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US 6,527,699 B1Granted
Magnetic suspension blood pump
OwnerMichael P. Goldowskyinventor
Life of this patent
Estimating the term…
Abstract
This invention is a non-contact axial flow turbo blood pump for propelling blood, which is composed of a pump housing (24) that defines a pump axis, with inlet, outlet openings at opposite axial ends of the pump housing, a rotor unit (17) that defines a rotor axis, and opposing rotor axial ends. The pump magnetically suspends the rotor within the pump housing at the rotor axial ends so as to avoid causing physical contact between the housing to define fluid gaps between the rotor axial ends, and the magnetic suspension elements (13)(13′).
Claims44
A blood pump to propel blood therethrough, comprising:
- a pump housing defining a pump axis, and inlet and outlet openings at opposite axial ends of said pump housing;
- a rotor defining a rotor axis and opposing rotor axial ends;
- magnetic suspension means within said pump housing at said rotor axial ends for magnetically suspending said rotor without physically contacting said housing and defining fluid gaps between said rotor axial ends and said magnetic suspension means and substantially maintaining the radial stability of said rotor so that said rotor axis remains substantially coextensive with said pump axis during operation;
- control means for maintaining axial stability of said rotor so that said rotor may absorb eternally imposed axial loads and maintain said fluid gaps and axial separation between said rotor and said pump housing;
- impeller means on said rotor operative to draw blood into said inlet opening and expel the blood through said outlet opening with rotation of said rotor;
- drive means for rotating said rotor and impeller means thereby pumping blood;
- and
- blood washout means for continuously moving blood through said fluid gaps during rotation of said rotor to prevent formation of thrombus in said fluid gaps.
5 more elements
A blood pump as defined in claim 32, wherein said control means includes a “virtually zero power” (VZP) control feedback loop for axially stabilizing said rotor on the basis of the detected axial velocity of said rotor and coil current.
A blood pump to propel blood therethrough, comprising:
- a pump housing defining a pump axis, and inlet and outlet openings in said pump housing;
- a rotor defining a rotor axis and opposing rotor axial ends;
- suspension means within said pump housing at said rotor axial ends for suspending said rotor for rotation within said housing and defining fluid gaps between said rotor axial ends and said suspension means and substantially maintaining the radial stability of said rotor so that said rotor axis remains substantially coextensive with said pump axis during operation;
- control means for maintaining axial stability of said rotor so that said rotor may absorb externally imposed axial loads and maintain said fluid gaps and axial separation between said rotor and said pump housing;
- impeller means on said rotor operative to draw blood into said inlet opening and expel the blood through said outlet opening with rotation of said rotor;
- drive means for rotating said rotor and impeller means thereby pumping blood;
- and
- blood washout means for continuously actively moving blood through said fluid gaps during rotation of said rotor to prevent formation of thrombus in said fluid gaps.
5 more elements
A blood pump to propel blood therethrough, comprising:
- a pump housing defining a pump axis, and inlet and outlet openings in said pump housing;
- a rotor defining a rotor axis and opposing rotor axial ends;
- suspension means within said pump housing at said rotor axial ends for suspending said rotor for rotation within said housing and defining fluid gaps between said rotor axial ends and said suspension means and substantially maintaining the radial stability of said rotor so that said rotor axis remains substantially coextensive with said pump axis during operation;
- permanent magnet means for establishing strong axial fields across said fluid gaps to provide radial stiffness and stability of said rotor during operation of the pump;
- control means for maintaining axial stability of said rotor so that said rotor may absorb externally imposed axial loads and maintain said fluid gaps and axial separation between said rotor and said pump housing;
- impeller means on said rotor operative to draw blood into said inlet opening and expel the blood through said outlet opening with rotation of said rotor;
- drive means for rotating said rotor and impeller means thereby pumping blood;
- and
- blood washout means for continuously moving blood through said fluid gaps during rotation of said rotor to prevent formation of thrombus in said fluid gaps.
6 more elements
A blood pump to propel blood therethrough, comprising:
- a pump housing defining a pump axis, and inlet and outlet openings in said pump housing;
- a rotor defining a rotor axis and opposing rotor axial ends;
- suspension means within said pump housing at said rotor axial ends for suspending said rotor for rotation within said housing and defining fluid gaps between said rotor axial ends and said suspension means and substantially maintaining the radial stability of said rotor so that said rotor axis remains substantially coextensive with said pump axis during operation;
- control means for maintaining axial stability of said rotor so that said rotor may absorb externally imposed axial loads and maintain said fluid gaps and axial separation between said rotor and said pump housing;
- impeller means on said rotor operative to draw blood into said inlet opening and expel the blood through said outlet opening with rotation of said rotor;
- drive means for rotating said rotor and impeller means thereby pumping blood;
- and
- blood washout means for continuously moving blood through said fluid gaps during rotation of said rotor to prevent formation of thrombus in said fluid gaps, said rotor means comprising a generally cylindrical rotor housing having a cylindrical wall defining an axis coextensive with said rotor axis and an outer cylindrical surface forming, with said pump housing, an annular passageway for the blood in moving from said inlet to said outlet openings, and said impeller means comprises a plurality of axially directed helical blades mounted on at least an axial length of said outer cylindrical surface, said blades being substantially equally angularly spaced from each other about said rotor axis and said helical blades having a pitch and a length to at least partially circumferentially as viewed along said rotor axis to minimize back leakage.
5 more elements
A blood pump to propel blood therethrough, comprising:
- a pump housing defining a pump axis, and inlet and outlet openings in said pump housing;
- a rotor defining a rotor axis and opposing rotor axial ends;
- suspension means within said pump housing at said rotor axial ends for magnetically suspending said rotor for rotation within said housing and defining fluid gaps between said rotor axial ends and said suspension means and substantially maintaining the radial stability of said rotor so that said rotor axis remains substantially coextensive with said pump axis during operation;
- control means for maintaining axial stability of said rotor so that said rotor may absorb externally imposed axial loads and maintain said fluid gaps and axial separation between said rotor and said pump housing;
- impeller means on said rotor operative to draw blood into said inlet opening and expel the blood through said outlet opening with rotation of said rotor;
- drive means for rotating said rotor and impeller means thereby pumping blood;
- and
- blood washout means for continuously moving blood through said fluid gaps during rotation of said rotor to prevent formation of thrombus in said fluid gaps, said pump housings and impeller means being arranged to provide axial flow 0f blood, and further comprising tangential-to axial flow redirection means for redirecting the tangential flow of blood resulting from rotation of said impeller means to axial flow at said outlet end to eliminate flow separation turbulence at said outlet end.
5 more elements
A blood pump to propel blood therethrough, comprising:
- a pump housing defining a pump axis, and inlet and outlet openings in of said pump housing;
- a rotor defining a rotor axis and opposing rotor axial ends;
- suspension means with in said pump housing at said rotor axial ends for suspending said rotor for rotation within said housing and defining fluid gaps between said rotor axial ends and said suspension means and substantially maintaining the radial stability of said rotor so that said rotor axis remains substantial coextensive with said pump axis during operation;
- control means for maintaining axial stability of said rotor so that said rotor may absorb externally imposed axial loads and maintain said fluid gaps and axial separation between said rotor and said pump housing;
- impeller means on said rotor operative to draw blood into said inlet opening and expel the blood through said outlet opening with rotation of said rotor;
- drive means for rotating said rotor and impeller means thereby pumping blood;
- and
- blood washout means for continuously moving blood through said fluid gaps during rotation of said rotor to prevent formation of thrombus in said fluid gaps, said control means including arranged to detect variations in axial velocity of said rotor, and means for establishing differential pressure acting on said rotor on the basis of said velocity variations to provide physiological control of the pump responsive to a patient's heart rate, which is generally proportional to average differential pressures between systolic and diastolic blood pressures.
5 more elements
Dependencies are inferred from the claim text.