Microfabricated diffusion-based chemical sensor
First Claim
1. A channel cell system for detecting the presence of analyte particles in a sample stream also comprising larger particles comprising:
- a) a laminar flow channel;
b) at least two inlets in fluid connection with said laminar flow channel for respectively conducting into said laminar flow channel (1) an indicator stream and (2) said sample stream;
c) wherein said laminar flow channel has a width greater than about 20 microns, a depth sufficiently small to allow laminar flow of said streams and a length sufficient to allow particles of said analyte to diffuse into said indicator stream to the substantial exclusion of said larger particles in said sample stream to form a detection area;
d) an outlet for conducting said streams out of said laminar flow channel to form a single mixed stream.
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Accused Products
Abstract
A channel-cell system is provided for detecting the presence and/or measuring the presence of analyte particles in a sample stream comprising: a) a laminar flow channel; b) two inlets in fluid connection with the laminar flow channel for respectively conducting into the laminar flow channel (1) an indicator stream which may comprise an indicator substance which indicates the presence of the analyte particles by a detectable change in property when contacted with the analyte particles, and (2) the sample stream; c) wherein the laminar flow channel has a depth sufficiently small to allow laminar flow of the streams and a length sufficient to allow particles of the analyte to diffuse into the indicator stream to the substantial exclusion of the larger particles in the sample stream to form a detection area; and d) an outlet for conducting the streams out of the laminar flow channel to form a single mixed stream.
410 Citations
19 Claims
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1. A channel cell system for detecting the presence of analyte particles in a sample stream also comprising larger particles comprising:
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a) a laminar flow channel; b) at least two inlets in fluid connection with said laminar flow channel for respectively conducting into said laminar flow channel (1) an indicator stream and (2) said sample stream; c) wherein said laminar flow channel has a width greater than about 20 microns, a depth sufficiently small to allow laminar flow of said streams and a length sufficient to allow particles of said analyte to diffuse into said indicator stream to the substantial exclusion of said larger particles in said sample stream to form a detection area; d) an outlet for conducting said streams out of said laminar flow channel to form a single mixed stream. - View Dependent Claims (2, 3, 4)
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5. A channel cell system for detecting the presence of analyte particles in a sample stream also comprising larger particles comprising:
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a) a laminar flow channel; b) at least two inlet means in fluid connection with said laminar flow channel for respectively conducting into said laminar flow channel (1) an indicator stream and (2) said sample stream; c) wherein said laminar flow channel has a depth sufficiently small to allow laminar flow of said streams and a length sufficient to allow particles of said analyte to diffuse into said indicator stream to the substantial exclusion of said larger particles in said sample stream to form a detection area; and d) a v-groove channel in fluid connection with said laminar flow channel. - View Dependent Claims (6, 7, 8)
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9. A channel cell system for detecting the presence of analyte particles in a sample stream also comprising larger particles comprising:
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a) a laminar flow channel; b) at least two inlet means in fluid connection with said laminar flow channel for respectively conducting into said laminar flow channel (1) an indicator stream and (2) said sample stream; c) wherein said laminar flow channel has a depth sufficiently small to allow laminar flow of said streams and a length sufficient to allow particles of said analyte to diffuse into said indicator stream to the substantial exclusion of said larger particles in said sample stream to form a detection area; and d) a sheath flow module in fluid connection with said laminar flow channel. - View Dependent Claims (10)
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11. A channel cell system for detecting the presence of analyte particles in a sample stream also comprising larger particles comprising:
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a) a convoluted laminar flow channel; b) at least two inlet means in fluid connection with said laminar flow channel for respectively conducting into said laminar flow channel (1) an indicator stream and (2) said sample stream; c) wherein said laminar flow channel has a depth sufficiently small to allow laminar flow of said streams and a length sufficient to allow particles of said analyte to diffuse into said indicator stream to the substantial exclusion of said larger particles in said sample stream to form a detection area; d) outlet means for conducting said streams out of said laminar flow channel to form a single mixed stream. - View Dependent Claims (12, 13, 14, 15)
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16. A channel cell system for detecting the presence of analyte particles in a sample stream also comprising larger particles comprising:
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a) a laminar flow channel; b) at least two inlets in fluid connection with said laminar flow channel for respectively conducting into said laminar flow channel (1) an indicator stream and (2) said sample stream; c) wherein said laminar flow channel has a width greater than about 20 microns, a depth sufficiently small to allow laminar flow of said streams and a length sufficient to allow particles of said analyte to diffuse into said indicator stream to the substantial exclusion of said larger particles in said sample stream to form a detection area; d) an outlet for conducting said streams out of said laminar flow channel to form a single mixed stream; and e) an optical analyte detection area. - View Dependent Claims (17)
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18. A channel cell system formed in a substrate plate for detecting by transmission the presence of analyte particles in a sample stream also comprising larger particles comprising:
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a) a laminar flow channel; b) at least two inlet means in fluid connection with said laminar flow channel for respectively conducting into said laminar flow channel (1) an indicator stream and (2) said sample stream; c) wherein said laminar flow channel has a depth sufficiently small to allow laminar flow of said streams and a length sufficient to allow particles of said analyte to diffuse into said indicator stream to the substantial exclusion of said larger particles in said sample stream to form a detection area; d) outlet means for conducting said streams out of said laminar flow channel to form a single mixed stream; e) at least one analyte detection area between said inlet means and said outlet means; f) optically transparent plates sealed to both sides of said substrate plate; and g) wherein said analyte detection area lies between said transparent plates in a space cut through the width of said substrate plate. - View Dependent Claims (19)
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Specification