Surgery – Truss – Perineal
Patent
1974-07-22
1976-04-13
Kamm, William E.
Surgery
Truss
Perineal
232585R, 128214F, 128DIG3, 128DIG12, 417 43, 417 44, A61M 103
Patent
active
039497348
ABSTRACT:
The system coordinates the speed of a blood pump, in an extracorporeal blood circuit for a patient, with the blood flow from the patient to pass the blood through a treatment device such as an oxygenator and then back to the patient. The blood from the patient flows through a bladder which actuates a transducer to control an integrator and current amplifier. The current amplifier charges a capacitor to the breakdown potential of a DIAC avalanche diode causing the diode to fire and dump the charge of the capacitor into a silicon controlled rectifier which energizes the pump motor. The speed of the motor depends on the charging time of the capacitor in response to a signal voltage from the transducer. The motor is stopped by a comparator and flip flop when the blood flow through the bladder drops to a predetermined low value. The speed of the motor may also be controlled manually by a potentiometer.
REFERENCES:
patent: 3334285 (1967-08-01), Blake
patent: 3465746 (1969-09-01), Guarino
patent: 3478532 (1969-11-01), Cootey et al.
patent: 3572979 (1971-03-01), Morton
patent: 3756234 (1973-09-01), Kopp
patent: 3799702 (1974-03-01), Weishaar
patent: 3833013 (1974-09-01), Leonard
patent: 3841157 (1974-10-01), Willock
Edwards Miles Lowell
Taatjes Eugene G.
Kamm William E.
Schermerhorn Lee R.
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