Blood pump actuator

Details Blood pump actuator Blood pump actuator

1991-11-06

1994-11-01

Kruter, Jerome L.

Prosthesis (i.e., artificial body members), parts thereof, or ai

Corporeal artificial heart, heart assist , control...

600 16, A61M 110, A61N 1362

Patent

active

053604458

ABSTRACT:
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.

REFERENCES:
patent: 5064353 (1991-11-01), Tsukahara
Designers in Action, Machine Design, Feb. 24, 1983 Cyrogenic Cooler is Almost Friction Free.
A Permanent Magnet Linear Oscillatory Motor For the Total Artificial Heart, Cheng-Huan Yang and Syed A. Nasar (U. of Kentucky).
IEEE Transactions on Biomedical Engineering, vol. BME-33, No. 3, Mar. 3, 1986-A Tubular Self-Synchronous Motor for Artificial Heart Pump.
IEEE Transactions on Biomedical Engineering, vol. 37, No. 10, Oct. 1990-On-Line Pressure Estimation for a Left Heart Assist Device.
Ferrofluidics the fluid solution (Company brochure) Apr. 1981.

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