Pressure pumping and priming pump apparatus

Details Pressure pumping and priming pump apparatus Pressure pumping and priming pump apparatus

1981-09-08

1983-07-12

Smith, Leonard E.

Pumps

Motor driven

Fluid motor

417458, 417540, F04B 4310

Patent

active

043927912

ABSTRACT:
A pump apparatus for transferring precise amounts of fluid from a container to a patient has a defined volume pump chamber divided by a first diaphragm to define a first chamber and a second chamber. A pumped fluid enters the first chamber through a one-way valve as the first chamber volume increases and is exhausted through a second one-way valve as the first chamber volume decreases. A third one-way valve is coupled to the first and second one-way valves in such a way as to prevent the pumped fluid from flowing through the pump in response to a pressure head at the input or output ports. A priming chamber is divided by a second diaphragm to define first and second sections, respectively. A passageway extends between the first section and the passageway connecting the second and third one-way valves. The second section is coupled to either a pressure varying source to prime the pump by causing the diaphragm to move or to a passive pressure sink to effect damping and smoothing of the pumped fluid pressure at the output port. Control circuitry may be provided to vary the pulse repetition rate, the pulse width, or the pulse amplitude to control the pumping rate. A pressure transducer may be coupled to the second section to provide a feedback control signal to the control circuitry.

REFERENCES:
patent: 3250224 (1966-05-01), Phillips et al.
patent: 3898017 (1975-08-01), Mandroian
patent: 4265601 (1981-05-01), Mandroian

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