Rotary kinetic fluid motors or pumps – With control means responsive to non-cyclic condition... – By shaft speed or torque responsive means
Patent
1987-07-17
1988-11-01
Garrett, Robert E.
Rotary kinetic fluid motors or pumps
With control means responsive to non-cyclic condition...
By shaft speed or torque responsive means
415 17, 417 63, F01D 1702
Patent
active
047815256
ABSTRACT:
Blood flow rate in a motor driven centrifugal blood pump is measured indirectly and non-invasively by sensing a first parameter representative of pump RPM and a second parameter representative of motor torque. The blood flow rate is computed as a function of the first and second parameters. By measuring the second parameter in a zero flow condition while the motor is being driven at a known RPM, a viscosity calibration factor is determined which is used, together with the first and second parameters in the calculation of flow rate.
REFERENCES:
patent: 4005581 (1977-02-01), Aanstad
patent: 4496286 (1985-01-01), Gagnon
patent: 4502842 (1985-03-01), Currier et al.
patent: 4589822 (1986-05-01), Clausen et al.
patent: 4636144 (1987-01-01), Abe et al.
patent: 4687410 (1987-08-01), Cline et al.
Clausen Earl W.
Hubbard Lloyd C.
Garrett Robert E.
Hoke II Robert W.
Kwon John T.
Minnesota Mining and Manufacturing Company
Sell Donald M.
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