US 5,049,141 AGranted

Programmable valve pump

AssigneeInfusaid, Inc.

InventorPeter Olive

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Abstract

An implantable valve accumulator pump for the delivery of medication is disclosed. The implantable pump comprises a drug reservoir maintained at constant pressure vapor. The medication metering assembly comprises a fixed volume accumulator positioned between a pair of valves. The valves alternately open and close to admit medication from the reservoir into the accumulator and to dispense a precise volume spike to an outlet catheter. In order to minimize dead volume and insure complete discharge, the accumulator employs a titanium diaphragm seated in one position by a recessed stop and in the discharge position by a spacer plate having a concentric groove pattern. The grooves are in fluid communication with the inlet and outlet. Also, a wide groove extending between inlet and outlet provides fluid communication between the grooves. The unit is externally programmed.

Claims28

Dependent claims

An implantable infusion apparatus comprising:

a housing containing,
a rechargeable constant pressure infusate reservoir,
an electronically controlled metering assembly receiving infusate from said reservoir, said metering assembly comprising a pair of normally closed valves and an accumulator positioned in fluid communication with each of said valves, said accumulator comprising an inlet and outlet, a chamber having a diaphragm and a spacer plate, said spacer plate having a series of concentric grooves in fluid communication with said inlet and outlet,
electronic means for controlling the operation of said valves, and
outlet means in fluid communication with said metering assembly to dispense infusate to a site in a living body, wherein when a first of said valves is open, infusate flows from said reservoir into said accumulator chamber and into said concentric grooves, and when the other valve is open and the first closes, infusate flows from said accumulator into said outlet, said accumulator storing and discharging predetermined volume spikes of infusate at a frequency determined by the cycling rate of said pair of valves.

2 more elements

An implantable infusion apparatus comprising:

a sealed housing having an inlet septum,
a rechargeable constant pressure infusate reservoir in said housing,
metering means in said housing receiving infusate from said reservoir, said metering means comprising first and second valves and a fixed volume accumulator positioned in fluid communication with each of said valves, said accumulator comprising an inlet and an outlet, a chamber, a diaphragm and spacer plate in said chamber, said spacer plate having a series of concentric grooves in fluid communication with said inlet and outlet,
electronic means in said housing for controlling the operation of said valves, such that when a first of said valves is open, infusate flows from said reservoir into said accumulator to fill said accumulator by deflection of said diaphragm and when the second valve is open and the first valve closes, infusate flows from said accumulator and, outlet means in fluid communication with said metering means to dispense infusate to a site in a living body, whereby infusate dispensed in a series of predetermined volume spikes, the frequency of said spikes determined by the cycling rate of said first and second valves.

1 more element

Dependencies are inferred from the claim text.