions
Accused Products
Abstract
A rotary blood pump includes a pump housing for receiving a flow straightener, a rotor mounted on rotor bearings and having an inducer portion and an impeller portion, and a diffuser. The entrance angle, outlet angle, axial and radial clearances of blades associated with the flow straightener, inducer portion, impeller portion and diffuser are optimized to minimize hemolysis while maintaining pump efficiency. The rotor bearing includes a bearing chamber that is filled with cross-linked blood or other bio-compatible material. A back emf integrated circuit regulates rotor operation and a microcomputer may be used to control one or more back emf integrated circuits. A plurality of magnets are disposed in each of a plurality of impeller blades with a small air gap. A stator may be axially adjusted on the pump housing to absorb bearing load and maximize pump efficiency.
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Citations
49 Claims
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1. A blood pump, comprising:
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a pump housing having a blood flow path therethrough; a first stator mounted to said pump housing, said first stator having a first stator field winding for producing a first stator magnetic field; a first rotor mounted within said pump housing for rotation about a longitudinal axis of said first rotor in response to said first stator magnetic field, said first rotor carrying a blade thereon for propelling blood through said pump housing along said blood flow path, at least a portion of said blade being affixed to said rotor at an angle that is offset with respect to said longitudinal axis; a plurality of magnets secured to said at least a portion of said blade affixed to said rotor at an angle that is offset with respect to said longitudinal axis, said plurality of magnets producing a first rotor magnetic field that passes through said first stator field winding during said rotation of said first rotor to induce a back emf within said first stator field winding; and back emf sensor circuitry connecting to said first stator field winding to sense said back emf produced during said rotation of said first rotor within said pump housing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A blood pump, comprising:
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a pump housing having a blood flow path therethrough; a stator disposed about a portion said pump housing and having a stator field winding for producing a stator magnetic field; a rotor mounted within said pump housing for rotation in response to said stator magnetic field; a plurality of impeller blades secured to said rotor and extending radially outwardly from said rotor, said plurality of impeller blades being operable for propelling blood along said blood flow path through said pump housing; and at least one magnet implanted in each of said plurality of impeller blades adjacent a radially peripheral edge of a respective impeller blade, said at least one magnet being responsive to said stator magnetic field for producing rotational movement of said rotor. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A blood pump, comprising:
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a pump housing having a blood flow path therethrough; a stator mounted to said pump housing, said stator having a stator field winding for producing a stator magnetic field; a rotor mounted within said pump housing for rotation in response to said stator magnetic field; an inducer portion of said rotor having a plurality of inducer blades equidistantly disposed about a circumference of said rotor, each of said plurality of inducer blades having a pitch which varies along their axial length; an impeller portion of said rotor, said impeller portion being axially adjacent said inducer portion of said rotor, said impeller portion of said rotor having a plurality of impeller blades equidistantly disposed about said circumference of said rotor; and at least one interconnecting blade segment which interconnects between at least one of said inducer blades and at least one of said impeller blades to form a single continuous blade through said inducer portion and said impeller portion of said rotor. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A method of manufacturing a rotary blood pump, comprising the following steps:
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providing a tubular metallic rotary pump housing; providing a rotor in said housing; providing a bearing for said rotor within said housing; and damping said rotor in position in said tubular metallic rotary pump housing with a damp external to said tubular metallic rotary pump housing to deform said tubular metallic rotary pump housing in the locus of said bearing. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41)
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42. A rotary blood pump, comprising:
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a pump housing having a blood flow path therethrough; a stator mounted to said pump homing, said stator having a stator field winding for producing a stator magnetic field; a rotor mounted within said pump housing for rotation in response to said stator magnetic field; a first rotor bearing for rotatably supporting said rotor within said pump housing, said first rotor bearing including a fixed bearing surface substantially fixed with respect to said housing, said fixed bearing surface receiving a rotating bearing surface that rotates with said rotor, said fixed bearing surface and said rotating beating surface defining a bearing engagement region therebetween, said bearing engagement region fluidly separating said blood flow path from a dosed bearing chamber adjacent said beating engagement region, said dosed beating chamber being sealed from said fluid flow path except along said beating engagement region, said beating chamber being filled with bio-compatible material to prevent blood flow from said blood flow path into said dosed chamber from between said fixed bearing surface and said rotating bearing surface. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49)
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Specification