Fluid delivery apparatus
First Claim
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1. A device for expelling fluids at a controlled rate comprising:
- (a) a base having a width;
(b) a distendable membrane constructed of an elastic material which is fitted over said base to form a chamber having a fluid outlet and a height substantially less than said width of said base, said distendable membrane being distendable in a manner to establish internal stresses therewithin tending to return said membrane to a less distended configuration, whereby fluid will be urged to flow from said fluid outlet; and
(c) flow control means disposed internally of said chamber for controlling the rate of flow of fluid through said outlet, said flow control means comprising a thin permeable member superimposed over said base.
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Abstract
An apparatus for accurately infusing medicinal agents into an ambulatory patient at specific rates over extended periods of time. The apparatus is of a compact, low profile, laminate construction and includes an elastic distendable membrane, which, in cooperation with a thin planar base, defines a fluid chamber having a fluid outlet. Disposed within the fluid chamber is a thin fluid permeable member which precisely controls the rate of fluid flow through the fluid outlet.
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Citations
32 Claims
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1. A device for expelling fluids at a controlled rate comprising:
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(a) a base having a width; (b) a distendable membrane constructed of an elastic material which is fitted over said base to form a chamber having a fluid outlet and a height substantially less than said width of said base, said distendable membrane being distendable in a manner to establish internal stresses therewithin tending to return said membrane to a less distended configuration, whereby fluid will be urged to flow from said fluid outlet; and (c) flow control means disposed internally of said chamber for controlling the rate of flow of fluid through said outlet, said flow control means comprising a thin permeable member superimposed over said base. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device for use in infusing pharmaceutical fluids into an ambulatory patient at a controlled rate comprising;
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(a) a plate-like base having at least one fluid conduit formed therein, said fluid conduit terminating in a fluid outlet; (b) a distendable membrane constructed of an elastic material which is fitted over said base to define a chamber, said membrane being at least partially under tension, being distendable by liquid introduced into said chamber under pressure and having a tendency to return to a substantially non-deformed configuration; (c) at least one fluid flow control means disposed internally of said chamber for controlling the rate of flow of fluid toward said fluid conduit; (d) means disposed intermediate said distendable membrane and said fluid flow control means for creating an ullage within said chamber; and (e) infusion means connected to said fluid outlet for infusing fluid into the patient. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A device for use in infusing medicinal fluids into a patient at a controlled rate comprising:
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(a) a thin, generally planar base having a fluid conduit formed therein, said fluid conduit terminating in a fluid outlet; (b) means for forming a fluid chamber comprising a thin, generally planar distendable film member superimposed over said base, said member being distendable out of plane by liquid introduced into said fluid chamber under pressure to establish internal stresses in said member said stresses tending to return said member to a less distended configuration; (c) a thin, generally planar, permeable member of a size substantially corresponding to the size of said base disposed internally of said chamber for controlling the flow of fluid toward said fluid conduit in said base; (d) a distendable film member engaging element disposed within said chamber intermediate said permeable member and said distendable film member, said distendable film member engaging element comprising an upstanding protuberance provided with a fluid flow chamber in communication with said fluid conduit in said base; and (e) a hollow needle integrally formed with said base in operable communication with said fluid outlet. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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26. A device for expelling fluids at a controlled rate, comprising:
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(a) a base; (b) means for forming a fluid chamber comprising a distendable membrane constructed of an elastic material superimposed over said base; (c) flow control means disposed internally of said chamber for controlling the rate of flow of fluid through said outlet, said flow control means comprising a thin permeable member superimposed over said base; (d) distendable membrane engagement means, disposed intermediate said distendable membrane and said flow control means, for engagement with said distendable membrane; and (e) a cover superimposed over said base, said distendable membrane, said distendable membrane engagement means and said flow control means.
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27. A device for expelling fluids at a controlled rate, comprising:
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(a) a base having a width and first and second surfaces; (b) means for forming a fluid chamber comprising a distendable membrane constructed of an elastic material spanning said first surface of said base, said fluid chamber having a fluid outlet and being of a height substantially less than said width of said base, said distendable membrane being distendable in a manner to establish internal stresses therewithin tending to return said membrane to a less distended configuration whereby fluid will be urged to flow from said fluid outlet; and (c) flow control means disposed internally of said chamber for controlling the rate of flow of fluid through said fluid outlet. - View Dependent Claims (28, 29, 30)
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31. A device for expelling fluids at a controlled rate, comprising:
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(a) a plate-like base having first and second surfaces; (b) means for forming a fluid chamber having a fluid outlet comprising a sheet-like distendable membrane constructed of an elastic material spanning said first surface of said base, said distendable membrane being terminally bound to said first surface of said base and being distendable in a manner to establish internal stresses therewithin tending to return said membrane to a less distended configuration whereby fluid will be urged to flow from said fluid outlet; and (c) flow control means disposed internally of said chamber for controlling the rate of flow of fluid through said outlet. - View Dependent Claims (32)
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Specification