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US 5,334,197 AGranted
Flexible base fluid delivery apparatus
AssigneeScience Incorporated
InventorsMarshall S. Kriesel, Thomas N. Thompson, Farhad Kazemzadeh
Life of this patent
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Abstract
An apparatus for the precise, ambulatory infusion of pharmaceutical fluids to a patient at controlled rates over extended periods of time of a character in which an elastic membrane cooperates with a thin, yieldably-deformable base to form a fluid chamber. When the base is deformed from a first configuration to a second configuration, internal stesses are formed within the membrane which causes it to tend to return toward its starting configuration and, in so doing, force fluid contained within the fluid chamber outwardly of the device through a fluid port.
Claims19
A device for expelling fluids at a controlled rate, comprising:
- (a) a yieldably deformable solid base having first and second surfaces, said solid base being deformable from a first position wherein said first surface is in a first configuration to a second position wherein said first surface is in a second configuration;
- (b) means for forming a fluid chamber comprising a distendable membrane having a first surface and being constructed of an elastic material, said first surface of said membrane being disposed in a first position relative said first surface of said solid base when said base is in said first position and being disposed in a second position relative said first surface of said solid base when said base is in said second position to form a fluid chamber between said first surface of said solid base and said first surface of said membrane said fluid chamber having a fluid port, said distendable membrane being distendable when said solid base is in said second position in a manner to establish internal stresses therewithin tending to return said membrane to a less distended configuration whereby fluid within said chamber will be urged to flow from said fluid port;
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- (c) means removably connected to said solid base for maintaining said base in said first position.
1 more element
A device for expelling fluids at a controlled rate, comprising:
- (a) a yieldably deformable base having first and second surfaces, said base being deformable from a first position wherein said first surface is in a first generally concave configuration to a second position wherein said first surface is in a second generally convex configuration;
- and
- (b) means for forming a fluid chamber comprising a distendable membrane having a first surface and being constructed of an elastic material, said first surface of said membrane being disposed in a first position relative said first surface of said base when said base is in said first position and being moved into a second position relative said first surface of said base when said base is in said second position to form a fluid chamber between said first surface of said base and said first surface of said membrane, said fluid chamber having a fluid port, said distendable membrane being distendable when said base is in said second position in a manner to establish internal stresses therewithin tending to return said membrane to a less distended configuration whereby fluid within said chamber will be urged to flow from said fluid port.
A device for expelling fluids at a controlled rate, comprising:
- (a) a yieldably deformable base having first and second surfaces, said base being deformable from a first position wherein said first surface is a first configuration to a second position wherein said first surface is in a second configuration;
- (b) means for forming a fluid chamber comprising a distendable membrane having a central portion and marginal portions circumscribing said central portion, said marginal portions of said membrane being connected to said first surface of said base with said central portion of said membrane being disposed in a first position relative said first surface of said base when said base is in said first position and being moved into a second position relative said first surface of said base when said base is deformed into said second position to form a fluid chamber between said first surface of said base and said central portion of said membrane, said chamber having a fluid port, said distendable membrane being substantially unstressed when said base is in said first position and being internally stressed when said base is in said second position in a manner tending to return said membrane to its substantially unstressed condition, whereby fluid within said chamber will be urged to flow from said fluid port.
Dependencies are inferred from the claim text.