专利名称：Liquid delivery device
发明人：Gregory E. Sancoff,Mark C. Doyle申请号：US08/372818申请日：19941223公开号：US05553741A公开日：19960910
摘要：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 institutionsfor long shelf life in inert-condition and ready activation when needed. The deviceincludes a hollow gas- and liquid-tight casing (preferably spherical or cylindrical), aflexible gas- and liquid-tight membrane disposed entirely across the casing interiordividing the interior into a propellant chamber and a liquid chamber; an outlet port fromthe liquid chamber; two mutually reactive chemicals in the propellant chamber butseparated by a barrier; and a member to breach the barrier and permit the chemicals tocome into contact; the two chemicals being reactive upon contact to form a propellantgas. The propellant gas thereupon expands against the membrane, moves the membraneto enlarge the propellant chamber, decrease the liquid chamber, and expel the containedliquid from the liquid chamber through the outlet port. The barrier may be breached inany convenient manner, as by breaking a frangible barrier or perforating a perforableone. Preferably at least one of the chemicals is in liquid form, and one is a Group I or IImetal carbonate or bicarbonate while the other is an acid, acid anhydride or acid salt; themost preferred combination is sodium carbonate and citric acid.
申请人：RIVER MEDICAL, INC.
代理机构：Knobbe, Martens, Olson & Bear
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