Liquid delivery device
First Claim
1. An apparatus for the generation of a gas for use in a gas driven pump, comprising:
- a first container that is adapted to be situated in fluid communication with the pump, said first container containing a first and a second chemical, said first and second chemicals being initially separated from one another by an openable barrier, and reactive upon contact to generate a gas, the apparatus further comprising a separator interposed between the first container and the pump for allowing the gas to be communicated from the first container to the pump while said first and second chemicals remain in said container.
8 Assignments
0 Petitions
Accused Products
Abstract
A liquid dispensing device and the method of dispensing liquid are disclosed. The device is uniquely suited to meet the requirements of hospitals and other institutions for long shelf life in inert condition and ready activation when needed. The device includes a hollow gas- and liquid-tight casing (preferably spherical or cylindrical), a flexible gas- and liquid-tight membrane disposed entirely across the casing interior dividing the interior into a propellant chamber and a liquid chamber; an outlet port from the liquid chamber; two mutually reactive chemicals in the propellant chamber but separated by a barrier; and a member to breach the barrier and permit the chemicals to come into contact; the two chemicals being reactive upon contact to form a propellant gas. The propellant gas thereupon expands against the membrane, moves the membrane to enlarge the propellant chamber, decrease the liquid chamber, and expel the contained liquid from the liquid chamber through the outlet port. The barrier may be breached in any convenient manner, as by breaking a frangible barrier or perforating a perforable one. Preferably at least one of the chemicals is in liquid form, and one is a Group I or II metal carbonate or bicarbonate while the other is an acid, acid anhydride or acid salt; the most preferred combination is sodium carbonate and citric acid.
229 Citations
14 Claims
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1. An apparatus for the generation of a gas for use in a gas driven pump, comprising:
a first container that is adapted to be situated in fluid communication with the pump, said first container containing a first and a second chemical, said first and second chemicals being initially separated from one another by an openable barrier, and reactive upon contact to generate a gas, the apparatus further comprising a separator interposed between the first container and the pump for allowing the gas to be communicated from the first container to the pump while said first and second chemicals remain in said container. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for the generation of a gas used to provide pressure to drive a liquid from a container, comprising:
a reactant container in fluid communication with a gas chamber, said reactant container and said gas chamber being separated by a gas permeable separator positioned therebetween, said reactant container containing a solid chemical and a liquid chemical, said solid and liquid chemicals being initially separated by a frangible barrier and reactive upon contact to generate a gas, said gas chamber adapted to apply pressure to said liquid in said container. - View Dependent Claims (10, 11)
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12. An apparatus for the generation of a gas used to provide pressure to drive a fluid from a container, comprising:
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a first chemical and a second chemical, said first and second chemicals being initially separated by a frangible barrier and reactive upon contact to generate a gas, and a gas permeable separator separating said chemicals from said container, which allows the gas to be communicated through said separator to apply pressure to the fluid in said container while preventing said first and second chemicals from crossing said gas permeable separator. - View Dependent Claims (13, 14)
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Specification