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US 2026/0276580 A1Published application
ISFET Biosensor
AssigneeTexas Instruments Incorporated
InventorSebastian Meier
Life of this patent
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Abstract
A method of operating a biosensor device that has a porous membrane with a test region that contains a test analyte is disclosed. The biosensor device includes a sensor die that has an ion sensing field effect transistor (ISFET) with an ion sensitive gate element located in an active sensor surface of the sensor die. The active sensor surface is in contact with the porous membrane test region. A controller is coupled to the ISFET and an interface module is coupled to the controller to provide a human readable test result.
Claims9
A method of operating a biosensor, the method comprising:
- diluting a sample of target molecules to form a sample liquid;
- depositing a drop of the sample liquid on a porous membrane of the biosensor;
- allowing the sample liquid to propagate through the porous membrane by capillary action;
- conjugating a reagent contained in the porous membrane with the target molecules to form conjugated target molecules;
- reacting the conjugated molecules with a test litigant in a test region of the porous membrane to produce a test pH level in the test region;
- reacting remaining conjugated molecules with a control litigant in a control region of the porous membrane to produce a control pH level in the control region;
- detecting an ion concentration in the test region using a first ion sensitive field effect transistor (ISFET), in which an ion sensitive element of the first ISFET is in contact with the test region of the porous membrane;
- and
- detecting an ion concentration in the control region using a second ISFET, in which an ion sensitive element of the second ISFET is in contact with the control region of the porous membrane.
6 more elements
Dependencies are inferred from the claim text.