Liquid transport device containing means for delaying capillary flow
First Claim
1. In a liquid testing device comprising(a) two opposing surfaces which are spaced apart a distance effective to induce capillary flow of introduced liquid and to create a void zone of intended liquid transport, said zone comprising at least two distinct regions, at least one of which is a liquid analysis region, and(b) means permitting introduction of liquid into said zone for capillary transport to said regions,the improvement comprising gating means located between said two distinct regions for delaying capillary transport of liquid through said zone from one of said regions to other of said regions, said gating means including a gating wall extending across the intended path of liquid flowing from one of said regions to the other so as to delay liquid flow along said path, said wall including a gating aperture therein that is free of fibers.
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Accused Products
Abstract
A liquid transport device is disclosed for providing capillary flow. The device features a capillary transport zone provided by two opposed surfaces and having at least two regions, and means extending between said regions for delaying flow of liquid therebetween.
88 Citations
19 Claims
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1. In a liquid testing device comprising
(a) two opposing surfaces which are spaced apart a distance effective to induce capillary flow of introduced liquid and to create a void zone of intended liquid transport, said zone comprising at least two distinct regions, at least one of which is a liquid analysis region, and (b) means permitting introduction of liquid into said zone for capillary transport to said regions, the improvement comprising gating means located between said two distinct regions for delaying capillary transport of liquid through said zone from one of said regions to other of said regions, said gating means including a gating wall extending across the intended path of liquid flowing from one of said regions to the other so as to delay liquid flow along said path, said wall including a gating aperture therein that is free of fibers.
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2. In a liquid testing device comprising
(a) two opposing surfaces which are spaced apart a distance effective to induce capillary flow of introduced liquid and to create a void zone of intended liquid transport, said zone comprising at least two distinct regions at least one of which is a liquid analysis region, (b) an ion-selective electrode fluidly connected to said one liquid analysis region, and (c) means permitting introduction of liquid into said zone for capillary transport to said regions, the improvement comprising gating means located between said two distinct regions for delaying capillary transport of liquid through said zone from one of said regions to other of said regions.
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7. In a liquid transport device for controlled liquid flow, the device including two opposing liquid transport surfaces, means spacing said surfaces apart a distance effective to induce capillary flow of introduced liquid and to define a transport zone, and means permitting introduction of liquids into said zone at two spaced-apart locations;
- the improvement comprising;
a pair of gating means disposed to intercept liquid flow in said zone between said locations, each of said gating means including gating aperture means sized to allow liquid flow to continue at a restricted rate. - View Dependent Claims (8, 9)
- the improvement comprising;
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10. In a device for determining activity of an ionic analyte of an aqueous solution, said device including a pair of solid electrodes each constructed to develop therein an electric potential that is proportional in magnitude to the amount of analyte activity present in a contacting drop of said solution;
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and flow control means for directing liquid flow from a drop of an aqueous solution to at least one of said electrodes, said control means including (a) a member bridging and contacting said two electrodes and comprising two opposed liquid transport surfaces and means spacing apart said surfaces a distance effective to induce capillary flow of introduced liquid between said surfaces and to form with said surfaces a transport zone having a predetermined width and length, and (b) means permitting introduction of liquids into said zone at two spaced-apart locations; the improvement wherein said spacing means includes gating means intermediate said locations and extending between said surfaces across a major portion of said zone, for delaying flow of liquid within said zone between said locations, said gating means including gating aperture means sized to provide restricted liquid flow between said two locations. - View Dependent Claims (11, 12)
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13. In a device for determining activity of an ionic analyte of an aqueous solution, said device including a pair of solid electrodes each constructed to develop therein an electrical potential that is proportional in magnitude to the amount of analyte activity present in a contacting drop of said solution;
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and flow control means for directing liquid flow from a drop of an aqueous solution to at least one of said electrodes, said control means including (a) a member bridging said two electrodes and comprising two opposed liquid transport surfaces spaced apart a distance effective to induce capillary flow of introduced liquid between said surfaces and to form with said surfaces a transport zone, and (b) means permitting introduction of liquids into said zone at two spaced-apart locations;
the improvement comprising;gating means disposed to intercept liquid flow in said zone between said locations, for delaying liquid flow through said zone, said gating means including gating aperture means sized to allow liquid flow to continue at a restricted rate between said two locations. - View Dependent Claims (14, 15)
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16. In a device for determining activity of an ionic analyte of an aqueous solution, said device including a pair of solid electrodes each constructed to develop therein an electrical potential that is proportional in magnitude to the amount of analyte activity present in a contacting drop of said solution;
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and flow control means for directing liquid flow from a drop of an aqueous solution to at least one of said electrodes, said control means including (a) a member bridging said two electrodes and comprising two opposed liquid transport surfaces spaced apart a distance effective to induce capillary flow of introduced liquid between said surfaces and to form with said surfaces a transport zone, and (b) means permitting introduction of liquids into said zone at two spaced-apart locations;
the improvement comprising;a pair of gating means disposed across the path of liquid flow in said zone between said two locations for delaying liquid flow through said zone, each of said gating means including gating aperture means sized to allow liquid flow to continue at a restricted rate between said locations. - View Dependent Claims (17, 18, 19)
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Specification