Pumps – Motor driven – Fluid motor
Patent
1978-09-05
1981-05-05
Smith, Leonard E.
Pumps
Motor driven
Fluid motor
417297, 417384, 417395, 92 97, F04B 4306
Patent
active
042656001
ABSTRACT:
A pump for transferring precise amounts of fluid from a container to a patient. A pump apparatus has a defined volume pump chamber divided by a diaphragm into a pumping fluid portion and a pumped fluid portion. The pumped fluid portion receives and exhausts pumped fluid in response to a decrease or increase in pressure in the pumping fluid portion of the pump chamber. The diaphragm and the defined volume pumping chamber provide accurate per cycle pumping volumes. The pumping fluid pressure is varied by periodically electrically heating a ribbon filament in a pumping fluid chamber thereby increasing the temperature and therefore the pressure and/or volume of the pumping fluid. The pumped fluid enters the pumping chamber through a one-way valve as the pumped fluid portion volume expands and is exhausted through a second one-way valve as the volume of the pumped fluid portion contracts. Control circuitry is provided to allow variations in the pulse repetition rate and pulsewidth. A feedback control loop may also be provided by sensing, for example, the fluid flow rate, pressure, temperature or other dependent variable and generating an error signal therefrom.
REFERENCES:
patent: 2289617 (1942-07-01), Wood
patent: 2576282 (1951-11-01), Chambers
patent: 2957422 (1960-10-01), Loeber
patent: 3036525 (1962-05-01), Schulze et al.
patent: 3045874 (1962-07-01), Kogan et al.
patent: 3064631 (1962-11-01), Schwander
patent: 3101058 (1963-08-01), Carr, Jr. et al.
patent: 3232524 (1966-02-01), Rice et al.
patent: 3387566 (1968-06-01), Temple
patent: 3762838 (1973-10-01), Sato
patent: 3947156 (1976-03-01), Becker
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