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US 5,360,445 AGranted
Blood pump actuator
AssigneeInternational Business Machines Corporation
InventorMichael Goldowsky
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AssigneeInternational Business Machines Corporation
InventorMichael Goldowsky
Estimating the term…
An implantable blood pump actuator uses an efficient direct drive voice coil linear motor to power an hydraulic piston. The motor is immersed in oil and has but one moving part, a magnet which is attached to the piston. The piston is supported using a linear double acting hydrodynamic oil bearing that eliminates all wear and will potentially give an infinitely long life. There are no flexing leads, springs to break or parts to fatigue. A total artificial heart embodiment is very light, small, and as efficient as present prosthesis. The motor uses two commutated coils for high efficiency and has inherently low side forces due to the use of coils on both the inside and outside diameters of the magnet. The motor is cooled by forced convection of oil from the piston motion and by direct immersion of the coils in the oil. The highly effective cooling results in a smaller lighter weight motor.
A blood pump for use with a ventricle which receives blood, comprising a direct drive actuator for positioning proximate said ventricle, a magnet positioned inside said actuator, a stationary coil means circumferentially surrounding said magnet and spaced therefrom sufficiently so that wear and contact are minimized, a piston means attached to said magnet for pumping said ventricle, a bearing for supporting said piston means, a housing for said actuator filled with hydraulic fluid for providing cooling for said actuator, said piston means having a generally cylindrical surface having two sets of opposed taper means, a first of said sets being separated from a second of said sets by a groove, and communication means for receiving hydraulic fluid in said groove, whereby contact between said piston means and said housing is substantially eliminated.
A blood pump for use with a ventricle which receives blood, comprising a direct drive actuator for positioning proximate said ventricle, a magnet positioned inside said actuator, a stationary coil means circumferentially surrounding said magnet and spaced therefrom sufficiently so that wear and contact are minimized, a piston means attached to said magnet for pumping said ventricle, a bearing for supporting said piston means, a housing for said actuator filled with hydraulic fluid for providing cooling for said actuator, said piston means having a generally cylindrical surface having two sets of raised steps, with lands on each side thereof, to function as a bearing.
A blood pump for use with a ventricle which receives blood, comprising a direct drive actuator for positioning proximate said ventricle, a magnet positioned inside said actuator, a stationary coil means circumferentially surrounding said magnet and spaced therefrom sufficiently so that wear and contact are minimized, a piston means attached to said magnet for pumping said ventricle, a bearing for supporting said piston means, a housing for said actuator filled with hydraulic fluid for providing cooling for said actuator, ventricle sacks for said ventricle, said fluid being displaced by said piston means to alternately compress and expand said sacks, respectively located on each side of said piston means, and valve means for said sacks for controlling inflow and outflow of unidirectionally pumped blood, wherein said piston means defines a hydrodynamic bearing surface and a clearance seal, causing said fluid to be displaced on each side of said piston means.
A blood pump for pumping a ventricle which receives blood through an intake one-way valve and expels blood through an exhaust one-way valve, comprising:
Dependencies are inferred from the claim text.