Liquid delivery device
First Claim
Patent Images
1. A device for the controlled delivery of a fluid, comprising:
- a hollow casing which comprises a pair of fluid impermeable shells which are sealingly joined together along a seal line to form said casing, said casing having an interior;
a flexible fluid impermeable membrane having a peripheral edge portion and at least one convolution providing for expansion and contraction of the membrane, said membrane disposed within said interior and separating a liquid chamber from a propellant chamber; and
an outlet port in said casing providing fluid communication between said liquid chamber and the exterior of said casing.
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Abstract
A liquid dispensing device and the method of dispensing liquid are disclosed. The device includes a hollow gas- and liquid-tight casing, a flexible gas- and liquid-tight membrane having multiple convolutions disposed across the casing interior and dividing the interior into a propellant chamber and a liquid chamber, an outlet port from the liquid chamber. A pressure relief valve, suitable for use with the device, allows gas to escape from the device when the gas pressure exceeds a predetermined level.
128 Citations
7 Claims
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1. A device for the controlled delivery of a fluid, comprising:
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a hollow casing which comprises a pair of fluid impermeable shells which are sealingly joined together along a seal line to form said casing, said casing having an interior; a flexible fluid impermeable membrane having a peripheral edge portion and at least one convolution providing for expansion and contraction of the membrane, said membrane disposed within said interior and separating a liquid chamber from a propellant chamber; and an outlet port in said casing providing fluid communication between said liquid chamber and the exterior of said casing. - View Dependent Claims (2)
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3. A device for the controlled delivery of a fluid, comprising:
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a hollow casing which comprises a pair of fluid impermeable shells which are sealingly joined together along a seal line to form said casing, said casing having an interior and an exterior; a flexible fluid impermeable membrane having a peripheral edge portion, said membrane disposed within said interior and separating a liquid chamber from a propellant chamber; and an outlet port in said casing providing fluid communication between said liquid chamber and the exterior of said casing; first and second chemicals separately disposed in said device, said first and second chemicals reactive with each other and disposed such that upon contact said first and second chemicals are in communication with said propellant chamber and react to generate a quantity of propellant gas at a controlled rate, thereby pressurizing said liquid chamber to deliver liquid through said outlet port; an openable barrier initially separating said first and second chemicals; and a relief valve in fluid communication with said propellant chamber. - View Dependent Claims (4, 5, 6, 7)
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Specification